dynevent_arg_add
extern int dynevent_arg_add(struct dynevent_cmd *cmd,
ret = dynevent_arg_add(cmd, &arg, NULL);
ret = dynevent_arg_add(cmd, &arg, NULL);
ret = dynevent_arg_add(cmd, &arg, NULL);
ret = dynevent_arg_add(cmd, &arg, NULL);
ret = dynevent_arg_add(cmd, &arg, NULL);
ret = dynevent_arg_add(cmd, &arg, NULL);