handle empty sessions

[lttng-tools.git] / src / bin / lttng-sessiond / session.h

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index 14ad7af0a8aac4aeb55fb3f444dd9bb3fe39e639..41a894079e5244b131b9c6cc76c1f18c9f8bfd5b 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -54,6 +54,20 @@ struct ltt_session_list {
        struct cds_list_head head;
 };
 
+struct ltt_session_chunk {
+       /*
+        * When the rotation is in progress, the temporary path name is
+        * stored here. When the rotation is complete, the final path name
+        * is here and can be queried with the rotate_pending call.
+        */
+       char current_rotate_path[PATH_MAX];
+       /*
+        * The path where the consumer is currently writing after the first
+        * session rotation.
+        */
+       char active_tracing_path[PATH_MAX];
+};
+
 /*
  * This data structure contains information needed to identify a tracing
  * session for both LTTng and UST.
@@ -108,7 +122,46 @@ struct ltt_session {
        /*
         * Timer set when the session is created for live reading.
         */
-       int live_timer;
+       unsigned int live_timer;
+       /*
+        * Path where to keep the shared memory files.
+        */
+       char shm_path[PATH_MAX];
+       /*
+        * Node in ltt_sessions_ht_by_id.
+        */
+       struct lttng_ht_node_u64 node;
+       /*
+        * Number of session rotation for this session.
+        */
+       uint64_t rotate_count;
+       unsigned int rotate_pending:1;
+       enum lttng_rotate_status rotate_status;
+       /*
+        * Number of channels waiting for a rotate.
+        * When this number reaches 0, we can handle the rename of the chunk
+        * folder and inform the client that the rotate is finished.
+        *
+        * TODO: replace rotate_pending checks by that.
+        */
+       unsigned int nr_chan_rotate_pending;
+       struct ltt_session_chunk rotation_chunk;
+       /*
+        * The timestamp of the beginning of the previous chunk. For the
+        * first chunk, this is the "lttng start" timestamp. For the
+        * subsequent ones, this copies the current_chunk_start_ts value when
+        * a new rotation starts. This value is used to set the name of a
+        * complete chunk directory, ex: "last_chunk_start_ts-now()".
+        */
+       time_t last_chunk_start_ts;
+       /*
+        * This is the timestamp when a new chunk starts. When a new rotation
+        * starts, we copy this value to last_chunk_start_ts and override it
+        * with the current timestamp.
+        */
+       time_t current_chunk_start_ts;
+       time_t session_last_stop_ts;
+       time_t last_begin_rotation_ts;
 };
 
 /* Prototypes */
@@ -121,6 +174,7 @@ void session_unlock(struct ltt_session *session);
 void session_unlock_list(void);
 
 struct ltt_session *session_find_by_name(const char *name);
+struct ltt_session *session_find_by_id(uint64_t id);
 struct ltt_session_list *session_get_list(void);
 
 int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);