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Source file src/os/pipe_freebsd.go

Documentation: os

  // Copyright 2017 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package os
  
  import "syscall"
  
  // Pipe returns a connected pair of Files; reads from r return bytes written to w.
  // It returns the files and an error, if any.
  func Pipe() (r *File, w *File, err error) {
  	var p [2]int
  
  	e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
  	if e != nil {
  		// Fallback support for FreeBSD 9, which lacks Pipe2.
  		//
  		// TODO: remove this for Go 1.10 when FreeBSD 9
  		// is removed (Issue 19072).
  
  		// See ../syscall/exec.go for description of lock.
  		syscall.ForkLock.RLock()
  		e := syscall.Pipe(p[0:])
  		if e != nil {
  			syscall.ForkLock.RUnlock()
  			return nil, nil, NewSyscallError("pipe", e)
  		}
  		syscall.CloseOnExec(p[0])
  		syscall.CloseOnExec(p[1])
  		syscall.ForkLock.RUnlock()
  	}
  
  	return newFile(uintptr(p[0]), "|0", true), newFile(uintptr(p[1]), "|1", true), nil
  }
  

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