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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/basic_signals_8c_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/PIPS/posixsignals/basicSignals/basicSignals.c Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/PIPS/posixsignals/basicSignals/basicSignals.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// basicSignals.c</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span>
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<a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00006"></a>00006 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00008"></a>00008 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00009"></a>00009 <span class="comment">//</span>
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<a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span>
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<a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Contributors:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015 <span class="comment">// Description:This example demonstrates the basic signal functionality .</span>
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<a name="l00016"></a>00016 <span class="comment">//</span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
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<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
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<a name="l00020"></a>00020 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
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<a name="l00021"></a>00021 <span class="preprocessor">#include &lt;sys/types.h&gt;</span>
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<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;signal.h&gt;</span>      <span class="comment">//The header for signal functionality.</span>
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<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;time.h&gt;</span>        <span class="comment">//The header for timer functionality.</span>
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<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;e32def.h&gt;</span>
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<a name="l00025"></a>00025
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<a name="l00026"></a>00026 <span class="keywordtype">char</span> <span class="keyword">const</span> *gstr = <span class="stringliteral">&quot;\nPress &#39;7&#39;+Enter to return to the options menu or &#39;e&#39;+ENTER to exit the example\n&quot;</span>;
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<a name="l00027"></a>00027 <span class="keywordtype">char</span> <span class="keyword">const</span> *gnote = <span class="stringliteral">&quot;\nPress the Enter key to proceed with the use case\n&quot;</span>;
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<a name="l00028"></a>00028
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<a name="l00032"></a>00032 <span class="keywordtype">void</span> PressKey()
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<a name="l00033"></a>00033         {
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<a name="l00034"></a>00034         fflush(stdout);
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<a name="l00035"></a>00035         getchar();
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<a name="l00036"></a>00036         }
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<a name="l00037"></a>00037
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<a name="l00042"></a>00042 <span class="keywordtype">void</span> timestamp(<span class="keywordtype">char</span> *str)
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<a name="l00043"></a>00043     {
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<a name="l00044"></a>00044     time_t t;
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<a name="l00045"></a>00045     time(&amp;t);
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<a name="l00046"></a>00046     printf(<span class="stringliteral">&quot;The time %s is %s\n&quot;</span>, str, ctime(&amp;t));
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<a name="l00047"></a>00047     }
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<a name="l00048"></a>00048
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<a name="l00053"></a>00053 <span class="keywordtype">void</span> SIGCHLD_handler(<span class="keywordtype">int</span> signum)
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<a name="l00054"></a>00054     {
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<a name="l00055"></a>00055     <span class="keywordflow">if</span>(signum == SIGCHLD)
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<a name="l00056"></a>00056         printf(<span class="stringliteral">&quot;Now in SIGCHLD handler function\n&quot;</span>);
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<a name="l00057"></a>00057     }
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<a name="l00058"></a>00058
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<a name="l00063"></a>00063 <span class="keywordtype">void</span> SIGALRM_handler(<span class="keywordtype">int</span> signum)
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<a name="l00064"></a>00064     {
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<a name="l00065"></a>00065     <span class="keywordflow">if</span>(signum == SIGALRM)
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<a name="l00066"></a>00066         printf(<span class="stringliteral">&quot;Now in SIGALRM handler function\n&quot;</span>);
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<a name="l00067"></a>00067     }
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<a name="l00068"></a>00068
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<a name="l00073"></a>00073 <span class="keywordtype">void</span> SIGUSR1_handler(<span class="keywordtype">int</span> signum)
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<a name="l00074"></a>00074     {
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<a name="l00075"></a>00075     <span class="keywordflow">if</span>(signum == SIGUSR1)
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<a name="l00076"></a>00076         printf(<span class="stringliteral">&quot;Now in SIGUSR1 handler function\n&quot;</span>);
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<a name="l00077"></a>00077     }
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<a name="l00078"></a>00078
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<a name="l00083"></a>00083 <span class="keywordtype">void</span> SIGUSR2_handler(<span class="keywordtype">int</span> signum)
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<a name="l00084"></a>00084     {
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<a name="l00085"></a>00085     <span class="keywordflow">if</span>(signum == SIGUSR2)
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<a name="l00086"></a>00086         printf(<span class="stringliteral">&quot;Now in SIGUSR2 handler function\n&quot;</span>);
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<a name="l00087"></a>00087
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<a name="l00088"></a>00088     sigrelse(SIGUSR1);
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<a name="l00089"></a>00089     printf(<span class="stringliteral">&quot;SIGUSR1 got released and hence its handler function will get called\n&quot;</span>);
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<a name="l00090"></a>00090     }
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<a name="l00091"></a>00091
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<a name="l00096"></a>00096 <span class="keywordtype">void</span> SIGPIPE_handler(<span class="keywordtype">int</span> signum)
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<a name="l00097"></a>00097     {
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<a name="l00098"></a>00098     <span class="keywordflow">if</span>(signum == SIGPIPE)
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<a name="l00099"></a>00099         printf(<span class="stringliteral">&quot;In SIGPIPE handler function\n&quot;</span>);
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<a name="l00100"></a>00100     }
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<a name="l00101"></a>00101
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<a name="l00105"></a>00105 <span class="keywordtype">void</span> DisplaySignalOptions()
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<a name="l00106"></a>00106     {
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<a name="l00107"></a>00107     printf(<span class="stringliteral">&quot;\nSignal options:\n&quot;</span>);
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<a name="l00108"></a>00108     printf(<span class="stringliteral">&quot;1) Sending and handling a signal using the default handler\n&quot;</span>);
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<a name="l00109"></a>00109     printf(<span class="stringliteral">&quot;2) Sending and handling a signal using a customized signal handler\n&quot;</span>);
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<a name="l00110"></a>00110     printf(<span class="stringliteral">&quot;3) Ignoring an incoming signal\n&quot;</span>);
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<a name="l00111"></a>00111     printf(<span class="stringliteral">&quot;4) Blocking and releasing a signal\n&quot;</span>);
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<a name="l00112"></a>00112     printf(<span class="stringliteral">&quot;5) Waiting for a signal\n&quot;</span>);
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<a name="l00113"></a>00113     printf(<span class="stringliteral">&quot;6) Generating and handling a SIGPIPE signal\n&quot;</span>);
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<a name="l00114"></a>00114     printf(<span class="stringliteral">&quot;Type the number of the option you wish to run followed by an enter,\n&quot;</span>);
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<a name="l00115"></a>00115     printf(<span class="stringliteral">&quot;or type &#39;e&#39;+Enter to exit the example.\n&quot;</span>);
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<a name="l00116"></a>00116     }
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<a name="l00117"></a>00117
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<a name="l00121"></a>00121 <span class="keywordtype">void</span> CallDefaultHandler()
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<a name="l00122"></a>00122     {
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<a name="l00123"></a>00123     pid_t my_pid;
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<a name="l00124"></a>00124     my_pid = getpid();
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<a name="l00125"></a>00125     printf(<span class="stringliteral">&quot;Raising a SIGCHLD signal\n&quot;</span>);
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diff changeset 
   103
 
