tidy up ping node listeners

io/ping/88-ping.js

@@ -42,7 +42,13 @@ module.exports = function(RED) {
         //monitor every spawned process & SIGINT if too long
         var spawnTout = setTimeout(() => {
             node.log(`ping - Host '${hostOptions.host}' process timeout - sending SIGINT`)
-            try{if(ex && ex.pid){ ex.kill("SIGINT"); }} catch(e){console.warn(e)}
+            try {
+                if (ex && ex.pid) { 
+                    ex.removeAllListeners();
+                    ex.kill("SIGINT"); 
+                }
+            } 
+            catch(e) { console.warn(e) }
         }, hostOptions.timeout+1000); //add 1s for grace
 
         var res = false;
@@ -50,9 +56,11 @@ module.exports = function(RED) {
         var fail = false;
         //var regex = /from.*time.(.*)ms/;
         var regex = /=.*[<|=]([0-9]*).*TTL|ttl..*=([0-9\.]*)/;
+        if (ex && ex.hasOwnProperty("stdout")) {
             ex.stdout.on("data", function (data) {
                 line += data.toString();
             });
+        }
         ex.on("exit", function (err) {
             clearTimeout(spawnTout);
         });
@@ -127,8 +135,6 @@ module.exports = function(RED) {
         this.on("close", function() {
             clearPingInterval();
         });
-
-
     }
     RED.nodes.registerType("ping",PingNode);
 }

io/ping/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-ping",
-    "version"       : "0.2.0",
+    "version"       : "0.2.1",
     "description"   : "A Node-RED node to ping a remote server, for use as a keep-alive check.",
     "dependencies"  : {
     },