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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_header_page_size, tep_get_header_timestamp_size, tep_is_old_format -
   Get the data stored in the header page, in kernel 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>

int <strong>tep_get_header_page_size</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_header_timestamp_size</strong>(struct tep_handle *<em>tep</em>);
bool <strong>tep_is_old_format</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>These functions retrieve information from kernel context, stored in tracefs
events/header_page. Old kernels do not have header page info, so default values
from user space context are used.</p></div>
<div class="paragraph"><p>The <strong>tep_get_header_page_size()</strong> function returns the size of a long integer,
in kernel context. The <em>tep</em> argument is trace event parser context.
This information is retrieved from tracefs events/header_page, "commit" field.</p></div>
<div class="paragraph"><p>The <strong>tep_get_header_timestamp_size()</strong> function returns the size of timestamps,
in kernel context. The <em>tep</em> argument is trace event parser context. This
information is retrieved from tracefs events/header_page, "timestamp" field.</p></div>
<div class="paragraph"><p>The <strong>tep_is_old_format()</strong> function returns true if the kernel predates
the addition of events/header_page, otherwise it returns false.</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_header_page_size()</strong> function returns the size of a long integer,
in bytes.</p></div>
<div class="paragraph"><p>The <strong>tep_get_header_timestamp_size()</strong> function returns the size of timestamps,
in bytes.</p></div>
<div class="paragraph"><p>The <strong>tep_is_old_format()</strong> function returns true, if an old kernel is used to
generate the tracing data, which has no event/header_page. If the kernel is new,
or <em>tep</em> is NULL, false is returned.</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> longsize<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> timesize<span style="color: #990000">;</span>
        <span style="color: #009900">bool</span> old<span style="color: #990000">;</span>

longsize <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_header_page_size</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
        timesize <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_header_timestamp_size</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
        old <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_is_old_format</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>

<span style="font-weight: bold"><span style="color: #000000">printf</span></span> <span style="color: #990000">(</span><span style="color: #FF0000">"%s kernel is used to generate the tracing data.</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span>
                old<span style="color: #990000">?</span><span style="color: #FF0000">"Old"</span><span style="color: #990000">:</span><span style="color: #FF0000">"New"</span><span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #000000">printf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"The size of a long integer is %d bytes.</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> longsize<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #000000">printf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"The timestamps size is %d bytes.</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> timesize<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>
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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
 2022-03-24 23:40:51 UTC
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