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<a name="feof"></a>
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<p>
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Next: <a href="ferror.html#ferror" accesskey="n" rel="next">ferror</a>, Previous: <a href="fdopen.html#fdopen" accesskey="p" rel="prev">fdopen</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="feof_002c-feof_005funlocked_002d_002d_002dtest-for-end-of-file"></a>
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<h3 class="section">4.7 <code>feof</code>, <code>feof_unlocked</code>—test for end of file</h3>
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<a name="index-feof"></a>
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<a name="index-feof_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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int feof(FILE *<var>fp</var>);
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#define _BSD_SOURCE
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#include <stdio.h>
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int feof_unlocked(FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>feof</code> tests whether or not the end of the file identified by <var>fp</var>
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has been reached.
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</p>
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<p><code>feof_unlocked</code> is a non-thread-safe version of <code>feof</code>.
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<code>feof_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>feof_unlocked</code> is equivalent to <code>feof</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>feof</code> returns <code>0</code> if the end of file has not yet been reached; if
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at end of file, the result is nonzero.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>feof</code> is required by ANSI C.
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</p>
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<p><code>feof_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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