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Profile</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../trace_profile/strace.html" class="active"><strong aria-hidden="true">3.1.</strong> strace</a></li><li class="chapter-item expanded "><a href="../trace_profile/ltrace.html"><strong aria-hidden="true">3.2.</strong> ltrace</a></li><li class="chapter-item expanded "><a href="../trace_profile/perf.html"><strong aria-hidden="true">3.3.</strong> perf</a></li><li class="chapter-item expanded "><a href="../trace_profile/oprofile.html"><strong aria-hidden="true">3.4.</strong> OProfile</a></li><li class="chapter-item expanded "><a href="../trace_profile/time.html"><strong aria-hidden="true">3.5.</strong> time</a></li></ol></li><li class="chapter-item expanded "><a href="../binary/index.html"><strong aria-hidden="true">4.</strong> Binary</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../binary/od.html"><strong aria-hidden="true">4.1.</strong> od</a></li><li class="chapter-item 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                        <h1 id="strace1"><a class="header" href="#strace1">strace(1)</a></h1>
<pre><code class="language-markdown">strace [opts] [prg]
  -f .......... follow child processes on fork(2)
  -p &lt;pid&gt; .... attach to running process
  -s &lt;size&gt; ... max string size, truncate of longer (default: 32)
  -e &lt;expr&gt; ... expression for trace filtering
  -o &lt;file&gt; ... log output into &lt;file&gt;
  -c .......... dump syscall statitics at the end
  -k .......... dump stack trace for each syscall
  -P &lt;path&gt; ... only trace syscall accesing path
  -y .......... print paths for FDs
  -tt ......... print absolute timestamp (with us precision)
  -r .......... print relative timestamp
</code></pre>
<pre><code class="language-markdown">&lt;expr&gt;:
  trace=syscall[,syscall] .... trace only syscall listed
  trace=file ................. trace all syscall that take a filename as arg
  trace=process .............. trace process management related syscalls
  trace=signal ............... trace signal related syscalls
  signal ..................... trace signals delivered to the process
</code></pre>
<h1 id="examples"><a class="header" href="#examples">Examples</a></h1>
<p>Trace <code>open(2)</code> &amp; <code>socket(2)</code> syscalls for a running process + child processes:</p>
<pre><code class="language-markdown">strace -f -e trace=open,socket -p &lt;pid&gt;
</code></pre>
<p>Trace signals delivered to a running process:</p>
<pre><code class="language-markdown">strace -e signal -e 'trace=!all' -p &lt;pid&gt;
</code></pre>

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