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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>kbuffer_timestamp, kbuffer_subbuf_timestamp -
   Functions that read various data of a kbuffer descriptor
</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;kbuffer.h&gt;</strong>

unsigned long long <strong>kbuffer_timestamp</strong>(struct kbuffer *<em>kbuf</em>);
unsigned long long <strong>kbuffer_subbuf_timestamp</strong>(struct kbuffer *<em>kbuf</em>, void *<em>subbuf</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 function <strong>kbuffer_timestamp()</strong> returns the timestamp of the current event of <em>kbuf</em>.</p></div>
<div class="paragraph"><p>The function <strong>kbuffer_subbuf_timestamp()</strong> returns the timestamp for the sub-buffer
that was loaded in <em>kbuf</em>. This usually is (but not guaranteed to be) the timestamp
of the first event on the sub-buffer.</p></div>
<div class="paragraph"><p>The function <strong>kbuffer_start_of_data()</strong> returns the offset of where the delta</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>kbuffer_read_event()</strong> returns the event that the <em>kbuf</em> descriptor is currently at,
or NULL if the last event was passed (by <strong>kbuffer_next_event()</strong>).</p></div>
<div class="paragraph"><p><strong>kbuffer_next_event()</strong> returns the next event after the current event or NULL if there
are no more events.</p></div>
<div class="paragraph"><p><strong>kbuffer_read_at_offset()</strong> returns the event at a given <em>offset</em> from the start of
the sub-buffer stored in <em>kbuf</em>, or NULL if there exists no event. Note, <em>offset</em>
only needs to be an offset that lands on the record, or is at the start of it. It does
not need to be exactly at the beginning of the record.</p></div>
<div class="paragraph"><p><strong>kbuffer_missed_events()</strong> returns 0 if there were no missed events before loaded sub-buffer.
Returns -1 if there were an unknown number of missed events, or if the number of missed events
is known, that number will be returned.</p></div>
<div class="paragraph"><p><strong>kbuffer_event_size()</strong> returns the size of the data payload of the current event of <em>kbuf</em>.</p></div>
<div class="paragraph"><p><strong>kbuffer_curr_size()</strong> returns the size of the entire record of the current event of <em>kbuf</em>.
This includes the size of the meta data for that record.</p></div>
<div class="paragraph"><p><strong>kbuf_curr_offset()</strong> returns the offset of the current record from the beginning of the <em>kbuf</em>
sub-buffer.</p></div>
<div class="paragraph"><p><strong>kbuf_curr_index()</strong> returns the index of the current record from the beginning of the <em>kbuf</em>
data section.</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="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;stdio.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="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;fcntl.h&gt;</span>
<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;unistd.h&gt;</span>
<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;sys/stat.h&gt;</span>

<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;kbuffer.h&gt;</span>

<span style="color: #009900">int</span> <span style="font-weight: bold"><span style="color: #000000">main</span></span> <span style="color: #990000">(</span><span style="color: #009900">int</span> argc<span style="color: #990000">,</span> <span style="color: #009900">char</span> <span style="color: #990000">**</span>argv<span style="color: #990000">)</span>
<span style="color: #FF0000">{</span>
        <span style="color: #009900">unsigned</span> <span style="color: #009900">long</span> <span style="color: #009900">long</span> ts<span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">kbuffer</span> <span style="color: #990000">*</span>kbuf<span style="color: #990000">;</span>
        <span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">stat</span> st<span style="color: #990000">;</span>
        <span style="color: #009900">char</span> <span style="color: #990000">*</span>buf<span style="color: #990000">;</span>
        <span style="color: #009900">void</span> <span style="color: #990000">*</span>event<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> save_offset <span style="color: #990000">=</span> <span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">;</span>
        <span style="color: #009900">int</span> record_size<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> offset<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> index<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> size<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> ret<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> fd<span style="color: #990000">;</span>
        <span style="color: #009900">int</span> i <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span>

        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>argc <span style="color: #990000">&lt;</span> <span style="color: #993399">2</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">printf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"usage: %s raw-subbuffer-page</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> argv<span style="color: #990000">[</span><span style="color: #993399">0</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">" Try: dd count=1 bs=4096 if=/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw of=/tmp/file</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></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-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #000000">stat</span></span><span style="color: #990000">(</span>argv<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">],</span> <span style="color: #990000">&amp;</span>st<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-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"stat"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</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">malloc</span></span><span style="color: #990000">(</span>st<span style="color: #990000">.</span>st_size<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="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Allocating buffer"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>

        fd <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">open</span></span><span style="color: #990000">(</span>argv<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">],</span> O_RDONLY<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>fd <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-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span>argv<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">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>

