dgram: bring back setMulticastLoopback()

lib/dgram.js

@@ -248,7 +248,13 @@ Socket.prototype.setMulticastTTL = function(arg) {
 
 
 Socket.prototype.setMulticastLoopback = function(arg) {
-  throw new Error('not yet implemented');
+  arg = arg ? 1 : 0;
+
+  if (this._handle.setMulticastLoopback(arg)) {
+    throw errnoException(errno, 'setMulticastLoopback');
+  }
+
+  return arg; // 0.4 compatibility
 };
 
 

src/udp_wrap.cc

@@ -94,6 +94,7 @@ public:
   static Handle<Value> AddMembership(const Arguments& args);
   static Handle<Value> DropMembership(const Arguments& args);
   static Handle<Value> SetMulticastTTL(const Arguments& args);
+  static Handle<Value> SetMulticastLoopback(const Arguments& args);
   static Handle<Value> SetBroadcast(const Arguments& args);
 
 private:
@@ -156,6 +157,7 @@ void UDPWrap::Initialize(Handle<Object> target) {
   NODE_SET_PROTOTYPE_METHOD(t, "addMembership", AddMembership);
   NODE_SET_PROTOTYPE_METHOD(t, "dropMembership", DropMembership);
   NODE_SET_PROTOTYPE_METHOD(t, "setMulticastTTL", SetMulticastTTL);
+  NODE_SET_PROTOTYPE_METHOD(t, "setMulticastLoopback", SetMulticastLoopback);
   NODE_SET_PROTOTYPE_METHOD(t, "setBroadcast", SetBroadcast);
 
   target->Set(String::NewSymbol("UDP"),
@@ -262,6 +264,7 @@ Handle<Value> UDPWrap::DropMembership(const Arguments& args) {
   return SetMembership(args, UV_LEAVE_GROUP);
 }
 
+
 Handle<Value> UDPWrap::SetMulticastTTL(const Arguments& args) {
   HandleScope scope;
   UNWRAP
@@ -277,6 +280,23 @@ Handle<Value> UDPWrap::SetMulticastTTL(const Arguments& args) {
   return scope.Close(Integer::New(r));
 }
 
+
+Handle<Value> UDPWrap::SetMulticastLoopback(const Arguments& args) {
+  HandleScope scope;
+  UNWRAP
+
+  assert(args.Length() == 1);
+
+  int on = args[0]->Int32Value();
+  int r = uv_udp_set_multicast_loop(&wrap->handle_, on);
+
+  if (r)
+    SetErrno(uv_last_error(uv_default_loop()));
+
+  return scope.Close(Integer::New(r));
+}
+
+
 Handle<Value> UDPWrap::DoSend(const Arguments& args, int family) {
   HandleScope scope;
   int r;

test/simple/test-dgram-multicast-multi-process.js

@@ -98,10 +98,13 @@ if (cluster.isMaster) {
   }
 
   var sendSocket = dgram.createSocket('udp4');
+  sendSocket.bind(); // FIXME a libuv limitation makes it necessary to bind()
+                     // before calling any of the set*() functions - the bind()
+                     // call is what creates the actual socket...
 
-  //sendSocket.setBroadcast(true);
-  //sendSocket.setMulticastTTL(1);
-  //sendSocket.setMulticastLoopback(true);
+  sendSocket.setBroadcast(true);
+  sendSocket.setMulticastTTL(1);
+  sendSocket.setMulticastLoopback(true);
 
   sendSocket.on('close', function() {
     console.error('sendSocket closed');