UNP_WANTCRED_ONESHOT
unp2->unp_flags &= ~UNP_WANTCRED_ONESHOT;
optval = unp->unp_flags & UNP_WANTCRED_ONESHOT ? 1 : 0;
OPTSET(UNP_WANTCRED_ONESHOT, UNP_WANTCRED_ALWAYS);
OPTSET(UNP_WANTCRED_ALWAYS, UNP_WANTCRED_ONESHOT);
if (unp_flags & UNP_WANTCRED_ONESHOT) {
#define UNP_WANTCRED_MASK (UNP_WANTCRED_ONESHOT | UNP_WANTCRED_ALWAYS)