150 lines
5.1 KiB
HTML
150 lines
5.1 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>setjmp</title>
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<basefont size="3"> <a name="setjmp"></a> <a name="tag_03_653"></a><!-- setjmp -->
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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_653_01"></a>NAME</h4>
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<blockquote>setjmp - set jump point for a non-local goto</blockquote>
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<h4><a name="tag_03_653_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/setjmp.h.html">setjmp.h</a>><br>
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<br>
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int setjmp(jmp_buf</tt> <i>env</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_653_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>A call to <i>setjmp</i>() shall save the calling environment in its <i>env</i> argument for later use by <a href=
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"../functions/longjmp.html"><i>longjmp</i>()</a>.</p>
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<p>It is unspecified whether <i>setjmp</i>() is a macro or a function. If a macro definition is suppressed in order to access an
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actual function, or a program defines an external identifier with the name <i>setjmp</i>, the behavior is undefined.</p>
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<p>An application shall ensure that an invocation of <i>setjmp</i>() appears in one of the following contexts only:</p>
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<ul>
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<li>
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<p>The entire controlling expression of a selection or iteration statement</p>
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</li>
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<li>
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<p>One operand of a relational or equality operator with the other operand an integral constant expression, with the resulting
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expression being the entire controlling expression of a selection or iteration statement</p>
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</li>
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<li>
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<p>The operand of a unary <tt>'!'</tt> operator with the resulting expression being the entire controlling expression of a
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selection or iteration</p>
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</li>
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<li>
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<p>The entire expression of an expression statement (possibly cast to <b>void</b>)</p>
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</li>
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</ul>
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<p>If the invocation appears in any other context, the behavior is undefined.</p>
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</blockquote>
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<h4><a name="tag_03_653_04"></a>RETURN VALUE</h4>
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<blockquote>
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<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=
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"../functions/longjmp.html"><i>longjmp</i>()</a>, <i>setjmp</i>() shall return a non-zero value.</p>
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</blockquote>
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<h4><a name="tag_03_653_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_653_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_653_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>In general, <a href="../functions/sigsetjmp.html"><i>sigsetjmp</i>()</a> is more useful in dealing with errors and interrupts
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encountered in a low-level subroutine of a program.</p>
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</blockquote>
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<h4><a name="tag_03_653_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_653_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_653_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="longjmp.html"><i>longjmp</i>()</a> , <a href="sigsetjmp.html"><i>sigsetjmp</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/setjmp.h.html"><i><setjmp.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_653_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_653_12"></a>Issue 6</h4>
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<blockquote>
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<p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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