int rrd_fetch(int, char **, time_t *, time_t *, unsigned long *,
unsigned long *, char ***, rrd_value_t **);
int rrd_restore(int, char **);
int rrd_fetch(int, char **, time_t *, time_t *, unsigned long *,
unsigned long *, char ***, rrd_value_t **);
int rrd_restore(int, char **);