+ /**
+ * Repositions the underlying stream's position.
+ *
+ * This *optional* method repositions the underlying stream
+ * to a given absolute or relative position, as indicated by
+ * the whence directive.
+ *
+ * @param whence One of #bt_ctf_notif_iter_seek_whence values
+ * @param offset Offset to use for the given directive
+ * @param data User data
+ * @returns One of #bt_ctf_notif_iter_medium_status values
+ */
+ enum bt_ctf_notif_iter_medium_status (* seek)(
+ enum bt_ctf_notif_iter_seek_whence whence,
+ off_t offset, void *data);
+