URE_FLAG_LINK
if ((sc->sc_flags & URE_FLAG_LINK) == 0
sc->sc_flags |= URE_FLAG_LINK;
sc->sc_flags |= URE_FLAG_LINK;
sc->sc_flags &= ~URE_FLAG_LINK;
sc->sc_flags &= ~URE_FLAG_LINK;
old_link = (sc->sc_flags & URE_FLAG_LINK) ? true : false;
sc->sc_flags &= ~URE_FLAG_LINK;
sc->sc_flags |= URE_FLAG_LINK;
sc->sc_flags |= URE_FLAG_LINK;
new_link = (sc->sc_flags & URE_FLAG_LINK) ? true : false;
sc->sc_flags |= URE_FLAG_LINK;
if ((sc->sc_flags & URE_FLAG_LINK) == 0) {