Explicitly handle listen sockets and connection sockets differently in Linux and Mac OS eventhandler

runtime/bin/socket_impl.dart

Index: runtime/bin/socket_impl.dart
diff --git a/runtime/bin/socket_impl.dart b/runtime/bin/socket_impl.dart
index fa5e897aa164f099a39757e8ba358944230a9d65..62dd538e68b7e9716d9ee5d96aba42b69c601d1c 100644
--- a/runtime/bin/socket_impl.dart
+++ b/runtime/bin/socket_impl.dart
@@ -15,7 +15,9 @@ class _SocketBase {
   static final int _FIRST_EVENT = _IN_EVENT;
   static final int _LAST_EVENT = _CLOSE_EVENT;
 
-  static final int _CLOSE_COMMAND = 4;
+  static final int _CLOSE_COMMAND = 8;
+
+  static final int _LISTEN_SOCKET = 16;
 
   _SocketBase () {
     _handler = new ReceivePort();
@@ -72,7 +74,9 @@ class _SocketBase {
 
   void _doActivateHandlers() {
     if (_canActivateHandlers && (_id >= 0)) {
-      EventHandler._sendData(_id, _handler, _handlerMask);
+      int data = _handlerMask;
+      if (_isListenSocket()) data |= (1 << _LISTEN_SOCKET);
+      EventHandler._sendData(_id, _handler, data);
     }
   }
 
@@ -106,6 +110,7 @@ class _SocketBase {
     }
   }
 
+  abstract bool _isListenSocket();
 
   /*
    * Socket id is set from native. -1 indicates that the socket was closed.
@@ -180,6 +185,8 @@ class _ServerSocket extends _SocketBase implements ServerSocket {
   void setConnectionHandler(void callback()) {
     _setHandler(_IN_EVENT, callback);
   }
+
+  bool _isListenSocket() => true;
 }
 
 
@@ -275,6 +282,8 @@ class _Socket extends _SocketBase implements Socket {
     _setHandler(_CLOSE_EVENT, callback);
   }
 
+  bool _isListenSocket() => false;
+
   InputStream get inputStream() {
     if (_inputStream == null) {
       _inputStream = new SocketInputStream(this);