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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_get_event, tep_get_first_event, tep_get_events_count -
   Access events.
</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>

struct tep_event *<strong>tep_get_event</strong>(struct tep_handle *<em>tep</em>, int <em>index</em>);
struct tep_event *<strong>tep_get_first_event</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_events_count</strong>(struct tep_handle *<em>tep</em>);</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_get_event()</strong> function returns a pointer to event at the given <em>index</em>.
The <em>tep</em> argument is trace event parser context, the <em>index</em> is the index of
the requested event.</p></div>
<div class="paragraph"><p>The <strong>tep_get_first_event()</strong> function returns a pointer to the first event.
As events are stored in an array, this function returns the pointer to the
beginning of the array. The <em>tep</em> argument is trace event parser context.</p></div>
<div class="paragraph"><p>The <strong>tep_get_events_count()</strong> function returns the number of the events
in the array. The <em>tep</em> argument is trace event parser context.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_get_event()</strong> returns a pointer to the event located at <em>index</em>.
NULL is returned in case of error, in case there are no events or <em>index</em> is
out of range.</p></div>
<div class="paragraph"><p>The <strong>tep_get_first_event()</strong> returns a pointer to the first event. NULL is
returned in case of error, or in case there are no events.</p></div>
<div class="paragraph"><p>The <strong>tep_get_events_count()</strong> returns the number of the events. 0 is
returned in case of error, or in case there are no events.</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="color: #009900">int</span> i<span style="color: #990000">,</span>count <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_events_count</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_event</span> <span style="color: #990000">*</span>event<span style="color: #990000">,</span> <span style="color: #990000">*</span>events <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_first_event</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>events <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">/* There are no events */</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-weight: bold"><span style="color: #0000FF">for</span></span> <span style="color: #990000">(</span>i <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span> i <span style="color: #990000">&lt;</span> count<span style="color: #990000">;</span> i<span style="color: #990000">++)</span> <span style="color: #FF0000">{</span>
                event <span style="color: #990000">=</span> <span style="color: #990000">(</span>events<span style="color: #990000">+</span>i<span style="color: #990000">);</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* process events[i] */</span></span>
        <span style="color: #FF0000">}</span>

<span style="font-style: italic"><span style="color: #9A1900">/* Get the last event */</span></span>
        event <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_event</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> count<span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
<span style="color: #FF0000">}</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>
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<h2 id="_see_also">SEE ALSO</h2>
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<div class="paragraph"><p><strong>libtraceevent</strong>(3), <strong>trace-cmd</strong>(1)</p></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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