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diff --git a/src/i_engine.hpp b/src/i_engine.hpp
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+/*
+    Copyright (c) 2007-2013 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_I_ENGINE_HPP_INCLUDED__
+#define __ZMQ_I_ENGINE_HPP_INCLUDED__
+
+namespace zmq
+{
+
+    class io_thread_t;
+
+    //  Abstract interface to be implemented by various engines.
+
+    struct i_engine
+    {
+        virtual ~i_engine () {}
+
+        //  Plug the engine to the session.
+        virtual void plug (zmq::io_thread_t *io_thread_,
+            class session_base_t *session_) = 0;
+
+        //  Terminate and deallocate the engine. Note that 'detached'
+        //  events are not fired on termination.
+        virtual void terminate () = 0;
+
+        //  This method is called by the session to signalise that more
+        //  messages can be written to the pipe.
+        virtual void restart_input () = 0;
+
+        //  This method is called by the session to signalise that there
+        //  are messages to send available.
+        virtual void restart_output () = 0;
+
+        virtual void zap_msg_available () = 0;
+    };
+
+}
+
+#endif