Show lost packets on exit

packet-exchange/src/server.c

@@ -327,8 +327,13 @@ static void print_histograms() {
 
 static void sigint_handler(int sig_num) {
   (void)sig_num;
+
   if (enable_histograms)
     print_histograms();
+
+  if(param->stats.lost_packets)
+    fprintf(stderr, "%d packets were lost\n");
+
   exit(EXIT_SUCCESS);
 }