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<p>Library Version 18.1.40</p>
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<p>
Normally, when an error occurs in the Berkeley DB library,
an integer value (either a Berkeley DB specific value or a
system <code class="literal">errno</code> value) is returned by Berkeley
DB. In some cases, however, this value may be insufficient to
completely describe the cause of the error, especially during
initial application debugging.
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Most Berkeley DB errors will result in additional
information being written to a standard file descriptor or
output stream. Additionally, Berkeley DB can be configured to
pass these verbose error messages to an application function.
There are four methods intended to provide applications with
additional error information: <a href="../api_reference/C/envset_errcall.html" class="olink">DB_ENV->set_errcall()</a>,
<a href="../api_reference/C/envset_errfile.html" class="olink">DB_ENV->set_errfile()</a>, <a href="../api_reference/C/envset_errpfx.html" class="olink">DB_ENV->set_errpfx()</a> and <a href="../api_reference/C/envset_verbose.html" class="olink">DB_ENV->set_verbose()</a>.
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The Berkeley DB error-reporting facilities do not slow
performance or significantly increase application size, and
may be run during normal operation as well as during
debugging. Where possible, we recommend these options always
be configured and the output saved in the filesystem. We have
found that this often saves time when debugging installation
or other system-integration problems.
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In addition, there are three methods to assist applications
in displaying their own error messages: <a href="../api_reference/C/envstrerror.html" class="olink">db_strerror()</a>,
<a href="../api_reference/C/enverr.html" class="olink">DB_ENV->err()</a>, and <code class="methodname">DB_ENV->errx()</code>. The
first is a superset of the ANSI C strerror function, and
returns a descriptive string for any error return from the
Berkeley DB library. The <a href="../api_reference/C/enverr.html" class="olink">DB_ENV->err()</a> and
<code class="methodname">DB_ENV->errx()</code> methods use the
error message configuration options described previously to
format and display error messages to appropriate output
devices.
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