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<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_filter_alloc, tep_filter_free, tep_filter_reset, tep_filter_make_string, tep_filter_copy, tep_filter_compare, tep_filter_match, tep_event_filtered, tep_filter_remove_event, tep_filter_strerror, tep_filter_add_filter_str -
   Event filter related APIs.
</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_filter *<strong>tep_filter_alloc</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_filter_free</strong>(struct tep_event_filter *<em>filter</em>);
void <strong>tep_filter_reset</strong>(struct tep_event_filter *<em>filter</em>);
enum tep_errno <strong>tep_filter_add_filter_str</strong>(struct tep_event_filter *<em>filter</em>, const char *<em>filter_str</em>);
int <strong>tep_event_filtered</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
int <strong>tep_filter_remove_event</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
enum tep_errno <strong>tep_filter_match</strong>(struct tep_event_filter *<em>filter</em>, struct tep_record *<em>record</em>);
int <strong>tep_filter_copy</strong>(struct tep_event_filter *<em>dest</em>, struct tep_event_filter *<em>source</em>);
int <strong>tep_filter_compare</strong>(struct tep_event_filter *<em>filter1</em>, struct tep_event_filter *<em>filter2</em>);
char *<strong>tep_filter_make_string</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
int <strong>tep_filter_strerror</strong>(struct tep_event_filter *<em>filter</em>, enum tep_errno <em>err</em>, char *buf, size_t <em>buflen</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Filters can be attached to traced events. They can be used to filter out various
events when outputting them. Each event can be filtered based on its parameters,
described in the event&#8217;s format file. This set of functions can be used to
create, delete, modify and attach event filters.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_alloc()</strong> function creates a new event filter. The <em>tep</em> argument
is the trace event parser context.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_free()</strong> function frees an event filter and all resources that it
had used.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_reset()</strong> function removes all rules from an event filter and
resets it.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_add_filter_str()</strong> function adds a new rule to the <em>filter</em>. The
<em>filter_str</em> argument is the filter string, that contains the rule.</p></div>
<div class="paragraph"><p>The <strong>tep_event_filtered()</strong> function checks if the event with <em>event_id</em> has
<em>filter</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_remove_event()</strong> function removes a <em>filter</em> for an event with
<em>event_id</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_match()</strong> function tests if a <em>record</em> matches given <em>filter</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_copy()</strong> function copies a <em>source</em> filter into a <em>dest</em> filter.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_compare()</strong> function compares two filers - <em>filter1</em> and <em>filter2</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_make_string()</strong> function constructs a string, displaying
the <em>filter</em> contents for given <em>event_id</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_strerror()</strong> function copies the <em>filter</em> error buffer into the
given <em>buf</em> with the size <em>buflen</em>. If the error buffer is empty, in the <em>buf</em>
is copied a string, describing the error <em>err</em>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_filter_alloc()</strong> function returns a pointer to the newly created event
filter, or NULL in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_add_filter_str()</strong> function returns 0 if the rule was
successfully added or a negative error code.  Use <strong>tep_filter_strerror()</strong> to see
actual error message in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_event_filtered()</strong> function returns 1 if the filter is found for given
event, or 0 otherwise.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_remove_event()</strong> function returns 1 if the vent was removed, or
0 if the event was not found.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_match()</strong> function returns <em>tep_errno</em>, according to the result:</p></div>
<div class="verseblock">
<pre class="content"><em>TEP_ERRNO__FILTER_MATCH</em>        - filter found for event, the record matches.
<em>TEP_ERRNO__FILTER_MISS</em>         - filter found for event, the record does not match.
<em>TEP_ERRNO__FILTER_NOT_FOUND</em>    - no filter found for record&#8217;s event.
<em>TEP_ERRNO__NO_FILTER</em>           - no rules in the filter.</pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>or any other <em>tep_errno</em>, if an error occurred during the test.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_copy()</strong> function returns 0 on success or -1 if not all rules
 were copied.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_compare()</strong> function returns 1 if the two filters hold the same
content, or 0 if they do not.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_make_string()</strong> function returns a string, which must be freed
with free(), or NULL in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_filter_strerror()</strong> function returns 0 if message was filled
successfully, or -1 in case of an error.</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">char</span> errstr<span style="color: #990000">[</span><span style="color: #993399">200</span><span style="color: #990000">];</span>
<span style="color: #009900">int</span> ret<span style="color: #990000">;</span>

