165 lines
5.4 KiB
HTML
165 lines
5.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>bsd_signal</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="bsd_signal"></a> <a name="tag_03_40"></a><!-- bsd_signal -->
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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_40_01"></a>NAME</h4>
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<blockquote>bsd_signal - simplified signal facilities</blockquote>
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<h4><a name="tag_03_40_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('OB XSI')">OB 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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void (*bsd_signal(int</tt> <i>sig</i><tt>, void (*</tt><i>func</i><tt>)(int)))(int); <img src="../images/opt-end.gif" alt=
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"[Option End]" 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_40_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>bsd_signal</i>() function provides a partially compatible interface for programs written to historical system interfaces
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(see APPLICATION USAGE).</p>
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<p>The function call <i>bsd_signal</i>(<i>sig</i>, <i>func</i>) shall be equivalent to the following:</p>
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<pre>
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<tt>void (*bsd_signal(int sig, void (*func)(int)))(int)
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{
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struct sigaction act, oact;
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<br>
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act.sa_handler =</tt> <i>func</i><tt>;
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act.sa_flags = SA_RESTART;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask,</tt> <i>sig</i><tt>);
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if (sigaction(</tt><i>sig</i><tt>, &act, &oact) == -1)
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return(SIG_ERR);
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return(oact.sa_handler);
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}
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</tt>
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</pre>
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<p>The handler function should be declared:</p>
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<pre>
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<tt>void handler(int</tt> <i>sig</i><tt>);
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</tt>
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</pre>
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<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,
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or an argument of a different type.</p>
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</blockquote>
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<h4><a name="tag_03_40_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>bsd_signal</i>() shall return the previous action for <i>sig</i>. Otherwise, SIG_ERR shall be
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returned and <i>errno</i> shall be set to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_40_05"></a>ERRORS</h4>
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<blockquote>
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<p>Refer to <a href="sigaction.html"><i>sigaction</i>()</a> .</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_40_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_40_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>This function is a direct replacement for the BSD <a href="../functions/signal.html"><i>signal</i>()</a> function for simple
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applications that are installing a single-argument signal handler function. If a BSD signal handler function is being installed
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that expects more than one argument, the application has to be modified to use <a href=
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"../functions/sigaction.html"><i>sigaction</i>()</a>. The <i>bsd_signal</i>() function differs from <a href=
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"../functions/signal.html"><i>signal</i>()</a> in that the SA_RESTART flag is set and the SA_RESETHAND is clear when
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<i>bsd_signal</i>() is used. The state of these flags is not specified for <a href=
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"../functions/signal.html"><i>signal</i>()</a>.</p>
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<p>It is recommended that new applications use the <a href="../functions/sigaction.html"><i>sigaction</i>()</a> function.</p>
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</blockquote>
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<h4><a name="tag_03_40_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_40_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_40_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="sigaction.html"><i>sigaction</i>()</a> , <a href="sigaddset.html"><i>sigaddset</i>()</a> , <a href=
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"sigemptyset.html"><i>sigemptyset</i>()</a> , <a href="signal.html"><i>signal</i>()</a> , the Base Definitions volume of
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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_40_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_40_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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<h4><a name="tag_03_40_13"></a>Issue 6</h4>
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<blockquote>
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<p>This function is marked obsolescent.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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