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<pre class="programlisting">#include <db_cxx.h>
int DbMpoolFile::get_fileid(u_int8_t *fileid);</pre>
<p>
The <code class="methodname">DbMpoolFile::get_fileid()</code> method copies the
file's identifier into the memory location referenced by <span class="bold"><strong>fileid</strong></span>. The fileid specifies a unique
identifier for the file, which is used so that the cache functions
(that is, the shared memory buffer pool functions) are able to
uniquely identify files. This is necessary for multiple processes
wanting to share a file to correctly identify the file in the
cache.
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The <code class="methodname">DbMpoolFile::get_fileid()</code> <span>
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method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
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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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>,
<a class="xref" href="mempset_fileid.html" title="DbMpoolFile::set_fileid()">DbMpoolFile::set_fileid()</a>
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