Add multiple results and timeout handling to the Mac OS mDNS native extension

pkg/mdns/lib/src/native_extension_client.dart

 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 library mdns.src.native_extension_client;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 
@@ skipping 52 matching lines @@
       String name,
       {Duration timeout: const Duration(seconds: 5)}) {
     if (!_started) {
       throw new StateError('mDNS client is not started');
     }
 
     // Add the pending request before sending the query.
     var result = _resolver.addPendingRequest(type, name, timeout);
 
     // Send the request.
+    //
+    //  response[0]: reply port (SendPort)
+    //  response[1]: request type (int)
+    //  response[2]: record type (int)
+    //  response[3]: data (Uint8List)
+    //  response[4]: timeout in milliseconds (int)
     _service.send([_incoming.sendPort,
                    RequestType.lookupRequest.index,
                    type,
-                   name]);
+                   name,
+                   timeout.inMilliseconds]);
 
     return result;
   }
 
   // Process incoming responses.
   _handleIncoming(response) {
     // Right now the only response we can get is the response to a
     // lookupRequest where the response looks like this:
     //
     //  response[0]: fullname (String)
@@ skipping 49 matching lines @@
   await native_extension_api.loadLibrary();
   SendPort service = native_extension_api.servicePort();
   ReceivePort port = new ReceivePort();
   try {
     service.send([port.sendPort, RequestType.echoRequest.index, message]);
     return await port.first;
   } finally {
     port.close();
   }
 }