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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_comm, tep_override_comm, tep_is_pid_registered, tep_data_comm_from_pid, tep_data_pid_from_comm, tep_cmdline_pid -
   Manage pid to process name mappings.
</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>

int <strong>tep_register_comm</strong>(struct tep_handle *<em>tep</em>, const char *<em>comm</em>, int <em>pid</em>);
int <strong>tep_override_comm</strong>(struct tep_handle *<em>tep</em>, const char *<em>comm</em>, int <em>pid</em>);
bool <strong>tep_is_pid_registered</strong>(struct tep_handle *<em>tep</em>, int <em>pid</em>);
const char *<strong>tep_data_comm_from_pid</strong>(struct tep_handle *<em>pevent</em>, int <em>pid</em>);
struct cmdline *<strong>tep_data_pid_from_comm</strong>(struct tep_handle *<em>pevent</em>, const char *<em>comm</em>, struct cmdline *<em>next</em>);
int <strong>tep_cmdline_pid</strong>(struct tep_handle *<em>pevent</em>, struct cmdline *<em>cmdline</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 handle the mapping between pid and process name.
The library builds a cache of these mappings, which is used to display the name
of the process, instead of its pid. This information can be retrieved from
tracefs/saved_cmdlines file.</p></div>
<div class="paragraph"><p>The <strong>tep_register_comm()</strong> function registers a <em>pid</em> / process name mapping.
If a command with the same <em>pid</em> is already registered, an error is returned.
The <em>pid</em> argument is the process ID, the <em>comm</em> argument is the process name,
<em>tep</em> is the event context. The <em>comm</em> is duplicated internally.</p></div>
<div class="paragraph"><p>The <strong>tep_override_comm()</strong> function registers a <em>pid</em> / process name mapping.
If a process with the same pid is already registered, the process name string is
udapted with the new one. The <em>pid</em> argument is the process ID, the <em>comm</em>
argument is the process name, <em>tep</em> is the event context. The <em>comm</em> is
duplicated internally.</p></div>
<div class="paragraph"><p>The <strong>tep_is_pid_registered()</strong> function checks if a pid has a process name
mapping registered. The <em>pid</em> argument is the process ID, <em>tep</em> is the event
context.</p></div>
<div class="paragraph"><p>The <strong>tep_data_comm_from_pid()</strong> function returns the process name for a given
pid. The <em>pid</em> argument is the process ID, <em>tep</em> is the event context.
The returned string should not be freed, but will be freed when the <em>tep</em>
handler is closed.</p></div>
<div class="paragraph"><p>The <strong>tep_data_pid_from_comm()</strong> function returns a pid for a given process name.
The <em>comm</em> argument is the process name, <em>tep</em> is the event context.
The argument <em>next</em> is the cmdline structure to search for the next pid.
As there may be more than one pid for a given process, the result of this call
can be passed back into a recurring call in the <em>next</em> parameter, to search for
the next pid. If <em>next</em> is NULL, it will return the first pid associated with
the <em>comm</em>. The function performs a linear search, so it may be slow.</p></div>
<div class="paragraph"><p>The <strong>tep_cmdline_pid()</strong> function returns the pid associated with a given
<em>cmdline</em>. The <em>tep</em> argument is the event context.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>tep_register_comm()</strong> function returns 0 on success. In case of an error -1 is
returned and errno is set to indicate the cause of the problem: ENOMEM, if there
is not enough memory to duplicate the <em>comm</em> or EEXIST if a mapping for this
<em>pid</em> is already registered.</p></div>
<div class="paragraph"><p><strong>tep_override_comm()</strong> function returns 0 on success. In case of an error -1 is
returned and errno is set to indicate the cause of the problem: ENOMEM, if there
is not enough memory to duplicate the <em>comm</em>.</p></div>
<div class="paragraph"><p><strong>tep_is_pid_registered()</strong> function returns true if the <em>pid</em> has a process name
mapped to it, false otherwise.</p></div>
<div class="paragraph"><p><strong>tep_data_comm_from_pid()</strong> function returns the process name as string, or the
string "&lt;&#8230;&gt;" if there is no mapping for the given pid.</p></div>
<div class="paragraph"><p><strong>tep_data_pid_from_comm()</strong> function returns a pointer to a struct cmdline, that
holds a pid for a given process, or NULL if none is found. This result can be
passed back into a recurring call as the <em>next</em> parameter of the function.</p></div>
<div class="paragraph"><p><strong>tep_cmdline_pid()</strong> functions returns the pid for the give cmdline. If <em>cmdline</em>
 is NULL, then -1 is returned.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The following example registers pid for command "ls", in context of event <em>tep</em>
and performs various searches for pid / process name mappings:</p></div>
<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="color: #009900">int</span> ret<span style="color: #990000">;</span>
<span style="color: #009900">int</span> ls_pid <span style="color: #990000">=</span> <span style="color: #993399">1021</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>
        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_register_comm</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"ls"</span><span style="color: #990000">,</span> ls_pid<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">&amp;&amp;</span> errno <span style="color: #990000">==</span> EEXIST<span style="color: #990000">)</span>
                ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_override_comm</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"ls"</span><span style="color: #990000">,</span> ls_pid<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="font-style: italic"><span style="color: #9A1900">/* Failed to register pid / command mapping */</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_is_pid_registered</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> ls_pid<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">/* Command mapping for ls_pid is not registered */</span></span>
        <span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
        <span style="font-weight: bold"><span style="color: #0000FF">const</span></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: #000000">tep_data_comm_from_pid</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> ls_pid<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> <span style="color: #FF0000">{</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Found process name for ls_pid */</span></span>
        <span style="color: #FF0000">}</span>
<span style="color: #990000">...</span>
        <span style="color: #009900">int</span> pid<span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">cmdline</span> <span style="color: #990000">*</span>cmd <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_pid_from_comm</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"ls"</span><span style="color: #990000">,</span> NULL<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">while</span></span> <span style="color: #990000">(</span>cmd<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                pid <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_cmdline_pid</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> cmd<span style="color: #990000">);</span>
                <span style="font-style: italic"><span style="color: #9A1900">/* Found pid for process "ls" */</span></span>
                cmd <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_data_pid_from_comm</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> <span style="color: #FF0000">"ls"</span><span style="color: #990000">,</span> cmd<span style="color: #990000">);</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>-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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<div id="footer-text">
Last updated
 2024-10-11 21:26:45 UTC
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