blob: 9b39bb240878b2165711f54b052675f8acf4db37 [file] [log] [blame]
// 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 dragonfly freebsd linux netbsd openbsd
package unix
import "syscall"
//extern __go_fcntl_uintptr
func fcntl(uintptr, uintptr, uintptr) (uintptr, uintptr)
func IsNonblock(fd int) (nonblocking bool, err error) {
flag, e1 := fcntl(uintptr(fd), syscall.F_GETFL, 0)
if e1 != 0 {
return false, syscall.Errno(e1)
return flag&syscall.O_NONBLOCK != 0, nil