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<title>log4c: Log4c : Logging for C Library</title>
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<div id="projectname">log4c <span id="projectnumber">1.2.1</span></div>
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<div class="title">Log4c : Logging for C Library </div> </div>
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<a href="#summary">Summary</a>
<a href="#requirements">Requirements</a>
<a href="#installation">Installation</a>
<a href="#config">Configuration</a>
<a href="#custom">Customization</a>
<a href="#thanks">Thanks</a>
<a href="#copyright">Copyright</a>
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<h2><a class="anchor" id="summary"></a>
Summary</h2>
<p>Log4c is a library of C for flexible logging to files, syslog and other destinations. It is modeled after the Log for Java library (<a href="http://jakarta.apache.org/log4j/">http://jakarta.apache.org/log4j/</a>), staying as close to their API as is reasonable. Here is a <a href="http://jakarta.apache.org/log4j/docs/manual.html">short introduction</a> to Log4j which describes the API, and design rationale.</p>
<p>Mark Mendel started a parallel log4c projet with a different philosophy. The design is macro oriented, so much lighter and faster which perfect for kernel development.</p>
<p>Log4c is also available from SourceForge (<a href="http://www.sourceforge.net/projects/log4c/">http://www.sourceforge.net/projects/log4c/</a>). This is work in progress.</p>
<h2><a class="anchor" id="requirements"></a>
Requirements</h2>
<h3><a class="anchor" id="platforms"></a>
Platforms</h3>
<p>log4c was successfully compiled and run on the following platforms :</p>
<ul>
<li>HP-UX release 11.00 </li>
<li>Tru 64 release 4.0F and 5.1 </li>
<li>Red Hat Linux Intel release 7.x, 8, 9 </li>
<li>Red Hat Enterprise Linux 3, 4 </li>
<li>Solaris Intel release 8, 9, 10 </li>
<li>FreeBSD 6.1-RELEASE </li>
<li>AIX 5.3 (witk xlc compiler) </li>
<li>Mac OS X </li>
<li>Windows X</li>
</ul>
<p>log4c should compile and run on the following platforms :</p>
<ul>
<li>The BSD family </li>
<li>Other Linux distributions</li>
</ul>
<h3><a class="anchor" id="software"></a>
Software</h3>
<p>The following softwares are needed to generate log4c:</p>
<ul>
<li><a href="http://gcc.gnu.org">GCC</a> 3.0.1+, to generate log4c, but hopefully not to use it. </li>
<li><a href="http://www.stack.nl/~dimitri/doxygen/index.html">doxygen</a> 1.2.13+, a documentation system for C/C++ needed to generate the documentation. </li>
<li><a href="http://www.graphviz.org/">graphviz</a>, the AT&T Graph Visualization Tools also needed to generate the documentation.</li>
</ul>
<p>For the moment, log4c uses specific GCC extensions, like <code>__attribute__</code>, so you will need GCC to compile it. This will probably change one day.</p>
<h2><a class="anchor" id="installation"></a>
Installation</h2>
<h3><a class="anchor" id="installation_tarballs"></a>
Building from source tarballs</h3>
<p>on SourceForge: </p>
<ul>
<li><a href="http://prdownloads.sourceforge.net/log4c/log4c-1.2.1.tar.gz">log4c-1.2.1.tar.gz</a></li>
</ul>
<p>The log4c package uses the GNU autotools compilation and installation framework. The following commands should build log4c on the supported platforms:</p>
<div class="fragment"><pre class="fragment">$ gzip -dc log4c-1.2.1.tar.gz | tar tvf -
$ cd log4c-1.2.1/
$ ./configure --prefix=/path/of/installation
$ make
$ make install
</pre></div><p>Checkout the <code>INSTALL</code> file for installation and the generated doxygen documentation for more information.</p>
<h3><a class="anchor" id="installation_rpm"></a>
Using RPMs</h3>
<p>FC7 RPMs on SourceForge: </p>
<ul>
<li><a href="http://prdownloads.sourceforge.net/log4c/log4c-1.2.1-1.i386.rpm">log4c-1.2.1-1.i386.rpm</a> </li>
<li><a href="http://prdownloads.sourceforge.net/log4c/log4c-devel-1.2.1-1.i386.rpm">log4c-devel-1.2.1-1.i386.rpm</a> </li>
<li><a href="http://prdownloads.sourceforge.net/log4c/log4c-doc-1.2.1-1.i386.rpm">log4c-doc-1.2.1-1.i386.rpm</a></li>
</ul>
