Stop to use panic

cmd/ping/ping.go

@@ -40,7 +40,7 @@ func main() {
 	})
 
 	p.MaxRTT = time.Second
-	quit := p.RunLoop()
+	quit, errch := p.RunLoop()
 
 	c := make(chan os.Signal, 1)
 	signal.Notify(c, os.Interrupt)
@@ -65,6 +65,9 @@ loop:
 				}
 				results[host] = nil
 			}
+		case err := <-errch:
+			fmt.Println("Ping failed: %v", err)
+			break loop;
 		}
 	}
 	wait := make(chan bool)