libgo/go/os/sys_darwin.go

   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
   5 package os
   6
   7 import "syscall"
   8
   9 // supportsCloseOnExec reports whether the platform supports the
  10 // O_CLOEXEC flag.
  11 var supportsCloseOnExec bool
  12
  13 func 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 }