<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.posix-setuid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>posix_setuid</refname>
  <refpurpose>Set the UID of the current process</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>posix_setuid</methodname>
   <methodparam><type>int</type><parameter>user_id</parameter></methodparam>
  </methodsynopsis>
  <para>
   Set the real user ID of the current process. This is a privileged
   function that needs appropriate privileges (usually root) on
   the system to be able to perform this function.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>user_id</parameter></term>
     <listitem>
      <para>
       The user id.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>posix_setuid</function> example</title>
    <para>This example will show the current user id and then set
     it to a different value.</para>
    <programlisting role="php">
<![CDATA[
<?php
echo posix_getuid()."\n"; //10001
echo posix_geteuid()."\n"; //10001
posix_setuid(10000);
echo posix_getuid()."\n"; //10000
echo posix_geteuid()."\n"; //10000
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>posix_setgid</function></member>
    <member><function>posix_seteuid</function></member>
    <member><function>posix_getuid</function></member>
    <member><function>posix_geteuid</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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