wwsettty
(void) wwsettty(0, &wwnewtty);
int wwsettty(int, struct ww_tty *);
(void) wwsettty(0, &wwoldtty);
if (wwsettty(i, &wwwintty) < 0)
if (wwsettty(0, &wwnewtty) < 0)
(void) wwsettty(0, &wwoldtty);
(void) wwsettty(0, &wwnewtty);