215 lines
5.5 KiB
HTML
215 lines
5.5 KiB
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 http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>sigemptyset()--Initialize and Empty Signal Set</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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<!-- UNIX5 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Edited by Kersten Feb 02 -->
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<!-- This file has undergone html cleanup on 04/29/02 by JET -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>sigemptyset()--Initialize and Empty Signal Set</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <signal.h>
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int sigemptyset( sigset_t <em>*set</em> );
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</pre>
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<br>
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Service Program Name: QPOSSRV1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>sigemptyset()</strong> function is part of a family of functions
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that manipulate signal sets. <strong>Signal sets</strong> are data objects that
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let a thread keep track of groups of signals. For example, a thread might
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create a signal set to record which signals it is blocking, and another signal
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set to record which signals are pending. Signal sets are used to manipulate
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groups of signals used by other functions (such as <strong>
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sigprocmask()</strong>) or to examine signal sets returned by other functions
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(such as <strong>sigpending()</strong>).</p>
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<p><strong>sigemptyset()</strong> initializes the signal set specified by <em>
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set</em> to an empty set. That is, all supported signals are excluded (see <a
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href="sigactn.htm#TBLSIGTBL1">Control Signals Table</a>).</p>
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<br>
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<!-- Please NOTE: DO NOT DELETE THIS SECTION if this API has no authorities and locks. -->
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<!-- Instead, use the commented out coding below to indicate NONE. -->
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<h3>Authorities and Locks</h3>
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<!-- Use this if there are no authorities and locks. -->
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<p>None.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong><em>*set</em></strong></dt>
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<dd>(Input) A pointer to a signal set.</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top"><strong>sigemptyset()</strong> was
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successful.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Conditions</h3>
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<p>The <strong>sigemptyset()</strong> function does not return an error.</p>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>signal.h</strong>> file (see <a href="unix13.htm">Header
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Files for UNIX-Type Functions</a>)<br>
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<br>
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</li>
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<li><a href="sigactn.htm">sigaction()</a>--Examine and Change Signal Action<br>
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<br>
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</li>
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<li><a href="sigaset.htm">sigaddset()</a>--Add Signal to Signal Set<br>
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<br>
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</li>
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<li><a href="sigdset.htm">sigdelset()</a>--Delete Signal from Signal Set<br>
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<br>
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</li>
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<li><a href="sigfset.htm">sigfillset()</a>--Initialize and Fill Signal Set<br>
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<br>
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</li>
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<li><a href="sigismbr.htm">sigismember()</a>--Test for Signal in Signal Set<br>
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<br>
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</li>
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<li><a href="sigpmsk.htm">sigprocmask()</a>--Examine and Change Blocked
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Signals<br>
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<br>
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</li>
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<li><a href="sigpend.htm">sigpending()</a>--Examine Pending Signals<br>
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<br>
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</li>
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<li><a href="sigsusp.htm">sigsuspend()</a>--Wait for Signal<br>
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<br>
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</li>
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<li><a href="sigtwait.htm">sigtimedwait()</a>--Synchronously Accept a Signal for
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Interval of Time<br>
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<br>
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</li>
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<li><a href="sigwait.htm">sigwait()</a>--Synchronously Accept a Signal<br>
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<br>
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</li>
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<li><a href="sigwaiti.htm">sigwaitinfo()</a>--Synchronously Accept a Signal and
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Signal Data</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example initializes a set of signals to the empty set:</p>
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<pre>
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#include <stdio.h>
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#include <unistd.h>
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#include <signal.h>
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int main( int argc, char *argv[] ) {
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struct sigaction sigact;
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sigset_t sigset;
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sigemptyset( &sigact.sa_mask );
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sigact.sa_flags = 0;
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sigact.sa_handler = SIG_IGN;
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sigaction( SIGUSR2, &sigact, NULL );
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/*
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* Unblocking all signals ensures that the signal
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* handling action will be taken when the signal
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* is generated.
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*/
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sigemptyset( &sigset );
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sigprocmask( SIG_SETMASK, &sigset, NULL );
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printf( "before kill()\n" );
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kill( getpid(), SIGUSR2 );
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printf( "after kill()\n" );
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return( 0 );
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}
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</pre>
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<br>
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<h3>Output:</h3>
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<pre>
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before kill()
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after kill()
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</pre>
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<br>
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<hr>
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API introduced: V3R6
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<hr>
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|
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<center><table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center></body>
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</html>
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