📄 _setjmp.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>_longjmp</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="_longjmp"></a> <a name="tag_03_03"></a><!-- _longjmp --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_03_01"></a>NAME</h4><blockquote>_longjmp, _setjmp - non-local goto</blockquote><h4><a name="tag_03_03_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <setjmp.h><br><br> void _longjmp(jmp_buf</tt> <i>env</i><tt>, int</tt> <i>val</i><tt>);<br> int _setjmp(jmp_buf</tt> <i>env</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_03_03"></a>DESCRIPTION</h4><blockquote><p>The <i>_longjmp</i>() and <i>_setjmp</i>() functions shall be equivalent to <a href="../functions/longjmp.html"><i>longjmp</i>()</a> and <a href="../functions/setjmp.html"><i>setjmp</i>()</a>, respectively, with theadditional restriction that <i>_longjmp</i>() and <i>_setjmp</i>() shall not manipulate the signal mask.</p><p>If <i>_longjmp</i>() is called even though <i>env</i> was never initialized by a call to <i>_setjmp</i>(), or when the last suchcall was in a function that has since returned, the results are undefined.</p></blockquote><h4><a name="tag_03_03_04"></a>RETURN VALUE</h4><blockquote><p>Refer to <a href="longjmp.html"><i>longjmp</i>()</a> and <a href="setjmp.html"><i>setjmp</i>()</a>.</p></blockquote><h4><a name="tag_03_03_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_03_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_03_07"></a>APPLICATION USAGE</h4><blockquote><p>If <i>_longjmp</i>() is executed and the environment in which <i>_setjmp</i>() was executed no longer exists, errors can occur.The conditions under which the environment of the <i>_setjmp</i>() no longer exists include exiting the function that contains the<i>_setjmp</i>() call, and exiting an inner block with temporary storage. This condition might not be detectable, in which case the<i>_longjmp</i>() occurs and, if the environment no longer exists, the contents of the temporary storage of an inner block areunpredictable. This condition might also cause unexpected process termination. If the function has returned, the results areundefined.</p><p>Passing <a href="../functions/longjmp.html"><i>longjmp</i>()</a> a pointer to a buffer not created by <a href="../functions/setjmp.html"><i>setjmp</i>()</a>, passing <i>_longjmp</i>() a pointer to a buffer not created by <i>_setjmp</i>(),passing <a href="../functions/siglongjmp.html"><i>siglongjmp</i>()</a> a pointer to a buffer not created by <a href="../functions/sigsetjmp.html"><i>sigsetjmp</i>()</a>, or passing any of these three functions a buffer that has been modified bythe user can cause all the problems listed above, and more.</p><p>The <i>_longjmp</i>() and <i>_setjmp</i>() functions are included to support programs written to historical system interfaces.New applications should use <a href="../functions/siglongjmp.html"><i>siglongjmp</i>()</a> and <a href="../functions/sigsetjmp.html"><i>sigsetjmp</i>()</a> respectively.</p></blockquote><h4><a name="tag_03_03_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_03_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>The <i>_longjmp</i>() and <i>_setjmp</i>() functions may be marked LEGACY in a future version.</p></blockquote><h4><a name="tag_03_03_10"></a>SEE ALSO</h4><blockquote><p><a href="longjmp.html"><i>longjmp</i>()</a>, <a href="setjmp.html"><i>setjmp</i>()</a>, <a href="siglongjmp.html"><i>siglongjmp</i>()</a>, <a href="sigsetjmp.html"><i>sigsetjmp</i>()</a>, the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/setjmp.h.html"><i><setjmp.h></i></a></p></blockquote><h4><a name="tag_03_03_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_03_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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