<a name="l00126"></a>00126
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diff changeset 
   104
 
<a name="l00127"></a>00127     signal(SIGCHLD, SIG_DFL);
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diff changeset 
   105
 
<a name="l00128"></a>00128
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parents:
diff changeset 
   106
 
<a name="l00129"></a>00129     <span class="comment">//Raising SIGCHLD signal using kill command.</span>
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diff changeset 
   107
 
<a name="l00130"></a>00130     kill(my_pid, SIGCHLD);
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parents:
diff changeset 
   108
 
<a name="l00131"></a>00131
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diff changeset 
   109
 
<a name="l00132"></a>00132     printf(<span class="stringliteral">&quot;Default handler causes SIGCHLD to get ignored\n&quot;</span>);
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   110
 
<a name="l00133"></a>00133     PressKey();
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diff changeset 
   111
 
<a name="l00134"></a>00134
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diff changeset 
   112
 
<a name="l00135"></a>00135     printf(<span class="stringliteral">&quot;\nRaising a SIGALRM signal\nDefault handler of SIGALRM will terminate the existing process.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   113
 
<a name="l00136"></a>00136     printf(<span class="stringliteral">&quot;\nRestart the example to view the other use cases.\n&quot;</span>);
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diff changeset 
   114
 
<a name="l00137"></a>00137     printf(<span class="stringliteral">&quot;Press the enter key to terminate the example.\n&quot;</span>);
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   115
 
<a name="l00138"></a>00138     PressKey();
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diff changeset 
   116
 
<a name="l00139"></a>00139
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diff changeset 
   117
 
<a name="l00140"></a>00140     signal(SIGALRM, SIG_DFL);
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diff changeset 
   118
 
<a name="l00141"></a>00141
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diff changeset 
   119
 
<a name="l00142"></a>00142     <span class="comment">//Raising SIGALRM signal.</span>
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diff changeset 
   120
 
<a name="l00143"></a>00143     kill(my_pid, SIGALRM);
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diff changeset 
   121
 
<a name="l00144"></a>00144     printf(<span class="stringliteral">&quot;After SIGALRM being raised\n&quot;</span>);
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diff changeset 
   122
 
<a name="l00145"></a>00145
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diff changeset 
   123
 
<a name="l00146"></a>00146     printf(gstr);
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   124
 
<a name="l00147"></a>00147     }
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diff changeset 
   125
 
<a name="l00148"></a>00148
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   126
 
<a name="l00152"></a>00152 <span class="keywordtype">void</span> CallSignalHandler()
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   127
 
<a name="l00153"></a>00153     {
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   128
 
<a name="l00154"></a>00154     <span class="keyword">struct </span>sigaction sa1,sa2;
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   129
 
<a name="l00155"></a>00155     sa1.sa_handler = SIGCHLD_handler;
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diff changeset 
   130
 
<a name="l00156"></a>00156     sigemptyset(&amp;sa1.sa_mask);
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parents:
diff changeset 
   131
 
