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Source file src/os/pipe_linux.go

     1	// Copyright 2013 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package os
     6	
     7	import "syscall"
     8	
     9	// Pipe returns a connected pair of Files; reads from r return bytes written to w.
    10	// It returns the files and an error, if any.
    11	func Pipe() (r *File, w *File, err error) {
    12		var p [2]int
    13	
    14		e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
    15		// pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
    16		// might not be implemented.
    17		if e == syscall.ENOSYS {
    18			// See ../syscall/exec.go for description of lock.
    19			syscall.ForkLock.RLock()
    20			e = syscall.Pipe(p[0:])
    21			if e != nil {
    22				syscall.ForkLock.RUnlock()
    23				return nil, nil, NewSyscallError("pipe", e)
    24			}
    25			syscall.CloseOnExec(p[0])
    26			syscall.CloseOnExec(p[1])
    27			syscall.ForkLock.RUnlock()
    28		} else if e != nil {
    29			return nil, nil, NewSyscallError("pipe2", e)
    30		}
    31	
    32		return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
    33	}
    34	

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