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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/sigterm_signal_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/sigtermSignal/src/sigtermSignal.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/sigtermSignal/src/sigtermSignal.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// sigtermSignal.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: The source code file for sigtermSignal.</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;string.h&gt;</span>
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<a name="l00020"></a>00020 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
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<a name="l00021"></a>00021 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
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<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;sys/types.h&gt;</span>
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<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;signal.h&gt;</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 <span class="preprocessor">#include &lt;time.h&gt;</span>
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<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;spawn.h&gt;</span>
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<a name="l00027"></a>00027
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<a name="l00028"></a>00028 FILE *gfp = NULL;
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<a name="l00029"></a>00029 <span class="keywordtype">char</span> *testfile = <span class="stringliteral">&quot;C:\\testfile.txt&quot;</span>;
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<a name="l00030"></a>00030
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<a name="l00034"></a>00034 <span class="keywordtype">void</span> PressKey()
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<a name="l00035"></a>00035     {
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<a name="l00036"></a>00036     <span class="keywordtype">int</span> ch;
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<a name="l00037"></a>00037     printf(<span class="stringliteral">&quot;Press &#39;e&#39;+Enter to exit\n&quot;</span>);
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<a name="l00038"></a>00038     <span class="keywordflow">while</span>((ch=getchar())!= <span class="charliteral">&#39;e&#39;</span>)
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<a name="l00039"></a>00039         {
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<a name="l00040"></a>00040         <span class="keywordflow">if</span>(ch == <span class="charliteral">&#39;\n&#39;</span>)
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<a name="l00041"></a>00041             <span class="keywordflow">continue</span>;
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<a name="l00042"></a>00042         <span class="keywordflow">else</span>
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<a name="l00043"></a>00043             printf(<span class="stringliteral">&quot;wrong option selected, please try again!!!\n&quot;</span>);
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<a name="l00044"></a>00044         }
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<a name="l00045"></a>00045     }
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<a name="l00052"></a>00052 <span class="keywordtype">void</span> SIGTERM_handler(<span class="keywordtype">int</span> signum)
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<a name="l00053"></a>00053     {
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<a name="l00054"></a>00054     <span class="keywordflow">if</span>(signum == SIGTERM)
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<a name="l00055"></a>00055         {
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<a name="l00056"></a>00056         <span class="keywordflow">if</span>(gfp != NULL)
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<a name="l00057"></a>00057             {
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<a name="l00058"></a>00058             printf(<span class="stringliteral">&quot;Received the SIGTERM signal from the raiseSignal process\n&quot;</span>);
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<a name="l00059"></a>00059             fclose(gfp);
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<a name="l00060"></a>00060             <span class="keyword">remove</span>(testfile);
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<a name="l00061"></a>00061             gfp = NULL;
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<a name="l00062"></a>00062             printf(<span class="stringliteral">&quot;The open file descriptor was closed\n&quot;</span>);
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<a name="l00063"></a>00063             PressKey();
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<a name="l00064"></a>00064             exit (0);
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<a name="l00065"></a>00065             }
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<a name="l00066"></a>00066         }
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<a name="l00067"></a>00067     }
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<a name="l00068"></a>00068
