libgo/go/os/sys_freebsd.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         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 }