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Initial commit: Go 1.23 release state

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Vorapol Rinsatitnon
2024-09-21 23:49:08 +10:00
commit 17cd57a668
13231 changed files with 3114330 additions and 0 deletions
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47
src/syscall/asm9_unix2_amd64.s Normal file
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build dragonfly || freebsd || netbsd
#include "textflag.h"
#include "funcdata.h"
//
// Syscall9 support for AMD64, DragonFly, FreeBSD and NetBSD
//
// func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64);
TEXT ·Syscall9(SB),NOSPLIT,$32-104
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ num+0(FP), AX // syscall entry
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
MOVQ a7+56(FP), R11
MOVQ a8+64(FP), R12
MOVQ a9+72(FP), R13
// only the first 6 arguments can be passed in registers,
// the last three should be placed at the top of the stack.
MOVQ R11, 8(SP) // arg 7
MOVQ R12, 16(SP) // arg 8
MOVQ R13, 24(SP) // arg 9
SYSCALL
JCC ok9
MOVQ $-1, r1+80(FP) // r1
MOVQ $0, r2+88(FP) // r2
MOVQ AX, err+96(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok9:
MOVQ AX, r1+80(FP) // r1
MOVQ DX, r2+88(FP) // r2
MOVQ $0, err+96(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET

21
src/syscall/asm_aix_ppc64.s Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for aix/ppc64 are implemented in ../runtime/syscall_aix.go
//
TEXT ·syscall6(SB),NOSPLIT,$0
JMP runtime·syscall_syscall6(SB)
TEXT ·rawSyscall6(SB),NOSPLIT,$0
JMP runtime·syscall_rawSyscall6(SB)
TEXT ·RawSyscall(SB),NOSPLIT,$0
JMP runtime·syscall_RawSyscall(SB)
TEXT ·Syscall(SB),NOSPLIT,$0
JMP runtime·syscall_Syscall(SB)

134
src/syscall/asm_darwin_amd64.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for AMD64, Darwin
//
// Trap # in AX, args in DI SI DX, return in AX DX
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno);
TEXT ·Syscall(SB),NOSPLIT,$0-56
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX
SYSCALL
JCC ok
MOVQ $-1, r1+32(FP)
MOVQ $0, r2+40(FP)
MOVQ AX, err+48(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVQ AX, r1+32(FP)
MOVQ DX, r2+40(FP)
MOVQ $0, err+48(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno);
TEXT ·Syscall6(SB),NOSPLIT,$0-80
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX
SYSCALL
JCC ok6
MOVQ $-1, r1+56(FP)
MOVQ $0, r2+64(FP)
MOVQ AX, err+72(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok6:
MOVQ AX, r1+56(FP)
MOVQ DX, r2+64(FP)
MOVQ $0, err+72(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), AX // syscall entry
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
MOVQ a7+56(FP), R11
MOVQ a8+64(FP), R12
MOVQ a9+72(FP), R13
SUBQ $32, SP
MOVQ R11, 8(SP)
MOVQ R12, 16(SP)
MOVQ R13, 24(SP)
ADDQ $0x2000000, AX
SYSCALL
JCC ok9
ADDQ $32, SP
MOVQ $-1, r1+80(FP)
MOVQ $0, r2+88(FP)
MOVQ AX, err+96(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok9:
ADDQ $32, SP
MOVQ AX, r1+80(FP)
MOVQ DX, r2+88(FP)
MOVQ $0, err+96(FP)
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX
SYSCALL
JCC ok1
MOVQ $-1, r1+32(FP)
MOVQ $0, r2+40(FP)
MOVQ AX, err+48(FP)
RET
ok1:
MOVQ AX, r1+32(FP)
MOVQ DX, r2+40(FP)
MOVQ $0, err+48(FP)
RET
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX
SYSCALL
JCC ok2
MOVQ $-1, r1+56(FP)
MOVQ $0, r2+64(FP)
MOVQ AX, err+72(FP)
RET
ok2:
MOVQ AX, r1+56(FP)
MOVQ DX, r2+64(FP)
MOVQ $0, err+72(FP)
RET

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src/syscall/asm_darwin_arm64.s Normal file
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for ARM64, Darwin
//
// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-56
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R16
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $0x80
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP) // r1
MOVD ZR, r2+40(FP) // r2
MOVD R0, err+48(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+32(FP) // r1
MOVD R1, r2+40(FP) // r2
MOVD ZR, err+48(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVD trap+0(FP), R16 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $0x80
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP) // r1
MOVD ZR, r2+40(FP) // r2
MOVD R0, err+48(FP) // err
RET
ok:
MOVD R0, r1+32(FP) // r1
MOVD R1, r2+40(FP) // r2
MOVD ZR, err+48(FP) // err
RET
// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R16 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $0x80
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP) // r1
MOVD ZR, r2+64(FP) // r2
MOVD R0, err+72(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+56(FP) // r1
MOVD R1, r2+64(FP) // r2
MOVD ZR, err+72(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVD trap+0(FP), R16 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $0x80
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP) // r1
MOVD ZR, r2+64(FP) // r2
MOVD R0, err+72(FP) // err
RET
ok:
MOVD R0, r1+56(FP) // r1
MOVD R1, r2+64(FP) // r2
MOVD ZR, R0
MOVD R0, err+72(FP) // err
RET
// Actually Syscall7
TEXT ·Syscall9(SB),NOSPLIT,$0-104
BL runtime·entersyscall<ABIInternal>(SB)
MOVD num+0(FP), R16 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
MOVD a7+56(FP), R6
//MOVD a8+64(FP), R7
//MOVD a9+72(FP), R8
SVC $0x80
BCC ok
MOVD $-1, R1
MOVD R1, r1+80(FP) // r1
MOVD ZR, r2+88(FP) // r2
MOVD R0, err+96(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+80(FP) // r1
MOVD R1, r2+88(FP) // r2
MOVD ZR, err+96(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET

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src/syscall/asm_freebsd_arm.s Normal file
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for ARM, FreeBSD
//
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, errno uintptr);
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr);
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, errno uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-28
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R7 // syscall number
MOVW a1+4(FP), R0 // a1
MOVW a2+8(FP), R1 // a2
MOVW a3+12(FP), R2 // a3
SWI $0 // syscall
MOVW $0, R2
BCS error
MOVW R0, r1+16(FP) // r1
MOVW R1, r2+20(FP) // r2
MOVW R2, err+24(FP) // errno
BL runtime·exitsyscall(SB)
RET
error:
MOVW $-1, R3
MOVW R3, r1+16(FP) // r1
MOVW R2, r2+20(FP) // r2
MOVW R0, err+24(FP) // errno
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-40
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R7 // syscall number
MOVW a1+4(FP), R0 // a1
MOVW a2+8(FP), R1 // a2
MOVW a3+12(FP), R2 // a3
MOVW a4+16(FP), R3 // a4
MOVW R13, R4
MOVW $a5+20(FP), R13 // a5 to a6 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS error6
MOVW R0, r1+28(FP) // r1
MOVW R1, r2+32(FP) // r2
MOVW R2, err+36(FP) // errno
BL runtime·exitsyscall(SB)
RET
error6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // r1
MOVW R2, r2+32(FP) // r2
MOVW R0, err+36(FP) // errno
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall9(SB),NOSPLIT,$0-52
BL runtime·entersyscall(SB)
MOVW num+0(FP), R7 // syscall number
MOVW a1+4(FP), R0 // a1
MOVW a2+8(FP), R1 // a2
MOVW a3+12(FP), R2 // a3
MOVW a4+16(FP), R3 // a4
MOVW R13, R4
MOVW $a5+20(FP), R13 // a5 to a9 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS error9
MOVW R0, r1+40(FP) // r1
MOVW R1, r2+44(FP) // r2
MOVW R2, err+48(FP) // errno
BL runtime·exitsyscall(SB)
RET
error9:
MOVW $-1, R3
MOVW R3, r1+40(FP) // r1
MOVW R2, r2+44(FP) // r2
MOVW R0, err+48(FP) // errno
BL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVW trap+0(FP), R7 // syscall number
MOVW a1+4(FP), R0 // a1
MOVW a2+8(FP), R1 // a2
MOVW a3+12(FP), R2 // a3
SWI $0 // syscall
MOVW $0, R2
BCS errorr
MOVW R0, r1+16(FP) // r1
MOVW R1, r2+20(FP) // r2
MOVW R2, err+24(FP) // errno
RET
errorr:
MOVW $-1, R3
MOVW R3, r1+16(FP) // r1
MOVW R2, r2+20(FP) // r2
MOVW R0, err+24(FP) // errno
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVW trap+0(FP), R7 // syscall number
MOVW a1+4(FP), R0 // a1
MOVW a2+8(FP), R1 // a2
MOVW a3+12(FP), R2 // a3
MOVW a4+16(FP), R3 // a4
MOVW R13, R4
MOVW $a5+20(FP), R13 // a5 to a6 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS errorr6
MOVW R0, r1+28(FP) // r1
MOVW R1, r2+32(FP) // r2
MOVW R2, err+36(FP) // errno
RET
errorr6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // r1
MOVW R2, r2+32(FP) // r2
MOVW R0, err+36(FP) // errno
RET

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src/syscall/asm_freebsd_arm64.s Normal file
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for ARM64, FreeBSD
//
#define SYS_syscall 0
// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-56
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R8 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP)
MOVD ZR, r2+40(FP)
MOVD R0, err+48(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+32(FP)
MOVD R1, r2+40(FP)
MOVD ZR, err+48(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVD trap+0(FP), R8 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP)
MOVD ZR, r2+40(FP)
MOVD R0, err+48(FP)
RET
ok:
MOVD R0, r1+32(FP)
MOVD R1, r2+40(FP)
MOVD ZR, err+48(FP)
RET
// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R8 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP)
MOVD ZR, r2+64(FP)
MOVD R0, err+72(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+56(FP)
MOVD R1, r2+64(FP)
MOVD ZR, err+72(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVD trap+0(FP), R8 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP)
MOVD ZR, r2+64(FP)
MOVD R0, err+72(FP)
RET
ok:
MOVD R0, r1+56(FP)
MOVD R1, r2+64(FP)
MOVD ZR, err+72(FP)
RET
// Actually Syscall7
// func Syscall9(num uintptr, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
BL runtime·entersyscall<ABIInternal>(SB)
MOVD num+0(FP), R8 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
MOVD a7+56(FP), R6
// MOVD a8+64(FP), R7
// MOVD a9+72(FP), R8
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+80(FP)
MOVD ZR, r2+88(FP)
MOVD R0, err+96(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+80(FP)
MOVD R1, r2+88(FP)
MOVD ZR, err+96(FP)
BL runtime·exitsyscall<ABIInternal>(SB)
RET

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src/syscall/asm_freebsd_riscv64.s Normal file
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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for riscv64, FreeBSD
//
// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64)
TEXT ·Syscall(SB),NOSPLIT,$0-56
CALL runtime·entersyscall(SB)
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), T0 // syscall entry
ECALL
BNE T0, ZERO, err
MOV A0, r1+32(FP) // r1
MOV A1, r2+40(FP) // r2
MOV ZERO, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
err:
MOV $-1, T0
MOV T0, r1+32(FP) // r1
MOV ZERO, r2+40(FP) // r2
MOV A0, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
CALL runtime·entersyscall(SB)
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV a4+32(FP), A3
MOV a5+40(FP), A4
MOV a6+48(FP), A5
MOV trap+0(FP), T0 // syscall entry
ECALL
BNE T0, ZERO, err
MOV A0, r1+56(FP) // r1
MOV A1, r2+64(FP) // r2
MOV ZERO, err+72(FP) // errno
CALL runtime·exitsyscall(SB)
RET
err:
MOV $-1, T0
MOV T0, r1+56(FP) // r1
MOV ZERO, r2+64(FP) // r2
MOV A0, err+72(FP) // errno
CALL runtime·exitsyscall(SB)
RET
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), T0 // syscall entry
ECALL
BNE T0, ZERO, err
MOV A0, r1+32(FP) // r1
MOV A1, r2+40(FP) // r2
MOV ZERO, err+48(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+32(FP) // r1
MOV ZERO, r2+40(FP) // r2
MOV A0, err+48(FP) // errno
RET
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV a4+32(FP), A3
MOV a5+40(FP), A4
MOV a6+48(FP), A5
MOV trap+0(FP), T0 // syscall entry
ECALL
BNE T0, ZERO, err
MOV A0, r1+56(FP) // r1
MOV A1, r2+64(FP) // r2
MOV ZERO, err+72(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+56(FP) // r1
MOV ZERO, r2+64(FP) // r2
MOV A0, err+72(FP) // errno
RET
// Actually Syscall7
// func Syscall9(num uintptr, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
CALL runtime·entersyscall(SB)
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV a4+32(FP), A3
MOV a5+40(FP), A4
MOV a6+48(FP), A5
MOV a7+56(FP), A6
MOV num+0(FP), T0 // syscall entry
ECALL
BNE T0, ZERO, err
MOV A0, r1+80(FP) // r1
MOV A1, r2+88(FP) // r2
MOV ZERO, err+96(FP) // errno
CALL runtime·exitsyscall(SB)
RET
err:
MOV $-1, T0
MOV T0, r1+80(FP) // r1
MOV ZERO, r2+88(FP) // r2
MOV A0, err+96(FP) // errno
CALL runtime·exitsyscall(SB)
RET

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System calls for 386, Linux
//
// See ../runtime/sys_linux_386.s for the reason why we always use int 0x80
// instead of the glibc-specific "CALL 0x10(GS)".
#define INVOKE_SYSCALL INT $0x80
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24
MOVL trap+0(FP), AX // syscall entry
MOVL a1+4(FP), BX
MOVL a2+8(FP), CX
MOVL a3+12(FP), DX
POPL SI // preserve return address
INVOKE_SYSCALL
PUSHL SI
CMPL AX, $0xfffff001
JLS ok
MOVL $-1, r1+16(FP)
NEGL AX
MOVL AX, err+20(FP)
RET
ok:
MOVL AX, r1+16(FP)
MOVL $0, err+20(FP)
RET
// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24
MOVL trap+0(FP), AX // syscall entry
MOVL a1+4(FP), BX
MOVL a2+8(FP), CX
MOVL a3+12(FP), DX
MOVL $0, SI
MOVL $0, DI
INVOKE_SYSCALL
MOVL AX, r1+16(FP)
MOVL DX, r2+20(FP)
RET
#define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */
// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
// Kernel interface gets call sub-number and pointer to a0.
TEXT ·socketcall(SB),NOSPLIT,$0-36
CALL runtime·entersyscall(SB)
MOVL $SYS_SOCKETCALL, AX // syscall entry
MOVL call+0(FP), BX // socket call number
LEAL a0+4(FP), CX // pointer to call arguments
MOVL $0, DX
MOVL $0, SI
MOVL $0, DI
INVOKE_SYSCALL
CMPL AX, $0xfffff001
JLS oksock
MOVL $-1, n+28(FP)
NEGL AX
MOVL AX, err+32(FP)
CALL runtime·exitsyscall(SB)
RET
oksock:
MOVL AX, n+28(FP)
MOVL $0, err+32(FP)
CALL runtime·exitsyscall(SB)
RET
// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
// Kernel interface gets call sub-number and pointer to a0.
TEXT ·rawsocketcall(SB),NOSPLIT,$0-36
MOVL $SYS_SOCKETCALL, AX // syscall entry
MOVL call+0(FP), BX // socket call number
LEAL a0+4(FP), CX // pointer to call arguments
MOVL $0, DX
MOVL $0, SI
MOVL $0, DI
INVOKE_SYSCALL
CMPL AX, $0xfffff001
JLS oksock1
MOVL $-1, n+28(FP)
NEGL AX
MOVL AX, err+32(FP)
RET
oksock1:
MOVL AX, n+28(FP)
MOVL $0, err+32(FP)
RET
#define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */
// func Seek(fd int, offset int64, whence int) (newoffset int64, err int)
// Implemented in assembly to avoid allocation when
// taking the address of the return value newoffset.
// Underlying system call is
// llseek(int fd, int offhi, int offlo, int64 *result, int whence)
TEXT ·seek(SB),NOSPLIT,$0-28
CALL runtime·entersyscall(SB)
MOVL $SYS__LLSEEK, AX // syscall entry
MOVL fd+0(FP), BX
MOVL offset_hi+8(FP), CX
MOVL offset_lo+4(FP), DX
LEAL newoffset_lo+16(FP), SI // result pointer
MOVL whence+12(FP), DI
INVOKE_SYSCALL
CMPL AX, $0xfffff001
JLS okseek
MOVL $-1, newoffset_lo+16(FP)
MOVL $-1, newoffset_hi+20(FP)
NEGL AX
MOVL AX, err+24(FP)
CALL runtime·exitsyscall(SB)
RET
okseek:
// system call filled in newoffset already
MOVL $0, err+24(FP)
CALL runtime·exitsyscall(SB)
RET

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System calls for AMD64, Linux
//
#define SYS_gettimeofday 96
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry
POPQ R12 // preserve return address
SYSCALL
PUSHQ R12
CMPQ AX, $0xfffffffffffff001
JLS ok2
MOVQ $-1, r1+32(FP)
NEGQ AX
MOVQ AX, err+40(FP)
RET
ok2:
MOVQ AX, r1+32(FP)
MOVQ $0, err+40(FP)
RET
// func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr)
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ trap+0(FP), AX // syscall entry
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ DX, r2+40(FP)
RET
// func gettimeofday(tv *Timeval) (err uintptr)
TEXT ·gettimeofday(SB),NOSPLIT,$0-16
MOVQ tv+0(FP), DI
MOVQ $0, SI
MOVQ runtime·vdsoGettimeofdaySym(SB), AX
TESTQ AX, AX
JZ fallback
CALL AX
ret:
CMPQ AX, $0xfffffffffffff001
JLS ok7
NEGQ AX
MOVQ AX, err+8(FP)
RET
fallback:
MOVL $SYS_gettimeofday, AX
SYSCALL
JMP ret
ok7:
MOVQ $0, err+8(FP)
RET

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System calls for arm, Linux
//
#define SYS__LLSEEK 140 /* from zsysnum_linux_arm.go */
// func seek(fd int, offset int64, whence int) (newoffset int64, errno int)
// Implemented in assembly to avoid allocation when
// taking the address of the return value newoffset.
// Underlying system call is
// llseek(int fd, int offhi, int offlo, int64 *result, int whence)
TEXT ·seek(SB),NOSPLIT,$0-28
BL runtime·entersyscall(SB)
MOVW $SYS__LLSEEK, R7 // syscall entry
MOVW fd+0(FP), R0
MOVW offset_hi+8(FP), R1
MOVW offset_lo+4(FP), R2
MOVW $newoffset_lo+16(FP), R3
MOVW whence+12(FP), R4
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
BLS okseek
MOVW $0, R1
MOVW R1, newoffset_lo+16(FP)
MOVW R1, newoffset_hi+20(FP)
RSB $0, R0, R0
MOVW R0, err+24(FP)
BL runtime·exitsyscall(SB)
RET
okseek:
// system call filled in newoffset already
MOVW $0, R0
MOVW R0, err+24(FP)
BL runtime·exitsyscall(SB)
RET
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24
MOVW trap+0(FP), R7 // syscall entry
MOVW a1+4(FP), R0
MOVW a2+8(FP), R1
MOVW a3+12(FP), R2
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
BLS ok
MOVW $-1, R1
MOVW R1, r1+16(FP)
RSB $0, R0, R0
MOVW R0, err+20(FP)
RET
ok:
MOVW R0, r1+16(FP)
MOVW $0, R0
MOVW R0, err+20(FP)
RET
// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24
MOVW trap+0(FP), R7 // syscall entry
MOVW a1+4(FP), R0
MOVW a2+8(FP), R1
MOVW a3+12(FP), R2
SWI $0
MOVW R0, r1+16(FP)
MOVW $0, R0
MOVW R0, r2+20(FP)
RET

41
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT,$0-48
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD $0, R3
MOVD $0, R4
MOVD $0, R5
MOVD trap+0(FP), R8 // syscall entry
SVC
CMN $4095, R0
BCC ok
MOVD $-1, R4
MOVD R4, r1+32(FP) // r1
NEG R0, R0
MOVD R0, err+40(FP) // errno
RET
ok:
MOVD R0, r1+32(FP) // r1
MOVD ZR, err+40(FP) // errno
RET
// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD $0, R3
MOVD $0, R4
MOVD $0, R5
MOVD trap+0(FP), R8 // syscall entry
SVC
MOVD R0, r1+32(FP)
MOVD R1, r2+40(FP)
RET

44
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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for loong64, Linux
//
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT,$0-48
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV $0, R7
MOVV $0, R8
MOVV $0, R9
MOVV trap+0(FP), R11 // syscall entry
SYSCALL
MOVW $-4096, R12
BGEU R12, R4, ok
MOVV $-1, R12
MOVV R12, r1+32(FP) // r1
SUBVU R4, R0, R4
MOVV R4, err+40(FP) // errno
RET
ok:
MOVV R4, r1+32(FP) // r1
MOVV R0, err+40(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV R0, R7
MOVV R0, R8
MOVV R0, R9
MOVV trap+0(FP), R11 // syscall entry
SYSCALL
MOVV R4, r1+32(FP)
MOVV R0, r2+40(FP) // r2 is not used. Always set to 0.
RET

45
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && (mips64 || mips64le)
#include "textflag.h"
//
// System calls for mips64, Linux
//
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV R0, R7
MOVV R0, R8
MOVV R0, R9
MOVV trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok
MOVV $-1, R1
MOVV R1, r1+32(FP) // r1
MOVV R2, err+40(FP) // errno
RET
ok:
MOVV R2, r1+32(FP) // r1
MOVV R0, err+40(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV R0, R7
MOVV R0, R8
MOVV R0, R9
MOVV trap+0(FP), R2 // syscall entry
MOVV R0, R3 // reset R3 to zero as 1-ret SYSCALL keeps it
SYSCALL
MOVV R2, r1+32(FP) // r1
MOVV R3, r2+40(FP) // r2
RET

74
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && (mips || mipsle)
#include "textflag.h"
#include "funcdata.h"
//
// System calls for mips, Linux
//
// func Syscall9(trap trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr);
// Actually Syscall8 but the rest of the code expects it to be named Syscall9.
TEXT ·Syscall9(SB),NOSPLIT,$28-52
NO_LOCAL_POINTERS
JAL runtime·entersyscall(SB)
MOVW a1+4(FP), R4
MOVW a2+8(FP), R5
MOVW a3+12(FP), R6
MOVW a4+16(FP), R7
MOVW a5+20(FP), R8
MOVW a6+24(FP), R9
MOVW a7+28(FP), R10
MOVW a8+32(FP), R11
MOVW R8, 16(R29)
MOVW R9, 20(R29)
MOVW R10, 24(R29)
MOVW R11, 28(R29)
MOVW trap+0(FP), R2 // syscall entry
MOVW R0, R3 // reset R3 to zero as 1-ret SYSCALL keeps it
SYSCALL
BEQ R7, ok9
MOVW $-1, R1
MOVW R1, r1+40(FP) // r1
MOVW R0, r2+44(FP) // r2
MOVW R2, err+48(FP) // errno
JAL runtime·exitsyscall(SB)
RET
ok9:
MOVW R2, r1+40(FP) // r1
MOVW R3, r2+44(FP) // r2
MOVW R0, err+48(FP) // errno
JAL runtime·exitsyscall(SB)
RET
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24
MOVW a1+4(FP), R4
MOVW a2+8(FP), R5
MOVW a3+12(FP), R6
MOVW trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok
MOVW $-1, R1
MOVW R1, r1+16(FP) // r1
MOVW R2, err+20(FP) // errno
RET
ok:
MOVW R2, r1+16(FP) // r1
MOVW R0, err+20(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$20-24
MOVW a1+4(FP), R4
MOVW a2+8(FP), R5
MOVW a3+12(FP), R6
MOVW trap+0(FP), R2 // syscall entry
MOVW R0, R3 // reset R3 to zero as 1-ret SYSCALL keeps it
SYSCALL
MOVW R2, r1+16(FP) // r1
MOVW R3, r2+20(FP) // r2
RET

44
src/syscall/asm_linux_ppc64x.s Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && (ppc64 || ppc64le)
#include "textflag.h"
//
// System calls for ppc64, Linux
//
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
MOVD a1+8(FP), R3
MOVD a2+16(FP), R4
MOVD a3+24(FP), R5
MOVD R0, R6
MOVD R0, R7
MOVD R0, R8
MOVD trap+0(FP), R9 // syscall entry
SYSCALL R9
BVC ok
MOVD $-1, R4
MOVD R4, r1+32(FP) // r1
MOVD R3, err+40(FP) // errno
RET
ok:
MOVD R3, r1+32(FP) // r1
MOVD R0, err+40(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVD a1+8(FP), R3
MOVD a2+16(FP), R4
MOVD a3+24(FP), R5
MOVD R0, R6
MOVD R0, R7
MOVD R0, R8
MOVD trap+0(FP), R9 // syscall entry
SYSCALL R9
MOVD R3, r1+32(FP)
MOVD R0, r2+40(FP)
RET

41
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for riscv64, Linux
//
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV ZERO, A3
MOV ZERO, A4
MOV ZERO, A5
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV $-4096, T0
BLTU T0, A0, err
MOV A0, r1+32(FP) // r1
MOV ZERO, err+40(FP) // errno
RET
err:
MOV $-1, T0
MOV T0, r1+32(FP) // r1
SUB A0, ZERO, A0
MOV A0, err+40(FP) // errno
RET
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOV a1+8(FP), A0
MOV a2+16(FP), A1
MOV a3+24(FP), A2
MOV trap+0(FP), A7 // syscall entry
ECALL
MOV A0, r1+32(FP)
MOV A1, r2+40(FP)
RET

93
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for s390x, Linux
//
// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
MOVD a1+8(FP), R2
MOVD a2+16(FP), R3
MOVD a3+24(FP), R4
MOVD $0, R5
MOVD $0, R6
MOVD $0, R7
MOVD trap+0(FP), R1 // syscall entry
SYSCALL
MOVD $0xfffffffffffff001, R8
CMPUBLT R2, R8, ok2
MOVD $-1, r1+32(FP)
NEG R2, R2
MOVD R2, err+40(FP) // errno
RET
ok2:
MOVD R2, r1+32(FP)
MOVD $0, err+40(FP) // errno
RET
// func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr)
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVD a1+8(FP), R2
MOVD a2+16(FP), R3
MOVD a3+24(FP), R4
MOVD $0, R5
MOVD $0, R6
MOVD $0, R7
MOVD trap+0(FP), R1 // syscall entry
SYSCALL
MOVD R2, r1+32(FP)
MOVD R3, r2+40(FP)
RET
#define SYS_SOCKETCALL 102 /* from zsysnum_linux_s390x.go */
// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
// Kernel interface gets call sub-number and pointer to a0.
TEXT ·socketcall(SB),NOSPLIT,$0-72
BL runtime·entersyscall(SB)
MOVD $SYS_SOCKETCALL, R1 // syscall entry
MOVD call+0(FP), R2 // socket call number
MOVD $a0+8(FP), R3 // pointer to call arguments
MOVD $0, R4
MOVD $0, R5
MOVD $0, R6
MOVD $0, R7
SYSCALL
MOVD $0xfffffffffffff001, R8
CMPUBLT R2, R8, oksock
MOVD $-1, n+56(FP)
NEG R2, R2
MOVD R2, err+64(FP)
BL runtime·exitsyscall(SB)
RET
oksock:
MOVD R2, n+56(FP)
MOVD $0, err+64(FP)
CALL runtime·exitsyscall(SB)
RET
// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
// Kernel interface gets call sub-number and pointer to a0.
TEXT ·rawsocketcall(SB),NOSPLIT,$0-72
MOVD $SYS_SOCKETCALL, R1 // syscall entry
MOVD call+0(FP), R2 // socket call number
MOVD $a0+8(FP), R3 // pointer to call arguments
MOVD $0, R4
MOVD $0, R5
MOVD $0, R6
MOVD $0, R7
SYSCALL
MOVD $0xfffffffffffff001, R8
CMPUBLT R2, R8, oksock1
MOVD $-1, n+56(FP)
NEG R2, R2
MOVD R2, err+64(FP)
RET
oksock1:
MOVD R2, n+56(FP)
MOVD $0, err+64(FP)
RET

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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for ARM, NetBSD
//
// func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
// func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
// func Syscall9(trap int32, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int32)
TEXT ·Syscall(SB),NOSPLIT,$0-28
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R0 // sigcall num
MOVW a1+4(FP), R1 // a1
MOVW a2+8(FP), R2 // a2
MOVW a3+12(FP), R3 // a3
SWI $0 // syscall
MOVW $0, R2
BCS error
MOVW R0, r1+16(FP) // r1
MOVW R1, r2+20(FP) // r2
MOVW R2, err+24(FP) // err
BL runtime·exitsyscall(SB)
RET
error:
MOVW $-1, R3
MOVW R3, r1+16(FP) // r1
MOVW R2, r2+20(FP) // r2
MOVW R0, err+24(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-40
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R0 // sigcall num
MOVW a1+4(FP), R1 // a1
MOVW a2+8(FP), R2 // a2
MOVW a3+12(FP), R3 // a3
MOVW R13, R4
MOVW $a4+16(FP), R13 // a4 to a6 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS error6
MOVW R0, r1+28(FP) // r1
MOVW R1, r2+32(FP) // r2
MOVW R2, err+36(FP) // err
BL runtime·exitsyscall(SB)
RET
error6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // r1
MOVW R2, r2+32(FP) // r2
MOVW R0, err+36(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall9(SB),NOSPLIT,$0-52
BL runtime·entersyscall(SB)
MOVW num+0(FP), R0 // sigcall num
MOVW a1+4(FP), R1 // a1
MOVW a2+8(FP), R2 // a2
MOVW a3+12(FP), R3 // a3
MOVW R13, R4
MOVW $a4+16(FP), R13 // a4 to a9 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS error9
MOVW R0, r1+40(FP) // r1
MOVW R1, r2+44(FP) // r2
MOVW R2, err+48(FP) // err
BL runtime·exitsyscall(SB)
RET
error9:
MOVW $-1, R3
MOVW R3, r1+40(FP) // r1
MOVW R2, r2+44(FP) // r2
MOVW R0, err+48(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVW trap+0(FP), R0 // sigcall num
MOVW a1+4(FP), R1 // a1
MOVW a2+8(FP), R2 // a2
MOVW a3+12(FP), R3 // a3
SWI $0 // syscall
MOVW $0, R2
BCS errorr
MOVW R0, r1+16(FP) // r1
MOVW R1, r2+20(FP) // r2
MOVW R2, err+24(FP) // err
RET
errorr:
MOVW $-1, R3
MOVW R3, r1+16(FP) // r1
MOVW R2, r2+20(FP) // r2
MOVW R0, err+24(FP) // err
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVW trap+0(FP), R0 // sigcall num
MOVW a1+4(FP), R1 // a1
MOVW a2+8(FP), R2 // a2
MOVW a3+12(FP), R3 // a3
MOVW R13, R4
MOVW $a4+16(FP), R13 // a4 to a9 are passed on stack
SWI $0 // syscall
MOVW R4, R13
MOVW $0, R2
BCS errorr6
MOVW R0, r1+28(FP) // r1
MOVW R1, r2+32(FP) // r2
MOVW R2, err+36(FP) // err
RET
errorr6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // r1
MOVW R2, r2+32(FP) // r2
MOVW R0, err+36(FP) // err
RET

128
src/syscall/asm_netbsd_arm64.s Normal file
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for ARM64, NetBSD
//
#define SYS_syscall 0
// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-56
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R17
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP) // r1
MOVD ZR, r2+40(FP) // r2
MOVD R0, err+48(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+32(FP) // r1
MOVD R1, r2+40(FP) // r2
MOVD ZR, err+48(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVD trap+0(FP), R17 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+32(FP) // r1
MOVD ZR, r2+40(FP) // r2
MOVD R0, err+48(FP) // err
RET
ok:
MOVD R0, r1+32(FP) // r1
MOVD R1, r2+40(FP) // r2
MOVD ZR, err+48(FP) // err
RET
// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
BL runtime·entersyscall<ABIInternal>(SB)
MOVD trap+0(FP), R17 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP) // r1
MOVD ZR, r2+64(FP) // r2
MOVD R0, err+72(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+56(FP) // r1
MOVD R1, r2+64(FP) // r2
MOVD ZR, err+72(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVD trap+0(FP), R17 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+56(FP) // r1
MOVD ZR, r2+64(FP) // r2
MOVD R0, err+72(FP) // err
RET
ok:
MOVD R0, r1+56(FP) // r1
MOVD R1, r2+64(FP) // r2
MOVD ZR, R0
MOVD R0, err+72(FP) // err
RET
// Actually Syscall7
TEXT ·Syscall9(SB),NOSPLIT,$0-104
BL runtime·entersyscall<ABIInternal>(SB)
MOVD num+0(FP), R17 // syscall entry
MOVD a1+8(FP), R0
MOVD a2+16(FP), R1
MOVD a3+24(FP), R2
MOVD a4+32(FP), R3
MOVD a5+40(FP), R4
MOVD a6+48(FP), R5
MOVD a7+56(FP), R6
//MOVD a8+64(FP), R7
//MOVD a9+72(FP), R8
SVC $SYS_syscall
BCC ok
MOVD $-1, R1
MOVD R1, r1+80(FP) // r1
MOVD ZR, r2+88(FP) // r2
MOVD R0, err+96(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVD R0, r1+80(FP) // r1
MOVD R1, r2+88(FP) // r2
MOVD ZR, err+96(FP) // err
BL runtime·exitsyscall<ABIInternal>(SB)
RET

32
src/syscall/asm_openbsd_386.s Normal file
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for 386, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-28
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-40
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-52
JMP ·syscall9Internal(SB)

32
src/syscall/asm_openbsd_amd64.s Normal file
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@@ -0,0 +1,32 @@
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for AMD64, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-56
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
JMP ·syscall9Internal(SB)

32
src/syscall/asm_openbsd_arm.s Normal file
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@@ -0,0 +1,32 @@
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for ARM, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-28
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-40
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-52
JMP ·syscall9Internal(SB)

32
src/syscall/asm_openbsd_arm64.s Normal file
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@@ -0,0 +1,32 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for ARM64, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-56
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
JMP ·syscall9Internal(SB)

129
src/syscall/asm_openbsd_mips64.s Normal file
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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
TEXT ·Syscall(SB),NOSPLIT,$0-56
JAL runtime·entersyscall(SB)
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV R0, R7
MOVV R0, R8
MOVV R0, R9
MOVV trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok
MOVV $-1, R1
MOVV R1, r1+32(FP) // r1
MOVV R0, r2+40(FP) // r2
MOVV R2, err+48(FP) // errno
JAL runtime·exitsyscall(SB)
RET
ok:
MOVV R2, r1+32(FP) // r1
MOVV R3, r2+40(FP) // r2
MOVV R0, err+48(FP) // errno
JAL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JAL runtime·entersyscall(SB)
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV a4+32(FP), R7
MOVV a5+40(FP), R8
MOVV a6+48(FP), R9
MOVV trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok6
MOVV $-1, R1
MOVV R1, r1+56(FP) // r1
MOVV R0, r2+64(FP) // r2
MOVV R2, err+72(FP) // errno
JAL runtime·exitsyscall(SB)
RET
ok6:
MOVV R2, r1+56(FP) // r1
MOVV R3, r2+64(FP) // r2
MOVV R0, err+72(FP) // errno
JAL runtime·exitsyscall(SB)
RET
// func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64);
// The openbsd/mips64 kernel only accepts eight syscall arguments, except
// for SYS_syscall, where an additional argument can be passed on the stack.
TEXT ·Syscall9(SB),NOSPLIT,$0-104
JAL runtime·entersyscall(SB)
MOVV num+0(FP), R2 // syscall entry
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV a4+32(FP), R7
MOVV a5+40(FP), R8
MOVV a6+48(FP), R9
MOVV a7+56(FP), R10
MOVV a8+64(FP), R11
MOVV a9+72(FP), R12
SUBVU $16, R29
MOVV R12, 0(R29) // arg 9 - only used for SYS_syscall.
SYSCALL
ADDV $16, R29
BEQ R7, ok9
MOVV $-1, R1
MOVV R1, r1+80(FP) // r1
MOVV R0, r2+88(FP) // r2
MOVV R2, err+96(FP) // errno
JAL runtime·exitsyscall(SB)
RET
ok9:
MOVV R2, r1+80(FP) // r1
MOVV R3, r2+88(FP) // r2
MOVV R0, err+96(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV R0, R7
MOVV R0, R8
MOVV R0, R9
MOVV trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok1
MOVV $-1, R1
MOVV R1, r1+32(FP) // r1
MOVV R0, r2+40(FP) // r2
MOVV R2, err+48(FP) // errno
RET
ok1:
MOVV R2, r1+32(FP) // r1
MOVV R3, r2+40(FP) // r2
MOVV R0, err+48(FP) // errno
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVV a1+8(FP), R4
MOVV a2+16(FP), R5
MOVV a3+24(FP), R6
MOVV a4+32(FP), R7
MOVV a5+40(FP), R8
MOVV a6+48(FP), R9
MOVV trap+0(FP), R2 // syscall entry
SYSCALL
BEQ R7, ok2
MOVV $-1, R1
MOVV R1, r1+56(FP) // r1
MOVV R0, r2+64(FP) // r2
MOVV R2, err+72(FP) // errno
RET
ok2:
MOVV R2, r1+56(FP) // r1
MOVV R3, r2+64(FP) // r2
MOVV R0, err+72(FP) // errno
RET

32
src/syscall/asm_openbsd_ppc64.s Normal file
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for PPC64, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-56
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
JMP ·syscall9Internal(SB)

32
src/syscall/asm_openbsd_riscv64.s Normal file
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@@ -0,0 +1,32 @@
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System call support for RISCV64, OpenBSD
//
// Provide these function names via assembly so they are provided as ABI0,
// rather than ABIInternal.
// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall(SB),NOSPLIT,$0-56
JMP ·syscallInternal(SB)
// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
JMP ·syscall6Internal(SB)
// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
JMP ·rawSyscallInternal(SB)
// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
JMP ·rawSyscall6Internal(SB)
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·Syscall9(SB),NOSPLIT,$0-104
JMP ·syscall9Internal(SB)

178
src/syscall/asm_plan9_386.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for 386, Plan 9
//
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
// Trap # in AX, args on stack above caller pc.
TEXT ·Syscall(SB),NOSPLIT,$148-32
NO_LOCAL_POINTERS
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL $0, r2+20(FP)
CMPL AX, $-1
JNE ok3
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime·exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime·gostring(SB)
LEAL str-144(SP), SI
JMP copyresult3
ok3:
CALL runtime·exitsyscall(SB)
LEAL ·emptystring(SB), SI
copyresult3:
LEAL err+24(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT ·Syscall6(SB),NOSPLIT,$148-44
NO_LOCAL_POINTERS
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL $0, r2+32(FP)
CMPL AX, $-1
JNE ok4
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime·exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime·gostring(SB)
LEAL str-144(SP), SI
JMP copyresult4
ok4:
CALL runtime·exitsyscall(SB)
LEAL ·emptystring(SB), SI
copyresult4:
LEAL err+36(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL AX, r2+20(FP)
MOVL AX, err+24(FP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL AX, r2+32(FP)
MOVL AX, err+36(FP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$24-36
NO_LOCAL_POINTERS
LEAL newoffset+20(FP), AX
MOVL AX, placeholder+0(FP)
// copy args down
LEAL placeholder+0(FP), SI
LEAL sysargs-20(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVL $SYS_SEEK, AX // syscall entry
INT $64
CMPL AX, $-1
JNE ok6
MOVL AX, newoffset_lo+20(FP)
MOVL AX, newoffset_hi+24(FP)
CALL syscall·errstr(SB)
MOVL SP, SI
JMP copyresult6
ok6:
LEAL ·emptystring(SB), SI
copyresult6:
LEAL err+28(FP), DI
CLD
MOVSL
MOVSL
RET

176
src/syscall/asm_plan9_amd64.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for Plan 9
//
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
TEXT ·Syscall(SB),NOSPLIT,$168-64
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ $0, r2+40(FP)
CMPL AX, $-1
JNE ok3
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult3
ok3:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult3:
LEAQ err+48(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·Syscall6(SB),NOSPLIT,$168-88
NO_LOCAL_POINTERS
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ $0, r2+64(FP)
CMPL AX, $-1
JNE ok4
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime·gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult4
ok4:
CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ ·emptystring(SB), SI
copyresult4:
LEAQ err+72(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ AX, r2+40(FP)
MOVQ AX, err+48(FP)
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ AX, r2+64(FP)
MOVQ AX, err+72(FP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$48-56
NO_LOCAL_POINTERS
LEAQ newoffset+32(FP), AX
MOVQ AX, placeholder+0(FP)
// copy args down
LEAQ placeholder+0(FP), SI
LEAQ sysargs-40(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ AX, newoffset+32(FP)
CALL syscall·errstr(SB)
MOVQ SP, SI
JMP copyresult6
ok6:
LEAQ ·emptystring(SB), SI
copyresult6:
LEAQ err+40(FP), DI
CLD
MOVSQ
MOVSQ
RET

132
src/syscall/asm_plan9_arm.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
// System call support for plan9 on arm
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err ErrorString)
TEXT ·Syscall(SB),NOSPLIT,$144-32
NO_LOCAL_POINTERS
BL runtime·entersyscall(SB)
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-144(SP), R1
MOVM.IA (R0), [R2-R4]
MOVM.IA [R2-R4], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW $0, R2
MOVW $r1+16(FP), R3
MOVM.IA [R0,R2], (R3)
CMP $-1, R0
B.EQ syscallerr
BL runtime·exitsyscall(SB)
MOVW $·emptystring+0(SB), R2
B syscallok
syscallerr:
MOVW $errbuf-128(SP), R2
MOVW $128, R3
MOVM.IA [R2,R3], (R1)
MOVW $SYS_ERRSTR, R0
SWI $0
BL runtime·exitsyscall(SB)
BL runtime·gostring(SB)
MOVW $str-140(SP), R2
syscallok:
MOVW $err+24(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err ErrorString)
// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
TEXT ·Syscall6(SB),NOSPLIT,$144-44
NO_LOCAL_POINTERS
BL runtime·entersyscall(SB)
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-144(SP), R1
MOVM.IA (R0), [R2-R6]
MOVM.IA [R2-R6], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW $0, R2
MOVW $r1+28(FP), R3
MOVM.IA.W [R0,R2], (R3)
CMP $-1, R0
B.EQ syscall6err
BL runtime·exitsyscall(SB)
MOVW $·emptystring+0(SB), R2
B syscall6ok
syscall6err:
MOVW $errbuf-128(SP), R2
MOVW $128, R3
MOVM.IA [R2,R3], (R1)
MOVW $SYS_ERRSTR, R0
SWI $0
BL runtime·exitsyscall(SB)
BL runtime·gostring(SB)
MOVW $str-140(SP), R2
syscall6ok:
MOVW $err+36(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$12-28
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-12(SP), R1
MOVM.IA (R0), [R2-R4]
MOVM.IA [R2-R4], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW R0, r1+16(FP)
MOVW R0, r2+20(FP)
MOVW R0, err+24(FP)
RET
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
TEXT ·RawSyscall6(SB),NOSPLIT,$20-40
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-20(SP), R1
MOVM.IA (R0), [R2-R6]
MOVM.IA [R2-R6], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW R0, r1+28(FP)
MOVW R0, r2+32(FP)
MOVW R0, err+36(FP)
RET
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),NOSPLIT,$20-36
NO_LOCAL_POINTERS
MOVW $newoffset_lo+20(FP), R6
MOVW R6, sysargs-20(SP) // dest for return value
MOVW $fd+4(FP), R0 // move syscall args
MOVW $sysarg1-16(SP), R1
MOVM.IA (R0), [R2-R5]
MOVM.IA [R2-R5], (R1)
MOVW $SYS_SEEK, R0 // syscall num
SWI $0
CMP $-1, R0
B.EQ seekerr
MOVW $·emptystring+0(SB), R2
B seekok
seekerr:
MOVW R0, 0(R6)
MOVW R0, 4(R6)
BL ·errstr(SB)
MOVW $ret-20(SP), R2
seekok:
MOVW $err+28(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET

