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<h1>22. Virtuoso Functions Guide - os_chown</h1>
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<div id="text">
<h2>os_chown</h2>
<div class="refpurpose">changes the owning group/user of a file</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">os_chown</span>
</span>
(<span class="paramdef">in <span class="parameter">path</span> varchar</span>,
<span class="paramdef">in <span class="parameter">username</span> varchar</span>,
<span class="paramdef">in <span class="parameter">groupname</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>This function requires dba privileges.</p>
<p>
<span class="computeroutput">os_chown</span> set the owning user/group of an OS file
by calling the system function chown() with the arguments supplied.</p>
<p>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.</p>
<p>It will return DB NULL value when the function was executed successfully
and the error message as a string if it failed.</p>
<p>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().</p>
<p>The DirsAllowed and DirsDenied lists in Parameters section of the
virtuoso configuration file (virtuoso.ini by default) are used to control
disk access. </p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">path – </span>
<span class="computeroutput">varchar</span> relative path.
</div>
<div class="refsect2">
<span class="refsect2title">username – </span>
<span class="computeroutput">varchar</span> the name of the OS user to own the file.
</div>
<div class="refsect2">
<span class="refsect2title">groupname – </span>
<span class="computeroutput">varchar</span> the name of the OS group to own the file.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_os_chown" />
<div class="example">
<div class="exampletitle">Simple example</div>
<p>Sets the ownership of the virtuoso INI file to virtuoso user and group</p>
<div>
<pre class="screen">
SQL>select os_chown (virtuoso_ini_path(), 'virtuoso', 'virtuoso');
callret
VARCHAR
_______________________________________________________________________________
NULL
</pre>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_file_delete.html">file_delete</a>
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<a href="fn_file_stat.html">file_stat</a>
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<a href="fn_os_chown.html">os_chown</a>
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<a href="fn_virtuoso_ini_path.html">virtuoso_ini_path</a>
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