| // 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 unix |
| |
| import ( |
| "syscall" |
| _ "unsafe" // for go:linkname |
| ) |
| |
| // Implemented in the runtime package. |
| // |
| //go:linkname fcntl runtime.fcntl |
| func fcntl(fd int32, cmd int32, arg int32) (int32, int32) |
| |
| func Fcntl(fd int, cmd int, arg int) (int, error) { |
| val, errno := fcntl(int32(fd), int32(cmd), int32(arg)) |
| if val == -1 { |
| return int(val), syscall.Errno(errno) |
| } |
| return int(val), nil |
| } |