CECF_READ
sc->sc_flags &= ~(CECF_IO | CECF_READ | CECF_TIMO);
sc->sc_flags |= CECF_READ;
if (sc->sc_flags & CECF_READ) {
sc->sc_flags &= ~(CECF_IO | CECF_READ | CECF_TIMO);
sc->sc_flags & CECF_READ ? "read" : "write");