named_pipe.go

package main

import (
	"os"
	"syscall"
	"time"
)

func pipe(path string) (*os.File, *os.File, error) {
	syscall.ForkLock.RLock()
	defer syscall.ForkLock.RUnlock()

	if _, err := os.Stat(path); err != nil {
		if !os.IsNotExist(err) {
			return nil, nil, err
		} else {
			if err := syscall.Mkfifo(path, 0666); err != nil {
				return nil, nil, err
			}
		}
	}

	reader, err := os.OpenFile(path, syscall.O_NONBLOCK|os.O_RDONLY, 0666)
	if err != nil {
		return nil, nil, err
	}

	writer, err := os.OpenFile(path, syscall.O_NONBLOCK|os.O_WRONLY, 0666)
	if err != nil {
		return nil, nil, err
	}

	syscall.CloseOnExec(int(reader.Fd()))
	syscall.CloseOnExec(int(writer.Fd()))
	return reader, writer, nil
}

func main() {
	println("pipe")

	r, w, err := pipe("/tmp/fifo_wsd")
	if err != nil {
		panic(err)
	}

	defer r.Close()
	defer w.Close()
	println("Sleeping")
	time.Sleep(60 * time.Second)
}