YPPROC_MAPLIST
r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MAPLIST,
retval = clnt_call(ypserv, (unsigned int)YPPROC_MAPLIST,
r = clnt_call(client, YPPROC_MAPLIST, xdr_ypdomain_wrap_string,
case YPPROC_MAPLIST: