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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/sigusr1_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/asyncSignal/src/sigusr1.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/asyncSignal/src/sigusr1.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// sigusr1.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 asynchronous signal handling.</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
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<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;stdio.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;signal.h&gt;</span> <span class="comment">//The header for signal functionality.</span>
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<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;unistd.h&gt;</span> <span class="comment">//The header used for getpid().</span>
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<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;e32def.h&gt;</span>
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<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;spawn.h&gt;</span>
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<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;string.h&gt;</span>
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<a name="l00026"></a>00026
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<a name="l00027"></a>00027 <span class="keywordtype">int</span> gch;            <span class="comment">// The variable holding a character value, input by the user.</span>
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<a name="l00028"></a>00028 FILE *gfp = NULL;   <span class="comment">// The file descriptor variable holding pointer to asyncFile.txt.</span>
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<a name="l00029"></a>00029 pid_t chldProcsID;  <span class="comment">// The variable for holding the sigusr2 PID.</span>
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<a name="l00030"></a>00030 <span class="keywordtype">int</span> gVal = TRUE;    <span class="comment">// Variable used as a boolean value.</span>
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<a name="l00034"></a>00034 <span class="comment"></span><span class="keywordtype">void</span> SIGUSR1_handler(<span class="keywordtype">int</span> signum)
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<a name="l00035"></a>00035     {
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<a name="l00036"></a>00036     <span class="keywordtype">int</span> ret;
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<a name="l00037"></a>00037     <span class="keyword">const</span> <span class="keywordtype">int</span> delay1 = 1;  <span class="comment">//Time delay of 1 sec.</span>
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<a name="l00038"></a>00038     <span class="keywordflow">if</span> (signum == SIGUSR1)
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<a name="l00039"></a>00039         {
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<a name="l00040"></a>00040         gVal = FALSE;
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<a name="l00041"></a>00041         printf(<span class="stringliteral">&quot;\nReceived the SIGUSR1 signal from the sigusr2 process\n&quot;</span>);
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<a name="l00042"></a>00042         printf(<span class="stringliteral">&quot;Starting to read from the file\n&quot;</span>);
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<a name="l00043"></a>00043         <span class="keywordflow">while</span>((gch = fgetc(gfp))!=<span class="charliteral">&#39;\n&#39;</span>)
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<a name="l00044"></a>00044             {
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<a name="l00045"></a>00045             putchar(gch);  <span class="comment">//Writing to stdout.</span>
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<a name="l00046"></a>00046             }
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<a name="l00047"></a>00047         printf(<span class="stringliteral">&quot;\n&quot;</span>);
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<a name="l00048"></a>00048         sleep (delay1);
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<a name="l00049"></a>00049
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<a name="l00050"></a>00050         <span class="comment">//Sending SIGUSR2 signal to sigusr2 process once the file content is written to the console.</span>
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<a name="l00051"></a>00051         printf(<span class="stringliteral">&quot;Reading from the file now completed, sending SIGUSR2 to the sigusr2 process\n&quot;</span>);
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<a name="l00052"></a>00052
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<a name="l00053"></a>00053         <span class="comment">//Raising SIGUSR2 signal using kill command.</span>
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<a name="l00054"></a>00054         ret = kill(chldProcsID,SIGUSR2);
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<a name="l00055"></a>00055         <span class="keywordflow">if</span>(ret)
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<a name="l00056"></a>00056             {
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<a name="l00057"></a>00057             printf(<span class="stringliteral">&quot;kill() failed to send signal, errno=%d\n&quot;</span>,errno);
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<a name="l00058"></a>00058             }
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<a name="l00059"></a>00059         }
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<a name="l00060"></a>00060     }
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<a name="l00061"></a>00061
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<a name="l00075"></a>00075 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
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<a name="l00076"></a>00076     {
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<a name="l00077"></a>00077     <span class="keywordtype">int</span> ret;
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<a name="l00078"></a>00078     <span class="keyword">const</span> <span class="keywordtype">int</span> delay = 1;                                        <span class="comment">//Delay of 1 sec provided to wait for signal.</span>
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<a name="l00079"></a>00079     <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="l00080"></a>00080     <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="l00081"></a>00081
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<a name="l00082"></a>00082     <span class="keywordtype">char</span> *filename = <span class="stringliteral">&quot;C:\\asyncFile.txt&quot;</span> ;                      <span class="comment">//Filename of the file that holds names input by the user.</span>
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<a name="l00083"></a>00083     <span class="keywordtype">char</span> *childProcess = <span class="stringliteral">&quot;Z:\\sys\\bin\\sigusr2.exe&quot;</span>;           <span class="comment">//Filename of sigusr2 process.</span>
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<a name="l00084"></a>00084     <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 to the sigusr2 process.</span>
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<a name="l00085"></a>00085     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="l00086"></a>00086     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="l00087"></a>00087     argv[2] = NULL;
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<a name="l00088"></a>00088
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090     strcpy(argv[0], <span class="stringliteral">&quot;z:\\sys\\bin\\sigusr2.exe&quot;</span>);               <span class="comment">//argv[0] holding name of the sigusr2 process.</span>
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<a name="l00091"></a>00091     sprintf(argv[1],<span class="stringliteral">&quot;%d&quot;</span>,getpid());                             <span class="comment">//argv[1] holding PID of sigusr1 process.</span>
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<a name="l00092"></a>00092
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<a name="l00093"></a>00093     <span class="comment">//Setup the custom handler for SIGUSR1.</span>
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<a name="l00094"></a>00094     signal(SIGUSR1,SIGUSR1_handler);
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096     printf(<span class="stringliteral">&quot;*****************************************************************\n&quot;</span>);
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<a name="l00097"></a>00097     printf(<span class="stringliteral">&quot;*   Welcome to the asynchronous signal handling demonstration   *\n&quot;</span>);
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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
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<a name="l00100"></a>00100     printf(<span class="stringliteral">&quot;* This example demonstrates asynchronous signal handling using SIGUSR1 and SIGUSR2 signals.\n&quot;</span>);
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<a name="l00101"></a>00101     printf(<span class="stringliteral">&quot;* The example consists of two processes, the sigusr1 process and the sigusr2 process.\n&quot;</span>);
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<a name="l00102"></a>00102     printf(<span class="stringliteral">&quot;* The sigusr1 process handles the SIGUSR1 signal and sends a SIGUSR2 signal to the sigusr2 process.\n&quot;</span>);
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<a name="l00103"></a>00103     printf(<span class="stringliteral">&quot;* The sigusr2 process handles the SIGUSR2 signal and sends a SIGUSR1 signal to the sigusr1 process.\n&quot;</span>);
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    98
 
<a name="l00104"></a>00104     printf(<span class="stringliteral">&quot;* The sigusr1 process opens a file and writes some text in it.\n&quot;</span>);
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    99
 
<a name="l00105"></a>00105     printf(<span class="stringliteral">&quot;* The sigusr1 process then spawns the sigusr2 process and waits until SIGUSR1 is received from it.\n&quot;</span>);
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   100
 
<a name="l00106"></a>00106     printf(<span class="stringliteral">&quot;* Once the sigusr1 process obtains a SIGUSR1 signal, it starts reading from the file and displays its\ncontent on the console.\n&quot;</span>);
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   101
 
<a name="l00107"></a>00107     printf(<span class="stringliteral">&quot;* When all the file content is written, the sigusr1 process sends a SIGUSR2 signal to the sigusr2 process and prepares to exit.\n&quot;</span>);
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   102
 
<a name="l00108"></a>00108     printf(<span class="stringliteral">&quot;* On other side the sigusr2 process keeps waiting for the SIGUSR2 signal from the sigusr1 process.\n&quot;</span>);
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   103
 
<a name="l00109"></a>00109     printf(<span class="stringliteral">&quot;* On reception of the SIGUSR2 signal, the sigusr2 process prepares to exit.\n&quot;</span>);
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   104
 
<a name="l00110"></a>00110
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   105
 
<a name="l00111"></a>00111     printf(<span class="stringliteral">&quot;\nPress the Enter key to continue\n&quot;</span>);
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   106
 
<a name="l00112"></a>00112     getchar();
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<a name="l00113"></a>00113
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<a name="l00114"></a>00114     printf(<span class="stringliteral">&quot;****************** In the sigusr1 process ********************\n&quot;</span>);
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<a name="l00115"></a>00115
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   110
 
<a name="l00116"></a>00116
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   111
 
<a name="l00117"></a>00117     printf(<span class="stringliteral">&quot;\nOpening a file for read and write\n&quot;</span>);
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<a name="l00118"></a>00118     <span class="keywordflow">if</span>((gfp = fopen(filename,<span class="stringliteral">&quot;w+&quot;</span>))!=NULL)
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<a name="l00119"></a>00119         {
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   114
 
