KN_DISABLED
if ((kev->flags & EV_DISABLE) && ((kn->kn_status & KN_DISABLED) == 0))
kn->kn_status |= KN_DISABLED;
if ((kev->flags & EV_ENABLE) && (kn->kn_status & KN_DISABLED)) {
kn->kn_status &= ~KN_DISABLED;
if (kn->kn_status & KN_DISABLED) {
kn->kn_status |= KN_DISABLED;
if ((kn->kn_status & (KN_QUEUED | KN_DISABLED)) == 0)