UNP_WANTCRED
if (unp->unp_conn->unp_flags & UNP_WANTCRED)
if (unp->unp_conn->unp_flags & UNP_WANTCRED) {
unp->unp_conn->unp_flags &= ~UNP_WANTCRED;
OPTSET(UNP_WANTCRED);
optval = OPTBIT(UNP_WANTCRED);