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diff --git a/src/i_engine.hpp b/src/i_engine.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_I_ENGINE_HPP_INCLUDED__
+#define __ZS_I_ENGINE_HPP_INCLUDED__
+
+namespace zs
+{
+
+    //  Generic interface to access engines from MD objects.
+
+    struct i_engine
+    {
+        //  Attach the engine with specified context.
+        virtual void attach (struct i_poller *poller_,
+            struct i_session *session_) = 0;
+
+        //  Detach the engine from the current context.
+        virtual void detach () = 0;
+
+        //  Notify the engine that new messages are available.
+        virtual void revive () = 0;
+
+        //  Called by session when it decides the engine
+        //  should terminate itself.
+        virtual void schedule_terminate () = 0;
+
+        //  Called by normal object termination process.
+        virtual void terminate () = 0;
+
+        //  To be called by MD when terminal shutdown (zs_term) is in progress.
+        virtual void shutdown () = 0;
+    };
+
+}
+
+#endif