// Copyright 2013 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) // pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it // might not be implemented. if e == syscall.ENOSYS { // 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() } else if e != nil { return nil, nil, NewSyscallError("pipe2", e) } return newFile(uintptr(p[0]), "|0", kindPipe), newFile(uintptr(p[1]), "|1", kindPipe), nil }