<?xml version="1.0"?> <!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> <para> The <function>geteuid</function> function returns a <type>uid_t</type> that contains the user's <emphasis>effective</emphasis> user id. </para>