#include <db.h> int DB_ENV->get_blob_dir(DB_ENV *dbenv, const char **dirp);
         The DB_ENV->get_blob_dir() method returns
         the directory location where blob data is stored. The default
         location can be set using DB_ENV->set_blob_dir(). Use this method only
         if the database was opened in an environment. If the database
         was not opened within an encompassing environment, use
         DB->get_blob_dir() instead.
     
         The DB_ENV->get_blob_dir() method always returns
         0 to indicate success.
    
The dirp parameter references memory into which is copied the path to the BLOB data directory. If DB_ENV->set_blob_dir() has not been called prior to calling this method, or if BLOBS are not supported by this environment, then this parameter is set to NULL.