remove signal handler, add Stop method (#10)

* remove signal handler, add Stop method

* Added ICMP Packet ID to distinguish ICMP replies

ping.go

@@ -48,8 +48,6 @@ import (
 	"math"
 	"math/rand"
 	"net"
-	"os"
-	"os/signal"
 	"sync"
 	"syscall"
 	"time"
@@ -94,7 +92,6 @@ func NewPinger(addr string) (*Pinger, error) {
 		network:  "udp",
 		ipv4:     ipv4,
 		Size:    timeSliceLength,
-
 		done: make(chan bool),
 	}, nil
 }
@@ -290,14 +287,9 @@ func (p *Pinger) run() {
 
 	timeout := time.NewTicker(p.Timeout)
 	interval := time.NewTicker(p.Interval)
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt)
-	signal.Notify(c, syscall.SIGTERM)
 
 	for {
 		select {
-		case <-c:
-			close(p.done)
 		case <-p.done:
 			wg.Wait()
 			return
@@ -325,6 +317,10 @@ func (p *Pinger) run() {
 	}
 }
 
+func (p *Pinger) Stop() {
+	close(p.done)
+}
+
 func (p *Pinger) finish() {
 	handler := p.OnFinish
 	if handler != nil {