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// 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
}
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