Update to go1.23.3

src/internal/poll/sendfile_bsd.go

@@ -32,28 +32,46 @@ func SendFile(dstFD *FD, src int, pos, remain int64) (written int64, err error,
 		if int64(n) > remain {
 			n = int(remain)
 		}
+		m := n
 		pos1 := pos
 		n, err = syscall.Sendfile(dst, src, &pos1, n)
 		if n > 0 {
 			pos += int64(n)
 			written += int64(n)
 			remain -= int64(n)
+			// (n, nil) indicates that sendfile(2) has transferred
+			// the exact number of bytes we requested, or some unretryable
+			// error have occurred with partial bytes sent. Either way, we
+			// don't need to go through the following logic to check EINTR
+			// or fell into dstFD.pd.waitWrite, just continue to send the
+			// next chunk or break the loop.
+			if n == m {
+				continue
+			} else if err != syscall.EAGAIN &&
+				err != syscall.EINTR &&
+				err != syscall.EBUSY {
+				// Particularly, EPIPE. Errors like that would normally lead
+				// the subsequent sendfile(2) call to (-1, EBADF).
+				break
+			}
+		} else if err != syscall.EAGAIN && err != syscall.EINTR {
+			// This includes syscall.ENOSYS (no kernel
+			// support) and syscall.EINVAL (fd types which
+			// don't implement sendfile), and other errors.
+			// We should end the loop when there is no error
+			// returned from sendfile(2) or it is not a retryable error.
+			break
 		}
 		if err == syscall.EINTR {
 			continue
 		}
-		// This includes syscall.ENOSYS (no kernel
-		// support) and syscall.EINVAL (fd types which
-		// don't implement sendfile), and other errors.
-		// We should end the loop when there is no error
-		// returned from sendfile(2) or it is not a retryable error.
-		if err != syscall.EAGAIN {
-			break
-		}
 		if err = dstFD.pd.waitWrite(dstFD.isFile); err != nil {
 			break
 		}
 	}
+	if err == syscall.EAGAIN {
+		err = nil
+	}
 	handled = written != 0 || (err != syscall.ENOSYS && err != syscall.EINVAL)
 	return
 }