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<title>Berkeley DB: DB_MPOOLFILE->set_lsn_offset</title>
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<h1>DB_MPOOLFILE->set_lsn_offset</h1>
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<h3><pre>
#include <db.h>
<p>
int
DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset);
</pre></h3>
<h1>Description</h1>
<p>The DB_MPOOLFILE->set_lsn_offset method specifies the zero-based byte offset
of a log sequence number (<a href="../api_c/lsn_class.html">DB_LSN</a>) on the file's pages, for the
purposes of page-flushing as part of transaction checkpoint. (See the
<a href="../api_c/memp_sync.html">DB_ENV->memp_sync</a> documentation for more information.)
<p>The DB_MPOOLFILE->set_lsn_offset 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_lsn_offset 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_lsn_offset
must be consistent with the existing file or an error will be
returned.
<p>The DB_MPOOLFILE->set_lsn_offset method returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>The DB_MPOOLFILE->set_lsn_offset 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_lsn_offset 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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