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<title>Berkeley DB: DbEnv::log_file</title>
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<h1>DbEnv::log_file</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::log_file(const DbLsn *lsn, char *namep, size_t len);
</pre></h3>
<h1>Description</h1>
<p>The DbEnv::log_file method maps
<a href="../api_cxx/lsn_class.html">DbLsn</a> objects
to filenames,
copying the name of the file containing the record named by <b>lsn</b>
into the memory location to which <b>namep</b> refers.
<p>The <b>len</b> argument is the length of the <b>namep</b> buffer in bytes.
If <b>namep</b> is too short to hold the filename, DbEnv::log_file will
return ENOMEM.
(Log filenames are normally quite short, on the order of 10 characters.)
<p>This mapping of
<a href="../api_cxx/lsn_class.html">DbLsn</a> objects
to files is needed for database administration. For example, a
transaction manager typically records the earliest
<a href="../api_cxx/lsn_class.html">DbLsn</a>
needed for restart, and the database administrator may want to archive
log files to tape when they contain only
<a href="../api_cxx/lsn_class.html">DbLsn</a>
entries before the earliest one needed for restart.
<p>The DbEnv::log_file 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.
<h1>Errors</h1>
<p>The DbEnv::log_file method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>ENOMEM<dd>The supplied buffer was too small to hold the log filename.
</dl>
<p>The DbEnv::log_file method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv::log_file method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/logc_class.html">DbLogc</a>, <a href="../api_cxx/lsn_class.html">DbLsn</a>
<h1>See Also</h1>
<a href="../api_cxx/log_list.html">Logging Subsystem and Related Methods</a>
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