MTF_IO
sc->sc_flags |= MTF_IO;
sc->sc_flags |= MTF_WRT | MTF_IO;
(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO)) == 0){
sc->sc_flags &= ~MTF_IO;
if ((sc->sc_flags & MTF_IO) != 0) {
sc->sc_flags &= ~MTF_IO;
sc->sc_flags &= ~MTF_IO;
sc->sc_flags |= MTF_IO;
sc->sc_flags |= MTF_WRT | MTF_IO;
!(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){
sc->sc_flags &= ~MTF_IO;
if (sc->sc_flags & MTF_IO) {
sc->sc_flags &= ~MTF_IO;
sc->sc_flags &= ~MTF_IO;