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