82
src/syscall/asm_solaris_amd64.s Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
//
// System calls for solaris/amd64 are implemented in ../runtime/syscall_solaris.go
//
TEXT ·sysvicall6(SB),NOSPLIT,$0
JMP runtime·syscall_sysvicall6(SB)
TEXT ·rawSysvicall6(SB),NOSPLIT,$0
JMP runtime·syscall_rawsysvicall6(SB)
TEXT ·chdir(SB),NOSPLIT,$0
JMP runtime·syscall_chdir(SB)
TEXT ·chroot1(SB),NOSPLIT,$0
JMP runtime·syscall_chroot(SB)
TEXT ·closeFD(SB),NOSPLIT,$0
JMP runtime·syscall_close(SB)
TEXT ·dup2child(SB),NOSPLIT,$0
JMP runtime·syscall_dup2(SB)
RET
TEXT ·execve(SB),NOSPLIT,$0
JMP runtime·syscall_execve(SB)
TEXT ·exit(SB),NOSPLIT,$0
JMP runtime·syscall_exit(SB)
TEXT ·fcntl1(SB),NOSPLIT,$0
JMP runtime·syscall_fcntl(SB)
TEXT ·forkx(SB),NOSPLIT,$0
JMP runtime·syscall_forkx(SB)
TEXT ·gethostname(SB),NOSPLIT,$0
JMP runtime·syscall_gethostname(SB)
TEXT ·getpid(SB),NOSPLIT,$0
JMP runtime·syscall_getpid(SB)
TEXT ·ioctl(SB),NOSPLIT,$0
JMP runtime·syscall_ioctl(SB)
TEXT ·RawSyscall(SB),NOSPLIT,$0
JMP runtime·syscall_rawsyscall(SB)
TEXT ·RawSyscall6(SB),NOSPLIT,$0
JMP runtime·syscall_rawsyscall6(SB)
TEXT ·setgid(SB),NOSPLIT,$0
JMP runtime·syscall_setgid(SB)
TEXT ·setgroups1(SB),NOSPLIT,$0
JMP runtime·syscall_setgroups(SB)
TEXT ·setrlimit1(SB),NOSPLIT,$0
JMP runtime·syscall_setrlimit(SB)
TEXT ·setsid(SB),NOSPLIT,$0
JMP runtime·syscall_setsid(SB)
TEXT ·setuid(SB),NOSPLIT,$0
JMP runtime·syscall_setuid(SB)
TEXT ·setpgid(SB),NOSPLIT,$0
JMP runtime·syscall_setpgid(SB)
TEXT ·Syscall(SB),NOSPLIT,$0
JMP runtime·syscall_syscall(SB)
TEXT ·wait4(SB),NOSPLIT,$0
JMP runtime·syscall_wait4(SB)
TEXT ·write1(SB),NOSPLIT,$0
JMP runtime·syscall_write(SB)

142
src/syscall/asm_unix_386.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build freebsd || netbsd
#include "textflag.h"
#include "funcdata.h"
//
// System call support for some 386 unixes
//
// func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
// func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
// Trap # in AX, args on stack above caller pc.
TEXT ·Syscall(SB),NOSPLIT,$0-28
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok
MOVL $-1, r1+16(FP) // r1
MOVL $-1, r2+20(FP) // r2
MOVL AX, err+24(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok:
MOVL AX, r1+16(FP) // r1
MOVL DX, r2+20(FP) // r2
MOVL $0, err+24(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-40
CALL runtime·entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok6
MOVL $-1, r1+28(FP) // r1
MOVL $-1, r2+32(FP) // r2
MOVL AX, err+36(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok6:
MOVL AX, r1+28(FP) // r1
MOVL DX, r2+32(FP) // r2
MOVL $0, err+36(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall9(SB),NOSPLIT,$0-52
CALL runtime·entersyscall(SB)
MOVL num+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL num+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok9
MOVL $-1, r1+40(FP) // r1
MOVL $-1, r2+44(FP) // r2
MOVL AX, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok9:
MOVL AX, r1+40(FP) // r1
MOVL DX, r2+44(FP) // r2
MOVL $0, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok1
MOVL $-1, r1+16(FP) // r1
MOVL $-1, r2+20(FP) // r2
MOVL AX, err+24(FP) // errno
RET
ok1:
MOVL AX, r1+16(FP) // r1
MOVL DX, r2+20(FP) // r2
MOVL $0, err+24(FP) // errno
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok2
MOVL $-1, r1+28(FP) // r1
MOVL $-1, r2+32(FP) // r2
MOVL AX, err+36(FP) // errno
RET
ok2:
MOVL AX, r1+28(FP) // r1
MOVL DX, r2+32(FP) // r2
MOVL $0, err+36(FP) // errno
RET

96
src/syscall/asm_unix_amd64.s Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build dragonfly || freebsd || netbsd
#include "textflag.h"
#include "funcdata.h"
//
// System call support for AMD64 unixes
//
// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64)
// func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64)
// Trap # in AX, args in DI SI DX, return in AX DX
TEXT ·Syscall(SB),NOSPLIT,$0-56
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), AX // syscall entry
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
SYSCALL
JCC ok
MOVQ $-1, r1+32(FP) // r1
MOVQ $0, r2+40(FP) // r2
MOVQ AX, err+48(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok:
MOVQ AX, r1+32(FP) // r1
MOVQ DX, r2+40(FP) // r2
MOVQ $0, err+48(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-80
CALL runtime·entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), AX // syscall entry
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
SYSCALL
JCC ok6
MOVQ $-1, r1+56(FP) // r1
MOVQ $0, r2+64(FP) // r2
MOVQ AX, err+72(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
ok6:
MOVQ AX, r1+56(FP) // r1
MOVQ DX, r2+64(FP) // r2
MOVQ $0, err+72(FP) // errno
CALL runtime·exitsyscall<ABIInternal>(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ trap+0(FP), AX // syscall entry
SYSCALL
JCC ok1
MOVQ $-1, r1+32(FP) // r1
MOVQ $0, r2+40(FP) // r2
MOVQ AX, err+48(FP) // errno
RET
ok1:
MOVQ AX, r1+32(FP) // r1
MOVQ DX, r2+40(FP) // r2
MOVQ $0, err+48(FP) // errno
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX
MOVQ a4+32(FP), R10
MOVQ a5+40(FP), R8
MOVQ a6+48(FP), R9
MOVQ trap+0(FP), AX // syscall entry
SYSCALL
JCC ok2
MOVQ $-1, r1+56(FP) // r1
MOVQ $0, r2+64(FP) // r2
MOVQ AX, err+72(FP) // errno
RET
ok2:
MOVQ AX, r1+56(FP) // r1
MOVQ DX, r2+64(FP) // r2
MOVQ $0, err+72(FP) // errno
RET

22
src/syscall/badlinkname_unix.go Normal file
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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
package syscall
import _ "unsafe"
// As of Go 1.22, the symbols below are found to be pulled via
// linkname in the wild. We provide a push linkname here, to
// keep them accessible with pull linknames.
// This may change in the future. Please do not depend on them
// in new code.
// golang.org/x/sys linknames getsockopt.
// Do not remove or change the type signature.
//
//go:linkname getsockopt
//go:linkname setsockopt

187
src/syscall/bpf_bsd.go Normal file
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@@ -0,0 +1,187 @@
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
// Berkeley packet filter for BSD variants
package syscall
import (
"unsafe"
)
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfStmt(code, k int) *BpfInsn {
return &BpfInsn{Code: uint16(code), K: uint32(k)}
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfJump(code, k, jt, jf int) *BpfInsn {
return &BpfInsn{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfBuflen(fd int) (int, error) {
var l int
err := ioctlPtr(fd, BIOCGBLEN, unsafe.Pointer(&l))
if err != nil {
return 0, err
}
return l, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfBuflen(fd, l int) (int, error) {
err := ioctlPtr(fd, BIOCSBLEN, unsafe.Pointer(&l))
if err != nil {
return 0, err
}
return l, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfDatalink(fd int) (int, error) {
var t int
err := ioctlPtr(fd, BIOCGDLT, unsafe.Pointer(&t))
if err != nil {
return 0, err
}
return t, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfDatalink(fd, t int) (int, error) {
err := ioctlPtr(fd, BIOCSDLT, unsafe.Pointer(&t))
if err != nil {
return 0, err
}
return t, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfPromisc(fd, m int) error {
err := ioctlPtr(fd, BIOCPROMISC, unsafe.Pointer(&m))
if err != nil {
return err
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func FlushBpf(fd int) error {
err := ioctlPtr(fd, BIOCFLUSH, nil)
if err != nil {
return err
}
return nil
}
type ivalue struct {
name [IFNAMSIZ]byte
value int16
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfInterface(fd int, name string) (string, error) {
var iv ivalue
err := ioctlPtr(fd, BIOCGETIF, unsafe.Pointer(&iv))
if err != nil {
return "", err
}
return name, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfInterface(fd int, name string) error {
var iv ivalue
copy(iv.name[:], []byte(name))
err := ioctlPtr(fd, BIOCSETIF, unsafe.Pointer(&iv))
if err != nil {
return err
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfTimeout(fd int) (*Timeval, error) {
var tv Timeval
err := ioctlPtr(fd, BIOCGRTIMEOUT, unsafe.Pointer(&tv))
if err != nil {
return nil, err
}
return &tv, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfTimeout(fd int, tv *Timeval) error {
err := ioctlPtr(fd, BIOCSRTIMEOUT, unsafe.Pointer(tv))
if err != nil {
return err
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfStats(fd int) (*BpfStat, error) {
var s BpfStat
err := ioctlPtr(fd, BIOCGSTATS, unsafe.Pointer(&s))
if err != nil {
return nil, err
}
return &s, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfImmediate(fd, m int) error {
err := ioctlPtr(fd, BIOCIMMEDIATE, unsafe.Pointer(&m))
if err != nil {
return err
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpf(fd int, i []BpfInsn) error {
var p BpfProgram
p.Len = uint32(len(i))
p.Insns = (*BpfInsn)(unsafe.Pointer(&i[0]))
err := ioctlPtr(fd, BIOCSETF, unsafe.Pointer(&p))
if err != nil {
return err
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func CheckBpfVersion(fd int) error {
var v BpfVersion
err := ioctlPtr(fd, BIOCVERSION, unsafe.Pointer(&v))
if err != nil {
return err
}
if v.Major != BPF_MAJOR_VERSION || v.Minor != BPF_MINOR_VERSION {
return EINVAL
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func BpfHeadercmpl(fd int) (int, error) {
var f int
err := ioctlPtr(fd, BIOCGHDRCMPLT, unsafe.Pointer(&f))
if err != nil {
return 0, err
}
return f, nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfHeadercmpl(fd, f int) error {
err := ioctlPtr(fd, BIOCSHDRCMPLT, unsafe.Pointer(&f))
if err != nil {
return err
}
return nil
}

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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
// Plan 9 Constants
// Open modes
const (
O_RDONLY = 0
O_WRONLY = 1
O_RDWR = 2
O_TRUNC = 16
O_CLOEXEC = 32
O_EXCL = 0x1000
)
// Bind flags
const (
MORDER = 0x0003 // mask for bits defining order of mounting
MREPL = 0x0000 // mount replaces object
MBEFORE = 0x0001 // mount goes before others in union directory
MAFTER = 0x0002 // mount goes after others in union directory
MCREATE = 0x0004 // permit creation in mounted directory
MCACHE = 0x0010 // cache some data
MMASK = 0x0017 // all bits on
)
// Rfork flags
const (
RFNAMEG = 1 << 0
RFENVG = 1 << 1
RFFDG = 1 << 2
RFNOTEG = 1 << 3
RFPROC = 1 << 4
RFMEM = 1 << 5
RFNOWAIT = 1 << 6
RFCNAMEG = 1 << 10
RFCENVG = 1 << 11
RFCFDG = 1 << 12
RFREND = 1 << 13
RFNOMNT = 1 << 14
)
// Qid.Type bits
const (
QTDIR = 0x80
QTAPPEND = 0x40
QTEXCL = 0x20
QTMOUNT = 0x10
QTAUTH = 0x08
QTTMP = 0x04
QTFILE = 0x00
)
// Dir.Mode bits
const (
DMDIR = 0x80000000
DMAPPEND = 0x40000000
DMEXCL = 0x20000000
DMMOUNT = 0x10000000
DMAUTH = 0x08000000
DMTMP = 0x04000000
DMREAD = 0x4
DMWRITE = 0x2
DMEXEC = 0x1
)
const (
STATMAX = 65535
ERRMAX = 128
STATFIXLEN = 49
)

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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
package syscall_test
import (
"bytes"
"net"
"os"
"syscall"
"testing"
)
// TestSCMCredentials tests the sending and receiving of credentials
// (PID, UID, GID) in an ancillary message between two UNIX
// sockets. The SO_PASSCRED socket option is enabled on the sending
// socket for this to work.
func TestSCMCredentials(t *testing.T) {
socketTypeTests := []struct {
socketType int
dataLen int
}{
{
syscall.SOCK_STREAM,
1,
}, {
syscall.SOCK_DGRAM,
0,
},
}
for _, tt := range socketTypeTests {
fds, err := syscall.Socketpair(syscall.AF_LOCAL, tt.socketType, 0)
if err != nil {
t.Fatalf("Socketpair: %v", err)
}
err = syscall.SetsockoptInt(fds[0], syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
if err != nil {
syscall.Close(fds[0])
syscall.Close(fds[1])
t.Fatalf("SetsockoptInt: %v", err)
}
srvFile := os.NewFile(uintptr(fds[0]), "server")
cliFile := os.NewFile(uintptr(fds[1]), "client")
defer srvFile.Close()
defer cliFile.Close()
srv, err := net.FileConn(srvFile)
if err != nil {
t.Errorf("FileConn: %v", err)
return
}
defer srv.Close()
cli, err := net.FileConn(cliFile)
if err != nil {
t.Errorf("FileConn: %v", err)
return
}
defer cli.Close()
var ucred syscall.Ucred
if os.Getuid() != 0 {
ucred.Pid = int32(os.Getpid())
ucred.Uid = 0
ucred.Gid = 0
oob := syscall.UnixCredentials(&ucred)
_, _, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
if op, ok := err.(*net.OpError); ok {
err = op.Err
}
if sys, ok := err.(*os.SyscallError); ok {
err = sys.Err
}
switch err {
case syscall.EPERM, syscall.EINVAL:
default:
t.Fatalf("WriteMsgUnix failed with %v, want EPERM or EINVAL", err)
}
}
ucred.Pid = int32(os.Getpid())
ucred.Uid = uint32(os.Getuid())
ucred.Gid = uint32(os.Getgid())
oob := syscall.UnixCredentials(&ucred)
// On SOCK_STREAM, this is internally going to send a dummy byte
n, oobn, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
if err != nil {
t.Fatalf("WriteMsgUnix: %v", err)
}
if n != 0 {
t.Fatalf("WriteMsgUnix n = %d, want 0", n)
}
if oobn != len(oob) {
t.Fatalf("WriteMsgUnix oobn = %d, want %d", oobn, len(oob))
}
oob2 := make([]byte, 10*len(oob))
n, oobn2, flags, _, err := srv.(*net.UnixConn).ReadMsgUnix(nil, oob2)
if err != nil {
t.Fatalf("ReadMsgUnix: %v", err)
}
if flags != syscall.MSG_CMSG_CLOEXEC {
t.Fatalf("ReadMsgUnix flags = %#x, want %#x (MSG_CMSG_CLOEXEC)", flags, syscall.MSG_CMSG_CLOEXEC)
}
if n != tt.dataLen {
t.Fatalf("ReadMsgUnix n = %d, want %d", n, tt.dataLen)
}
if oobn2 != oobn {
// without SO_PASSCRED set on the socket, ReadMsgUnix will
// return zero oob bytes
t.Fatalf("ReadMsgUnix oobn = %d, want %d", oobn2, oobn)
}
oob2 = oob2[:oobn2]
if !bytes.Equal(oob, oob2) {
t.Fatal("ReadMsgUnix oob bytes don't match")
}
scm, err := syscall.ParseSocketControlMessage(oob2)
if err != nil {
t.Fatalf("ParseSocketControlMessage: %v", err)
}
newUcred, err := syscall.ParseUnixCredentials(&scm[0])
if err != nil {
t.Fatalf("ParseUnixCredentials: %v", err)
}
if *newUcred != ucred {
t.Fatalf("ParseUnixCredentials = %+v, want %+v", newUcred, ucred)
}
}
}

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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Plan 9 directory marshaling. See intro(5).
package syscall
import (
"errors"
"internal/byteorder"
)
var (
ErrShortStat = errors.New("stat buffer too short")
ErrBadStat = errors.New("malformed stat buffer")
ErrBadName = errors.New("bad character in file name")
)
// A Qid represents a 9P server's unique identification for a file.
type Qid struct {
Path uint64 // the file server's unique identification for the file
Vers uint32 // version number for given Path
Type uint8 // the type of the file (syscall.QTDIR for example)
}
// A Dir contains the metadata for a file.
type Dir struct {
// system-modified data
Type uint16 // server type
Dev uint32 // server subtype
// file data
Qid Qid // unique id from server
Mode uint32 // permissions
Atime uint32 // last read time
Mtime uint32 // last write time
Length int64 // file length
Name string // last element of path
Uid string // owner name
Gid string // group name
Muid string // last modifier name
}
var nullDir = Dir{
Type: ^uint16(0),
Dev: ^uint32(0),
Qid: Qid{
Path: ^uint64(0),
Vers: ^uint32(0),
Type: ^uint8(0),
},
Mode: ^uint32(0),
Atime: ^uint32(0),
Mtime: ^uint32(0),
Length: ^int64(0),
}
// Null assigns special "don't touch" values to members of d to
// avoid modifying them during [Wstat].
func (d *Dir) Null() { *d = nullDir }
// Marshal encodes a 9P stat message corresponding to d into b
//
// If there isn't enough space in b for a stat message, [ErrShortStat] is returned.
func (d *Dir) Marshal(b []byte) (n int, err error) {
n = STATFIXLEN + len(d.Name) + len(d.Uid) + len(d.Gid) + len(d.Muid)
if n > len(b) {
return n, ErrShortStat
}
for _, c := range d.Name {
if c == '/' {
return n, ErrBadName
}
}
b = pbit16(b, uint16(n)-2)
b = pbit16(b, d.Type)
b = pbit32(b, d.Dev)
b = pbit8(b, d.Qid.Type)
b = pbit32(b, d.Qid.Vers)
b = pbit64(b, d.Qid.Path)
b = pbit32(b, d.Mode)
b = pbit32(b, d.Atime)
b = pbit32(b, d.Mtime)
b = pbit64(b, uint64(d.Length))
b = pstring(b, d.Name)
b = pstring(b, d.Uid)
b = pstring(b, d.Gid)
b = pstring(b, d.Muid)
return n, nil
}
// UnmarshalDir decodes a single 9P stat message from b and returns the resulting Dir.
//
// If b is too small to hold a valid stat message, [ErrShortStat] is returned.
//
// If the stat message itself is invalid, [ErrBadStat] is returned.
func UnmarshalDir(b []byte) (*Dir, error) {
if len(b) < STATFIXLEN {
return nil, ErrShortStat
}
size, buf := gbit16(b)
if len(b) != int(size)+2 {
return nil, ErrBadStat
}
b = buf
var d Dir
d.Type, b = gbit16(b)
d.Dev, b = gbit32(b)
d.Qid.Type, b = gbit8(b)
d.Qid.Vers, b = gbit32(b)
d.Qid.Path, b = gbit64(b)
d.Mode, b = gbit32(b)
d.Atime, b = gbit32(b)
d.Mtime, b = gbit32(b)
n, b := gbit64(b)
d.Length = int64(n)
var ok bool
if d.Name, b, ok = gstring(b); !ok {
return nil, ErrBadStat
}
if d.Uid, b, ok = gstring(b); !ok {
return nil, ErrBadStat
}
if d.Gid, b, ok = gstring(b); !ok {
return nil, ErrBadStat
}
if d.Muid, b, ok = gstring(b); !ok {
return nil, ErrBadStat
}
return &d, nil
}
// pbit8 copies the 8-bit number v to b and returns the remaining slice of b.
func pbit8(b []byte, v uint8) []byte {
b[0] = byte(v)
return b[1:]
}
// pbit16 copies the 16-bit number v to b in little-endian order and returns the remaining slice of b.
func pbit16(b []byte, v uint16) []byte {
byteorder.LePutUint16(b, v)
return b[2:]
}
// pbit32 copies the 32-bit number v to b in little-endian order and returns the remaining slice of b.
func pbit32(b []byte, v uint32) []byte {
byteorder.LePutUint32(b, v)
return b[4:]
}
// pbit64 copies the 64-bit number v to b in little-endian order and returns the remaining slice of b.
func pbit64(b []byte, v uint64) []byte {
byteorder.LePutUint64(b, v)
return b[8:]
}
// pstring copies the string s to b, prepending it with a 16-bit length in little-endian order, and
// returning the remaining slice of b..
func pstring(b []byte, s string) []byte {
b = pbit16(b, uint16(len(s)))
n := copy(b, s)
return b[n:]
}
// gbit8 reads an 8-bit number from b and returns it with the remaining slice of b.
func gbit8(b []byte) (uint8, []byte) {
return uint8(b[0]), b[1:]
}
// gbit16 reads a 16-bit number in little-endian order from b and returns it with the remaining slice of b.
//
//go:nosplit
func gbit16(b []byte) (uint16, []byte) {
return byteorder.LeUint16(b), b[2:]
}
// gbit32 reads a 32-bit number in little-endian order from b and returns it with the remaining slice of b.
func gbit32(b []byte) (uint32, []byte) {
return byteorder.LeUint32(b), b[4:]
}
// gbit64 reads a 64-bit number in little-endian order from b and returns it with the remaining slice of b.
func gbit64(b []byte) (uint64, []byte) {
return byteorder.LeUint64(b), b[8:]
}
// gstring reads a string from b, prefixed with a 16-bit length in little-endian order.
// It returns the string with the remaining slice of b and a boolean. If the length is
// greater than the number of bytes in b, the boolean will be false.
func gstring(b []byte) (string, []byte, bool) {
n, b := gbit16(b)
if int(n) > len(b) {
return "", b, false
}
return string(b[:n]), b[n:], true
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix || (js && wasm) || wasip1
package syscall
import (
"internal/byteorder"
"internal/goarch"
"runtime"
"unsafe"
)
// readInt returns the size-bytes unsigned integer in native byte order at offset off.
func readInt(b []byte, off, size uintptr) (u uint64, ok bool) {
if len(b) < int(off+size) {
return 0, false
}
if goarch.BigEndian {
return readIntBE(b[off:], size), true
}
return readIntLE(b[off:], size), true
}
func readIntBE(b []byte, size uintptr) uint64 {
switch size {
case 1:
return uint64(b[0])
case 2:
return uint64(byteorder.BeUint16(b))
case 4:
return uint64(byteorder.BeUint32(b))
case 8:
return uint64(byteorder.BeUint64(b))
default:
panic("syscall: readInt with unsupported size")
}
}
func readIntLE(b []byte, size uintptr) uint64 {
switch size {
case 1:
return uint64(b[0])
case 2:
return uint64(byteorder.LeUint16(b))
case 4:
return uint64(byteorder.LeUint32(b))
case 8:
return uint64(byteorder.LeUint64(b))
default:
panic("syscall: readInt with unsupported size")
}
}
// ParseDirent parses up to max directory entries in buf,
// appending the names to names. It returns the number of
// bytes consumed from buf, the number of entries added
// to names, and the new names slice.
func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) {
origlen := len(buf)
count = 0
for max != 0 && len(buf) > 0 {
reclen, ok := direntReclen(buf)
if !ok || reclen > uint64(len(buf)) {
return origlen, count, names
}
rec := buf[:reclen]
buf = buf[reclen:]
ino, ok := direntIno(rec)
if !ok {
break
}
// See src/os/dir_unix.go for the reason why this condition is
// excluded on wasip1.
if ino == 0 && runtime.GOOS != "wasip1" { // File absent in directory.
continue
}
const namoff = uint64(unsafe.Offsetof(Dirent{}.Name))
namlen, ok := direntNamlen(rec)
if !ok || namoff+namlen > uint64(len(rec)) {
break
}
name := rec[namoff : namoff+namlen]
for i, c := range name {
if c == 0 {
name = name[:i]
break
}
}
// Check for useless names before allocating a string.
if string(name) == "." || string(name) == ".." {
continue
}
max--
count++
names = append(names, string(name))
}
return origlen - len(buf), count, names
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package syscall_test
import (
"bytes"
"fmt"
"os"
"path/filepath"
"runtime"
"slices"
"strconv"
"strings"
"syscall"
"testing"
"unsafe"
)
func TestDirent(t *testing.T) {
const (
direntBufSize = 2048 // arbitrary? See https://go.dev/issue/37323.
filenameMinSize = 11
)
d := t.TempDir()
t.Logf("tmpdir: %s", d)
for i, c := range []byte("0123456789") {
name := string(bytes.Repeat([]byte{c}, filenameMinSize+i))
err := os.WriteFile(filepath.Join(d, name), nil, 0644)
if err != nil {
t.Fatalf("writefile: %v", err)
}
}
names := make([]string, 0, 10)
fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
if err != nil {
t.Fatalf("syscall.open: %v", err)
}
defer syscall.Close(fd)
buf := bytes.Repeat([]byte{0xCD}, direntBufSize)
for {
n, err := syscall.ReadDirent(fd, buf)
if err == syscall.EINVAL {
// On linux, 'man getdents64' says that EINVAL indicates “result buffer is too small”.
// Try a bigger buffer.
t.Logf("ReadDirent: %v; retrying with larger buffer", err)
buf = bytes.Repeat([]byte{0xCD}, len(buf)*2)
continue
}
if err != nil {
t.Fatalf("syscall.readdir: %v", err)
}
t.Logf("ReadDirent: read %d bytes", n)
if n == 0 {
break
}
var consumed, count int
consumed, count, names = syscall.ParseDirent(buf[:n], -1, names)
t.Logf("ParseDirent: %d new name(s)", count)
if consumed != n {
t.Fatalf("ParseDirent: consumed %d bytes; expected %d", consumed, n)
}
}
slices.Sort(names)
t.Logf("names: %q", names)
if len(names) != 10 {
t.Errorf("got %d names; expected 10", len(names))
}
for i, name := range names {
ord, err := strconv.Atoi(name[:1])
if err != nil {
t.Fatalf("names[%d] is non-integer %q: %v", i, names[i], err)
}
if expected := strings.Repeat(name[:1], filenameMinSize+ord); name != expected {
t.Errorf("names[%d] is %q (len %d); expected %q (len %d)", i, name, len(name), expected, len(expected))
}
}
}
func TestDirentRepeat(t *testing.T) {
const N = 100
// Note: the size of the buffer is small enough that the loop
// below will need to execute multiple times. See issue #31368.
size := N * unsafe.Offsetof(syscall.Dirent{}.Name) / 4
if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" {
if size < 1024 {
size = 1024 // DIRBLKSIZ, see issue 31403.
}
}
// Make a directory containing N files
d := t.TempDir()
var files []string
for i := 0; i < N; i++ {
files = append(files, fmt.Sprintf("file%d", i))
}
for _, file := range files {
err := os.WriteFile(filepath.Join(d, file), []byte("contents"), 0644)
if err != nil {
t.Fatalf("writefile: %v", err)
}
}
// Read the directory entries using ReadDirent.
fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
if err != nil {
t.Fatalf("syscall.open: %v", err)
}
defer syscall.Close(fd)
var files2 []string
for {
buf := make([]byte, size)
n, err := syscall.ReadDirent(fd, buf)
if err != nil {
t.Fatalf("syscall.readdir: %v", err)
}
if n == 0 {
break
}
buf = buf[:n]
for len(buf) > 0 {
var consumed int
consumed, _, files2 = syscall.ParseDirent(buf, -1, files2)
buf = buf[consumed:]
}
}
// Check results
slices.Sort(files)
slices.Sort(files2)
if strings.Join(files, "|") != strings.Join(files2, "|") {
t.Errorf("bad file list: want\n%q\ngot\n%q", files, files2)
}
}

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import (
"internal/syscall/windows/sysdll"
"sync"
"sync/atomic"
"unsafe"
)
// DLLError describes reasons for DLL load failures.
type DLLError struct {
Err error
ObjName string
Msg string
}
func (e *DLLError) Error() string { return e.Msg }
func (e *DLLError) Unwrap() error { return e.Err }
// Implemented in ../runtime/syscall_windows.go.
// Deprecated: Use [SyscallN] instead.
func Syscall(trap, nargs, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
// Deprecated: Use [SyscallN] instead.
func Syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
// Deprecated: Use [SyscallN] instead.
func Syscall9(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
// Deprecated: Use [SyscallN] instead.
func Syscall12(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12 uintptr) (r1, r2 uintptr, err Errno)
// Deprecated: Use [SyscallN] instead.
func Syscall15(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr) (r1, r2 uintptr, err Errno)
// Deprecated: Use [SyscallN] instead.
func Syscall18(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18 uintptr) (r1, r2 uintptr, err Errno)
func SyscallN(trap uintptr, args ...uintptr) (r1, r2 uintptr, err Errno)
func loadlibrary(filename *uint16) (handle uintptr, err Errno)
func loadsystemlibrary(filename *uint16) (handle uintptr, err Errno)
func getprocaddress(handle uintptr, procname *uint8) (proc uintptr, err Errno)
// A DLL implements access to a single DLL.
type DLL struct {
Name string
Handle Handle
}
// LoadDLL loads the named DLL file into memory.
//
// If name is not an absolute path and is not a known system DLL used by
// Go, Windows will search for the named DLL in many locations, causing
// potential DLL preloading attacks.
//
// Use [LazyDLL] in golang.org/x/sys/windows for a secure way to
// load system DLLs.
func LoadDLL(name string) (*DLL, error) {
namep, err := UTF16PtrFromString(name)
if err != nil {
return nil, err
}
var h uintptr
var e Errno
if sysdll.IsSystemDLL[name] {
h, e = loadsystemlibrary(namep)
} else {
h, e = loadlibrary(namep)
}
if e != 0 {
return nil, &DLLError{
Err: e,
ObjName: name,
Msg: "Failed to load " + name + ": " + e.Error(),
}
}
d := &DLL{
Name: name,
Handle: Handle(h),
}
return d, nil
}
// MustLoadDLL is like [LoadDLL] but panics if load operation fails.
func MustLoadDLL(name string) *DLL {
d, e := LoadDLL(name)
if e != nil {
panic(e)
}
return d
}
// FindProc searches [DLL] d for procedure named name and returns [*Proc]
// if found. It returns an error if search fails.
func (d *DLL) FindProc(name string) (proc *Proc, err error) {
namep, err := BytePtrFromString(name)
if err != nil {
return nil, err
}
a, e := getprocaddress(uintptr(d.Handle), namep)
if e != 0 {
return nil, &DLLError{
Err: e,
ObjName: name,
Msg: "Failed to find " + name + " procedure in " + d.Name + ": " + e.Error(),
}
}
p := &Proc{
Dll: d,
Name: name,
addr: a,
}
return p, nil
}
// MustFindProc is like [DLL.FindProc] but panics if search fails.
func (d *DLL) MustFindProc(name string) *Proc {
p, e := d.FindProc(name)
if e != nil {
panic(e)
}
return p
}
// Release unloads [DLL] d from memory.
func (d *DLL) Release() (err error) {
return FreeLibrary(d.Handle)
}
// A Proc implements access to a procedure inside a [DLL].
type Proc struct {
Dll *DLL
Name string
addr uintptr
}
// Addr returns the address of the procedure represented by p.
// The return value can be passed to Syscall to run the procedure.
func (p *Proc) Addr() uintptr {
return p.addr
}
// Call executes procedure p with arguments a.
//
// The returned error is always non-nil, constructed from the result of GetLastError.
// Callers must inspect the primary return value to decide whether an error occurred
// (according to the semantics of the specific function being called) before consulting
// the error. The error always has type [Errno].
//
// On amd64, Call can pass and return floating-point values. To pass
// an argument x with C type "float", use
// uintptr(math.Float32bits(x)). To pass an argument with C type
// "double", use uintptr(math.Float64bits(x)). Floating-point return
// values are returned in r2. The return value for C type "float" is
// [math.Float32frombits](uint32(r2)). For C type "double", it is
// [math.Float64frombits](uint64(r2)).
//
//go:uintptrescapes
func (p *Proc) Call(a ...uintptr) (uintptr, uintptr, error) {
return SyscallN(p.Addr(), a...)
}
// A LazyDLL implements access to a single [DLL].
// It will delay the load of the DLL until the first
// call to its [LazyDLL.Handle] method or to one of its
// [LazyProc]'s Addr method.
//
// LazyDLL is subject to the same DLL preloading attacks as documented
// on [LoadDLL].
//
// Use LazyDLL in golang.org/x/sys/windows for a secure way to
// load system DLLs.
type LazyDLL struct {
mu sync.Mutex
dll *DLL // non nil once DLL is loaded
Name string
}
// Load loads DLL file d.Name into memory. It returns an error if fails.
// Load will not try to load DLL, if it is already loaded into memory.
func (d *LazyDLL) Load() error {
// Non-racy version of:
// if d.dll == nil {
if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&d.dll))) == nil {
d.mu.Lock()
defer d.mu.Unlock()
if d.dll == nil {
dll, e := LoadDLL(d.Name)
if e != nil {
return e
}
// Non-racy version of:
// d.dll = dll
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.dll)), unsafe.Pointer(dll))
}
}
return nil
}
// mustLoad is like Load but panics if search fails.
func (d *LazyDLL) mustLoad() {
e := d.Load()
if e != nil {
panic(e)
}
}
// Handle returns d's module handle.
func (d *LazyDLL) Handle() uintptr {
d.mustLoad()
return uintptr(d.dll.Handle)
}
// NewProc returns a [LazyProc] for accessing the named procedure in the [DLL] d.
func (d *LazyDLL) NewProc(name string) *LazyProc {
return &LazyProc{l: d, Name: name}
}
// NewLazyDLL creates new [LazyDLL] associated with [DLL] file.
func NewLazyDLL(name string) *LazyDLL {
return &LazyDLL{Name: name}
}
// A LazyProc implements access to a procedure inside a [LazyDLL].
// It delays the lookup until the [LazyProc.Addr], [LazyProc.Call], or [LazyProc.Find] method is called.
type LazyProc struct {
mu sync.Mutex
Name string
l *LazyDLL
proc *Proc
}
// Find searches [DLL] for procedure named p.Name. It returns
// an error if search fails. Find will not search procedure,
// if it is already found and loaded into memory.
func (p *LazyProc) Find() error {
// Non-racy version of:
// if p.proc == nil {
if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc))) == nil {
p.mu.Lock()
defer p.mu.Unlock()
if p.proc == nil {
e := p.l.Load()
if e != nil {
return e
}
proc, e := p.l.dll.FindProc(p.Name)
if e != nil {
return e
}
// Non-racy version of:
// p.proc = proc
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc)), unsafe.Pointer(proc))
}
}
return nil
}
// mustFind is like Find but panics if search fails.
func (p *LazyProc) mustFind() {
e := p.Find()
if e != nil {
panic(e)
}
}
// Addr returns the address of the procedure represented by p.
// The return value can be passed to Syscall to run the procedure.
func (p *LazyProc) Addr() uintptr {
p.mustFind()
return p.proc.Addr()
}
// Call executes procedure p with arguments a. See the documentation of
// Proc.Call for more information.
//
//go:uintptrescapes
func (p *LazyProc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
p.mustFind()
return p.proc.Call(a...)
}

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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix || (js && wasm) || plan9 || wasip1
// Unix environment variables.
package syscall
import (
"runtime"
"sync"
)
var (
// envOnce guards initialization by copyenv, which populates env.
envOnce sync.Once
// envLock guards env and envs.
envLock sync.RWMutex
// env maps from an environment variable to its first occurrence in envs.
env map[string]int
// envs is provided by the runtime. elements are expected to
// be of the form "key=value". An empty string means deleted
// (or a duplicate to be ignored).
envs []string = runtime_envs()
)
func runtime_envs() []string // in package runtime
func copyenv() {
env = make(map[string]int)
for i, s := range envs {
for j := 0; j < len(s); j++ {
if s[j] == '=' {
key := s[:j]
if _, ok := env[key]; !ok {
env[key] = i // first mention of key
} else {
// Clear duplicate keys. This permits Unsetenv to
// safely delete only the first item without
// worrying about unshadowing a later one,
// which might be a security problem.
envs[i] = ""
}
break
}
}
}
}
func Unsetenv(key string) error {
envOnce.Do(copyenv)
envLock.Lock()
defer envLock.Unlock()
if i, ok := env[key]; ok {
envs[i] = ""
delete(env, key)
}
runtimeUnsetenv(key)
return nil
}
func Getenv(key string) (value string, found bool) {
envOnce.Do(copyenv)
if len(key) == 0 {
return "", false
}
envLock.RLock()
defer envLock.RUnlock()
i, ok := env[key]
if !ok {
return "", false
}
s := envs[i]
for i := 0; i < len(s); i++ {
if s[i] == '=' {
return s[i+1:], true
}
}
return "", false
}
func Setenv(key, value string) error {
envOnce.Do(copyenv)
if len(key) == 0 {
return EINVAL
}
for i := 0; i < len(key); i++ {
if key[i] == '=' || key[i] == 0 {
return EINVAL
}
}
// On Plan 9, null is used as a separator, eg in $path.
if runtime.GOOS != "plan9" {
for i := 0; i < len(value); i++ {
if value[i] == 0 {
return EINVAL
}
}
}
envLock.Lock()
defer envLock.Unlock()
i, ok := env[key]
kv := key + "=" + value
if ok {
envs[i] = kv
} else {
i = len(envs)
envs = append(envs, kv)
}
env[key] = i
runtimeSetenv(key, value)
return nil
}
func Clearenv() {
envOnce.Do(copyenv) // prevent copyenv in Getenv/Setenv
envLock.Lock()
defer envLock.Unlock()
for k := range env {
runtimeUnsetenv(k)
}
env = make(map[string]int)
envs = []string{}
}
func Environ() []string {
envOnce.Do(copyenv)
envLock.RLock()
defer envLock.RUnlock()
a := make([]string, 0, len(envs))
for _, env := range envs {
if env != "" {
a = append(a, env)
}
}
return a
}

96
src/syscall/env_windows.go Normal file
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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Windows environment variables.
package syscall
import (
"unsafe"
)
func Getenv(key string) (value string, found bool) {
keyp, err := UTF16PtrFromString(key)
if err != nil {
return "", false
}
n := uint32(100)
for {
b := make([]uint16, n)
n, err = GetEnvironmentVariable(keyp, &b[0], uint32(len(b)))
if n == 0 && err == ERROR_ENVVAR_NOT_FOUND {
return "", false
}
if n <= uint32(len(b)) {
return UTF16ToString(b[:n]), true
}
}
}
func Setenv(key, value string) error {
v, err := UTF16PtrFromString(value)
if err != nil {
return err
}
keyp, err := UTF16PtrFromString(key)
if err != nil {
return err
}
e := SetEnvironmentVariable(keyp, v)
if e != nil {
return e
}
runtimeSetenv(key, value)
return nil
}
func Unsetenv(key string) error {
keyp, err := UTF16PtrFromString(key)
if err != nil {
return err
}
e := SetEnvironmentVariable(keyp, nil)
if e != nil {
return e
}
runtimeUnsetenv(key)
return nil
}
func Clearenv() {
for _, s := range Environ() {
// Environment variables can begin with =
// so start looking for the separator = at j=1.
// https://devblogs.microsoft.com/oldnewthing/20100506-00/?p=14133
for j := 1; j < len(s); j++ {
if s[j] == '=' {
Unsetenv(s[0:j])
break
}
}
}
}
func Environ() []string {
envp, e := GetEnvironmentStrings()
if e != nil {
return nil
}
defer FreeEnvironmentStrings(envp)
r := make([]string, 0, 50) // Empty with room to grow.
const size = unsafe.Sizeof(*envp)
for *envp != 0 { // environment block ends with empty string
// find NUL terminator
end := unsafe.Pointer(envp)
for *(*uint16)(end) != 0 {
end = unsafe.Add(end, size)
}
entry := unsafe.Slice(envp, (uintptr(end)-uintptr(unsafe.Pointer(envp)))/size)
r = append(r, UTF16ToString(entry))
envp = (*uint16)(unsafe.Add(end, size))
}
return r
}

59
src/syscall/errors_plan9.go Normal file
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
// Constants
const (
// Invented values to support what package os expects.
O_CREAT = 0x02000
O_APPEND = 0x00400
O_NOCTTY = 0x00000
O_NONBLOCK = 0x00000
O_SYNC = 0x00000
O_ASYNC = 0x00000
S_IFMT = 0x1f000
S_IFIFO = 0x1000
S_IFCHR = 0x2000
S_IFDIR = 0x4000
S_IFBLK = 0x6000
S_IFREG = 0x8000
S_IFLNK = 0xa000
S_IFSOCK = 0xc000
)
// Errors
var (
EINVAL = NewError("bad arg in system call")
ENOTDIR = NewError("not a directory")
EISDIR = NewError("file is a directory")
ENOENT = NewError("file does not exist")
EEXIST = NewError("file already exists")
EMFILE = NewError("no free file descriptors")
EIO = NewError("i/o error")
ENAMETOOLONG = NewError("file name too long")
EINTR = NewError("interrupted")
EPERM = NewError("permission denied")
EBUSY = NewError("no free devices")
ETIMEDOUT = NewError("connection timed out")
EPLAN9 = NewError("not supported by plan 9")
// The following errors do not correspond to any
// Plan 9 system messages. Invented to support
// what package os and others expect.
EACCES = NewError("access permission denied")
EAFNOSUPPORT = NewError("address family not supported by protocol")
ESPIPE = NewError("illegal seek")
)
// Notes
const (
SIGABRT = Note("abort")
SIGALRM = Note("alarm")
SIGHUP = Note("hangup")
SIGINT = Note("interrupt")
SIGKILL = Note("kill")
SIGTERM = Note("interrupt")
)

46
src/syscall/exec_aix_test.go Normal file
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix
package syscall
import "unsafe"
//go:cgo_import_dynamic libc_Getpgid getpgid "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Getpgrp getpgrp "libc.a/shr_64.o"
//go:linkname libc_Getpgid libc_Getpgid
//go:linkname libc_Getpgrp libc_Getpgrp
var (
libc_Getpgid,
libc_Getpgrp libcFunc
)
func Getpgid(pid int) (pgid int, err error) {
r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_Getpgid)), 1, uintptr(pid), 0, 0, 0, 0, 0)
pgid = int(r0)
if e1 != 0 {
err = e1
}
return
}
func Getpgrp() (pgrp int) {
r0, _, _ := syscall6(uintptr(unsafe.Pointer(&libc_Getpgrp)), 0, 0, 0, 0, 0, 0, 0)
pgrp = int(r0)
return
}
func Tcgetpgrp(fd int) (pgid int32, err error) {
if errno := ioctlPtr(uintptr(fd), TIOCGPGRP, unsafe.Pointer(&pgid)); errno != 0 {
return -1, errno
}
return pgid, nil
}
func Tcsetpgrp(fd int, pgid int32) (err error) {
return ioctlPtr(uintptr(fd), TIOCSPGRP, unsafe.Pointer(&pgid))
}

300
src/syscall/exec_bsd.go Normal file
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build dragonfly || netbsd || (openbsd && mips64)
package syscall
import (
"runtime"
"unsafe"
)
type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
Ptrace bool // Enable tracing.
Setsid bool // Create session.
// Setpgid sets the process group ID of the child to Pgid,
// or, if Pgid == 0, to the new child's process ID.
Setpgid bool
// Setctty sets the controlling terminal of the child to
// file descriptor Ctty. Ctty must be a descriptor number
// in the child process: an index into ProcAttr.Files.
// This is only meaningful if Setsid is true.
Setctty bool
Noctty bool // Detach fd 0 from controlling terminal
Ctty int // Controlling TTY fd
// Foreground places the child process group in the foreground.
// This implies Setpgid. The Ctty field must be set to
// the descriptor of the controlling TTY.
// Unlike Setctty, in this case Ctty must be a descriptor
// number in the parent process.
Foreground bool
Pgid int // Child's process group ID if Setpgid.
}
// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// For the same reason compiler does not race instrument it.
// The calls to RawSyscall are okay because they are assembly
// functions that do not grow the stack.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
// Declare all variables at top in case any
// declarations require heap allocation (e.g., err1).
var (
r1 uintptr
err1 Errno
nextfd int
i int
pgrp _C_int
cred *Credential
ngroups, groups uintptr
)
rlim := origRlimitNofile.Load()
// guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
// About to call fork.
// No more allocation or calls of non-assembly functions.
runtime_BeforeFork()
r1, _, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
if err1 != 0 {
runtime_AfterFork()
return 0, err1
}
if r1 != 0 {
// parent; return PID
runtime_AfterFork()
return int(r1), 0
}
// Fork succeeded, now in child.
// Enable tracing if requested.
if sys.Ptrace {
_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Session ID
if sys.Setsid {
_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
// Set process group
if sys.Setpgid || sys.Foreground {
// Place child in process group.
_, _, err1 = RawSyscall(SYS_SETPGID, 0, uintptr(sys.Pgid), 0)
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
// This should really be pid_t, however _C_int (aka int32) is
// generally equivalent.
pgrp = _C_int(sys.Pgid)
if pgrp == 0 {
r1, _, err1 = RawSyscall(SYS_GETPID, 0, 0, 0)
if err1 != 0 {
goto childerror
}
pgrp = _C_int(r1)
}
// Place process group in foreground.
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
}
// Restore the signal mask. We do this after TIOCSPGRP to avoid
// having the kernel send a SIGTTOU signal to the process group.
runtime_AfterForkInChild()
// Chroot
if chroot != nil {
_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// User and groups
if cred = sys.Credential; cred != nil {
ngroups = uintptr(len(cred.Groups))
groups = uintptr(0)
if ngroups > 0 {
groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
}
if !cred.NoSetGroups {
_, _, err1 = RawSyscall(SYS_SETGROUPS, ngroups, groups, 0)
if err1 != 0 {
goto childerror
}
}
_, _, err1 = RawSyscall(SYS_SETGID, uintptr(cred.Gid), 0, 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = RawSyscall(SYS_SETUID, uintptr(cred.Uid), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Chdir
if dir != nil {
_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
if runtime.GOOS == "netbsd" || (runtime.GOOS == "openbsd" && runtime.GOARCH == "mips64") {
_, _, err1 = RawSyscall(_SYS_DUP3, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
} else if runtime.GOOS == "dragonfly" {
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(pipe), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
} else {
_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
if runtime.GOOS == "netbsd" || (runtime.GOOS == "openbsd" && runtime.GOARCH == "mips64") {
_, _, err1 = RawSyscall(_SYS_DUP3, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
} else if runtime.GOOS == "dragonfly" {
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
} else {
_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(nextfd), 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
continue
}
if fd[i] == i {
// dup2(i, i) won't clear close-on-exec flag on Linux,
// probably not elsewhere either.
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
continue
}
// The new fd is created NOT close-on-exec,
// which is exactly what we want.
_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(i), 0)
if err1 != 0 {
goto childerror
}
}
// By convention, we don't close-on-exec the fds we are
// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
// Programs that know they inherit fds >= 3 will need
// to set them close-on-exec.
for i = len(fd); i < 3; i++ {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
}
// Detach fd 0 from tty
if sys.Noctty {
_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Set the controlling TTY to Ctty
if sys.Setctty {
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Restore original rlimit.
if rlim != nil {
RawSyscall(SYS_SETRLIMIT, uintptr(RLIMIT_NOFILE), uintptr(unsafe.Pointer(rlim)), 0)
}
// Time to exec.
_, _, err1 = RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])),
uintptr(unsafe.Pointer(&envv[0])))
childerror:
// send error code on pipe
RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
for {
RawSyscall(SYS_EXIT, 253, 0, 0)
}
}
// forkAndExecFailureCleanup cleans up after an exec failure.
func forkAndExecFailureCleanup(attr *ProcAttr, sys *SysProcAttr) {
// Nothing to do.
}

