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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- splitted from ./en/functions/filesystem.xml, last change in rev 1.2 -->
<refentry id="function.umask">
<refnamediv>
<refname>umask</refname>
<refpurpose>Changes the current umask</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>int</type><methodname>umask</methodname>
<methodparam choice="opt"><type>int</type><parameter>mask</parameter></methodparam>
</methodsynopsis>
<para>
<function>umask</function> sets PHP's umask to
<parameter>mask</parameter> & 0777 and returns the old
umask. When PHP is being used as a server module, the umask
is restored when each request is finished.
</para>
<para>
<function>umask</function> without arguments simply returns the
current umask.
</para>
<note>
<para>
Avoid using this function in multithreaded webservers. It is better to
change the file permissions with <function>chmod</function> after
creating the file. Using <function>umask</function> can lead to
unexpected behavior of concurrently running scripts and the webserver
itself because they all use the same umask.
</para>
</note>
<para>
<example>
<title><function>umask</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$old = umask(0);
chmod("/path/some_dir/some_file.txt", 0755);
umask($old);
// Checking
if ($old != umask()) {
die('An error occured while changing back the umask');
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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