int seat_switch_to_previous(Seat *s);
int seat_active_vt_changed(Seat *s, unsigned int vtnr);
int seat_read_active_vt(Seat *s);
int seat_switch_to_previous(Seat *s);
int seat_active_vt_changed(Seat *s, unsigned int vtnr);
int seat_read_active_vt(Seat *s);