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diff --git a/src/i_demux.hpp b/src/i_demux.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_DEMUX_HPP_INCLUDED__
+#define __ZS_I_DEMUX_HPP_INCLUDED__
+
+namespace zs
+{
+
+    struct i_demux
+    {
+        //  Attaches mux to a particular session.
+        virtual void set_session (class session_t *session_) = 0;
+
+        //  To be called when the whole infrastrucure is being closed (zs_term).
+        virtual void shutdown () = 0;
+
+        //  To be called when session is being closed.
+        virtual void terminate () = 0;
+
+        //  Adds new pipe to the demux to send messages to.
+        virtual void attach_pipe (class pipe_writer_t *pipe_) = 0;
+
+        //  Removes pipe from the demux.
+        virtual void detach_pipe (class pipe_writer_t *pipe_) = 0;
+
+        //  Returns true if there's no pipe attached.
+        virtual bool empty () = 0;
+
+        //  Sends the message. Returns false if the message cannot be sent
+        //  because the pipes are full.
+        virtual bool send (struct zs_msg *msg_) = 0;
+
+        //  Flushes messages downstream.
+        virtual void flush () = 0;
+    };
+
+}
+
+#endif