int uc_set_hits(const data_set_t *ds, const value_list_t *vl, int hits);
int uc_inc_hits(const data_set_t *ds, const value_list_t *vl, int step);
+int uc_set_callbacks_mask(const char *name, unsigned long callbacks_mask);
+
int uc_get_history(const data_set_t *ds, const value_list_t *vl,
gauge_t *ret_history, size_t num_steps, size_t num_ds);
int uc_get_history_by_name(const char *name, gauge_t *ret_history,