* key the key used to lookup cache files
* ttl max cache time in seconds for this key
* fn content generator function for this key
* key the key used to lookup cache files
* ttl max cache time in seconds for this key
* fn content generator function for this key
*/
extern int cache_process(int size, const char *path, const char *key, int ttl,
*/
extern int cache_process(int size, const char *path, const char *key, int ttl,