<p>The following command install the log4c RPMs :</p>
<div class="fragment"><pre class="fragment">$ sudo rpm -Uvh log4c-1.2.1.i386.rpm log4c-devel-1.2.1.i386.rpm
</pre></div><h2><a class="anchor" id="config"></a>
Configuration</h2>
<h3><a class="anchor" id="conf_files"></a>
Configuration files</h3>
<p>log4c searches the folloging files to load its configuration:</p>
<ul>
<li><code>${LOG4C_RCPATH}/log4crc</code> </li>
<li><code>${HOME}/</code>.log4crc </li>
<li><code></code>./log4crc</li>
</ul>
<p>The environment variable <code>LOG4C_RCPATH</code> holds the prefix used for installation.</p>
<h3><a class="anchor" id="conf_syntax"></a>
Configuration syntax</h3>
<p>The <code>log4crc</code> configuration file uses an XML syntax. The root element is <code></code> <log4c> and it can be used to control the configuration file version interface with the attribute <code>"version"</code>. The following 4 elements are supported: <code></code> <config>, <code></code> <category>, <code></code> <appender> and <code></code> <layout>.</p>
<ul>
<li>The <code></code> <config> element controls the global log4c configuration. It has 3 sub elements. The <code></code> <nocleanup> flag inhibits the log4c destructors routines. The <code></code> <bufsize> element sets the buffer size used to format <a class="el" href="structlog4c__logging__event__t.html" title="logging event object">log4c_logging_event_t</a> objects. If is set to 0, the allocation is dynamic (the <code></code> <debug> element is currently unused).</li>
</ul>
<ul>
<li>The <code></code> <category> element has 3 possible attributes: the category <code>"name"</code>, the category <code>"priority"</code> and the category <code>"appender"</code>. Future versions will handle multple appenders per category.</li>
</ul>
<ul>
<li>The <code></code> <appender> element has 3 possible attributes: the appender <code>"name"</code>, the appender <code>"type"</code>, and the appender <code>"layout"</code>.</li>
</ul>
<ul>
<li>The <code></code> <layout> element has 2 possible attributes: the layout <code>"name"</code> and the layout <code>"type"</code>.</li>
</ul>
<p>Here's the default <code>log4crc</code> configuration <a href="file:">file:</a></p>
<div class="fragment"><pre class="fragment"></pre></div><p>This initial version of the log4c configuration file syntax is quite different from log4j. XML seemed the best choice to keep the log4j configuration power in a C API.</p>
<h3><a class="anchor" id="env"></a>
Environment variables</h3>
<ul>
<li><code>LOG4C_RCPATH</code> holds the path to the main <code>log4crc</code> configuration file </li>
<li><code>LOG4C_PRIORITY</code> holds the <code>"root"</code> category priority </li>
<li><code>LOG4C_APPENDER</code> holds the <code>"root"</code> category appender</li>
</ul>
<h2><a class="anchor" id="custom"></a>
Customization</h2>
<p>This section will, one day, briefly describe how to define custom appenders and custom layouts. Be patient or checkout the source.</p>
<h2><a class="anchor" id="thanks"></a>
Thanks</h2>
<p>Mark Mendel for his work on a previous version of log4c.</p>
<p>This project would not have existed without Ceki Gulcu, the creator and maintainer of <a href="http://jakarta.apache.org/log4j">Log4j</a>, nor without Bastiaan Bakker, who intiated me with <a href="http://log4cpp.sourceforge.net/">Log4Cpp</a>.</p>
<p>Many thanks to</p>
<ul>
<li>Joel Schaubert for many contributions </li>
<li>Robert Byrne for Windows port and also many contributions </li>
<li>Olger Warnier for the Mac OS X port </li>
<li>Jeff Smith for writing a primer on <a href="http://jefficus.usask.ca/article.php?story=20040613140849924">how to use Log4c effectively</a></li>
</ul>
<h2><a class="anchor" id="copyright"></a>
Copyright</h2>
<p>All software in this package is Copyright (C) 2003-2004 Meiosys <a href="http://www.meiosys.com">http://www.meiosys.com</a> and Cedric Le Goater and is distributed under the <a href="http://www.gnu.org/licenses/lgpl.html">LGPL</a> License. See the <code>COPYING</code> file for full legal details. </p>
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