2011-09-13 17:44:24 +00:00
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<title>DbEnv::log_file()</title>
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="lsn.html" title="Chapter 8. The DbLsn Handle" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DbEnv::log_file()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="logcursor.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 8.
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The DbLsn Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="logflush.html">Next</a></td>
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<div class="titlepage">
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<div>
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<h2 class="title" style="clear: both"><a id="logfile"></a>DbEnv::log_file()</h2>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::log_file(const DbLsn *lsn, char *namep, size_t len);</pre>
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<p>
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The <code class="methodname">DbEnv::log_file()</code> method maps
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<code class="classname">DbLsn</code> structures to filenames,
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returning the name of the file containing the record named by
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<span class="bold"><strong>lsn</strong></span>.
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</p>
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<p>
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This mapping of <code class="classname">DbLsn</code> structures to files is needed for database
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administration. For example, a transaction manager typically records
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the earliest <a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
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needed for restart, and the database administrator may want to archive
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log files to tape when they contain only
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<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a> entries before the
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earliest one needed for restart.
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</p>
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<p>
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The <code class="methodname">DbEnv::log_file()</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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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3618840"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3618830"></a>lsn</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>lsn</strong></span> parameter is the
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<code class="classname">DbLsn</code> structure for which a
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filename is wanted.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3618449"></a>namep</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>namep</strong></span> parameter references memory
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into which the name of the file containing the record named by
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<span class="bold"><strong>lsn</strong></span> is copied.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3618145"></a>len</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>len</strong></span> parameter is the length of
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the <span class="bold"><strong>namep</strong></span> buffer in bytes. If
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<span class="bold"><strong>namep</strong></span> is too short to hold the
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filename, <code class="methodname">DbEnv::log_file()</code> will fail. (Log filenames
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are always 14 characters long.)
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3618348"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::log_file()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3618981"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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If supplied buffer was too small to hold the log filename;
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or if an invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3618955"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
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<a class="link" href="logc.html" title="The DbLogc Handle">DbLogc</a>,
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<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3619022"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
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</p>
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<td width="40%" align="left" valign="top">DbEnv::log_cursor() </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DbEnv::log_flush()</td>
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