if_clone_create
return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name),
int if_clone_create(char *name, int len, caddr_t params, caddr_t data);
return (if_clone_create(ifname, IFNAMSIZ, NULL, (caddr_t)ap->a_dev));
return (if_clone_create(ifname, IFNAMSIZ, NULL, (caddr_t)ap->a_dev));