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34 lines
990 B
Go
34 lines
990 B
Go
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import "syscall"
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// Pipe returns a connected pair of Files; reads from r return bytes written to w.
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// It returns the files and an error, if any.
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func Pipe() (r *File, w *File, err error) {
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var p [2]int
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e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
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// pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
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// might not be implemented.
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if e == syscall.ENOSYS {
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// See ../syscall/exec.go for description of lock.
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syscall.ForkLock.RLock()
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e = syscall.Pipe(p[0:])
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if e != nil {
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syscall.ForkLock.RUnlock()
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return nil, nil, NewSyscallError("pipe", e)
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}
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syscall.CloseOnExec(p[0])
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syscall.CloseOnExec(p[1])
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syscall.ForkLock.RUnlock()
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} else if e != nil {
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return nil, nil, NewSyscallError("pipe2", e)
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}
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return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
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}
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