s="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">already_open</span></dt>
<dd><p>
              Already open.
            </p></dd>
<dt><span class="term">eof</span></dt>
<dd><p>
              End of file or stream.
            </p></dd>
<dt><span class="term">not_found</span></dt>
<dd><p>
              Element not found.
            </p></dd>
<dt><span class="term">fd_set_failure</span></dt>
<dd><p>
              The descriptor cannot fit into the select system call's fd_set.
    