# Berkeley DB: DB_MPOOLFILE->set_pgcookie
Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DB_MPOOLFILE->set_pgcookie

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    #include <db.h>

    int
    DB_MPOOLFILE->set_pgcookie(DB_MPOOLFILE *mpf, DBT *pgcookie);

# Description

The DB_MPOOLFILE->set_pgcookie method specifies a byte string that is provided to the functions registered to do input or output processing of the file's pages as they are read from or written to, the backing filesystem store. (See the DB_ENV->memp_register documentation for more information.)

The DB_MPOOLFILE->set_pgcookie method configures a file in the memory pool, not only operations performed using the specified DB_MPOOLFILE handle.

The DB_MPOOLFILE->set_pgcookie interface may not be called after the DB_MPOOLFILE->open interface is called. If the file is already open in the memory pool when DB_MPOOLFILE->open is called, the information specified to DB_MPOOLFILE->set_pgcookie will replace the existing information.

The DB_MPOOLFILE->set_pgcookie method returns a non-zero error value on failure and 0 on success.

# Errors

The DB_MPOOLFILE->set_pgcookie method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_MPOOLFILE->set_pgcookie method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB_ENV, DB_MPOOLFILE

# See Also

Memory Pools and Related Methods`

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