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76 lines
3.9 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_c/c_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.h>
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<p>
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void
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DB->set_errcall(DB *,
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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, a Berkeley DB error or an error
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return value is returned by the function. In some cases, however,
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the <b>errno</b> value may be insufficient to completely describe
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the cause of the error especially during initial application debugging.
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<p>The DB->set_errcall function 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 declared with two arguments; the first will be the prefix
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string (as previously set by <a href="../api_c/db_set_errpfx.html">DB->set_errpfx</a> or
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<a href="../api_c/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> function 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_c/db_set_errfile.html">DB->set_errfile</a> or
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<a href="../api_c/env_set_errfile.html">DBENV->set_errfile</a> functions to display the additional information
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via a C library FILE *.
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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 DB handles opened inside of Berkeley DB environments, calling the
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DB->set_errcall function affects the entire environment and is equivalent to calling
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the <a href="../api_c/env_set_errcall.html">DBENV->set_errcall</a> function.
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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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<h1>See Also</h1>
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<a href="../api_c/env_close.html">DBENV->close</a>,
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<a href="../api_c/env_create.html">db_env_create</a>,
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<a href="../api_c/env_open.html">DBENV->open</a>,
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<a href="../api_c/env_remove.html">DBENV->remove</a>,
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<a href="../api_c/db_err.html">DBENV->err</a>,
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<a href="../api_c/env_strerror.html">db_strerror</a>,
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<a href="../api_c/env_version.html">db_version</a>,
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<a href="../api_c/env_set_cachesize.html">DBENV->set_cachesize</a>,
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<a href="../api_c/env_set_errcall.html">DBENV->set_errcall</a>,
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<a href="../api_c/env_set_errfile.html">DBENV->set_errfile</a>,
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<a href="../api_c/env_set_errpfx.html">DBENV->set_errpfx</a>,
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<a href="../api_c/env_set_flags.html">DBENV->set_flags</a>,
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<a href="../api_c/env_set_mutexlocks.html">DBENV->set_mutexlocks</a>,
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<a href="../api_c/env_set_paniccall.html">DBENV->set_paniccall</a>,
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and
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<a href="../api_c/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_c/c_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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