324
src/syscall/exec_freebsd.go Normal file
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import (
"runtime"
"unsafe"
)
type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
Ptrace bool // Enable tracing.
Setsid bool // Create session.
// Setpgid sets the process group ID of the child to Pgid,
// or, if Pgid == 0, to the new child's process ID.
Setpgid bool
// Setctty sets the controlling terminal of the child to
// file descriptor Ctty. Ctty must be a descriptor number
// in the child process: an index into ProcAttr.Files.
// This is only meaningful if Setsid is true.
Setctty bool
Noctty bool // Detach fd 0 from controlling terminal
Ctty int // Controlling TTY fd
// Foreground places the child process group in the foreground.
// This implies Setpgid. The Ctty field must be set to
// the descriptor of the controlling TTY.
// Unlike Setctty, in this case Ctty must be a descriptor
// number in the parent process.
Foreground bool
Pgid int // Child's process group ID if Setpgid.
Pdeathsig Signal // Signal that the process will get when its parent dies (Linux and FreeBSD only)
Jail int // Jail to which the child process is attached (FreeBSD only).
}
const (
_P_PID = 0
_PROC_PDEATHSIG_CTL = 11
)
// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// For the same reason compiler does not race instrument it.
// The calls to RawSyscall are okay because they are assembly
// functions that do not grow the stack.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
// Declare all variables at top in case any
// declarations require heap allocation (e.g., err1).
var (
r1 uintptr
err1 Errno
nextfd int
i int
pgrp _C_int
cred *Credential
ngroups, groups uintptr
upid uintptr
)
rlim := origRlimitNofile.Load()
// Record parent PID so child can test if it has died.
ppid, _, _ := RawSyscall(SYS_GETPID, 0, 0, 0)
// guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
// About to call fork.
// No more allocation or calls of non-assembly functions.
runtime_BeforeFork()
r1, _, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
if err1 != 0 {
runtime_AfterFork()
return 0, err1
}
if r1 != 0 {
// parent; return PID
runtime_AfterFork()
return int(r1), 0
}
// Fork succeeded, now in child.
// Attach to the given jail, if any. The system call also changes the
// process' root and working directories to the jail's path directory.
if sys.Jail > 0 {
_, _, err1 = RawSyscall(SYS_JAIL_ATTACH, uintptr(sys.Jail), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Enable tracing if requested.
if sys.Ptrace {
_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Session ID
if sys.Setsid {
_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
// Set process group
if sys.Setpgid || sys.Foreground {
// Place child in process group.
_, _, err1 = RawSyscall(SYS_SETPGID, 0, uintptr(sys.Pgid), 0)
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
// This should really be pid_t, however _C_int (aka int32) is
// generally equivalent.
pgrp = _C_int(sys.Pgid)
if pgrp == 0 {
r1, _, err1 = RawSyscall(SYS_GETPID, 0, 0, 0)
if err1 != 0 {
goto childerror
}
pgrp = _C_int(r1)
}
// Place process group in foreground.
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
}
// Restore the signal mask. We do this after TIOCSPGRP to avoid
// having the kernel send a SIGTTOU signal to the process group.
runtime_AfterForkInChild()
// Chroot
if chroot != nil {
_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// User and groups
if cred = sys.Credential; cred != nil {
ngroups = uintptr(len(cred.Groups))
groups = uintptr(0)
if ngroups > 0 {
groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
}
if !cred.NoSetGroups {
_, _, err1 = RawSyscall(SYS_SETGROUPS, ngroups, groups, 0)
if err1 != 0 {
goto childerror
}
}
_, _, err1 = RawSyscall(SYS_SETGID, uintptr(cred.Gid), 0, 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = RawSyscall(SYS_SETUID, uintptr(cred.Uid), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Chdir
if dir != nil {
_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Parent death signal
if sys.Pdeathsig != 0 {
switch runtime.GOARCH {
case "386", "arm":
_, _, err1 = RawSyscall6(SYS_PROCCTL, _P_PID, 0, 0, _PROC_PDEATHSIG_CTL, uintptr(unsafe.Pointer(&sys.Pdeathsig)), 0)
default:
_, _, err1 = RawSyscall6(SYS_PROCCTL, _P_PID, 0, _PROC_PDEATHSIG_CTL, uintptr(unsafe.Pointer(&sys.Pdeathsig)), 0, 0)
}
if err1 != 0 {
goto childerror
}
// Signal self if parent is already dead. This might cause a
// duplicate signal in rare cases, but it won't matter when
// using SIGKILL.
r1, _, _ = RawSyscall(SYS_GETPPID, 0, 0, 0)
if r1 != ppid {
upid, _, _ = RawSyscall(SYS_GETPID, 0, 0, 0)
_, _, err1 = RawSyscall(SYS_KILL, upid, uintptr(sys.Pdeathsig), 0)
if err1 != 0 {
goto childerror
}
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(pipe), F_DUP2FD_CLOEXEC, uintptr(nextfd))
if err1 != 0 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_DUP2FD_CLOEXEC, uintptr(nextfd))
if err1 != 0 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
continue
}
if fd[i] == i {
// dup2(i, i) won't clear close-on-exec flag on Linux,
// probably not elsewhere either.
_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
continue
}
// The new fd is created NOT close-on-exec,
// which is exactly what we want.
_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(i), 0)
if err1 != 0 {
goto childerror
}
}
// By convention, we don't close-on-exec the fds we are
// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
// Programs that know they inherit fds >= 3 will need
// to set them close-on-exec.
for i = len(fd); i < 3; i++ {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
}
// Detach fd 0 from tty
if sys.Noctty {
_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Set the controlling TTY to Ctty
if sys.Setctty {
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Restore original rlimit.
if rlim != nil {
RawSyscall(SYS_SETRLIMIT, uintptr(RLIMIT_NOFILE), uintptr(unsafe.Pointer(rlim)), 0)
}
// Time to exec.
_, _, err1 = RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])),
uintptr(unsafe.Pointer(&envv[0])))
childerror:
// send error code on pipe
RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
for {
RawSyscall(SYS_EXIT, 253, 0, 0)
}
}
// forkAndExecFailureCleanup cleans up after an exec failure.
func forkAndExecFailureCleanup(attr *ProcAttr, sys *SysProcAttr) {
// Nothing to do.
}

98
src/syscall/exec_freebsd_test.go Normal file
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@@ -0,0 +1,98 @@
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build freebsd
package syscall_test
import (
"fmt"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"syscall"
"testing"
"unsafe"
)
const (
flagJailCreate = uintptr(0x1)
)
func prepareJail(t *testing.T) (int, string) {
t.Helper()
root := t.TempDir()
paramPath := []byte("path\x00")
conf := make([]syscall.Iovec, 4)
conf[0].Base = &paramPath[0]
conf[0].SetLen(len(paramPath))
p, err := syscall.BytePtrFromString(root)
if err != nil {
t.Fatal(err)
}
conf[1].Base = p
conf[1].SetLen(len(root) + 1)
paramPersist := []byte("persist\x00")
conf[2].Base = &paramPersist[0]
conf[2].SetLen(len(paramPersist))
conf[3].Base = nil
conf[3].SetLen(0)
id, _, err1 := syscall.Syscall(syscall.SYS_JAIL_SET,
uintptr(unsafe.Pointer(&conf[0])), uintptr(len(conf)), flagJailCreate)
if err1 != 0 {
t.Fatalf("jail_set: %v", err1)
}
t.Cleanup(func() {
_, _, err1 := syscall.Syscall(syscall.SYS_JAIL_REMOVE, id, 0, 0)
if err1 != 0 {
t.Errorf("failed to cleanup jail: %v", err)
}
})
return int(id), root
}
func TestJailAttach(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
jailed, err := syscall.SysctlUint32("security.jail.jailed")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if jailed != 1 {
t.Fatalf("jailed = %d, want 1", jailed)
}
return
}
testenv.MustHaveGoBuild(t)
// Make sure we are running as root, so we have permissions to create
// and remove jails.
if os.Getuid() != 0 {
t.Skip("kernel prohibits jail system calls in unprivileged process")
}
jid, root := prepareJail(t)
// Since jail attach does an implicit chroot to the jail's path,
// we need the binary there, and it must be statically linked.
x := filepath.Join(root, "syscall.test")
cmd := exec.Command(testenv.GoToolPath(t), "test", "-c", "-o", x, "syscall")
cmd.Env = append(os.Environ(), "CGO_ENABLED=0")
if o, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("Build of syscall in jail root failed, output %v, err %v", o, err)
}
cmd = exec.Command("/syscall.test", "-test.run=TestJailAttach", "/")
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{Jail: jid}
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
}

324
src/syscall/exec_libc.go Normal file
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@@ -0,0 +1,324 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || solaris
// This file handles forkAndExecInChild function for OS using libc syscall like AIX or Solaris.
package syscall
import (
"runtime"
"unsafe"
)
type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
Setsid bool // Create session.
// Setpgid sets the process group ID of the child to Pgid,
// or, if Pgid == 0, to the new child's process ID.
Setpgid bool
// Setctty sets the controlling terminal of the child to
// file descriptor Ctty. Ctty must be a descriptor number
// in the child process: an index into ProcAttr.Files.
// This is only meaningful if Setsid is true.
Setctty bool
Noctty bool // Detach fd 0 from controlling terminal
Ctty int // Controlling TTY fd
// Foreground places the child process group in the foreground.
// This implies Setpgid. The Ctty field must be set to
// the descriptor of the controlling TTY.
// Unlike Setctty, in this case Ctty must be a descriptor
// number in the parent process.
Foreground bool
Pgid int // Child's process group ID if Setpgid.
}
// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()
func chdir(path uintptr) (err Errno)
func chroot1(path uintptr) (err Errno)
func closeFD(fd uintptr) (err Errno)
func dup2child(old uintptr, new uintptr) (val uintptr, err Errno)
func execve(path uintptr, argv uintptr, envp uintptr) (err Errno)
func exit(code uintptr)
func fcntl1(fd uintptr, cmd uintptr, arg uintptr) (val uintptr, err Errno)
func forkx(flags uintptr) (pid uintptr, err Errno)
func getpid() (pid uintptr, err Errno)
func ioctl(fd uintptr, req uintptr, arg uintptr) (err Errno)
func setgid(gid uintptr) (err Errno)
func setgroups1(ngid uintptr, gid uintptr) (err Errno)
func setrlimit1(which uintptr, lim unsafe.Pointer) (err Errno)
func setsid() (pid uintptr, err Errno)
func setuid(uid uintptr) (err Errno)
func setpgid(pid uintptr, pgid uintptr) (err Errno)
func write1(fd uintptr, buf uintptr, nbyte uintptr) (n uintptr, err Errno)
// syscall defines this global on our behalf to avoid a build dependency on other platforms
func init() {
execveLibc = execve
}
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
//
// We call hand-crafted syscalls, implemented in
// ../runtime/syscall_solaris.go, rather than generated libc wrappers
// because we need to avoid lazy-loading the functions (might malloc,
// split the stack, or acquire mutexes). We can't call RawSyscall
// because it's not safe even for BSD-subsystem calls.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
// Declare all variables at top in case any
// declarations require heap allocation (e.g., err1).
var (
r1 uintptr
err1 Errno
nextfd int
i int
pgrp _Pid_t
cred *Credential
ngroups, groups uintptr
)
rlim := origRlimitNofile.Load()
// guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
// About to call fork.
// No more allocation or calls of non-assembly functions.
runtime_BeforeFork()
r1, err1 = forkx(0x1) // FORK_NOSIGCHLD
if err1 != 0 {
runtime_AfterFork()
return 0, err1
}
if r1 != 0 {
// parent; return PID
runtime_AfterFork()
return int(r1), 0
}
// Fork succeeded, now in child.
// Session ID
if sys.Setsid {
_, err1 = setsid()
if err1 != 0 {
goto childerror
}
}
// Set process group
if sys.Setpgid || sys.Foreground {
// Place child in process group.
err1 = setpgid(0, uintptr(sys.Pgid))
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
pgrp = _Pid_t(sys.Pgid)
if pgrp == 0 {
r1, err1 = getpid()
if err1 != 0 {
goto childerror
}
pgrp = _Pid_t(r1)
}
// Place process group in foreground.
err1 = ioctl(uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
}
// Restore the signal mask. We do this after TIOCSPGRP to avoid
// having the kernel send a SIGTTOU signal to the process group.
runtime_AfterForkInChild()
// Chroot
if chroot != nil {
err1 = chroot1(uintptr(unsafe.Pointer(chroot)))
if err1 != 0 {
goto childerror
}
}
// User and groups
if cred = sys.Credential; cred != nil {
ngroups = uintptr(len(cred.Groups))
groups = uintptr(0)
if ngroups > 0 {
groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
}
if !cred.NoSetGroups {
err1 = setgroups1(ngroups, groups)
if err1 != 0 {
goto childerror
}
}
err1 = setgid(uintptr(cred.Gid))
if err1 != 0 {
goto childerror
}
err1 = setuid(uintptr(cred.Uid))
if err1 != 0 {
goto childerror
}
}
// Chdir
if dir != nil {
err1 = chdir(uintptr(unsafe.Pointer(dir)))
if err1 != 0 {
goto childerror
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
switch runtime.GOOS {
case "illumos", "solaris":
_, err1 = fcntl1(uintptr(pipe), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
default:
_, err1 = dup2child(uintptr(pipe), uintptr(nextfd))
if err1 != 0 {
goto childerror
}
_, err1 = fcntl1(uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
switch runtime.GOOS {
case "illumos", "solaris":
_, err1 = fcntl1(uintptr(fd[i]), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
default:
_, err1 = dup2child(uintptr(fd[i]), uintptr(nextfd))
if err1 != 0 {
goto childerror
}
_, err1 = fcntl1(uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
closeFD(uintptr(i))
continue
}
if fd[i] == i {
// dup2(i, i) won't clear close-on-exec flag on Linux,
// probably not elsewhere either.
_, err1 = fcntl1(uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
continue
}
// The new fd is created NOT close-on-exec,
// which is exactly what we want.
_, err1 = dup2child(uintptr(fd[i]), uintptr(i))
if err1 != 0 {
goto childerror
}
}
// By convention, we don't close-on-exec the fds we are
// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
// Programs that know they inherit fds >= 3 will need
// to set them close-on-exec.
for i = len(fd); i < 3; i++ {
closeFD(uintptr(i))
}
// Detach fd 0 from tty
if sys.Noctty {
err1 = ioctl(0, uintptr(TIOCNOTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Set the controlling TTY to Ctty
if sys.Setctty {
// On AIX, TIOCSCTTY is undefined
if TIOCSCTTY == 0 {
err1 = ENOSYS
goto childerror
}
err1 = ioctl(uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Restore original rlimit.
if rlim != nil {
setrlimit1(RLIMIT_NOFILE, unsafe.Pointer(rlim))
}
// Time to exec.
err1 = execve(
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])),
uintptr(unsafe.Pointer(&envv[0])))
childerror:
// send error code on pipe
write1(uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
for {
exit(253)
}
}
// forkAndExecFailureCleanup cleans up after an exec failure.
func forkAndExecFailureCleanup(attr *ProcAttr, sys *SysProcAttr) {
// Nothing to do.
}
func ioctlPtr(fd, req uintptr, arg unsafe.Pointer) (err Errno) {
return ioctl(fd, req, uintptr(arg))
}

296
src/syscall/exec_libc2.go Normal file
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@@ -0,0 +1,296 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || (openbsd && !mips64)
package syscall
import (
"internal/abi"
"runtime"
"unsafe"
)
type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
Ptrace bool // Enable tracing.
Setsid bool // Create session.
// Setpgid sets the process group ID of the child to Pgid,
// or, if Pgid == 0, to the new child's process ID.
Setpgid bool
// Setctty sets the controlling terminal of the child to
// file descriptor Ctty. Ctty must be a descriptor number
// in the child process: an index into ProcAttr.Files.
// This is only meaningful if Setsid is true.
Setctty bool
Noctty bool // Detach fd 0 from controlling terminal
Ctty int // Controlling TTY fd
// Foreground places the child process group in the foreground.
// This implies Setpgid. The Ctty field must be set to
// the descriptor of the controlling TTY.
// Unlike Setctty, in this case Ctty must be a descriptor
// number in the parent process.
Foreground bool
Pgid int // Child's process group ID if Setpgid.
}
// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// For the same reason compiler does not race instrument it.
// The calls to rawSyscall are okay because they are assembly
// functions that do not grow the stack.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err1 Errno) {
// Declare all variables at top in case any
// declarations require heap allocation (e.g., err1).
var (
r1 uintptr
nextfd int
i int
err error
pgrp _C_int
cred *Credential
ngroups, groups uintptr
)
rlim := origRlimitNofile.Load()
// guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
// About to call fork.
// No more allocation or calls of non-assembly functions.
runtime_BeforeFork()
r1, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fork_trampoline), 0, 0, 0)
if err1 != 0 {
runtime_AfterFork()
return 0, err1
}
if r1 != 0 {
// parent; return PID
runtime_AfterFork()
return int(r1), 0
}
// Fork succeeded, now in child.
// Enable tracing if requested.
if sys.Ptrace {
if err = ptrace(PTRACE_TRACEME, 0, 0, 0); err != nil {
err1 = err.(Errno)
goto childerror
}
}
// Session ID
if sys.Setsid {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setsid_trampoline), 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
// Set process group
if sys.Setpgid || sys.Foreground {
// Place child in process group.
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setpgid_trampoline), 0, uintptr(sys.Pgid), 0)
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
// This should really be pid_t, however _C_int (aka int32) is
// generally equivalent.
pgrp = _C_int(sys.Pgid)
if pgrp == 0 {
r1, _, err1 = rawSyscall(abi.FuncPCABI0(libc_getpid_trampoline), 0, 0, 0)
if err1 != 0 {
goto childerror
}
pgrp = _C_int(r1)
}
// Place process group in foreground.
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
}
// Restore the signal mask. We do this after TIOCSPGRP to avoid
// having the kernel send a SIGTTOU signal to the process group.
runtime_AfterForkInChild()
// Chroot
if chroot != nil {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_chroot_trampoline), uintptr(unsafe.Pointer(chroot)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// User and groups
if cred = sys.Credential; cred != nil {
ngroups = uintptr(len(cred.Groups))
groups = uintptr(0)
if ngroups > 0 {
groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
}
if !cred.NoSetGroups {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgroups_trampoline), ngroups, groups, 0)
if err1 != 0 {
goto childerror
}
}
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgid_trampoline), uintptr(cred.Gid), 0, 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setuid_trampoline), uintptr(cred.Uid), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Chdir
if dir != nil {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_chdir_trampoline), uintptr(unsafe.Pointer(dir)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
if runtime.GOOS == "openbsd" {
_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
} else {
_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
if runtime.GOOS == "openbsd" {
_, _, err1 = rawSyscall(dupTrampoline, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
} else {
_, _, err1 = rawSyscall(dupTrampoline, uintptr(fd[i]), uintptr(nextfd), 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
}
if err1 != 0 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
rawSyscall(abi.FuncPCABI0(libc_close_trampoline), uintptr(i), 0, 0)
continue
}
if fd[i] == i {
// dup2(i, i) won't clear close-on-exec flag on Linux,
// probably not elsewhere either.
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
continue
}
// The new fd is created NOT close-on-exec,
// which is exactly what we want.
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_dup2_trampoline), uintptr(fd[i]), uintptr(i), 0)
if err1 != 0 {
goto childerror
}
}
// By convention, we don't close-on-exec the fds we are
// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
// Programs that know they inherit fds >= 3 will need
// to set them close-on-exec.
for i = len(fd); i < 3; i++ {
rawSyscall(abi.FuncPCABI0(libc_close_trampoline), uintptr(i), 0, 0)
}
// Detach fd 0 from tty
if sys.Noctty {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), 0, uintptr(TIOCNOTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Set the controlling TTY to Ctty
if sys.Setctty {
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Restore original rlimit.
if rlim != nil {
rawSyscall(abi.FuncPCABI0(libc_setrlimit_trampoline), uintptr(RLIMIT_NOFILE), uintptr(unsafe.Pointer(rlim)), 0)
}
// Time to exec.
_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_execve_trampoline),
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])),
uintptr(unsafe.Pointer(&envv[0])))
childerror:
// send error code on pipe
rawSyscall(abi.FuncPCABI0(libc_write_trampoline), uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
for {
rawSyscall(abi.FuncPCABI0(libc_exit_trampoline), 253, 0, 0)
}
}
// forkAndExecFailureCleanup cleans up after an exec failure.
func forkAndExecFailureCleanup(attr *ProcAttr, sys *SysProcAttr) {
// Nothing to do.
}

745
src/syscall/exec_linux.go Normal file
View File

@@ -0,0 +1,745 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
package syscall
import (
"internal/itoa"
"runtime"
"unsafe"
)
// Linux unshare/clone/clone2/clone3 flags, architecture-independent,
// copied from linux/sched.h.
const (
CLONE_VM = 0x00000100 // set if VM shared between processes
CLONE_FS = 0x00000200 // set if fs info shared between processes
CLONE_FILES = 0x00000400 // set if open files shared between processes
CLONE_SIGHAND = 0x00000800 // set if signal handlers and blocked signals shared
CLONE_PIDFD = 0x00001000 // set if a pidfd should be placed in parent
CLONE_PTRACE = 0x00002000 // set if we want to let tracing continue on the child too
CLONE_VFORK = 0x00004000 // set if the parent wants the child to wake it up on mm_release
CLONE_PARENT = 0x00008000 // set if we want to have the same parent as the cloner
CLONE_THREAD = 0x00010000 // Same thread group?
CLONE_NEWNS = 0x00020000 // New mount namespace group
CLONE_SYSVSEM = 0x00040000 // share system V SEM_UNDO semantics
CLONE_SETTLS = 0x00080000 // create a new TLS for the child
CLONE_PARENT_SETTID = 0x00100000 // set the TID in the parent
CLONE_CHILD_CLEARTID = 0x00200000 // clear the TID in the child
CLONE_DETACHED = 0x00400000 // Unused, ignored
CLONE_UNTRACED = 0x00800000 // set if the tracing process can't force CLONE_PTRACE on this clone
CLONE_CHILD_SETTID = 0x01000000 // set the TID in the child
CLONE_NEWCGROUP = 0x02000000 // New cgroup namespace
CLONE_NEWUTS = 0x04000000 // New utsname namespace
CLONE_NEWIPC = 0x08000000 // New ipc namespace
CLONE_NEWUSER = 0x10000000 // New user namespace
CLONE_NEWPID = 0x20000000 // New pid namespace
CLONE_NEWNET = 0x40000000 // New network namespace
CLONE_IO = 0x80000000 // Clone io context
// Flags for the clone3() syscall.
CLONE_CLEAR_SIGHAND = 0x100000000 // Clear any signal handler and reset to SIG_DFL.
CLONE_INTO_CGROUP = 0x200000000 // Clone into a specific cgroup given the right permissions.
// Cloning flags intersect with CSIGNAL so can be used with unshare and clone3
// syscalls only:
CLONE_NEWTIME = 0x00000080 // New time namespace
)
// SysProcIDMap holds Container ID to Host ID mappings used for User Namespaces in Linux.
// See user_namespaces(7).
//
// Note that User Namespaces are not available on a number of popular Linux
// versions (due to security issues), or are available but subject to AppArmor
// restrictions like in Ubuntu 24.04.
type SysProcIDMap struct {
ContainerID int // Container ID.
HostID int // Host ID.
Size int // Size.
}
type SysProcAttr struct {
Chroot string // Chroot.
Credential *Credential // Credential.
// Ptrace tells the child to call ptrace(PTRACE_TRACEME).
// Call runtime.LockOSThread before starting a process with this set,
// and don't call UnlockOSThread until done with PtraceSyscall calls.
Ptrace bool
Setsid bool // Create session.
// Setpgid sets the process group ID of the child to Pgid,
// or, if Pgid == 0, to the new child's process ID.
Setpgid bool
// Setctty sets the controlling terminal of the child to
// file descriptor Ctty. Ctty must be a descriptor number
// in the child process: an index into ProcAttr.Files.
// This is only meaningful if Setsid is true.
Setctty bool
Noctty bool // Detach fd 0 from controlling terminal.
Ctty int // Controlling TTY fd.
// Foreground places the child process group in the foreground.
// This implies Setpgid. The Ctty field must be set to
// the descriptor of the controlling TTY.
// Unlike Setctty, in this case Ctty must be a descriptor
// number in the parent process.
Foreground bool
Pgid int // Child's process group ID if Setpgid.
// Pdeathsig, if non-zero, is a signal that the kernel will send to
// the child process when the creating thread dies. Note that the signal
// is sent on thread termination, which may happen before process termination.
// There are more details at https://go.dev/issue/27505.
Pdeathsig Signal
Cloneflags uintptr // Flags for clone calls.
Unshareflags uintptr // Flags for unshare calls.
UidMappings []SysProcIDMap // User ID mappings for user namespaces.
GidMappings []SysProcIDMap // Group ID mappings for user namespaces.
// GidMappingsEnableSetgroups enabling setgroups syscall.
// If false, then setgroups syscall will be disabled for the child process.
// This parameter is no-op if GidMappings == nil. Otherwise for unprivileged
// users this should be set to false for mappings work.
GidMappingsEnableSetgroups bool
AmbientCaps []uintptr // Ambient capabilities.
UseCgroupFD bool // Whether to make use of the CgroupFD field.
CgroupFD int // File descriptor of a cgroup to put the new process into.
// PidFD, if not nil, is used to store the pidfd of a child, if the
// functionality is supported by the kernel, or -1. Note *PidFD is
// changed only if the process starts successfully.
PidFD *int
}
var (
none = [...]byte{'n', 'o', 'n', 'e', 0}
slash = [...]byte{'/', 0}
forceClone3 = false // Used by unit tests only.
)
// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// For the same reason compiler does not race instrument it.
// The calls to RawSyscall are okay because they are assembly
// functions that do not grow the stack.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
// Set up and fork. This returns immediately in the parent or
// if there's an error.
upid, pidfd, err, mapPipe, locked := forkAndExecInChild1(argv0, argv, envv, chroot, dir, attr, sys, pipe)
if locked {
runtime_AfterFork()
}
if err != 0 {
return 0, err
}
// parent; return PID
pid = int(upid)
if sys.PidFD != nil {
*sys.PidFD = int(pidfd)
}
if sys.UidMappings != nil || sys.GidMappings != nil {
Close(mapPipe[0])
var err2 Errno
// uid/gid mappings will be written after fork and unshare(2) for user
// namespaces.
if sys.Unshareflags&CLONE_NEWUSER == 0 {
if err := writeUidGidMappings(pid, sys); err != nil {
err2 = err.(Errno)
}
}
RawSyscall(SYS_WRITE, uintptr(mapPipe[1]), uintptr(unsafe.Pointer(&err2)), unsafe.Sizeof(err2))
Close(mapPipe[1])
}
return pid, 0
}
const _LINUX_CAPABILITY_VERSION_3 = 0x20080522
type capHeader struct {
version uint32
pid int32
}
type capData struct {
effective uint32
permitted uint32
inheritable uint32
}
type caps struct {
hdr capHeader
data [2]capData
}
// See CAP_TO_INDEX in linux/capability.h:
func capToIndex(cap uintptr) uintptr { return cap >> 5 }
// See CAP_TO_MASK in linux/capability.h:
func capToMask(cap uintptr) uint32 { return 1 << uint(cap&31) }
// cloneArgs holds arguments for clone3 Linux syscall.
type cloneArgs struct {
flags uint64 // Flags bit mask
pidFD uint64 // Where to store PID file descriptor (int *)
childTID uint64 // Where to store child TID, in child's memory (pid_t *)
parentTID uint64 // Where to store child TID, in parent's memory (pid_t *)
exitSignal uint64 // Signal to deliver to parent on child termination
stack uint64 // Pointer to lowest byte of stack
stackSize uint64 // Size of stack
tls uint64 // Location of new TLS
setTID uint64 // Pointer to a pid_t array (since Linux 5.5)
setTIDSize uint64 // Number of elements in set_tid (since Linux 5.5)
cgroup uint64 // File descriptor for target cgroup of child (since Linux 5.7)
}
// forkAndExecInChild1 implements the body of forkAndExecInChild up to
// the parent's post-fork path. This is a separate function so we can
// separate the child's and parent's stack frames if we're using
// vfork.
//
// This is go:noinline because the point is to keep the stack frames
// of this and forkAndExecInChild separate.
//
//go:noinline
//go:norace
//go:nocheckptr
func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid uintptr, pidfd int32, err1 Errno, mapPipe [2]int, locked bool) {
// Defined in linux/prctl.h starting with Linux 4.3.
const (
PR_CAP_AMBIENT = 0x2f
PR_CAP_AMBIENT_RAISE = 0x2
)
// vfork requires that the child not touch any of the parent's
// active stack frames. Hence, the child does all post-fork
// processing in this stack frame and never returns, while the
// parent returns immediately from this frame and does all
// post-fork processing in the outer frame.
//
// Declare all variables at top in case any
// declarations require heap allocation (e.g., err2).
// ":=" should not be used to declare any variable after
// the call to runtime_BeforeFork.
//
// NOTE(bcmills): The allocation behavior described in the above comment
// seems to lack a corresponding test, and it may be rendered invalid
// by an otherwise-correct change in the compiler.
var (
err2 Errno
nextfd int
i int
caps caps
fd1, flags uintptr
puid, psetgroups, pgid []byte
uidmap, setgroups, gidmap []byte
clone3 *cloneArgs
pgrp int32
dirfd int
cred *Credential
ngroups, groups uintptr
c uintptr
)
pidfd = -1
rlim := origRlimitNofile.Load()
if sys.UidMappings != nil {
puid = []byte("/proc/self/uid_map\000")
uidmap = formatIDMappings(sys.UidMappings)
}
if sys.GidMappings != nil {
psetgroups = []byte("/proc/self/setgroups\000")
pgid = []byte("/proc/self/gid_map\000")
if sys.GidMappingsEnableSetgroups {
setgroups = []byte("allow\000")
} else {
setgroups = []byte("deny\000")
}
gidmap = formatIDMappings(sys.GidMappings)
}
// Record parent PID so child can test if it has died.
ppid, _ := rawSyscallNoError(SYS_GETPID, 0, 0, 0)
// Guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
// Allocate another pipe for parent to child communication for
// synchronizing writing of User ID/Group ID mappings.
if sys.UidMappings != nil || sys.GidMappings != nil {
if err := forkExecPipe(mapPipe[:]); err != nil {
err1 = err.(Errno)
return
}
}
flags = sys.Cloneflags
if sys.Cloneflags&CLONE_NEWUSER == 0 && sys.Unshareflags&CLONE_NEWUSER == 0 {
flags |= CLONE_VFORK | CLONE_VM
}
if sys.PidFD != nil {
flags |= CLONE_PIDFD
}
// Whether to use clone3.
if sys.UseCgroupFD || flags&CLONE_NEWTIME != 0 || forceClone3 {
clone3 = &cloneArgs{
flags: uint64(flags),
exitSignal: uint64(SIGCHLD),
}
if sys.UseCgroupFD {
clone3.flags |= CLONE_INTO_CGROUP
clone3.cgroup = uint64(sys.CgroupFD)
}
if sys.PidFD != nil {
clone3.pidFD = uint64(uintptr(unsafe.Pointer(&pidfd)))
}
}
// About to call fork.
// No more allocation or calls of non-assembly functions.
runtime_BeforeFork()
locked = true
if clone3 != nil {
pid, err1 = rawVforkSyscall(_SYS_clone3, uintptr(unsafe.Pointer(clone3)), unsafe.Sizeof(*clone3), 0)
} else {
flags |= uintptr(SIGCHLD)
if runtime.GOARCH == "s390x" {
// On Linux/s390, the first two arguments of clone(2) are swapped.
pid, err1 = rawVforkSyscall(SYS_CLONE, 0, flags, uintptr(unsafe.Pointer(&pidfd)))
} else {
pid, err1 = rawVforkSyscall(SYS_CLONE, flags, 0, uintptr(unsafe.Pointer(&pidfd)))
}
}
if err1 != 0 || pid != 0 {
// If we're in the parent, we must return immediately
// so we're not in the same stack frame as the child.
// This can at most use the return PC, which the child
// will not modify, and the results of
// rawVforkSyscall, which must have been written after
// the child was replaced.
return
}
// Fork succeeded, now in child.
// Enable the "keep capabilities" flag to set ambient capabilities later.
if len(sys.AmbientCaps) > 0 {
_, _, err1 = RawSyscall6(SYS_PRCTL, PR_SET_KEEPCAPS, 1, 0, 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
// Wait for User ID/Group ID mappings to be written.
if sys.UidMappings != nil || sys.GidMappings != nil {
if _, _, err1 = RawSyscall(SYS_CLOSE, uintptr(mapPipe[1]), 0, 0); err1 != 0 {
goto childerror
}
pid, _, err1 = RawSyscall(SYS_READ, uintptr(mapPipe[0]), uintptr(unsafe.Pointer(&err2)), unsafe.Sizeof(err2))
if err1 != 0 {
goto childerror
}
if pid != unsafe.Sizeof(err2) {
err1 = EINVAL
goto childerror
}
if err2 != 0 {
err1 = err2
goto childerror
}
}
// Session ID
if sys.Setsid {
_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
// Set process group
if sys.Setpgid || sys.Foreground {
// Place child in process group.
_, _, err1 = RawSyscall(SYS_SETPGID, 0, uintptr(sys.Pgid), 0)
if err1 != 0 {
goto childerror
}
}
if sys.Foreground {
pgrp = int32(sys.Pgid)
if pgrp == 0 {
pid, _ = rawSyscallNoError(SYS_GETPID, 0, 0, 0)
pgrp = int32(pid)
}
// Place process group in foreground.
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
if err1 != 0 {
goto childerror
}
}
// Restore the signal mask. We do this after TIOCSPGRP to avoid
// having the kernel send a SIGTTOU signal to the process group.
runtime_AfterForkInChild()
// Unshare
if sys.Unshareflags != 0 {
_, _, err1 = RawSyscall(SYS_UNSHARE, sys.Unshareflags, 0, 0)
if err1 != 0 {
goto childerror
}
if sys.Unshareflags&CLONE_NEWUSER != 0 && sys.GidMappings != nil {
dirfd = int(_AT_FDCWD)
if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&psetgroups[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
goto childerror
}
pid, _, err1 = RawSyscall(SYS_WRITE, fd1, uintptr(unsafe.Pointer(&setgroups[0])), uintptr(len(setgroups)))
if err1 != 0 {
goto childerror
}
if _, _, err1 = RawSyscall(SYS_CLOSE, fd1, 0, 0); err1 != 0 {
goto childerror
}
if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&pgid[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
goto childerror
}
pid, _, err1 = RawSyscall(SYS_WRITE, fd1, uintptr(unsafe.Pointer(&gidmap[0])), uintptr(len(gidmap)))
if err1 != 0 {
goto childerror
}
if _, _, err1 = RawSyscall(SYS_CLOSE, fd1, 0, 0); err1 != 0 {
goto childerror
}
}
if sys.Unshareflags&CLONE_NEWUSER != 0 && sys.UidMappings != nil {
dirfd = int(_AT_FDCWD)
if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&puid[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
goto childerror
}
pid, _, err1 = RawSyscall(SYS_WRITE, fd1, uintptr(unsafe.Pointer(&uidmap[0])), uintptr(len(uidmap)))
if err1 != 0 {
goto childerror
}
if _, _, err1 = RawSyscall(SYS_CLOSE, fd1, 0, 0); err1 != 0 {
goto childerror
}
}
// The unshare system call in Linux doesn't unshare mount points
// mounted with --shared. Systemd mounts / with --shared. For a
// long discussion of the pros and cons of this see debian bug 739593.
// The Go model of unsharing is more like Plan 9, where you ask
// to unshare and the namespaces are unconditionally unshared.
// To make this model work we must further mark / as MS_PRIVATE.
// This is what the standard unshare command does.
if sys.Unshareflags&CLONE_NEWNS == CLONE_NEWNS {
_, _, err1 = RawSyscall6(SYS_MOUNT, uintptr(unsafe.Pointer(&none[0])), uintptr(unsafe.Pointer(&slash[0])), 0, MS_REC|MS_PRIVATE, 0, 0)
if err1 != 0 {
goto childerror
}
}
}
// Chroot
if chroot != nil {
_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// User and groups
if cred = sys.Credential; cred != nil {
ngroups = uintptr(len(cred.Groups))
groups = uintptr(0)
if ngroups > 0 {
groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
}
if !(sys.GidMappings != nil && !sys.GidMappingsEnableSetgroups && ngroups == 0) && !cred.NoSetGroups {
_, _, err1 = RawSyscall(_SYS_setgroups, ngroups, groups, 0)
if err1 != 0 {
goto childerror
}
}
_, _, err1 = RawSyscall(sys_SETGID, uintptr(cred.Gid), 0, 0)
if err1 != 0 {
goto childerror
}
_, _, err1 = RawSyscall(sys_SETUID, uintptr(cred.Uid), 0, 0)
if err1 != 0 {
goto childerror
}
}
if len(sys.AmbientCaps) != 0 {
// Ambient capabilities were added in the 4.3 kernel,
// so it is safe to always use _LINUX_CAPABILITY_VERSION_3.
caps.hdr.version = _LINUX_CAPABILITY_VERSION_3
if _, _, err1 = RawSyscall(SYS_CAPGET, uintptr(unsafe.Pointer(&caps.hdr)), uintptr(unsafe.Pointer(&caps.data[0])), 0); err1 != 0 {
goto childerror
}
for _, c = range sys.AmbientCaps {
// Add the c capability to the permitted and inheritable capability mask,
// otherwise we will not be able to add it to the ambient capability mask.
caps.data[capToIndex(c)].permitted |= capToMask(c)
caps.data[capToIndex(c)].inheritable |= capToMask(c)
}
if _, _, err1 = RawSyscall(SYS_CAPSET, uintptr(unsafe.Pointer(&caps.hdr)), uintptr(unsafe.Pointer(&caps.data[0])), 0); err1 != 0 {
goto childerror
}
for _, c = range sys.AmbientCaps {
_, _, err1 = RawSyscall6(SYS_PRCTL, PR_CAP_AMBIENT, uintptr(PR_CAP_AMBIENT_RAISE), c, 0, 0, 0)
if err1 != 0 {
goto childerror
}
}
}
// Chdir
if dir != nil {
_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Parent death signal
if sys.Pdeathsig != 0 {
_, _, err1 = RawSyscall6(SYS_PRCTL, PR_SET_PDEATHSIG, uintptr(sys.Pdeathsig), 0, 0, 0, 0)
if err1 != 0 {
goto childerror
}
// Signal self if parent is already dead. This might cause a
// duplicate signal in rare cases, but it won't matter when
// using SIGKILL.
pid, _ = rawSyscallNoError(SYS_GETPPID, 0, 0, 0)
if pid != ppid {
pid, _ = rawSyscallNoError(SYS_GETPID, 0, 0, 0)
_, _, err1 = RawSyscall(SYS_KILL, pid, uintptr(sys.Pdeathsig), 0)
if err1 != 0 {
goto childerror
}
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
_, _, err1 = RawSyscall(SYS_DUP3, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
if err1 != 0 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
_, _, err1 = RawSyscall(SYS_DUP3, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
if err1 != 0 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
continue
}
if fd[i] == i {
// dup2(i, i) won't clear close-on-exec flag on Linux,
// probably not elsewhere either.
_, _, err1 = RawSyscall(fcntl64Syscall, uintptr(fd[i]), F_SETFD, 0)
if err1 != 0 {
goto childerror
}
continue
}
// The new fd is created NOT close-on-exec,
// which is exactly what we want.
_, _, err1 = RawSyscall(SYS_DUP3, uintptr(fd[i]), uintptr(i), 0)
if err1 != 0 {
goto childerror
}
}
// By convention, we don't close-on-exec the fds we are
// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
// Programs that know they inherit fds >= 3 will need
// to set them close-on-exec.
for i = len(fd); i < 3; i++ {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
}
// Detach fd 0 from tty
if sys.Noctty {
_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
if err1 != 0 {
goto childerror
}
}
// Set the controlling TTY to Ctty
if sys.Setctty {
_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 1)
if err1 != 0 {
goto childerror
}
}
// Restore original rlimit.
if rlim != nil {
rawSetrlimit(RLIMIT_NOFILE, rlim)
}
// Enable tracing if requested.
// Do this right before exec so that we don't unnecessarily trace the runtime
// setting up after the fork. See issue #21428.
if sys.Ptrace {
_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
if err1 != 0 {
goto childerror
}
}
// Time to exec.
_, _, err1 = RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])),
uintptr(unsafe.Pointer(&envv[0])))
childerror:
// send error code on pipe
RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
for {
RawSyscall(SYS_EXIT, 253, 0, 0)
}
}
func formatIDMappings(idMap []SysProcIDMap) []byte {
var data []byte
for _, im := range idMap {
data = append(data, itoa.Itoa(im.ContainerID)+" "+itoa.Itoa(im.HostID)+" "+itoa.Itoa(im.Size)+"\n"...)
}
return data
}
// writeIDMappings writes the user namespace User ID or Group ID mappings to the specified path.
func writeIDMappings(path string, idMap []SysProcIDMap) error {
fd, err := Open(path, O_RDWR, 0)
if err != nil {
return err
}
if _, err := Write(fd, formatIDMappings(idMap)); err != nil {
Close(fd)
return err
}
if err := Close(fd); err != nil {
return err
}
return nil
}
// writeSetgroups writes to /proc/PID/setgroups "deny" if enable is false
// and "allow" if enable is true.
// This is needed since kernel 3.19, because you can't write gid_map without
// disabling setgroups() system call.
func writeSetgroups(pid int, enable bool) error {
sgf := "/proc/" + itoa.Itoa(pid) + "/setgroups"
fd, err := Open(sgf, O_RDWR, 0)
if err != nil {
return err
}
var data []byte
if enable {
data = []byte("allow")
} else {
data = []byte("deny")
}
if _, err := Write(fd, data); err != nil {
Close(fd)
return err
}
return Close(fd)
}
// writeUidGidMappings writes User ID and Group ID mappings for user namespaces
// for a process and it is called from the parent process.
func writeUidGidMappings(pid int, sys *SysProcAttr) error {
if sys.UidMappings != nil {
uidf := "/proc/" + itoa.Itoa(pid) + "/uid_map"
if err := writeIDMappings(uidf, sys.UidMappings); err != nil {
return err
}
}
if sys.GidMappings != nil {
// If the kernel is too old to support /proc/PID/setgroups, writeSetGroups will return ENOENT; this is OK.
if err := writeSetgroups(pid, sys.GidMappingsEnableSetgroups); err != nil && err != ENOENT {
return err
}
gidf := "/proc/" + itoa.Itoa(pid) + "/gid_map"
if err := writeIDMappings(gidf, sys.GidMappings); err != nil {
return err
}
}
return nil
}
// forkAndExecFailureCleanup cleans up after an exec failure.
func forkAndExecFailureCleanup(attr *ProcAttr, sys *SysProcAttr) {
if sys.PidFD != nil && *sys.PidFD != -1 {
Close(*sys.PidFD)
*sys.PidFD = -1
}
}