<a name="l00157"></a>00157     sa1.sa_flags = 0;
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diff changeset 
   132
 
<a name="l00158"></a>00158
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parents:
diff changeset 
   133
 
<a name="l00159"></a>00159     sa2.sa_handler = SIGALRM_handler;
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parents:
diff changeset 
   134
 
<a name="l00160"></a>00160     sigemptyset(&amp;sa2.sa_mask);
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parents:
diff changeset 
   135
 
<a name="l00161"></a>00161     sa2.sa_flags = 0;
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parents:
diff changeset 
   136
 
<a name="l00162"></a>00162
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diff changeset 
   137
 
<a name="l00163"></a>00163     <span class="keywordflow">if</span> (sigaction(SIGCHLD, &amp;sa1, NULL) == -1)
43e37759235e Week 12 contribution of example code"
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diff changeset 
   138
 
<a name="l00164"></a>00164         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   139
 
<a name="l00165"></a>00165         printf(<span class="stringliteral">&quot;error in setting the handler for SIGCHLD\n&quot;</span>);
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parents:
diff changeset 
   140
 
<a name="l00166"></a>00166         }
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parents:
diff changeset 
   141
 
<a name="l00167"></a>00167
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parents:
diff changeset 
   142
 
<a name="l00168"></a>00168     <span class="keywordflow">if</span> (sigaction(SIGALRM, &amp;sa2, NULL) == -1)
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parents:
diff changeset 
   143
 
<a name="l00169"></a>00169         {
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parents:
diff changeset 
   144
 
<a name="l00170"></a>00170         printf(<span class="stringliteral">&quot;error in setting the handler for SIGALRM\n&quot;</span>);
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parents:
diff changeset 
   145
 
<a name="l00171"></a>00171         }
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parents:
diff changeset 
   146
 
<a name="l00172"></a>00172
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parents:
diff changeset 
   147
 
<a name="l00173"></a>00173     printf(<span class="stringliteral">&quot;\nRaising a SIGCHLD signal\n&quot;</span>);
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parents:
diff changeset 
   148
 
<a name="l00174"></a>00174     kill(getpid(), SIGCHLD);                 <span class="comment">//Raising SIGCHLD signal using kill command.</span>
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parents:
diff changeset 
   149
 
<a name="l00175"></a>00175     printf(<span class="stringliteral">&quot;SIGCHLD has been handled\n&quot;</span>);
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parents:
diff changeset 
   150
 
<a name="l00176"></a>00176
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parents:
diff changeset 
   151
 
<a name="l00177"></a>00177     printf(<span class="stringliteral">&quot;\nRaising a SIGALRM signal\n&quot;</span>);
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diff changeset 
   152
 
<a name="l00178"></a>00178     kill(getpid(), SIGALRM);                 <span class="comment">//Raising SIGALRM signal using kill command.</span>
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diff changeset 
   153
 
<a name="l00179"></a>00179     printf(<span class="stringliteral">&quot;SIGALRM has been handled\n&quot;</span>);
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parents:
diff changeset 
   154
 
<a name="l00180"></a>00180
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parents:
diff changeset 
   155
 
<a name="l00181"></a>00181     printf(gstr);
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diff changeset 
   156
 
<a name="l00182"></a>00182     }
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parents:
diff changeset 
   157
 
<a name="l00183"></a>00183
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diff changeset 
   158
 
<a name="l00187"></a>00187 <span class="keywordtype">void</span> IgnoreSignal()
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parents:
diff changeset 
   159
 
<a name="l00188"></a>00188     {
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diff changeset 
   160
 
<a name="l00189"></a>00189         <span class="keyword">struct </span>sigaction sa1,sa2;   <span class="comment">//The variables for holding signal specific settings, used in sigaction function call. </span>
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parents:
diff changeset 
   161
 
<a name="l00190"></a>00190         sa1.sa_handler = SIG_IGN;
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parents:
diff changeset 
   162
 
<a name="l00191"></a>00191         sigemptyset(&amp;sa1.sa_mask);
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parents:
diff changeset 
   163
 
<a name="l00192"></a>00192         sa1.sa_flags = 0;
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parents:
diff changeset 
   164
 
<a name="l00193"></a>00193
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   165
 
<a name="l00194"></a>00194         sa2.sa_handler = SIG_IGN;
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parents:
diff changeset 
   166
 
<a name="l00195"></a>00195         sigemptyset(&amp;sa2.sa_mask);
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parents:
diff changeset 
   167
 
<a name="l00196"></a>00196         sa2.sa_flags = 0;
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parents:
diff changeset 
   168
 
<a name="l00197"></a>00197
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parents:
diff changeset 
   169
 
<a name="l00198"></a>00198         <span class="comment">// Set the signal handler for SIGCHLD.</span>
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parents:
diff changeset 
   170
 
<a name="l00199"></a>00199         <span class="keywordflow">if</span> (sigaction(SIGCHLD, &amp;sa1, NULL) == -1)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   171
 
<a name="l00200"></a>00200                    printf(<span class="stringliteral">&quot;sigaction for SIGCHLD failed\n&quot;</span>);
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parents:
diff changeset 
   172
 
