+ data_set_t *ds_copy;
+ int i;
+
+ if (llist_search (list_data_set, ds->type) != NULL)
+ {
+ NOTICE ("Replacing DS `%s' with another version.", ds->type);
+ plugin_unregister_data_set (ds->type);
+ }
+
+ ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
+ if (ds_copy == NULL)
+ return (-1);
+ memcpy(ds_copy, ds, sizeof (data_set_t));
+
+ ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
+ * ds->ds_num);
+ if (ds_copy->ds == NULL)
+ {
+ free (ds_copy);
+ return (-1);
+ }
+
+ for (i = 0; i < ds->ds_num; i++)
+ memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
+
+ return (register_callback (&list_data_set, ds->type, (void *) ds_copy));