weirdness.go

package main

import (
	"crypto/rand"
	"io"
	"log"
	"net"
	"os"
	"os/exec"
)

func main() {
	// We need some randomness
	bs := make([]byte, 8)
	_, err := io.ReadFull(rand.Reader, bs)
	if err != nil {
		log.Println("random:", err)
	} else {
		log.Printf("Random bytes: % x", bs)
	}

	// We need to listen on a port
	conn, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		log.Println("listen:", err)
	} else {
		log.Println("Listening on", conn.Addr())
	}

	if os.Getenv("ISCHILD") == "" {
		log.Println("Trying once more as child")

		cmd := exec.Command("./weirdness")
		cmd.Stdout = os.Stdout
		cmd.Stdin = os.Stdin
		cmd.Stderr = os.Stderr
		cmd.Env = []string{"ISCHILD=yes"}
		err := cmd.Run()
		if err != nil {
			log.Fatal("run:", err)
		}
	}
}