PPIF_OPEN
if (sc->sc_flags & PPIF_OPEN)
sc->sc_flags |= PPIF_OPEN;
sc->sc_flags &= ~PPIF_OPEN;
if (sc->sc_flags & PPIF_OPEN)
sc->sc_flags |= PPIF_OPEN;
sc->sc_flags &= ~PPIF_OPEN;