patch: fmt, os, runtime, syscall, time

internal/lib/syscall/syscall.go

@@ -24,17 +24,13 @@ import (
 	"github.com/goplus/llgo/c/os"
 )
 
-func errnoErr(errno c.Int) error {
-	panic("todo")
-}
-
 func Getcwd(buf []byte) (n int, err error) {
 	ptr := unsafe.Pointer(unsafe.SliceData(buf))
 	ret := os.Getcwd(ptr, uintptr(len(buf)))
 	if ret != nil {
 		return int(c.Strlen(ret)), nil
 	}
-	return 0, errnoErr(os.Errno)
+	return 0, Errno(os.Errno)
 }
 
 func Getwd() (string, error) {
@@ -42,5 +38,57 @@ func Getwd() (string, error) {
 	if wd != nil {
 		return c.GoString(wd), nil
 	}
-	return "", errnoErr(os.Errno)
+	return "", Errno(os.Errno)
+}
+
+func Getenv(key string) (value string, found bool) {
+	ret := os.Getenv(c.AllocaCStr(key))
+	if ret != nil {
+		return c.GoString(ret), true
+	}
+	return "", false
+}
+
+func Getpid() (pid int) {
+	return int(os.Getpid())
+}
+
+func Kill(pid int, signum Signal) (err error) {
+	ret := os.Kill(c.Int(pid), c.Int(signum))
+	if ret == 0 {
+		return nil
+	}
+	return Errno(os.Errno)
+}
+
+func Open(path string, mode int, perm uint32) (fd int, err error) {
+	ret := os.Open(c.AllocaCStr(path), c.Int(mode), os.ModeT(perm))
+	if ret >= 0 {
+		return int(ret), nil
+	}
+	return 0, Errno(os.Errno)
+}
+
+func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
+	ret := os.Lseek(c.Int(fd), os.OffT(offset), c.Int(whence))
+	if ret >= 0 {
+		return int64(ret), nil
+	}
+	return -1, Errno(os.Errno)
+}
+
+func Read(fd int, p []byte) (n int, err error) {
+	ret := os.Read(c.Int(fd), unsafe.Pointer(unsafe.SliceData(p)), uintptr(len(p)))
+	if ret >= 0 {
+		return ret, nil // TODO(xsw): confirm err == nil (not io.EOF) when ret == 0
+	}
+	return 0, Errno(os.Errno)
+}
+
+func Close(fd int) (err error) {
+	ret := os.Close(c.Int(fd))
+	if ret == 0 {
+		return nil
+	}
+	return Errno(os.Errno)
 }