Merge pull request #115 from jitsi/fix-filedescriptor-leak

Fixes leak of file descriptors

src/main/java/org/ice4j/socket/DelegatingDatagramSocket.java

@@ -115,6 +115,11 @@ static boolean logNonStun(long numOfPacket)
      */
     private long nbSentPackets = 0;
 
+    /**
+     * Whether this socket has been closed.
+     */
+    private boolean closed = false;
+
     /**
      * Initializes a new <tt>DelegatingDatagramSocket</tt> instance and binds it
      * to any available port on the local host machine.  The socket will be
@@ -282,10 +287,14 @@ public void bind(SocketAddress addr)
     @Override
     public void close()
     {
-        if (delegate == null)
-            super.close();
-        else
+        // We want both #delegate and super to actually get closed (and release
+        // the FDs which they hold). But super will not close unless isClosed()
+        // returns false. So we update the #closed flag last.
+        if (delegate != null)
             delegate.close();
+
+        super.close();
+        closed = true;
     }
 
     /**
@@ -610,7 +619,7 @@ public boolean isBound()
     @Override
     public boolean isClosed()
     {
-        return (delegate == null) ? super.isClosed() : delegate.isClosed();
+        return closed;
     }
 
     /**

src/main/java/org/ice4j/socket/MultiplexedDatagramSocket.java

@@ -118,6 +118,8 @@ public int getReceiveBufferSize()
     public void close()
     {
         multiplexing.close(this);
+
+        super.close();
     }
 
     /**

src/main/java/org/ice4j/socket/RelayedCandidateDatagramSocket.java

@@ -350,6 +350,8 @@ public void close()
                 turnCandidateHarvest.hostCandidate.getTransportAddress(),
                 this);
         turnCandidateHarvest.close(this);
+
+        super.close();
     }
 
     /**