<a name="l00201"></a>00201
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parents:
diff changeset 
   173
 
<a name="l00202"></a>00202         <span class="comment">// Set the signal handler for SIGALRM.</span>
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parents:
diff changeset 
   174
 
<a name="l00203"></a>00203         <span class="keywordflow">if</span> (sigaction(SIGALRM, &amp;sa2, NULL) == -1)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   175
 
<a name="l00204"></a>00204                 printf(<span class="stringliteral">&quot;sigaction for SIGALRM failed\n&quot;</span>);
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parents:
diff changeset 
   176
 
<a name="l00205"></a>00205
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   177
 
<a name="l00206"></a>00206         printf(<span class="stringliteral">&quot;\nRaising a SIGCHLD signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   178
 
<a name="l00207"></a>00207         kill(getpid(), SIGCHLD);             <span class="comment">//Raisisng SIGCHLD signal using kill command.</span>
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parents:
diff changeset 
   179
 
<a name="l00208"></a>00208         printf(<span class="stringliteral">&quot;SIGCHLD was ignored\n&quot;</span>);
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parents:
diff changeset 
   180
 
<a name="l00209"></a>00209
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parents:
diff changeset 
   181
 
<a name="l00210"></a>00210         printf(<span class="stringliteral">&quot;\nRaising a SIGALRM signal\n&quot;</span>);
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parents:
diff changeset 
   182
 
<a name="l00211"></a>00211         kill(getpid(), SIGALRM);             <span class="comment">//Raisisng SIGALRM signal using kill command.</span>
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parents:
diff changeset 
   183
 
<a name="l00212"></a>00212         printf(<span class="stringliteral">&quot;SIGALRM was ignored\n&quot;</span>);
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parents:
diff changeset 
   184
 
<a name="l00213"></a>00213
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diff changeset 
   185
 
<a name="l00214"></a>00214         printf(gstr);
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parents:
diff changeset 
   186
 
<a name="l00215"></a>00215     }
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parents:
diff changeset 
   187
 
<a name="l00216"></a>00216
43e37759235e Week 12 contribution of example code"
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diff changeset 
   188
 
<a name="l00220"></a>00220 <span class="keywordtype">void</span> MaskSignal()
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   189
 
<a name="l00221"></a>00221     {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   190
 
<a name="l00222"></a>00222     <span class="comment">// Define a new mask set.</span>
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parents:
diff changeset 
   191
 
<a name="l00223"></a>00223     sigset_t mask_set;
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parents:
diff changeset 
   192
 
<a name="l00224"></a>00224
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   193
 
<a name="l00225"></a>00225     printf(<span class="stringliteral">&quot;* This use case uses SIGUSR1 and SIGUSR2 signals to demonstrate the mask and the release of a signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   194
 
<a name="l00226"></a>00226     printf(<span class="stringliteral">&quot;* We mask the SIGUSR1 signal so that when it is raised it gets blocked and keeps pending until it is\nreleased.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   195
 
<a name="l00227"></a>00227     printf(<span class="stringliteral">&quot;* We then raise the SIGUSR2 signal to release the blocked SIGUSR1 signal.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   196
 
<a name="l00228"></a>00228     printf(<span class="stringliteral">&quot;* The custom handler of the SIGUSR2 signal releases SIGUSR1, and SIGUSR1&#39;s\ncustom handler gets called to handle it.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   197
 
<a name="l00229"></a>00229
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   198
 
<a name="l00230"></a>00230     printf(gnote);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   199
 
<a name="l00231"></a>00231     PressKey();
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parents:
diff changeset 
   200
 
<a name="l00232"></a>00232     PressKey();
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parents:
diff changeset 
   201
 
<a name="l00233"></a>00233
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   202
 
<a name="l00234"></a>00234     <span class="comment">// Set the signal handler for SIGUSR1 and SIGUSR2 signals.</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   203
 
<a name="l00235"></a>00235     signal(SIGUSR1, SIGUSR1_handler);
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parents:
diff changeset 
   204
 
<a name="l00236"></a>00236     signal(SIGUSR2, SIGUSR2_handler);
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parents:
diff changeset 
   205
 
<a name="l00237"></a>00237
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   206
 
<a name="l00238"></a>00238     <span class="comment">// Clearing the mask set so that it doesn&#39;t contain any signal numbers.</span>
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parents:
diff changeset 
   207
 
<a name="l00239"></a>00239     sigemptyset(&amp;mask_set);
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parents:
diff changeset 
   208
 
<a name="l00240"></a>00240     <span class="comment">// Adding SIGUSR1 to the mask set.</span>
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   209
 
<a name="l00241"></a>00241     sigaddset(&amp;mask_set, SIGUSR1);
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   210
 
<a name="l00242"></a>00242     <span class="comment">// Masking the signal.</span>
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diff changeset 
   211
 
<a name="l00243"></a>00243     printf(<span class="stringliteral">&quot;Masking the SIGUSR1 signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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   212
 
