int seat_preallocate_vts(Seat *s);
int seat_attach_session(Seat *s, Session *session);
int seat_preallocate_vts(Seat *s);
int seat_attach_session(Seat *s, Session *session);
bool seat_is_seat0(Seat *s);
bool seat_can_multi_session(Seat *s);
bool seat_can_tty(Seat *s);
bool seat_is_seat0(Seat *s);
bool seat_can_multi_session(Seat *s);
bool seat_can_tty(Seat *s);