libgo/go/os/pipe_glibc.go

   1 // Copyright 2013 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 hurd linux
   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         e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
  17         // pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
  18         // might not be implemented.
  19         if e == syscall.ENOSYS {
  20                 // See ../syscall/exec.go for description of lock.
  21                 syscall.ForkLock.RLock()
  22                 e = syscall.Pipe(p[0:])
  23                 if e != nil {
  24                         syscall.ForkLock.RUnlock()
  25                         return nil, nil, NewSyscallError("pipe", e)
  26                 }
  27                 syscall.CloseOnExec(p[0])
  28                 syscall.CloseOnExec(p[1])
  29                 syscall.ForkLock.RUnlock()
  30         } else if e != nil {
  31                 return nil, nil, NewSyscallError("pipe2", e)
  32         }
  33
  34         return newFile(uintptr(p[0]), "|0", kindPipe), newFile(uintptr(p[1]), "|1", kindPipe), nil
  35 }