758
src/syscall/exec_linux_test.go Normal file
View File

@@ -0,0 +1,758 @@
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
package syscall_test
import (
"bytes"
"errors"
"flag"
"fmt"
"internal/platform"
"internal/syscall/unix"
"internal/testenv"
"io"
"os"
"os/exec"
"os/user"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"syscall"
"testing"
"time"
"unsafe"
)
// whoamiNEWUSER returns a command that runs "whoami" with CLONE_NEWUSER,
// mapping uid and gid 0 to the actual uid and gid of the test.
func whoamiNEWUSER(t *testing.T, uid, gid int, setgroups bool) *exec.Cmd {
t.Helper()
testenv.MustHaveExecPath(t, "whoami")
cmd := testenv.Command(t, "whoami")
cmd.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: syscall.CLONE_NEWUSER,
UidMappings: []syscall.SysProcIDMap{
{ContainerID: 0, HostID: uid, Size: 1},
},
GidMappings: []syscall.SysProcIDMap{
{ContainerID: 0, HostID: gid, Size: 1},
},
GidMappingsEnableSetgroups: setgroups,
}
return cmd
}
func TestCloneNEWUSERAndRemap(t *testing.T) {
for _, setgroups := range []bool{false, true} {
setgroups := setgroups
t.Run(fmt.Sprintf("setgroups=%v", setgroups), func(t *testing.T) {
uid := os.Getuid()
gid := os.Getgid()
cmd := whoamiNEWUSER(t, uid, gid, setgroups)
out, err := cmd.CombinedOutput()
t.Logf("%v: %v", cmd, err)
if uid != 0 && setgroups {
t.Logf("as non-root, expected permission error due to unprivileged gid_map")
if !os.IsPermission(err) {
if err == nil {
t.Skipf("unexpected success: probably old kernel without security fix?")
}
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: CLONE_NEWUSER appears to be unsupported")
}
t.Fatalf("got non-permission error") // Already logged above.
}
return
}
if err != nil {
if testenv.SyscallIsNotSupported(err) {
// May be inside a container that disallows CLONE_NEWUSER.
t.Skipf("skipping: CLONE_NEWUSER appears to be unsupported")
}
t.Fatalf("unexpected command failure; output:\n%s", out)
}
sout := strings.TrimSpace(string(out))
want := "root"
if sout != want {
t.Fatalf("whoami = %q; want %q", out, want)
}
})
}
}
func TestEmptyCredGroupsDisableSetgroups(t *testing.T) {
cmd := whoamiNEWUSER(t, os.Getuid(), os.Getgid(), false)
cmd.SysProcAttr.Credential = &syscall.Credential{}
if err := cmd.Run(); err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: %v: %v", cmd, err)
}
t.Fatal(err)
}
}
func TestUnshare(t *testing.T) {
path := "/proc/net/dev"
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
t.Skip("kernel doesn't support proc filesystem")
}
if os.IsPermission(err) {
t.Skip("unable to test proc filesystem due to permissions")
}
t.Fatal(err)
}
b, err := os.ReadFile(path)
if err != nil {
t.Fatal(err)
}
orig := strings.TrimSpace(string(b))
if strings.Contains(orig, "lo:") && strings.Count(orig, ":") == 1 {
// This test expects there to be at least 1 more network interface
// in addition to the local network interface, so that it can tell
// that unshare worked.
t.Skip("not enough network interfaces to test unshare with")
}
cmd := testenv.Command(t, "cat", path)
cmd.SysProcAttr = &syscall.SysProcAttr{
Unshareflags: syscall.CLONE_NEWNET,
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
// CLONE_NEWNET does not appear to be supported.
t.Skipf("skipping due to permission error: %v", err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
// Check there is only the local network interface.
sout := strings.TrimSpace(string(out))
if !strings.Contains(sout, "lo:") {
t.Fatalf("Expected lo network interface to exist, got %s", sout)
}
origLines := strings.Split(orig, "\n")
lines := strings.Split(sout, "\n")
if len(lines) >= len(origLines) {
t.Logf("%s before unshare:\n%s", path, orig)
t.Logf("%s after unshare:\n%s", path, sout)
t.Fatalf("Got %d lines of output, want < %d", len(lines), len(origLines))
}
}
func TestGroupCleanup(t *testing.T) {
testenv.MustHaveExecPath(t, "id")
cmd := testenv.Command(t, "id")
cmd.SysProcAttr = &syscall.SysProcAttr{
Credential: &syscall.Credential{
Uid: 0,
Gid: 0,
},
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: %v: %v", cmd, err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
strOut := strings.TrimSpace(string(out))
t.Logf("id: %s", strOut)
expected := "uid=0(root) gid=0(root)"
// Just check prefix because some distros reportedly output a
// context parameter; see https://golang.org/issue/16224.
// Alpine does not output groups; see https://golang.org/issue/19938.
if !strings.HasPrefix(strOut, expected) {
t.Errorf("expected prefix: %q", expected)
}
}
func TestGroupCleanupUserNamespace(t *testing.T) {
testenv.MustHaveExecPath(t, "id")
cmd := testenv.Command(t, "id")
uid, gid := os.Getuid(), os.Getgid()
cmd.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: syscall.CLONE_NEWUSER,
Credential: &syscall.Credential{
Uid: uint32(uid),
Gid: uint32(gid),
},
UidMappings: []syscall.SysProcIDMap{
{ContainerID: 0, HostID: uid, Size: 1},
},
GidMappings: []syscall.SysProcIDMap{
{ContainerID: 0, HostID: gid, Size: 1},
},
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: %v: %v", cmd, err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
strOut := strings.TrimSpace(string(out))
t.Logf("id: %s", strOut)
// As in TestGroupCleanup, just check prefix.
// The actual groups and contexts seem to vary from one distro to the next.
expected := "uid=0(root) gid=0(root) groups=0(root)"
if !strings.HasPrefix(strOut, expected) {
t.Errorf("expected prefix: %q", expected)
}
}
// Test for https://go.dev/issue/19661: unshare fails because systemd
// has forced / to be shared
func TestUnshareMountNameSpace(t *testing.T) {
const mountNotSupported = "mount is not supported: " // Output prefix indicating a test skip.
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
dir := flag.Args()[0]
err := syscall.Mount("none", dir, "proc", 0, "")
if testenv.SyscallIsNotSupported(err) {
fmt.Print(mountNotSupported, err)
} else if err != nil {
fmt.Fprintf(os.Stderr, "unshare: mount %s: %v\n", dir, err)
os.Exit(2)
}
os.Exit(0)
}
testenv.MustHaveExec(t)
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
d := t.TempDir()
t.Cleanup(func() {
// If the subprocess fails to unshare the parent directory, force-unmount it
// so that the test can clean it up.
if _, err := os.Stat(d); err == nil {
syscall.Unmount(d, syscall.MNT_FORCE)
}
})
cmd := testenv.Command(t, exe, "-test.run=^TestUnshareMountNameSpace$", d)
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{Unshareflags: syscall.CLONE_NEWNS}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: could not start process with CLONE_NEWNS: %v", err)
}
t.Fatalf("unshare failed: %v\n%s", err, out)
} else if len(out) != 0 {
if bytes.HasPrefix(out, []byte(mountNotSupported)) {
t.Skipf("skipping: helper process reported %s", out)
}
t.Fatalf("unexpected output from helper process: %s", out)
}
// How do we tell if the namespace was really unshared? It turns out
// to be simple: just try to remove the directory. If it's still mounted
// on the rm will fail with EBUSY.
if err := os.Remove(d); err != nil {
t.Errorf("rmdir failed on %v: %v", d, err)
}
}
// Test for Issue 20103: unshare fails when chroot is used
func TestUnshareMountNameSpaceChroot(t *testing.T) {
const mountNotSupported = "mount is not supported: " // Output prefix indicating a test skip.
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
dir := flag.Args()[0]
err := syscall.Mount("none", dir, "proc", 0, "")
if testenv.SyscallIsNotSupported(err) {
fmt.Print(mountNotSupported, err)
} else if err != nil {
fmt.Fprintf(os.Stderr, "unshare: mount %s: %v\n", dir, err)
os.Exit(2)
}
os.Exit(0)
}
d := t.TempDir()
// Since we are doing a chroot, we need the binary there,
// and it must be statically linked.
testenv.MustHaveGoBuild(t)
if platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
t.Skipf("skipping: can't build static binary because %s/%s requires external linking", runtime.GOOS, runtime.GOARCH)
}
x := filepath.Join(d, "syscall.test")
t.Cleanup(func() {
// If the subprocess fails to unshare the parent directory, force-unmount it
// so that the test can clean it up.
if _, err := os.Stat(d); err == nil {
syscall.Unmount(d, syscall.MNT_FORCE)
}
})
cmd := testenv.Command(t, testenv.GoToolPath(t), "test", "-c", "-o", x, "syscall")
cmd.Env = append(cmd.Environ(), "CGO_ENABLED=0")
if o, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("%v: %v\n%s", cmd, err, o)
}
cmd = testenv.Command(t, "/syscall.test", "-test.run=^TestUnshareMountNameSpaceChroot$", "/")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{Chroot: d, Unshareflags: syscall.CLONE_NEWNS}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: could not start process with CLONE_NEWNS and Chroot %q: %v", d, err)
}
t.Fatalf("unshare failed: %v\n%s", err, out)
} else if len(out) != 0 {
if bytes.HasPrefix(out, []byte(mountNotSupported)) {
t.Skipf("skipping: helper process reported %s", out)
}
t.Fatalf("unexpected output from helper process: %s", out)
}
// How do we tell if the namespace was really unshared? It turns out
// to be simple: just try to remove the executable. If it's still mounted
// on, the rm will fail.
if err := os.Remove(x); err != nil {
t.Errorf("rm failed on %v: %v", x, err)
}
if err := os.Remove(d); err != nil {
t.Errorf("rmdir failed on %v: %v", d, err)
}
}
// Test for Issue 29789: unshare fails when uid/gid mapping is specified
func TestUnshareUidGidMapping(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
defer os.Exit(0)
if err := syscall.Chroot(os.TempDir()); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
}
if os.Getuid() == 0 {
t.Skip("test exercises unprivileged user namespace, fails with privileges")
}
testenv.MustHaveExec(t)
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
cmd := testenv.Command(t, exe, "-test.run=^TestUnshareUidGidMapping$")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{
Unshareflags: syscall.CLONE_NEWNS | syscall.CLONE_NEWUSER,
GidMappingsEnableSetgroups: false,
UidMappings: []syscall.SysProcIDMap{
{
ContainerID: 0,
HostID: syscall.Getuid(),
Size: 1,
},
},
GidMappings: []syscall.SysProcIDMap{
{
ContainerID: 0,
HostID: syscall.Getgid(),
Size: 1,
},
},
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: could not start process with CLONE_NEWNS and CLONE_NEWUSER: %v", err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
}
func prepareCgroupFD(t *testing.T) (int, string) {
t.Helper()
const O_PATH = 0x200000 // Same for all architectures, but for some reason not defined in syscall for 386||amd64.
// Requires cgroup v2.
const prefix = "/sys/fs/cgroup"
selfCg, err := os.ReadFile("/proc/self/cgroup")
if err != nil {
if os.IsNotExist(err) || os.IsPermission(err) {
t.Skip(err)
}
t.Fatal(err)
}
// Expect a single line like this:
// 0::/user.slice/user-1000.slice/user@1000.service/app.slice/vte-spawn-891992a2-efbb-4f28-aedb-b24f9e706770.scope
// Otherwise it's either cgroup v1 or a hybrid hierarchy.
if bytes.Count(selfCg, []byte("\n")) > 1 {
t.Skip("cgroup v2 not available")
}
cg := bytes.TrimPrefix(selfCg, []byte("0::"))
if len(cg) == len(selfCg) { // No prefix found.
t.Skipf("cgroup v2 not available (/proc/self/cgroup contents: %q)", selfCg)
}
// Need an ability to create a sub-cgroup.
subCgroup, err := os.MkdirTemp(prefix+string(bytes.TrimSpace(cg)), "subcg-")
if err != nil {
// ErrPermission or EROFS (#57262) when running in an unprivileged container.
// ErrNotExist when cgroupfs is not mounted in chroot/schroot.
if os.IsNotExist(err) || testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: %v", err)
}
t.Fatal(err)
}
t.Cleanup(func() { syscall.Rmdir(subCgroup) })
cgroupFD, err := syscall.Open(subCgroup, O_PATH, 0)
if err != nil {
t.Fatal(&os.PathError{Op: "open", Path: subCgroup, Err: err})
}
t.Cleanup(func() { syscall.Close(cgroupFD) })
return cgroupFD, "/" + path.Base(subCgroup)
}
func TestUseCgroupFD(t *testing.T) {
testenv.MustHaveExec(t)
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
// Read and print own cgroup path.
selfCg, err := os.ReadFile("/proc/self/cgroup")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
fmt.Print(string(selfCg))
os.Exit(0)
}
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
fd, suffix := prepareCgroupFD(t)
cmd := testenv.Command(t, exe, "-test.run=^TestUseCgroupFD$")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{
UseCgroupFD: true,
CgroupFD: fd,
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) && !errors.Is(err, syscall.EINVAL) {
// Can be one of:
// - clone3 not supported (old kernel);
// - clone3 not allowed (by e.g. seccomp);
// - lack of CAP_SYS_ADMIN.
t.Skipf("clone3 with CLONE_INTO_CGROUP not available: %v", err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
// NB: this wouldn't work with cgroupns.
if !bytes.HasSuffix(bytes.TrimSpace(out), []byte(suffix)) {
t.Fatalf("got: %q, want: a line that ends with %q", out, suffix)
}
}
func TestCloneTimeNamespace(t *testing.T) {
testenv.MustHaveExec(t)
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
timens, err := os.Readlink("/proc/self/ns/time")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
fmt.Print(string(timens))
os.Exit(0)
}
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
cmd := testenv.Command(t, exe, "-test.run=^TestCloneTimeNamespace$")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: syscall.CLONE_NEWTIME,
}
out, err := cmd.CombinedOutput()
if err != nil {
if testenv.SyscallIsNotSupported(err) {
// CLONE_NEWTIME does not appear to be supported.
t.Skipf("skipping, CLONE_NEWTIME not supported: %v", err)
}
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
// Inode number of the time namespaces should be different.
// Based on https://man7.org/linux/man-pages/man7/time_namespaces.7.html#EXAMPLES
timens, err := os.Readlink("/proc/self/ns/time")
if err != nil {
t.Fatal(err)
}
parentTimeNS := timens
childTimeNS := string(out)
if childTimeNS == parentTimeNS {
t.Fatalf("expected child time namespace to be different from parent time namespace: %s", parentTimeNS)
}
}
func testPidFD(t *testing.T, userns bool) error {
testenv.MustHaveExec(t)
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
// Child: wait for a signal.
time.Sleep(time.Hour)
}
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
var pidfd int
cmd := testenv.Command(t, exe, "-test.run=^TestPidFD$")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{
PidFD: &pidfd,
}
if userns {
cmd.SysProcAttr.Cloneflags = syscall.CLONE_NEWUSER
}
if err := cmd.Start(); err != nil {
return err
}
defer func() {
cmd.Process.Kill()
cmd.Wait()
}()
t.Log("got pidfd:", pidfd)
// If pidfd is not supported by the kernel, -1 is returned.
if pidfd == -1 {
t.Skip("pidfd not supported")
}
defer syscall.Close(pidfd)
// Use pidfd to send a signal to the child.
sig := syscall.SIGINT
if err := unix.PidFDSendSignal(uintptr(pidfd), sig); err != nil {
if err != syscall.EINVAL && testenv.SyscallIsNotSupported(err) {
t.Skip("pidfd_send_signal syscall not supported:", err)
}
t.Fatal("pidfd_send_signal syscall failed:", err)
}
// Check if the child received our signal.
err = cmd.Wait()
if cmd.ProcessState == nil || cmd.ProcessState.Sys().(syscall.WaitStatus).Signal() != sig {
t.Fatal("unexpected child error:", err)
}
return nil
}
func TestPidFD(t *testing.T) {
if err := testPidFD(t, false); err != nil {
t.Fatal("can't start a process:", err)
}
}
func TestPidFDWithUserNS(t *testing.T) {
if err := testPidFD(t, true); err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skip("userns not supported:", err)
}
t.Fatal("can't start a process:", err)
}
}
func TestPidFDClone3(t *testing.T) {
*syscall.ForceClone3 = true
defer func() { *syscall.ForceClone3 = false }()
if err := testPidFD(t, false); err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skip("clone3 not supported:", err)
}
t.Fatal("can't start a process:", err)
}
}
type capHeader struct {
version uint32
pid int32
}
type capData struct {
effective uint32
permitted uint32
inheritable uint32
}
const CAP_SYS_TIME = 25
const CAP_SYSLOG = 34
type caps struct {
hdr capHeader
data [2]capData
}
func getCaps() (caps, error) {
var c caps
// Get capability version
if _, _, errno := syscall.Syscall(syscall.SYS_CAPGET, uintptr(unsafe.Pointer(&c.hdr)), uintptr(unsafe.Pointer(nil)), 0); errno != 0 {
return c, fmt.Errorf("SYS_CAPGET: %v", errno)
}
// Get current capabilities
if _, _, errno := syscall.Syscall(syscall.SYS_CAPGET, uintptr(unsafe.Pointer(&c.hdr)), uintptr(unsafe.Pointer(&c.data[0])), 0); errno != 0 {
return c, fmt.Errorf("SYS_CAPGET: %v", errno)
}
return c, nil
}
func TestAmbientCaps(t *testing.T) {
testAmbientCaps(t, false)
}
func TestAmbientCapsUserns(t *testing.T) {
b, err := os.ReadFile("/proc/sys/kernel/apparmor_restrict_unprivileged_userns")
if err == nil && strings.TrimSpace(string(b)) == "1" {
t.Skip("AppArmor restriction for unprivileged user namespaces is enabled")
}
testAmbientCaps(t, true)
}
func testAmbientCaps(t *testing.T, userns bool) {
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
caps, err := getCaps()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if caps.data[0].effective&(1<<uint(CAP_SYS_TIME)) == 0 {
fmt.Fprintln(os.Stderr, "CAP_SYS_TIME unexpectedly not in the effective capability mask")
os.Exit(2)
}
if caps.data[1].effective&(1<<uint(CAP_SYSLOG&31)) == 0 {
fmt.Fprintln(os.Stderr, "CAP_SYSLOG unexpectedly not in the effective capability mask")
os.Exit(2)
}
os.Exit(0)
}
// skip on android, due to lack of lookup support
if runtime.GOOS == "android" {
t.Skip("skipping test on android; see Issue 27327")
}
u, err := user.Lookup("nobody")
if err != nil {
t.Fatal(err)
}
uid, err := strconv.ParseInt(u.Uid, 0, 32)
if err != nil {
t.Fatal(err)
}
gid, err := strconv.ParseInt(u.Gid, 0, 32)
if err != nil {
t.Fatal(err)
}
// Copy the test binary to a temporary location which is readable by nobody.
f, err := os.CreateTemp("", "gotest")
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() {
f.Close()
os.Remove(f.Name())
})
testenv.MustHaveExec(t)
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
e, err := os.Open(exe)
if err != nil {
t.Fatal(err)
}
defer e.Close()
if _, err := io.Copy(f, e); err != nil {
t.Fatal(err)
}
if err := f.Chmod(0755); err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
cmd := testenv.Command(t, f.Name(), "-test.run=^"+t.Name()+"$")
cmd.Env = append(cmd.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.SysProcAttr = &syscall.SysProcAttr{
Credential: &syscall.Credential{
Uid: uint32(uid),
Gid: uint32(gid),
},
AmbientCaps: []uintptr{CAP_SYS_TIME, CAP_SYSLOG},
}
if userns {
cmd.SysProcAttr.Cloneflags = syscall.CLONE_NEWUSER
const nobody = 65534
uid := os.Getuid()
gid := os.Getgid()
cmd.SysProcAttr.UidMappings = []syscall.SysProcIDMap{{
ContainerID: int(nobody),
HostID: uid,
Size: int(1),
}}
cmd.SysProcAttr.GidMappings = []syscall.SysProcIDMap{{
ContainerID: int(nobody),
HostID: gid,
Size: int(1),
}}
// Set credentials to run as user and group nobody.
cmd.SysProcAttr.Credential = &syscall.Credential{
Uid: nobody,
Gid: nobody,
}
}
if err := cmd.Run(); err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: %v: %v", cmd, err)
}
t.Fatal(err.Error())
}
}

187
src/syscall/exec_pdeathsig_test.go Normal file
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@@ -0,0 +1,187 @@
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build freebsd || linux
package syscall_test
import (
"bufio"
"fmt"
"internal/testenv"
"io"
"os"
"os/exec"
"os/signal"
"os/user"
"path/filepath"
"strconv"
"strings"
"syscall"
"testing"
)
// TestDeathSignalSetuid verifies that a command run with a different UID still
// receives PDeathsig; it is a regression test for https://go.dev/issue/9686.
func TestDeathSignalSetuid(t *testing.T) {
if testing.Short() {
t.Skipf("skipping test that copies its binary into temp dir")
}
// Copy the test binary to a location that another user can read/execute
// after we drop privileges.
//
// TODO(bcmills): Why do we believe that another users will be able to
// execute a binary in this directory? (It could be mounted noexec.)
tempDir, err := os.MkdirTemp("", "TestDeathSignal")
if err != nil {
t.Fatalf("cannot create temporary directory: %v", err)
}
defer os.RemoveAll(tempDir)
os.Chmod(tempDir, 0755)
tmpBinary := filepath.Join(tempDir, filepath.Base(os.Args[0]))
src, err := os.Open(os.Args[0])
if err != nil {
t.Fatalf("cannot open binary %q, %v", os.Args[0], err)
}
defer src.Close()
dst, err := os.OpenFile(tmpBinary, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
t.Fatalf("cannot create temporary binary %q, %v", tmpBinary, err)
}
if _, err := io.Copy(dst, src); err != nil {
t.Fatalf("failed to copy test binary to %q, %v", tmpBinary, err)
}
err = dst.Close()
if err != nil {
t.Fatalf("failed to close test binary %q, %v", tmpBinary, err)
}
cmd := testenv.Command(t, tmpBinary)
cmd.Env = append(cmd.Environ(), "GO_DEATHSIG_PARENT=1")
chldStdin, err := cmd.StdinPipe()
if err != nil {
t.Fatalf("failed to create new stdin pipe: %v", err)
}
chldStdout, err := cmd.StdoutPipe()
if err != nil {
t.Fatalf("failed to create new stdout pipe: %v", err)
}
stderr := new(strings.Builder)
cmd.Stderr = stderr
err = cmd.Start()
defer func() {
chldStdin.Close()
cmd.Wait()
if stderr.Len() > 0 {
t.Logf("stderr:\n%s", stderr)
}
}()
if err != nil {
t.Fatalf("failed to start first child process: %v", err)
}
chldPipe := bufio.NewReader(chldStdout)
if got, err := chldPipe.ReadString('\n'); got == "start\n" {
syscall.Kill(cmd.Process.Pid, syscall.SIGTERM)
want := "ok\n"
if got, err = chldPipe.ReadString('\n'); got != want {
t.Fatalf("expected %q, received %q, %v", want, got, err)
}
} else if got == "skip\n" {
t.Skipf("skipping: parent could not run child program as selected user")
} else {
t.Fatalf("did not receive start from child, received %q, %v", got, err)
}
}
func deathSignalParent() {
var (
u *user.User
err error
)
if os.Getuid() == 0 {
tryUsers := []string{"nobody"}
if testenv.Builder() != "" {
tryUsers = append(tryUsers, "gopher")
}
for _, name := range tryUsers {
u, err = user.Lookup(name)
if err == nil {
break
}
fmt.Fprintf(os.Stderr, "Lookup(%q): %v\n", name, err)
}
}
if u == nil {
// If we couldn't find an unprivileged user to run as, try running as
// the current user. (Empirically this still causes the call to Start to
// fail with a permission error if running as a non-root user on Linux.)
u, err = user.Current()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
uid, err := strconv.ParseUint(u.Uid, 10, 32)
if err != nil {
fmt.Fprintf(os.Stderr, "invalid UID: %v\n", err)
os.Exit(1)
}
gid, err := strconv.ParseUint(u.Gid, 10, 32)
if err != nil {
fmt.Fprintf(os.Stderr, "invalid GID: %v\n", err)
os.Exit(1)
}
cmd := exec.Command(os.Args[0])
cmd.Env = append(os.Environ(),
"GO_DEATHSIG_PARENT=",
"GO_DEATHSIG_CHILD=1",
)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
attrs := syscall.SysProcAttr{
Pdeathsig: syscall.SIGUSR1,
Credential: &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)},
}
cmd.SysProcAttr = &attrs
fmt.Fprintf(os.Stderr, "starting process as user %q\n", u.Username)
if err := cmd.Start(); err != nil {
fmt.Fprintln(os.Stderr, err)
if testenv.SyscallIsNotSupported(err) {
fmt.Println("skip")
os.Exit(0)
}
os.Exit(1)
}
cmd.Wait()
os.Exit(0)
}
func deathSignalChild() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR1)
go func() {
<-c
fmt.Println("ok")
os.Exit(0)
}()
fmt.Println("start")
buf := make([]byte, 32)
os.Stdin.Read(buf)
// We expected to be signaled before stdin closed
fmt.Println("not ok")
os.Exit(1)
}

611
src/syscall/exec_plan9.go Normal file
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@@ -0,0 +1,611 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fork, exec, wait, etc.
package syscall
import (
"internal/itoa"
"runtime"
"sync"
"unsafe"
)
// ForkLock is not used on plan9.
var ForkLock sync.RWMutex
// gstringb reads a non-empty string from b, prefixed with a 16-bit length in little-endian order.
// It returns the string as a byte slice, or nil if b is too short to contain the length or
// the full string.
//
//go:nosplit
func gstringb(b []byte) []byte {
if len(b) < 2 {
return nil
}
n, b := gbit16(b)
if int(n) > len(b) {
return nil
}
return b[:n]
}
// Offset of the name field in a 9P directory entry - see UnmarshalDir() in dir_plan9.go
const nameOffset = 39
// gdirname returns the first filename from a buffer of directory entries,
// and a slice containing the remaining directory entries.
// If the buffer doesn't start with a valid directory entry, the returned name is nil.
//
//go:nosplit
func gdirname(buf []byte) (name []byte, rest []byte) {
if len(buf) < 2 {
return
}
size, buf := gbit16(buf)
if size < STATFIXLEN || int(size) > len(buf) {
return
}
name = gstringb(buf[nameOffset:size])
rest = buf[size:]
return
}
// StringSlicePtr converts a slice of strings to a slice of pointers
// to NUL-terminated byte arrays. If any string contains a NUL byte
// this function panics instead of returning an error.
//
// Deprecated: Use SlicePtrFromStrings instead.
func StringSlicePtr(ss []string) []*byte {
bb := make([]*byte, len(ss)+1)
for i := 0; i < len(ss); i++ {
bb[i] = StringBytePtr(ss[i])
}
bb[len(ss)] = nil
return bb
}
// SlicePtrFromStrings converts a slice of strings to a slice of
// pointers to NUL-terminated byte arrays. If any string contains
// a NUL byte, it returns (nil, [EINVAL]).
func SlicePtrFromStrings(ss []string) ([]*byte, error) {
var err error
bb := make([]*byte, len(ss)+1)
for i := 0; i < len(ss); i++ {
bb[i], err = BytePtrFromString(ss[i])
if err != nil {
return nil, err
}
}
bb[len(ss)] = nil
return bb, nil
}
// readdirnames returns the names of files inside the directory represented by dirfd.
func readdirnames(dirfd int) (names []string, err error) {
names = make([]string, 0, 100)
var buf [STATMAX]byte
for {
n, e := Read(dirfd, buf[:])
if e != nil {
return nil, e
}
if n == 0 {
break
}
for b := buf[:n]; len(b) > 0; {
var s []byte
s, b = gdirname(b)
if s == nil {
return nil, ErrBadStat
}
names = append(names, string(s))
}
}
return
}
// name of the directory containing names and control files for all open file descriptors
var dupdev, _ = BytePtrFromString("#d")
// forkAndExecInChild forks the process, calling dup onto 0..len(fd)
// and finally invoking exec(argv0, argvv, envv) in the child.
// If a dup or exec fails, it writes the error string to pipe.
// (The pipe write end is close-on-exec so if exec succeeds, it will be closed.)
//
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// The calls to RawSyscall are okay because they are assembly
// functions that do not grow the stack.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv []*byte, envv []envItem, dir *byte, attr *ProcAttr, pipe int, rflag int) (pid int, err error) {
// Declare all variables at top in case any
// declarations require heap allocation (e.g., errbuf).
var (
r1 uintptr
nextfd int
i int
clearenv int
envfd int
errbuf [ERRMAX]byte
statbuf [STATMAX]byte
dupdevfd int
n int
b []byte
)
// Guard against side effects of shuffling fds below.
// Make sure that nextfd is beyond any currently open files so
// that we can't run the risk of overwriting any of them.
fd := make([]int, len(attr.Files))
nextfd = len(attr.Files)
for i, ufd := range attr.Files {
if nextfd < int(ufd) {
nextfd = int(ufd)
}
fd[i] = int(ufd)
}
nextfd++
if envv != nil {
clearenv = RFCENVG
}
// About to call fork.
// No more allocation or calls of non-assembly functions.
r1, _, _ = RawSyscall(SYS_RFORK, uintptr(RFPROC|RFFDG|RFREND|clearenv|rflag), 0, 0)
if r1 != 0 {
if int32(r1) == -1 {
return 0, NewError(errstr())
}
// parent; return PID
return int(r1), nil
}
// Fork succeeded, now in child.
// Close fds we don't need.
r1, _, _ = RawSyscall(SYS_OPEN, uintptr(unsafe.Pointer(dupdev)), uintptr(O_RDONLY), 0)
dupdevfd = int(r1)
if dupdevfd == -1 {
goto childerror
}
dirloop:
for {
r1, _, _ = RawSyscall6(SYS_PREAD, uintptr(dupdevfd), uintptr(unsafe.Pointer(&statbuf[0])), uintptr(len(statbuf)), ^uintptr(0), ^uintptr(0), 0)
n = int(r1)
switch n {
case -1:
goto childerror
case 0:
break dirloop
}
for b = statbuf[:n]; len(b) > 0; {
var s []byte
s, b = gdirname(b)
if s == nil {
copy(errbuf[:], ErrBadStat.Error())
goto childerror1
}
if s[len(s)-1] == 'l' {
// control file for descriptor <N> is named <N>ctl
continue
}
closeFdExcept(int(atoi(s)), pipe, dupdevfd, fd)
}
}
RawSyscall(SYS_CLOSE, uintptr(dupdevfd), 0, 0)
// Write new environment variables.
if envv != nil {
for i = 0; i < len(envv); i++ {
r1, _, _ = RawSyscall(SYS_CREATE, uintptr(unsafe.Pointer(envv[i].name)), uintptr(O_WRONLY), uintptr(0666))
if int32(r1) == -1 {
goto childerror
}
envfd = int(r1)
r1, _, _ = RawSyscall6(SYS_PWRITE, uintptr(envfd), uintptr(unsafe.Pointer(envv[i].value)), uintptr(envv[i].nvalue),
^uintptr(0), ^uintptr(0), 0)
if int32(r1) == -1 || int(r1) != envv[i].nvalue {
goto childerror
}
r1, _, _ = RawSyscall(SYS_CLOSE, uintptr(envfd), 0, 0)
if int32(r1) == -1 {
goto childerror
}
}
}
// Chdir
if dir != nil {
r1, _, _ = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
if int32(r1) == -1 {
goto childerror
}
}
// Pass 1: look for fd[i] < i and move those up above len(fd)
// so that pass 2 won't stomp on an fd it needs later.
if pipe < nextfd {
r1, _, _ = RawSyscall(SYS_DUP, uintptr(pipe), uintptr(nextfd), 0)
if int32(r1) == -1 {
goto childerror
}
pipe = nextfd
nextfd++
}
for i = 0; i < len(fd); i++ {
if fd[i] >= 0 && fd[i] < i {
if nextfd == pipe { // don't stomp on pipe
nextfd++
}
r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(nextfd), 0)
if int32(r1) == -1 {
goto childerror
}
fd[i] = nextfd
nextfd++
}
}
// Pass 2: dup fd[i] down onto i.
for i = 0; i < len(fd); i++ {
if fd[i] == -1 {
RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
continue
}
if fd[i] == i {
continue
}
r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(i), 0)
if int32(r1) == -1 {
goto childerror
}
}
// Pass 3: close fd[i] if it was moved in the previous pass.
for i = 0; i < len(fd); i++ {
if fd[i] >= len(fd) {
RawSyscall(SYS_CLOSE, uintptr(fd[i]), 0, 0)
}
}
// Time to exec.
r1, _, _ = RawSyscall(SYS_EXEC,
uintptr(unsafe.Pointer(argv0)),
uintptr(unsafe.Pointer(&argv[0])), 0)
childerror:
// send error string on pipe
RawSyscall(SYS_ERRSTR, uintptr(unsafe.Pointer(&errbuf[0])), uintptr(len(errbuf)), 0)
childerror1:
errbuf[len(errbuf)-1] = 0
i = 0
for i < len(errbuf) && errbuf[i] != 0 {
i++
}
RawSyscall6(SYS_PWRITE, uintptr(pipe), uintptr(unsafe.Pointer(&errbuf[0])), uintptr(i),
^uintptr(0), ^uintptr(0), 0)
for {
RawSyscall(SYS_EXITS, 0, 0, 0)
}
}
// close the numbered file descriptor, unless it is fd1, fd2, or a member of fds.
//
//go:nosplit
func closeFdExcept(n int, fd1 int, fd2 int, fds []int) {
if n == fd1 || n == fd2 {
return
}
for _, fd := range fds {
if n == fd {
return
}
}
RawSyscall(SYS_CLOSE, uintptr(n), 0, 0)
}
func cexecPipe(p []int) error {
e := Pipe(p)
if e != nil {
return e
}
fd, e := Open("#d/"+itoa.Itoa(p[1]), O_RDWR|O_CLOEXEC)
if e != nil {
Close(p[0])
Close(p[1])
return e
}
Close(p[1])
p[1] = fd
return nil
}
type envItem struct {
name *byte
value *byte
nvalue int
}
type ProcAttr struct {
Dir string // Current working directory.
Env []string // Environment.
Files []uintptr // File descriptors.
Sys *SysProcAttr
}
type SysProcAttr struct {
Rfork int // additional flags to pass to rfork
}
var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr
func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
var (
p [2]int
n int
errbuf [ERRMAX]byte
wmsg Waitmsg
)
if attr == nil {
attr = &zeroProcAttr
}
sys := attr.Sys
if sys == nil {
sys = &zeroSysProcAttr
}
p[0] = -1
p[1] = -1
// Convert args to C form.
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return 0, err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return 0, err
}
destDir := attr.Dir
if destDir == "" {
wdmu.Lock()
destDir = wdStr
wdmu.Unlock()
}
var dir *byte
if destDir != "" {
dir, err = BytePtrFromString(destDir)
if err != nil {
return 0, err
}
}
var envvParsed []envItem
if attr.Env != nil {
envvParsed = make([]envItem, 0, len(attr.Env))
for _, v := range attr.Env {
i := 0
for i < len(v) && v[i] != '=' {
i++
}
envname, err := BytePtrFromString("/env/" + v[:i])
if err != nil {
return 0, err
}
envvalue := make([]byte, len(v)-i)
copy(envvalue, v[i+1:])
envvParsed = append(envvParsed, envItem{envname, &envvalue[0], len(v) - i})
}
}
// Allocate child status pipe close on exec.
e := cexecPipe(p[:])
if e != nil {
return 0, e
}
// Kick off child.
pid, err = forkAndExecInChild(argv0p, argvp, envvParsed, dir, attr, p[1], sys.Rfork)
if err != nil {
if p[0] >= 0 {
Close(p[0])
Close(p[1])
}
return 0, err
}
// Read child error status from pipe.
Close(p[1])
n, err = Read(p[0], errbuf[:])
Close(p[0])
if err != nil || n != 0 {
if n > 0 {
err = NewError(string(errbuf[:n]))
} else if err == nil {
err = NewError("failed to read exec status")
}
// Child failed; wait for it to exit, to make sure
// the zombies don't accumulate.
for wmsg.Pid != pid {
Await(&wmsg)
}
return 0, err
}
// Read got EOF, so pipe closed on exec, so exec succeeded.
return pid, nil
}
type waitErr struct {
Waitmsg
err error
}
var procs struct {
sync.Mutex
waits map[int]chan *waitErr
}
// startProcess starts a new goroutine, tied to the OS
// thread, which runs the process and subsequently waits
// for it to finish, communicating the process stats back
// to any goroutines that may have been waiting on it.
//
// Such a dedicated goroutine is needed because on
// Plan 9, only the parent thread can wait for a child,
// whereas goroutines tend to jump OS threads (e.g.,
// between starting a process and running Wait(), the
// goroutine may have been rescheduled).
func startProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
type forkRet struct {
pid int
err error
}
forkc := make(chan forkRet, 1)
go func() {
runtime.LockOSThread()
var ret forkRet
ret.pid, ret.err = forkExec(argv0, argv, attr)
// If fork fails there is nothing to wait for.
if ret.err != nil || ret.pid == 0 {
forkc <- ret
return
}
waitc := make(chan *waitErr, 1)
// Mark that the process is running.
procs.Lock()
if procs.waits == nil {
procs.waits = make(map[int]chan *waitErr)
}
procs.waits[ret.pid] = waitc
procs.Unlock()
forkc <- ret
var w waitErr
for w.err == nil && w.Pid != ret.pid {
w.err = Await(&w.Waitmsg)
}
waitc <- &w
close(waitc)
}()
ret := <-forkc
return ret.pid, ret.err
}
// Combination of fork and exec, careful to be thread safe.
func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
return startProcess(argv0, argv, attr)
}
// StartProcess wraps [ForkExec] for package os.
func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
pid, err = startProcess(argv0, argv, attr)
return pid, 0, err
}
// Ordinary exec.
func Exec(argv0 string, argv []string, envv []string) (err error) {
if envv != nil {
r1, _, _ := RawSyscall(SYS_RFORK, RFCENVG, 0, 0)
if int32(r1) == -1 {
return NewError(errstr())
}
for _, v := range envv {
i := 0
for i < len(v) && v[i] != '=' {
i++
}
fd, e := Create("/env/"+v[:i], O_WRONLY, 0666)
if e != nil {
return e
}
_, e = Write(fd, []byte(v[i+1:]))
if e != nil {
Close(fd)
return e
}
Close(fd)
}
}
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return err
}
_, _, e1 := Syscall(SYS_EXEC,
uintptr(unsafe.Pointer(argv0p)),
uintptr(unsafe.Pointer(&argvp[0])),
0)
return e1
}
// WaitProcess waits until the pid of a
// running process is found in the queue of
// wait messages. It is used in conjunction
// with [ForkExec]/[StartProcess] to wait for a
// running process to exit.
func WaitProcess(pid int, w *Waitmsg) (err error) {
procs.Lock()
ch := procs.waits[pid]
procs.Unlock()
var wmsg *waitErr
if ch != nil {
wmsg = <-ch
procs.Lock()
if procs.waits[pid] == ch {
delete(procs.waits, pid)
}
procs.Unlock()
}
if wmsg == nil {
// ch was missing or ch is closed
return NewError("process not found")
}
if wmsg.err != nil {
return wmsg.err
}
if w != nil {
*w = wmsg.Waitmsg
}
return nil
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build solaris
package syscall
import "unsafe"
//go:cgo_import_dynamic libc_Getpgid getpgid "libc.so"
//go:cgo_import_dynamic libc_Getpgrp getpgrp "libc.so"
//go:linkname libc_Getpgid libc_Getpgid
//go:linkname libc_Getpgrp libc_Getpgrp
var (
libc_Getpgid,
libc_Getpgrp libcFunc
)
func Getpgid(pid int) (pgid int, err error) {
r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_Getpgid)), 1, uintptr(pid), 0, 0, 0, 0, 0)
pgid = int(r0)
if e1 != 0 {
err = e1
}
return
}
func Getpgrp() (pgrp int) {
r0, _, _ := sysvicall6(uintptr(unsafe.Pointer(&libc_Getpgrp)), 0, 0, 0, 0, 0, 0, 0)
pgrp = int(r0)
return
}
func Tcgetpgrp(fd int) (pgid int32, err error) {
if errno := ioctlPtr(uintptr(fd), TIOCGPGRP, unsafe.Pointer(&pgid)); errno != 0 {
return -1, errno
}
return pgid, nil
}
func Tcsetpgrp(fd int, pgid int32) (err error) {
return ioctlPtr(uintptr(fd), TIOCSPGRP, unsafe.Pointer(&pgid))
}

