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106 lines
4.1 KiB
HTML
106 lines
4.1 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>fpurge (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<body lang="en">
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<a name="fpurge"></a>
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<div class="header">
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<p>
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Next: <a href="fputc.html#fputc" accesskey="n" rel="next">fputc</a>, Previous: <a href="fopencookie.html#fopencookie" accesskey="p" rel="prev">fopencookie</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="fpurge_002d_002d_002ddiscard-pending-file-I_002fO"></a>
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<h3 class="section">4.19 <code>fpurge</code>—discard pending file I/O</h3>
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<a name="index-fpurge"></a>
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<a name="index-_005ffpurge_005fr"></a>
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<a name="index-_005f_005ffpurge"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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int fpurge(FILE *<var>fp</var>);
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int _fpurge_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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#include <stdio_ext.h>
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void __fpurge(FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use <code>fpurge</code> to clear all buffers of the given stream. For output
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streams, this discards data not yet written to disk. For input streams,
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this discards any data from <code>ungetc</code> and any data retrieved from disk
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but not yet read via <code>getc</code>. This is more severe than <code>fflush</code>,
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and generally is only needed when manually altering the underlying file
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descriptor of a stream.
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</p>
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<p><code>__fpurge</code> behaves exactly like <code>fpurge</code> but does not return a value.
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</p>
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<p>The alternate function <code>_fpurge_r</code> is a reentrant version, where the
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extra argument <var>reent</var> is a pointer to a reentrancy structure, and
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<var>fp</var> must not be NULL.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>fpurge</code> returns <code>0</code> unless <var>fp</var> is not valid, in which case it
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returns <code>EOF</code> and sets <code>errno</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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These functions are not portable to any standard.
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</p>
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<p>No supporting OS subroutines are required.
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</p>
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<br>
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</body>
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</html>
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