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diff --git a/src/mailbox.hpp b/src/mailbox.hpp
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+++ b/src/mailbox.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_MAILBOX_HPP_INCLUDED__
+#define __ZMQ_MAILBOX_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "platform.hpp"
+#include "fd.hpp"
+#include "stdint.hpp"
+#include "config.hpp"
+#include "command.hpp"
+
+namespace zmq
+{
+
+    class mailbox_t
+    {
+    public:
+
+        mailbox_t ();
+        ~mailbox_t ();
+
+        fd_t get_fd ();
+        void send (const command_t &cmd_);
+        int recv (command_t *cmd_, bool block_);
+        
+    private:
+
+        //  Write & read end of the socketpair.
+        fd_t w;
+        fd_t r;
+
+        //  Platform-dependent function to create a socketpair.
+        static int make_socketpair (fd_t *r_, fd_t *w_);
+
+        //  Disable copying of mailbox_t object.
+        mailbox_t (const mailbox_t&);
+        const mailbox_t &operator = (const mailbox_t&);
+    };
+
+}
+
+#endif