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// 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
}
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