+bool seat_has_vts(Seat *s) {
+ assert(s);
+
+ return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
+}
+
+bool seat_is_seat0(Seat *s) {
+ assert(s);
+
+ return s->manager->seat0 == s;
+}
+
+bool seat_can_multi_session(Seat *s) {
+ assert(s);
+
+ return seat_has_vts(s);
+}
+
+bool seat_can_tty(Seat *s) {
+ assert(s);
+
+ return seat_has_vts(s);
+}
+
+bool seat_has_master_device(Seat *s) {
+ assert(s);
+
+ /* device list is ordered by "master" flag */
+ return !!s->devices && s->devices->master;
+}
+
+bool seat_can_graphical(Seat *s) {