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<!--$Id: env_set_errcall.so,v 10.16 1999/12/20 08:52:29 bostic Exp $-->
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<h1>DBENV->set_errcall</h1>
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<h3><pre>
#include <db.h>
<p>
void
DBENV->set_errcall(DB_ENV *dbenv,
void (*db_errcall_fcn)(const char *errpfx, char *msg));
</pre></h3>
<h1>Description</h1>
When an error occurs in the Berkeley DB library, a Berkeley DB error or an error
return value is returned by the function. In some cases, however,
the <b>errno</b> value may be insufficient to completely describe
the cause of the error especially during initial application debugging.
<p>The DBENV->set_errcall function is used to enhance the mechanism for reporting error
messages to the application. In some cases, when an error occurs, Berkeley DB
will call <b>db_errcall_fcn</b> with additional error information. The
function must be declared with two arguments; the first will be the prefix
string (as previously set by <a href="../api_c/db_set_errpfx.html">DB->set_errpfx</a> or
<a href="../api_c/env_set_errpfx.html">DBENV->set_errpfx</a>), the second will be the error message string.
It is up to the <b>db_errcall_fcn</b> function to display the error
message in an appropriate manner.
<p>Alternatively, you can use the <a href="../api_c/db_set_errfile.html">DB->set_errfile</a> or
<a href="../api_c/env_set_errfile.html">DBENV->set_errfile</a> functions to display the additional information
via a C library FILE *.
<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>The DBENV->set_errcall interface may be used to configure Berkeley DB at any time
during the life of the application.
<h1>See Also</h1>
<a href="../api_c/env_close.html">DBENV->close</a>,
<a href="../api_c/env_create.html">db_env_create</a>,
<a href="../api_c/env_open.html">DBENV->open</a>,
<a href="../api_c/env_remove.html">DBENV->remove</a>,
<a href="../api_c/db_err.html">DBENV->err</a>,
<a href="../api_c/env_strerror.html">db_strerror</a>,
<a href="../api_c/env_version.html">db_version</a>,
<a href="../api_c/env_set_cachesize.html">DBENV->set_cachesize</a>,
<a href="../api_c/env_set_errcall.html">DBENV->set_errcall</a>,
<a href="../api_c/env_set_errfile.html">DBENV->set_errfile</a>,
<a href="../api_c/env_set_errpfx.html">DBENV->set_errpfx</a>,
<a href="../api_c/env_set_flags.html">DBENV->set_flags</a>,
<a href="../api_c/env_set_mutexlocks.html">DBENV->set_mutexlocks</a>,
<a href="../api_c/env_set_paniccall.html">DBENV->set_paniccall</a>,
and
<a href="../api_c/env_set_verbose.html">DBENV->set_verbose</a>.
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