<a name="l00244"></a>00244     sigprocmask(SIG_SETMASK, &amp;mask_set, NULL);
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diff changeset 
   213
 
<a name="l00245"></a>00245
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diff changeset 
   214
 
<a name="l00246"></a>00246     printf(<span class="stringliteral">&quot;\nRaising the SIGUSR1 signal&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   215
 
<a name="l00247"></a>00247     printf(gnote);
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diff changeset 
   216
 
<a name="l00248"></a>00248     PressKey();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   217
 
<a name="l00249"></a>00249
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   218
 
<a name="l00250"></a>00250     <span class="keyword">raise</span>(SIGUSR1);
43e37759235e Week 12 contribution of example code"
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   219
 
<a name="l00251"></a>00251     printf(<span class="stringliteral">&quot;SIGUSR1 was ignored as it was masked\n&quot;</span>);
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diff changeset 
   220
 
<a name="l00252"></a>00252
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   221
 
<a name="l00253"></a>00253     printf(<span class="stringliteral">&quot;\nRaising the SIGUSR2 signal&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   222
 
<a name="l00254"></a>00254     printf(gnote);
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diff changeset 
   223
 
<a name="l00255"></a>00255     PressKey();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   224
 
<a name="l00256"></a>00256
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diff changeset 
   225
 
<a name="l00257"></a>00257     <span class="keyword">raise</span>(SIGUSR2);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   226
 
<a name="l00258"></a>00258     printf(<span class="stringliteral">&quot;SIGUSR2 has been handled\n&quot;</span>);
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diff changeset 
   227
 
<a name="l00259"></a>00259
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   228
 
<a name="l00260"></a>00260     printf(gstr);
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   229
 
<a name="l00261"></a>00261     }
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diff changeset 
   230
 
<a name="l00262"></a>00262
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parents:
diff changeset 
   231
 
<a name="l00266"></a>00266 <span class="keywordtype">void</span> WaitForSignal()
43e37759235e Week 12 contribution of example code"
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   232
 
<a name="l00267"></a>00267     {
43e37759235e Week 12 contribution of example code"
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   233
 
<a name="l00268"></a>00268     <span class="keywordtype">int</span> count,result;
43e37759235e Week 12 contribution of example code"
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   234
 
<a name="l00269"></a>00269     <span class="keyword">const</span> <span class="keywordtype">int</span> delay = 2;                <span class="comment">//Time delay of 2 seconds.</span>
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diff changeset 
   235
 
<a name="l00270"></a>00270     sigset_t waitset,outset;            <span class="comment">// Define new mask sets.</span>
43e37759235e Week 12 contribution of example code"
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diff changeset 
   236
 
<a name="l00271"></a>00271     <span class="keyword">struct </span>timespec timeout;            <span class="comment">// A variable for holding timeout values.</span>
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   237
 
<a name="l00272"></a>00272     siginfo_t info;                     <span class="comment">// A variable for holding signal info.</span>
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diff changeset 
   238
 
<a name="l00273"></a>00273
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parents:
diff changeset 
   239
 
<a name="l00274"></a>00274     signal(SIGALRM, SIGALRM_handler);   <span class="comment">// Set the signal handler for SIGALRM.</span>
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diff changeset 
   240
 
<a name="l00275"></a>00275     sigemptyset(&amp;waitset);
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diff changeset 
   241
 
<a name="l00276"></a>00276     sigaddset(&amp;waitset, SIGALRM);       <span class="comment">// Adding SIGALRM to mask set.</span>
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diff changeset 
   242
 
<a name="l00277"></a>00277     sigprocmask(SIG_BLOCK, &amp;waitset, NULL);
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parents:
diff changeset 
   243
 
<a name="l00278"></a>00278
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   244
 
<a name="l00279"></a>00279     printf(<span class="stringliteral">&quot;* This use case demonstrates how a process waits for a SIGALRM signal.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   245
 
<a name="l00280"></a>00280     printf(<span class="stringliteral">&quot;* A fixed timeout period of 5 seconds is set.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   246
 
<a name="l00281"></a>00281     printf(<span class="stringliteral">&quot;* The SIGALRM signal is first blocked and then we wait on it until it is raised.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   247
 
<a name="l00282"></a>00282     printf(<span class="stringliteral">&quot;* The SIGALRM signal is raised twice, once after 6 seconds and another after 4 seconds.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   248
 
<a name="l00283"></a>00283     printf(<span class="stringliteral">&quot;* When SIGALRM is raised after 6 seconds an error is generated as timeout has occurred.\nBut when SIGALRM is raised after 4 seconds the signal is received.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   249
 
<a name="l00284"></a>00284     printf(<span class="stringliteral">&quot;* Even though the SIGALRM signal is received it cannot be handled as it is blocked.\nHence we finally unblock it and handle it.\n&quot;</span>);
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parents:
diff changeset 
   250
 
<a name="l00285"></a>00285
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   251
 
<a name="l00286"></a>00286     printf(gnote);
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parents:
diff changeset 
   252
 
<a name="l00287"></a>00287     PressKey();
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diff changeset 
   253
 
