SEL_WAIT
sc->sel_stat[chan] = SEL_WAIT;
if (sc->sel_stat[chan] != SEL_WAIT) {
sc->sel_stat[chan] = SEL_WAIT;
sc->sel_stat[chan] = SEL_WAIT;
sc->sel_stat[chan] = SEL_WAIT;
sc->sel_stat[chan] = SEL_WAIT;
sc->sel_stat[i] = SEL_WAIT;