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Source file src/os/pipe_linux.go

Documentation: os

     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", kindPipe), newFile(uintptr(p[1]), "|1", kindPipe), nil
    33  }
    34  

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