2011-09-13 17:44:24 +00:00
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<title>DB->set_msgcall()</title>
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<link rel="up" href="db.html" title="Chapter 2. The DB Handle" />
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<link rel="prev" href="dbset_lorder.html" title="DB->set_lorder()" />
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<link rel="next" href="dbset_msgfile.html" title="DB->set_msgfile()" />
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB->set_msgcall()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbset_lorder.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The DB Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbset_msgfile.html">Next</a></td>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="dbset_msgcall"></a>DB->set_msgcall()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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void
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DB->set_msgcall(DB *,
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void (*db_msgcall_fcn)(const DB_ENV *dbenv, char *msg)); </pre>
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<p>
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There are interfaces in the Berkeley DB library which either directly
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output informational messages or statistical information, or configure
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the library to output such messages when performing other operations,
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for example, <a class="xref" href="envset_verbose.html" title="DB_ENV->set_verbose()">DB_ENV->set_verbose()</a> and
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<a class="xref" href="envstat.html" title="DB_ENV->stat_print()">DB_ENV->stat_print()</a>.
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</p>
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<p>
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The <a class="xref" href="envset_msgcall.html" title="DB_ENV->set_msgcall()">DB_ENV->set_msgcall()</a> and
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<code class="methodname">DB->set_msgcall()</code> methods are used to
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pass these messages to the application, and Berkeley DB will call
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<span class="bold"><strong>db_msgcall_fcn</strong></span> with each message. It
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is up to the <span class="bold"><strong>db_msgcall_fcn</strong></span> function
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to display the message in an appropriate manner.
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</p>
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<p>
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Setting <span class="bold"><strong>db_msgcall_fcn</strong></span> to NULL
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unconfigures the callback interface.
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</p>
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<p>
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Alternatively, you can use the
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<a class="xref" href="dbset_msgfile.html" title="DB->set_msgfile()">DB->set_msgfile()</a> or
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<a class="xref" href="envset_msgfile.html" title="DB_ENV->set_msgfile()">DB->set_msgfile()</a>
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methods to display the messages via a C library FILE *.
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</p>
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<p>
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For <a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handles opened
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inside of Berkeley DB environments, calling the <code class="methodname">DB->set_msgcall()</code>
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method affects the entire environment and is equivalent to calling the
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<code class="methodname">DB_ENV->set_msgcall()</code> method.
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</p>
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<p>
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The <code class="methodname">DB->set_msgcall()</code> method configures operations performed using
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the specified <a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> handle,
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not all operations performed on the underlying database.
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</p>
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<p>
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The <code class="methodname">DB->set_msgcall()</code> method may be called at any time during the
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life of the application.
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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Berkeley DB is not re-entrant. Callback functions should not attempt to make
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library calls (for example, to release locks or close open handles). Re-entering
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Berkeley DB is not guaranteed to work correctly, and the results are undefined.
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2012-11-14 21:35:20 +00:00
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<h3 class="title"><a id="idp58453184"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2012-11-14 21:35:20 +00:00
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<h4 class="title"><a id="idp58453376"></a>db_msgcall_fcn</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>db_msgcall_fcn</strong></span> parameter is the
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application-specified message reporting function. The function takes
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two parameters:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">dbenv</code>
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</p>
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<p>
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The <span class="bold"><strong>dbenv</strong></span> parameter is the enclosing
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database environment.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">msg</code>
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</p>
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<p>
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The <span class="bold"><strong>msg</strong></span> parameter is the message
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string.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2012-11-14 21:35:20 +00:00
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<h3 class="title"><a id="idp58459136"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2012-11-14 21:35:20 +00:00
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<h3 class="title"><a id="idp58454520"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a>
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</p>
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</div>
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<a accesskey="u" href="db.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="dbset_msgfile.html">Next</a></td>
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<td width="40%" align="left" valign="top">DB->set_lorder() </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DB->set_msgfile()</td>
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