<span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_event_filter</span> <span style="color: #990000">*</span>filter <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_filter_alloc</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_filter</span> <span style="color: #990000">*</span>filter1 <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_filter_alloc</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">);</span>
ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_filter_add_filter_str</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> <span style="color: #FF0000">"sched/sched_wakeup:target_cpu==1"</span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">(</span>ret <span style="color: #990000">&lt;</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
        <span style="font-weight: bold"><span style="color: #000000">tep_filter_strerror</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> ret<span style="color: #990000">,</span> errstr<span style="color: #990000">,</span> <span style="font-weight: bold"><span style="color: #0000FF">sizeof</span></span><span style="color: #990000">(</span>errstr<span style="color: #990000">));</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Failed to add a new rule to the filter, the error string is in errstr */</span></span>
<span style="color: #FF0000">}</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_filter_copy</span></span><span style="color: #990000">(</span>filter1<span style="color: #990000">,</span> filter<span style="color: #990000">)</span> <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">/* Failed to copy filter in filter1 */</span></span>
<span style="color: #FF0000">}</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_filter_compare</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> filter1<span style="color: #990000">)</span> <span style="color: #990000">!=</span> <span style="color: #993399">1</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Both filters are different */</span></span>
<span style="color: #FF0000">}</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_handle</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_record</span> <span style="color: #990000">*</span>record<span style="color: #990000">)</span>
<span style="color: #FF0000">{</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: #009900">char</span> <span style="color: #990000">*</span>fstring<span style="color: #990000">;</span>

event <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_find_event_by_record</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><span style="font-weight: bold"><span style="color: #000000">tep_event_filtered</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> event<span style="color: #990000">-&gt;</span>id<span style="color: #990000">)</span> <span style="color: #990000">==</span> <span style="color: #993399">1</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* The event has filter */</span></span>
                fstring <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_filter_make_string</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> event<span style="color: #990000">-&gt;</span>id<span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>fstring <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">/* The filter for the event is in fstring */</span></span>
                        <span style="font-weight: bold"><span style="color: #000000">free</span></span><span style="color: #990000">(</span>fstring<span style="color: #990000">);</span>
                <span style="color: #FF0000">}</span>
        <span style="color: #FF0000">}</span>

<span style="font-weight: bold"><span style="color: #0000FF">switch</span></span> <span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #000000">tep_filter_match</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">,</span> record<span style="color: #990000">))</span> <span style="color: #FF0000">{</span>
        <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> TEP_ERRNO__FILTER_MATCH<span style="color: #990000">:</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* The filter matches the record */</span></span>
                <span style="font-weight: bold"><span style="color: #0000FF">break</span></span><span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> TEP_ERRNO__FILTER_MISS<span style="color: #990000">:</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* The filter does not match the record */</span></span>
                <span style="font-weight: bold"><span style="color: #0000FF">break</span></span><span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> TEP_ERRNO__FILTER_NOT_FOUND<span style="color: #990000">:</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* No filter found for record's event */</span></span>
                <span style="font-weight: bold"><span style="color: #0000FF">break</span></span><span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> TEP_ERRNO__NO_FILTER<span style="color: #990000">:</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* There are no rules in the filter */</span></span>
                <span style="font-weight: bold"><span style="color: #0000FF">break</span></span>
<span style="font-weight: bold"><span style="color: #008080">        default:</span></span>
                <span style="font-style: italic"><span style="color: #9A1900">/* An error occurred during the test */</span></span>
                <span style="font-weight: bold"><span style="color: #0000FF">break</span></span><span style="color: #990000">;</span>
        <span style="color: #FF0000">}</span>

<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_filter_reset</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #000000">tep_filter_free</span></span><span style="color: #990000">(</span>filter<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">tep_filter_free</span></span><span style="color: #990000">(</span>filter1<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>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="verseblock">
<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>
<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  &lt;<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>&gt;</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>
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Last updated
 2024-10-11 21:26:45 UTC
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