<a name="l00288"></a>00288     PressKey();
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parents:
diff changeset 
   254
 
<a name="l00289"></a>00289
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diff changeset 
   255
 
<a name="l00290"></a>00290     <span class="comment">//Setting the timeout for 5 seconds.</span>
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diff changeset 
   256
 
<a name="l00291"></a>00291     timeout.tv_sec = 5;
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diff changeset 
   257
 
<a name="l00292"></a>00292     timeout.tv_nsec = 500;
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diff changeset 
   258
 
<a name="l00293"></a>00293
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diff changeset 
   259
 
<a name="l00294"></a>00294     <span class="keywordflow">for</span>(count=0;count&lt;2;count++)
43e37759235e Week 12 contribution of example code"
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diff changeset 
   260
 
<a name="l00295"></a>00295         {
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diff changeset 
   261
 
<a name="l00296"></a>00296         <span class="keywordflow">if</span>(count)
43e37759235e Week 12 contribution of example code"
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diff changeset 
   262
 
<a name="l00297"></a>00297             {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   263
 
<a name="l00298"></a>00298             printf(<span class="stringliteral">&quot;Raising SIGALRM after 6 sec\n&quot;</span>);
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diff changeset 
   264
 
<a name="l00299"></a>00299             printf(gnote);
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diff changeset 
   265
 
<a name="l00300"></a>00300             PressKey();
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diff changeset 
   266
 
<a name="l00301"></a>00301             alarm(6);
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diff changeset 
   267
 
<a name="l00302"></a>00302             }
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diff changeset 
   268
 
<a name="l00303"></a>00303         <span class="keywordflow">else</span>
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diff changeset 
   269
 
<a name="l00304"></a>00304             {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   270
 
<a name="l00305"></a>00305             printf(<span class="stringliteral">&quot;Raising SIGALRM after 4 sec\n&quot;</span>);
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diff changeset 
   271
 
<a name="l00306"></a>00306             printf(gnote);
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diff changeset 
   272
 
<a name="l00307"></a>00307             PressKey();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   273
 
<a name="l00308"></a>00308             alarm(4);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   274
 
<a name="l00309"></a>00309             }
43e37759235e Week 12 contribution of example code"
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diff changeset 
   275
 
<a name="l00310"></a>00310         timestamp(<span class="stringliteral">&quot;before sigwait()&quot;</span>);
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diff changeset 
   276
 
<a name="l00311"></a>00311         result = sigtimedwait(&amp;waitset, &amp;info, &amp;timeout);
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diff changeset 
   277
 
<a name="l00312"></a>00312
43e37759235e Week 12 contribution of example code"
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diff changeset 
   278
 
<a name="l00313"></a>00313         <span class="keywordflow">if</span>( result == SIGALRM )
43e37759235e Week 12 contribution of example code"
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diff changeset 
   279
 
<a name="l00314"></a>00314             printf(<span class="stringliteral">&quot;sigwait() returned successful for signal %d\n&quot;</span>, info.si_signo);
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diff changeset 
   280
 
<a name="l00315"></a>00315         <span class="keywordflow">else</span>
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diff changeset 
   281
 
<a name="l00316"></a>00316             {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   282
 
<a name="l00317"></a>00317             printf(<span class="stringliteral">&quot;sigwait() returned an error, since the alarm was generated after the specified time period.error number = %d\n&quot;</span>, errno);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   283
 
<a name="l00318"></a>00318             }
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   284
 
<a name="l00319"></a>00319         timestamp(<span class="stringliteral">&quot;after sigwait()&quot;</span>);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   285
 
<a name="l00320"></a>00320         sleep(delay);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   286
 
<a name="l00321"></a>00321         }
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   287
 
<a name="l00322"></a>00322
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   288
 
<a name="l00323"></a>00323     printf(<span class="stringliteral">&quot;Press Enter to unblock the SIGALRM signal and handle it\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   289
 
<a name="l00324"></a>00324     PressKey();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   290
 
<a name="l00325"></a>00325     sigemptyset(&amp;outset);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   291
 
<a name="l00326"></a>00326     sigprocmask(SIG_UNBLOCK, &amp;waitset, &amp;outset);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   292
 
<a name="l00327"></a>00327
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   293
 
<a name="l00328"></a>00328     printf(gstr);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   294
 
<a name="l00329"></a>00329     }
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parents:
diff changeset 
   295
 
<a name="l00330"></a>00330
43e37759235e Week 12 contribution of example code"
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diff changeset 
   296
 
<a name="l00334"></a>00334 <span class="keywordtype">void</span> HandleSigpipe()
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   297
 
<a name="l00335"></a>00335     {
43e37759235e Week 12 contribution of example code"
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diff changeset 
   298
 
<a name="l00336"></a>00336     <span class="keywordtype">int</span> ret,fds[2];   <span class="comment">// fds, used for holding the read and write descriptors for pipe</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   299
 
<a name="l00337"></a>00337     printf(<span class="stringliteral">&quot;* This use case demonstrates how writing to a broken pipe generates a SIGPIPE signal.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   300
 
