clread(dev, uio, flag)
int clread (dev, uio, flag)
clread(dev, uio, flag)	dev_t dev;	struct uio *uio;	int flag;{	int unit, channel;	struct tty *tp;	struct cl_info *cl;	struct clsoftc *sc;	unit = CL_UNIT(dev);	if (unit >= clcd.cd_ndevs || 	    (sc = (struct clsoftc *) clcd.cd_devs[unit]) == NULL) {		return (ENODEV);	}	channel = CL_CHANNEL(dev);	cl = &sc->sc_cl[channel];	tp = cl->tty;	if (!tp)		return (ENXIO);	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));}