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diff --git a/src/ip.hpp b/src/ip.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_IP_HPP_INCLUDED__
+#define __ZMQ_IP_HPP_INCLUDED__
+
+#include <string>
+#include "fd.hpp"
+
+namespace zmq
+{
+
+    //  Same as socket(2), but allows for transparent tweaking the options.
+    fd_t open_socket (int domain_, int type_, int protocol_);
+
+    //  Sets the socket into non-blocking mode.
+    void unblock_socket (fd_t s_);
+
+    //  Enable IPv4-mapping of addresses in case it is disabled by default.
+    void enable_ipv4_mapping (fd_t s_);
+
+    //  Returns string representation of peer's address.
+    //  Socket sockfd_ must be connected. Returns true iff successful.
+    bool get_peer_ip_address (fd_t sockfd_, std::string &ip_addr_);
+
+}
+
+#endif