service: Add callbacks to track state changes

Extend the btd_service API to support state observers.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/service.h b/src/service.h
index e3bc6e5d1..6ee8f17f9 100644
--- a/src/service.h
+++ b/src/service.h
@@ -33,6 +33,11 @@ struct btd_service;
 struct btd_device;
 struct btd_profile;
 
+typedef void (*btd_service_state_cb) (struct btd_service *service,
+						btd_service_state_t old_state,
+						btd_service_state_t new_state,
+						void *user_data);
+
 struct btd_service *btd_service_ref(struct btd_service *service);
 void btd_service_unref(struct btd_service *service);
 
@@ -53,6 +58,10 @@ struct btd_profile *btd_service_get_profile(const struct btd_service *service);
 btd_service_state_t btd_service_get_state(const struct btd_service *service);
 int btd_service_get_error(const struct btd_service *service);
 
+unsigned int btd_service_add_state_cb(btd_service_state_cb cb,
+							void *user_data);
+bool btd_service_remove_state_cb(unsigned int id);
+
 /* Functions used by profile implementation */
 void btd_service_connecting_complete(struct btd_service *service, int err);
 void btd_service_disconnecting_complete(struct btd_service *service, int err);