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<a name="tmpfile_002d_002d_002dcreate-a-temporary-file"></a>
<h3 class="section">4.66 <code>tmpfile</code>&mdash;create a temporary file</h3>
<a name="index-tmpfile"></a>
<a name="index-_005ftmpfile_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
FILE *tmpfile(void);

FILE *_tmpfile_r(struct _reent *<var>reent</var>);

</pre></div>
<p><strong>Description</strong><br>
Create a temporary file (a file which will be deleted automatically),
using a name generated by <code>tmpnam</code>.  The temporary file is opened with
the mode <code>&quot;wb+&quot;</code>, permitting you to read and write anywhere in it
as a binary file (without any data transformations the host system may
perform for text files).
</p>
<p>The alternate function <code>_tmpfile_r</code> is a reentrant version.  The
argument <var>reent</var> is a pointer to a reentrancy structure.
</p>
<br>
<p><strong>Returns</strong><br>
<code>tmpfile</code> normally returns a pointer to the temporary file.  If no
temporary file could be created, the result is NULL, and <code>errno</code>
records the reason for failure.
</p>
<br>
<p><strong>Portability</strong><br>
Both ANSI C and the System V Interface Definition (Issue 2) require
<code>tmpfile</code>.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>getpid</code>,
<code>isatty</code>, <code>lseek</code>, <code>open</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
</p>
<p><code>tmpfile</code> also requires the global pointer <code>environ</code>.
</p>
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