<a name="l00338"></a>00338     printf(<span class="stringliteral">&quot;* We first create a pipe and obtain the read and write descriptors.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   301
 
<a name="l00339"></a>00339     printf(<span class="stringliteral">&quot;* To obtain a broken pipe we close the read end of the pipe.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   302
 
<a name="l00340"></a>00340     printf(<span class="stringliteral">&quot;* Once a write is performed to the broken pipe, an EPIPE error is returned\nand hence the SIGPIPE signal is generated.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   303
 
<a name="l00341"></a>00341
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   304
 
<a name="l00342"></a>00342     printf(gnote);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   305
 
<a name="l00343"></a>00343     getchar();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   306
 
<a name="l00344"></a>00344     PressKey();
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   307
 
<a name="l00345"></a>00345
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   308
 
<a name="l00346"></a>00346     <span class="comment">//Set the signal handler for the SIGPIPE signal.</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   309
 
<a name="l00347"></a>00347     signal(SIGPIPE, SIGPIPE_handler);
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parents:
diff changeset 
   310
 
<a name="l00348"></a>00348
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parents:
diff changeset 
   311
 
<a name="l00349"></a>00349     <span class="comment">//Create a pipe.</span>
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parents:
diff changeset 
   312
 
<a name="l00350"></a>00350     ret = pipe(fds);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   313
 
<a name="l00351"></a>00351     <span class="keywordflow">if</span>(ret != 0)
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parents:
diff changeset 
   314
 
<a name="l00352"></a>00352         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   315
 
<a name="l00353"></a>00353         printf(<span class="stringliteral">&quot;Failed to create a pipe and the errno is %d\n&quot;</span>,errno);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   316
 
<a name="l00354"></a>00354         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   317
 
<a name="l00355"></a>00355     <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   318
 
<a name="l00356"></a>00356         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   319
 
<a name="l00357"></a>00357         printf(<span class="stringliteral">&quot;The pipe was created successfully\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   320
 
<a name="l00358"></a>00358         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   321
 
<a name="l00359"></a>00359     <span class="comment">//Close the read end of a pipe.</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   322
 
<a name="l00360"></a>00360     close(fds[0]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   323
 
<a name="l00361"></a>00361
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   324
 
<a name="l00362"></a>00362     <span class="comment">//Write to a pipe whose read end is closed (a broken pipe).</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   325
 
<a name="l00363"></a>00363     printf(<span class="stringliteral">&quot;Writing to a broken pipe\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   326
 
<a name="l00364"></a>00364     ret = write(fds[1], <span class="stringliteral">&quot;sigpipe&quot;</span>, 10);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   327
 
<a name="l00365"></a>00365     <span class="keywordflow">if</span>((ret != -1) &amp;&amp; (errno != EPIPE))
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   328
 
<a name="l00366"></a>00366         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   329
 
<a name="l00367"></a>00367         printf(<span class="stringliteral">&quot;Failed to generate the SIGPIPE signal on pipe\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   330
 
<a name="l00368"></a>00368         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   331
 
<a name="l00369"></a>00369     <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   332
 
<a name="l00370"></a>00370         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   333
 
<a name="l00371"></a>00371         printf(<span class="stringliteral">&quot;Writing to a pipe with the read end closed, has returned EPIPE and hence generated the SIGPIPE signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   334
 
<a name="l00372"></a>00372         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   335
 
<a name="l00373"></a>00373
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   336
 
<a name="l00374"></a>00374     printf(gstr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   337
 
<a name="l00375"></a>00375     }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   338
 
<a name="l00376"></a>00376
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   339
 
<a name="l00381"></a>00381 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   340
 
<a name="l00382"></a>00382         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   341
 
<a name="l00383"></a>00383         <span class="keywordtype">int</span> character;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   342
 
<a name="l00384"></a>00384         <span class="keywordtype">int</span> val = TRUE;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   343
 
<a name="l00385"></a>00385         <span class="comment">//Welcome Note.</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   344
 
<a name="l00386"></a>00386         printf(<span class="stringliteral">&quot;************************************************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   345
 
<a name="l00387"></a>00387         printf(<span class="stringliteral">&quot;*                  Welcome to the Signal Example                       *\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   346
 
<a name="l00388"></a>00388         printf(<span class="stringliteral">&quot;*      This example demonstrates some basic signal use cases           *\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   347
 
<a name="l00389"></a>00389         printf(<span class="stringliteral">&quot;************************************************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   348
 
<a name="l00390"></a>00390         printf(<span class="stringliteral">&quot;Please refer to the overview for a better understanding of this example.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   349
 
<a name="l00391"></a>00391
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   350
 
<a name="l00392"></a>00392         <span class="comment">//Generating menu for various signal functions.</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   351
 
<a name="l00393"></a>00393         DisplaySignalOptions();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   352
 
<a name="l00394"></a>00394         <span class="keywordflow">while</span>(val)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   353
 
<a name="l00395"></a>00395             {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   354
 
