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<a name="fpurge_002d_002d_002ddiscard-pending-file-I_002fO"></a>
<h3 class="section">4.19 <code>fpurge</code>&mdash;discard pending file I/O</h3>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
int fpurge(FILE *<var>fp</var>);

int _fpurge_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>);

#include &lt;stdio.h&gt;
#include &lt;stdio_ext.h&gt;
void  __fpurge(FILE *<var>fp</var>);

</pre></div>
<p><strong>Description</strong><br>
Use <code>fpurge</code> to clear all buffers of the given stream.  For output
streams, this discards data not yet written to disk.  For input streams,
this discards any data from <code>ungetc</code> and any data retrieved from disk
but not yet read via <code>getc</code>.  This is more severe than <code>fflush</code>,
and generally is only needed when manually altering the underlying file
descriptor of a stream.
</p>
<p><code>__fpurge</code> behaves exactly like <code>fpurge</code> but does not return a value.
</p>
<p>The alternate function <code>_fpurge_r</code> is a reentrant version, where the
extra argument <var>reent</var> is a pointer to a reentrancy structure, and
<var>fp</var> must not be NULL.
</p>
<br>
<p><strong>Returns</strong><br>
<code>fpurge</code> returns <code>0</code> unless <var>fp</var> is not valid, in which case it
returns <code>EOF</code> and sets <code>errno</code>.
</p>
<br>
<p><strong>Portability</strong><br>
These functions are not portable to any standard.
</p>
<p>No supporting OS subroutines are required.
</p>
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