Merge pull request #522 from embark-framework/zombie_fix

track if couldn't send message to parent process

lib/process/processWrapper.js

@@ -39,7 +39,11 @@ class ProcessWrapper {
     }
     setInterval(() => {
       try {
-        self.send({action: 'ping'});
+        let result = self.send({action: 'ping'});
+        if (!result) {
+          return error();
+        }
+        self.retries = 0;
       } catch (e) {
         error();
       }
@@ -71,9 +75,9 @@ class ProcessWrapper {
 
   send() {
     if (!process.connected) {
-      return;
+      return false;
     }
-    process.send(...arguments);
+    return process.send(...arguments);
   }
 
   kill() {