dzparam
tp->t_param = dzparam;
(void)dzparam(tp, &tp->t_termios);
static int dzparam(struct tty *, struct termios *);
static int dzparam(struct tty *, struct termios *);
tp->t_param = dzparam;
(void) dzparam(tp, &tp->t_termios);
dzparam(tp, &tp->t_termios);