1 // Copyright 2018 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build aix dragonfly freebsd linux netbsd openbsd solaris 6 7 package unix 8 9 import "syscall" 10 11 func IsNonblock(fd int) (nonblocking bool, err error) { 12 flag, _, e1 := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), uintptr(syscall.F_GETFL), 0) 13 if e1 != 0 { 14 return false, e1 15 } 16 return flag&syscall.O_NONBLOCK != 0, nil 17 } 18