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<title>The Red Hat newlib C Library: fdopen</title>
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<a name="fdopen_002d_002d_002dturn-open-file-into-a-stream"></a>
<h3 class="section">4.6 <code>fdopen</code>—turn open file into a stream</h3>
<a name="index-fdopen"></a>
<a name="index-_005ffdopen_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <stdio.h>
FILE *fdopen(int <var>fd</var>, const char *<var>mode</var>);
FILE *_fdopen_r(struct _reent *<var>reent</var>,
int <var>fd</var>, const char *<var>mode</var>);
</pre></div>
<p><strong>Description</strong><br>
<code>fdopen</code> produces a file descriptor of type <code>FILE *</code>, from a
descriptor for an already-open file (returned, for example, by the
system subroutine <code>open</code> rather than by <code>fopen</code>).
The <var>mode</var> argument has the same meanings as in <code>fopen</code>.
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<p><strong>Returns</strong><br>
File pointer or <code>NULL</code>, as for <code>fopen</code>.
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<p><strong>Portability</strong><br>
<code>fdopen</code> is ANSI.
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