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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_set_flag, tep_clear_flag, tep_test_flag -
   Manage flags of trace event parser context.
</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 &lt;event-parse.h&gt;</strong>

enum <strong>tep_flag</strong> {
        <em>TEP_NSEC_OUTPUT</em>,
        <em>TEP_DISABLE_SYS_PLUGINS</em>,
        <em>TEP_DISABLE_PLUGINS</em>
};
void <strong>tep_set_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flag</em>);
void <strong>tep_clear_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flag</em>);
bool <strong>tep_test_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flag</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Trace event parser context flags are defined in <strong>enum tep_flag</strong>:</p></div>
<div class="verseblock">
<pre class="content"><em>TEP_NSEC_OUTPUT</em> - print event&#8217;s timestamp in nano seconds, instead of micro seconds.
<em>TEP_DISABLE_SYS_PLUGINS</em> - disable plugins, located in system&#8217;s plugin
                        directory. This directory is defined at library compile
                        time, and usually depends on library installation
                        prefix: (install_preffix)/lib/traceevent/plugins
<em>TEP_DISABLE_PLUGINS</em> - disable all library plugins:
                        - in system&#8217;s plugin directory
                        - in directory, defined by the environment variable <em>TRACEEVENT_PLUGIN_DIR</em>
                        - in user&#8217;s home directory, <em>~/.traceevent/plugins</em></pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>Note: plugin related flags must me set before calling <strong>tep_load_plugins()</strong> API.</p></div>
<div class="paragraph"><p>The <strong>tep_set_flag()</strong> function sets <em>flag</em> to <em>tep</em> context.</p></div>
<div class="paragraph"><p>The <strong>tep_clear_flag()</strong> function clears <em>flag</em> from <em>tep</em> context.</p></div>
<div class="paragraph"><p>The <strong>tep_test_flag()</strong> function tests if <em>flag</em> is set to <em>tep</em> context.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>tep_test_flag()</strong> function returns true if <em>flag</em> is set, false otherwise.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><tt><span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;event-parse.h&gt;</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-style: italic"><span style="color: #9A1900">/* Print timestamps in nanoseconds */</span></span>
<span style="font-weight: bold"><span style="color: #000000">tep_set_flag</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span>  TEP_NSEC_OUTPUT<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #000000">tep_test_flag</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> TEP_NSEC_OUTPUT<span style="color: #990000">))</span> <span style="color: #FF0000">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* print timestamps in nanoseconds */</span></span>
<span style="color: #FF0000">}</span> <span style="font-weight: bold"><span style="color: #0000FF">else</span></span> <span style="color: #FF0000">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* print timestamps in microseconds */</span></span>
<span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
<span style="font-style: italic"><span style="color: #9A1900">/* Print timestamps in microseconds */</span></span>
<span style="font-weight: bold"><span style="color: #000000">tep_clear_flag</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> TEP_NSEC_OUTPUT<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)</p></div>
</div>
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<h2 id="_author">AUTHOR</h2>
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<pre class="content"><strong>Steven Rostedt</strong> &lt;<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>&gt;, author of <strong>libtraceevent</strong>.
<strong>Tzvetomir Stoyanov</strong> &lt;<a href="mailto:tz.stoyanov@gmail.com">tz.stoyanov@gmail.com</a>&gt;, author of this man page.</pre>
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<h2 id="_reporting_bugs">REPORTING BUGS</h2>
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<div class="paragraph"><p>Report bugs to  &lt;<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>&gt;</p></div>
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<h2 id="_license">LICENSE</h2>
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<div class="paragraph"><p>libtraceevent is Free Software licensed under the GNU LGPL 2.1</p></div>
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<h2 id="_resources">RESOURCES</h2>
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<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>
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Last updated
 2024-10-11 21:26:45 UTC
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