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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 &lt;event-parse.h&gt;</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">
<pre><tt><span style="color: #990000">...</span>
<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;tracefs.h&gt;</span>
<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;stdlib.h&gt;</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">(&amp;</span>line<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>sz<span style="color: #990000">,</span> fp<span style="color: #990000">))</span> <span style="color: #990000">&gt;=</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> &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;, 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  &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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Name	Size	Permission
libtraceevent-commands.html	29719 bytes	0644
libtraceevent-cpus.html	21389 bytes	0644
libtraceevent-debug.html	23700 bytes	0644
libtraceevent-endian_read.html	21789 bytes	0644
libtraceevent-event_find.html	24754 bytes	0644
libtraceevent-event_get.html	23957 bytes	0644
libtraceevent-event_list.html	25272 bytes	0644
libtraceevent-event_print.html	25548 bytes	0644
libtraceevent-field_find.html	27447 bytes	0644
libtraceevent-field_get_val.html	28250 bytes	0644
libtraceevent-field_print.html	28610 bytes	0644
libtraceevent-field_read.html	23026 bytes	0644
libtraceevent-fields.html	25398 bytes	0644
libtraceevent-file_endian.html	22166 bytes	0644
libtraceevent-filter.html	35978 bytes	0644
libtraceevent-func_apis.html	31736 bytes	0644
libtraceevent-func_find.html	29117 bytes	0644
libtraceevent-handle.html	23854 bytes	0644
libtraceevent-header_page.html	23961 bytes	0644
libtraceevent-host_endian.html	23585 bytes	0644
libtraceevent-kbuffer-create.html	39660 bytes	0644
libtraceevent-kbuffer-read.html	47477 bytes	0644
libtraceevent-kbuffer-timestamp.html	42976 bytes	0644
libtraceevent-kvm-plugin.html	48364 bytes	0644
libtraceevent-log.html	21347 bytes	0644
libtraceevent-long_size.html	21356 bytes	0644
libtraceevent-page_size.html	23185 bytes	0644
libtraceevent-parse-files.html	31025 bytes	0644
libtraceevent-parse_event.html	23696 bytes	0644
libtraceevent-parse_head.html	22352 bytes	0644
libtraceevent-plugins.html	28186 bytes	0644
libtraceevent-record_parse.html	26291 bytes	0644
libtraceevent-reg_event_handler.html	32678 bytes	0644
libtraceevent-reg_print_func.html	30685 bytes	0644
libtraceevent-set_flag.html	23538 bytes	0644
libtraceevent-strerror.html	22495 bytes	0644
libtraceevent-tseq.html	30737 bytes	0644
libtraceevent.html	37316 bytes	0644