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<a name="l00078"></a>00078 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
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<a name="l00079"></a>00079     {
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<a name="l00080"></a>00080     <span class="keywordtype">char</span> input[11];
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<a name="l00081"></a>00081     <span class="keywordtype">int</span> count = 0,num;
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<a name="l00082"></a>00082     <span class="keywordtype">int</span> ch,ret;
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<a name="l00083"></a>00083     pid_t usrProcsID;
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<a name="l00084"></a>00084     <span class="keyword">const</span> <span class="keywordtype">int</span> delay = 4;                                    <span class="comment">//Time delay of 4 sec provided.</span>
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<a name="l00085"></a>00085     <span class="keyword">const</span> <span class="keywordtype">int</span> size = 50;                                    <span class="comment">//No.of characters allowed in the filename.</span>
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<a name="l00086"></a>00086     <span class="keyword">const</span> <span class="keywordtype">int</span> index = 3;                                    <span class="comment">//No.of elements in the array.</span>
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<a name="l00087"></a>00087
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<a name="l00088"></a>00088     <span class="keywordtype">char</span> *usrProcess = <span class="stringliteral">&quot;Z:\\sys\\bin\\raisesignal.exe&quot;</span>;    <span class="comment">//Filename of process used for raising SIGTERM signal.</span>
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<a name="l00089"></a>00089     <span class="keywordtype">char</span> **argv = (<span class="keywordtype">char</span>**)malloc(index*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>*));      <span class="comment">//Variable holding values to be passed on to the raiseSignal process. </span>
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<a name="l00090"></a>00090     argv[0] = (<span class="keywordtype">char</span>*)malloc(size*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
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<a name="l00091"></a>00091     argv[1] = (<span class="keywordtype">char</span>*)malloc(index*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
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<a name="l00092"></a>00092     argv[2] = NULL;
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<a name="l00093"></a>00093
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095     strcpy(argv[0], <span class="stringliteral">&quot;z:\\sys\\bin\\raisesignal.exe&quot;</span>);       <span class="comment">//argv[0] holding name of the child process.</span>
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<a name="l00096"></a>00096     sprintf(argv[1],<span class="stringliteral">&quot;%d&quot;</span>,getpid());                         <span class="comment">//argv[1] holding parent pid.</span>
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098     printf(<span class="stringliteral">&quot;*****************************************************************************************\n&quot;</span>);
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<a name="l00099"></a>00099     printf(<span class="stringliteral">&quot;* Welcome to the demonstration of a graceful process termination using a SIGTERM signal *\n&quot;</span>);
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<a name="l00100"></a>00100     printf(<span class="stringliteral">&quot;*****************************************************************************************\n&quot;</span>);
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<a name="l00101"></a>00101
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<a name="l00102"></a>00102     printf(<span class="stringliteral">&quot;* This example shows how a SIGTERM signal can be used to gracefully terminate a process.\n&quot;</span>);
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<a name="l00103"></a>00103     printf(<span class="stringliteral">&quot;* The example first creates a process called sigtermSignal, assigns a custom handler\nfor the SIGTERM signal, opens a file and gets names from the user to be written in to it.\n&quot;</span>);
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<a name="l00104"></a>00104     printf(<span class="stringliteral">&quot;* It then simultaneously spawns a raiseSignal process and starts reading from the file.\n&quot;</span>);
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<a name="l00105"></a>00105     printf(<span class="stringliteral">&quot;* The raiseSignal process sends a SIGTERM signal to the sigtermSignal process.\n&quot;</span>);
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<a name="l00106"></a>00106     printf(<span class="stringliteral">&quot;* On receiving the SIGTERM signal, the sigtermSignal process closes all the \nopen file descriptors and prepares to exit.\n&quot;</span>);
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    99
 
