yp_master
if (yp_master(ypdomain, PKMAP, &ypmaster) != 0) {
if (yp_master(domain, PKMAP, &master) != 0) {
extern int yp_master(char *, char *, char **);
if (yp_master(domain, map, &ypmaster) != 0) {
if (yp_master(nisbuf->domain, "passwd.byname", &nisbuf->master) != 0) {
if ((yp_master(domain, (char *)map, &host) != 0) &&
(yp_master(domain, "passwd.byname", &host) != 0))