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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_strerror -
   Returns a string describing regular errno and tep error number.
</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_strerror</strong>(struct tep_handle *<em>tep</em>, enum tep_errno <em>errnum</em>, char *<em>buf</em>, size_t <em>buflen</em>);</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_strerror()</strong> function converts tep error number into a human
readable string.
The <em>tep</em> argument is trace event parser context. The <em>errnum</em> is a regular
errno, defined in errno.h, or a tep error number. The string, describing this
error number is copied in the <em>buf</em> argument. The <em>buflen</em> argument is
the size of the <em>buf</em>.</p></div>
<div class="paragraph"><p>It as a thread safe wrapper around strerror_r(). The library function has two
different behaviors - POSIX and GNU specific. The <strong>tep_strerror()</strong> API always
behaves as the POSIX version - the error string is copied in the user supplied
buffer.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_strerror()</strong> function returns 0, if a valid <em>errnum</em> is passed and the
string is copied into <em>buf</em>. If <em>errnum</em> is not a valid error number,
-1 is returned and <em>buf</em> is not modified.</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="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="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">char</span> buf<span style="color: #990000">[</span><span style="color: #993399">32</span><span style="color: #990000">];</span>
<span style="color: #009900">char</span> <span style="color: #990000">*</span>pool <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">calloc</span></span><span style="color: #990000">(</span><span style="color: #993399">1</span><span style="color: #990000">,</span> <span style="color: #993399">128</span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>tep <span style="color: #990000">==</span> NULL<span style="color: #990000">)</span> <span style="color: #FF0000">{</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> TEP_ERRNO__MEM_ALLOC_FAILED<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">"The pool is not initialized, %s"</span><span style="color: #990000">,</span> buf<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)</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>
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<h2 id="_resources">RESOURCES</h2>
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<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>
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Last updated
 2024-10-11 21:26:45 UTC
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