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<a name="atexit_002d_002d_002drequest-execution-of-functions-at-program-exit"></a>
<h3 class="section">2.6 <code>atexit</code>&mdash;request execution of functions at program exit</h3>
<a name="index-atexit"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdlib.h&gt;
int atexit (void (*<var>function</var>)(void));

</pre></div>
<p><strong>Description</strong><br>
You can use <code>atexit</code> to enroll functions in a list of functions that
will be called when your program terminates normally.  The argument is
a pointer to a user-defined function (which must not require arguments and
must not return a result).
</p>
<p>The functions are kept in a LIFO stack; that is, the last function
enrolled by <code>atexit</code> will be the first to execute when your program
exits.
</p>
<p>There is no built-in limit to the number of functions you can enroll
in this list; however, after every group of 32 functions is enrolled,
<code>atexit</code> will call <code>malloc</code> to get space for the next part of the
list.   The initial list of 32 functions is statically allocated, so
you can always count on at least that many slots available.
</p>
<br>
<p><strong>Returns</strong><br>
<code>atexit</code> returns <code>0</code> if it succeeds in enrolling your function,
<code>-1</code> if it fails (possible only if no space was available for
<code>malloc</code> to extend the list of functions).
</p>
<br>
<p><strong>Portability</strong><br>
<code>atexit</code> is required by the ANSI standard, which also specifies that
implementations must support enrolling at least 32 functions.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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