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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>bsd_signal</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="bsd_signal"></a> <a name="tag_03_40"></a><!-- bsd_signal --> <!--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_40_01"></a>NAME</h4><blockquote>bsd_signal - simplified signal facilities</blockquote><h4><a name="tag_03_40_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('OB XSI')">OB XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/signal.h.html">signal.h</a>><br><br> void (*bsd_signal(int</tt> <i>sig</i><tt>, void (*</tt><i>func</i><tt>)(int)))(int); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_40_03"></a>DESCRIPTION</h4><blockquote><p>The <i>bsd_signal</i>() function provides a partially compatible interface for programs written to historical system interfaces(see APPLICATION USAGE).</p><p>The function call <i>bsd_signal</i>(<i>sig</i>, <i>func</i>) shall be equivalent to the following:</p><pre><tt>void (*bsd_signal(int sig, void (*func)(int)))(int){ struct sigaction act, oact;<br> act.sa_handler =</tt> <i>func</i><tt>; act.sa_flags = SA_RESTART; sigemptyset(&act.sa_mask); sigaddset(&act.sa_mask,</tt> <i>sig</i><tt>); if (sigaction(</tt><i>sig</i><tt>, &act, &oact) == -1) return(SIG_ERR); return(oact.sa_handler);}</tt></pre><p>The handler function should be declared:</p><pre><tt>void handler(int</tt> <i>sig</i><tt>);</tt></pre><p>where <i>sig</i> is the signal number. The behavior is undefined if <i>func</i> is a function that takes more than one argument,or an argument of a different type.</p></blockquote><h4><a name="tag_03_40_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>bsd_signal</i>() shall return the previous action for <i>sig</i>. Otherwise, SIG_ERR shall bereturned and <i>errno</i> shall be set to indicate the error.</p></blockquote><h4><a name="tag_03_40_05"></a>ERRORS</h4><blockquote><p>Refer to <a href="sigaction.html"><i>sigaction</i>()</a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_40_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_40_07"></a>APPLICATION USAGE</h4><blockquote><p>This function is a direct replacement for the BSD <a href="../functions/signal.html"><i>signal</i>()</a> function for simpleapplications that are installing a single-argument signal handler function. If a BSD signal handler function is being installedthat expects more than one argument, the application has to be modified to use <a href="../functions/sigaction.html"><i>sigaction</i>()</a>. The <i>bsd_signal</i>() function differs from <a href="../functions/signal.html"><i>signal</i>()</a> in that the SA_RESTART flag is set and the SA_RESETHAND is clear when<i>bsd_signal</i>() is used. The state of these flags is not specified for <a href="../functions/signal.html"><i>signal</i>()</a>.</p><p>It is recommended that new applications use the <a href="../functions/sigaction.html"><i>sigaction</i>()</a> function.</p></blockquote><h4><a name="tag_03_40_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_40_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_40_10"></a>SEE ALSO</h4><blockquote><p><a href="sigaction.html"><i>sigaction</i>()</a> , <a href="sigaddset.html"><i>sigaddset</i>()</a> , <a href="sigemptyset.html"><i>sigemptyset</i>()</a> , <a href="signal.html"><i>signal</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/signal.h.html"><i><signal.h></i></a></p></blockquote><h4><a name="tag_03_40_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_40_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p></blockquote><h4><a name="tag_03_40_13"></a>Issue 6</h4><blockquote><p>This function is marked obsolescent.</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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