314
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
// Fork, exec, wait, etc.
package syscall
import (
errorspkg "errors"
"internal/bytealg"
"runtime"
"sync"
"unsafe"
)
// ForkLock is used to synchronize creation of new file descriptors
// with fork.
//
// We want the child in a fork/exec sequence to inherit only the
// file descriptors we intend. To do that, we mark all file
// descriptors close-on-exec and then, in the child, explicitly
// unmark the ones we want the exec'ed program to keep.
// Unix doesn't make this easy: there is, in general, no way to
// allocate a new file descriptor close-on-exec. Instead you
// have to allocate the descriptor and then mark it close-on-exec.
// If a fork happens between those two events, the child's exec
// will inherit an unwanted file descriptor.
//
// This lock solves that race: the create new fd/mark close-on-exec
// operation is done holding ForkLock for reading, and the fork itself
// is done holding ForkLock for writing. At least, that's the idea.
// There are some complications.
//
// Some system calls that create new file descriptors can block
// for arbitrarily long times: open on a hung NFS server or named
// pipe, accept on a socket, and so on. We can't reasonably grab
// the lock across those operations.
//
// It is worse to inherit some file descriptors than others.
// If a non-malicious child accidentally inherits an open ordinary file,
// that's not a big deal. On the other hand, if a long-lived child
// accidentally inherits the write end of a pipe, then the reader
// of that pipe will not see EOF until that child exits, potentially
// causing the parent program to hang. This is a common problem
// in threaded C programs that use popen.
//
// Luckily, the file descriptors that are most important not to
// inherit are not the ones that can take an arbitrarily long time
// to create: pipe returns instantly, and the net package uses
// non-blocking I/O to accept on a listening socket.
// The rules for which file descriptor-creating operations use the
// ForkLock are as follows:
//
// - [Pipe]. Use pipe2 if available. Otherwise, does not block,
// so use ForkLock.
// - [Socket]. Use SOCK_CLOEXEC if available. Otherwise, does not
// block, so use ForkLock.
// - [Open]. Use [O_CLOEXEC] if available. Otherwise, may block,
// so live with the race.
// - [Dup]. Use [F_DUPFD_CLOEXEC] or dup3 if available. Otherwise,
// does not block, so use ForkLock.
var ForkLock sync.RWMutex
// StringSlicePtr converts a slice of strings to a slice of pointers
// to NUL-terminated byte arrays. If any string contains a NUL byte
// this function panics instead of returning an error.
//
// Deprecated: Use [SlicePtrFromStrings] instead.
func StringSlicePtr(ss []string) []*byte {
bb := make([]*byte, len(ss)+1)
for i := 0; i < len(ss); i++ {
bb[i] = StringBytePtr(ss[i])
}
bb[len(ss)] = nil
return bb
}
// SlicePtrFromStrings converts a slice of strings to a slice of
// pointers to NUL-terminated byte arrays. If any string contains
// a NUL byte, it returns (nil, [EINVAL]).
func SlicePtrFromStrings(ss []string) ([]*byte, error) {
n := 0
for _, s := range ss {
if bytealg.IndexByteString(s, 0) != -1 {
return nil, EINVAL
}
n += len(s) + 1 // +1 for NUL
}
bb := make([]*byte, len(ss)+1)
b := make([]byte, n)
n = 0
for i, s := range ss {
bb[i] = &b[n]
copy(b[n:], s)
n += len(s) + 1
}
return bb, nil
}
func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
func SetNonblock(fd int, nonblocking bool) (err error) {
flag, err := fcntl(fd, F_GETFL, 0)
if err != nil {
return err
}
if (flag&O_NONBLOCK != 0) == nonblocking {
return nil
}
if nonblocking {
flag |= O_NONBLOCK
} else {
flag &^= O_NONBLOCK
}
_, err = fcntl(fd, F_SETFL, flag)
return err
}
// Credential holds user and group identities to be assumed
// by a child process started by [StartProcess].
type Credential struct {
Uid uint32 // User ID.
Gid uint32 // Group ID.
Groups []uint32 // Supplementary group IDs.
NoSetGroups bool // If true, don't set supplementary groups
}
// ProcAttr holds attributes that will be applied to a new process started
// by [StartProcess].
type ProcAttr struct {
Dir string // Current working directory.
Env []string // Environment.
Files []uintptr // File descriptors.
Sys *SysProcAttr
}
var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr
func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
var p [2]int
var n int
var err1 Errno
var wstatus WaitStatus
if attr == nil {
attr = &zeroProcAttr
}
sys := attr.Sys
if sys == nil {
sys = &zeroSysProcAttr
}
// Convert args to C form.
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return 0, err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return 0, err
}
envvp, err := SlicePtrFromStrings(attr.Env)
if err != nil {
return 0, err
}
if (runtime.GOOS == "freebsd" || runtime.GOOS == "dragonfly") && len(argv) > 0 && len(argv[0]) > len(argv0) {
argvp[0] = argv0p
}
var chroot *byte
if sys.Chroot != "" {
chroot, err = BytePtrFromString(sys.Chroot)
if err != nil {
return 0, err
}
}
var dir *byte
if attr.Dir != "" {
dir, err = BytePtrFromString(attr.Dir)
if err != nil {
return 0, err
}
}
// Both Setctty and Foreground use the Ctty field,
// but they give it slightly different meanings.
if sys.Setctty && sys.Foreground {
return 0, errorspkg.New("both Setctty and Foreground set in SysProcAttr")
}
if sys.Setctty && sys.Ctty >= len(attr.Files) {
return 0, errorspkg.New("Setctty set but Ctty not valid in child")
}
acquireForkLock()
// Allocate child status pipe close on exec.
if err = forkExecPipe(p[:]); err != nil {
releaseForkLock()
return 0, err
}
// Kick off child.
pid, err1 = forkAndExecInChild(argv0p, argvp, envvp, chroot, dir, attr, sys, p[1])
if err1 != 0 {
Close(p[0])
Close(p[1])
releaseForkLock()
return 0, Errno(err1)
}
releaseForkLock()
// Read child error status from pipe.
Close(p[1])
for {
n, err = readlen(p[0], (*byte)(unsafe.Pointer(&err1)), int(unsafe.Sizeof(err1)))
if err != EINTR {
break
}
}
Close(p[0])
if err != nil || n != 0 {
if n == int(unsafe.Sizeof(err1)) {
err = Errno(err1)
}
if err == nil {
err = EPIPE
}
// Child failed; wait for it to exit, to make sure
// the zombies don't accumulate.
_, err1 := Wait4(pid, &wstatus, 0, nil)
for err1 == EINTR {
_, err1 = Wait4(pid, &wstatus, 0, nil)
}
// OS-specific cleanup on failure.
forkAndExecFailureCleanup(attr, sys)
return 0, err
}
// Read got EOF, so pipe closed on exec, so exec succeeded.
return pid, nil
}
// Combination of fork and exec, careful to be thread safe.
func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
return forkExec(argv0, argv, attr)
}
// StartProcess wraps [ForkExec] for package os.
func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
pid, err = forkExec(argv0, argv, attr)
return pid, 0, err
}
// Implemented in runtime package.
func runtime_BeforeExec()
func runtime_AfterExec()
// execveLibc is non-nil on OS using libc syscall, set to execve in exec_libc.go; this
// avoids a build dependency for other platforms.
var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno
var execveDarwin func(path *byte, argv **byte, envp **byte) error
var execveOpenBSD func(path *byte, argv **byte, envp **byte) error
// Exec invokes the execve(2) system call.
func Exec(argv0 string, argv []string, envv []string) (err error) {
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return err
}
envvp, err := SlicePtrFromStrings(envv)
if err != nil {
return err
}
runtime_BeforeExec()
rlim := origRlimitNofile.Load()
if rlim != nil {
Setrlimit(RLIMIT_NOFILE, rlim)
}
var err1 error
if runtime.GOOS == "solaris" || runtime.GOOS == "illumos" || runtime.GOOS == "aix" {
// RawSyscall should never be used on Solaris, illumos, or AIX.
err1 = execveLibc(
uintptr(unsafe.Pointer(argv0p)),
uintptr(unsafe.Pointer(&argvp[0])),
uintptr(unsafe.Pointer(&envvp[0])))
} else if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
// Similarly on Darwin.
err1 = execveDarwin(argv0p, &argvp[0], &envvp[0])
} else if runtime.GOOS == "openbsd" && runtime.GOARCH != "mips64" {
// Similarly on OpenBSD.
err1 = execveOpenBSD(argv0p, &argvp[0], &envvp[0])
} else {
_, _, err1 = RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0p)),
uintptr(unsafe.Pointer(&argvp[0])),
uintptr(unsafe.Pointer(&envvp[0])))
}
runtime_AfterExec()
return err1
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package syscall_test
import (
"bytes"
"fmt"
"internal/testenv"
"io"
"math/rand"
"os"
"os/exec"
"os/signal"
"strconv"
"syscall"
"testing"
"time"
)
type command struct {
pipe io.WriteCloser
proc *exec.Cmd
test *testing.T
}
func (c *command) Info() (pid, pgrp int) {
pid = c.proc.Process.Pid
pgrp, err := syscall.Getpgid(pid)
if err != nil {
c.test.Fatal(err)
}
return
}
func (c *command) Start() {
if err := c.proc.Start(); err != nil {
c.test.Fatal(err)
}
}
func (c *command) Stop() {
c.pipe.Close()
if err := c.proc.Wait(); err != nil {
c.test.Fatal(err)
}
}
func create(t *testing.T) *command {
testenv.MustHaveExec(t)
proc := exec.Command("cat")
stdin, err := proc.StdinPipe()
if err != nil {
t.Fatal(err)
}
return &command{stdin, proc, t}
}
func parent() (pid, pgrp int) {
return syscall.Getpid(), syscall.Getpgrp()
}
func TestZeroSysProcAttr(t *testing.T) {
ppid, ppgrp := parent()
cmd := create(t)
cmd.Start()
defer cmd.Stop()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp != ppgrp {
t.Fatalf("Child is not in parent's process group")
}
}
func TestSetpgid(t *testing.T) {
ppid, ppgrp := parent()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
cmd.Start()
defer cmd.Stop()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp == ppgrp {
t.Fatalf("Parent and child are in the same process group")
}
if cpid != cpgrp {
t.Fatalf("Child's process group is not the child's process ID")
}
}
func TestPgid(t *testing.T) {
ppid, ppgrp := parent()
cmd1 := create(t)
cmd1.proc.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
cmd1.Start()
defer cmd1.Stop()
cpid1, cpgrp1 := cmd1.Info()
if cpid1 == ppid {
t.Fatalf("Parent and child 1 have the same process ID")
}
if cpgrp1 == ppgrp {
t.Fatalf("Parent and child 1 are in the same process group")
}
if cpid1 != cpgrp1 {
t.Fatalf("Child 1's process group is not its process ID")
}
cmd2 := create(t)
cmd2.proc.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
Pgid: cpgrp1,
}
cmd2.Start()
defer cmd2.Stop()
cpid2, cpgrp2 := cmd2.Info()
if cpid2 == ppid {
t.Fatalf("Parent and child 2 have the same process ID")
}
if cpgrp2 == ppgrp {
t.Fatalf("Parent and child 2 are in the same process group")
}
if cpid2 == cpgrp2 {
t.Fatalf("Child 2's process group is its process ID")
}
if cpid1 == cpid2 {
t.Fatalf("Child 1 and 2 have the same process ID")
}
if cpgrp1 != cpgrp2 {
t.Fatalf("Child 1 and 2 are not in the same process group")
}
}
func TestForeground(t *testing.T) {
signal.Ignore(syscall.SIGTTIN, syscall.SIGTTOU)
defer signal.Reset()
tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
if err != nil {
t.Skipf("Can't test Foreground. Couldn't open /dev/tty: %s", err)
}
defer tty.Close()
ttyFD := int(tty.Fd())
fpgrp, err := syscall.Tcgetpgrp(ttyFD)
if err != nil {
t.Fatalf("Tcgetpgrp failed: %v", err)
}
if fpgrp == 0 {
t.Fatalf("Foreground process group is zero")
}
ppid, ppgrp := parent()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Ctty: ttyFD,
Foreground: true,
}
cmd.Start()
cpid, cpgrp := cmd.Info()
if cpid == ppid {
t.Fatalf("Parent and child have the same process ID")
}
if cpgrp == ppgrp {
t.Fatalf("Parent and child are in the same process group")
}
if cpid != cpgrp {
t.Fatalf("Child's process group is not the child's process ID")
}
cmd.Stop()
// This call fails on darwin/arm64. The failure doesn't matter, though.
// This is just best effort.
syscall.Tcsetpgrp(ttyFD, fpgrp)
}
func TestForegroundSignal(t *testing.T) {
tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
if err != nil {
t.Skipf("couldn't open /dev/tty: %s", err)
}
defer tty.Close()
ttyFD := int(tty.Fd())
fpgrp, err := syscall.Tcgetpgrp(ttyFD)
if err != nil {
t.Fatalf("Tcgetpgrp failed: %v", err)
}
if fpgrp == 0 {
t.Fatalf("Foreground process group is zero")
}
defer func() {
signal.Ignore(syscall.SIGTTIN, syscall.SIGTTOU)
syscall.Tcsetpgrp(ttyFD, fpgrp)
signal.Reset()
}()
ch1 := make(chan os.Signal, 1)
ch2 := make(chan bool)
signal.Notify(ch1, syscall.SIGTTIN, syscall.SIGTTOU)
defer signal.Stop(ch1)
cmd := create(t)
go func() {
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Ctty: ttyFD,
Foreground: true,
}
cmd.Start()
cmd.Stop()
close(ch2)
}()
timer := time.NewTimer(30 * time.Second)
defer timer.Stop()
for {
select {
case sig := <-ch1:
t.Errorf("unexpected signal %v", sig)
case <-ch2:
// Success.
return
case <-timer.C:
t.Fatal("timed out waiting for child process")
}
}
}
// Test a couple of cases that SysProcAttr can't handle. Issue 29458.
func TestInvalidExec(t *testing.T) {
t.Parallel()
t.Run("SetCtty-Foreground", func(t *testing.T) {
t.Parallel()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Setctty: true,
Foreground: true,
Ctty: 0,
}
if err := cmd.proc.Start(); err == nil {
t.Error("expected error setting both SetCtty and Foreground")
}
})
t.Run("invalid-Ctty", func(t *testing.T) {
t.Parallel()
cmd := create(t)
cmd.proc.SysProcAttr = &syscall.SysProcAttr{
Setctty: true,
Ctty: 3,
}
if err := cmd.proc.Start(); err == nil {
t.Error("expected error with invalid Ctty value")
}
})
}
// TestExec is for issue #41702.
func TestExec(t *testing.T) {
testenv.MustHaveExec(t)
cmd := exec.Command(os.Args[0], "-test.run=^TestExecHelper$")
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=2")
o, err := cmd.CombinedOutput()
if err != nil {
t.Errorf("%s\n%v", o, err)
}
}
// TestExecHelper is used by TestExec. It does nothing by itself.
// In testing on macOS 10.14, this used to fail with
// "signal: illegal instruction" more than half the time.
func TestExecHelper(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") != "2" {
return
}
// We don't have to worry about restoring these values.
// We are in a child process that only runs this test,
// and we are going to call syscall.Exec anyhow.
os.Setenv("GO_WANT_HELPER_PROCESS", "3")
stop := time.Now().Add(time.Second)
for i := 0; i < 100; i++ {
go func(i int) {
r := rand.New(rand.NewSource(int64(i)))
for time.Now().Before(stop) {
r.Uint64()
}
}(i)
}
time.Sleep(10 * time.Millisecond)
argv := []string{os.Args[0], "-test.run=^TestExecHelper$"}
syscall.Exec(os.Args[0], argv, os.Environ())
t.Error("syscall.Exec returned")
}
// Test that rlimit values are restored by exec.
func TestRlimitRestored(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") != "" {
fmt.Println(syscall.OrigRlimitNofile().Cur)
os.Exit(0)
}
orig := syscall.OrigRlimitNofile()
if orig == nil {
t.Skip("skipping test because rlimit not adjusted at startup")
}
executable, err := os.Executable()
if err != nil {
executable = os.Args[0]
}
cmd := testenv.Command(t, executable, "-test.run=^TestRlimitRestored$")
cmd = testenv.CleanCmdEnv(cmd)
cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
out, err := cmd.CombinedOutput()
if len(out) > 0 {
t.Logf("%s", out)
}
if err != nil {
t.Fatalf("subprocess failed: %v", err)
}
s := string(bytes.TrimSpace(out))
v, err := strconv.ParseUint(s, 10, 64)
if err != nil {
t.Fatalf("could not parse %q as number: %v", s, v)
}
if v != uint64(orig.Cur) {
t.Errorf("exec rlimit = %d, want %d", v, orig)
}
}
func TestForkExecNilArgv(t *testing.T) {
defer func() {
if p := recover(); p != nil {
t.Fatal("forkExec panicked")
}
}()
// We don't really care what the result of forkExec is, just that it doesn't
// panic, so we choose something we know won't actually spawn a process (probably).
syscall.ForkExec("/dev/null", nil, nil)
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fork, exec, wait, etc.
package syscall
import (
"internal/bytealg"
"runtime"
"sync"
"unicode/utf16"
"unsafe"
)
// ForkLock is not used on Windows.
var ForkLock sync.RWMutex
// EscapeArg rewrites command line argument s as prescribed
// in https://msdn.microsoft.com/en-us/library/ms880421.
// This function returns "" (2 double quotes) if s is empty.
// Alternatively, these transformations are done:
// - every back slash (\) is doubled, but only if immediately
// followed by double quote (");
// - every double quote (") is escaped by back slash (\);
// - finally, s is wrapped with double quotes (arg -> "arg"),
// but only if there is space or tab inside s.
func EscapeArg(s string) string {
if len(s) == 0 {
return `""`
}
for i := 0; i < len(s); i++ {
switch s[i] {
case '"', '\\', ' ', '\t':
// Some escaping required.
b := make([]byte, 0, len(s)+2)
b = appendEscapeArg(b, s)
return string(b)
}
}
return s
}
// appendEscapeArg escapes the string s, as per escapeArg,
// appends the result to b, and returns the updated slice.
func appendEscapeArg(b []byte, s string) []byte {
if len(s) == 0 {
return append(b, `""`...)
}
needsBackslash := false
hasSpace := false
for i := 0; i < len(s); i++ {
switch s[i] {
case '"', '\\':
needsBackslash = true
case ' ', '\t':
hasSpace = true
}
}
if !needsBackslash && !hasSpace {
// No special handling required; normal case.
return append(b, s...)
}
if !needsBackslash {
// hasSpace is true, so we need to quote the string.
b = append(b, '"')
b = append(b, s...)
return append(b, '"')
}
if hasSpace {
b = append(b, '"')
}
slashes := 0
for i := 0; i < len(s); i++ {
c := s[i]
switch c {
default:
slashes = 0
case '\\':
slashes++
case '"':
for ; slashes > 0; slashes-- {
b = append(b, '\\')
}
b = append(b, '\\')
}
b = append(b, c)
}
if hasSpace {
for ; slashes > 0; slashes-- {
b = append(b, '\\')
}
b = append(b, '"')
}
return b
}
// makeCmdLine builds a command line out of args by escaping "special"
// characters and joining the arguments with spaces.
func makeCmdLine(args []string) string {
var b []byte
for _, v := range args {
if len(b) > 0 {
b = append(b, ' ')
}
b = appendEscapeArg(b, v)
}
return string(b)
}
// createEnvBlock converts an array of environment strings into
// the representation required by CreateProcess: a sequence of NUL
// terminated strings followed by a nil.
// Last bytes are two UCS-2 NULs, or four NUL bytes.
// If any string contains a NUL, it returns (nil, EINVAL).
func createEnvBlock(envv []string) ([]uint16, error) {
if len(envv) == 0 {
return utf16.Encode([]rune("\x00\x00")), nil
}
var length int
for _, s := range envv {
if bytealg.IndexByteString(s, 0) != -1 {
return nil, EINVAL
}
length += len(s) + 1
}
length += 1
b := make([]uint16, 0, length)
for _, s := range envv {
for _, c := range s {
b = utf16.AppendRune(b, c)
}
b = utf16.AppendRune(b, 0)
}
b = utf16.AppendRune(b, 0)
return b, nil
}
func CloseOnExec(fd Handle) {
SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
}
func SetNonblock(fd Handle, nonblocking bool) (err error) {
return nil
}
// FullPath retrieves the full path of the specified file.
func FullPath(name string) (path string, err error) {
p, err := UTF16PtrFromString(name)
if err != nil {
return "", err
}
n := uint32(100)
for {
buf := make([]uint16, n)
n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
if err != nil {
return "", err
}
if n <= uint32(len(buf)) {
return UTF16ToString(buf[:n]), nil
}
}
}
func isSlash(c uint8) bool {
return c == '\\' || c == '/'
}
func normalizeDir(dir string) (name string, err error) {
ndir, err := FullPath(dir)
if err != nil {
return "", err
}
if len(ndir) > 2 && isSlash(ndir[0]) && isSlash(ndir[1]) {
// dir cannot have \\server\share\path form
return "", EINVAL
}
return ndir, nil
}
func volToUpper(ch int) int {
if 'a' <= ch && ch <= 'z' {
ch += 'A' - 'a'
}
return ch
}
func joinExeDirAndFName(dir, p string) (name string, err error) {
if len(p) == 0 {
return "", EINVAL
}
if len(p) > 2 && isSlash(p[0]) && isSlash(p[1]) {
// \\server\share\path form
return p, nil
}
if len(p) > 1 && p[1] == ':' {
// has drive letter
if len(p) == 2 {
return "", EINVAL
}
if isSlash(p[2]) {
return p, nil
} else {
d, err := normalizeDir(dir)
if err != nil {
return "", err
}
if volToUpper(int(p[0])) == volToUpper(int(d[0])) {
return FullPath(d + "\\" + p[2:])
} else {
return FullPath(p)
}
}
} else {
// no drive letter
d, err := normalizeDir(dir)
if err != nil {
return "", err
}
if isSlash(p[0]) {
return FullPath(d[:2] + p)
} else {
return FullPath(d + "\\" + p)
}
}
}
type ProcAttr struct {
Dir string
Env []string
Files []uintptr
Sys *SysProcAttr
}
type SysProcAttr struct {
HideWindow bool
CmdLine string // used if non-empty, else the windows command line is built by escaping the arguments passed to StartProcess
CreationFlags uint32
Token Token // if set, runs new process in the security context represented by the token
ProcessAttributes *SecurityAttributes // if set, applies these security attributes as the descriptor for the new process
ThreadAttributes *SecurityAttributes // if set, applies these security attributes as the descriptor for the main thread of the new process
NoInheritHandles bool // if set, no handles are inherited by the new process, not even the standard handles, contained in ProcAttr.Files, nor the ones contained in AdditionalInheritedHandles
AdditionalInheritedHandles []Handle // a list of additional handles, already marked as inheritable, that will be inherited by the new process
ParentProcess Handle // if non-zero, the new process regards the process given by this handle as its parent process, and AdditionalInheritedHandles, if set, should exist in this parent process
}
var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr
func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
if len(argv0) == 0 {
return 0, 0, EWINDOWS
}
if attr == nil {
attr = &zeroProcAttr
}
sys := attr.Sys
if sys == nil {
sys = &zeroSysProcAttr
}
if len(attr.Files) > 3 {
return 0, 0, EWINDOWS
}
if len(attr.Files) < 3 {
return 0, 0, EINVAL
}
if len(attr.Dir) != 0 {
// StartProcess assumes that argv0 is relative to attr.Dir,
// because it implies Chdir(attr.Dir) before executing argv0.
// Windows CreateProcess assumes the opposite: it looks for
// argv0 relative to the current directory, and, only once the new
// process is started, it does Chdir(attr.Dir). We are adjusting
// for that difference here by making argv0 absolute.
var err error
argv0, err = joinExeDirAndFName(attr.Dir, argv0)
if err != nil {
return 0, 0, err
}
}
argv0p, err := UTF16PtrFromString(argv0)
if err != nil {
return 0, 0, err
}
var cmdline string
// Windows CreateProcess takes the command line as a single string:
// use attr.CmdLine if set, else build the command line by escaping
// and joining each argument with spaces
if sys.CmdLine != "" {
cmdline = sys.CmdLine
} else {
cmdline = makeCmdLine(argv)
}
var argvp *uint16
if len(cmdline) != 0 {
argvp, err = UTF16PtrFromString(cmdline)
if err != nil {
return 0, 0, err
}
}
var dirp *uint16
if len(attr.Dir) != 0 {
dirp, err = UTF16PtrFromString(attr.Dir)
if err != nil {
return 0, 0, err
}
}
p, _ := GetCurrentProcess()
parentProcess := p
if sys.ParentProcess != 0 {
parentProcess = sys.ParentProcess
}
fd := make([]Handle, len(attr.Files))
for i := range attr.Files {
if attr.Files[i] > 0 {
err := DuplicateHandle(p, Handle(attr.Files[i]), parentProcess, &fd[i], 0, true, DUPLICATE_SAME_ACCESS)
if err != nil {
return 0, 0, err
}
defer DuplicateHandle(parentProcess, fd[i], 0, nil, 0, false, DUPLICATE_CLOSE_SOURCE)
}
}
si := new(_STARTUPINFOEXW)
si.ProcThreadAttributeList, err = newProcThreadAttributeList(2)
if err != nil {
return 0, 0, err
}
defer deleteProcThreadAttributeList(si.ProcThreadAttributeList)
si.Cb = uint32(unsafe.Sizeof(*si))
si.Flags = STARTF_USESTDHANDLES
if sys.HideWindow {
si.Flags |= STARTF_USESHOWWINDOW
si.ShowWindow = SW_HIDE
}
if sys.ParentProcess != 0 {
err = updateProcThreadAttribute(si.ProcThreadAttributeList, 0, _PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, unsafe.Pointer(&sys.ParentProcess), unsafe.Sizeof(sys.ParentProcess), nil, nil)
if err != nil {
return 0, 0, err
}
}
si.StdInput = fd[0]
si.StdOutput = fd[1]
si.StdErr = fd[2]
fd = append(fd, sys.AdditionalInheritedHandles...)
// The presence of a NULL handle in the list is enough to cause PROC_THREAD_ATTRIBUTE_HANDLE_LIST
// to treat the entire list as empty, so remove NULL handles.
j := 0
for i := range fd {
if fd[i] != 0 {
fd[j] = fd[i]
j++
}
}
fd = fd[:j]
willInheritHandles := len(fd) > 0 && !sys.NoInheritHandles
// Do not accidentally inherit more than these handles.
if willInheritHandles {
err = updateProcThreadAttribute(si.ProcThreadAttributeList, 0, _PROC_THREAD_ATTRIBUTE_HANDLE_LIST, unsafe.Pointer(&fd[0]), uintptr(len(fd))*unsafe.Sizeof(fd[0]), nil, nil)
if err != nil {
return 0, 0, err
}
}
envBlock, err := createEnvBlock(attr.Env)
if err != nil {
return 0, 0, err
}
pi := new(ProcessInformation)
flags := sys.CreationFlags | CREATE_UNICODE_ENVIRONMENT | _EXTENDED_STARTUPINFO_PRESENT
if sys.Token != 0 {
err = CreateProcessAsUser(sys.Token, argv0p, argvp, sys.ProcessAttributes, sys.ThreadAttributes, willInheritHandles, flags, &envBlock[0], dirp, &si.StartupInfo, pi)
} else {
err = CreateProcess(argv0p, argvp, sys.ProcessAttributes, sys.ThreadAttributes, willInheritHandles, flags, &envBlock[0], dirp, &si.StartupInfo, pi)
}
if err != nil {
return 0, 0, err
}
defer CloseHandle(Handle(pi.Thread))
runtime.KeepAlive(fd)
runtime.KeepAlive(sys)
return int(pi.ProcessId), uintptr(pi.Process), nil
}
func Exec(argv0 string, argv []string, envv []string) (err error) {
return EWINDOWS
}

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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall_test
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"syscall"
"testing"
"time"
)
func TestEscapeArg(t *testing.T) {
var tests = []struct {
input, output string
}{
{``, `""`},
{`a`, `a`},
{` `, `" "`},
{`\`, `\`},
{`"`, `\"`},
{`\"`, `\\\"`},
{`\\"`, `\\\\\"`},
{`\\ `, `"\\ "`},
{` \\`, `" \\\\"`},
{`a `, `"a "`},
{`C:\`, `C:\`},
{`C:\Program Files (x32)\Common\`, `"C:\Program Files (x32)\Common\\"`},
{`C:\Users\Игорь\`, `C:\Users\Игорь\`},
{`Андрей\file`, `Андрей\file`},
{`C:\Windows\temp`, `C:\Windows\temp`},
{`c:\temp\newfile`, `c:\temp\newfile`},
{`\\?\C:\Windows`, `\\?\C:\Windows`},
{`\\?\`, `\\?\`},
{`\\.\C:\Windows\`, `\\.\C:\Windows\`},
{`\\server\share\file`, `\\server\share\file`},
{`\\newserver\tempshare\really.txt`, `\\newserver\tempshare\really.txt`},
}
for _, test := range tests {
if got := syscall.EscapeArg(test.input); got != test.output {
t.Errorf("EscapeArg(%#q) = %#q, want %#q", test.input, got, test.output)
}
}
}
func TestChangingProcessParent(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") == "parent" {
// in parent process
// Parent does nothing. It is just used as a parent of a child process.
time.Sleep(time.Minute)
os.Exit(0)
}
if os.Getenv("GO_WANT_HELPER_PROCESS") == "child" {
// in child process
dumpPath := os.Getenv("GO_WANT_HELPER_PROCESS_FILE")
if dumpPath == "" {
fmt.Fprintf(os.Stderr, "Dump file path cannot be blank.")
os.Exit(1)
}
err := os.WriteFile(dumpPath, []byte(fmt.Sprintf("%d", os.Getppid())), 0644)
if err != nil {
fmt.Fprintf(os.Stderr, "Error writing dump file: %v", err)
os.Exit(2)
}
os.Exit(0)
}
// run parent process
parent := exec.Command(os.Args[0], "-test.run=^TestChangingProcessParent$")
parent.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=parent")
err := parent.Start()
if err != nil {
t.Fatal(err)
}
defer func() {
parent.Process.Kill()
parent.Wait()
}()
// run child process
const _PROCESS_CREATE_PROCESS = 0x0080
const _PROCESS_DUP_HANDLE = 0x0040
childDumpPath := filepath.Join(t.TempDir(), "ppid.txt")
ph, err := syscall.OpenProcess(_PROCESS_CREATE_PROCESS|_PROCESS_DUP_HANDLE|syscall.PROCESS_QUERY_INFORMATION,
false, uint32(parent.Process.Pid))
if err != nil {
t.Fatal(err)
}
defer syscall.CloseHandle(ph)
child := exec.Command(os.Args[0], "-test.run=^TestChangingProcessParent$")
child.Env = append(os.Environ(),
"GO_WANT_HELPER_PROCESS=child",
"GO_WANT_HELPER_PROCESS_FILE="+childDumpPath)
child.SysProcAttr = &syscall.SysProcAttr{ParentProcess: ph}
childOutput, err := child.CombinedOutput()
if err != nil {
t.Errorf("child failed: %v: %v", err, string(childOutput))
}
childOutput, err = os.ReadFile(childDumpPath)
if err != nil {
t.Fatalf("reading child output failed: %v", err)
}
if got, want := string(childOutput), fmt.Sprintf("%d", parent.Process.Pid); got != want {
t.Fatalf("child output: want %q, got %q", want, got)
}
}

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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
package syscall
import (
"unsafe"
)
// pgid should really be pid_t, however _C_int (aka int32) is generally
// equivalent.
func Tcgetpgrp(fd int) (pgid int32, err error) {
if err := ioctlPtr(fd, TIOCGPGRP, unsafe.Pointer(&pgid)); err != nil {
return -1, err
}
return pgid, nil
}
func Tcsetpgrp(fd int, pgid int32) (err error) {
return ioctlPtr(fd, TIOCSPGRP, unsafe.Pointer(&pgid))
}

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src/syscall/export_linux_test.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import (
"unsafe"
)
var (
RawSyscallNoError = rawSyscallNoError
ForceClone3 = &forceClone3
Prlimit = prlimit
)
const (
Sys_GETEUID = sys_GETEUID
)
func Tcgetpgrp(fd int) (pgid int32, err error) {
_, _, errno := Syscall6(SYS_IOCTL, uintptr(fd), uintptr(TIOCGPGRP), uintptr(unsafe.Pointer(&pgid)), 0, 0, 0)
if errno != 0 {
return -1, errno
}
return pgid, nil
}
func Tcsetpgrp(fd int, pgid int32) (err error) {
_, _, errno := Syscall6(SYS_IOCTL, uintptr(fd), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgid)), 0, 0, 0)
if errno != 0 {
return errno
}
return nil
}

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src/syscall/export_rlimit_test.go Normal file
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package syscall
import "sync/atomic"
func OrigRlimitNofile() *Rlimit {
return origRlimitNofile.Load()
}
func GetInternalOrigRlimitNofile() *atomic.Pointer[Rlimit] {
return &origRlimitNofile
}

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src/syscall/export_wasip1_test.go Normal file
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build wasip1
package syscall
func JoinPath(dir, file string) string {
return joinPath(dir, file)
}

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src/syscall/export_windows_test.go Normal file
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
var NewProcThreadAttributeList = newProcThreadAttributeList
var UpdateProcThreadAttribute = updateProcThreadAttribute
var DeleteProcThreadAttributeList = deleteProcThreadAttributeList
const PROC_THREAD_ATTRIBUTE_HANDLE_LIST = _PROC_THREAD_ATTRIBUTE_HANDLE_LIST
var EncodeWTF16 = encodeWTF16
var DecodeWTF16 = decodeWTF16

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src/syscall/flock_aix.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import "unsafe"
// On AIX, there is no flock() system call.
// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error) {
_, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_fcntl)), 3, uintptr(fd), uintptr(cmd), uintptr(unsafe.Pointer(lk)), 0, 0, 0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}

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src/syscall/flock_bsd.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
package syscall
import "unsafe"
// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
_, err := fcntlPtr(int(fd), cmd, unsafe.Pointer(lk))
return err
}

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src/syscall/flock_linux.go Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import "unsafe"
// fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
// systems by flock_linux_32bit.go to be SYS_FCNTL64.
var fcntl64Syscall uintptr = SYS_FCNTL
// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
if errno == 0 {
return nil
}
return errno
}

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src/syscall/flock_linux_32bit.go Normal file
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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (linux && 386) || (linux && arm) || (linux && mips) || (linux && mipsle)
package syscall
func init() {
// On 32-bit Linux systems, the fcntl syscall that matches Go's
// Flock_t type is SYS_FCNTL64, not SYS_FCNTL.
fcntl64Syscall = SYS_FCNTL64
}

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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || darwin
package syscall
// forkExecPipe opens a pipe and non-atomically sets O_CLOEXEC on both file
// descriptors.
func forkExecPipe(p []int) error {
err := Pipe(p)
if err != nil {
return err
}
_, err = fcntl(p[0], F_SETFD, FD_CLOEXEC)
if err != nil {
return err
}
_, err = fcntl(p[1], F_SETFD, FD_CLOEXEC)
return err
}
func acquireForkLock() {
ForkLock.Lock()
}
func releaseForkLock() {
ForkLock.Unlock()
}

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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build dragonfly || freebsd || linux || netbsd || openbsd || solaris
package syscall
import "sync"
// forkExecPipe atomically opens a pipe with O_CLOEXEC set on both file
// descriptors.
func forkExecPipe(p []int) error {
return Pipe2(p, O_CLOEXEC)
}
var (
// Guard the forking variable.
forkingLock sync.Mutex
// Number of goroutines currently forking, and thus the
// number of goroutines holding a conceptual write lock
// on ForkLock.
forking int
)
// hasWaitingReaders reports whether any goroutine is waiting
// to acquire a read lock on rw. It is defined in the sync package.
func hasWaitingReaders(rw *sync.RWMutex) bool
// acquireForkLock acquires a write lock on ForkLock.
// ForkLock is exported and we've promised that during a fork
// we will call ForkLock.Lock, so that no other threads create
// new fds that are not yet close-on-exec before we fork.
// But that forces all fork calls to be serialized, which is bad.
// But we haven't promised that serialization, and it is essentially
// undetectable by other users of ForkLock, which is good.
// Avoid the serialization by ensuring that ForkLock is locked
// at the first fork and unlocked when there are no more forks.
func acquireForkLock() {
forkingLock.Lock()
defer forkingLock.Unlock()
if forking == 0 {
// There is no current write lock on ForkLock.
ForkLock.Lock()
forking++
return
}
// ForkLock is currently locked for writing.
if hasWaitingReaders(&ForkLock) {
// ForkLock is locked for writing, and at least one
// goroutine is waiting to read from it.
// To avoid lock starvation, allow readers to proceed.
// The simple way to do this is for us to acquire a
// read lock. That will block us until all current
// conceptual write locks are released.
//
// Note that this case is unusual on modern systems
// with O_CLOEXEC and SOCK_CLOEXEC. On those systems
// the standard library should never take a read
// lock on ForkLock.
forkingLock.Unlock()
ForkLock.RLock()
ForkLock.RUnlock()
forkingLock.Lock()
// Readers got a chance, so now take the write lock.
if forking == 0 {
ForkLock.Lock()
}
}
forking++
}
// releaseForkLock releases the conceptual write lock on ForkLock
// acquired by acquireForkLock.
func releaseForkLock() {
forkingLock.Lock()
defer forkingLock.Unlock()
if forking <= 0 {
panic("syscall.releaseForkLock: negative count")
}
forking--
if forking == 0 {
// No more conceptual write locks.
ForkLock.Unlock()
}
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js && wasm
package syscall
import (
"errors"
"sync"
"syscall/js"
)
// Provided by package runtime.
func now() (sec int64, nsec int32)
var jsProcess = js.Global().Get("process")
var jsFS = js.Global().Get("fs")
var constants = jsFS.Get("constants")
var uint8Array = js.Global().Get("Uint8Array")
var (
nodeWRONLY = constants.Get("O_WRONLY").Int()
nodeRDWR = constants.Get("O_RDWR").Int()
nodeCREATE = constants.Get("O_CREAT").Int()
nodeTRUNC = constants.Get("O_TRUNC").Int()
nodeAPPEND = constants.Get("O_APPEND").Int()
nodeEXCL = constants.Get("O_EXCL").Int()
)
type jsFile struct {
path string
entries []string
dirIdx int // entries[:dirIdx] have already been returned in ReadDirent
pos int64
seeked bool
}
var filesMu sync.Mutex
var files = map[int]*jsFile{
0: {},
1: {},
2: {},
}
func fdToFile(fd int) (*jsFile, error) {
filesMu.Lock()
f, ok := files[fd]
filesMu.Unlock()
if !ok {
return nil, EBADF
}
return f, nil
}
func Open(path string, openmode int, perm uint32) (int, error) {
if err := checkPath(path); err != nil {
return 0, err
}
flags := 0
if openmode&O_WRONLY != 0 {
flags |= nodeWRONLY
}
if openmode&O_RDWR != 0 {
flags |= nodeRDWR
}
if openmode&O_CREATE != 0 {
flags |= nodeCREATE
}
if openmode&O_TRUNC != 0 {
flags |= nodeTRUNC
}
if openmode&O_APPEND != 0 {
flags |= nodeAPPEND
}
if openmode&O_EXCL != 0 {
flags |= nodeEXCL
}
if openmode&O_SYNC != 0 {
return 0, errors.New("syscall.Open: O_SYNC is not supported by js/wasm")
}
jsFD, err := fsCall("open", path, flags, perm)
if err != nil {
return 0, err
}
fd := jsFD.Int()
var entries []string
if stat, err := fsCall("fstat", fd); err == nil && stat.Call("isDirectory").Bool() {
dir, err := fsCall("readdir", path)
if err != nil {
return 0, err
}
entries = make([]string, dir.Length())
for i := range entries {
entries[i] = dir.Index(i).String()
}
}
if path[0] != '/' {
cwd := jsProcess.Call("cwd").String()
path = cwd + "/" + path
}
f := &jsFile{
path: path,
entries: entries,
}
filesMu.Lock()
files[fd] = f
filesMu.Unlock()
return fd, nil
}
func Close(fd int) error {
filesMu.Lock()
delete(files, fd)
filesMu.Unlock()
_, err := fsCall("close", fd)
return err
}
func CloseOnExec(fd int) {
// nothing to do - no exec
}
func Mkdir(path string, perm uint32) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("mkdir", path, perm)
return err
}
func ReadDirent(fd int, buf []byte) (int, error) {
f, err := fdToFile(fd)
if err != nil {
return 0, err
}
if f.entries == nil {
return 0, EINVAL
}
n := 0
for f.dirIdx < len(f.entries) {
entry := f.entries[f.dirIdx]
l := 2 + len(entry)
if l > len(buf) {
break
}
buf[0] = byte(l)
buf[1] = byte(l >> 8)
copy(buf[2:], entry)
buf = buf[l:]
n += l
f.dirIdx++
}
return n, nil
}
func setStat(st *Stat_t, jsSt js.Value) {
st.Dev = int64(jsSt.Get("dev").Int())
st.Ino = uint64(jsSt.Get("ino").Int())
st.Mode = uint32(jsSt.Get("mode").Int())
st.Nlink = uint32(jsSt.Get("nlink").Int())
st.Uid = uint32(jsSt.Get("uid").Int())
st.Gid = uint32(jsSt.Get("gid").Int())
st.Rdev = int64(jsSt.Get("rdev").Int())
st.Size = int64(jsSt.Get("size").Int())
st.Blksize = int32(jsSt.Get("blksize").Int())
st.Blocks = int32(jsSt.Get("blocks").Int())
atime := int64(jsSt.Get("atimeMs").Int())
st.Atime = atime / 1000
st.AtimeNsec = (atime % 1000) * 1000000
mtime := int64(jsSt.Get("mtimeMs").Int())
st.Mtime = mtime / 1000
st.MtimeNsec = (mtime % 1000) * 1000000
ctime := int64(jsSt.Get("ctimeMs").Int())
st.Ctime = ctime / 1000
st.CtimeNsec = (ctime % 1000) * 1000000
}
func Stat(path string, st *Stat_t) error {
if err := checkPath(path); err != nil {
return err
}
jsSt, err := fsCall("stat", path)
if err != nil {
return err
}
setStat(st, jsSt)
return nil
}
func Lstat(path string, st *Stat_t) error {
if err := checkPath(path); err != nil {
return err
}
jsSt, err := fsCall("lstat", path)
if err != nil {
return err
}
setStat(st, jsSt)
return nil
}
func Fstat(fd int, st *Stat_t) error {
jsSt, err := fsCall("fstat", fd)
if err != nil {
return err
}
setStat(st, jsSt)
return nil
}
func Unlink(path string) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("unlink", path)
return err
}
func Rmdir(path string) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("rmdir", path)
return err
}
func Chmod(path string, mode uint32) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("chmod", path, mode)
return err
}
func Fchmod(fd int, mode uint32) error {
_, err := fsCall("fchmod", fd, mode)
return err
}
func Chown(path string, uid, gid int) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("chown", path, uint32(uid), uint32(gid))
return err
}
func Fchown(fd int, uid, gid int) error {
_, err := fsCall("fchown", fd, uint32(uid), uint32(gid))
return err
}
func Lchown(path string, uid, gid int) error {
if err := checkPath(path); err != nil {
return err
}
if jsFS.Get("lchown").IsUndefined() {
// fs.lchown is unavailable on Linux until Node.js 10.6.0
// TODO(neelance): remove when we require at least this Node.js version
return ENOSYS
}
_, err := fsCall("lchown", path, uint32(uid), uint32(gid))
return err
}
func UtimesNano(path string, ts []Timespec) error {
// UTIME_OMIT value must match internal/syscall/unix/at_js.go
const UTIME_OMIT = -0x2
if err := checkPath(path); err != nil {
return err
}
if len(ts) != 2 {
return EINVAL
}
atime := ts[0].Sec
mtime := ts[1].Sec
if atime == UTIME_OMIT || mtime == UTIME_OMIT {
var st Stat_t
if err := Stat(path, &st); err != nil {
return err
}
if atime == UTIME_OMIT {
atime = st.Atime
}
if mtime == UTIME_OMIT {
mtime = st.Mtime
}
}
_, err := fsCall("utimes", path, atime, mtime)
return err
}
func Rename(from, to string) error {
if err := checkPath(from); err != nil {
return err
}
if err := checkPath(to); err != nil {
return err
}
_, err := fsCall("rename", from, to)
return err
}
func Truncate(path string, length int64) error {
if err := checkPath(path); err != nil {
return err
}
_, err := fsCall("truncate", path, length)
return err
}
func Ftruncate(fd int, length int64) error {
_, err := fsCall("ftruncate", fd, length)
return err
}
func Getcwd(buf []byte) (n int, err error) {
defer recoverErr(&err)
cwd := jsProcess.Call("cwd").String()
n = copy(buf, cwd)
return
}
func Chdir(path string) (err error) {
if err := checkPath(path); err != nil {
return err
}
defer recoverErr(&err)
jsProcess.Call("chdir", path)
return
}
func Fchdir(fd int) error {
f, err := fdToFile(fd)
if err != nil {
return err
}
return Chdir(f.path)
}
func Readlink(path string, buf []byte) (n int, err error) {
if err := checkPath(path); err != nil {
return 0, err
}
dst, err := fsCall("readlink", path)
if err != nil {
return 0, err
}
n = copy(buf, dst.String())
return n, nil
}
func Link(path, link string) error {
if err := checkPath(path); err != nil {
return err
}
if err := checkPath(link); err != nil {
return err
}
_, err := fsCall("link", path, link)
return err
}
func Symlink(path, link string) error {
if err := checkPath(path); err != nil {
return err
}
if err := checkPath(link); err != nil {
return err
}
_, err := fsCall("symlink", path, link)
return err
}
func Fsync(fd int) error {
_, err := fsCall("fsync", fd)
return err
}
func Read(fd int, b []byte) (int, error) {
f, err := fdToFile(fd)
if err != nil {
return 0, err
}
if f.seeked {
n, err := Pread(fd, b, f.pos)
f.pos += int64(n)
return n, err
}
buf := uint8Array.New(len(b))
n, err := fsCall("read", fd, buf, 0, len(b), nil)
if err != nil {
return 0, err
}
js.CopyBytesToGo(b, buf)
n2 := n.Int()
f.pos += int64(n2)
return n2, err
}
func Write(fd int, b []byte) (int, error) {
f, err := fdToFile(fd)
if err != nil {
return 0, err
}
if f.seeked {
n, err := Pwrite(fd, b, f.pos)
f.pos += int64(n)
return n, err
}
if faketime && (fd == 1 || fd == 2) {
n := faketimeWrite(fd, b)
if n < 0 {
return 0, errnoErr(Errno(-n))
}
return n, nil
}
buf := uint8Array.New(len(b))
js.CopyBytesToJS(buf, b)
n, err := fsCall("write", fd, buf, 0, len(b), nil)
if err != nil {
return 0, err
}
n2 := n.Int()
f.pos += int64(n2)
return n2, err
}
func Pread(fd int, b []byte, offset int64) (int, error) {
buf := uint8Array.New(len(b))
n, err := fsCall("read", fd, buf, 0, len(b), offset)
if err != nil {
return 0, err
}
js.CopyBytesToGo(b, buf)
return n.Int(), nil
}
func Pwrite(fd int, b []byte, offset int64) (int, error) {
buf := uint8Array.New(len(b))
js.CopyBytesToJS(buf, b)
n, err := fsCall("write", fd, buf, 0, len(b), offset)
if err != nil {
return 0, err
}
return n.Int(), nil
}
func Seek(fd int, offset int64, whence int) (int64, error) {
f, err := fdToFile(fd)
if err != nil {
return 0, err
}
var newPos int64
switch whence {
case 0:
newPos = offset
case 1:
newPos = f.pos + offset
case 2:
var st Stat_t
if err := Fstat(fd, &st); err != nil {
return 0, err
}
newPos = st.Size + offset
default:
return 0, errnoErr(EINVAL)
}
if newPos < 0 {
return 0, errnoErr(EINVAL)
}
f.seeked = true
f.dirIdx = 0 // Reset directory read position. See issue 35767.
f.pos = newPos
return newPos, nil
}
func Dup(fd int) (int, error) {
return 0, ENOSYS
}
func Dup2(fd, newfd int) error {
return ENOSYS
}
func Pipe(fd []int) error {
return ENOSYS
}
func fsCall(name string, args ...any) (js.Value, error) {
type callResult struct {
val js.Value
err error
}
c := make(chan callResult, 1)
f := js.FuncOf(func(this js.Value, args []js.Value) any {
var res callResult
if len(args) >= 1 { // on Node.js 8, fs.utimes calls the callback without any arguments
if jsErr := args[0]; !jsErr.IsNull() {
res.err = mapJSError(jsErr)
}
}
res.val = js.Undefined()
if len(args) >= 2 {
res.val = args[1]
}
c <- res
return nil
})
defer f.Release()
jsFS.Call(name, append(args, f)...)
res := <-c
return res.val, res.err
}
// checkPath checks that the path is not empty and that it contains no null characters.
func checkPath(path string) error {
if path == "" {
return EINVAL
}
for i := 0; i < len(path); i++ {
if path[i] == '\x00' {
return EINVAL
}
}
return nil
}
func recoverErr(errPtr *error) {
if err := recover(); err != nil {
jsErr, ok := err.(js.Error)
if !ok {
panic(err)
}
*errPtr = mapJSError(jsErr.Value)
}
}
// mapJSError maps an error given by Node.js to the appropriate Go error.
func mapJSError(jsErr js.Value) error {
errno, ok := errnoByCode[jsErr.Get("code").String()]
if !ok {
panic(jsErr)
}
return errnoErr(Errno(errno))
}

