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<a name="exit_002d_002d_002dend-program-execution"></a>
<h3 class="section">2.17 <code>exit</code>&mdash;end program execution</h3>
<a name="index-exit"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdlib.h&gt;
void exit(int <var>code</var>);

</pre></div>
<p><strong>Description</strong><br>
Use <code>exit</code> to return control from a program to the host operating
environment.  Use the argument <var>code</var> to pass an exit status to the
operating environment: two particular values, <code>EXIT_SUCCESS</code> and
<code>EXIT_FAILURE</code>, are defined in &lsquo;<code>stdlib.h</code>&rsquo; to indicate success or
failure in a portable fashion.
</p>
<p><code>exit</code> does two kinds of cleanup before ending execution of your
program.  First, it calls all application-defined cleanup functions
you have enrolled with <code>atexit</code>.  Second, files and streams are
cleaned up: any pending output is delivered to the host system, each
open file or stream is closed, and files created by <code>tmpfile</code> are
deleted.
</p>
<br>
<p><strong>Returns</strong><br>
<code>exit</code> does not return to its caller.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>exit</code>, and specifies that <code>EXIT_SUCCESS</code> and
<code>EXIT_FAILURE</code> must be defined.
</p>
<p>Supporting OS subroutines required: <code>_exit</code>.
</p>
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