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diff --git a/gnuradio-runtime/include/gr_select_handler.h b/gnuradio-runtime/include/gr_select_handler.h
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+++ b/gnuradio-runtime/include/gr_select_handler.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_SELECT_HANDLER_H
+#define INCLUDED_GR_SELECT_HANDLER_H
+
+#include <gr_runtime_api.h>
+#include <boost/shared_ptr.hpp>
+
+class gr_select_handler;
+typedef boost::shared_ptr<gr_select_handler> gr_select_handler_sptr;
+
+
+/*!
+ * \brief Abstract handler for select based notification.
+ * \ingroup base
+ *
+ * \sa gr_dispatcher
+ */
+class GR_RUNTIME_API gr_select_handler
+{
+  int	d_fd;
+
+protected:
+  gr_select_handler(int file_descriptor);
+
+public:
+  virtual ~gr_select_handler();
+
+  int fd() const { return d_fd; }
+  int file_descriptor() const { return d_fd; }
+
+  /*!
+   * \brief Called when file_descriptor is readable.
+   *
+   * Called when the dispatcher detects that file_descriptor can
+   * be read without blocking.
+   */
+  virtual void handle_read() = 0;
+
+  /*!
+   * \brief Called when file_descriptor is writable.
+   *
+   * Called when dispatcher detects that file descriptor can be
+   * written without blocking.
+   */
+  virtual void handle_write() = 0;
+
+  /*!
+   * Called each time around the dispatcher loop to determine whether
+   * this handler's file descriptor should be added to the list on which
+   * read events can occur.  The default method returns true, indicating
+   * that by default, all handlers are interested in read events.
+   */
+  virtual bool readable() { return true; }
+
+  /*!
+   * Called each time around the dispatcher loop to determine whether
+   * this handler's file descriptor should be added to the list on which
+   * write events can occur.  The default method returns true, indicating
+   * that by default, all handlers are interested in write events.
+   */
+  virtual bool writable() { return true; }
+};
+
+#endif /* INCLUDED_GR_SELECT_HANDLER_H */