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<title>Berkeley DB: DB->set_errcall</title>
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<h1>DB->set_errcall</h1>
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<h3><pre>
#include <db.h>
<p>
void
DB->set_errcall(DB *,
void (*db_errcall_fcn)(const char *errpfx, char *msg));
</pre></h3>
<h1>Description</h1>
<p>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 <a href="../api_c/env_set_errcall.html">DB_ENV->set_errcall</a> and DB->set_errcall methods are 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">DB_ENV->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">DB_ENV->set_errfile</a> methods 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>For <a href="../api_c/db_class.html">DB</a> handles opened inside of Berkeley DB environments, calling the
DB->set_errcall method affects the entire environment and is equivalent to calling
the <a href="../api_c/env_set_errcall.html">DB_ENV->set_errcall</a> method.
<p>The DB->set_errcall interface may be called at any time during the life of
the application.
<h1>Class</h1>
<a href="../api_c/db_class.html">DB</a>
<h1>See Also</h1>
<a href="../api_c/db_list.html">Databases and Related Methods</a>
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