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<a name="clearerr"></a>
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<p>
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Next: <a href="diprintf.html#diprintf" accesskey="n" rel="next">diprintf</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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<a name="clearerr_002c-clearerr_005funlocked_002d_002d_002dclear-file-or-stream-error-indicator"></a>
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<h3 class="section">4.1 <code>clearerr</code>, <code>clearerr_unlocked</code>—clear file or stream error indicator</h3>
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<a name="index-clearerr"></a>
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<a name="index-clearerr_005funlocked"></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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void clearerr(FILE *<var>fp</var>);
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#define _BSD_SOURCE
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#include <stdio.h>
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void clearerr_unlocked(FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>stdio</code> functions maintain an error indicator with each file
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pointer <var>fp</var>, to record whether any read or write errors have
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occurred on the associated file or stream. Similarly, it maintains an
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end-of-file indicator to record whether there is no more data in the
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file.
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</p>
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<p>Use <code>clearerr</code> to reset both of these indicators.
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</p>
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<p>See <code>ferror</code> and <code>feof</code> to query the two indicators.
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</p>
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<p><code>clearerr_unlocked</code> is a non-thread-safe version of <code>clearerr</code>.
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<code>clearerr_unlocked</code> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the (FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<code>clearerr_unlocked</code> is equivalent to <code>clearerr</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>clearerr</code> does not return a result.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>clearerr</code>.
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</p>
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<p><code>clearerr_unlocked</code> is a BSD extension also provided by GNU libc.
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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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