| // 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. |
| |
| //go:build dragonfly || freebsd || linux || netbsd || openbsd |
| |
| package net |
| |
| import ( |
| "syscall" |
| ) |
| |
| // Use a helper function to call fcntl. This is defined in C in |
| // libgo/runtime. |
| //extern __go_fcntl_uintptr |
| func libc_fcntl(uintptr, uintptr, uintptr) (uintptr, uintptr) |
| |
| func fcntl(fd int, cmd int, arg int) (int, error) { |
| syscall.Entersyscall() |
| r, e := libc_fcntl(uintptr(fd), uintptr(cmd), uintptr(arg)) |
| syscall.Exitsyscall() |
| if e != 0 { |
| return int(r), syscall.Errno(e) |
| } |
| return int(r), nil |
| } |