// 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 

// FcntlSyscall is the number for the fcntl system call. This is
// usually SYS_FCNTL, but can be overridden to SYS_FCNTL64.
var FcntlSyscall uintptr = syscall.SYS_FCNTL

func ( int) ( bool,  error) {
	, ,  := syscall.Syscall(FcntlSyscall, uintptr(), uintptr(syscall.F_GETFL), 0)
	if  != 0 {
		return false, 
	}
	return &syscall.O_NONBLOCK != 0, nil
}