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diff --git a/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.h b/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.h
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index 0000000000..cd865734f2
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+++ b/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.h
@@ -0,0 +1,67 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003 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 _GR_VMCIRCBUF_MMAP_TMPFILE_H_
+#define _GR_VMCIRCBUF_MMAP_TMPFILE_H_
+
+#include <gr_runtime_api.h>
+#include <gr_vmcircbuf.h>
+
+/*!
+ * \brief concrete class to implement circular buffers with mmap and shm_open
+ * \ingroup internal
+ */
+class GR_RUNTIME_API gr_vmcircbuf_mmap_tmpfile : public gr_vmcircbuf {
+ public:
+
+  // CREATORS
+
+  gr_vmcircbuf_mmap_tmpfile (int size);
+  virtual ~gr_vmcircbuf_mmap_tmpfile ();
+};
+
+/*!
+ * \brief concrete factory for circular buffers built using mmap and shm_open
+ */
+class GR_RUNTIME_API gr_vmcircbuf_mmap_tmpfile_factory : public gr_vmcircbuf_factory {
+ private:
+  static gr_vmcircbuf_factory	*s_the_factory;
+
+ public:
+  static gr_vmcircbuf_factory *singleton ();
+
+  virtual const char *name () const { return "gr_vmcircbuf_mmap_tmpfile_factory"; }
+
+  /*!
+   * \brief return granularity of mapping, typically equal to page size
+   */
+  virtual int granularity ();
+
+  /*!
+   * \brief return a gr_vmcircbuf, or 0 if unable.
+   *
+   * Call this to create a doubly mapped circular buffer.
+   */
+  virtual gr_vmcircbuf *make (int size);
+};
+
+#endif /* _GR_VMCIRCBUF_MMAP_TMPFILE_H_ */