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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_load_plugins, tep_unload_plugins, tep_load_plugins_hook, tep_add_plugin_path -
Load / unload traceevent plugins.
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>#include <event-parse.h></strong>
struct tep_plugin_list *<strong>tep_load_plugins</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_unload_plugins</strong>(struct tep_plugin_list *<em>plugin_list</em>, struct tep_handle *<em>tep</em>);
void <strong>tep_load_plugins_hook</strong>(struct tep_handle *<em>tep</em>, const char *<em>suffix</em>,
void (*<em>load_plugin</em>)(struct tep_handle *tep,
const char *path,
const char *name,
void *data),
void *<em>data</em>);
int <strong>tep_add_plugin_path</strong>(struct tep_handle *tep, char *path,
enum tep_plugin_load_priority prio);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_load_plugins()</strong> function loads all plugins, located in the plugin
directories. The <em>tep</em> argument is trace event parser context.
The plugin directories are :</p></div>
<div class="verseblock">
<pre class="content"> - Directories, specified in <em>tep</em>→plugins_dir with priority TEP_PLUGIN_FIRST
- System’s plugin directory, defined at the library compile time. It
depends on the library installation prefix and usually is
<em>(install_preffix)/lib/traceevent/plugins</em>
- Directory, defined by the environment variable <em>TRACEEVENT_PLUGIN_DIR</em>
- User’s plugin directory, located at <em>~/.local/lib/traceevent/plugins</em>
- Directories, specified in <em>tep</em>→plugins_dir with priority TEP_PLUGIN_LAST</pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>Loading of plugins can be controlled by the <em>tep_flags</em>, using the
<strong>tep_set_flag()</strong> API:</p></div>
<div class="verseblock">
<pre class="content"> <em>TEP_DISABLE_SYS_PLUGINS</em> - do not load plugins, located in
the system’s plugin directory.
<em>TEP_DISABLE_PLUGINS</em> - do not load any plugins.</pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>The <strong>tep_set_flag()</strong> API needs to be called before <strong>tep_load_plugins()</strong>, if
loading of all plugins is not the desired case.</p></div>
<div class="paragraph"><p>The <strong>tep_unload_plugins()</strong> function unloads the plugins, previously loaded by
<strong>tep_load_plugins()</strong>. The <em>tep</em> argument is trace event parser context. The
<em>plugin_list</em> is the list of loaded plugins, returned by
the <strong>tep_load_plugins()</strong> function.</p></div>
<div class="paragraph"><p>The <strong>tep_load_plugins_hook()</strong> function walks through all directories with plugins
and calls user specified <strong>load_plugin()</strong> hook for each plugin file. Only files
with given <em>suffix</em> are considered to be plugins. The <em>data</em> is a user specified
context, passed to <strong>load_plugin()</strong>. Directories and the walk order are the same
as in <strong>tep_load_plugins()</strong> API.</p></div>
<div class="paragraph"><p>The <strong>tep_add_plugin_path()</strong> functions adds additional directories with plugins in
the <em>tep</em>→plugins_dir list. It must be called before <strong>tep_load_plugins()</strong> in order
for the plugins from the new directories to be loaded. The <em>tep</em> argument is
the trace event parser context. The <em>path</em> is the full path to the new plugin
directory. The <em>prio</em> argument specifies the loading priority order for the
new directory of plugins. The loading priority is important in case of different
versions of the same plugin located in multiple plugin directories.The last loaded
plugin wins. The priority can be:</p></div>
<div class="verseblock">
<pre class="content"> <em>TEP_PLUGIN_FIRST</em> - Load plugins from this directory first
<em>TEP_PLUGIN_LAST</em> - Load plugins from this directory last</pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>Where the plugins in TEP_PLUGIN_LAST" will take precedence over the
plugins in the other directories.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_load_plugins()</strong> function returns a list of successfully loaded plugins,
or NULL in case no plugins are loaded.
The <strong>tep_add_plugin_path()</strong> function returns -1 in case of an error, 0 otherwise.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000"><event-parse.h></span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_handle</span> <span style="color: #990000">*</span>tep <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_alloc</span></span><span style="color: #990000">();</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_add_plugin_path</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"~/dev_plugins"</span><span style="color: #990000">,</span> TEP_PLUGIN_LAST<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_plugin_list</span> <span style="color: #990000">*</span>plugins <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_load_plugins</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>plugins <span style="color: #990000">==</span> NULL<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
<span style="font-style: italic"><span style="color: #9A1900">/* no plugins are loaded */</span></span>
<span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_unload_plugins</span></span><span style="color: #990000">(</span>plugins<span style="color: #990000">,</span> tep<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="color: #009900">void</span> <span style="font-weight: bold"><span style="color: #000000">print_plugin</span></span><span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_handle</span> <span style="color: #990000">*</span>tep<span style="color: #990000">,</span> <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #009900">char</span> <span style="color: #990000">*</span>path<span style="color: #990000">,</span>
<span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #009900">char</span> <span style="color: #990000">*</span>name<span style="color: #990000">,</span> <span style="color: #009900">void</span> <span style="color: #990000">*</span>data<span style="color: #990000">)</span>
<span style="color: #FF0000">{</span>
<span style="font-weight: bold"><span style="color: #000000">pritnf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Found libtraceevent plugin %s/%s</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> path<span style="color: #990000">,</span> name<span style="color: #990000">);</span>
<span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_load_plugins_hook</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">".so"</span><span style="color: #990000">,</span> print_plugin<span style="color: #990000">,</span> NULL<span style="color: #990000">);</span>
<span style="color: #990000">...</span></tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_files">FILES</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>event-parse.h</strong>
Header file to include in order to have access to the library APIs.
<strong>-ltraceevent</strong>
Linker switch to add when building a program that uses the library.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>libtraceevent</strong>(3), <strong>trace-cmd</strong>(1), <strong>tep_set_flag</strong>(3)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>Steven Rostedt</strong> <<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>>, author of <strong>libtraceevent</strong>.
<strong>Tzvetomir Stoyanov</strong> <<a href="mailto:tz.stoyanov@gmail.com">tz.stoyanov@gmail.com</a>>, author of this man page.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_reporting_bugs">REPORTING BUGS</h2>
<div class="sectionbody">
<div class="paragraph"><p>Report bugs to <<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_license">LICENSE</h2>
<div class="sectionbody">
<div class="paragraph"><p>libtraceevent is Free Software licensed under the GNU LGPL 2.1</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">RESOURCES</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/">https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/</a></p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
2022-03-24 23:40:51 UTC
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