github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/go/os/pipe_glibc.go (about) 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 // +build hurd linux 6 7 package os 8 9 import "syscall" 10 11 // Pipe returns a connected pair of Files; reads from r return bytes written to w. 12 // It returns the files and an error, if any. 13 func Pipe() (r *File, w *File, err error) { 14 var p [2]int 15 16 e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC) 17 // pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it 18 // might not be implemented. 19 if e == syscall.ENOSYS { 20 // See ../syscall/exec.go for description of lock. 21 syscall.ForkLock.RLock() 22 e = syscall.Pipe(p[0:]) 23 if e != nil { 24 syscall.ForkLock.RUnlock() 25 return nil, nil, NewSyscallError("pipe", e) 26 } 27 syscall.CloseOnExec(p[0]) 28 syscall.CloseOnExec(p[1]) 29 syscall.ForkLock.RUnlock() 30 } else if e != nil { 31 return nil, nil, NewSyscallError("pipe2", e) 32 } 33 34 return newFile(uintptr(p[0]), "|0", kindPipe), newFile(uintptr(p[1]), "|1", kindPipe), nil 35 }