fix: linux-386 support

Author: ssgreg

write_msg.go

@@ -6,6 +6,8 @@ import (
 	"net"
 	"syscall"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 // Go implementation of sendmsg (UnixConn.WriteMsgUnix) is not suitable
@@ -39,9 +41,10 @@ func writeMsgUnix(c *net.UnixConn, oob []byte, addr *net.UnixAddr) (oobn int, er
 	}
 	defer f.Close()
 
-	_, n, errno := syscall.Syscall(syscall.SYS_SENDMSG, f.Fd(), uintptr(unsafe.Pointer(&msg)), 0)
+	_, n, errno := syscall.Syscall(unix.SYS_SENDMSG, f.Fd(), uintptr(unsafe.Pointer(&msg)), 0)
 	if errno != 0 {
 		return int(n), errno
 	}
+
 	return int(n), nil
 }

write_msg_go1.9.go

@@ -6,6 +6,8 @@ import (
 	"net"
 	"syscall"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 // Check function description in write_msg.go
@@ -26,13 +28,14 @@ func writeMsgUnix(c *net.UnixConn, oob []byte, addr *net.UnixAddr) (oobn int, er
 	var n uintptr
 	var errno syscall.Errno
 	err = rawConn.Write(func(fd uintptr) bool {
-		_, n, errno = syscall.Syscall(syscall.SYS_SENDMSG, fd, uintptr(unsafe.Pointer(&msg)), 0)
+		_, n, errno = syscall.Syscall(unix.SYS_SENDMSG, fd, uintptr(unsafe.Pointer(&msg)), 0)
 		return true
 	})
 	if err == nil {
 		if errno != 0 {
 			err = errno
 		}
 	}
+
 	return int(n), err
 }