refuse to start if no ports have been given

diff --git a/jackwsmeter.c b/jackwsmeter.c
index b1b4f132295fa18723ba7b185a2bb2d09f08a662..ecbe1c33ad37ebc1bdcbe8750ad68488e6e7aefc 100644 (file)
--- a/jackwsmeter.c
+++ b/jackwsmeter.c
@@ -405,6 +405,11 @@ int main(int argc, char **argv)
                opts++;
        }
 
+       if (num_meters == 0) {
+               lwsl_err("You must specify at least one port, aborting.");
+               exit(1);
+       }
+
        context = libwebsocket_create_context(&info);
        if (context == NULL) {
                lwsl_err("libwebsocket init failed\n");