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<title>DbMpoolFile::get_fileid()</title>
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<th colspan="3" align="center">DbMpoolFile::get_fileid()</th>
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<td width="20%" align="left"><a accesskey="p" href="mempget_clear_len.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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The DbMpoolFile Handle
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<h2 class="title" style="clear: both"><a id="mempget_fileid"></a>DbMpoolFile::get_fileid()</h2>
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<pre class="programlisting">#include <db_cxx.h>
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int DbMpoolFile::get_fileid(u_int8_t *fileid);</pre>
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<p>
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The <code class="methodname">DbMpoolFile::get_fileid()</code> method copies the
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file's identifier into the memory location referenced by <span class="bold"><strong>fileid</strong></span>. The fileid specifies a unique
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identifier for the file, which is used so that the cache functions
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(that is, the shared memory buffer pool functions) are able to
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uniquely identify files. This is necessary for multiple processes
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wanting to share a file to correctly identify the file in the
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cache.
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</p>
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<p>
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The <code class="methodname">DbMpoolFile::get_fileid()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a>
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<h3 class="title"><a id="id3629924"></a>See Also</h3>
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</div>
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</div>
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<p>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>,
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<a class="xref" href="mempset_fileid.html" title="DbMpoolFile::set_fileid()">DbMpoolFile::set_fileid()</a>
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<td width="40%" align="left" valign="top">DbMpoolFile::get_clear_len() </td>
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<td width="40%" align="right" valign="top"> DbMpoolFile::get_flags()</td>
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