&lt;!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"&gt;
&lt;para&gt;
The &lt;function&gt;open&lt;/function&gt; function returns &lt;returnvalue&gt;2&lt;/returnvalue&gt;
(&lt;errorname&gt;ENOFILE&lt;/errorname&gt;) if the file does not exist.
&lt;/para&gt;