API : seek by timestamp

[babeltrace.git] / include / babeltrace / iterator.h

diff --git a/include/babeltrace/iterator.h b/include/babeltrace/iterator.h
index 1de2809b88a8562715689cb33d903b5c91d0deb9..0acd91d431b2a98e59c7ad2e43c395dfc53166e2 100644 (file)
--- a/include/babeltrace/iterator.h
+++ b/include/babeltrace/iterator.h
@@ -69,13 +69,13 @@ void bt_iter_destroy(struct bt_iter *iter);
 int bt_iter_next(struct bt_iter *iter);
 
 /*
- * bt_iter_save_pos - Save the current trace collection position.
+ * bt_iter_get_pos - Get the current iterator position.
  *
  * The position returned by this function needs to be freed by
  * bt_iter_free_pos after use.
  */
 struct bt_iter_pos *
-       bt_iter_save_pos(struct bt_iter *iter);
+       bt_iter_get_pos(struct bt_iter *iter);
 
 /*
  * bt_iter_free_pos - Free the position.
@@ -83,14 +83,28 @@ struct bt_iter_pos *
 void bt_iter_free_pos(struct bt_iter_pos *pos);
 
 /*
- * bt_iter_seek: seek iterator to given position.
+ * bt_iter_set_pos: move the iterator to a given position.
+ *
+ * On error, the stream_heap is reinitialized and returned empty.
  *
- * Return EOF if position is after the last event of the trace collection.
- * Return other negative value for other errors.
  * Return 0 for success.
+ *
+ * Return EOF if the position requested is after the last event of the
+ * trace collection.
+ * Return -EINVAL when called with invalid parameter.
+ * Return -ENOMEM if the stream_heap could not be properly initialized.
+ */
+int bt_iter_set_pos(struct bt_iter *iter, const struct bt_iter_pos *pos);
+
+/*
+ * bt_iter_create_time_pos: create a position based on time
+ *
+ * This function allocates and returns a new bt_iter_pos (which must be freed
+ * with bt_iter_free_pos) to be able to restore an iterator position based on a
+ * timestamp.
  */
-int bt_iter_seek(struct bt_iter *iter,
-               const struct bt_iter_pos *pos);
+struct bt_iter_pos *bt_iter_create_time_pos(struct bt_iter *iter,
+               uint64_t timestamp);
 
 /*
  * bt_iter_read_event: Read the iterator's current event data.