eal: add application usage hook

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal.c

diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index bedf5be..afa0cce 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -103,6 +103,8 @@
        (in) = end + 1;                                         \
 }
 
+/* Allow the application to print its usage message too if set */
+static rte_usage_hook_t        rte_application_usage_hook = NULL;
 /* early configuration structure, when memory config is not mmapped */
 static struct rte_mem_config early_mem_config;
 
@@ -329,6 +331,24 @@ eal_usage(const char *prgname)
               "  --"OPT_NO_HPET"  : disable hpet\n"
               "  --"OPT_NO_SHCONF": no shared config (mmap'd files)\n\n",
               prgname);
+       /* Allow the application to print its usage message too if hook is set */
+       if ( rte_application_usage_hook ) {
+               printf("===== Application Usage =====\n\n");
+               rte_application_usage_hook(prgname);
+       }
+}
+
+/* Set a per-application usage message */
+rte_usage_hook_t
+rte_set_application_usage_hook( rte_usage_hook_t usage_func )
+{
+       rte_usage_hook_t        old_func;
+
+       /* Will be NULL on the first call to denote the last usage routine. */
+       old_func                                        = rte_application_usage_hook;
+       rte_application_usage_hook      = usage_func;
+
+       return old_func;
 }
 
 /*