        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">read</span></span><span style="color: #990000">(</span>fd<span style="color: #990000">,</span> buf<span style="color: #990000">,</span> st<span style="color: #990000">.</span>st_size<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">&lt;</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Reading buffer"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></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-weight: bold"><span style="color: #000000">close</span></span><span style="color: #990000">(</span>fd<span style="color: #990000">);</span>

        kbuf <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_alloc</span></span><span style="color: #990000">(</span>KBUFFER_ENDIAN_SAME_AS_HOST<span style="color: #990000">,</span>
                             KBUFFER_LSIZE_SAME_AS_HOST<span style="color: #990000">);</span>
        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(!</span>kbuf<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Creating kbuffer"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>
        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_load_subbuffer</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">,</span> buf<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">&lt;</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">perror</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Loading sub bufer"</span><span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></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-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span><span style="font-weight: bold"><span style="color: #000000">kbuffer_subbuffer_size</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">)</span> <span style="color: #990000">&gt;</span> st<span style="color: #990000">.</span>st_size<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #000000">fprintf</span></span><span style="color: #990000">(</span>stderr<span style="color: #990000">,</span> <span style="color: #FF0000">"kbuffer is bigger than raw size %d &gt; %ld</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span>
                        <span style="font-weight: bold"><span style="color: #000000">kbuffer_subbuffer_size</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">),</span> st<span style="color: #990000">.</span>st_size<span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #000000">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>

        ret <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_missed_events</span></span><span style="color: #990000">(</span>kbuf<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: #FF0000">{</span>
                <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>ret <span style="color: #990000">&gt;</span> <span style="color: #993399">0</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">"Missed %d events before this buffer</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> ret<span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #0000FF">else</span></span>
                        <span style="font-weight: bold"><span style="color: #000000">printf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"Missed unknown number of events before this buffer</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>
        <span style="font-weight: bold"><span style="color: #0000FF">do</span></span> <span style="color: #FF0000">{</span>
                event <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_read_event</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>ts<span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>event<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                        record_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_size</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                        offset <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_offset</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                        index <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_index</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                        size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_event_size</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>

                        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>i <span style="color: #990000">==</span> <span style="color: #993399">20</span><span style="color: #990000">)</span>
                                save_offset <span style="color: #990000">=</span> offset<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">" event %3d ts:%lld</span><span style="color: #CC33CC">\t</span><span style="color: #FF0000">record_size:%d size:%d</span><span style="color: #CC33CC">\t</span><span style="color: #FF0000">index:%d offset:%d</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span>
                               i<span style="color: #990000">++,</span> ts<span style="color: #990000">,</span> record_size<span style="color: #990000">,</span> size<span style="color: #990000">,</span> index<span style="color: #990000">,</span> offset<span style="color: #990000">);</span>
                        event <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_next_event</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">,</span> NULL<span style="color: #990000">);</span>
                <span style="color: #FF0000">}</span>
        <span style="color: #FF0000">}</span> <span style="font-weight: bold"><span style="color: #0000FF">while</span></span> <span style="color: #990000">(</span>event<span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(!</span>event<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">"Finished sub buffer</span><span style="color: #CC33CC">\n</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>save_offset <span style="color: #990000">&gt;</span> <span style="color: #993399">0</span><span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                event <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_read_at_offset</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">,</span> save_offset<span style="color: #990000">,</span> <span style="color: #990000">&amp;</span>ts<span style="color: #990000">);</span>
                <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(!</span>event<span style="color: #990000">)</span> <span style="color: #FF0000">{</span>
                        <span style="font-weight: bold"><span style="color: #000000">fprintf</span></span><span style="color: #990000">(</span>stderr<span style="color: #990000">,</span> <span style="color: #FF0000">"Funny, can't find event 20 at offset %d</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> save_offset<span style="color: #990000">);</span>
                        <span style="font-weight: bold"><span style="color: #000000">exit</span></span><span style="color: #990000">(-</span><span style="color: #993399">1</span><span style="color: #990000">);</span>
                <span style="color: #FF0000">}</span>
                record_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_size</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                offset <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_offset</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                index <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_curr_index</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>
                size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">kbuffer_event_size</span></span><span style="color: #990000">(</span>kbuf<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">"</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000"> saved event 20 ts:%lld</span><span style="color: #CC33CC">\t</span><span style="color: #FF0000">record_size:%d size:%d</span><span style="color: #CC33CC">\t</span><span style="color: #FF0000">index:%d offset:%d</span><span style="color: #CC33CC">\n\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span>
                       ts<span style="color: #990000">,</span> record_size<span style="color: #990000">,</span> size<span style="color: #990000">,</span> index<span style="color: #990000">,</span> offset<span style="color: #990000">);</span>
        <span style="color: #FF0000">}</span>
        <span style="font-weight: bold"><span style="color: #000000">kbuffer_free</span></span><span style="color: #990000">(</span>kbuf<span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #0000FF">return</span></span> <span style="color: #993399">0</span><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>.</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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