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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_alloc, tep_free,tep_ref, tep_unref,tep_get_ref, tep_kbuffer -
   Create, destroy, manage references 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>

struct tep_handle *<strong>tep_alloc</strong>(void);
void <strong>tep_free</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_ref</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_unref</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_ref</strong>(struct tep_handle *<em>tep</em>);
struct kbuffer *<strong>tep_kbuffer</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 are the main functions to create and destroy tep_handle - the main
structure, representing the trace event parser context. This context is used as
the input parameter of most library APIs.</p></div>
<div class="paragraph"><p>The <strong>tep_alloc()</strong> function allocates and initializes the tep context.</p></div>
<div class="paragraph"><p>The <strong>tep_free()</strong> function will decrement the reference of the <em>tep</em> handler.
When there is no more references, then it will free the handler, as well
as clean up all its resources that it had used. The argument <em>tep</em> is
the pointer to the trace event parser context.</p></div>
<div class="paragraph"><p>The <strong>tep_ref()</strong> function adds a reference to the <em>tep</em> handler.</p></div>
<div class="paragraph"><p>The <strong>tep_unref()</strong> function removes a reference from the <em>tep</em> handler. When
the last reference is removed, the <em>tep</em> is destroyed, and all resources that
it had used are cleaned up.</p></div>
<div class="paragraph"><p>The <strong>tep_ref_get()</strong> functions gets the current references of the <em>tep</em> handler.</p></div>
<div class="paragraph"><p>The <strong>tep_kbuffer()</strong> function allocates a kbuffer descriptor that can be used to
parse raw data that is represented by the <em>tep</em> handle descriptor. It must be freed
with <strong>kbuf_free(3)</strong>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>tep_alloc()</strong> returns a pointer to a newly created tep_handle structure.
NULL is returned in case there is not enough free memory to allocate it.</p></div>
<div class="paragraph"><p><strong>tep_ref_get()</strong> returns the current references of <em>tep</em>.
If <em>tep</em> is NULL, 0 is returned.</p></div>
<div class="paragraph"><p><strong>tep_kbuffer()</strong> returns a kbuffer descriptor that can parse the raw data that
represents the tep handle. Must be freed with <strong>kbuf_free(3)</strong>.</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> ref <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_ref</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">tep_ref</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> <span style="color: #990000">(</span>ref<span style="color: #990000">+</span><span style="color: #993399">1</span><span style="color: #990000">)</span> <span style="color: #990000">!=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_ref</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">))</span> <span style="color: #FF0000">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Something wrong happened, the counter is not incremented by 1 */</span></span>
<span style="color: #FF0000">}</span>
<span style="font-weight: bold"><span style="color: #000000">tep_unref</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_free</span></span><span style="color: #990000">(</span>tep<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>
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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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