xdr_ypall
&allreq, xdr_ypall, &cbinfo, tcp_timeout);
(char *)&allreq, (xdrproc_t)xdr_ypall, (char *)&cbinfo,
extern bool xdr_ypall(XDR *, struct ypall_callback *);
(xdrproc_t)xdr_ypall, (char *)callback, tp_timout);
(xdrproc_t)xdr_ypall, (char *)callback, tp_timout);