258 lines
6.6 KiB
HTML
258 lines
6.6 KiB
HTML
<!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>sigaddset()--Add Signal to 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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<!--End Header Records --><!-- Edited by Kersten Feb 02 -->
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<!-- This file has undergone error condition cleanup on 04/30/02 by JET -->
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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>sigaddset()--Add Signal to 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 sigaddset( sigset_t <em>*set</em>, int <em>signo</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>sigaddset()</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>sigaddset()</strong> adds a signal to the set of signals already
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recorded in <em>set</em>.</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.<br>
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<br>
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</dd>
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<dt><strong><em>signo</em></strong></dt>
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<dd>(Input) A signal from the list defined in <a href="sigactn.htm#TBLSIGTBL1">
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Control Signals Table</a>.</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>sigaddset()</strong> successfully added
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to the signal set.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-1</em></td>
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<td align="left" valign="top"><strong>sigaddset()</strong> was not successful.
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The <em>errno</em> variable is set to indicate the error.</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>If <strong>sigaddset()</strong> is not successful, <em>errno</em> usually
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indicates the following error. Under some conditions, <em>errno</em> could
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indicate an error other than that listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd>
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<p>The value specified for the argument is not correct.</p>
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<p>A function was passed incorrect argument values, or an operation was
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attempted on an object and the operation specified is not supported for that
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type of object.</p>
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<p>An argument value is not valid, out of range, or NULL.</p>
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<p>The value of <em>signo</em> is not within the range of valid signals or
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specifies a signal that is not supported.</p>
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</dd>
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</dl>
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<br>
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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="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="sigeset.htm">sigemptyset()</a>--Initialize and Empty Signal
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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
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for 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 adds a signal to a set of signals:</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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void catcher( int sig ) {
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printf( "catcher() has gained control\n" );
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}
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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 = catcher;
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sigaction( SIGUSR1, &sigact, NULL );
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printf( "before first kill()\n" );
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kill( getpid(), SIGUSR1 );
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/*
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* Blocking SIGUSR1 signals prevents the signals
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* from being delivered until they are unblocked,
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* so the catcher will not gain control.
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*/
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGUSR1 );
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sigprocmask( SIG_SETMASK, &sigset, NULL );
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printf( "before second kill()\n" );
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kill( getpid(), SIGUSR1 );
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printf( "after second 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 first kill()
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catcher() has gained control
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before second kill()
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after second 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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<center>
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<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>
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</body>
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</html>
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