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diff --git a/src/i_inout.hpp b/src/i_inout.hpp
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+++ b/src/i_inout.hpp
@@ -0,0 +1,60 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    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 __ZMQ_I_INOUT_HPP_INCLUDED__
+#define __ZMQ_I_INOUT_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    struct i_inout
+    {
+        virtual ~i_inout () {}
+
+        //  Engine asks to get a message to send to the network.
+        virtual bool read (::zmq_msg_t *msg_) = 0;
+
+        //  Engine sends the incoming message further on downstream.
+        virtual bool write (::zmq_msg_t *msg_) = 0;
+
+        //  Flush all the previously written messages downstream.
+        virtual void flush () = 0;
+    
+        //  Drop all the references to the engine. The parameter is the object
+        //  to use to reconnect. If reconnection is not required, the argument
+        //  is set to NULL.
+        virtual void detach (class owned_t *reconnecter_) = 0;
+
+        //  Returns least loaded I/O thread.
+        virtual class io_thread_t *get_io_thread () = 0;
+
+        //  Return pointer to the owning socket.
+        virtual class socket_base_t *get_owner () = 0;
+
+        //  Return ordinal number of the session.
+        virtual uint64_t get_ordinal () = 0;
+    };
+
+}
+
+#endif