_db_open
ret = _db_open(&db1, &fr, _CITRUS_PIVOT_MAGIC, _db_hash_std, NULL);
ret = _db_open(subdb, &r, _CITRUS_PIVOT_SUB_MAGIC, _db_hash_std, NULL);
ret = _db_open(&db, fr, _CITRUS_ESDB_MAGIC, &_db_hash_std, NULL);
ret = _db_open(&cl->cl_db, &r, _CITRUS_LOOKUP_MAGIC,
ret = _db_open(&ms->ms_db, &ms->ms_file, _CITRUS_MAPPER_STD_MAGIC,