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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_data_type, tep_data_pid,tep_data_preempt_count, tep_data_flags -
   Extract common fields from a record.
</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>

enum <strong>trace_flag_type</strong> {
        <em>TRACE_FLAG_IRQS_OFF</em>,
        <em>TRACE_FLAG_IRQS_NOSUPPORT</em>,
        <em>TRACE_FLAG_NEED_RESCHED</em>,
        <em>TRACE_FLAG_HARDIRQ</em>,
        <em>TRACE_FLAG_SOFTIRQ</em>,
};

int <strong>tep_data_type</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_pid</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_preempt_count</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_flags</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>This set of functions can be used to extract common fields from a record.</p></div>
<div class="paragraph"><p>The <strong>tep_data_type()</strong> function gets the event id from the record <em>rec</em>.
It reads the "common_type" field. The <em>tep</em> argument is the trace event parser
context.</p></div>
<div class="paragraph"><p>The <strong>tep_data_pid()</strong> function gets the process id from the record <em>rec</em>.
It reads the "common_pid" field. The <em>tep</em> argument is the trace event parser
context.</p></div>
<div class="paragraph"><p>The <strong>tep_data_preempt_count()</strong> function gets the preemption count from the
record <em>rec</em>. It reads the "common_preempt_count" field. The <em>tep</em> argument is
the trace event parser context.</p></div>
<div class="paragraph"><p>The <strong>tep_data_flags()</strong> function gets the latency flags from the record <em>rec</em>.
It reads the "common_flags" field. The <em>tep</em> argument is the trace event parser
context. Supported latency flags are:</p></div>
<div class="verseblock">
<pre class="content">        <em>TRACE_FLAG_IRQS_OFF</em>,          Interrupts are disabled.
        <em>TRACE_FLAG_IRQS_NOSUPPORT</em>,    Reading IRQ flag is not supported by the architecture.
        <em>TRACE_FLAG_NEED_RESCHED</em>,      Task needs rescheduling.
        <em>TRACE_FLAG_HARDIRQ</em>,           Hard IRQ is running.
        <em>TRACE_FLAG_SOFTIRQ</em>,           Soft IRQ is running.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_data_type()</strong> function returns an integer, representing the event id.</p></div>
<div class="paragraph"><p>The <strong>tep_data_pid()</strong> function returns an integer, representing the process id</p></div>
<div class="paragraph"><p>The <strong>tep_data_preempt_count()</strong> function returns an integer, representing the
preemption count.</p></div>
<div class="paragraph"><p>The <strong>tep_data_flags()</strong> function returns an integer, representing the latency
flags. Look at the <em>trace_flag_type</em> enum for supported flags.</p></div>
<div class="paragraph"><p>All these functions in case of an error return a negative integer.</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="color: #009900">void</span> <span style="font-weight: bold"><span style="color: #000000">process_record</span></span><span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_record</span> <span style="color: #990000">*</span>record<span style="color: #990000">)</span>
<span style="color: #FF0000">{</span>
        <span style="color: #009900">int</span> data<span style="color: #990000">;</span>

        data <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_type</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> record<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>data <span style="color: #990000">>=</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Got the ID of the event */</span></span>
        <span style="color: #FF0000">}</span>

        data <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_pid</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> record<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>data <span style="color: #990000">>=</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Got the process ID */</span></span>
        <span style="color: #FF0000">}</span>

        data <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_preempt_count</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> record<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>data <span style="color: #990000">>=</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Got the preemption count */</span></span>
        <span style="color: #FF0000">}</span>

        data <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_flags</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> record<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>data <span style="color: #990000">>=</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Got the latency flags */</span></span>
        <span style="color: #FF0000">}</span>
<span style="color: #FF0000">}</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>
</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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