-struct ltt_session {
- int active; /* Is trace session active ? */
- int been_active; /* Has trace session been active ? */
- int objd; /* Object associated to session */
- struct ltt_channel *metadata; /* Metadata channel */
- struct cds_list_head chan; /* Channel list head */
- struct cds_list_head events; /* Event list head */
- struct cds_list_head list; /* Session list */
- unsigned int free_chan_id; /* Next chan ID to allocate */
- uuid_t uuid; /* Trace session unique ID */
+/*
+ * IMPORTANT: this structure is part of the ABI between the probe and
+ * UST. Fields need to be only added at the end, never reordered, never
+ * removed.
+ */
+struct lttng_session {
+ int active; /* Is trace session active ? */
+ int been_active; /* Been active ? */
+ int objd; /* Object associated */
+ struct lttng_channel *metadata; /* Metadata channel */
+ struct cds_list_head chan_head; /* Channel list head */
+ struct cds_list_head events_head; /* list of events */
+ struct cds_list_head _deprecated1;
+ struct cds_list_head node; /* Session list */
+ unsigned int free_chan_id; /* Next chan ID to allocate */
+ unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */