136 lines
5.0 KiB
HTML
136 lines
5.0 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>atexit</title>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="atexit"></a> <a name="tag_03_32"></a><!-- atexit -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_32_01"></a>NAME</h4>
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<blockquote>atexit - register a function to run at process termination</blockquote>
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<h4><a name="tag_03_32_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/stdlib.h.html">stdlib.h</a>><br>
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<br>
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int atexit(void (*</tt><i>func</i><tt>)(void));<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_32_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>atexit</i>() function shall register the function pointed to by <i>func</i>, to be called without arguments at normal
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program termination. At normal program termination, all functions registered by the <i>atexit</i>() function shall be called, in
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the reverse order of their registration, except that a function is called after any previously registered functions that had
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already been called at the time it was registered. Normal termination occurs either by a call to <a href=
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"../functions/exit.html"><i>exit</i>()</a> or a return from <i>main</i>().</p>
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<p>At least 32 functions can be registered with <i>atexit</i>().</p>
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<p><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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After a successful call to any of the <i><a href="../functions/exec.html">exec</a></i> functions, any functions previously
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registered by <i>atexit</i>() shall no longer be registered. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_32_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>atexit</i>() shall return 0; otherwise, it shall return a non-zero value.</p>
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</blockquote>
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<h4><a name="tag_03_32_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_32_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_32_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The functions registered by a call to <i>atexit</i>() must return to ensure that all registered functions are called.</p>
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<p>The application should call <a href="../functions/sysconf.html"><i>sysconf</i>()</a> to obtain the value of {ATEXIT_MAX}, the
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number of functions that can be registered. There is no way for an application to tell how many functions have already been
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registered with <i>atexit</i>().</p>
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</blockquote>
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<h4><a name="tag_03_32_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_32_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_32_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="exit.html"><i>exit</i>()</a> , <a href="sysconf.html"><i>sysconf</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_32_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4. Derived from the ANSI C standard.</p>
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</blockquote>
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<h4><a name="tag_03_32_12"></a>Issue 6</h4>
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<blockquote>
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<p>Extensions beyond the ISO C standard are marked.</p>
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<p>The DESCRIPTION is updated for alignment with the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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