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diff --git a/src/tcp_engine.hpp b/src/tcp_engine.hpp
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+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ 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.
+
+    0MQ 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 __ZMQ_TCP_ENGINE_HPP_INCLUDED__
+#define __ZMQ_TCP_ENGINE_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "fd.hpp"
+#include "i_engine.hpp"
+#include "io_object.hpp"
+#include "encoder.hpp"
+#include "decoder.hpp"
+#include "options.hpp"
+
+namespace zmq
+{
+
+    class tcp_engine_t : public io_object_t, public i_engine
+    {
+    public:
+
+        tcp_engine_t (fd_t fd_, const options_t &options_);
+        ~tcp_engine_t ();
+
+        //  i_engine interface implementation.
+        void plug (class io_thread_t *io_thread_, class session_t *session_);
+        void unplug ();
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+
+    private:
+
+        //  Function to handle network disconnections.
+        void error ();
+
+        //  Associates a socket with a native socket descriptor.
+        int open (fd_t fd_, int sndbuf_, int rcvbuf_);
+         
+        //  Closes the underlying socket.
+        int close ();
+
+        //  Writes data to the socket. Returns the number of bytes actually
+        //  written (even zero is to be considered to be a success). In case
+        //  of error or orderly shutdown by the other peer -1 is returned.
+        int write (const void *data_, size_t size_);
+
+        //  Reads data from the socket (up to 'size' bytes). Returns the number
+        //  of bytes actually read (even zero is to be considered to be
+        //  a success). In case of error or orderly shutdown by the other
+        //  peer -1 is returned.
+        int read (void *data_, size_t size_);
+
+        //  Underlying socket.
+        fd_t s;
+
+        handle_t handle;
+
+        unsigned char *inpos;
+        size_t insize;
+        decoder_t decoder;
+
+        unsigned char *outpos;
+        size_t outsize;
+        encoder_t encoder;
+
+        //  The session this engine is attached to.
+        class session_t *session;
+
+        //  Detached transient session.
+        class session_t *leftover_session;
+
+        options_t options;
+
+        bool plugged;
+
+        tcp_engine_t (const tcp_engine_t&);
+        const tcp_engine_t &operator = (const tcp_engine_t&);
+    };
+
+}
+
+#endif