logind: add infrastructure to watch busnames

If we want to track bus-names to allow exclusive resource-access, we need
a way to get notified when a bus-name is gone. We make logind watch for
NameOwnerChanged dbus events and check whether the name is currently
watched. If it is, we remove it from the watch-list (notification for
other objects can be added in follow-up patches).

1 files changed, 4 insertions, 0 deletions

diff --git a/src/login/logind.h b/src/login/logind.h
index 1a97351fff..a76936da17 100644
--- a/src/login/logind.h
+++ b/src/login/logind.h
@@ -51,6 +51,7 @@ struct Manager {
         Hashmap *users;
         Hashmap *inhibitors;
         Hashmap *buttons;
+        Hashmap *busnames;
 
         LIST_HEAD(Seat, seat_gc_queue);
         LIST_HEAD(Session, session_gc_queue);
@@ -190,3 +191,6 @@ int manager_unit_is_active(Manager *manager, const char *unit);
 
 /* gperf lookup function */
 const struct ConfigPerfItem* logind_gperf_lookup(const char *key, unsigned length);
+
+int manager_watch_busname(Manager *manager, const char *name);
+void manager_drop_busname(Manager *manager, const char *name);