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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace_seq_init, trace_seq_destroy, trace_seq_reset, trace_seq_terminate, trace_seq_putc, trace_seq_puts, trace_seq_printf, trace_seq_vprintf, trace_seq_do_fprintf, trace_seq_do_printf -
   Initialize / destroy a trace sequence.
</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>
<strong>#include &lt;trace-seq.h&gt;</strong>

void <strong>trace_seq_init</strong>(struct trace_seq *<em>s</em>);
void <strong>trace_seq_destroy</strong>(struct trace_seq *<em>s</em>);
void <strong>trace_seq_reset</strong>(struct trace_seq *<em>s</em>);
void <strong>trace_seq_terminate</strong>(struct trace_seq *<em>s</em>);
int <strong>trace_seq_putc</strong>(struct trace_seq *<em>s</em>, unsigned char <em>c</em>);
int <strong>trace_seq_puts</strong>(struct trace_seq *<em>s</em>, const char *<em>str</em>);
int <strong>trace_seq_printf</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, <em>&#8230;</em>);
int <strong>trace_seq_vprintf</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, va_list <em>args</em>);
int <strong>trace_seq_do_printf</strong>(struct trace_seq *<em>s</em>);
int <strong>trace_seq_do_fprintf</strong>(struct trace_seq *<em>s</em>, FILE *<em>fp</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Trace sequences are used to allow a function to call several other functions
to create a string of data to use.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_init()</strong> function initializes the trace sequence <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_destroy()</strong> function destroys the trace sequence <em>s</em> and frees
all its resources that it had used.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_reset()</strong> function re-initializes the trace sequence <em>s</em>. All
characters already written in <em>s</em> will be deleted.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_terminate()</strong> function terminates the trace sequence <em>s</em>. It puts
the null character '\0' at the end of the buffer.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_putc()</strong> function puts a single character <em>c</em> in the trace
sequence <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_puts()</strong> function puts a NULL terminated string <em>str</em> in the
trace sequence <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_printf()</strong> function puts a formated string <em>fmt _with
variable arguments _&#8230;</em> in the trace sequence <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_vprintf()</strong> function puts a formated string <em>fmt _with
list of arguments _args</em> in the trace sequence <em>s</em>.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_do_printf()</strong> function prints the buffer of trace sequence <em>s</em> to
the standard output stdout.</p></div>
<div class="paragraph"><p>The <strong>trace_seq_do_fprintf()</strong> function prints the buffer of trace sequence <em>s</em>
to the given file <em>fp</em>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>Both <strong>trace_seq_putc()</strong> and <strong>trace_seq_puts()</strong> functions return the number of
characters put in the trace sequence, or 0 in case of an error</p></div>
<div class="paragraph"><p>Both <strong>trace_seq_printf()</strong> and <strong>trace_seq_vprintf()</strong> functions return 0 if the
trace oversizes the buffer&#8217;s free space, the number of characters printed, or
a negative value in case of an error.</p></div>
<div class="paragraph"><p>Both <strong>trace_seq_do_printf()</strong> and <strong>trace_seq_do_fprintf()</strong> functions return the
number of printed characters, 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="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;trace-seq.h&gt;</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> seq<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000000">trace_seq_init</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">);</span>
<span style="color: #990000">...</span>
<span style="color: #009900">void</span> <span style="font-weight: bold"><span style="color: #000000">foo_seq_print</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>tseq<span style="color: #990000">,</span> <span style="color: #009900">char</span> <span style="color: #990000">*</span>format<span style="color: #990000">,</span> <span style="color: #990000">...)</span>
<span style="color: #FF0000">{</span>
        <span style="color: #008080">va_list</span> ap<span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #000000">va_start</span></span><span style="color: #990000">(</span>ap<span style="color: #990000">,</span> format<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">trace_seq_vprintf</span></span><span style="color: #990000">(</span>tseq<span style="color: #990000">,</span> format<span style="color: #990000">,</span> ap<span style="color: #990000">)</span> <span style="color: #990000">&lt;=</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 print in the trace sequence */</span></span>
        <span style="color: #FF0000">}</span>
        <span style="font-weight: bold"><span style="color: #000000">va_end</span></span><span style="color: #990000">(</span>ap<span style="color: #990000">);</span>
<span style="color: #FF0000">}</span>

<span style="font-weight: bold"><span style="color: #000000">trace_seq_reset</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">);</span>

<span style="color: #009900">char</span> <span style="color: #990000">*</span>str <span style="color: #990000">=</span> <span style="color: #FF0000">" MAN page example"</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">trace_seq_puts</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">,</span> str<span style="color: #990000">)</span> <span style="color: #990000">!=</span> <span style="font-weight: bold"><span style="color: #000000">strlen</span></span><span style="color: #990000">(</span>str<span style="color: #990000">))</span> <span style="color: #FF0000">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Failed to put str in the trace sequence */</span></span>
<span style="color: #FF0000">}</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">trace_seq_putc</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">,</span> <span style="color: #FF0000">':'</span><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">{</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Failed to put ':' in the trace sequence */</span></span>
<span style="color: #FF0000">}</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">trace_seq_printf</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">,</span> <span style="color: #FF0000">" trace sequence: %d"</span><span style="color: #990000">,</span> <span style="color: #993399">1</span><span style="color: #990000">)</span> <span style="color: #990000">&lt;=</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 print in the trace sequence */</span></span>
<span style="color: #FF0000">}</span>
<span style="font-weight: bold"><span style="color: #000000">foo_seq_print</span></span><span style="color: #990000">(</span> <span style="color: #990000">&amp;</span>seq<span style="color: #990000">,</span> <span style="color: #FF0000">"  %d</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> <span style="color: #993399">2</span><span style="color: #990000">);</span>

<span style="font-weight: bold"><span style="color: #000000">trace_seq_terminate</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">);</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">trace_seq_do_printf</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">)</span> <span style="color: #990000">&lt;</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 print the sequence buffer to the standard output */</span></span>
<span style="color: #FF0000">}</span>
<span style="color: #008080">FILE</span> <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">"trace.txt"</span><span style="color: #990000">,</span> <span style="color: #FF0000">"w"</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">trace_seq_do_fprintf</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">,</span> fp<span style="color: #990000">)</span> <span style="color: #990000">&lt;</span> <span style="color: #993399">0</span> <span style="color: #990000">)</span> <span style="color: #990000">[</span>
        <span style="font-style: italic"><span style="color: #9A1900">/* Failed to print the sequence buffer to the trace.txt file */</span></span>
<span style="color: #FF0000">}</span>

<span style="font-weight: bold"><span style="color: #000000">trace_seq_destroy</span></span><span style="color: #990000">(&amp;</span>seq<span style="color: #990000">);</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.
<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>
<div id="footer">
<div id="footer-text">
Last updated
 2022-03-24 23:40:51 UTC
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