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<b>DB_ENV->set_errfile</b>
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<b><pre>
#include <db.h>
<p>
void
DB_ENV->set_errfile(DB_ENV *dbenv, FILE *errfile);
<p>
void
DB_ENV->get_errfile(DB_ENV *dbenv, FILE **errfilep);
</pre></b>
<hr size=1 noshade>
<b>Description: DB_ENV->set_errfile</b>
When an error occurs in the Berkeley DB library, a Berkeley DB error or an error
return value is returned by the interface. In some cases, however, the
return value may be insufficient to completely describe the cause of the
error especially during initial application debugging.
<p>The DB_ENV->set_errfile and <a href="../../db4-devel-4.7.25/api_c/db_set_errfile.html">DB->set_errfile</a> methods are used to
enhance the mechanism for reporting error messages to the application
by setting a C library FILE * to be used for displaying additional Berkeley DB
error messages. In some cases, when an error occurs, Berkeley DB will output
an additional error message to the specified file reference.</p>
<p>The error message will consist of the prefix string and a colon
("<b>:</b>") (if a prefix string was previously specified using
<a href="../../db4-devel-4.7.25/api_c/db_set_errpfx.html">DB->set_errpfx</a> or <a href="../../db4-devel-4.7.25/api_c/env_set_errpfx.html">DB_ENV->set_errpfx</a>), an error string, and
a trailing <newline> character.</p>
<p>The default configuration when applications first create <a href="../../db4-devel-4.7.25/api_c/db_class.html">DB</a> or
<a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a> handles is as if the DB_ENV->set_errfile or
<a href="../../db4-devel-4.7.25/api_c/db_set_errfile.html">DB->set_errfile</a> methods were called with the standard error output
(stderr) specified as the FILE * argument. Applications wanting no
output at all can turn off this default configuration by calling the
DB_ENV->set_errfile or <a href="../../db4-devel-4.7.25/api_c/db_set_errfile.html">DB->set_errfile</a> methods with NULL as the
FILE * argument. Additionally, explicitly configuring the error output
channel using any of the DB_ENV->set_errfile,
<a href="../../db4-devel-4.7.25/api_c/db_set_errfile.html">DB->set_errfile</a>, <a href="../../db4-devel-4.7.25/api_c/env_set_errcall.html">DB_ENV->set_errcall</a>,
<a href="../../db4-devel-4.7.25/api_c/db_set_errcall.html">DB->set_errcall</a>, <a href="../../db4-devel-4.7.25/api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> or
<a href="../../db4-devel-4.7.25/api_cxx/db_set_error_stream.html">Db::set_error_stream</a> methods will also turn off this default output
for the application.</p>
<p>This error logging enhancement does not slow performance or significantly
increase application size, and may be run during normal operation as well
as during application debugging.</p>
<p>The DB_ENV->set_errfile method configures operations performed using the specified
<a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a> handle, not all operations performed on the underlying
database environment.</p>
<p>The DB_ENV->set_errfile method may be called at any time during the life of the
application.</p>
<b>Parameters</b> <br>
<b>errfile</b><ul compact><li>The <b>errfile</b> parameter is a C library FILE * to be used for
displaying additional Berkeley DB error information.</ul>
<br>
<hr size=1 noshade>
<b>Description: DB_ENV->get_errfile</b>
<p>The DB_ENV->get_errfile method returns the FILE *.</p>
<p>The DB_ENV->get_errfile method may be called at any time during the life of the
application.</p>
<p>The DB_ENV->get_errfile method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>errfilep</b><ul compact><li>The DB_ENV->get_errfile method returns the
FILE * in <b>errfilep</b>.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a>
<br><b>See Also</b>
<a href="../../db4-devel-4.7.25/api_c/env_list.html">Database Environments and Related Methods</a>
</tt>
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