1 files changed, 66 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_nop.cc b/gnuradio-core/src/lib/general/gr_nop.cc
new file mode 100644
index 000000000..edfe1d76d
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_nop.cc
@@ -0,0 +1,66 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <gr_nop.h>
+#include <gr_io_signature.h>
+#include <boost/bind.hpp>
+
+gr_nop_sptr
+gr_make_nop (size_t sizeof_stream_item)
+{
+  return gnuradio::get_initial_sptr (new gr_nop (sizeof_stream_item));
+}
+
+gr_nop::gr_nop (size_t sizeof_stream_item)
+  : gr_block ("nop",
+	      gr_make_io_signature (0, -1, sizeof_stream_item),
+	      gr_make_io_signature (0, -1, sizeof_stream_item)),
+    d_nmsgs_recvd(0)
+{
+  // Arrange to have count_received_msgs called when messages are received.
+  message_port_register_in(pmt::mp("port"));
+  set_msg_handler(pmt::mp("port"), boost::bind(&gr_nop::count_received_msgs, this, _1));
+}
+
+// Trivial message handler that just counts them.
+// (N.B., This feature is used in qa_set_msg_handler)
+void
+gr_nop::count_received_msgs(pmt::pmt_t msg)
+{
+  d_nmsgs_recvd++;
+}
+
+int
+gr_nop::general_work (int noutput_items,
+		      gr_vector_int &ninput_items,
+		      gr_vector_const_void_star &input_items,
+		      gr_vector_void_star &output_items)
+{
+  // eat any input that's available
+  for (unsigned i = 0; i < ninput_items.size (); i++)
+    consume (i, ninput_items[i]);
+
+  return noutput_items;
+}