1// Copyright 2014 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
5package os
6
7import "syscall"
8
9// supportsCloseOnExec reports whether the platform supports the
10// O_CLOEXEC flag.
11var supportsCloseOnExec bool
12
13func init() {
14	osrel, err := syscall.SysctlUint32("kern.osreldate")
15	if err != nil {
16		return
17	}
18	// The O_CLOEXEC flag was introduced in FreeBSD 8.3.
19	// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
20	if osrel >= 803000 {
21		supportsCloseOnExec = true
22	}
23}
24