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study/Ref-docs/POSIX/susv3/functions/siginterrupt.html
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study/Ref-docs/POSIX/susv3/functions/siginterrupt.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>siginterrupt</title>
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</head>
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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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</script>
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<basefont size="3"> <a name="siginterrupt"></a> <a name="tag_03_687"></a><!-- siginterrupt -->
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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_687_01"></a>NAME</h4>
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<blockquote>siginterrupt - allow signals to interrupt functions</blockquote>
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<h4><a name="tag_03_687_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('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/signal.h.html">signal.h</a>><br>
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<br>
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int siginterrupt(int</tt> <i>sig</i><tt>, int</tt> <i>flag</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"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_687_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>siginterrupt</i>() function shall change the restart behavior when a function is interrupted by the specified signal. The
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function <i>siginterrupt</i>(<i>sig</i>, <i>flag</i>) has an effect as if implemented as:</p>
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<pre>
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<tt>siginterrupt(int sig, int flag) {
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int ret;
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struct sigaction act;
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<br>
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(void) sigaction(sig, NULL, &act);
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if (flag)
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act.sa_flags &= ˜SA_RESTART;
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else
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act.sa_flags |= SA_RESTART;
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ret = sigaction(sig, &act, NULL);
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return ret;
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}
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_687_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>siginterrupt</i>() shall return 0; otherwise, -1 shall be returned and <i>errno</i> set to
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indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_687_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>siginterrupt</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The <i>sig</i> argument is not a valid signal number.</dd>
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</dl>
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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_687_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_687_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>siginterrupt</i>() function supports programs written to historical system interfaces. A conforming application, when
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being written or rewritten, should use <a href="../functions/sigaction.html"><i>sigaction</i>()</a> with the SA_RESTART flag
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instead of <i>siginterrupt</i>().</p>
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</blockquote>
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<h4><a name="tag_03_687_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_687_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_687_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="xsh_chap02_04.html#tag_02_04"><i>Signal Concepts</i></a> , <a href="sigaction.html"><i>sigaction</i>()</a> , the Base
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Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/signal.h.html"><i><signal.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_687_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4, Version 2.</p>
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</blockquote>
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<h4><a name="tag_03_687_12"></a>Issue 5</h4>
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<blockquote>
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<p>Moved from X/OPEN UNIX extension to BASE.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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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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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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<hr size="2" noshade>
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</body>
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</html>
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