slist_add_all
int slist_add_all (slist *, slist *);
if (slist_add_all(&realms0, &_this->realms) != 0) {
(void)slist_add_all(&_this->realms, &nrealms);
(void)slist_add_all(&_this->realms, &realms0);
if (slist_add_all(&rmlist, &_this->listener) != 0)
(void)slist_add_all(&_this->listener, &newlist);