int rate_to_value (value_t *ret_value, gauge_t rate,
rate_to_value_state_t *state, int ds_type, cdtime_t t);
-int value_to_rate (value_t *ret_rate, derive_t value,
- value_to_rate_state_t *state, int ds_type, cdtime_t t);
+int value_to_rate (gauge_t *ret_rate, value_t value, int ds_type, cdtime_t t,
+ value_to_rate_state_t *state);
/* Converts a service name (a string) to a port number
* (in the range [1-65535]). Returns less than zero on error. */