932
src/syscall/fs_wasip1.go Normal file
View File

@@ -0,0 +1,932 @@
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build wasip1
package syscall
import (
"internal/stringslite"
"runtime"
"unsafe"
)
func init() {
// Try to set stdio to non-blocking mode before the os package
// calls NewFile for each fd. NewFile queries the non-blocking flag
// but doesn't change it, even if the runtime supports non-blocking
// stdio. Since WebAssembly modules are single-threaded, blocking
// system calls temporarily halt execution of the module. If the
// runtime supports non-blocking stdio, the Go runtime is able to
// use the WASI net poller to poll for read/write readiness and is
// able to schedule goroutines while waiting.
SetNonblock(0, true)
SetNonblock(1, true)
SetNonblock(2, true)
}
type uintptr32 = uint32
type size = uint32
type fdflags = uint32
type filesize = uint64
type filetype = uint8
type lookupflags = uint32
type oflags = uint32
type rights = uint64
type timestamp = uint64
type dircookie = uint64
type filedelta = int64
type fstflags = uint32
type iovec struct {
buf uintptr32
bufLen size
}
const (
LOOKUP_SYMLINK_FOLLOW = 0x00000001
)
const (
OFLAG_CREATE = 0x0001
OFLAG_DIRECTORY = 0x0002
OFLAG_EXCL = 0x0004
OFLAG_TRUNC = 0x0008
)
const (
FDFLAG_APPEND = 0x0001
FDFLAG_DSYNC = 0x0002
FDFLAG_NONBLOCK = 0x0004
FDFLAG_RSYNC = 0x0008
FDFLAG_SYNC = 0x0010
)
const (
RIGHT_FD_DATASYNC = 1 << iota
RIGHT_FD_READ
RIGHT_FD_SEEK
RIGHT_FDSTAT_SET_FLAGS
RIGHT_FD_SYNC
RIGHT_FD_TELL
RIGHT_FD_WRITE
RIGHT_FD_ADVISE
RIGHT_FD_ALLOCATE
RIGHT_PATH_CREATE_DIRECTORY
RIGHT_PATH_CREATE_FILE
RIGHT_PATH_LINK_SOURCE
RIGHT_PATH_LINK_TARGET
RIGHT_PATH_OPEN
RIGHT_FD_READDIR
RIGHT_PATH_READLINK
RIGHT_PATH_RENAME_SOURCE
RIGHT_PATH_RENAME_TARGET
RIGHT_PATH_FILESTAT_GET
RIGHT_PATH_FILESTAT_SET_SIZE
RIGHT_PATH_FILESTAT_SET_TIMES
RIGHT_FD_FILESTAT_GET
RIGHT_FD_FILESTAT_SET_SIZE
RIGHT_FD_FILESTAT_SET_TIMES
RIGHT_PATH_SYMLINK
RIGHT_PATH_REMOVE_DIRECTORY
RIGHT_PATH_UNLINK_FILE
RIGHT_POLL_FD_READWRITE
RIGHT_SOCK_SHUTDOWN
RIGHT_SOCK_ACCEPT
)
const (
WHENCE_SET = 0
WHENCE_CUR = 1
WHENCE_END = 2
)
const (
FILESTAT_SET_ATIM = 0x0001
FILESTAT_SET_ATIM_NOW = 0x0002
FILESTAT_SET_MTIM = 0x0004
FILESTAT_SET_MTIM_NOW = 0x0008
)
const (
// Despite the rights being defined as a 64 bits integer in the spec,
// wasmtime crashes the program if we set any of the upper 32 bits.
fullRights = rights(^uint32(0))
readRights = rights(RIGHT_FD_READ | RIGHT_FD_READDIR)
writeRights = rights(RIGHT_FD_DATASYNC | RIGHT_FD_WRITE | RIGHT_FD_ALLOCATE | RIGHT_PATH_FILESTAT_SET_SIZE)
// Some runtimes have very strict expectations when it comes to which
// rights can be enabled on files opened by path_open. The fileRights
// constant is used as a mask to retain only bits for operations that
// are supported on files.
fileRights rights = RIGHT_FD_DATASYNC |
RIGHT_FD_READ |
RIGHT_FD_SEEK |
RIGHT_FDSTAT_SET_FLAGS |
RIGHT_FD_SYNC |
RIGHT_FD_TELL |
RIGHT_FD_WRITE |
RIGHT_FD_ADVISE |
RIGHT_FD_ALLOCATE |
RIGHT_PATH_CREATE_DIRECTORY |
RIGHT_PATH_CREATE_FILE |
RIGHT_PATH_LINK_SOURCE |
RIGHT_PATH_LINK_TARGET |
RIGHT_PATH_OPEN |
RIGHT_FD_READDIR |
RIGHT_PATH_READLINK |
RIGHT_PATH_RENAME_SOURCE |
RIGHT_PATH_RENAME_TARGET |
RIGHT_PATH_FILESTAT_GET |
RIGHT_PATH_FILESTAT_SET_SIZE |
RIGHT_PATH_FILESTAT_SET_TIMES |
RIGHT_FD_FILESTAT_GET |
RIGHT_FD_FILESTAT_SET_SIZE |
RIGHT_FD_FILESTAT_SET_TIMES |
RIGHT_PATH_SYMLINK |
RIGHT_PATH_REMOVE_DIRECTORY |
RIGHT_PATH_UNLINK_FILE |
RIGHT_POLL_FD_READWRITE
// Runtimes like wasmtime and wasmedge will refuse to open directories
// if the rights requested by the application exceed the operations that
// can be performed on a directory.
dirRights rights = RIGHT_FD_SEEK |
RIGHT_FDSTAT_SET_FLAGS |
RIGHT_FD_SYNC |
RIGHT_PATH_CREATE_DIRECTORY |
RIGHT_PATH_CREATE_FILE |
RIGHT_PATH_LINK_SOURCE |
RIGHT_PATH_LINK_TARGET |
RIGHT_PATH_OPEN |
RIGHT_FD_READDIR |
RIGHT_PATH_READLINK |
RIGHT_PATH_RENAME_SOURCE |
RIGHT_PATH_RENAME_TARGET |
RIGHT_PATH_FILESTAT_GET |
RIGHT_PATH_FILESTAT_SET_SIZE |
RIGHT_PATH_FILESTAT_SET_TIMES |
RIGHT_FD_FILESTAT_GET |
RIGHT_FD_FILESTAT_SET_TIMES |
RIGHT_PATH_SYMLINK |
RIGHT_PATH_REMOVE_DIRECTORY |
RIGHT_PATH_UNLINK_FILE
)
// https://github.com/WebAssembly/WASI/blob/a2b96e81c0586125cc4dc79a5be0b78d9a059925/legacy/preview1/docs.md#-fd_closefd-fd---result-errno
//
//go:wasmimport wasi_snapshot_preview1 fd_close
//go:noescape
func fd_close(fd int32) Errno
// https://github.com/WebAssembly/WASI/blob/a2b96e81c0586125cc4dc79a5be0b78d9a059925/legacy/preview1/docs.md#-fd_filestat_set_sizefd-fd-size-filesize---result-errno
//
//go:wasmimport wasi_snapshot_preview1 fd_filestat_set_size
//go:noescape
func fd_filestat_set_size(fd int32, set_size filesize) Errno
// https://github.com/WebAssembly/WASI/blob/a2b96e81c0586125cc4dc79a5be0b78d9a059925/legacy/preview1/docs.md#-fd_preadfd-fd-iovs-iovec_array-offset-filesize---resultsize-errno
//
//go:wasmimport wasi_snapshot_preview1 fd_pread
//go:noescape
func fd_pread(fd int32, iovs unsafe.Pointer, iovsLen size, offset filesize, nread unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_pwrite
//go:noescape
func fd_pwrite(fd int32, iovs unsafe.Pointer, iovsLen size, offset filesize, nwritten unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_read
//go:noescape
func fd_read(fd int32, iovs unsafe.Pointer, iovsLen size, nread unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_readdir
//go:noescape
func fd_readdir(fd int32, buf unsafe.Pointer, bufLen size, cookie dircookie, nwritten unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_seek
//go:noescape
func fd_seek(fd int32, offset filedelta, whence uint32, newoffset unsafe.Pointer) Errno
// https://github.com/WebAssembly/WASI/blob/a2b96e81c0586125cc4dc79a5be0b78d9a059925/legacy/preview1/docs.md#-fd_fdstat_set_rightsfd-fd-fs_rights_base-rights-fs_rights_inheriting-rights---result-errno
//
//go:wasmimport wasi_snapshot_preview1 fd_fdstat_set_rights
//go:noescape
func fd_fdstat_set_rights(fd int32, rightsBase rights, rightsInheriting rights) Errno
//go:wasmimport wasi_snapshot_preview1 fd_filestat_get
//go:noescape
func fd_filestat_get(fd int32, buf unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_write
//go:noescape
func fd_write(fd int32, iovs unsafe.Pointer, iovsLen size, nwritten unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_sync
//go:noescape
func fd_sync(fd int32) Errno
//go:wasmimport wasi_snapshot_preview1 path_create_directory
//go:noescape
func path_create_directory(fd int32, path unsafe.Pointer, pathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_filestat_get
//go:noescape
func path_filestat_get(fd int32, flags lookupflags, path unsafe.Pointer, pathLen size, buf unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 path_filestat_set_times
//go:noescape
func path_filestat_set_times(fd int32, flags lookupflags, path unsafe.Pointer, pathLen size, atim timestamp, mtim timestamp, fstflags fstflags) Errno
//go:wasmimport wasi_snapshot_preview1 path_link
//go:noescape
func path_link(oldFd int32, oldFlags lookupflags, oldPath unsafe.Pointer, oldPathLen size, newFd int32, newPath unsafe.Pointer, newPathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_readlink
//go:noescape
func path_readlink(fd int32, path unsafe.Pointer, pathLen size, buf unsafe.Pointer, bufLen size, nwritten unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 path_remove_directory
//go:noescape
func path_remove_directory(fd int32, path unsafe.Pointer, pathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_rename
//go:noescape
func path_rename(oldFd int32, oldPath unsafe.Pointer, oldPathLen size, newFd int32, newPath unsafe.Pointer, newPathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_symlink
//go:noescape
func path_symlink(oldPath unsafe.Pointer, oldPathLen size, fd int32, newPath unsafe.Pointer, newPathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_unlink_file
//go:noescape
func path_unlink_file(fd int32, path unsafe.Pointer, pathLen size) Errno
//go:wasmimport wasi_snapshot_preview1 path_open
//go:noescape
func path_open(rootFD int32, dirflags lookupflags, path unsafe.Pointer, pathLen size, oflags oflags, fsRightsBase rights, fsRightsInheriting rights, fsFlags fdflags, fd unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 random_get
//go:noescape
func random_get(buf unsafe.Pointer, bufLen size) Errno
// https://github.com/WebAssembly/WASI/blob/a2b96e81c0586125cc4dc79a5be0b78d9a059925/legacy/preview1/docs.md#-fdstat-record
// fdflags must be at offset 2, hence the uint16 type rather than the
// fdflags (uint32) type.
type fdstat struct {
filetype filetype
fdflags uint16
rightsBase rights
rightsInheriting rights
}
//go:wasmimport wasi_snapshot_preview1 fd_fdstat_get
//go:noescape
func fd_fdstat_get(fd int32, buf unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_fdstat_set_flags
//go:noescape
func fd_fdstat_set_flags(fd int32, flags fdflags) Errno
// fd_fdstat_get_flags is accessed from internal/syscall/unix
//go:linkname fd_fdstat_get_flags
func fd_fdstat_get_flags(fd int) (uint32, error) {
var stat fdstat
errno := fd_fdstat_get(int32(fd), unsafe.Pointer(&stat))
return uint32(stat.fdflags), errnoErr(errno)
}
// fd_fdstat_get_type is accessed from net
//go:linkname fd_fdstat_get_type
func fd_fdstat_get_type(fd int) (uint8, error) {
var stat fdstat
errno := fd_fdstat_get(int32(fd), unsafe.Pointer(&stat))
return stat.filetype, errnoErr(errno)
}
type preopentype = uint8
const (
preopentypeDir preopentype = iota
)
type prestatDir struct {
prNameLen size
}
type prestat struct {
typ preopentype
dir prestatDir
}
//go:wasmimport wasi_snapshot_preview1 fd_prestat_get
//go:noescape
func fd_prestat_get(fd int32, prestat unsafe.Pointer) Errno
//go:wasmimport wasi_snapshot_preview1 fd_prestat_dir_name
//go:noescape
func fd_prestat_dir_name(fd int32, path unsafe.Pointer, pathLen size) Errno
type opendir struct {
fd int32
name string
}
// List of preopen directories that were exposed by the runtime. The first one
// is assumed to the be root directory of the file system, and others are seen
// as mount points at sub paths of the root.
var preopens []opendir
// Current working directory. We maintain this as a string and resolve paths in
// the code because wasmtime does not allow relative path lookups outside of the
// scope of a directory; a previous approach we tried consisted in maintaining
// open a file descriptor to the current directory so we could perform relative
// path lookups from that location, but it resulted in breaking path resolution
// from the current directory to its parent.
var cwd string
func init() {
dirNameBuf := make([]byte, 256)
// We start looking for preopens at fd=3 because 0, 1, and 2 are reserved
// for standard input and outputs.
for preopenFd := int32(3); ; preopenFd++ {
var prestat prestat
errno := fd_prestat_get(preopenFd, unsafe.Pointer(&prestat))
if errno == EBADF {
break
}
if errno == ENOTDIR || prestat.typ != preopentypeDir {
continue
}
if errno != 0 {
panic("fd_prestat: " + errno.Error())
}
if int(prestat.dir.prNameLen) > len(dirNameBuf) {
dirNameBuf = make([]byte, prestat.dir.prNameLen)
}
errno = fd_prestat_dir_name(preopenFd, unsafe.Pointer(&dirNameBuf[0]), prestat.dir.prNameLen)
if errno != 0 {
panic("fd_prestat_dir_name: " + errno.Error())
}
preopens = append(preopens, opendir{
fd: preopenFd,
name: string(dirNameBuf[:prestat.dir.prNameLen]),
})
}
if cwd, _ = Getenv("PWD"); cwd != "" {
cwd = joinPath("/", cwd)
} else if len(preopens) > 0 {
cwd = preopens[0].name
}
}
// Provided by package runtime.
func now() (sec int64, nsec int32)
//go:nosplit
func appendCleanPath(buf []byte, path string, lookupParent bool) ([]byte, bool) {
i := 0
for i < len(path) {
for i < len(path) && path[i] == '/' {
i++
}
j := i
for j < len(path) && path[j] != '/' {
j++
}
s := path[i:j]
i = j
switch s {
case "":
continue
case ".":
continue
case "..":
if !lookupParent {
k := len(buf)
for k > 0 && buf[k-1] != '/' {
k--
}
for k > 1 && buf[k-1] == '/' {
k--
}
buf = buf[:k]
if k == 0 {
lookupParent = true
} else {
s = ""
continue
}
}
default:
lookupParent = false
}
if len(buf) > 0 && buf[len(buf)-1] != '/' {
buf = append(buf, '/')
}
buf = append(buf, s...)
}
return buf, lookupParent
}
// joinPath concatenates dir and file paths, producing a cleaned path where
// "." and ".." have been removed, unless dir is relative and the references
// to parent directories in file represented a location relative to a parent
// of dir.
//
// This function is used for path resolution of all wasi functions expecting
// a path argument; the returned string is heap allocated, which we may want
// to optimize in the future. Instead of returning a string, the function
// could append the result to an output buffer that the functions in this
// file can manage to have allocated on the stack (e.g. initializing to a
// fixed capacity). Since it will significantly increase code complexity,
// we prefer to optimize for readability and maintainability at this time.
func joinPath(dir, file string) string {
buf := make([]byte, 0, len(dir)+len(file)+1)
if isAbs(dir) {
buf = append(buf, '/')
}
buf, lookupParent := appendCleanPath(buf, dir, false)
buf, _ = appendCleanPath(buf, file, lookupParent)
// The appendCleanPath function cleans the path so it does not inject
// references to the current directory. If both the dir and file args
// were ".", this results in the output buffer being empty so we handle
// this condition here.
if len(buf) == 0 {
buf = append(buf, '.')
}
// If the file ended with a '/' we make sure that the output also ends
// with a '/'. This is needed to ensure that programs have a mechanism
// to represent dereferencing symbolic links pointing to directories.
if buf[len(buf)-1] != '/' && isDir(file) {
buf = append(buf, '/')
}
return unsafe.String(&buf[0], len(buf))
}
func isAbs(path string) bool {
return stringslite.HasPrefix(path, "/")
}
func isDir(path string) bool {
return stringslite.HasSuffix(path, "/")
}
// preparePath returns the preopen file descriptor of the directory to perform
// path resolution from, along with the pair of pointer and length for the
// relative expression of path from the directory.
//
// If the path argument is not absolute, it is first appended to the current
// working directory before resolution.
func preparePath(path string) (int32, unsafe.Pointer, size) {
var dirFd = int32(-1)
var dirName string
dir := "/"
if !isAbs(path) {
dir = cwd
}
path = joinPath(dir, path)
for _, p := range preopens {
if len(p.name) > len(dirName) && stringslite.HasPrefix(path, p.name) {
dirFd, dirName = p.fd, p.name
}
}
path = path[len(dirName):]
for isAbs(path) {
path = path[1:]
}
if len(path) == 0 {
path = "."
}
return dirFd, stringPointer(path), size(len(path))
}
func Open(path string, openmode int, perm uint32) (int, error) {
if path == "" {
return -1, EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
var oflags oflags
if (openmode & O_CREATE) != 0 {
oflags |= OFLAG_CREATE
}
if (openmode & O_TRUNC) != 0 {
oflags |= OFLAG_TRUNC
}
if (openmode & O_EXCL) != 0 {
oflags |= OFLAG_EXCL
}
var rights rights
switch openmode & (O_RDONLY | O_WRONLY | O_RDWR) {
case O_RDONLY:
rights = fileRights & ^writeRights
case O_WRONLY:
rights = fileRights & ^readRights
case O_RDWR:
rights = fileRights
}
var fdflags fdflags
if (openmode & O_APPEND) != 0 {
fdflags |= FDFLAG_APPEND
}
if (openmode & O_SYNC) != 0 {
fdflags |= FDFLAG_SYNC
}
var fd int32
errno := path_open(
dirFd,
LOOKUP_SYMLINK_FOLLOW,
pathPtr,
pathLen,
oflags,
rights,
fileRights,
fdflags,
unsafe.Pointer(&fd),
)
if errno == EISDIR && oflags == 0 && fdflags == 0 && ((rights & writeRights) == 0) {
// wasmtime and wasmedge will error if attempting to open a directory
// because we are asking for too many rights. However, we cannot
// determine ahead of time if the path we are about to open is a
// directory, so instead we fallback to a second call to path_open with
// a more limited set of rights.
//
// This approach is subject to a race if the file system is modified
// concurrently, so we also inject OFLAG_DIRECTORY to ensure that we do
// not accidentally open a file which is not a directory.
errno = path_open(
dirFd,
LOOKUP_SYMLINK_FOLLOW,
pathPtr,
pathLen,
oflags|OFLAG_DIRECTORY,
rights&dirRights,
fileRights,
fdflags,
unsafe.Pointer(&fd),
)
}
return int(fd), errnoErr(errno)
}
func Close(fd int) error {
errno := fd_close(int32(fd))
return errnoErr(errno)
}
func CloseOnExec(fd int) {
// nothing to do - no exec
}
func Mkdir(path string, perm uint32) error {
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_create_directory(dirFd, pathPtr, pathLen)
return errnoErr(errno)
}
func ReadDir(fd int, buf []byte, cookie dircookie) (int, error) {
var nwritten size
errno := fd_readdir(int32(fd), unsafe.Pointer(&buf[0]), size(len(buf)), cookie, unsafe.Pointer(&nwritten))
return int(nwritten), errnoErr(errno)
}
type Stat_t struct {
Dev uint64
Ino uint64
Filetype uint8
Nlink uint64
Size uint64
Atime uint64
Mtime uint64
Ctime uint64
Mode int
// Uid and Gid are always zero on wasip1 platforms
Uid uint32
Gid uint32
}
func Stat(path string, st *Stat_t) error {
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_filestat_get(dirFd, LOOKUP_SYMLINK_FOLLOW, pathPtr, pathLen, unsafe.Pointer(st))
setDefaultMode(st)
return errnoErr(errno)
}
func Lstat(path string, st *Stat_t) error {
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_filestat_get(dirFd, 0, pathPtr, pathLen, unsafe.Pointer(st))
setDefaultMode(st)
return errnoErr(errno)
}
func Fstat(fd int, st *Stat_t) error {
errno := fd_filestat_get(int32(fd), unsafe.Pointer(st))
setDefaultMode(st)
return errnoErr(errno)
}
func setDefaultMode(st *Stat_t) {
// WASI does not support unix-like permissions, but Go programs are likely
// to expect the permission bits to not be zero so we set defaults to help
// avoid breaking applications that are migrating to WASM.
if st.Filetype == FILETYPE_DIRECTORY {
st.Mode = 0700
} else {
st.Mode = 0600
}
}
func Unlink(path string) error {
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_unlink_file(dirFd, pathPtr, pathLen)
return errnoErr(errno)
}
func Rmdir(path string) error {
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_remove_directory(dirFd, pathPtr, pathLen)
return errnoErr(errno)
}
func Chmod(path string, mode uint32) error {
var stat Stat_t
return Stat(path, &stat)
}
func Fchmod(fd int, mode uint32) error {
var stat Stat_t
return Fstat(fd, &stat)
}
func Chown(path string, uid, gid int) error {
return ENOSYS
}
func Fchown(fd int, uid, gid int) error {
return ENOSYS
}
func Lchown(path string, uid, gid int) error {
return ENOSYS
}
func UtimesNano(path string, ts []Timespec) error {
// UTIME_OMIT value must match internal/syscall/unix/at_wasip1.go
const UTIME_OMIT = -0x2
if path == "" {
return EINVAL
}
dirFd, pathPtr, pathLen := preparePath(path)
atime := TimespecToNsec(ts[0])
mtime := TimespecToNsec(ts[1])
if ts[0].Nsec == UTIME_OMIT || ts[1].Nsec == UTIME_OMIT {
var st Stat_t
if err := Stat(path, &st); err != nil {
return err
}
if ts[0].Nsec == UTIME_OMIT {
atime = int64(st.Atime)
}
if ts[1].Nsec == UTIME_OMIT {
mtime = int64(st.Mtime)
}
}
errno := path_filestat_set_times(
dirFd,
LOOKUP_SYMLINK_FOLLOW,
pathPtr,
pathLen,
timestamp(atime),
timestamp(mtime),
FILESTAT_SET_ATIM|FILESTAT_SET_MTIM,
)
return errnoErr(errno)
}
func Rename(from, to string) error {
if from == "" || to == "" {
return EINVAL
}
oldDirFd, oldPathPtr, oldPathLen := preparePath(from)
newDirFd, newPathPtr, newPathLen := preparePath(to)
errno := path_rename(
oldDirFd,
oldPathPtr,
oldPathLen,
newDirFd,
newPathPtr,
newPathLen,
)
return errnoErr(errno)
}
func Truncate(path string, length int64) error {
if path == "" {
return EINVAL
}
fd, err := Open(path, O_WRONLY, 0)
if err != nil {
return err
}
defer Close(fd)
return Ftruncate(fd, length)
}
func Ftruncate(fd int, length int64) error {
errno := fd_filestat_set_size(int32(fd), filesize(length))
return errnoErr(errno)
}
const ImplementsGetwd = true
func Getwd() (string, error) {
return cwd, nil
}
func Chdir(path string) error {
if path == "" {
return EINVAL
}
dir := "/"
if !isAbs(path) {
dir = cwd
}
path = joinPath(dir, path)
var stat Stat_t
dirFd, pathPtr, pathLen := preparePath(path)
errno := path_filestat_get(dirFd, LOOKUP_SYMLINK_FOLLOW, pathPtr, pathLen, unsafe.Pointer(&stat))
if errno != 0 {
return errnoErr(errno)
}
if stat.Filetype != FILETYPE_DIRECTORY {
return ENOTDIR
}
cwd = path
return nil
}
func Readlink(path string, buf []byte) (n int, err error) {
if path == "" {
return 0, EINVAL
}
if len(buf) == 0 {
return 0, nil
}
dirFd, pathPtr, pathLen := preparePath(path)
var nwritten size
errno := path_readlink(
dirFd,
pathPtr,
pathLen,
unsafe.Pointer(&buf[0]),
size(len(buf)),
unsafe.Pointer(&nwritten),
)
// For some reason wasmtime returns ERANGE when the output buffer is
// shorter than the symbolic link value. os.Readlink expects a nil
// error and uses the fact that n is greater or equal to the buffer
// length to assume that it needs to try again with a larger size.
// This condition is handled in os.Readlink.
return int(nwritten), errnoErr(errno)
}
func Link(path, link string) error {
if path == "" || link == "" {
return EINVAL
}
oldDirFd, oldPathPtr, oldPathLen := preparePath(path)
newDirFd, newPathPtr, newPathLen := preparePath(link)
errno := path_link(
oldDirFd,
0,
oldPathPtr,
oldPathLen,
newDirFd,
newPathPtr,
newPathLen,
)
return errnoErr(errno)
}
func Symlink(path, link string) error {
if path == "" || link == "" {
return EINVAL
}
dirFd, pathPtr, pathlen := preparePath(link)
errno := path_symlink(
stringPointer(path),
size(len(path)),
dirFd,
pathPtr,
pathlen,
)
return errnoErr(errno)
}
func Fsync(fd int) error {
errno := fd_sync(int32(fd))
return errnoErr(errno)
}
func bytesPointer(b []byte) unsafe.Pointer {
return unsafe.Pointer(unsafe.SliceData(b))
}
func stringPointer(s string) unsafe.Pointer {
return unsafe.Pointer(unsafe.StringData(s))
}
func makeIOVec(b []byte) unsafe.Pointer {
return unsafe.Pointer(&iovec{
buf: uintptr32(uintptr(bytesPointer(b))),
bufLen: size(len(b)),
})
}
func Read(fd int, b []byte) (int, error) {
var nread size
errno := fd_read(int32(fd), makeIOVec(b), 1, unsafe.Pointer(&nread))
runtime.KeepAlive(b)
return int(nread), errnoErr(errno)
}
func Write(fd int, b []byte) (int, error) {
var nwritten size
errno := fd_write(int32(fd), makeIOVec(b), 1, unsafe.Pointer(&nwritten))
runtime.KeepAlive(b)
return int(nwritten), errnoErr(errno)
}
func Pread(fd int, b []byte, offset int64) (int, error) {
var nread size
errno := fd_pread(int32(fd), makeIOVec(b), 1, filesize(offset), unsafe.Pointer(&nread))
runtime.KeepAlive(b)
return int(nread), errnoErr(errno)
}
func Pwrite(fd int, b []byte, offset int64) (int, error) {
var nwritten size
errno := fd_pwrite(int32(fd), makeIOVec(b), 1, filesize(offset), unsafe.Pointer(&nwritten))
runtime.KeepAlive(b)
return int(nwritten), errnoErr(errno)
}
func Seek(fd int, offset int64, whence int) (int64, error) {
var newoffset filesize
errno := fd_seek(int32(fd), filedelta(offset), uint32(whence), unsafe.Pointer(&newoffset))
return int64(newoffset), errnoErr(errno)
}
func Dup(fd int) (int, error) {
return 0, ENOSYS
}
func Dup2(fd, newfd int) error {
return ENOSYS
}
func Pipe(fd []int) error {
return ENOSYS
}
func RandomGet(b []byte) error {
errno := random_get(bytesPointer(b), size(len(b)))
return errnoErr(errno)
}

76
src/syscall/fs_wasip1_test.go Normal file
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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build wasip1
package syscall_test
import (
"syscall"
"testing"
)
var joinPathTests = [...]struct {
dir, file, path string
}{
0: {".", ".", "."},
1: {"./", "./", "./"},
2: {"././././", ".", "."},
3: {".", "./././", "./"},
4: {".", "a", "a"},
5: {".", "a/b", "a/b"},
6: {".", "..", ".."},
7: {".", "../", "../"},
8: {".", "../../", "../../"},
9: {".", "../..", "../.."},
10: {".", "../..//..///", "../../../"},
11: {"/", "/", "/"},
12: {"/", "a", "/a"},
13: {"/", "a/b", "/a/b"},
14: {"/a", "b", "/a/b"},
15: {"/", ".", "/"},
16: {"/", "..", "/"},
17: {"/", "../../", "/"},
18: {"/", "/../a/b/c", "/a/b/c"},
19: {"/", "/../a/b/c", "/a/b/c"},
20: {"/", "./hello/world", "/hello/world"},
21: {"/a", "../", "/"},
22: {"/a/b/c", "..", "/a/b"},
23: {"/a/b/c", "..///..///", "/a/"},
24: {"/a/b/c", "..///..///..", "/"},
25: {"/a/b/c", "..///..///..///..", "/"},
26: {"/a/b/c", "..///..///..///..///..", "/"},
27: {"/a/b/c/", "/d/e/f/", "/a/b/c/d/e/f/"},
28: {"a/b/c/", ".", "a/b/c"},
29: {"a/b/c/", "./d", "a/b/c/d"},
30: {"a/b/c/", "./d/", "a/b/c/d/"},
31: {"a/b/", "./c/d/", "a/b/c/d/"},
32: {"../", "..", "../.."},
33: {"a/b/c/d", "e/../..", "a/b/c"},
34: {"a/b/c/d", "./e/../..", "a/b/c"},
35: {"a/b/c/d", "./e/..//../../f/g//", "a/b/f/g/"},
36: {"../../../", "a/../../b/c", "../../b/c"},
37: {"/a/b/c", "/.././/hey!", "/a/b/hey!"},
}
func TestJoinPath(t *testing.T) {
for _, test := range joinPathTests {
t.Run("", func(t *testing.T) {
path := syscall.JoinPath(test.dir, test.file)
if path != test.path {
t.Errorf("join(%q,%q): want=%q got=%q", test.dir, test.file, test.path, path)
}
})
}
}
func BenchmarkJoinPath(b *testing.B) {
for _, test := range joinPathTests {
b.Run("", func(b *testing.B) {
for i := 0; i < b.N; i++ {
syscall.JoinPath(test.dir, test.file)
}
})
}
}

84
src/syscall/getdirentries_test.go Normal file
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || freebsd || netbsd || openbsd
package syscall_test
import (
"fmt"
"os"
"path/filepath"
"slices"
"strings"
"syscall"
"testing"
"unsafe"
)
func TestGetdirentries(t *testing.T) {
for _, count := range []int{10, 1000} {
t.Run(fmt.Sprintf("n=%d", count), func(t *testing.T) {
testGetdirentries(t, count)
})
}
}
func testGetdirentries(t *testing.T, count int) {
if count > 100 && testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
t.Skip("skipping in -short mode")
}
d := t.TempDir()
var names []string
for i := 0; i < count; i++ {
names = append(names, fmt.Sprintf("file%03d", i))
}
// Make files in the temp directory
for _, name := range names {
err := os.WriteFile(filepath.Join(d, name), []byte("data"), 0)
if err != nil {
t.Fatalf("WriteFile: %v", err)
}
}
// Read files using Getdirentries
var names2 []string
fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
if err != nil {
t.Fatalf("Open: %v", err)
}
defer syscall.Close(fd)
var base uintptr
var buf [2048]byte
for {
n, err := syscall.Getdirentries(fd, buf[:], &base)
if err != nil {
t.Fatalf("Getdirentries: %v", err)
}
if n == 0 {
break
}
data := buf[:n]
for len(data) > 0 {
// If multiple Dirents are written into buf, sometimes when we reach the final one,
// we have cap(buf) < Sizeof(Dirent). So use an appropriate slice to copy from data.
var dirent syscall.Dirent
copy((*[unsafe.Sizeof(dirent)]byte)(unsafe.Pointer(&dirent))[:], data)
data = data[dirent.Reclen:]
name := make([]byte, dirent.Namlen)
for i := 0; i < int(dirent.Namlen); i++ {
name[i] = byte(dirent.Name[i])
}
names2 = append(names2, string(name))
}
}
names = append(names, ".", "..") // Getdirentries returns these also
slices.Sort(names)
slices.Sort(names2)
if strings.Join(names, ":") != strings.Join(names2, ":") {
t.Errorf("names don't match\n names: %q\nnames2: %q", names, names2)
}
}

9
src/syscall/js/export_test.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js && wasm
package js
var JSGo = jsGo

105
src/syscall/js/func.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js && wasm
package js
import "sync"
var (
funcsMu sync.Mutex
funcs = make(map[uint32]func(Value, []Value) any)
nextFuncID uint32 = 1
)
// Func is a wrapped Go function to be called by JavaScript.
type Func struct {
Value // the JavaScript function that invokes the Go function
id uint32
}
// FuncOf returns a function to be used by JavaScript.
//
// The Go function fn is called with the value of JavaScript's "this" keyword and the
// arguments of the invocation. The return value of the invocation is
// the result of the Go function mapped back to JavaScript according to ValueOf.
//
// Invoking the wrapped Go function from JavaScript will
// pause the event loop and spawn a new goroutine.
// Other wrapped functions which are triggered during a call from Go to JavaScript
// get executed on the same goroutine.
//
// As a consequence, if one wrapped function blocks, JavaScript's event loop
// is blocked until that function returns. Hence, calling any async JavaScript
// API, which requires the event loop, like fetch (http.Client), will cause an
// immediate deadlock. Therefore a blocking function should explicitly start a
// new goroutine.
//
// Func.Release must be called to free up resources when the function will not be invoked any more.
func FuncOf(fn func(this Value, args []Value) any) Func {
funcsMu.Lock()
id := nextFuncID
nextFuncID++
funcs[id] = fn
funcsMu.Unlock()
return Func{
id: id,
Value: jsGo.Call("_makeFuncWrapper", id),
}
}
// Release frees up resources allocated for the function.
// The function must not be invoked after calling Release.
// It is allowed to call Release while the function is still running.
func (c Func) Release() {
funcsMu.Lock()
delete(funcs, c.id)
funcsMu.Unlock()
}
// setEventHandler is defined in the runtime package.
func setEventHandler(fn func() bool)
func init() {
setEventHandler(handleEvent)
}
// handleEvent retrieves the pending event (window._pendingEvent) and calls the js.Func on it.
// It returns true if an event was handled.
func handleEvent() bool {
// Retrieve the event from js
cb := jsGo.Get("_pendingEvent")
if cb.IsNull() {
return false
}
jsGo.Set("_pendingEvent", Null())
id := uint32(cb.Get("id").Int())
if id == 0 { // zero indicates deadlock
select {}
}
// Retrieve the associated js.Func
funcsMu.Lock()
f, ok := funcs[id]
funcsMu.Unlock()
if !ok {
Global().Get("console").Call("error", "call to released function")
return true
}
// Call the js.Func with arguments
this := cb.Get("this")
argsObj := cb.Get("args")
args := make([]Value, argsObj.Length())
for i := range args {
args[i] = argsObj.Index(i)
}
result := f(this, args)
// Return the result to js
cb.Set("result", result)
return true
}

