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diff --git a/src/udp_sender.hpp b/src/udp_sender.hpp
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+++ b/src/udp_sender.hpp
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+/*
+    Copyright (c) 2012 Martin Lucina <martin@lucina.net>
+
+    This file is part of Crossroads I/O.
+
+    Crossroads I/O is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+    Crossroads I/O is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __XS_UDP_SENDER_HPP_INCLUDED__
+#define __XS_UDP_SENDER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#include "stdint.hpp"
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "address.hpp"
+#include "encoder.hpp"
+
+namespace xs
+{
+
+    class io_thread_t;
+    class session_base_t;
+
+    class udp_sender_t : public io_object_t, public i_engine
+    {
+
+    public:
+
+        udp_sender_t (xs::io_thread_t *parent_, const options_t &options_);
+        ~udp_sender_t ();
+
+        int init (const char *address_);
+
+        //  i_engine interface implementation.
+        void plug (xs::io_thread_t *io_thread_,
+            xs::session_base_t *session_);
+        void unplug ();
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
+
+        //  i_poll_events interface implementation.
+        void in_event (fd_t fd_);
+        void out_event (fd_t fd_);
+        void timer_event (handle_t handle_);
+
+    private:
+
+        //  Underlying UDP socket.
+        fd_t socket;
+        handle_t socket_handle;
+
+        //  Socket address.
+        address_t address;
+
+        //  Socket options.
+        options_t options;
+
+        //  Encoder for this socket.
+        encoder_t encoder;
+
+        //  Associated session.
+        xs::session_base_t *session;
+
+        //  UDP packet header size.
+        static const size_t udp_header_size = 6;
+
+        //  Packet buffer for outgoing packets.
+        unsigned char data [pgm_max_tpdu];
+
+        //  Sequence number for outgoing packets.
+        uint32_t seq_no;
+
+        //  Backoff timer if receiver is not present.
+        handle_t backoff_timer;
+
+        udp_sender_t (const udp_sender_t&);
+        const udp_sender_t &operator = (const udp_sender_t&);
+    };
+
+}
+
+#endif