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<a name="g_t_005f_005ffsetlocking_002d_002d_002dset-or-query-locking-mode-on-FILE-stream"></a>
<h3 class="section">4.27 <code>__fsetlocking</code>&mdash;set or query locking mode on FILE stream</h3>
<a name="index-_005f_005ffsetlocking"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
#include &lt;stdio_ext.h&gt;
int __fsetlocking(FILE *<var>fp</var>, int <var>type</var>);

</pre></div>
<p><strong>Description</strong><br>
This function sets how the stdio functions handle locking of FILE <var>fp</var>.
The following values describe <var>type</var>:
</p>
<p><code>FSETLOCKING_INTERNAL</code> is the default state, where stdio functions
automatically lock and unlock the stream.
</p>
<p><code>FSETLOCKING_BYCALLER</code> means that automatic locking in stdio functions
is disabled. Applications which set this take all responsibility for file
locking themselves.
</p>
<p><code>FSETLOCKING_QUERY</code> returns the current locking mode without changing it.
</p>
<br>
<p><strong>Returns</strong><br>
<code>__fsetlocking</code> returns the current locking mode of <var>fp</var>.
</p>
<br>
<p><strong>Portability</strong><br>
This function originates from Solaris and is also provided by GNU libc.
</p>
<p>No supporting OS subroutines are required.
</p>
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