<a name="l00396"></a>00396             <span class="keywordflow">while</span>((character = getchar())!= <span class="charliteral">&#39;\n&#39;</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   355
 
<a name="l00397"></a>00397                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   356
 
<a name="l00398"></a>00398                 <span class="keywordflow">switch</span>(character)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   357
 
<a name="l00399"></a>00399                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   358
 
<a name="l00400"></a>00400                 <span class="keywordflow">case</span> <span class="charliteral">&#39;1&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   359
 
<a name="l00401"></a>00401                      printf(<span class="stringliteral">&quot;\nDemonstrating sending and handling of 2 signals by the default handler\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   360
 
<a name="l00402"></a>00402                      printf(<span class="stringliteral">&quot;**********************************************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   361
 
<a name="l00403"></a>00403                      CallDefaultHandler();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   362
 
<a name="l00404"></a>00404                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   363
 
<a name="l00405"></a>00405                 <span class="keywordflow">case</span> <span class="charliteral">&#39;2&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   364
 
<a name="l00406"></a>00406                      printf(<span class="stringliteral">&quot;\nDemonstrating sending and handling of 2 signals using a custom signal handler\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   365
 
<a name="l00407"></a>00407                      printf(<span class="stringliteral">&quot;*****************************************************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   366
 
<a name="l00408"></a>00408                      CallSignalHandler();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   367
 
<a name="l00409"></a>00409                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   368
 
<a name="l00410"></a>00410                 <span class="keywordflow">case</span> <span class="charliteral">&#39;3&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   369
 
<a name="l00411"></a>00411                      printf(<span class="stringliteral">&quot;\nDemonstrating ignoring an incoming signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   370
 
<a name="l00412"></a>00412                      printf(<span class="stringliteral">&quot;*****************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   371
 
<a name="l00413"></a>00413                      IgnoreSignal();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   372
 
<a name="l00414"></a>00414                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   373
 
<a name="l00415"></a>00415                 <span class="keywordflow">case</span> <span class="charliteral">&#39;4&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   374
 
<a name="l00416"></a>00416                      printf(<span class="stringliteral">&quot;\nDemonstrating masking and releasing of a signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   375
 
<a name="l00417"></a>00417                      printf(<span class="stringliteral">&quot;***********************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   376
 
<a name="l00418"></a>00418                      MaskSignal();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   377
 
<a name="l00419"></a>00419                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   378
 
<a name="l00420"></a>00420                 <span class="keywordflow">case</span> <span class="charliteral">&#39;5&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   379
 
<a name="l00421"></a>00421                      printf(<span class="stringliteral">&quot;\nDemonstrating waiting for a signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   380
 
<a name="l00422"></a>00422                      printf(<span class="stringliteral">&quot;**********************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   381
 
<a name="l00423"></a>00423                      WaitForSignal();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   382
 
<a name="l00424"></a>00424                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   383
 
<a name="l00425"></a>00425                 <span class="keywordflow">case</span> <span class="charliteral">&#39;6&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   384
 
<a name="l00426"></a>00426                      printf(<span class="stringliteral">&quot;\nDemonstrating generating and handling a SIGPIPE signal\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   385
 
<a name="l00427"></a>00427                      printf(<span class="stringliteral">&quot;******************************************************\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   386
 
<a name="l00428"></a>00428                      HandleSigpipe();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   387
 
<a name="l00429"></a>00429                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   388
 
<a name="l00430"></a>00430                 <span class="keywordflow">case</span> <span class="charliteral">&#39;7&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   389
 
<a name="l00431"></a>00431                      DisplaySignalOptions();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   390
 
<a name="l00432"></a>00432                      <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   391
 
<a name="l00433"></a>00433                 <span class="keywordflow">case</span> <span class="charliteral">&#39;e&#39;</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   392
 
<a name="l00434"></a>00434                     printf(<span class="stringliteral">&quot;Exiting from the main menu\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   393
 
<a name="l00435"></a>00435                     val = FALSE;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   394
 
<a name="l00436"></a>00436                     <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   395
 
<a name="l00437"></a>00437                 <span class="keywordflow">default</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   396
 
<a name="l00438"></a>00438                     printf(<span class="stringliteral">&quot;You chose a wrong option!!! Select again.\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   397
 
<a name="l00439"></a>00439                     <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   398
 
<a name="l00440"></a>00440                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   399
 
<a name="l00441"></a>00441                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   400
 
<a name="l00442"></a>00442             }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   401
 
<a name="l00443"></a>00443         printf(<span class="stringliteral">&quot;Ok [Press the Enter key to exit]\n&quot;</span>);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   402
 
<a name="l00444"></a>00444         PressKey();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   403
 
<a name="l00445"></a>00445         <span class="keywordflow">return</span> EXIT_SUCCESS;    <span class="comment">//Returns the success code.</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   404
 
<a name="l00446"></a>00446         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   405
 
</pre></div></div>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   406
 
<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   407
 
<a href="http://www.doxygen.org/index.html">
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   408
 
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   409
 
</body>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   410
 
</html>
MCL/sftools/depl/docscontent