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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_parse_saved_cmdlines, tep_parse_printk_formats, tep_parse_kallsyms -
Parsing functions to load 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 <event-parse.h></strong>
int <strong>tep_parse_saved_cmdlines</strong>(struct tep_handle *<em>tep</em>, const char *<em>buf</em>);
int <strong>tep_parse_printk_formats</strong>(struct tep_handle *<em>tep</em>, const char *<em>buf</em>);
int <strong>tep_parse_kallsyms</strong>(struct tep_handle *<em>tep</em>, const char *<em>buf</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>tep_parse_saved_cmdlines()</strong> is a helper function to parse content in the tracefs
file system of the "saved_cmdlines" file (stored in a string buffer passed in by <em>buf</em>)
and loads the mapping of the process IDs (pid) to the comm names in the
<em>tep</em> handler. The events store the pid and this is used to be able to show the
process names associated to those process ids. It parses the string <em>buf</em> that
holds the content of saved_cmdlines and ends with a nul character (<em>\0</em>).</p></div>
<div class="paragraph"><p><strong>tep_parse_printk_formats()</strong> is a helper function to parse content in the tracefs
file system of the "printk_formats" file (stored in a string buffer passed in by <em>buf</em>)
and loads the mapping of addresses of strings that may be referenced by events.
Events only store the address of constant strings in the kernel, and the mapping
of their address to the string is exported to user space in the printk_formats
file. It parses the string <em>buf</em> that holds the content of printk_formats and
ends with a nul character (<em>\0</em>).</p></div>
<div class="paragraph"><p><strong>tep_parse_kallsyms()</strong> is a helper function to parse the Linux kernel /proc/kallsyms format
(stored in a string buffer passed in by <em>buf</em>) and load the functions into the
<em>tep</em> handler such that function IP addresses can be mapped to their name when
parsing events with %pS in the print format field. It parses the string <em>buf</em> that
holds the content of /proc/kallsyms and ends with a nul character (<em>\0</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_parse_saved_cmdlines</strong>() function returns 0 in case of success, or -1
in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_parse_printk_formats</strong>() function returns 0 in case of success, or -1
in case of an error.</p></div>
<div class="paragraph"><p>The <strong>tep_parse_kallsyms</strong>() function returns 0 in case of success, 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"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">...</span>
<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"><tracefs.h></span>
<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000"><stdlib.h></span>
<span style="color: #009900">int</span> <span style="font-weight: bold"><span style="color: #000000">load_cmdlines</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="color: #FF0000">{</span>
<span style="color: #009900">char</span> <span style="color: #990000">*</span>buf <span style="color: #990000">=</span> NULL<span style="color: #990000">;</span>
<span style="color: #009900">int</span> r<span style="color: #990000">;</span>
buf <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tracefs_instance_file_read</span></span><span style="color: #990000">(</span>NULL<span style="color: #990000">,</span> <span style="color: #FF0000">"saved_cmdlines"</span><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>buf<span style="color: #990000">)</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> <span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">;</span>
r <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_parse_saved_cmdlines</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">free</span></span><span style="color: #990000">(</span>buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> r<span style="color: #990000">;</span>
<span style="color: #FF0000">}</span>
<span style="color: #009900">int</span> <span style="font-weight: bold"><span style="color: #000000">load_print_strings</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="color: #FF0000">{</span>
<span style="color: #009900">char</span> <span style="color: #990000">*</span>buf <span style="color: #990000">=</span> NULL<span style="color: #990000">;</span>
<span style="color: #009900">int</span> r<span style="color: #990000">;</span>
buf <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tracefs_instance_file_read</span></span><span style="color: #990000">(</span>NULL<span style="color: #990000">,</span> <span style="color: #FF0000">"printk_formats"</span><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>buf<span style="color: #990000">)</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> <span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">;</span>
r <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_parse_printk_formats</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">free</span></span><span style="color: #990000">(</span>buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> r<span style="color: #990000">;</span>
<span style="color: #FF0000">}</span>
<span style="color: #009900">int</span> <span style="font-weight: bold"><span style="color: #000000">load_kallsyms</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="color: #FF0000">{</span>
<span style="color: #009900">char</span> <span style="color: #990000">*</span>line <span style="color: #990000">=</span> NULL<span style="color: #990000">;</span>
<span style="color: #009900">char</span> <span style="color: #990000">*</span>buf <span style="color: #990000">=</span> NULL<span style="color: #990000">;</span>
<span style="color: #008080">size_t</span> sz <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span>
<span style="color: #008080">FILE</span> <span style="color: #990000">*</span>fp<span style="color: #990000">;</span>
<span style="color: #009900">int</span> len <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span>
<span style="color: #009900">int</span> r<span style="color: #990000">;</span>
fp <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">fopen</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"/proc/kallsyms"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"r"</span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">while</span></span> <span style="color: #990000">((</span>r <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">getline</span></span><span style="color: #990000">(&</span>line<span style="color: #990000">,</span> <span style="color: #990000">&</span>sz<span style="color: #990000">,</span> fp<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>
buf <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">realloc</span></span><span style="color: #990000">(</span>buf<span style="color: #990000">,</span> len <span style="color: #990000">+</span> r <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">memcpy</span></span><span style="color: #990000">(</span>buf <span style="color: #990000">+</span> len<span style="color: #990000">,</span> line<span style="color: #990000">,</span> r<span style="color: #990000">);</span>
len <span style="color: #990000">+=</span> r<span style="color: #990000">;</span>
<span style="color: #FF0000">}</span>
<span style="font-weight: bold"><span style="color: #000000">free</span></span><span style="color: #990000">(</span>line<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">fclose</span></span><span style="color: #990000">(</span>fp<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(!</span>buf<span style="color: #990000">)</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> <span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">;</span>
buf<span style="color: #990000">[</span>len<span style="color: #990000">]</span> <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span>
r <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_parse_kallsyms</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #000000">free</span></span><span style="color: #990000">(</span>buf<span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">return</span></span> r<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>-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), <strong>tep_register_comm</strong>(3), <strong>tep_register_function</strong>(3),
<strong>tep_register_print_string</strong>(3)</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>>, coauthor of <strong>libtraceevent</strong>.</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">
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2022-03-24 23:40:51 UTC
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