rn_inithead
if (rn_inithead((void **)&mask_rnhead, 0) == 0) {
int rn_inithead(void **, uint_t);
(void) rn_inithead((void**)&rhead, 32);
if (rn_inithead((void **)(void *)&mask_rnhead, 0) == 0)
(void) rn_inithead((void **)&ipst->ips_ip_ftable, 32);
if (rn_inithead((void **)&h->ipo_head,
int rn_inithead __P((void **, int));
int rn_inithead(void **, int);