svc_getcallerucred
if (svc_getcallerucred(rqp->rq_xprt, &ucp) != 0 ||
if (svc_getcallerucred(rqstp->rq_xprt, &uc) != 0) {
if (svc_getcallerucred(rqstp->rq_xprt, &uc) != 0) {
if (svc_getcallerucred(transp, &uc) != 0 ||
extern int svc_getcallerucred(const SVCXPRT *, struct ucred_s **);
extern int svc_getcallerucred();