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23              The  DB_MPOOLFILE Handle
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38      <pre class="programlisting">#include &lt;db.h&gt;
39
40int
41DB_MPOOLFILE-&gt;get_fileid(DB_MPOOLFILE *mpf, u_int8_t *fileid);  </pre>
42      <p>
43         The <code class="methodname">DB_MPOOLFILE-&gt;get_fileid()</code> method copies the
44         file's identifier into the memory location referenced by <span class="bold"><strong>fileid</strong></span>. The fileid specifies a unique
45         identifier for the file, which is used so that the cache functions
46         (that is, the shared memory buffer pool functions) are able to
47         uniquely identify files. This is necessary for multiple processes
48         wanting to share a file to correctly identify the file in the
49         cache.
50    </p>
51      <p>
52         The <code class="methodname">DB_MPOOLFILE-&gt;get_fileid()</code> <span>
53            <span>
54                  method returns a non-zero error value on failure and 0 on success.
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80                        <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>,
81                        <a class="xref" href="mempset_fileid.html" title="DB_MPOOLFILE-&gt;set_fileid()">DB_MPOOLFILE-&gt;set_fileid()</a>
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