s/fseek.html">fseek(3)</a>, depending on the
    <var class="Ar">whence</var> argument, the <var class="Ar">offset</var> is
    counted relative from:</p>
<div class="Bd-indent">
<dl class="Bl-tag">
  <dt id="SEEK_SET"><a class="permalink" href="#SEEK_SET"><code class="Dv">SEEK_SET</code></a></dt>
  <dd>start of file</dd>
  <dt id="SEEK_CUR"><a class="permalink" href="#SEEK_CUR"><code class="Dv">SEEK_CUR</code></a></dt>
  <dd>current write offset in file</dd>
  <dt id="SEEK_END"><a class="permalink" href="#