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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:47 2005 by faqproc version 2.7 --><!-- from source file osdepmisc.sgml dated Wed Dec 21 13:04:19 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/osdep/sigint.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:04 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 19.38</title><link href="subsecond.html" rev=precedes><link href="fpexcepts.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="subsecond.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="fpexcepts.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 19.38</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I trap or ignorekeyboard interruptslikecontrol-C?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>The basic step is to call <TT>signal</TT>,either as<pre> #include <signal.h> signal(SIGINT, SIG_IGN);</pre>to ignorethe interrupt signal,or as<pre> extern void func(int); signal(SIGINT, func);</pre>to cause control to transfer to function <TT>func</TT>on receipt ofan interrupt signal.<a href="keybintr.html" rel=subdocument>[footnote]</a></p><p>On a multi-tasking system such as Unix,it's best to use a slightly moreinvolvedtechnique:<pre> extern void func(int); if(signal(SIGINT, SIG_IGN) != SIG_IGN) signal(SIGINT, func);</pre>The test and extra callensure that akeyboard interrupttyped in the foreground won't inadvertently interrupt a program running in the background(and it doesn't hurt to code calls to <TT>signal</TT> this way on any system).<a href="pgrps.html" rel=subdocument>[footnote]</a></p><p>On some systems,keyboard interrupthandling is also a function ofthe mode ofthe terminal-input subsystem;see question <a href="cbreak.html">19.1</a>.On somesystems,checking forkeyboard interruptsis only performed when the program is reading input,andkeyboard interrupthandling may therefore depend on which input routines are being called(and <em>whether</em> any input routines are active at all).On MS-DOS systems, <TT>setcbrk</TT>or <TT>ctrlbrk</TT>functionsmay also be involved.</p><p>References:ISO Secs. 7.7,7.7.1<br>H&S Sec. 19.6 pp. 411-3<br>PCS Sec. 12 pp. 210-2<br>POSIX Secs. 3.3.1,3.3.4<br></p><!-- aend --><p><hr><a href="subsecond.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="fpexcepts.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/osdep/sigint.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:04 GMT --></html>⌨️ 快捷键说明
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