PARF_OPEN
if (sc->sc_flags & PARF_OPEN)
sc->sc_flags |= PARF_OPEN;
sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
if (sc->sc_flags & PARF_OPEN)
sc->sc_flags |= PARF_OPEN;
sc->sc_flags &= ~(PARF_OPEN|PARF_OWRITE);