&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;geteuid&lt;/function&gt; function returns a &lt;type&gt;uid_t&lt;/type&gt; that
contains the user's &lt;emphasis&gt;effective&lt;/emphasis&gt; user id.
&lt;/para&gt;