app/proc_info: check for primary process

Add a check to see if the primary process is running and exit gracefully
if it is not.

Suggested-by: Patrick Kutch <patrick.g.kutch@intel.com>
Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

app/proc_info/main.c

@@ -329,6 +329,9 @@ main(int argc, char **argv)
 	argc -= ret;
 	argv += (ret - 3);
 
+	if (!rte_eal_primary_proc_alive(NULL))
+		rte_exit(EXIT_FAILURE, "No primary DPDK process is running.\n");
+
 	/* parse app arguments */
 	ret = proc_info_parse_args(argc, argv);
 	if (ret < 0)