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diff --git a/gr-comedi/src/comedi_sink_s.h b/gr-comedi/src/comedi_sink_s.h
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+++ b/gr-comedi/src/comedi_sink_s.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_COMEDI_SINK_H
+#define INCLUDED_COMEDI_SINK_H
+
+#include <gr_sync_block.h>
+#include <string>
+#include <comedilib.h>
+#include <stdexcept>
+
+class comedi_sink_s;
+typedef boost::shared_ptr<comedi_sink_s> comedi_sink_s_sptr;
+
+/*!
+ * \brief make a COMEDI sink.
+ *
+ * \param sampling_freq	sampling rate in Hz
+ * \param dev COMEDI device name, e.g., "/dev/comedi0"
+ */
+comedi_sink_s_sptr
+comedi_make_sink_s (int sampling_freq,
+		      const std::string dev = "/dev/comedi0");
+
+/*!
+ * \brief sink using COMEDI
+ *
+ * The sink has one input stream of signed short integers.
+ *
+ * Input samples must be in the range [-32768,32767].
+ */
+class comedi_sink_s : public gr_sync_block {
+  friend comedi_sink_s_sptr
+  comedi_make_sink_s (int sampling_freq, const std::string dev);
+
+  // typedef for pointer to class work method
+  typedef int (comedi_sink_s::*work_t)(int noutput_items,
+					 gr_vector_const_void_star &input_items,
+					 gr_vector_void_star &output_items);
+
+  unsigned int		d_sampling_freq;
+  std::string		d_device_name;
+
+  comedi_t		*d_dev;
+  int			d_subdevice;
+  int			d_n_chan;
+  void			*d_map;
+  int			d_buffer_size;
+  unsigned		d_buf_front;
+  unsigned		d_buf_back;
+
+  // random stats
+  int			d_nunderuns;		// count of underruns
+
+  void output_error_msg (const char *msg, int err);
+  void bail (const char *msg, int err) throw (std::runtime_error);
+
+ protected:
+  comedi_sink_s (int sampling_freq, const std::string device_name);
+
+ public:
+  ~comedi_sink_s ();
+
+  bool check_topology (int ninputs, int noutputs);
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_COMEDI_SINK_H */