687
src/syscall/js/js.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js && wasm
// Package js gives access to the WebAssembly host environment when using the js/wasm architecture.
// Its API is based on JavaScript semantics.
//
// This package is EXPERIMENTAL. Its current scope is only to allow tests to run, but not yet to provide a
// comprehensive API for users. It is exempt from the Go compatibility promise.
package js
import (
"runtime"
"unsafe"
)
// ref is used to identify a JavaScript value, since the value itself can not be passed to WebAssembly.
//
// The JavaScript value "undefined" is represented by the value 0.
// A JavaScript number (64-bit float, except 0 and NaN) is represented by its IEEE 754 binary representation.
// All other values are represented as an IEEE 754 binary representation of NaN with bits 0-31 used as
// an ID and bits 32-34 used to differentiate between string, symbol, function and object.
type ref uint64
// nanHead are the upper 32 bits of a ref which are set if the value is not encoded as an IEEE 754 number (see above).
const nanHead = 0x7FF80000
// Value represents a JavaScript value. The zero value is the JavaScript value "undefined".
// Values can be checked for equality with the Equal method.
type Value struct {
_ [0]func() // uncomparable; to make == not compile
ref ref // identifies a JavaScript value, see ref type
gcPtr *ref // used to trigger the finalizer when the Value is not referenced any more
}
const (
// the type flags need to be in sync with wasm_exec.js
typeFlagNone = iota
typeFlagObject
typeFlagString
typeFlagSymbol
typeFlagFunction
)
func makeValue(r ref) Value {
var gcPtr *ref
typeFlag := (r >> 32) & 7
if (r>>32)&nanHead == nanHead && typeFlag != typeFlagNone {
gcPtr = new(ref)
*gcPtr = r
runtime.SetFinalizer(gcPtr, func(p *ref) {
finalizeRef(*p)
})
}
return Value{ref: r, gcPtr: gcPtr}
}
//go:wasmimport gojs syscall/js.finalizeRef
func finalizeRef(r ref)
func predefValue(id uint32, typeFlag byte) Value {
return Value{ref: (nanHead|ref(typeFlag))<<32 | ref(id)}
}
func floatValue(f float64) Value {
if f == 0 {
return valueZero
}
if f != f {
return valueNaN
}
return Value{ref: *(*ref)(unsafe.Pointer(&f))}
}
// Error wraps a JavaScript error.
type Error struct {
// Value is the underlying JavaScript error value.
Value
}
// Error implements the error interface.
func (e Error) Error() string {
return "JavaScript error: " + e.Get("message").String()
}
var (
valueUndefined = Value{ref: 0}
valueNaN = predefValue(0, typeFlagNone)
valueZero = predefValue(1, typeFlagNone)
valueNull = predefValue(2, typeFlagNone)
valueTrue = predefValue(3, typeFlagNone)
valueFalse = predefValue(4, typeFlagNone)
valueGlobal = predefValue(5, typeFlagObject)
jsGo = predefValue(6, typeFlagObject) // instance of the Go class in JavaScript
objectConstructor = valueGlobal.Get("Object")
arrayConstructor = valueGlobal.Get("Array")
)
// Equal reports whether v and w are equal according to JavaScript's === operator.
func (v Value) Equal(w Value) bool {
return v.ref == w.ref && v.ref != valueNaN.ref
}
// Undefined returns the JavaScript value "undefined".
func Undefined() Value {
return valueUndefined
}
// IsUndefined reports whether v is the JavaScript value "undefined".
func (v Value) IsUndefined() bool {
return v.ref == valueUndefined.ref
}
// Null returns the JavaScript value "null".
func Null() Value {
return valueNull
}
// IsNull reports whether v is the JavaScript value "null".
func (v Value) IsNull() bool {
return v.ref == valueNull.ref
}
// IsNaN reports whether v is the JavaScript value "NaN".
func (v Value) IsNaN() bool {
return v.ref == valueNaN.ref
}
// Global returns the JavaScript global object, usually "window" or "global".
func Global() Value {
return valueGlobal
}
// ValueOf returns x as a JavaScript value:
//
// | Go | JavaScript |
// | ---------------------- | ---------------------- |
// | js.Value | [its value] |
// | js.Func | function |
// | nil | null |
// | bool | boolean |
// | integers and floats | number |
// | string | string |
// | []interface{} | new array |
// | map[string]interface{} | new object |
//
// Panics if x is not one of the expected types.
func ValueOf(x any) Value {
switch x := x.(type) {
case Value:
return x
case Func:
return x.Value
case nil:
return valueNull
case bool:
if x {
return valueTrue
} else {
return valueFalse
}
case int:
return floatValue(float64(x))
case int8:
return floatValue(float64(x))
case int16:
return floatValue(float64(x))
case int32:
return floatValue(float64(x))
case int64:
return floatValue(float64(x))
case uint:
return floatValue(float64(x))
case uint8:
return floatValue(float64(x))
case uint16:
return floatValue(float64(x))
case uint32:
return floatValue(float64(x))
case uint64:
return floatValue(float64(x))
case uintptr:
return floatValue(float64(x))
case unsafe.Pointer:
return floatValue(float64(uintptr(x)))
case float32:
return floatValue(float64(x))
case float64:
return floatValue(x)
case string:
return makeValue(stringVal(x))
case []any:
a := arrayConstructor.New(len(x))
for i, s := range x {
a.SetIndex(i, s)
}
return a
case map[string]any:
o := objectConstructor.New()
for k, v := range x {
o.Set(k, v)
}
return o
default:
panic("ValueOf: invalid value")
}
}
// stringVal copies string x to Javascript and returns a ref.
//
// (noescape): This is safe because no references are maintained to the
// Go string x after the syscall returns.
//
//go:wasmimport gojs syscall/js.stringVal
//go:noescape
func stringVal(x string) ref
// Type represents the JavaScript type of a Value.
type Type int
const (
TypeUndefined Type = iota
TypeNull
TypeBoolean
TypeNumber
TypeString
TypeSymbol
TypeObject
TypeFunction
)
func (t Type) String() string {
switch t {
case TypeUndefined:
return "undefined"
case TypeNull:
return "null"
case TypeBoolean:
return "boolean"
case TypeNumber:
return "number"
case TypeString:
return "string"
case TypeSymbol:
return "symbol"
case TypeObject:
return "object"
case TypeFunction:
return "function"
default:
panic("bad type")
}
}
func (t Type) isObject() bool {
return t == TypeObject || t == TypeFunction
}
// Type returns the JavaScript type of the value v. It is similar to JavaScript's typeof operator,
// except that it returns TypeNull instead of TypeObject for null.
func (v Value) Type() Type {
switch v.ref {
case valueUndefined.ref:
return TypeUndefined
case valueNull.ref:
return TypeNull
case valueTrue.ref, valueFalse.ref:
return TypeBoolean
}
if v.isNumber() {
return TypeNumber
}
typeFlag := (v.ref >> 32) & 7
switch typeFlag {
case typeFlagObject:
return TypeObject
case typeFlagString:
return TypeString
case typeFlagSymbol:
return TypeSymbol
case typeFlagFunction:
return TypeFunction
default:
panic("bad type flag")
}
}
// Get returns the JavaScript property p of value v.
// It panics if v is not a JavaScript object.
func (v Value) Get(p string) Value {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.Get", vType})
}
r := makeValue(valueGet(v.ref, p))
runtime.KeepAlive(v)
return r
}
// valueGet returns a ref to JavaScript property p of ref v.
//
// (noescape): This is safe because no references are maintained to the
// Go string p after the syscall returns.
//
//go:wasmimport gojs syscall/js.valueGet
//go:noescape
func valueGet(v ref, p string) ref
// Set sets the JavaScript property p of value v to ValueOf(x).
// It panics if v is not a JavaScript object.
func (v Value) Set(p string, x any) {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.Set", vType})
}
xv := ValueOf(x)
valueSet(v.ref, p, xv.ref)
runtime.KeepAlive(v)
runtime.KeepAlive(xv)
}
// valueSet sets property p of ref v to ref x.
//
// (noescape): This is safe because no references are maintained to the
// Go string p after the syscall returns.
//
//go:wasmimport gojs syscall/js.valueSet
//go:noescape
func valueSet(v ref, p string, x ref)
// Delete deletes the JavaScript property p of value v.
// It panics if v is not a JavaScript object.
func (v Value) Delete(p string) {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.Delete", vType})
}
valueDelete(v.ref, p)
runtime.KeepAlive(v)
}
// valueDelete deletes the JavaScript property p of ref v.
//
// (noescape): This is safe because no references are maintained to the
// Go string p after the syscall returns.
//
//go:wasmimport gojs syscall/js.valueDelete
//go:noescape
func valueDelete(v ref, p string)
// Index returns JavaScript index i of value v.
// It panics if v is not a JavaScript object.
func (v Value) Index(i int) Value {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.Index", vType})
}
r := makeValue(valueIndex(v.ref, i))
runtime.KeepAlive(v)
return r
}
//go:wasmimport gojs syscall/js.valueIndex
func valueIndex(v ref, i int) ref
// SetIndex sets the JavaScript index i of value v to ValueOf(x).
// It panics if v is not a JavaScript object.
func (v Value) SetIndex(i int, x any) {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.SetIndex", vType})
}
xv := ValueOf(x)
valueSetIndex(v.ref, i, xv.ref)
runtime.KeepAlive(v)
runtime.KeepAlive(xv)
}
//go:wasmimport gojs syscall/js.valueSetIndex
func valueSetIndex(v ref, i int, x ref)
// makeArgSlices makes two slices to hold JavaScript arg data.
// It can be paired with storeArgs to make-and-store JavaScript arg slices.
// However, the two functions are separated to ensure makeArgSlices is inlined
// which will prevent the slices from being heap allocated for small (<=16)
// numbers of args.
func makeArgSlices(size int) (argVals []Value, argRefs []ref) {
// value chosen for being power of two, and enough to handle all web APIs
// in particular, note that WebGL2's texImage2D takes up to 10 arguments
const maxStackArgs = 16
if size <= maxStackArgs {
// as long as makeArgs is inlined, these will be stack-allocated
argVals = make([]Value, size, maxStackArgs)
argRefs = make([]ref, size, maxStackArgs)
} else {
// allocates on the heap, but exceeding maxStackArgs should be rare
argVals = make([]Value, size)
argRefs = make([]ref, size)
}
return
}
// storeArgs maps input args onto respective Value and ref slices.
// It can be paired with makeArgSlices to make-and-store JavaScript arg slices.
func storeArgs(args []any, argValsDst []Value, argRefsDst []ref) {
// would go in makeArgs if the combined func was simple enough to inline
for i, arg := range args {
v := ValueOf(arg)
argValsDst[i] = v
argRefsDst[i] = v.ref
}
}
// Length returns the JavaScript property "length" of v.
// It panics if v is not a JavaScript object.
func (v Value) Length() int {
if vType := v.Type(); !vType.isObject() {
panic(&ValueError{"Value.SetIndex", vType})
}
r := valueLength(v.ref)
runtime.KeepAlive(v)
return r
}
//go:wasmimport gojs syscall/js.valueLength
func valueLength(v ref) int
// Call does a JavaScript call to the method m of value v with the given arguments.
// It panics if v has no method m.
// The arguments get mapped to JavaScript values according to the ValueOf function.
func (v Value) Call(m string, args ...any) Value {
argVals, argRefs := makeArgSlices(len(args))
storeArgs(args, argVals, argRefs)
res, ok := valueCall(v.ref, m, argRefs)
runtime.KeepAlive(v)
runtime.KeepAlive(argVals)
if !ok {
if vType := v.Type(); !vType.isObject() { // check here to avoid overhead in success case
panic(&ValueError{"Value.Call", vType})
}
if propType := v.Get(m).Type(); propType != TypeFunction {
panic("syscall/js: Value.Call: property " + m + " is not a function, got " + propType.String())
}
panic(Error{makeValue(res)})
}
return makeValue(res)
}
// valueCall does a JavaScript call to the method name m of ref v with the given arguments.
//
// (noescape): This is safe because no references are maintained to the
// Go string m after the syscall returns. Additionally, the args slice
// is only used temporarily to collect the JavaScript objects for
// the JavaScript method invocation.
//
//go:wasmimport gojs syscall/js.valueCall
//go:nosplit
//go:noescape
func valueCall(v ref, m string, args []ref) (ref, bool)
// Invoke does a JavaScript call of the value v with the given arguments.
// It panics if v is not a JavaScript function.
// The arguments get mapped to JavaScript values according to the ValueOf function.
func (v Value) Invoke(args ...any) Value {
argVals, argRefs := makeArgSlices(len(args))
storeArgs(args, argVals, argRefs)
res, ok := valueInvoke(v.ref, argRefs)
runtime.KeepAlive(v)
runtime.KeepAlive(argVals)
if !ok {
if vType := v.Type(); vType != TypeFunction { // check here to avoid overhead in success case
panic(&ValueError{"Value.Invoke", vType})
}
panic(Error{makeValue(res)})
}
return makeValue(res)
}
// valueInvoke does a JavaScript call to value v with the given arguments.
//
// (noescape): This is safe because the args slice is only used temporarily
// to collect the JavaScript objects for the JavaScript method
// invocation.
//
//go:wasmimport gojs syscall/js.valueInvoke
//go:noescape
func valueInvoke(v ref, args []ref) (ref, bool)
// New uses JavaScript's "new" operator with value v as constructor and the given arguments.
// It panics if v is not a JavaScript function.
// The arguments get mapped to JavaScript values according to the ValueOf function.
func (v Value) New(args ...any) Value {
argVals, argRefs := makeArgSlices(len(args))
storeArgs(args, argVals, argRefs)
res, ok := valueNew(v.ref, argRefs)
runtime.KeepAlive(v)
runtime.KeepAlive(argVals)
if !ok {
if vType := v.Type(); vType != TypeFunction { // check here to avoid overhead in success case
panic(&ValueError{"Value.Invoke", vType})
}
panic(Error{makeValue(res)})
}
return makeValue(res)
}
// valueNew uses JavaScript's "new" operator with value v as a constructor and the given arguments.
//
// (noescape): This is safe because the args slice is only used temporarily
// to collect the JavaScript objects for the constructor execution.
//
//go:wasmimport gojs syscall/js.valueNew
//go:noescape
func valueNew(v ref, args []ref) (ref, bool)
func (v Value) isNumber() bool {
return v.ref == valueZero.ref ||
v.ref == valueNaN.ref ||
(v.ref != valueUndefined.ref && (v.ref>>32)&nanHead != nanHead)
}
func (v Value) float(method string) float64 {
if !v.isNumber() {
panic(&ValueError{method, v.Type()})
}
if v.ref == valueZero.ref {
return 0
}
return *(*float64)(unsafe.Pointer(&v.ref))
}
// Float returns the value v as a float64.
// It panics if v is not a JavaScript number.
func (v Value) Float() float64 {
return v.float("Value.Float")
}
// Int returns the value v truncated to an int.
// It panics if v is not a JavaScript number.
func (v Value) Int() int {
return int(v.float("Value.Int"))
}
// Bool returns the value v as a bool.
// It panics if v is not a JavaScript boolean.
func (v Value) Bool() bool {
switch v.ref {
case valueTrue.ref:
return true
case valueFalse.ref:
return false
default:
panic(&ValueError{"Value.Bool", v.Type()})
}
}
// Truthy returns the JavaScript "truthiness" of the value v. In JavaScript,
// false, 0, "", null, undefined, and NaN are "falsy", and everything else is
// "truthy". See https://developer.mozilla.org/en-US/docs/Glossary/Truthy.
func (v Value) Truthy() bool {
switch v.Type() {
case TypeUndefined, TypeNull:
return false
case TypeBoolean:
return v.Bool()
case TypeNumber:
return v.ref != valueNaN.ref && v.ref != valueZero.ref
case TypeString:
return v.String() != ""
case TypeSymbol, TypeFunction, TypeObject:
return true
default:
panic("bad type")
}
}
// String returns the value v as a string.
// String is a special case because of Go's String method convention. Unlike the other getters,
// it does not panic if v's Type is not TypeString. Instead, it returns a string of the form "<T>"
// or "<T: V>" where T is v's type and V is a string representation of v's value.
func (v Value) String() string {
switch v.Type() {
case TypeString:
return jsString(v)
case TypeUndefined:
return "<undefined>"
case TypeNull:
return "<null>"
case TypeBoolean:
return "<boolean: " + jsString(v) + ">"
case TypeNumber:
return "<number: " + jsString(v) + ">"
case TypeSymbol:
return "<symbol>"
case TypeObject:
return "<object>"
case TypeFunction:
return "<function>"
default:
panic("bad type")
}
}
func jsString(v Value) string {
str, length := valuePrepareString(v.ref)
runtime.KeepAlive(v)
b := make([]byte, length)
valueLoadString(str, b)
finalizeRef(str)
return string(b)
}
//go:wasmimport gojs syscall/js.valuePrepareString
func valuePrepareString(v ref) (ref, int)
// valueLoadString loads string data located at ref v into byte slice b.
//
// (noescape): This is safe because the byte slice is only used as a destination
// for storing the string data and references to it are not maintained.
//
//go:wasmimport gojs syscall/js.valueLoadString
//go:noescape
func valueLoadString(v ref, b []byte)
// InstanceOf reports whether v is an instance of type t according to JavaScript's instanceof operator.
func (v Value) InstanceOf(t Value) bool {
r := valueInstanceOf(v.ref, t.ref)
runtime.KeepAlive(v)
runtime.KeepAlive(t)
return r
}
//go:wasmimport gojs syscall/js.valueInstanceOf
func valueInstanceOf(v ref, t ref) bool
// A ValueError occurs when a Value method is invoked on
// a Value that does not support it. Such cases are documented
// in the description of each method.
type ValueError struct {
Method string
Type Type
}
func (e *ValueError) Error() string {
return "syscall/js: call of " + e.Method + " on " + e.Type.String()
}
// CopyBytesToGo copies bytes from src to dst.
// It panics if src is not a Uint8Array or Uint8ClampedArray.
// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.
func CopyBytesToGo(dst []byte, src Value) int {
n, ok := copyBytesToGo(dst, src.ref)
runtime.KeepAlive(src)
if !ok {
panic("syscall/js: CopyBytesToGo: expected src to be a Uint8Array or Uint8ClampedArray")
}
return n
}
// copyBytesToGo copies bytes from src to dst.
//
// (noescape): This is safe because the dst byte slice is only used as a dst
// copy buffer and no references to it are maintained.
//
//go:wasmimport gojs syscall/js.copyBytesToGo
//go:noescape
func copyBytesToGo(dst []byte, src ref) (int, bool)
// CopyBytesToJS copies bytes from src to dst.
// It panics if dst is not a Uint8Array or Uint8ClampedArray.
// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.
func CopyBytesToJS(dst Value, src []byte) int {
n, ok := copyBytesToJS(dst.ref, src)
runtime.KeepAlive(dst)
if !ok {
panic("syscall/js: CopyBytesToJS: expected dst to be a Uint8Array or Uint8ClampedArray")
}
return n
}
// copyBytesToJs copies bytes from src to dst.
//
// (noescape): This is safe because the src byte slice is only used as a src
// copy buffer and no references to it are maintained.
//
//go:wasmimport gojs syscall/js.copyBytesToJS
//go:noescape
func copyBytesToJS(dst ref, src []byte) (int, bool)

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The runtime package uses //go:linkname to push the setEventHandler to this
// package. To prevent the go tool from passing -complete to the compile tool,
// this file must remain stubbed out.

690
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build js && wasm
// To run these tests:
//
// - Install Node
// - Add /path/to/go/misc/wasm to your $PATH (so that "go test" can find
// "go_js_wasm_exec").
// - GOOS=js GOARCH=wasm go test
//
// See -exec in "go help test", and "go help run" for details.
package js_test
import (
"fmt"
"math"
"runtime"
"syscall/js"
"testing"
)
var dummys = js.Global().Call("eval", `({
someBool: true,
someString: "abc\u1234",
someInt: 42,
someFloat: 42.123,
someArray: [41, 42, 43],
someDate: new Date(),
add: function(a, b) {
return a + b;
},
zero: 0,
stringZero: "0",
NaN: NaN,
emptyObj: {},
emptyArray: [],
Infinity: Infinity,
NegInfinity: -Infinity,
objNumber0: new Number(0),
objBooleanFalse: new Boolean(false),
})`)
//go:wasmimport _gotest add
func testAdd(uint32, uint32) uint32
func TestWasmImport(t *testing.T) {
a := uint32(3)
b := uint32(5)
want := a + b
if got := testAdd(a, b); got != want {
t.Errorf("got %v, want %v", got, want)
}
}
func TestBool(t *testing.T) {
want := true
o := dummys.Get("someBool")
if got := o.Bool(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherBool", want)
if got := dummys.Get("otherBool").Bool(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someBool").Equal(dummys.Get("someBool")) {
t.Errorf("same value not equal")
}
}
func TestString(t *testing.T) {
want := "abc\u1234"
o := dummys.Get("someString")
if got := o.String(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherString", want)
if got := dummys.Get("otherString").String(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someString").Equal(dummys.Get("someString")) {
t.Errorf("same value not equal")
}
if got, want := js.Undefined().String(), "<undefined>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Null().String(), "<null>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.ValueOf(true).String(), "<boolean: true>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.ValueOf(42.5).String(), "<number: 42.5>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().Call("Symbol").String(), "<symbol>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().String(), "<object>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().Get("setTimeout").String(), "<function>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestInt(t *testing.T) {
want := 42
o := dummys.Get("someInt")
if got := o.Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherInt", want)
if got := dummys.Get("otherInt").Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someInt").Equal(dummys.Get("someInt")) {
t.Errorf("same value not equal")
}
if got := dummys.Get("zero").Int(); got != 0 {
t.Errorf("got %#v, want %#v", got, 0)
}
}
func TestIntConversion(t *testing.T) {
testIntConversion(t, 0)
testIntConversion(t, 1)
testIntConversion(t, -1)
testIntConversion(t, 1<<20)
testIntConversion(t, -1<<20)
testIntConversion(t, 1<<40)
testIntConversion(t, -1<<40)
testIntConversion(t, 1<<60)
testIntConversion(t, -1<<60)
}
func testIntConversion(t *testing.T, want int) {
if got := js.ValueOf(want).Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestFloat(t *testing.T) {
want := 42.123
o := dummys.Get("someFloat")
if got := o.Float(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherFloat", want)
if got := dummys.Get("otherFloat").Float(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someFloat").Equal(dummys.Get("someFloat")) {
t.Errorf("same value not equal")
}
}
func TestObject(t *testing.T) {
if !dummys.Get("someArray").Equal(dummys.Get("someArray")) {
t.Errorf("same value not equal")
}
// An object and its prototype should not be equal.
proto := js.Global().Get("Object").Get("prototype")
o := js.Global().Call("eval", "new Object()")
if proto.Equal(o) {
t.Errorf("object equals to its prototype")
}
}
func TestFrozenObject(t *testing.T) {
o := js.Global().Call("eval", "(function () { let o = new Object(); o.field = 5; Object.freeze(o); return o; })()")
want := 5
if got := o.Get("field").Int(); want != got {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestEqual(t *testing.T) {
if !dummys.Get("someFloat").Equal(dummys.Get("someFloat")) {
t.Errorf("same float is not equal")
}
if !dummys.Get("emptyObj").Equal(dummys.Get("emptyObj")) {
t.Errorf("same object is not equal")
}
if dummys.Get("someFloat").Equal(dummys.Get("someInt")) {
t.Errorf("different values are not unequal")
}
}
func TestNaN(t *testing.T) {
if !dummys.Get("NaN").IsNaN() {
t.Errorf("JS NaN is not NaN")
}
if !js.ValueOf(math.NaN()).IsNaN() {
t.Errorf("Go NaN is not NaN")
}
if dummys.Get("NaN").Equal(dummys.Get("NaN")) {
t.Errorf("NaN is equal to NaN")
}
}
func TestUndefined(t *testing.T) {
if !js.Undefined().IsUndefined() {
t.Errorf("undefined is not undefined")
}
if !js.Undefined().Equal(js.Undefined()) {
t.Errorf("undefined is not equal to undefined")
}
if dummys.IsUndefined() {
t.Errorf("object is undefined")
}
if js.Undefined().IsNull() {
t.Errorf("undefined is null")
}
if dummys.Set("test", js.Undefined()); !dummys.Get("test").IsUndefined() {
t.Errorf("could not set undefined")
}
}
func TestNull(t *testing.T) {
if !js.Null().IsNull() {
t.Errorf("null is not null")
}
if !js.Null().Equal(js.Null()) {
t.Errorf("null is not equal to null")
}
if dummys.IsNull() {
t.Errorf("object is null")
}
if js.Null().IsUndefined() {
t.Errorf("null is undefined")
}
if dummys.Set("test", js.Null()); !dummys.Get("test").IsNull() {
t.Errorf("could not set null")
}
if dummys.Set("test", nil); !dummys.Get("test").IsNull() {
t.Errorf("could not set nil")
}
}
func TestLength(t *testing.T) {
if got := dummys.Get("someArray").Length(); got != 3 {
t.Errorf("got %#v, want %#v", got, 3)
}
}
func TestGet(t *testing.T) {
// positive cases get tested per type
expectValueError(t, func() {
dummys.Get("zero").Get("badField")
})
}
func TestSet(t *testing.T) {
// positive cases get tested per type
expectValueError(t, func() {
dummys.Get("zero").Set("badField", 42)
})
}
func TestDelete(t *testing.T) {
dummys.Set("test", 42)
dummys.Delete("test")
if dummys.Call("hasOwnProperty", "test").Bool() {
t.Errorf("property still exists")
}
expectValueError(t, func() {
dummys.Get("zero").Delete("badField")
})
}
func TestIndex(t *testing.T) {
if got := dummys.Get("someArray").Index(1).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").Index(1)
})
}
func TestSetIndex(t *testing.T) {
dummys.Get("someArray").SetIndex(2, 99)
if got := dummys.Get("someArray").Index(2).Int(); got != 99 {
t.Errorf("got %#v, want %#v", got, 99)
}
expectValueError(t, func() {
dummys.Get("zero").SetIndex(2, 99)
})
}
func TestCall(t *testing.T) {
var i int64 = 40
if got := dummys.Call("add", i, 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
if got := dummys.Call("add", js.Global().Call("eval", "40"), 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectPanic(t, func() {
dummys.Call("zero")
})
expectValueError(t, func() {
dummys.Get("zero").Call("badMethod")
})
}
func TestInvoke(t *testing.T) {
var i int64 = 40
if got := dummys.Get("add").Invoke(i, 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").Invoke()
})
}
func TestNew(t *testing.T) {
if got := js.Global().Get("Array").New(42).Length(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").New()
})
}
func TestInstanceOf(t *testing.T) {
someArray := js.Global().Get("Array").New()
if got, want := someArray.InstanceOf(js.Global().Get("Array")), true; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := someArray.InstanceOf(js.Global().Get("Function")), false; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestType(t *testing.T) {
if got, want := js.Undefined().Type(), js.TypeUndefined; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Null().Type(), js.TypeNull; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(true).Type(), js.TypeBoolean; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(0).Type(), js.TypeNumber; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(42).Type(), js.TypeNumber; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf("test").Type(), js.TypeString; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Symbol").Invoke("test").Type(), js.TypeSymbol; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Array").New().Type(), js.TypeObject; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Array").Type(), js.TypeFunction; got != want {
t.Errorf("got %s, want %s", got, want)
}
}
type object = map[string]any
type array = []any
func TestValueOf(t *testing.T) {
a := js.ValueOf(array{0, array{0, 42, 0}, 0})
if got := a.Index(1).Index(1).Int(); got != 42 {
t.Errorf("got %v, want %v", got, 42)
}
o := js.ValueOf(object{"x": object{"y": 42}})
if got := o.Get("x").Get("y").Int(); got != 42 {
t.Errorf("got %v, want %v", got, 42)
}
}
func TestZeroValue(t *testing.T) {
var v js.Value
if !v.IsUndefined() {
t.Error("zero js.Value is not js.Undefined()")
}
}
func TestFuncOf(t *testing.T) {
c := make(chan struct{})
cb := js.FuncOf(func(this js.Value, args []js.Value) any {
if got := args[0].Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
c <- struct{}{}
return nil
})
defer cb.Release()
js.Global().Call("setTimeout", cb, 0, 42)
<-c
}
func TestInvokeFunction(t *testing.T) {
called := false
cb := js.FuncOf(func(this js.Value, args []js.Value) any {
cb2 := js.FuncOf(func(this js.Value, args []js.Value) any {
called = true
return 42
})
defer cb2.Release()
return cb2.Invoke()
})
defer cb.Release()
if got := cb.Invoke().Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
if !called {
t.Error("function not called")
}
}
func TestInterleavedFunctions(t *testing.T) {
c1 := make(chan struct{})
c2 := make(chan struct{})
js.Global().Get("setTimeout").Invoke(js.FuncOf(func(this js.Value, args []js.Value) any {
c1 <- struct{}{}
<-c2
return nil
}), 0)
<-c1
c2 <- struct{}{}
// this goroutine is running, but the callback of setTimeout did not return yet, invoke another function now
f := js.FuncOf(func(this js.Value, args []js.Value) any {
return nil
})
f.Invoke()
}
func ExampleFuncOf() {
var cb js.Func
cb = js.FuncOf(func(this js.Value, args []js.Value) any {
fmt.Println("button clicked")
cb.Release() // release the function if the button will not be clicked again
return nil
})
js.Global().Get("document").Call("getElementById", "myButton").Call("addEventListener", "click", cb)
}
// See
// - https://developer.mozilla.org/en-US/docs/Glossary/Truthy
// - https://stackoverflow.com/questions/19839952/all-falsey-values-in-javascript/19839953#19839953
// - http://www.ecma-international.org/ecma-262/5.1/#sec-9.2
func TestTruthy(t *testing.T) {
want := true
for _, key := range []string{
"someBool", "someString", "someInt", "someFloat", "someArray", "someDate",
"stringZero", // "0" is truthy
"add", // functions are truthy
"emptyObj", "emptyArray", "Infinity", "NegInfinity",
// All objects are truthy, even if they're Number(0) or Boolean(false).
"objNumber0", "objBooleanFalse",
} {
if got := dummys.Get(key).Truthy(); got != want {
t.Errorf("%s: got %#v, want %#v", key, got, want)
}
}
want = false
if got := dummys.Get("zero").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := dummys.Get("NaN").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.ValueOf("").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.Null().Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.Undefined().Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func expectValueError(t *testing.T, fn func()) {
defer func() {
err := recover()
if _, ok := err.(*js.ValueError); !ok {
t.Errorf("expected *js.ValueError, got %T", err)
}
}()
fn()
}
func expectPanic(t *testing.T, fn func()) {
defer func() {
err := recover()
if err == nil {
t.Errorf("expected panic")
}
}()
fn()
}
var copyTests = []struct {
srcLen int
dstLen int
copyLen int
}{
{5, 3, 3},
{3, 5, 3},
{0, 0, 0},
}
func TestCopyBytesToGo(t *testing.T) {
for _, tt := range copyTests {
t.Run(fmt.Sprintf("%d-to-%d", tt.srcLen, tt.dstLen), func(t *testing.T) {
src := js.Global().Get("Uint8Array").New(tt.srcLen)
if tt.srcLen >= 2 {
src.SetIndex(1, 42)
}
dst := make([]byte, tt.dstLen)
if got, want := js.CopyBytesToGo(dst, src), tt.copyLen; got != want {
t.Errorf("copied %d, want %d", got, want)
}
if tt.dstLen >= 2 {
if got, want := int(dst[1]), 42; got != want {
t.Errorf("got %d, want %d", got, want)
}
}
})
}
}
func TestCopyBytesToJS(t *testing.T) {
for _, tt := range copyTests {
t.Run(fmt.Sprintf("%d-to-%d", tt.srcLen, tt.dstLen), func(t *testing.T) {
src := make([]byte, tt.srcLen)
if tt.srcLen >= 2 {
src[1] = 42
}
dst := js.Global().Get("Uint8Array").New(tt.dstLen)
if got, want := js.CopyBytesToJS(dst, src), tt.copyLen; got != want {
t.Errorf("copied %d, want %d", got, want)
}
if tt.dstLen >= 2 {
if got, want := dst.Index(1).Int(), 42; got != want {
t.Errorf("got %d, want %d", got, want)
}
}
})
}
}
func TestGarbageCollection(t *testing.T) {
before := js.JSGo.Get("_values").Length()
for i := 0; i < 1000; i++ {
_ = js.Global().Get("Object").New().Call("toString").String()
runtime.GC()
}
after := js.JSGo.Get("_values").Length()
if after-before > 500 {
t.Errorf("garbage collection ineffective")
}
}
// This table is used for allocation tests. We expect a specific allocation
// behavior to be seen, depending on the number of arguments applied to various
// JavaScript functions.
// Note: All JavaScript functions return a JavaScript array, which will cause
// one allocation to be created to track the Value.gcPtr for the Value finalizer.
var allocTests = []struct {
argLen int // The number of arguments to use for the syscall
expected int // The expected number of allocations
}{
// For less than or equal to 16 arguments, we expect 1 alloction:
// - makeValue new(ref)
{0, 1},
{2, 1},
{15, 1},
{16, 1},
// For greater than 16 arguments, we expect 3 alloction:
// - makeValue: new(ref)
// - makeArgSlices: argVals = make([]Value, size)
// - makeArgSlices: argRefs = make([]ref, size)
{17, 3},
{32, 3},
{42, 3},
}
// TestCallAllocations ensures the correct allocation profile for Value.Call
func TestCallAllocations(t *testing.T) {
for _, test := range allocTests {
args := make([]any, test.argLen)
tmpArray := js.Global().Get("Array").New(0)
numAllocs := testing.AllocsPerRun(100, func() {
tmpArray.Call("concat", args...)
});
if numAllocs != float64(test.expected) {
t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
}
}
}
// TestInvokeAllocations ensures the correct allocation profile for Value.Invoke
func TestInvokeAllocations(t *testing.T) {
for _, test := range allocTests {
args := make([]any, test.argLen)
tmpArray := js.Global().Get("Array").New(0)
concatFunc := tmpArray.Get("concat").Call("bind", tmpArray)
numAllocs := testing.AllocsPerRun(100, func() {
concatFunc.Invoke(args...)
});
if numAllocs != float64(test.expected) {
t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
}
}
}
// TestNewAllocations ensures the correct allocation profile for Value.New
func TestNewAllocations(t *testing.T) {
arrayConstructor := js.Global().Get("Array")
for _, test := range allocTests {
args := make([]any, test.argLen)
numAllocs := testing.AllocsPerRun(100, func() {
arrayConstructor.New(args...)
});
if numAllocs != float64(test.expected) {
t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
}
}
}
// BenchmarkDOM is a simple benchmark which emulates a webapp making DOM operations.
// It creates a div, and sets its id. Then searches by that id and sets some data.
// Finally it removes that div.
func BenchmarkDOM(b *testing.B) {
document := js.Global().Get("document")
if document.IsUndefined() {
b.Skip("Not a browser environment. Skipping.")
}
const data = "someString"
for i := 0; i < b.N; i++ {
div := document.Call("createElement", "div")
div.Call("setAttribute", "id", "myDiv")
document.Get("body").Call("appendChild", div)
myDiv := document.Call("getElementById", "myDiv")
myDiv.Set("innerHTML", data)
if got, want := myDiv.Get("innerHTML").String(), data; got != want {
b.Errorf("got %s, want %s", got, want)
}
document.Get("body").Call("removeChild", div)
}
}
func TestGlobal(t *testing.T) {
ident := js.FuncOf(func(this js.Value, args []js.Value) any {
return args[0]
})
defer ident.Release()
if got := ident.Invoke(js.Global()); !got.Equal(js.Global()) {
t.Errorf("got %#v, want %#v", got, js.Global())
}
}

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src/syscall/linkname_bsd.go Normal file
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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
package syscall
import _ "unsafe"
// used by internal/syscall/unix
//go:linkname ioctlPtr
// golang.org/x/net linknames sysctl.
// Do not remove or change the type signature.
//
//go:linkname sysctl

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src/syscall/linkname_darwin.go Normal file
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@@ -0,0 +1,23 @@
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import _ "unsafe"
// used by os
//go:linkname closedir
//go:linkname readdir_r
// used by internal/poll
//go:linkname fdopendir
// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat
// used by cmd/link
//go:linkname msync
//go:linkname fcntl

12
src/syscall/linkname_libc.go Normal file
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@@ -0,0 +1,12 @@
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || darwin || (openbsd && !mips64) || solaris
package syscall
import _ "unsafe"
// used by internal/poll
//go:linkname writev

15
src/syscall/linkname_openbsd.go Normal file
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@@ -0,0 +1,15 @@
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build openbsd && !mips64
package syscall
import _ "unsafe"
// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat
//go:linkname getentropy

20
src/syscall/linkname_unix.go Normal file
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@@ -0,0 +1,20 @@
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package syscall
import _ "unsafe" // for linkname
// mmap should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
// - modernc.org/memory
// - github.com/ncruces/go-sqlite3
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname mmap

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src/syscall/lsf_linux.go Normal file
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@@ -0,0 +1,86 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Linux socket filter
package syscall
import (
"unsafe"
)
// Deprecated: Use golang.org/x/net/bpf instead.
func LsfStmt(code, k int) *SockFilter {
return &SockFilter{Code: uint16(code), K: uint32(k)}
}
// Deprecated: Use golang.org/x/net/bpf instead.
func LsfJump(code, k, jt, jf int) *SockFilter {
return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
}
// Deprecated: Use golang.org/x/net/bpf instead.
func LsfSocket(ifindex, proto int) (int, error) {
var lsall SockaddrLinklayer
// This is missing SOCK_CLOEXEC, but adding the flag
// could break callers.
s, e := Socket(AF_PACKET, SOCK_RAW, proto)
if e != nil {
return 0, e
}
p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
p[0] = byte(proto >> 8)
p[1] = byte(proto)
lsall.Ifindex = ifindex
e = Bind(s, &lsall)
if e != nil {
Close(s)
return 0, e
}
return s, nil
}
type iflags struct {
name [IFNAMSIZ]byte
flags uint16
}
// Deprecated: Use golang.org/x/net/bpf instead.
func SetLsfPromisc(name string, m bool) error {
s, e := Socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0)
if e != nil {
return e
}
defer Close(s)
var ifl iflags
copy(ifl.name[:], []byte(name))
_, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
if ep != 0 {
return Errno(ep)
}
if m {
ifl.flags |= uint16(IFF_PROMISC)
} else {
ifl.flags &^= uint16(IFF_PROMISC)
}
_, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
if ep != 0 {
return Errno(ep)
}
return nil
}
// Deprecated: Use golang.org/x/net/bpf instead.
func AttachLsf(fd int, i []SockFilter) error {
var p SockFprog
p.Len = uint16(len(i))
p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), unsafe.Sizeof(p))
}
// Deprecated: Use golang.org/x/net/bpf instead.
func DetachLsf(fd int) error {
var dummy int
return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), unsafe.Sizeof(dummy))
}

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#!/usr/bin/env bash
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# The syscall package provides access to the raw system call
# interface of the underlying operating system. Porting Go to
# a new architecture/operating system combination requires
# some manual effort, though there are tools that automate
# much of the process. The auto-generated files have names
# beginning with z.
#
# This script runs or (given -n) prints suggested commands to generate z files
# for the current system. Running those commands is not automatic.
# This script is documentation more than anything else.
#
# * asm_${GOOS}_${GOARCH}.s
#
# This hand-written assembly file implements system call dispatch.
# There are three entry points:
#
# func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr);
# func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
# func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr);
#
# The first and second are the standard ones; they differ only in
# how many arguments can be passed to the kernel.
# The third is for low-level use by the ForkExec wrapper;
# unlike the first two, it does not call into the scheduler to
# let it know that a system call is running.
#
# * syscall_${GOOS}.go
#
# This hand-written Go file implements system calls that need
# special handling and lists "//sys" comments giving prototypes
# for ones that can be auto-generated. Mksyscall reads those
# comments to generate the stubs.
#
# * syscall_${GOOS}_${GOARCH}.go
#
# Same as syscall_${GOOS}.go except that it contains code specific
# to ${GOOS} on one particular architecture.
#
# * types_${GOOS}.c
#
# This hand-written C file includes standard C headers and then
# creates typedef or enum names beginning with a dollar sign
# (use of $ in variable names is a gcc extension). The hardest
# part about preparing this file is figuring out which headers to
# include and which symbols need to be #defined to get the
# actual data structures that pass through to the kernel system calls.
# Some C libraries present alternate versions for binary compatibility
# and translate them on the way in and out of system calls, but
# there is almost always a #define that can get the real ones.
# See types_darwin.c and types_linux.c for examples.
#
# * zerror_${GOOS}_${GOARCH}.go
#
# This machine-generated file defines the system's error numbers,
# error strings, and signal numbers. The generator is "mkerrors.sh".
# Usually no arguments are needed, but mkerrors.sh will pass its
# arguments on to godefs.
#
# * zsyscall_${GOOS}_${GOARCH}.go
#
# Generated by mksyscall.pl; see syscall_${GOOS}.go above.
#
# * zsysnum_${GOOS}_${GOARCH}.go
#
# Generated by mksysnum_${GOOS}.
#
# * ztypes_${GOOS}_${GOARCH}.go
#
# Generated by godefs; see types_${GOOS}.c above.
GOOSARCH="${GOOS}_${GOARCH}"
# defaults
mksyscall="./mksyscall.pl"
mkerrors="./mkerrors.sh"
zerrors="zerrors_$GOOSARCH.go"
mksysctl=""
zsysctl="zsysctl_$GOOSARCH.go"
mksysnum=
mktypes=
mkasm=
run="sh"
case "$1" in
-syscalls)
shift
for i in ${@:-zsyscall*go}
do
# Run the command line that appears in the first line
# of the generated file to regenerate it.
sed 1q $i | sed 's;^// ;./;' | sh > _$i && gofmt < _$i > $i
rm _$i
done
exit 0
;;
-n)
run="cat"
shift
esac
case "$#" in
0)
;;
*)
echo 'usage: mkall.sh [-n]' 1>&2
exit 2
esac
GOOSARCH_in=syscall_$GOOSARCH.go
case "$GOOSARCH" in
_* | *_ | _)
echo 'undefined $GOOS_$GOARCH:' "$GOOSARCH" 1>&2
exit 1
;;
aix_ppc64)
mkerrors="$mkerrors -maix64"
mksyscall="./mksyscall_libc.pl -aix"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
darwin_amd64)
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -darwin"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
mkasm="go run mkasm.go"
;;
darwin_arm64)
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -darwin"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
mkasm="go run mkasm.go"
;;
dragonfly_amd64)
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -dragonfly"
mksysnum="curl -s 'http://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/kern/syscalls.master' | ./mksysnum_dragonfly.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
freebsd_386)
mkerrors="$mkerrors -m32"
mksyscall="./mksyscall.pl -l32"
mksysnum="curl -s 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master' | ./mksysnum_freebsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
freebsd_amd64)
mkerrors="$mkerrors -m64"
mksysnum="curl -s 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master' | ./mksysnum_freebsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
freebsd_arm)
mkerrors="$mkerrors"
mksyscall="./mksyscall.pl -l32 -arm"
mksysnum="curl -s 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master' | ./mksysnum_freebsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
;;
freebsd_arm64)
mkerrors="$mkerrors"
mksysnum="curl -s 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master' | ./mksysnum_freebsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
;;
freebsd_riscv64)
mkerrors="$mkerrors"
mksysnum="curl -s 'https://cgit.freebsd.org/src/plain/sys/kern/syscalls.master?h=stable/12' | ./mksysnum_freebsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
;;
linux_386)
mkerrors="$mkerrors -m32"
mksyscall="./mksyscall.pl -l32"
mksysnum="./mksysnum_linux.pl /usr/include/asm/unistd_32.h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_amd64)
unistd_h=$(ls -1 /usr/include/asm/unistd_64.h /usr/include/x86_64-linux-gnu/asm/unistd_64.h 2>/dev/null | head -1)
if [ "$unistd_h" = "" ]; then
echo >&2 cannot find unistd_64.h
exit 1
fi
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_arm)
GOOSARCH_in="syscall_linux_arm.go syscall_linux_accept.go"
mkerrors="$mkerrors"
mksyscall="./mksyscall.pl -l32 -arm"
mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl -"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_arm64)
unistd_h=$(ls -1 /usr/include/asm/unistd.h /usr/include/asm-generic/unistd.h 2>/dev/null | head -1)
if [ "$unistd_h" = "" ]; then
echo >&2 cannot find unistd_64.h
exit 1
fi
mksysnum="./mksysnum_linux.pl $unistd_h"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
;;
linux_loong64)
GOOSARCH_in=syscall_linux_loong64.go
unistd_h=$(ls -1 /usr/include/asm/unistd.h /usr/include/asm-generic/unistd.h 2>/dev/null | head -1)
if [ "$unistd_h" = "" ]; then
echo >&2 cannot find unistd.h
exit 1
fi
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_mips)
GOOSARCH_in=syscall_linux_mipsx.go
unistd_h=/usr/include/asm/unistd.h
mksyscall="./mksyscall.pl -b32 -arm"
mkerrors="$mkerrors"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_mipsle)
GOOSARCH_in=syscall_linux_mipsx.go
unistd_h=/usr/include/asm/unistd.h
mksyscall="./mksyscall.pl -l32 -arm"
mkerrors="$mkerrors"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_mips64)
GOOSARCH_in=syscall_linux_mips64x.go
unistd_h=/usr/include/asm/unistd.h
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_mips64le)
GOOSARCH_in=syscall_linux_mips64x.go
unistd_h=/usr/include/asm/unistd.h
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_ppc64)
GOOSARCH_in=syscall_linux_ppc64x.go
unistd_h=/usr/include/asm/unistd.h
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_ppc64le)
GOOSARCH_in=syscall_linux_ppc64x.go
unistd_h=/usr/include/powerpc64le-linux-gnu/asm/unistd.h
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_riscv64)
unistd_h=$(ls -1 /usr/include/asm/unistd.h /usr/include/asm-generic/unistd.h 2>/dev/null | head -1)
if [ "$unistd_h" = "" ]; then
echo >&2 cannot find unistd_64.h
exit 1
fi
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
linux_s390x)
GOOSARCH_in=syscall_linux_s390x.go
unistd_h=/usr/include/asm/unistd.h
mkerrors="$mkerrors -m64"
mksysnum="./mksysnum_linux.pl $unistd_h"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
netbsd_386)
mkerrors="$mkerrors -m32"
mksyscall="./mksyscall.pl -l32 -netbsd"
mksysnum="curl -s 'http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_netbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
netbsd_amd64)
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -netbsd"
mksysnum="curl -s 'http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_netbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
netbsd_arm)
mkerrors="$mkerrors -m32"
mksyscall="./mksyscall.pl -l32 -netbsd -arm"
mksysnum="curl -s 'http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_netbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
netbsd_arm64)
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -netbsd"
mksysnum="curl -s 'http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_netbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
openbsd_386)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m32"
mksyscall="./mksyscall.pl -l32 -openbsd -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
mkasm="go run mkasm.go"
;;
openbsd_amd64)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -openbsd -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
mkasm="go run mkasm.go"
;;
openbsd_arm)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors"
mksyscall="./mksyscall.pl -l32 -openbsd -arm -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
mkasm="go run mkasm.go"
;;
openbsd_arm64)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -openbsd -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
mkasm="go run mkasm.go"
;;
openbsd_mips64)
GOOSARCH_in="syscall_openbsd1.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -openbsd"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
;;
openbsd_ppc64)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -openbsd -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
mkasm="go run mkasm.go"
;;
openbsd_riscv64)
GOOSARCH_in="syscall_openbsd_libc.go syscall_openbsd_$GOARCH.go"
mkerrors="$mkerrors -m64"
mksyscall="./mksyscall.pl -openbsd -libc"
mksysctl="./mksysctl_openbsd.pl"
zsysctl="zsysctl_openbsd.go"
mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
# Let the type of C char be signed to make the bare syscall
# API consistent between platforms.
mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
mkasm="go run mkasm.go"
;;
plan9_386)
mkerrors=
mksyscall="./mksyscall.pl -l32 -plan9"
mksysnum="./mksysnum_plan9.sh /n/sources/plan9/sys/src/libc/9syscall/sys.h"
mktypes="XXX"
;;
solaris_amd64)
mksyscall="./mksyscall_libc.pl -solaris"
mkerrors="$mkerrors -m64"
mksysnum=
mktypes="GOARCH=$GOARCH go tool cgo -godefs"
;;
windows_*)
echo 'run "go generate" instead' 1>&2
exit 1
;;
*)
echo 'unrecognized $GOOS_$GOARCH: ' "$GOOSARCH" 1>&2
exit 1
;;
esac
(
if [ -n "$mkerrors" ]; then echo "$mkerrors |gofmt >$zerrors"; fi
syscall_goos="syscall_$GOOS.go"
case "$GOOS" in
darwin | dragonfly | freebsd | netbsd | openbsd)
syscall_goos="syscall_bsd.go $syscall_goos"
;;
esac
if [ -n "$mksyscall" ]; then echo "$mksyscall -tags $GOOS,$GOARCH $syscall_goos $GOOSARCH_in |gofmt >zsyscall_$GOOSARCH.go"; fi
if [ -n "$mksysctl" ]; then echo "$mksysctl |gofmt >$zsysctl"; fi
if [ -n "$mksysnum" ]; then echo "$mksysnum |gofmt >zsysnum_$GOOSARCH.go"; fi
if [ -n "$mktypes" ]; then
# ztypes_$GOOSARCH.go could be erased before "go run mkpost.go" is called.
# Therefore, "go run" tries to recompile syscall package but ztypes is empty and it fails.
echo "$mktypes types_$GOOS.go |go run mkpost.go >ztypes_$GOOSARCH.go.NEW && mv ztypes_$GOOSARCH.go.NEW ztypes_$GOOSARCH.go";
fi
if [ -n "$mkasm" ]; then echo "$mkasm $GOOS $GOARCH"; fi
) | $run

69
src/syscall/mkasm.go Normal file
View File

@@ -0,0 +1,69 @@
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// mkasm.go generates assembly trampolines to call library routines from Go.
// This program must be run after mksyscall.pl.
package main
import (
"bytes"
"fmt"
"log"
"os"
"strings"
)
func main() {
if len(os.Args) != 3 {
log.Fatalf("Usage: %s <goos> <arch>", os.Args[0])
}
goos, arch := os.Args[1], os.Args[2]
syscallFilename := fmt.Sprintf("syscall_%s.go", goos)
syscallArchFilename := fmt.Sprintf("syscall_%s_%s.go", goos, arch)
in1, err := os.ReadFile(syscallFilename)
if err != nil {
log.Fatalf("can't open syscall file: %s", err)
}
in2, err := os.ReadFile(syscallArchFilename)
if err != nil {
log.Fatalf("can't open syscall file: %s", err)
}
in3, err := os.ReadFile("z" + syscallArchFilename)
if err != nil {
log.Fatalf("can't open syscall file: %s", err)
}
in := string(in1) + string(in2) + string(in3)
trampolines := map[string]bool{}
var out bytes.Buffer
fmt.Fprintf(&out, "// go run mkasm.go %s\n", strings.Join(os.Args[1:], " "))
fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
fmt.Fprintf(&out, "#include \"textflag.h\"\n")
for _, line := range strings.Split(in, "\n") {
if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
continue
}
fn := line[5 : len(line)-13]
if !trampolines[fn] {
trampolines[fn] = true
fmt.Fprintf(&out, "TEXT ·%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
if goos == "openbsd" && arch == "ppc64" {
fmt.Fprintf(&out, "\tCALL\t%s(SB)\n", fn)
fmt.Fprintf(&out, "\tRET\n")
} else {
fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
}
}
}
err = os.WriteFile(fmt.Sprintf("zsyscall_%s_%s.s", goos, arch), out.Bytes(), 0644)
if err != nil {
log.Fatalf("can't write syscall file: %s", err)
}
}

