blob: ea6622cd260de1c4811774b8560ff957ccda283a [file] [log] [blame]
// 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
}