RFNoC: Handle receive of 0 samples

Returns immediately if requested number of samples is zero.  Prevents
timeout error from being thrown if user requests no samples.

Signed-off-by: michael-west <michael.west@ettus.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/transport/rx_streamer_impl.hpp b/host/lib/include/uhdlib/transport/rx_streamer_impl.hpp
index ce66d2ccb..087a13de7 100644
--- a/host/lib/include/uhdlib/transport/rx_streamer_impl.hpp
+++ b/host/lib/include/uhdlib/transport/rx_streamer_impl.hpp
@@ -132,6 +132,11 @@ public:
         const double timeout,
         const bool one_packet)
     {
+        if (nsamps_per_buff == 0) {
+            metadata.reset();
+            return 0;
+        }
+
         if (_error_metadata_cache.check(metadata)) {
             return 0;
         }
diff --git a/host/lib/transport/super_recv_packet_handler.hpp b/host/lib/transport/super_recv_packet_handler.hpp
index f428f01f1..c6947ba26 100644
--- a/host/lib/transport/super_recv_packet_handler.hpp
+++ b/host/lib/transport/super_recv_packet_handler.hpp
@@ -238,6 +238,12 @@ public:
                 return 0;
         }
 
+        // Just return if no samples requested
+        if (nsamps_per_buff == 0) {
+            metadata.reset();
+            return 0;
+        }
+
         size_t accum_num_samps =
             recv_one_packet(buffs, nsamps_per_buff, metadata, timeout);