462
src/syscall/mkerrors.sh Executable file
View File

@@ -0,0 +1,462 @@
#!/usr/bin/env bash
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# Generate Go code listing errors and other #defined constant
# values (ENAMETOOLONG etc.), by asking the preprocessor
# about the definitions.
unset LANG
export LC_ALL=C
export LC_CTYPE=C
CC=${CC:-gcc}
if [[ "$GOOS" -eq "solaris" ]]; then
# Assumes GNU versions of utilities in PATH.
export PATH=/usr/gnu/bin:$PATH
fi
uname=$(uname)
includes_AIX='
#include <net/if.h>
#include <net/netopt.h>
#include <netinet/ip_mroute.h>
#include <sys/mman.h>
#include <sys/protosw.h>
#include <sys/ptrace.h>
#include <sys/stropts.h>
#include <termios.h>
'
includes_Darwin='
#define _DARWIN_C_SOURCE
#define KERNEL
#define _DARWIN_USE_64_BIT_INODE
#include <sys/types.h>
#include <sys/event.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
#include <termios.h>
'
includes_DragonFly='
#include <sys/types.h>
#include <sys/event.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <termios.h>
#include <netinet/ip.h>
#include <net/ip_mroute/ip_mroute.h>
'
includes_FreeBSD='
#include <sys/param.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <termios.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
#if __FreeBSD__ >= 10
#define IFT_CARP 0xf8 // IFT_CARP is deprecated in FreeBSD 10
#undef SIOCAIFADDR
#define SIOCAIFADDR _IOW(105, 26, struct oifaliasreq) // ifaliasreq contains if_data
#undef SIOCSIFPHYADDR
#define SIOCSIFPHYADDR _IOW(105, 70, struct oifaliasreq) // ifaliasreq contains if_data
#endif
'
includes_Linux='
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#ifndef __LP64__
#define _FILE_OFFSET_BITS 64
#endif
#define _GNU_SOURCE
#include <bits/sockaddr.h>
#include <sys/epoll.h>
#include <sys/inotify.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/if_packet.h>
#include <linux/if_addr.h>
#include <linux/filter.h>
#include <linux/netlink.h>
#include <linux/reboot.h>
#include <linux/rtnetlink.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/wait.h>
#include <linux/icmpv6.h>
#include <net/route.h>
#include <termios.h>
#ifndef MSG_FASTOPEN
#define MSG_FASTOPEN 0x20000000
#endif
#ifndef PTRACE_GETREGS
#define PTRACE_GETREGS 0xc
#endif
#ifndef PTRACE_SETREGS
#define PTRACE_SETREGS 0xd
#endif
'
includes_NetBSD='
#include <sys/types.h>
#include <sys/param.h>
#include <sys/event.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/termios.h>
#include <sys/ttycom.h>
#include <sys/wait.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
#include <netinet/if_ether.h>
// Needed since <sys/param.h> refers to it...
#define schedppq 1
'
includes_OpenBSD='
#include <sys/types.h>
#include <sys/param.h>
#include <sys/event.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/termios.h>
#include <sys/ttycom.h>
#include <sys/wait.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
#include <netinet/if_ether.h>
#include <net/if_bridge.h>
// We keep some constants not supported in OpenBSD 5.5 and beyond for
// the promise of compatibility.
#define EMUL_ENABLED 0x1
#define EMUL_NATIVE 0x2
#define IPV6_FAITH 0x1d
#define IPV6_OPTIONS 0x1
#define IPV6_RTHDR_STRICT 0x1
#define IPV6_SOCKOPT_RESERVED1 0x3
#define SIOCGIFGENERIC 0xc020693a
#define SIOCSIFGENERIC 0x80206939
#define WALTSIG 0x4
'
includes_SunOS='
#include <limits.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <termios.h>
#include <netinet/ip.h>
#include <netinet/ip_mroute.h>
'
includes='
#include <sys/types.h>
#include <sys/file.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <sys/signal.h>
#include <signal.h>
#include <sys/resource.h>
'
ccflags="$@"
# Write go tool cgo -godefs input.
(
echo package syscall
echo
echo '/*'
indirect="includes_$(uname)"
echo "${!indirect} $includes"
echo '*/'
echo 'import "C"'
echo
echo 'const ('
# The gcc command line prints all the #defines
# it encounters while processing the input
echo "${!indirect} $includes" | $CC -x c - -E -dM $ccflags |
awk '
$1 != "#define" || $2 ~ /\(/ || $3 == "" {next}
$2 ~ /^E([ABCD]X|[BIS]P|[SD]I|S|FL)$/ {next} # 386 registers
$2 ~ /^(SIGEV_|SIGSTKSZ|SIGRT(MIN|MAX))/ {next}
$2 ~ /^(SCM_SRCRT)$/ {next}
$2 ~ /^(MAP_FAILED)$/ {next}
$2 ~ /^CLONE_[A-Z_]+/ {next} # These are defined in exec_linux.go.
$2 ~ /^ELF_.*$/ {next} # <asm/elf.h> contains ELF_ARCH, etc.
$2 !~ /^ETH_/ &&
$2 !~ /^EPROC_/ &&
$2 !~ /^EQUIV_/ &&
$2 !~ /^EXPR_/ &&
$2 ~ /^E[A-Z0-9_]+$/ ||
$2 ~ /^B[0-9_]+$/ ||
$2 ~ /^V[A-Z0-9]+$/ ||
$2 ~ /^CS[A-Z0-9]/ ||
$2 ~ /^I(SIG|CANON|CRNL|EXTEN|MAXBEL|STRIP|UTF8)$/ ||
$2 ~ /^IGN/ ||
$2 ~ /^IX(ON|ANY|OFF)$/ ||
$2 ~ /^IN(LCR|PCK)$/ ||
$2 ~ /(^FLU?SH)|(FLU?SH$)/ ||
$2 ~ /^C(LOCAL|READ)$/ ||
$2 == "BRKINT" ||
$2 == "HUPCL" ||
$2 == "PENDIN" ||
$2 == "TOSTOP" ||
$2 ~ /^PAR/ ||
$2 ~ /^SIG[^_]/ ||
$2 ~ /^O[CNPFP][A-Z]+[^_][A-Z]+$/ ||
$2 ~ /^IN_/ ||
$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
$2 == "ICMPV6_FILTER" ||
$2 == "SOMAXCONN" ||
$2 == "NAME_MAX" ||
$2 == "IFNAMSIZ" ||
$2 ~ /^CTL_(MAXNAME|NET|QUERY)$/ ||
$2 ~ /^SYSCTL_VERS/ ||
$2 ~ /^(MS|MNT)_/ ||
$2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
$2 ~ /^(O|F|FD|NAME|S|PTRACE|PT)_/ ||
$2 ~ /^LINUX_REBOOT_CMD_/ ||
$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
$2 !~ "NLA_TYPE_MASK" &&
$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
$2 ~ /^SIOC/ ||
$2 ~ /^TIOC/ ||
$2 !~ "RTF_BITS" &&
$2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
$2 ~ /^BIOC/ ||
$2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ ||
$2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ ||
$2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
$2 !~ /^(BPF_TIMEVAL)$/ &&
$2 ~ /^(BPF|DLT)_/ ||
$2 !~ "WMESGLEN" &&
$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
$2 ~ /^__WCOREFLAG$/ {next}
$2 ~ /^__W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", substr($2,3), $2)}
{next}
' | sort
echo ')'
) >_const.go
# Pull out the error names for later.
errors=$(
echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print $2 }' |
sort
)
# Pull out the signal names for later.
signals=$(
echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print $2 }' |
grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT' |
sort
)
# Again, writing regexps to a file.
echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print "^\t" $2 "[ \t]*=" }' |
sort >_error.grep
echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print "^\t" $2 "[ \t]*=" }' |
grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT' |
sort >_signal.grep
echo '// mkerrors.sh' "$@"
echo '// Code generated by the command above; DO NOT EDIT.'
echo
go tool cgo -godefs -- "$@" _const.go >_error.out
cat _error.out | grep -vf _error.grep | grep -vf _signal.grep
echo
echo '// Errors'
echo 'const ('
cat _error.out | grep -f _error.grep | sed 's/=\(.*\)/= Errno(\1)/'
echo ')'
echo
echo '// Signals'
echo 'const ('
cat _error.out | grep -f _signal.grep | sed 's/=\(.*\)/= Signal(\1)/'
echo ')'
# Run C program to print error and syscall strings.
(
echo -E "
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <signal.h>
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
enum { A = 'A', Z = 'Z', a = 'a', z = 'z' }; // avoid need for single quotes below
int errors[] = {
"
for i in $errors
do
echo -E ' '$i,
done
echo -E "
};
int signals[] = {
"
for i in $signals
do
echo -E ' '$i,
done
# Use -E because on some systems bash builtin interprets \n itself.
echo -E '
};
static int
intcmp(const void *a, const void *b)
{
return *(int*)a - *(int*)b;
}
int
main(void)
{
int i, j, e;
char buf[1024], *p;
printf("\n\n// Error table\n");
printf("var errors = [...]string {\n");
qsort(errors, nelem(errors), sizeof errors[0], intcmp);
for(i=0; i<nelem(errors); i++) {
e = errors[i];
if(i > 0 && errors[i-1] == e)
continue;
strcpy(buf, strerror(e));
// lowercase first letter: Bad -> bad, but STREAM -> STREAM.
if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
buf[0] += a - A;
printf("\t%d: \"%s\",\n", e, buf);
}
printf("}\n\n");
printf("\n\n// Signal table\n");
printf("var signals = [...]string {\n");
qsort(signals, nelem(signals), sizeof signals[0], intcmp);
for(i=0; i<nelem(signals); i++) {
e = signals[i];
if(i > 0 && signals[i-1] == e)
continue;
strcpy(buf, strsignal(e));
// lowercase first letter: Bad -> bad, but STREAM -> STREAM.
if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
buf[0] += a - A;
// cut trailing : number.
p = strrchr(buf, ":"[0]);
if(p)
*p = '\0';
printf("\t%d: \"%s\",\n", e, buf);
}
printf("}\n\n");
return 0;
}
'
) >_errors.c
$CC $ccflags -o _errors _errors.c && $GORUN ./_errors && rm -f _errors.c _errors _const.go _error.grep _signal.grep _error.out

82
src/syscall/mkpost.go Normal file
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@@ -0,0 +1,82 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// mkpost processes the output of cgo -godefs to
// modify the generated types. It is used to clean up
// the syscall API in an architecture specific manner.
//
// mkpost is run after cgo -godefs by mkall.sh.
package main
import (
"fmt"
"go/format"
"io"
"log"
"os"
"regexp"
"strings"
)
func main() {
b, err := io.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
s := string(b)
goarch := os.Getenv("GOARCH")
goos := os.Getenv("GOOS")
switch {
case goarch == "s390x" && goos == "linux":
// Export the types of PtraceRegs fields.
re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
s = re.ReplaceAllString(s, "Ptrace$1")
// Replace padding fields inserted by cgo with blank identifiers.
re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
s = re.ReplaceAllString(s, "_")
// We want to keep the X_ fields that are already consistently exported
// for the other linux GOARCH settings.
// Hide them and restore later.
s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
s = strings.Replace(s, "X__ifi_pad", "MKPOSTIFIPAD", 1)
s = strings.Replace(s, "X_f", "MKPOSTSYSINFOTF", 1)
// Replace other unwanted fields with blank identifiers.
re = regexp.MustCompile("X_[A-Za-z0-9_]*")
s = re.ReplaceAllString(s, "_")
// Restore preserved fields.
s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
s = strings.Replace(s, "MKPOSTIFIPAD", "X__ifi_pad", 1)
s = strings.Replace(s, "MKPOSTSYSINFOTF", "X_f", 1)
// Force the type of RawSockaddr.Data to [14]int8 to match
// the existing gccgo API.
re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
s = re.ReplaceAllString(s, "${1}int8")
case goos == "freebsd":
// Keep pre-FreeBSD 10 / non-POSIX 2008 names for timespec fields
re := regexp.MustCompile("(A|M|C|Birth)tim\\s+Timespec")
s = re.ReplaceAllString(s, "${1}timespec Timespec")
}
// gofmt
b, err = format.Source([]byte(s))
if err != nil {
log.Fatal(err)
}
// Append this command to the header to show where the new file
// came from.
re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
fmt.Print(s)
}

413
src/syscall/mksyscall.pl Executable file
View File

@@ -0,0 +1,413 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# This program reads a file containing function prototypes
# (like syscall_darwin.go) and generates system call bodies.
# The prototypes are marked by lines beginning with "//sys"
# and read like func declarations if //sys is replaced by func, but:
# * The parameter lists must give a name for each argument.
# This includes return parameters.
# * The parameter lists must give a type for each argument:
# the (x, y, z int) shorthand is not allowed.
# * If the return parameter is an error number, it must be named errno.
# A line beginning with //sysnb is like //sys, except that the
# goroutine will not be suspended during the execution of the system
# call. This must only be used for system calls which can never
# block, as otherwise the system call could cause all goroutines to
# hang.
use strict;
my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
my $errors = 0;
my $_32bit = "";
my $plan9 = 0;
my $darwin = 0;
my $openbsd = 0;
my $netbsd = 0;
my $dragonfly = 0;
my $arm = 0; # 64-bit value should use (even, odd)-pair
my $libc = 0;
my $tags = ""; # build tags
my $newtags = ""; # new style build tags
my $stdimports = 'import "unsafe"';
my $extraimports = "";
if($ARGV[0] eq "-b32") {
$_32bit = "big-endian";
shift;
} elsif($ARGV[0] eq "-l32") {
$_32bit = "little-endian";
shift;
}
if($ARGV[0] eq "-plan9") {
$plan9 = 1;
shift;
}
if($ARGV[0] eq "-darwin") {
$darwin = 1;
$libc = 1;
shift;
}
if($ARGV[0] eq "-openbsd") {
$openbsd = 1;
shift;
}
if($ARGV[0] eq "-netbsd") {
$netbsd = 1;
shift;
}
if($ARGV[0] eq "-dragonfly") {
$dragonfly = 1;
shift;
}
if($ARGV[0] eq "-arm") {
$arm = 1;
shift;
}
if($ARGV[0] eq "-libc") {
$libc = 1;
shift;
}
if($ARGV[0] eq "-tags") {
shift;
$tags = $ARGV[0];
shift;
}
if($ARGV[0] =~ /^-/) {
print STDERR "usage: mksyscall.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
exit 1;
}
if($libc) {
$extraimports = 'import "internal/abi"';
}
if($darwin) {
$extraimports .= "\nimport \"runtime\"";
}
sub parseparamlist($) {
my ($list) = @_;
$list =~ s/^\s*//;
$list =~ s/\s*$//;
if($list eq "") {
return ();
}
return split(/\s*,\s*/, $list);
}
sub parseparam($) {
my ($p) = @_;
if($p !~ /^(\S*) (\S*)$/) {
print STDERR "$ARGV:$.: malformed parameter: $p\n";
$errors = 1;
return ("xx", "int");
}
return ($1, $2);
}
# set of trampolines we've already generated
my %trampolines;
my $text = "";
while(<>) {
chomp;
s/\s+/ /g;
s/^\s+//;
s/\s+$//;
my $nonblock = /^\/\/sysnb /;
next if !/^\/\/sys / && !$nonblock;
# Line must be of the form
# func Open(path string, mode int, perm int) (fd int, errno error)
# Split into name, in params, out params.
if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*((?i)_?SYS_[A-Z0-9_]+))?$/) {
print STDERR "$ARGV:$.: malformed //sys declaration\n";
$errors = 1;
next;
}
my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);
# Split argument lists on comma.
my @in = parseparamlist($in);
my @out = parseparamlist($out);
# Try in vain to keep people from editing this file.
# The theory is that they jump into the middle of the file
# without reading the header.
$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
if ((($darwin || ($openbsd && $libc)) && $func =~ /^ptrace(Ptr)?$/)) {
# The ptrace function is called from forkAndExecInChild where stack
# growth is forbidden.
$text .= "//go:nosplit\n"
}
# Go function header.
my $out_decl = @out ? sprintf(" (%s)", join(', ', @out)) : "";
$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out_decl;
# Disable ptrace on iOS.
if ($darwin && $func =~ /^ptrace(Ptr)?$/) {
$text .= "\tif runtime.GOOS == \"ios\" {\n";
$text .= "\t\tpanic(\"unimplemented\")\n";
$text .= "\t}\n";
}
# Check if err return available
my $errvar = "";
foreach my $p (@out) {
my ($name, $type) = parseparam($p);
if($type eq "error") {
$errvar = $name;
last;
}
}
# Prepare arguments to Syscall.
my @args = ();
my $n = 0;
foreach my $p (@in) {
my ($name, $type) = parseparam($p);
if($type =~ /^\*/) {
push @args, "uintptr(unsafe.Pointer($name))";
} elsif($type eq "string" && $errvar ne "") {
$text .= "\tvar _p$n *byte\n";
$text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
push @args, "uintptr(unsafe.Pointer(_p$n))";
$n++;
} elsif($type eq "string") {
print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
$text .= "\tvar _p$n *byte\n";
$text .= "\t_p$n, _ = BytePtrFromString($name)\n";
push @args, "uintptr(unsafe.Pointer(_p$n))";
$n++;
} elsif($type =~ /^\[\](.*)/) {
# Convert slice into pointer, length.
# Have to be careful not to take address of &a[0] if len == 0:
# pass dummy pointer in that case.
# Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
$text .= "\tvar _p$n unsafe.Pointer\n";
$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
$text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
$text .= "\n";
push @args, "uintptr(_p$n)", "uintptr(len($name))";
$n++;
} elsif($type eq "int64" && ($openbsd || $netbsd)) {
if (!$libc) {
push @args, "0";
}
if($libc && $arm && @args % 2) {
# arm abi specifies 64 bit argument must be 64 bit aligned.
push @args, "0"
}
if($_32bit eq "big-endian") {
push @args, "uintptr($name>>32)", "uintptr($name)";
} elsif($_32bit eq "little-endian") {
push @args, "uintptr($name)", "uintptr($name>>32)";
} else {
push @args, "uintptr($name)";
}
} elsif($type eq "int64" && $dragonfly) {
if ($func !~ /^extp(read|write)/i) {
push @args, "0";
}
if($_32bit eq "big-endian") {
push @args, "uintptr($name>>32)", "uintptr($name)";
} elsif($_32bit eq "little-endian") {
push @args, "uintptr($name)", "uintptr($name>>32)";
} else {
push @args, "uintptr($name)";
}
} elsif($type eq "int64" && $_32bit ne "") {
if(@args % 2 && $arm) {
# arm abi specifies 64-bit argument uses
# (even, odd) pair
push @args, "0"
}
if($_32bit eq "big-endian") {
push @args, "uintptr($name>>32)", "uintptr($name)";
} else {
push @args, "uintptr($name)", "uintptr($name>>32)";
}
} else {
push @args, "uintptr($name)";
}
}
# Determine which form to use; pad args with zeros.
my $asm = "Syscall";
if ($nonblock) {
if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
$asm = "rawSyscallNoError";
} else {
$asm = "RawSyscall";
}
}
if ($libc) {
# Call unexported syscall functions (which take
# libc functions instead of syscall numbers).
$asm = lcfirst($asm);
}
if(@args <= 3) {
while(@args < 3) {
push @args, "0";
}
} elsif(@args <= 6) {
$asm .= "6";
while(@args < 6) {
push @args, "0";
}
} elsif(@args <= 9) {
$asm .= "9";
while(@args < 9) {
push @args, "0";
}
} else {
print STDERR "$ARGV:$.: too many arguments to system call\n";
}
if ($darwin || ($openbsd && $libc)) {
# Use extended versions for calls that generate a 64-bit result.
my ($name, $type) = parseparam($out[0]);
if ($type eq "int64" || ($type eq "uintptr" && $_32bit eq "")) {
$asm .= "X";
}
}
# System call number.
my $funcname = "";
if($sysname eq "") {
$sysname = "SYS_$func";
$sysname =~ s/([a-z])([A-Z])/${1}_$2/g; # turn FooBar into Foo_Bar
$sysname =~ y/a-z/A-Z/;
if($libc) {
$sysname =~ y/A-Z/a-z/;
$sysname = substr $sysname, 4;
$funcname = "libc_$sysname";
}
}
if($libc) {
if($funcname eq "") {
$sysname = substr $sysname, 4;
$sysname =~ y/A-Z/a-z/;
$funcname = "libc_$sysname";
}
$sysname = "abi.FuncPCABI0(${funcname}_trampoline)";
}
# Actual call.
my $args = join(', ', @args);
my $call = "$asm($sysname, $args)";
# Assign return values.
my $body = "";
my @ret = ("_", "_", "_");
my $do_errno = 0;
for(my $i=0; $i<@out; $i++) {
my $p = $out[$i];
my ($name, $type) = parseparam($p);
my $reg = "";
if($name eq "err" && !$plan9) {
$reg = "e1";
$ret[2] = $reg;
$do_errno = 1;
} elsif($name eq "err" && $plan9) {
$ret[0] = "r0";
$ret[2] = "e1";
next;
} else {
$reg = sprintf("r%d", $i);
$ret[$i] = $reg;
}
if($type eq "bool") {
$reg = "$reg != 0";
}
if($type eq "int64" && $_32bit ne "") {
# 64-bit number in r1:r0 or r0:r1.
if($i+2 > @out) {
print STDERR "$ARGV:$.: not enough registers for int64 return\n";
}
if($_32bit eq "big-endian") {
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
} else {
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
}
$ret[$i] = sprintf("r%d", $i);
$ret[$i+1] = sprintf("r%d", $i+1);
}
if($reg ne "e1" || $plan9) {
$body .= "\t$name = $type($reg)\n";
}
}
if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
$text .= "\t$call\n";
} else {
if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
# raw syscall without error on Linux, see golang.org/issue/22924
$text .= "\t$ret[0], $ret[1] := $call\n";
} else {
$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
}
}
$text .= $body;
if ($plan9 && $ret[2] eq "e1") {
$text .= "\tif int32(r0) == -1 {\n";
$text .= "\t\terr = e1\n";
$text .= "\t}\n";
} elsif ($do_errno) {
$text .= "\tif e1 != 0 {\n";
$text .= "\t\terr = errnoErr(e1)\n";
$text .= "\t}\n";
}
$text .= "\treturn\n";
$text .= "}\n\n";
if($libc) {
if (not exists $trampolines{$funcname}) {
$trampolines{$funcname} = 1;
# The assembly trampoline that jumps to the libc routine.
$text .= "func ${funcname}_trampoline()\n\n";
# Tell the linker that funcname can be found in libSystem using varname without the libc_ prefix.
my $basename = substr $funcname, 5;
my $libc = "libc.so";
if ($darwin) {
$libc = "/usr/lib/libSystem.B.dylib";
}
$text .= "//go:cgo_import_dynamic $funcname $basename \"$libc\"\n\n";
}
}
}
chomp $text;
chomp $text;
if($errors) {
exit 1;
}
if($extraimports ne "") {
$stdimports .= "\n$extraimports";
}
# TODO: this assumes tags are just simply comma separated. For now this is all the uses.
$newtags = $tags =~ s/,/ && /r;
print <<EOF;
// $cmdline
// Code generated by the command above; DO NOT EDIT.
//go:build $newtags
package syscall
$stdimports
$text
EOF
exit 0;

338
src/syscall/mksyscall_libc.pl Executable file
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@@ -0,0 +1,338 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# This program reads a file containing function prototypes
# (like syscall_solaris.go) and generates system call bodies.
# The prototypes are marked by lines beginning with "//sys"
# and read like func declarations if //sys is replaced by func, but:
# * The parameter lists must give a name for each argument.
# This includes return parameters.
# * The parameter lists must give a type for each argument:
# the (x, y, z int) shorthand is not allowed.
# * If the return parameter is an error number, it must be named err.
# * If go func name needs to be different than its libc name,
# * or the function is not in libc, name could be specified
# * at the end, after "=" sign, like
# //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
use strict;
my $cmdline = "mksyscall_libc.pl " . join(' ', @ARGV);
my $errors = 0;
my $_32bit = "";
my $tags = ""; # build tags
my $newtags = ""; # new style build tags
my $aix = 0;
my $solaris = 0;
binmode STDOUT;
if($ARGV[0] eq "-b32") {
$_32bit = "big-endian";
shift;
} elsif($ARGV[0] eq "-l32") {
$_32bit = "little-endian";
shift;
}
if($ARGV[0] eq "-aix") {
$aix = 1;
shift;
}
if($ARGV[0] eq "-solaris") {
$solaris = 1;
shift;
}
if($ARGV[0] eq "-tags") {
shift;
$tags = $ARGV[0];
shift;
}
if($ARGV[0] =~ /^-/) {
print STDERR "usage: mksyscall_libc.pl [-b32 | -l32] [-aix | -solaris] [-tags x,y] [file ...]\n";
exit 1;
}
sub parseparamlist($) {
my ($list) = @_;
$list =~ s/^\s*//;
$list =~ s/\s*$//;
if($list eq "") {
return ();
}
return split(/\s*,\s*/, $list);
}
sub parseparam($) {
my ($p) = @_;
if($p !~ /^(\S*) (\S*)$/) {
print STDERR "$ARGV:$.: malformed parameter: $p\n";
$errors = 1;
return ("xx", "int");
}
return ($1, $2);
}
my $package = "";
my $text = "";
my $dynimports = "";
my $linknames = "";
my @vars = ();
while(<>) {
chomp;
s/\s+/ /g;
s/^\s+//;
s/\s+$//;
$package = $1 if !$package && /^package (\S+)$/;
my $nonblock = /^\/\/sysnb /;
next if !/^\/\/sys / && !$nonblock;
my $syscalldot = "";
$syscalldot = "syscall." if $package ne "syscall";
# Line must be of the form
# func Open(path string, mode int, perm int) (fd int, err error)
# Split into name, in params, out params.
if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) {
print STDERR "$ARGV:$.: malformed //sys declaration\n";
$errors = 1;
next;
}
my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6);
# Split argument lists on comma.
my @in = parseparamlist($in);
my @out = parseparamlist($out);
# Try in vain to keep people from editing this file.
# The theory is that they jump into the middle of the file
# without reading the header.
$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
# So file name.
if($aix) {
if($modname eq "") {
$modname = "libc.a/shr_64.o";
} else {
print STDERR "$func: only syscall using libc are available\n";
$errors = 1;
next;
}
}
if($solaris) {
if($modname eq "") {
$modname = "libc";
}
$modname .= ".so";
}
# System call name.
if($sysname eq "") {
$sysname = "$func";
}
# System call pointer variable name.
my $sysvarname = "libc_${sysname}";
my $strconvfunc = "BytePtrFromString";
my $strconvtype = "*byte";
$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
# Runtime import of function to allow cross-platform builds.
if($dynimports !~ /\s+${sysvarname}\s+/) {
$dynimports .= "//go:cgo_import_dynamic ${sysvarname} ${sysname} \"$modname\"\n";
# Link symbol to proc address variable.
$linknames .= "//go:linkname ${sysvarname} ${sysvarname}\n";
# Library proc address variable.
push @vars, $sysvarname;
}
# Go function header.
$out = join(', ', @out);
if($out ne "") {
$out = " ($out)";
}
if($text ne "") {
$text .= "\n"
}
$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out;
# Check if err return available
my $errvar = "";
foreach my $p (@out) {
my ($name, $type) = parseparam($p);
if($type eq "error") {
$errvar = $name;
last;
}
}
# Prepare arguments to Syscall.
my @args = ();
my $n = 0;
foreach my $p (@in) {
my ($name, $type) = parseparam($p);
if($type =~ /^\*/) {
push @args, "uintptr(unsafe.Pointer($name))";
} elsif($type eq "string" && $errvar ne "") {
$text .= "\tvar _p$n $strconvtype\n";
$text .= "\t_p$n, $errvar = $strconvfunc($name)\n";
$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
push @args, "uintptr(unsafe.Pointer(_p$n))";
$n++;
} elsif($type eq "string") {
print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
$text .= "\tvar _p$n $strconvtype\n";
$text .= "\t_p$n, _ = $strconvfunc($name)\n";
push @args, "uintptr(unsafe.Pointer(_p$n))";
$n++;
} elsif($type =~ /^\[\](.*)/) {
# Convert slice into pointer, length.
# Have to be careful not to take address of &a[0] if len == 0:
# pass nil in that case.
$text .= "\tvar _p$n *$1\n";
$text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n";
push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))";
$n++;
} elsif($type eq "int64" && $_32bit ne "") {
if($_32bit eq "big-endian") {
push @args, "uintptr($name >> 32)", "uintptr($name)";
} else {
push @args, "uintptr($name)", "uintptr($name >> 32)";
}
} elsif($type eq "bool") {
$text .= "\tvar _p$n uint32\n";
$text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n";
push @args, "uintptr(_p$n)";
$n++;
} else {
push @args, "uintptr($name)";
}
}
my $nargs = @args;
my $asmfuncname="";
my $asmrawfuncname="";
if($aix){
$asmfuncname="syscall6";
$asmrawfuncname="rawSyscall6";
} else {
$asmfuncname="sysvicall6";
$asmrawfuncname="rawSysvicall6";
}
# Determine which form to use; pad args with zeros.
my $asm = "${syscalldot}${asmfuncname}";
if ($nonblock) {
$asm = "${syscalldot}${asmrawfuncname}";
}
if(@args <= 6) {
while(@args < 6) {
push @args, "0";
}
} else {
print STDERR "$ARGV:$.: too many arguments to system call\n";
}
# Actual call.
my $args = join(', ', @args);
my $call = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $args)";
# Assign return values.
my $body = "";
my $failexpr = "";
my @ret = ("_", "_", "_");
my @pout= ();
my $do_errno = 0;
for(my $i=0; $i<@out; $i++) {
my $p = $out[$i];
my ($name, $type) = parseparam($p);
my $reg = "";
if($name eq "err") {
$reg = "e1";
$ret[2] = $reg;
$do_errno = 1;
} else {
$reg = sprintf("r%d", $i);
$ret[$i] = $reg;
}
if($type eq "bool") {
$reg = "$reg != 0";
}
if($type eq "int64" && $_32bit ne "") {
# 64-bit number in r1:r0 or r0:r1.
if($i+2 > @out) {
print STDERR "$ARGV:$.: not enough registers for int64 return\n";
}
if($_32bit eq "big-endian") {
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
} else {
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
}
$ret[$i] = sprintf("r%d", $i);
$ret[$i+1] = sprintf("r%d", $i+1);
}
if($reg ne "e1") {
$body .= "\t$name = $type($reg)\n";
}
}
if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
$text .= "\t$call\n";
} else {
$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
}
$text .= $body;
if ($do_errno) {
$text .= "\tif e1 != 0 {\n";
$text .= "\t\terr = errnoErr(e1)\n";
$text .= "\t}\n";
}
$text .= "\treturn\n";
$text .= "}\n";
}
if($errors) {
exit 1;
}
# TODO: this assumes tags are just simply comma separated. For now this is all the uses.
$newtags = $tags =~ s/,/ && /r;
print <<EOF;
// $cmdline
// Code generated by the command above; DO NOT EDIT.
//go:build $newtags
package $package
import "unsafe"
EOF
print "import \"syscall\"\n" if $package ne "syscall";
my $vardecls = "\t" . join(",\n\t", @vars);
$vardecls .= " libcFunc";
chomp($_=<<EOF);
$dynimports
$linknames
type libcFunc uintptr
var (
$vardecls
)
$text
EOF
print $_;
exit 0;

60
src/syscall/mksyscall_windows.go Normal file
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@@ -0,0 +1,60 @@
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// mksyscall_windows wraps golang.org/x/sys/windows/mkwinsyscall.
package main
import (
"bytes"
"os"
"os/exec"
"path/filepath"
"runtime"
)
func main() {
goTool := filepath.Join(runtime.GOROOT(), "bin", "go")
listCmd := exec.Command(goTool, "list", "-m")
listCmd.Env = append(os.Environ(), "GO111MODULE=on")
var (
cmdEnv []string
modArgs []string
)
if out, err := listCmd.Output(); err == nil && string(bytes.TrimSpace(out)) == "std" {
// Force module mode to use mkwinsyscall at the same version as the x/sys
// module vendored into the standard library.
cmdEnv = append(os.Environ(), "GO111MODULE=on")
// Force -mod=readonly instead of the default -mod=vendor.
//
// mkwinsyscall is not itself vendored into the standard library, and it is
// not feasible to do so at the moment: std-vendored libraries are included
// in the "std" meta-pattern (because in general they *are* linked into
// users binaries separately from the original import paths), and we can't
// allow a binary in the "std" meta-pattern.
modArgs = []string{"-mod=readonly"}
} else {
// Nobody outside the standard library should be using this wrapper: other
// modules can vendor in the mkwinsyscall tool directly (as described in
// https://golang.org/issue/25922), so they don't need this wrapper to
// set module mode and -mod=readonly explicitly.
os.Stderr.WriteString("WARNING: Please switch from using:\n go run $GOROOT/src/syscall/mksyscall_windows.go\nto using:\n go run golang.org/x/sys/windows/mkwinsyscall\n")
}
args := append([]string{"run"}, modArgs...)
args = append(args, "golang.org/x/sys/windows/mkwinsyscall")
args = append(args, os.Args[1:]...)
cmd := exec.Command(goTool, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = cmdEnv
err := cmd.Run()
if err != nil {
os.Exit(1)
}
}

257
src/syscall/mksysctl_openbsd.pl Executable file
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#!/usr/bin/env perl
# Copyright 2011 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
#
# Parse the header files for OpenBSD and generate a Go usable sysctl MIB.
#
# Build a MIB with each entry being an array containing the level, type and
# a hash that will contain additional entries if the current entry is a node.
# We then walk this MIB and create a flattened sysctl name to OID hash.
#
use strict;
my $debug = 0;
my %ctls = ();
my @headers = qw (
sys/sysctl.h
sys/socket.h
sys/tty.h
sys/malloc.h
sys/mount.h
sys/namei.h
sys/sem.h
sys/shm.h
sys/vmmeter.h
uvm/uvm_param.h
uvm/uvm_swap_encrypt.h
ddb/db_var.h
net/if.h
net/if_pfsync.h
net/pipex.h
netinet/in.h
netinet/icmp_var.h
netinet/igmp_var.h
netinet/ip_ah.h
netinet/ip_carp.h
netinet/ip_divert.h
netinet/ip_esp.h
netinet/ip_ether.h
netinet/ip_gre.h
netinet/ip_ipcomp.h
netinet/ip_ipip.h
netinet/pim_var.h
netinet/tcp_var.h
netinet/udp_var.h
netinet6/in6.h
netinet6/ip6_divert.h
netinet6/pim6_var.h
netinet/icmp6.h
netmpls/mpls.h
);
my @ctls = qw (
kern
vm
fs
net
#debug # Special handling required
hw
#machdep # Arch specific
user
ddb
#vfs # Special handling required
fs.posix
kern.forkstat
kern.intrcnt
kern.malloc
kern.nchstats
kern.seminfo
kern.shminfo
kern.timecounter
kern.tty
kern.watchdog
net.bpf
net.ifq
net.inet
net.inet.ah
net.inet.carp
net.inet.divert
net.inet.esp
net.inet.etherip
net.inet.gre
net.inet.icmp
net.inet.igmp
net.inet.ip
net.inet.ip.ifq
net.inet.ipcomp
net.inet.ipip
net.inet.mobileip
net.inet.pfsync
net.inet.pim
net.inet.tcp
net.inet.udp
net.inet6
net.inet6.divert
net.inet6.ip6
net.inet6.icmp6
net.inet6.pim6
net.inet6.tcp6
net.inet6.udp6
net.mpls
net.mpls.ifq
net.key
net.pflow
net.pfsync
net.pipex
net.rt
vm.swapencrypt
#vfsgenctl # Special handling required
);
# Node name "fixups"
my %ctl_map = (
"ipproto" => "net.inet",
"net.inet.ipproto" => "net.inet",
"net.inet6.ipv6proto" => "net.inet6",
"net.inet6.ipv6" => "net.inet6.ip6",
"net.inet.icmpv6" => "net.inet6.icmp6",
"net.inet6.divert6" => "net.inet6.divert",
"net.inet6.tcp6" => "net.inet.tcp",
"net.inet6.udp6" => "net.inet.udp",
"mpls" => "net.mpls",
"swpenc" => "vm.swapencrypt"
);
# Node mappings
my %node_map = (
"net.inet.ip.ifq" => "net.ifq",
"net.inet.pfsync" => "net.pfsync",
"net.mpls.ifq" => "net.ifq"
);
my $ctlname;
my %mib = ();
my %sysctl = ();
my $node;
sub debug() {
print STDERR "$_[0]\n" if $debug;
}
# Walk the MIB and build a sysctl name to OID mapping.
sub build_sysctl() {
my ($node, $name, $oid) = @_;
my %node = %{$node};
my @oid = @{$oid};
foreach my $key (sort keys %node) {
my @node = @{$node{$key}};
my $nodename = $name.($name ne '' ? '.' : '').$key;
my @nodeoid = (@oid, $node[0]);
if ($node[1] eq 'CTLTYPE_NODE') {
if (exists $node_map{$nodename}) {
$node = \%mib;
$ctlname = $node_map{$nodename};
foreach my $part (split /\./, $ctlname) {
$node = \%{@{$$node{$part}}[2]};
}
} else {
$node = $node[2];
}
&build_sysctl($node, $nodename, \@nodeoid);
} elsif ($node[1] ne '') {
$sysctl{$nodename} = \@nodeoid;
}
}
}
foreach my $ctl (@ctls) {
$ctls{$ctl} = $ctl;
}
# Build MIB
foreach my $header (@headers) {
&debug("Processing $header...");
open HEADER, "/usr/include/$header" ||
print STDERR "Failed to open $header\n";
while (<HEADER>) {
if ($_ =~ /^#define\s+(CTL_NAMES)\s+{/ ||
$_ =~ /^#define\s+(CTL_(.*)_NAMES)\s+{/ ||
$_ =~ /^#define\s+((.*)CTL_NAMES)\s+{/) {
if ($1 eq 'CTL_NAMES') {
# Top level.
$node = \%mib;
} else {
# Node.
my $nodename = lc($2);
if ($header =~ /^netinet\//) {
$ctlname = "net.inet.$nodename";
} elsif ($header =~ /^netinet6\//) {
$ctlname = "net.inet6.$nodename";
} elsif ($header =~ /^net\//) {
$ctlname = "net.$nodename";
} else {
$ctlname = "$nodename";
$ctlname =~ s/^(fs|net|kern)_/$1\./;
}
if (exists $ctl_map{$ctlname}) {
$ctlname = $ctl_map{$ctlname};
}
if (not exists $ctls{$ctlname}) {
&debug("Ignoring $ctlname...");
next;
}
# Walk down from the top of the MIB.
$node = \%mib;
foreach my $part (split /\./, $ctlname) {
if (not exists $$node{$part}) {
&debug("Missing node $part");
$$node{$part} = [ 0, '', {} ];
}
$node = \%{@{$$node{$part}}[2]};
}
}
# Populate current node with entries.
my $i = -1;
while (defined($_) && $_ !~ /^}/) {
$_ = <HEADER>;
$i++ if $_ =~ /{.*}/;
next if $_ !~ /{\s+"(\w+)",\s+(CTLTYPE_[A-Z]+)\s+}/;
$$node{$1} = [ $i, $2, {} ];
}
}
}
close HEADER;
}
&build_sysctl(\%mib, "", []);
print <<EOF;
// mksysctl_openbsd.pl
// Code generated by the command above; DO NOT EDIT.
package syscall;
type mibentry struct {
ctlname string
ctloid []_C_int
}
var sysctlMib = []mibentry {
EOF
foreach my $name (sort keys %sysctl) {
my @oid = @{$sysctl{$name}};
print "\t{ \"$name\", []_C_int{ ", join(', ', @oid), " } }, \n";
}
print <<EOF;
}
EOF

43
src/syscall/mksysnum_dragonfly.pl Executable file
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@@ -0,0 +1,43 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
#
# Generate system call table for DragonFly from master list
# (for example, /usr/src/sys/kern/syscalls.master).
use strict;
my $command = "mksysnum_dragonfly.pl " . join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package syscall
const (
EOF
while(<>){
if(/^([0-9]+)\s+STD\s+({ \S+\s+(\w+).*)$/){
my $num = $1;
my $proto = $2;
my $name = "SYS_$3";
$name =~ y/a-z/A-Z/;
# There are multiple entries for enosys and nosys, so comment them out.
if($name =~ /^SYS_E?NOSYS$/){
$name = "// $name";
}
if($name eq 'SYS_SYS_EXIT'){
$name = 'SYS_EXIT';
}
print " $name = $num; // $proto\n";
}
}
print <<EOF;
)
EOF

56
src/syscall/mksysnum_freebsd.pl Executable file
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@@ -0,0 +1,56 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
#
# Generate system call table for FreeBSD from master list
# (for example, /usr/src/sys/kern/syscalls.master).
use strict;
my $command = "mksysnum_freebsd.pl " . join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package syscall
const (
EOF
while(<>){
if(/^([0-9]+)\s+\S+\s+STD\s+({ \S+\s+(\w+).*)$/){
my $num = $1;
my $proto = $2;
my $name = "SYS_$3";
$name =~ y/a-z/A-Z/;
# There are multiple entries for enosys and nosys, so comment them out.
if($name =~ /^SYS_E?NOSYS$/){
$name = "// $name";
}
if($name eq 'SYS_SYS_EXIT'){
$name = 'SYS_EXIT';
}
if($name =~ /^SYS_CAP_+/ || $name =~ /^SYS___CAP_+/){
next
}
print " $name = $num; // $proto\n";
# We keep Capsicum syscall numbers for FreeBSD
# 9-STABLE here because we are not sure whether they
# are mature and stable.
if($num == 513){
print " SYS_CAP_NEW = 514 // { int cap_new(int fd, uint64_t rights); }\n";
print " SYS_CAP_GETRIGHTS = 515 // { int cap_getrights(int fd, \\\n";
print " SYS_CAP_ENTER = 516 // { int cap_enter(void); }\n";
print " SYS_CAP_GETMODE = 517 // { int cap_getmode(u_int *modep); }\n";
}
}
}
print <<EOF;
)
EOF

61
src/syscall/mksysnum_linux.pl Executable file
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@@ -0,0 +1,61 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
use strict;
my $command = "mksysnum_linux.pl ". join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package syscall
const(
EOF
my $offset = 0;
sub fmt {
my ($name, $num) = @_;
if($num > 999){
# ignore deprecated syscalls that are no longer implemented
# https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
return;
}
$name =~ y/a-z/A-Z/;
$num = $num + $offset;
print " SYS_$name = $num;\n";
}
my $prev;
open(GCC, "gcc -E -dD $ARGV[0] |") || die "can't run gcc";
while(<GCC>){
if(/^#define __NR_Linux\s+([0-9]+)/){
# mips/mips64: extract offset
$offset = $1;
}
elsif(/^#define __NR_syscalls\s+/) {
# ignore redefinitions of __NR_syscalls
}
elsif(/^#define __NR_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR3264_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)/){
fmt($1, $prev+$2)
}
elsif(/^#define __NR_(\w+)\s+\(__NR_Linux \+ ([0-9]+)/){
fmt($1, $2);
}
}
print <<EOF;
)
EOF

51
src/syscall/mksysnum_netbsd.pl Executable file
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@@ -0,0 +1,51 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
#
# Generate system call table for OpenBSD from master list
# (for example, /usr/src/sys/kern/syscalls.master).
use strict;
my $command = "mksysnum_netbsd.pl " . join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package syscall
const (
EOF
my $line = '';
while(<>){
if($line =~ /^(.*)\\$/) {
# Handle continuation
$line = $1;
$_ =~ s/^\s+//;
$line .= $_;
} else {
# New line
$line = $_;
}
next if $line =~ /\\$/;
if($line =~ /^([0-9]+)\s+((STD)|(NOERR))\s+(RUMP\s+)?({\s+\S+\s*\*?\s*\|(\S+)\|(\S*)\|(\w+).*\s+})(\s+(\S+))?$/) {
my $num = $1;
my $proto = $6;
my $compat = $8;
my $name = "$7_$9";
$name = "$7_$11" if $11 ne '';
$name =~ y/a-z/A-Z/;
if($compat eq '' || $compat eq '30' || $compat eq '50') {
print " $name = $num; // $proto\n";
}
}
}
print <<EOF;
)
EOF

43
src/syscall/mksysnum_openbsd.pl Executable file
View File

@@ -0,0 +1,43 @@
#!/usr/bin/env perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
#
# Generate system call table for OpenBSD from master list
# (for example, /usr/src/sys/kern/syscalls.master).
use strict;
my $command = "mksysnum_openbsd.pl " . join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; DO NOT EDIT.
package syscall
const (
EOF
while(<>){
if(/^([0-9]+)\s+STD\s+(NOLOCK\s+)?(\{ \S+\s+\*?(\w+).*)$/){
my $num = $1;
my $proto = $3;
my $name = $4;
$name =~ y/a-z/A-Z/;
# There are multiple entries for enosys and nosys, so comment them out.
if($name =~ /^SYS_E?NOSYS$/){
$name = "// $name";
}
if($name eq 'SYS_SYS_EXIT'){
$name = 'SYS_EXIT';
}
print " $name = $num; // $proto\n";
}
}
print <<EOF;
)
EOF

23
src/syscall/mksysnum_plan9.sh Executable file
View File

@@ -0,0 +1,23 @@
#!/bin/sh
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
COMMAND="mksysnum_plan9.sh $@"
cat <<EOF
// $COMMAND
// Code generated by the command above; DO NOT EDIT.
package syscall
const(
EOF
SP='[ ]' # space or tab
sed "s/^#define${SP}\\([A-Z0-9_][A-Z0-9_]*\\)${SP}${SP}*\\([0-9][0-9]*\\)/SYS_\\1=\\2/g" \
< $1 | grep -v SYS__
cat <<EOF
)
EOF

22
src/syscall/mmap_unix_test.go Normal file
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@@ -0,0 +1,22 @@
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package syscall_test
import (
"syscall"
"testing"
)
func TestMmap(t *testing.T) {
b, err := syscall.Mmap(-1, 0, syscall.Getpagesize(), syscall.PROT_NONE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
if err != nil {
t.Fatalf("Mmap: %v", err)
}
if err := syscall.Munmap(b); err != nil {
t.Fatalf("Munmap: %v", err)
}
}

34
src/syscall/net.go Normal file
View File

@@ -0,0 +1,34 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
// A RawConn is a raw network connection.
type RawConn interface {
// Control invokes f on the underlying connection's file
// descriptor or handle.
// The file descriptor fd is guaranteed to remain valid while
// f executes but not after f returns.
Control(f func(fd uintptr)) error
// Read invokes f on the underlying connection's file
// descriptor or handle; f is expected to try to read from the
// file descriptor.
// If f returns true, Read returns. Otherwise Read blocks
// waiting for the connection to be ready for reading and
// tries again repeatedly.
// The file descriptor is guaranteed to remain valid while f
// executes but not after f returns.
Read(f func(fd uintptr) (done bool)) error
// Write is like Read but for writing.
Write(f func(fd uintptr) (done bool)) error
}
// Conn is implemented by some types in the net and os packages to provide
// access to the underlying file descriptor or handle.
type Conn interface {
// SyscallConn returns a raw network connection.
SyscallConn() (RawConn, error)
}

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