if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
wait_node->app->notify_sock = ust_cmd->sock;
cds_list_del(&wait_node->head);
if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
wait_node->app->notify_sock = ust_cmd->sock;
cds_list_del(&wait_node->head);