OSIOP_INTSOFF
if (sc->sc_flags & OSIOP_INTSOFF)
acb->intstat = sc->sc_flags & OSIOP_INTSOFF;
sc->sc_flags |= OSIOP_INTSOFF;
sc->sc_flags &= ~OSIOP_INTSOFF;
sc->sc_flags &= ~(OSIOP_INTDEFER | OSIOP_INTSOFF);
if ((sc->sc_flags & (OSIOP_INTSOFF | OSIOP_INTDEFER)) !=
OSIOP_INTSOFF) {
sc->sc_flags &= ~OSIOP_INTSOFF;
sc->sc_flags &= ~(OSIOP_INTDEFER | OSIOP_INTSOFF);