#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.