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	// Seems like kern.osreldate is veiled on latest OS X. We use
15	// kern.osrelease instead.
16	osver, err := syscall.Sysctl("kern.osrelease")
17	if err != nil {
18		return
19	}
20	var i int
21	for i = range osver {
22		if osver[i] != '.' {
23			continue
24		}
25	}
26	// The O_CLOEXEC flag was introduced in OS X 10.7 (Darwin
27	// 11.0.0). See http://support.apple.com/kb/HT1633.
28	if i > 2 || i == 2 && osver[0] >= '1' && osver[1] >= '1' {
29		supportsCloseOnExec = true
30	}
31}
32