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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_print_field_content, tep_print_fields, tep_print_num_field, tep_print_func_field, tep_record_print_fields, tep_record_print_selected_fields -
   Print the field content.
</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>
<strong>#include <trace-seq.h></strong>

void <strong>tep_print_field_content</strong>(struct trace_seq *<em>s</em>, void *<em>data</em>, int size, struct tep_format_field *<em>field</em>);
void <strong>tep_print_fields</strong>(struct trace_seq *<em>s</em>, void *<em>data</em>, int <em>size</em>, struct tep_event *<em>event</em>);
int <strong>tep_print_num_field</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int <em>err</em>);
int <strong>tep_print_func_field</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int <em>err</em>);
void <strong>tep_record_print_fields</strong>(struct trace_seq *<em>s</em>, struct tep_record *<em>record</em>, struct tep_event *<em>event</em>);
void <strong>tep_record_print_selected_fields</strong>(struct trace_seq *<em>s</em>, struct tep_record *<em>record</em>, struct tep_event *<em>event</em>, int <em>select_mask</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 print recorded field’s data, according to the field’s type.</p></div>
<div class="paragraph"><p>The <strong>tep_print_field_content()</strong> function extracts from the recorded raw <em>data</em> value of
the <em>field</em> and prints it into <em>s</em>, according to the field type.</p></div>
<div class="paragraph"><p>The <strong>tep_print_fields()</strong> prints each field name followed by the record’s field
value according to the field’s type:</p></div>
<div class="verseblock">
<pre class="content">"field1_name=field1_value field2_name=field2_value …"</pre>
<div class="attribution">
</div></div>
<div class="paragraph"><p>It iterates all fields of the <em>event</em>, and calls <strong>tep_print_field_content()</strong> for each of
them.</p></div>
<div class="paragraph"><p>The <strong>tep_print_num_field()</strong> function prints a numeric field with given format
string. A search is performed in the <em>event</em> for a field with <em>name</em>. If such
field is found, its value is extracted from the <em>record</em> and is printed in the
<em>s</em>, according to the given format string <em>fmt</em>. If the argument <em>err</em> is
non-zero, and an error occures - it is printed in the <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_print_func_field()</strong> function prints a function field with given format
string.  A search is performed in the <em>event</em> for a field with <em>name</em>. If such
field is found, its value is extracted from the <em>record</em>. The value is assumed
to be a function address, and a search is perform to find the name of this
function. The function name (if found) and its address are printed in the <em>s</em>,
according to the given format string <em>fmt</em>. If the argument <em>err</em> is non-zero,
and an error occures - it is printed in <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>tep_record_print_fields()</strong> prints the field’s name followed by its value
for all record’s field.</p></div>
<div class="paragraph"><p>The <strong>tep_record_print_selected_fields()</strong> prints the field’s name followed by
its value for selected subset of record field. The fields to be printed are
defined by the <em>select_mask</em> bit mask.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_print_num_field()</strong> and <strong>tep_print_func_field()</strong> functions return 1
on success, -1 in case of an error or 0 if the print buffer <em>s</em> is full.</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="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000"><trace-seq.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="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">trace_seq</span> seq<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000000">trace_seq_init</span></span><span style="color: #990000">(&</span>seq<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">"timer"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"hrtimer_start"</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="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_format_field</span> <span style="color: #990000">*</span>field_pid <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_find_common_field</span></span><span style="color: #990000">(</span>event<span style="color: #990000">,</span> <span style="color: #FF0000">"common_pid"</span><span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #000000">trace_seq_reset</span></span><span style="color: #990000">(&</span>seq<span style="color: #990000">);</span>

        <span style="font-style: italic"><span style="color: #9A1900">/* Print the value of "common_pid" */</span></span>
        <span style="font-weight: bold"><span style="color: #000000">tep_print_field_content</span></span><span style="color: #990000">(&</span>seq<span style="color: #990000">,</span> record<span style="color: #990000">-></span>data<span style="color: #990000">,</span> record<span style="color: #990000">-></span>size<span style="color: #990000">,</span> field_pid<span style="color: #990000">);</span>

        <span style="font-style: italic"><span style="color: #9A1900">/* Print all fields of the "hrtimer_start" event */</span></span>
        <span style="font-weight: bold"><span style="color: #000000">tep_print_fields</span></span><span style="color: #990000">(&</span>seq<span style="color: #990000">,</span> record<span style="color: #990000">-></span>data<span style="color: #990000">,</span> record<span style="color: #990000">-></span>size<span style="color: #990000">,</span> event<span style="color: #990000">);</span>

        <span style="font-style: italic"><span style="color: #9A1900">/* Print the value of "expires" field with custom format string */</span></span>
        <span style="font-weight: bold"><span style="color: #000000">tep_print_num_field</span></span><span style="color: #990000">(&</span>seq<span style="color: #990000">,</span> <span style="color: #FF0000">" timer expires in %llu "</span><span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"expires"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #993399">0</span><span style="color: #990000">);</span>

        <span style="font-style: italic"><span style="color: #9A1900">/* Print the address and the name of "function" field with custom format string */</span></span>
        <span style="font-weight: bold"><span style="color: #000000">tep_print_func_field</span></span><span style="color: #990000">(&</span>seq<span style="color: #990000">,</span> <span style="color: #FF0000">" timer function is %s "</span><span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"function"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #993399">0</span><span style="color: #990000">);</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>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> <<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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