<a name="l00120"></a>00120         printf(<span class="stringliteral">&quot;Successfully opened the file\n&quot;</span>);
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   115
 
<a name="l00121"></a>00121         fprintf(gfp, <span class="stringliteral">&quot;%s&quot;</span>, <span class="stringliteral">&quot;An asynchronous signal handling example using the SIGUSR1 and SIGUSR2 signals\n&quot;</span>);
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<a name="l00122"></a>00122         rewind(gfp);
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<a name="l00123"></a>00123         printf(<span class="stringliteral">&quot;Writing to the file completed, preparing to start reading from the file\n&quot;</span>);
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   118
 
<a name="l00124"></a>00124
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<a name="l00125"></a>00125         printf(<span class="stringliteral">&quot;Press the Enter key to spawn the sigusr2 process\n&quot;</span>);
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<a name="l00126"></a>00126         getchar();
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   121
 
<a name="l00127"></a>00127
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<a name="l00128"></a>00128         <span class="comment">//Spawning sigusr2 process.</span>
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<a name="l00129"></a>00129         ret = posix_spawn(&amp;chldProcsID,childProcess,NULL,NULL,argv,(<span class="keywordtype">char</span>**)NULL);
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<a name="l00130"></a>00130         <span class="keywordflow">if</span>(ret != 0)
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<a name="l00131"></a>00131             {
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<a name="l00132"></a>00132             printf(<span class="stringliteral">&quot;\n*** failure posix_spawn ***\n&quot;</span>);
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<a name="l00133"></a>00133             <span class="keywordflow">return</span> EXIT_FAILURE;
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<a name="l00134"></a>00134             }
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<a name="l00135"></a>00135         }
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<a name="l00136"></a>00136
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<a name="l00137"></a>00137     printf(<span class="stringliteral">&quot;Waiting until SIGUSR1 is obtained from the sigusr2 process&quot;</span>);
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<a name="l00138"></a>00138     <span class="keywordflow">while</span>(gVal)
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<a name="l00139"></a>00139         {
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   134
 
<a name="l00140"></a>00140         printf(<span class="stringliteral">&quot;.&quot;</span>);
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<a name="l00141"></a>00141         sleep(delay);
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<a name="l00142"></a>00142         }
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   137
 
<a name="l00143"></a>00143
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   138
 
<a name="l00144"></a>00144     <span class="keywordflow">if</span>(!fclose(gfp))
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<a name="l00145"></a>00145         {
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   140
 
<a name="l00146"></a>00146         <span class="keyword">remove</span>(filename);
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   141
 
<a name="l00147"></a>00147         gfp=NULL;
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   142
 
<a name="l00148"></a>00148         printf(<span class="stringliteral">&quot;The file was closed successfully.\n&quot;</span>);
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   143
 
<a name="l00149"></a>00149         }
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<a name="l00150"></a>00150     <span class="keywordflow">else</span>
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   145
 
<a name="l00151"></a>00151         {
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   146
 
<a name="l00152"></a>00152         printf(<span class="stringliteral">&quot;File close failed.\n&quot;</span>);
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<a name="l00153"></a>00153         }
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   148
 
<a name="l00154"></a>00154
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   149
 
<a name="l00155"></a>00155     printf(<span class="stringliteral">&quot;Press &#39;e&#39;+Enter to exit from the sigusr1 process\n&quot;</span>);
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   150
 
<a name="l00156"></a>00156
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   151
 
<a name="l00157"></a>00157     <span class="keywordflow">while</span>((gch=getchar())!= <span class="charliteral">&#39;e&#39;</span>)
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   152
 
<a name="l00158"></a>00158         {
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   153
 
<a name="l00159"></a>00159         <span class="keywordflow">if</span>(gch == <span class="charliteral">&#39;\n&#39;</span>)
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   154
 
<a name="l00160"></a>00160             <span class="keywordflow">continue</span>;
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<a name="l00161"></a>00161         <span class="keywordflow">else</span>
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<a name="l00162"></a>00162             printf(<span class="stringliteral">&quot;The wrong option was selected, please try again!!!\n&quot;</span>);
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<a name="l00163"></a>00163         }
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<a name="l00164"></a>00164     <span class="keywordflow">return</span> EXIT_SUCCESS;
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<a name="l00165"></a>00165     }
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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