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diff --git a/src/fd_signaler.hpp b/src/fd_signaler.hpp
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+++ b/src/fd_signaler.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_FD_SIGNALER_HPP_INCLUDED__
+#define __ZS_FD_SIGNALER_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "i_signaler.hpp"
+#include "fd.hpp"
+#include "stdint.hpp"
+
+namespace zs
+{
+
+    //  This object can be used to send individual signals from one thread to
+    //  another. The specific of this pipe is that it has associated file
+    //  descriptor and so it can be polled on. Same signal cannot be sent twice
+    //  unless signals are retrieved by the reader side in the meantime.
+
+    class fd_signaler_t : public i_signaler
+    {
+    public:
+
+        typedef uint64_t signals_t;
+
+        //  Initialise the object.
+        fd_signaler_t ();
+
+        //  Destroy the object.
+        ~fd_signaler_t ();
+
+        //  Send specific signal.
+        void signal (int signal_);
+
+        //  Retrieves signals. Returns a set of signals in form of a bitmap.
+        //  Signal with index 0 corresponds to value 1, index 1 to value 2,
+        //  index 2 to value 4 etc. If there is no signal available,
+        //  it returns zero immediately.
+        signals_t check ();
+
+        //  Get the file descriptor associated with the object.
+        fd_t get_fd ();
+
+    private:
+
+#if defined ZMQ_HAVE_OPENVMS
+
+         //  Whilst OpenVMS supports socketpair - it maps to AF_INET only.
+         //  Further, it does not set the socket options TCP_NODELAY and
+         //  TCP_NODELACK which can lead to performance problems. We'll
+         //  overload the socketpair function for this class.
+         //
+         //  The bug will be fixed in V5.6 ECO4 and beyond.  In the
+         //  meantime, we'll create the socket pair manually.
+         static int socketpair (int domain_, int type_, int protocol_,
+             int sv_ [2]);
+
+#endif
+
+#if defined ZS_HAVE_EVENTFD
+        //  Eventfd descriptor.
+        fd_t fd;
+#else
+        //  Write & read end of the socketpair.
+        fd_t w;
+        fd_t r;
+#endif
+
+        //  Disable copying of fd_signeler object.
+        fd_signaler_t (const fd_signaler_t&);
+        void operator = (const fd_signaler_t&);
+    };
+
+}
+
+#endif