abuse.go

package main

import (
	"github.com/coreos/go-systemd/activation"

	"context"
	"fmt"
	"net/http"
	"os"
	"sync/atomic"
)

var stopCh = make(chan struct{})
var n uint64
var pid = os.Getpid()

func HelloServer(w http.ResponseWriter, req *http.Request) {
	m := atomic.AddUint64(&n, 1)
	fmt.Fprintln(w, pid, m, req.URL.Path)
	fmt.Println(pid, m, req.URL.Path)
	if m == 1 {
		close(stopCh)
	}
}

func main() {
	listeners, err := activation.Listeners(true)
	if err != nil {
		panic(err)
	}

	if len(listeners) != 1 {
		panic("wrong # of listeners")
	}

	http.HandleFunc("/", HelloServer)
	server := &http.Server{}
	go server.Serve(listeners[0])
	<-stopCh
	server.Shutdown(context.TODO())
}