+int seat_set_active(Seat *s, Session *session) {
+ Session *old_active;
+
+ assert(s);
+ assert(!session || session->seat == s);
+
+ if (session == s->active)
+ return 0;
+
+ old_active = s->active;
+ s->active = session;
+
+ seat_apply_acls(s, old_active);
+
+ if (session && session->started)
+ session_send_changed(session, "Active\0");
+
+ if (!session || session->started)
+ seat_send_changed(s, "ActiveSession\0");
+
+ seat_save(s);
+
+ if (session) {
+ session_save(session);
+ user_save(session->user);
+ }
+
+ if (old_active) {
+ session_save(old_active);
+ user_save(old_active->user);
+ }
+
+ return 0;
+}
+