libgo/go/os/pipe_bsd.go

   1 // Copyright 2009 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 // +build darwin dragonfly freebsd netbsd openbsd
   6
   7 package os
   8
   9 import "syscall"
  10
  11 // Pipe returns a connected pair of Files; reads from r return bytes written to w.
  12 // It returns the files and an error, if any.
  13 func Pipe() (r *File, w *File, err error) {
  14         var p [2]int
  15
  16         // See ../syscall/exec.go for description of lock.
  17         syscall.ForkLock.RLock()
  18         e := syscall.Pipe(p[0:])
  19         if e != nil {
  20                 syscall.ForkLock.RUnlock()
  21                 return nil, nil, NewSyscallError("pipe", e)
  22         }
  23         syscall.CloseOnExec(p[0])
  24         syscall.CloseOnExec(p[1])
  25         syscall.ForkLock.RUnlock()
  26
  27         return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
  28 }