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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) 2001-2003 The Open Group, All Rights Reserved --><title>setjmp</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="setjmp"></a> <a name="tag_03_653"></a><!-- setjmp --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_653_01"></a>NAME</h4><blockquote>setjmp - set jump point for a non-local goto</blockquote><h4><a name="tag_03_653_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/setjmp.h.html">setjmp.h</a>><br><br> int setjmp(jmp_buf</tt> <i>env</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_653_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>A call to <i>setjmp</i>() shall save the calling environment in its <i>env</i> argument for later use by <a href="../functions/longjmp.html"><i>longjmp</i>()</a>.</p><p>It is unspecified whether <i>setjmp</i>() is a macro or a function. If a macro definition is suppressed in order to access anactual function, or a program defines an external identifier with the name <i>setjmp</i>, the behavior is undefined.</p><p>An application shall ensure that an invocation of <i>setjmp</i>() appears in one of the following contexts only:</p><ul><li><p>The entire controlling expression of a selection or iteration statement</p></li><li><p>One operand of a relational or equality operator with the other operand an integral constant expression, with the resultingexpression being the entire controlling expression of a selection or iteration statement</p></li><li><p>The operand of a unary <tt>'!'</tt> operator with the resulting expression being the entire controlling expression of aselection or iteration</p></li><li><p>The entire expression of an expression statement (possibly cast to <b>void</b>)</p></li></ul><p>If the invocation appears in any other context, the behavior is undefined.</p></blockquote><h4><a name="tag_03_653_04"></a>RETURN VALUE</h4><blockquote><p>If the return is from a direct invocation, <i>setjmp</i>() shall return 0. If the return is from a call to <a href="../functions/longjmp.html"><i>longjmp</i>()</a>, <i>setjmp</i>() shall return a non-zero value.</p></blockquote><h4><a name="tag_03_653_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_653_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_653_07"></a>APPLICATION USAGE</h4><blockquote><p>In general, <a href="../functions/sigsetjmp.html"><i>sigsetjmp</i>()</a> is more useful in dealing with errors and interruptsencountered in a low-level subroutine of a program.</p></blockquote><h4><a name="tag_03_653_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_653_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_653_10"></a>SEE ALSO</h4><blockquote><p><a href="longjmp.html"><i>longjmp</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_653_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_653_12"></a>Issue 6</h4><blockquote><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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