<!--$Id: env_set_errcall.so,v 10.33 2003/11/08 19:17:29 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->set_errcall</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>DB_ENV->set_errcall</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_c/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> void DB_ENV->set_errcall(DB_ENV *dbenv, void (*db_errcall_fcn)(const char *errpfx, char *msg)); </pre></h3> <hr size=1 noshade> <h3>Description: DB_ENV->set_errcall</h3> <p>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 <b>errno</b> value may be insufficient to completely describe the cause of the error, especially during initial application debugging.</p> <p>The DB_ENV->set_errcall and <a href="../../db42-devel-4.2.52/api_c/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. It is up to the <b>db_errcall_fcn</b> function to display the error message in an appropriate manner.</p> <p>Alternatively, you can use the <a href="../../db42-devel-4.2.52/api_c/db_set_errfile.html">DB->set_errfile</a> or <a href="../../db42-devel-4.2.52/api_c/env_set_errfile.html">DB_ENV->set_errfile</a> methods to display the additional information via a C library FILE *.</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_errcall method may be called at any time during the life of the application.</p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>db_errcall_fcn</b><dd> The <b>db_errcall_fcn</b> parameter is the application-specified error reporting function. The function takes two parameters: <p><dl compact> <p><dt><b>errpfx</b><dd>The <b>errpfx</b> parameter is the prefix string (as previously set by <a href="../../db42-devel-4.2.52/api_c/db_set_errpfx.html">DB->set_errpfx</a> or <a href="../../db42-devel-4.2.52/api_c/env_set_errpfx.html">DB_ENV->set_errpfx</a>). <p><dt><b>msg</b><dd>The <b>msg</b> parameter is the error message string. </dl> </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_c/env_class.html">DB_ENV</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_c/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_c/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>