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<h1>DB_MPOOLFILE->set_pgcookie</h1>
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<h3><pre>
#include <db.h>
<p>
int
DB_MPOOLFILE->set_pgcookie(DB_MPOOLFILE *mpf, DBT *pgcookie);
</pre></h3>
<h1>Description</h1>
<p>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 <a href="../api_c/memp_register.html">DB_ENV->memp_register</a> documentation for more
information.)
<p>The DB_MPOOLFILE->set_pgcookie method configures a file in the memory pool, not only
operations performed using the specified <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a> handle.
<p>The DB_MPOOLFILE->set_pgcookie interface may not be called after the <a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a>
interface is called.
If the file is already open in the memory pool when
<a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a> is called, the information specified to DB_MPOOLFILE->set_pgcookie
will replace the existing information.
<p>The DB_MPOOLFILE->set_pgcookie method returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>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 <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a>
<h1>See Also</h1>
<a href="../api_c/memp_list.html">Memory Pools and Related Methods</a>
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