<a name="l00107"></a>00107
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   100
 
<a name="l00108"></a>00108     printf(<span class="stringliteral">&quot;\nPress the Enter key to continue\n&quot;</span>);
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   101
 
<a name="l00109"></a>00109     getchar();
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<a name="l00110"></a>00110
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   103
 
<a name="l00111"></a>00111     signal(SIGTERM, SIGTERM_handler);
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   104
 
<a name="l00112"></a>00112     printf(<span class="stringliteral">&quot;************ In the sigtermSignal process ************\n&quot;</span>);
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<a name="l00113"></a>00113     printf(<span class="stringliteral">&quot;Enter the number of names you want to enter (e.g. 8) :\n&quot;</span>);
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<a name="l00114"></a>00114     scanf(<span class="stringliteral">&quot;%d&quot;</span>, &amp;count);
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<a name="l00115"></a>00115     gfp=fopen(testfile, <span class="stringliteral">&quot;w+&quot;</span>);   <span class="comment">//Opening the file for read and write.</span>
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<a name="l00116"></a>00116     <span class="keywordflow">if</span>(gfp != NULL)
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<a name="l00117"></a>00117         {
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<a name="l00118"></a>00118         printf(<span class="stringliteral">&quot;File open sucessful\n&quot;</span>);
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<a name="l00119"></a>00119         }
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<a name="l00120"></a>00120     <span class="keywordflow">else</span>
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<a name="l00121"></a>00121         {
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<a name="l00122"></a>00122         printf(<span class="stringliteral">&quot;File open failed\n&quot;</span>);
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<a name="l00123"></a>00123         }
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<a name="l00124"></a>00124     <span class="keywordflow">for</span>(num=1; num&lt;=count; num++)
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<a name="l00125"></a>00125         {
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<a name="l00126"></a>00126         printf(<span class="stringliteral">&quot;Name (%d)=&quot;</span>, num);
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<a name="l00127"></a>00127         scanf(<span class="stringliteral">&quot;%s&quot;</span>, input);
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<a name="l00128"></a>00128         fprintf(gfp, <span class="stringliteral">&quot;%s\n&quot;</span>, input);
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<a name="l00129"></a>00129         }
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<a name="l00130"></a>00130
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<a name="l00131"></a>00131     printf(<span class="stringliteral">&quot;Press the Enter key to spawn the raiseSignal process\n&quot;</span>);
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<a name="l00132"></a>00132     getchar();
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<a name="l00133"></a>00133     getchar();
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<a name="l00134"></a>00134     <span class="comment">//Spawning raiseSignal process to accept user input.</span>
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<a name="l00135"></a>00135     ret = posix_spawn(&amp;usrProcsID,usrProcess,NULL,NULL,argv,(<span class="keywordtype">char</span>**)NULL);
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<a name="l00136"></a>00136     <span class="keywordflow">if</span>(ret != 0)
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   129
 
<a name="l00137"></a>00137         {
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<a name="l00138"></a>00138         printf(<span class="stringliteral">&quot;\n*** failure posix_spawn ***\n&quot;</span>);
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<a name="l00139"></a>00139         <span class="keywordflow">return</span> EXIT_FAILURE;
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<a name="l00140"></a>00140         }
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   133
 
<a name="l00141"></a>00141      rewind(gfp);
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   134
 
<a name="l00142"></a>00142      printf(<span class="stringliteral">&quot;Starting to read from the file\n&quot;</span>);
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<a name="l00143"></a>00143      <span class="keywordflow">for</span>(num=1; num&lt;=count; num++)
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   136
 
<a name="l00144"></a>00144          {
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<a name="l00145"></a>00145          sleep (delay);
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   138
 
<a name="l00146"></a>00146          printf(<span class="stringliteral">&quot;Name (%d)=&quot;</span>, num);
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   139
 
<a name="l00147"></a>00147          <span class="keywordflow">while</span>((ch=(fgetc(gfp))) != <span class="charliteral">&#39;\n&#39;</span>)
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<a name="l00148"></a>00148                   {
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   141
 
<a name="l00149"></a>00149                   putchar(ch);
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<a name="l00150"></a>00150                   }
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   143
 
<a name="l00151"></a>00151          printf(<span class="stringliteral">&quot;\n&quot;</span>);
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<a name="l00152"></a>00152
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<a name="l00153"></a>00153          }
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   146
 
<a name="l00154"></a>00154     <span class="keywordflow">if</span>(!fclose(gfp))
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<a name="l00155"></a>00155         {
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   148
 
<a name="l00156"></a>00156         <span class="keyword">remove</span>(testfile);
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   149
 
<a name="l00157"></a>00157         gfp = NULL;
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   150
 
<a name="l00158"></a>00158         printf(<span class="stringliteral">&quot;File closed successfully\n&quot;</span>);
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<a name="l00159"></a>00159         }
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<a name="l00160"></a>00160     <span class="keywordflow">else</span>
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   153
 
<a name="l00161"></a>00161         {
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   154
 
<a name="l00162"></a>00162         printf(<span class="stringliteral">&quot;File close failed\n&quot;</span>);
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<a name="l00163"></a>00163         }
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<a name="l00164"></a>00164
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<a name="l00165"></a>00165     PressKey();
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<a name="l00166"></a>00166     <span class="keywordflow">return</span> EXIT_SUCCESS;
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<a name="l00167"></a>00167     }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
MCL/sftools/depl/docscontent