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<title>SystemTap: probes/test4/ Directory Reference</title>
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<h1>test4 Directory Reference</h1>This example probe tracks file opens, reads and writes.  
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Files</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">file &nbsp;</td><td class="memItemRight" valign="bottom"><b>dtr.c</b> <a href="test4_2dtr_8c-source.html">[code]</a></td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">file &nbsp;</td><td class="memItemRight" valign="bottom"><b>dtr.mod.c</b> <a href="dtr_8mod_8c-source.html">[code]</a></td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">file &nbsp;</td><td class="memItemRight" valign="bottom"><b>nrec.c</b> <a href="nrec_8c-source.html">[code]</a></td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">file &nbsp;</td><td class="memItemRight" valign="bottom"><b>README</b> <a href="probes_2test4_2README-source.html">[code]</a></td></tr>

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<hr><a name="_details"></a><h2>Detailed Description</h2>
This example probe tracks file opens, reads and writes. 
<p>
It demonstrates maps, stats, and iterators.<p>
This is a translation of on an old dtr probe. Original source is <div class="fragment"><pre class="fragment">
global {
  long @opens[string];
  sum @reads[string], @writes[string];
}

probe sys_open:entry {
  @opens[current-&gt;comm]++;
}

probe sys_read:entry {
  @reads[current-&gt;comm] &lt;&lt; count;
}

probe sys_write:entry {
  @writes[current-&gt;comm] &lt;&lt; count;
}
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