CTF_OPEN
if (sc->sc_flags & CTF_OPEN)
sc->sc_flags |= CTF_OPEN;
sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);
if (sc->sc_flags & CTF_OPEN)
sc->sc_flags |= CTF_OPEN;
sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);