UTVFU_FLAG_MMAP
sc->sc_flags &= ~UTVFU_FLAG_MMAP;
if ((sc->sc_flags & UTVFU_FLAG_MMAP) == 0)
sc->sc_flags |= UTVFU_FLAG_MMAP;
if (sc->sc_flags & UTVFU_FLAG_MMAP)
sc->sc_flags &= ~UTVFU_FLAG_MMAP;
if (sc->sc_flags & UTVFU_FLAG_MMAP) {