# DbEnv::memp_fcreate

`

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    #include <db_cxx.h>

    int
    DbEnv::memp_fcreate(DbMpoolFile **dbmfp, u_int32_t flags);

# Description

The DbEnv::memp_fcreate method creates a DbMpoolFile structure that is the handle for a Berkeley DB shared memory buffer pool file. A pointer to this structure is returned in the memory to which dbmfp refers. Calling the DbMpoolFile::close method will discard the returned handle.

The flags parameter is currently unused, and must be set to 0.

The DbEnv::memp_fcreate method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

# Errors

The DbEnv::memp_fcreate method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv::memp_fcreate method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv, DbMpoolFile

# See Also

DbEnv::set_cachesize, DbEnv::set_mp_mmapsize, DbEnv::memp_fcreate, DbMpoolFile::close, DbMpoolFile::get, DbMpoolFile::open, DbMpoolFile::put, DbMpoolFile::set, DbMpoolFile::sync, DbEnv::memp_register, DbMpoolFile::set_clear_len, DbMpoolFile::set_fileid, DbMpoolFile::set_ftype, DbMpoolFile::set_lsn_offset, DbMpoolFile::set_pgcookie, DbEnv::memp_stat, DbEnv::memp_sync, and DbEnv::memp_trickle.`

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