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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_register_event_handler, tep_unregister_event_handler -
   Register / unregisters a callback function to parse an event information.
</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>

enum <strong>tep_reg_handler</strong> {
        <em>TEP_REGISTER_SUCCESS</em>,
        <em>TEP_REGISTER_SUCCESS_OVERWRITE</em>,
};

int <strong>tep_register_event_handler</strong>(struct tep_handle *<em>tep</em>, int <em>id</em>, const char *<em>sys_name</em>, const char *<em>event_name</em>, tep_event_handler_func <em>func</em>, void *<em>context</em>);
int <strong>tep_unregister_event_handler</strong>(struct tep_handle *tep, int id, const char *sys_name, const char *event_name, tep_event_handler_func func, void *<em>context</em>);

typedef int (<strong>*tep_event_handler_func</strong>)(struct trace_seq *s, struct tep_record *record, struct tep_event *event, void *context);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_register_event_handler()</strong> function registers a handler function,
which is going to be called to parse the information for a given event.
The <em>tep</em> argument is the trace event parser context. The <em>id</em> argument is
the id of the event. The <em>sys_name</em> argument is the name of the system,
the event belongs to. The <em>event_name</em> argument is the name of the event.
If <em>id</em> is >= 0, it is used to find the event, otherwise <em>sys_name</em> and
<em>event_name</em> are used. The <em>func</em> is a pointer to the function, which is going
to be called to parse the event information. The <em>context</em> argument is a pointer
to the context data, which will be passed to the <em>func</em>. If a handler function
for the same event is already registered, it will be overridden with the new
one. This mechanism allows a developer to override the parsing of a given event.
If for some reason the default print format is not sufficient, the developer
can register a function for an event to be used to parse the data instead.</p></div>
<div class="paragraph"><p>The <strong>tep_unregister_event_handler()</strong> function unregisters the handler function,
previously registered with <strong>tep_register_event_handler()</strong>. The <em>tep</em> argument
is the trace event parser context. The <em>id</em>, <em>sys_name</em>, <em>event_name</em>, <em>func</em>,
and <em>context</em> are the same arguments, as when the callback function <em>func</em> was
registered.</p></div>
<div class="paragraph"><p>The <em>tep_event_handler_func</em> is the type of the custom event handler
function. The <em>s</em> argument is the trace sequence, it can be used to create a
custom string, describing the event. A <em>record</em>  to get the event from is passed
as input parameter and also the <em>event</em> - the handle to the record’s event. The
<em>context</em> is custom context, set when the custom event handler is registered.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_register_event_handler()</strong> function returns <em>TEP_REGISTER_SUCCESS</em>
if the new handler is registered successfully or
<em>TEP_REGISTER_SUCCESS_OVERWRITE</em> if an existing handler is overwritten.
If there is not  enough memory to complete the registration,
TEP_ERRNO__MEM_ALLOC_FAILED is returned.</p></div>
<div class="paragraph"><p>The <strong>tep_unregister_event_handler()</strong> function returns 0 if <em>func</em> was removed
successful or, -1 if the event was not found.</p></div>
<div class="paragraph"><p>The <em>tep_event_handler_func</em> should return -1 in case of an error,
or 0 otherwise.</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="color: #009900">int</span> <span style="font-weight: bold"><span style="color: #000000">timer_expire_handler</span></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> <span style="color: #990000">*</span>s<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="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">void</span> <span style="color: #990000">*</span>context<span style="color: #990000">)</span>
<span style="color: #FF0000">{</span>
        <span style="font-weight: bold"><span style="color: #000000">trace_seq_printf</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">"hrtimer="</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_print_num_field</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">"0x%llx"</span><span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"timer"</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: #990000">==</span> <span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">)</span>
                <span style="font-weight: bold"><span style="color: #000000">tep_print_num_field</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">"0x%llx"</span><span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"hrtimer"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #993399">1</span><span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #000000">trace_seq_printf</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">" now="</span><span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #000000">tep_print_num_field</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">"%llu"</span><span style="color: #990000">,</span> event<span style="color: #990000">,</span> <span style="color: #FF0000">"now"</span><span style="color: #990000">,</span> record<span style="color: #990000">,</span> <span style="color: #993399">1</span><span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #000000">tep_print_func_field</span></span><span style="color: #990000">(</span>s<span style="color: #990000">,</span> <span style="color: #FF0000">" function=%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="font-weight: bold"><span style="color: #0000FF">return</span></span> <span style="color: #993399">0</span><span style="color: #990000">;</span>
<span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
        <span style="color: #009900">int</span> ret<span style="color: #990000">;</span>

        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_register_event_handler</span></span><span style="color: #990000">(</span>tep<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">"timer"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"hrtimer_expire_entry"</span><span style="color: #990000">,</span>
                                         timer_expire_handler<span style="color: #990000">,</span> NULL<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"><</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="color: #009900">char</span> buf<span style="color: #990000">[</span><span style="color: #993399">32</span><span style="color: #990000">];</span>

                <span style="font-weight: bold"><span style="color: #000000">tep_strerror</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> ret<span style="color: #990000">,</span> buf<span style="color: #990000">,</span> <span style="color: #993399">32</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">"Failed to register handler for hrtimer_expire_entry: %s</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> buf<span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span> <span style="font-weight: bold"><span style="color: #0000FF">else</span></span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #0000FF">switch</span></span> <span style="color: #990000">(</span>ret<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> TEP_REGISTER_SUCCESS<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">"Registered handler for hrtimer_expire_entry</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">);</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_REGISTER_SUCCESS_OVERWRITE<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">"Overwrote handler for hrtimer_expire_entry</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">);</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: #FF0000">}</span>
<span style="color: #990000">...</span>
        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_unregister_event_handler</span></span><span style="color: #990000">(</span>tep<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">"timer"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"hrtimer_expire_entry"</span><span style="color: #990000">,</span>
                                           timer_expire_handler<span style="color: #990000">,</span> NULL<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">)</span>
                <span style="font-weight: bold"><span style="color: #000000">printf</span></span> <span style="color: #990000">(</span><span style="color: #FF0000">"Failed to unregister handler for hrtimer_expire_entry</span><span style="color: #CC33CC">\n</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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