tty_getctrlchar
c = tty_getctrlchar(tp, VSTART);
c = tty_getctrlchar(tp, VSTOP);
sg->sg_erase = tty_getctrlchar(tp, VERASE);
sg->sg_kill = tty_getctrlchar(tp, VKILL);
tc->t_intrc = tty_getctrlchar(tp, VINTR);
tc->t_quitc = tty_getctrlchar(tp, VQUIT);
tc->t_startc = tty_getctrlchar(tp, VSTART);
tc->t_stopc = tty_getctrlchar(tp, VSTOP);
tc->t_eofc = tty_getctrlchar(tp, VEOF);
tc->t_brkc = tty_getctrlchar(tp, VEOL);
ltc->t_suspc = tty_getctrlchar(tp, VSUSP);
ltc->t_dsuspc = tty_getctrlchar(tp, VDSUSP);
ltc->t_rprntc = tty_getctrlchar(tp, VREPRINT);
ltc->t_flushc = tty_getctrlchar(tp, VDISCARD);
ltc->t_werasc = tty_getctrlchar(tp, VWERASE);
ltc->t_lnextc = tty_getctrlchar(tp, VLNEXT);
unsigned char tty_getctrlchar(struct tty *, unsigned /*which*/);