#include <db.h>
int
DB_ENV->memp_fcreate(DB_ENV *dbenvp, DB_MPOOLFILE **dbmfp, 
                     u_int32_t flags);  
      
        The DB_ENV->memp_fcreate() method creates a 
        DB_MPOOLFILE  structure that is the handle for a Berkeley DB
        cache (that is, a shared memory buffer pool file).  A pointer to this structure is returned in the memory to
        which dbmfp refers. Calling the 
        DB_MPOOLFILE->close()  method will discard the returned handle.
    
         The DB_ENV->memp_fcreate() 
            
                  method returns a non-zero error value on failure and 0 on success.