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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_any_field_val, tep_get_common_field_val, tep_get_field_val, tep_get_field_raw -
   Get value of a field.
</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>
<strong>#include &lt;trace-seq.h&gt;</strong>

int <strong>tep_get_any_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
int <strong>tep_get_common_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
int <strong>tep_get_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
void *<strong>tep_get_field_raw</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int *<em>len</em>, int <em>err</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 can be used to find a field and retrieve its value.</p></div>
<div class="paragraph"><p>The <strong>tep_get_any_field_val()</strong> function searches in the <em>record</em> for a field
with <em>name</em>, part of the <em>event</em>. If the field is found, its value is stored in
<em>val</em>. If there is an error and <em>err</em> is not zero, then an error string is
written into <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_get_common_field_val()</strong> function does the same as
<strong>tep_get_any_field_val()</strong>, but searches only in the common fields. This works
for any event as all events include the common fields.</p></div>
<div class="paragraph"><p>The <strong>tep_get_field_val()</strong> function does the same as <strong>tep_get_any_field_val()</strong>,
but searches only in the event specific fields.</p></div>
<div class="paragraph"><p>The <strong>tep_get_field_raw()</strong> function searches in the <em>record</em> for a field with
<em>name</em>, part of the <em>event</em>. If the field is found, a pointer to where the field
exists in the record&#8217;s raw data is returned. The size of the data is stored in
<em>len</em>. If there is an error and <em>err</em> is not zero, then an error string is
written into <em>s</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_get_any_field_val()</strong>, <strong>tep_get_common_field_val()</strong> and
<strong>tep_get_field_val()</strong> functions return 0 on success, or -1 in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_get_field_raw()</strong> function returns a pointer to field&#8217;s raw data, and
places the length of this data in <em>len</em>. In case of an error NULL 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="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;trace-seq.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="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="font-weight: bold"><span style="color: #000000">tep_find_event_by_name</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"kvm"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"kvm_exit"</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> len<span style="color: #990000">;</span>
        <span style="color: #009900">char</span> <span style="color: #990000">*</span>comm<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: #009900">unsigned</span> <span style="color: #009900">long</span> <span style="color: #009900">long</span> val<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>event <span style="color: #990000">!=</span> NULL<span style="color: #990000">)</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_get_common_field_val</span></span><span style="color: #990000">(</span>NULL<span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"common_type"</span><span style="color: #990000">,</span>
                                             record<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>val<span style="color: #990000">,</span> <span style="color: #993399">0</span><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">/* Got the value of common type field */</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_get_field_val</span></span><span style="color: #990000">(</span>NULL<span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"pid"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>val<span style="color: #990000">,</span> <span style="color: #993399">0</span><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">/* Got the value of pid specific field */</span></span>
                <span style="color: #FF0000">}</span>
                comm <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_field_raw</span></span><span style="color: #990000">(</span>NULL<span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"comm"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>len<span style="color: #990000">,</span> <span style="color: #993399">0</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>comm <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">/* Got a pointer to the comm event specific field */</span></span>
                <span style="color: #FF0000">}</span>
        <span style="color: #FF0000">}</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>trace-seq.h</strong>
        Header file to include in order to have access to trace sequences
        related APIs. Trace sequences are used to allow a function to call
        several other functions to create a string of data to use.
<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>
<div id="footer">
<div id="footer-text">
Last updated
 2024-10-11 21:26:45 UTC
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