gistit

package main

import (
	"fmt"
	"io/ioutil"
	"net"
	"os"
	"path/filepath"
)

func test(tmp string) error {
	sockFile := filepath.Join(tmp, "unix.sock")
	l, err := net.Listen("unix", sockFile)
	if err != nil {
		return err
	}

	// check that there is sock file after listen
	if _, err := os.Stat(sockFile); err != nil {
		return fmt.Errorf("file %s is not found", sockFile)
	}

	if err := l.Close(); err != nil {
		return fmt.Errorf("first close %v", err)
	}

	// check that there is no sock file after close
	if _, err := os.Stat(sockFile); err == nil {
		return fmt.Errorf("file %s is found", sockFile)
	}

	l2, err := net.Listen("unix", sockFile)
	if err != nil {
		return err
	}
	defer l2.Close()

	// close old listener again
	l.Close()

	// new unix-socket deleted
	if _, err := os.Stat(sockFile); err != nil {
		return fmt.Errorf("file %s is not found", sockFile)
	}
	return nil
}

func main() {
	tmp, err := ioutil.TempDir("", "test-unix-sock-")
	if err != nil {
		panic(err)
	}
	defer os.RemoveAll(tmp)
	if err := test(tmp); err != nil {
		panic(err)
	}
}