ife_print(ife); return 0;
static int do_if_print(struct interface *ife, void *cookie){    int *opt_a = (int *)cookie;     if (if_fetch(ife->name, ife) < 0) {		fprintf (stderr, _("%s: unknown interface.\n"), ife->name);		return -1;    }    if (!(ife->flags & IFF_UP) && !(*opt_a))		return 0;    ife_print(ife); 	return 0;}