| // Copyright 2018 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. |
| |
| // +build darwin dragonfly freebsd linux netbsd openbsd solaris |
| |
| package unix |
| |
| import ( |
| "syscall" |
| _ "unsafe" // for go:linkname |
| ) |
| |
| //go:linkname syscall_fcntl syscall.fcntl |
| func syscall_fcntl(fd int, cmd int, arg int) (val int, err error) |
| |
| func IsNonblock(fd int) (nonblocking bool, err error) { |
| flag, err := syscall_fcntl(fd, syscall.F_GETFL, 0) |
| if err != nil { |
| return false, err |
| } |
| return flag&syscall.O_NONBLOCK != 0, nil |
| } |
