+ if (!seat_is_vtconsole(s)) {
+ if (s->sessions)
+ return -EEXIST;
+
+ assert(!s->active);
+ s->active = session;
+ }
+
+ session->seat = s;
+ LIST_PREPEND(Session, sessions_by_seat, s->sessions, session);
+
+ return 0;
+}
+
+bool seat_is_vtconsole(Seat *s) {
+ assert(s);
+
+ return s->manager->vtconsole == s;
+}
+
+int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
+ Session *session;
+ bool idle_hint = true;
+ dual_timestamp ts = { 0, 0 };
+
+ assert(s);
+
+ LIST_FOREACH(sessions_by_seat, session, s->sessions) {
+ dual_timestamp k;
+ int ih;
+
+ ih = session_get_idle_hint(session, &k);
+ if (ih < 0)
+ return ih;
+
+ if (!ih) {
+ if (!idle_hint) {
+ if (k.monotonic < ts.monotonic)
+ ts = k;
+ } else {
+ idle_hint = false;
+ ts = k;
+ }
+ } else if (idle_hint) {
+
+ if (k.monotonic > ts.monotonic)
+ ts = k;
+ }
+ }
+
+ if (t)
+ *t = ts;
+
+ return idle_hint;