#include <db.h> int DB->get_partition_callback(DB *db, u_int32_t *partsp, u_int32_t (**callback_fcn) (DB *dbp, DBT *key);
        The DB->get_partition_callback() method
        returns the database partitioning callback as set by the 
        DB->set_partition()
        method.
    
         The DB->get_partition_callback() method
         may be called at any time during the life of the application.
    
         The DB->get_partition_callback() 
            
                  method returns a non-zero error value on failure and 0 on success.