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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_os_chown">
<refmeta>
<refentrytitle>os_chown</refentrytitle>
<refmiscinfo>file</refmiscinfo>
</refmeta>
<refnamediv>
<refname>os_chown</refname>
<refpurpose>changes the owning group/user of a file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_os_chown">
<funcprototype id="fproto_os_chown">
<funcdef><function>os_chown</function></funcdef>
<paramdef>in <parameter>path</parameter> varchar</paramdef>
<paramdef>in <parameter>username</parameter> varchar</paramdef>
<paramdef>in <parameter>groupname</parameter> varchar</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_os_chown"><title>Description</title>
<para>This function requires dba privileges.</para>
<para><function>os_chown</function> set the owning user/group of an OS file
by calling the system function chown() with the arguments supplied.</para>
<para>Not all the host OSes support the concept of owner users and groups.
That's why the function will not throw an SQL error if it fails.</para>
<para>It will return DB NULL value when the function was executed successfully
and the error message as a string if it failed.</para>
<para>The function first looks up the user and group name supplied into the
OS database to get the user and group IDs. it then calls the system function
chown().</para>
<para>The DirsAllowed and DirsDenied lists in Parameters section of the
virtuoso configuration file (virtuoso.ini by default) are used to control
disk access. </para>
</refsect1>
<refsect1 id="params"><title>Parameters</title>
<refsect2><title>path</title>
<para><type>varchar</type> relative path.</para>
</refsect2>
<refsect2><title>username</title>
<para><type>varchar</type> the name of the OS user to own the file.</para>
</refsect2>
<refsect2><title>groupname</title>
<para><type>varchar</type> the name of the OS group to own the file.</para>
</refsect2>
</refsect1>
<refsect1 id="examples"><title>Examples</title>
<example id="ex_os_chown"><title>Simple example</title>
<para>Sets the ownership of the virtuoso INI file to virtuoso user and group</para>
<screen>
SQL>select os_chown (virtuoso_ini_path(), 'virtuoso', 'virtuoso');
callret
VARCHAR
_______________________________________________________________________________
NULL
</screen>
</example>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para><link linkend="fn_file_delete"><function>file_delete</function></link></para>
<para><link linkend="fn_file_stat"><function>file_stat</function></link></para>
<para><link linkend="fn_os_chown"><function>os_chown</function></link></para>
<para><link linkend="fn_virtuoso_ini_path"><function>virtuoso_ini_path</function></link></para>
</refsect1>
</refentry>
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