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<a name="on_005fexit"></a>
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<div class="header">
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<p>
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Next: <a href="qsort.html#qsort" accesskey="n" rel="next">qsort</a>, Previous: <a href="mbtowc.html#mbtowc" accesskey="p" rel="prev">mbtowc</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</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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<hr>
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<a name="on_005fexit_002d_002d_002drequest-execution-of-function-with-argument-at-program-exit"></a>
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<h3 class="section">2.31 <code>on_exit</code>—request execution of function with argument at program exit</h3>
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<a name="index-on_005fexit"></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 <stdlib.h>
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int on_exit (void (*<var>function</var>)(int, void *), void *<var>arg</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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You can use <code>on_exit</code> to enroll functions in a list of functions that
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will be called when your program terminates normally. The argument is
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a pointer to a user-defined function which takes two arguments. The
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first is the status code passed to exit and the second argument is of type
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pointer to void. The function must not return a result. The value
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of <var>arg</var> is registered and passed as the argument to <var>function</var>.
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</p>
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<p>The functions are kept in a LIFO stack; that is, the last function
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enrolled by <code>atexit</code> or <code>on_exit</code> will be the first to execute when
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your program exits. You can intermix functions using <code>atexit</code> and
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<code>on_exit</code>.
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</p>
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<p>There is no built-in limit to the number of functions you can enroll
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in this list; however, after every group of 32 functions is enrolled,
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<code>atexit</code>/<code>on_exit</code> will call <code>malloc</code> to get space for the next part
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of the list. The initial list of 32 functions is statically allocated, so
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you can always count on at least that many slots available.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>on_exit</code> returns <code>0</code> if it succeeds in enrolling your function,
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<code>-1</code> if it fails (possible only if no space was available for
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<code>malloc</code> to extend the list of functions).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>on_exit</code> is a non-standard glibc extension
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</p>
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<p>Supporting OS subroutines required: None
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</p>
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<br>
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