175 lines
7.4 KiB
HTML
175 lines
7.4 KiB
HTML
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<title>sigsetjmp</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="sigsetjmp"></a> <a name="tag_03_697"></a><!-- sigsetjmp -->
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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_697_01"></a>NAME</h4>
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<blockquote>sigsetjmp - set jump point for a non-local goto</blockquote>
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<h4><a name="tag_03_697_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/setjmp.h.html">setjmp.h</a>><br>
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<br>
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int sigsetjmp(sigjmp_buf</tt> <i>env</i><tt>, int</tt> <i>savemask</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_697_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>sigsetjmp</i>() function shall be equivalent to the <a href="../functions/setjmp.html"><i>setjmp</i>()</a> function,
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except as follows:</p>
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<ul>
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<li>
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<p>References to <a href="../functions/setjmp.html"><i>setjmp</i>()</a> are equivalent to <i>sigsetjmp</i>().</p>
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</li>
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<li>
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<p>References to <a href="../functions/longjmp.html"><i>longjmp</i>()</a> are equivalent to <a href=
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"../functions/siglongjmp.html"><i>siglongjmp</i>()</a>.</p>
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</li>
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<li>
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<p>If the value of the <i>savemask</i> argument is not 0, <i>sigsetjmp</i>() shall also save the current signal mask of the calling
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thread as part of the calling environment.</p>
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</li>
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</ul>
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</blockquote>
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<h4><a name="tag_03_697_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If the return is from a successful direct invocation, <i>sigsetjmp</i>() shall return 0. If the return is from a call to <a
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href="../functions/siglongjmp.html"><i>siglongjmp</i>()</a>, <i>sigsetjmp</i>() shall return a non-zero value.</p>
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</blockquote>
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<h4><a name="tag_03_697_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_697_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_697_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The distinction between <a href="../functions/setjmp.html"><i>setjmp</i>()</a>/ <a href=
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"../functions/longjmp.html"><i>longjmp</i>()</a> and <i>sigsetjmp</i>()/ <a href=
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"../functions/siglongjmp.html"><i>siglongjmp</i>()</a> is only significant for programs which use <a href=
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"../functions/sigaction.html"><i>sigaction</i>()</a>, <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a>, or <a href=
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"../functions/sigsuspend.html"><i>sigsuspend</i>()</a>.</p>
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<p>Note that since this function is defined in terms of <a href="../functions/setjmp.html"><i>setjmp</i>()</a>, if <i>savemask</i>
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is zero, it is unspecified whether the signal mask is saved.</p>
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</blockquote>
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<h4><a name="tag_03_697_08"></a>RATIONALE</h4>
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<blockquote>
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<p>The ISO C standard specifies various restrictions on the usage of the <a href=
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"../functions/setjmp.html"><i>setjmp</i>()</a> macro in order to permit implementors to recognize the name in the compiler and not
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implement an actual function. These same restrictions apply to the <i>sigsetjmp</i>() macro.</p>
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<p>There are processors that cannot easily support these calls, but this was not considered a sufficient reason to exclude
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them.</p>
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<p>4.2 BSD, 4.3 BSD, and XSI-conformant systems provide functions named <a href="../functions/_setjmp.html"><i>_setjmp</i>()</a>
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and <a href="../functions/_longjmp.html"><i>_longjmp</i>()</a> that, together with <a href=
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"../functions/setjmp.html"><i>setjmp</i>()</a> and <a href="../functions/longjmp.html"><i>longjmp</i>()</a>, provide the same
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functionality as <i>sigsetjmp</i>() and <a href="../functions/siglongjmp.html"><i>siglongjmp</i>()</a>. On those systems, <a href=
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"../functions/setjmp.html"><i>setjmp</i>()</a> and <a href="../functions/longjmp.html"><i>longjmp</i>()</a> save and restore signal
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masks, while <a href="../functions/_setjmp.html"><i>_setjmp</i>()</a> and <a href=
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"../functions/_longjmp.html"><i>_longjmp</i>()</a> do not. On System V Release 3 and in corresponding issues of the SVID, <a href=
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"../functions/setjmp.html"><i>setjmp</i>()</a> and <a href="../functions/longjmp.html"><i>longjmp</i>()</a> are explicitly defined
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not to save and restore signal masks. In order to permit existing practice in both cases, the relation of <a href=
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"../functions/setjmp.html"><i>setjmp</i>()</a> and <a href="../functions/longjmp.html"><i>longjmp</i>()</a> to signal masks is not
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specified, and a new set of functions is defined instead.</p>
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<p>The <a href="../functions/longjmp.html"><i>longjmp</i>()</a> and <a href="../functions/siglongjmp.html"><i>siglongjmp</i>()</a>
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functions operate as in the previous issue provided the matching <a href="../functions/setjmp.html"><i>setjmp</i>()</a> or
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<i>sigsetjmp</i>() has been performed in the same thread. Non-local jumps into contexts saved by other threads would be at best a
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questionable practice and were not considered worthy of standardization.</p>
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</blockquote>
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<h4><a name="tag_03_697_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_697_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="siglongjmp.html"><i>siglongjmp</i>()</a> , <a href="signal.html"><i>signal</i>()</a> , <a href=
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"sigprocmask.html"><i>sigprocmask</i>()</a> , <a href="sigsuspend.html"><i>sigsuspend</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_697_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p>
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</blockquote>
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<h4><a name="tag_03_697_12"></a>Issue 5</h4>
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<blockquote>
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<p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p>
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</blockquote>
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<h4><a name="tag_03_697_13"></a>Issue 6</h4>
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<blockquote>
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<p>The DESCRIPTION is reworded in terms of <a href="../functions/setjmp.html"><i>setjmp</i>()</a>.</p>
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<p>The SYNOPSIS is marked CX since the presence of this function in the <a href=
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"../basedefs/setjmp.h.html"><i><setjmp.h></i></a> header is an extension over the ISO C 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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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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