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<h1>DbEnv::set_errcall</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
void DbEnv::set_errcall(
void (*db_errcall_fcn)(const char *errpfx, char *msg));
</pre></h3>
<h1>Description</h1>
When an error occurs in the Berkeley DB library, an exception is thrown or an
error return value is returned by the method. 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 and <a href="../api_cxx/db_set_errcall.html">Db::set_errcall</a> 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 defined with two arguments; the first will be the prefix string
(as previously set by <a href="../api_cxx/db_set_errpfx.html">Db::set_errpfx</a> or <a href="../api_cxx/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> method to display the error message in an
appropriate manner.
<p>Alternatively, you can use the <a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> and
<a href="../api_cxx/db_set_error_stream.html">Db::set_error_stream</a> methods to display the additional information via
an output stream, or the <a href="../api_cxx/db_set_errfile.html">Db::set_errfile</a> or
<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a> methods to display the additional information via a C
library FILE *. You should not mix these approaches.
<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 called at any time during the life of
the application.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
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