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80 lines
4.2 KiB
HTML
<!--$Id: db_set_errcall.so,v 10.7 1999/12/20 08:52:28 bostic Exp $-->
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<!--$Id: m4.errset,v 10.8 2000/02/19 20:57:57 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: Db::set_errcall</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>Db::set_errcall</h1>
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</td>
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<td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db_cxx.h>
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<p>
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void Db::set_errcall(
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void (*db_errcall_fcn)(const char *errpfx, char *msg));
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</pre></h3>
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<h1>Description</h1>
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When an error occurs in the Berkeley DB library, an exception is thrown or an
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error return value is returned by the method. In some cases,
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however, the <b>errno</b> value may be insufficient to completely
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describe the cause of the error, especially during initial application
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debugging.
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<p>The Db::set_errcall method is used to enhance the mechanism for reporting error
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messages to the application. In some cases, when an error occurs, Berkeley DB
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will call <b>db_errcall_fcn</b> with additional error information. The
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function must be defined with two arguments; the first will be the prefix
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string (as previously set by <a href="../api_cxx/db_set_errpfx.html">Db::set_errpfx</a> or
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>), the second will be the error message string.
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It is up to the <b>db_errcall_fcn</b> method to display the error
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message in an appropriate manner.
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<p>Alternatively, you can use the <a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a> method to display
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the additional information via an output stream, or the <a href="../api_cxx/db_set_errfile.html">Db::set_errfile</a>
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or <a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a> methods to display the additional information via a C
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library FILE *. You should not mix these approaches.
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<p>This error logging enhancement does not slow performance or significantly
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increase application size, and may be run during normal operation as well
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as during application debugging.
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<p>For <a href="../api_cxx/db_class.html">Db</a> handles opened inside of Berkeley DB environments, calling the
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Db::set_errcall method affects the entire environment and is equivalent to calling
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the <a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a> method.
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<p>The Db::set_errcall interface may be used to configure Berkeley DB at any time
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during the life of the application.
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<h3>Class</h3>
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<a href="../api_cxx/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_cxx/env_close.html">DbEnv::close</a>,
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<a href="../api_cxx/env_open.html">DbEnv::open</a>,
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<a href="../api_cxx/env_remove.html">DbEnv::remove</a>,
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<a href="../api_cxx/db_err.html">DbEnv::err</a>,
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<a href="../api_cxx/env_strerror.html">DbEnv::strerror</a>,
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<a href="../api_cxx/env_version.html">DbEnv::version</a>,
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<a href="../api_cxx/env_set_cachesize.html">DbEnv::set_cachesize</a>,
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<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>,
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<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>,
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<a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a>,
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<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>,
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<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a>,
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<a href="../api_cxx/env_set_mutexlocks.html">DbEnv::set_mutexlocks</a>,
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<a href="../api_cxx/env_set_paniccall.html">DbEnv::set_paniccall</a>,
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and
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<a href="../api_cxx/env_set_verbose.html">DbEnv::set_verbose</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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