Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/sigusr1_8c-source.html
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 11 Mar 2010 15:24:26 +0000
changeset 2 ebc84c812384
parent 1 25a17d01db0c
permissions -rw-r--r--
week 10 bug fix submission: Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>TB10.1 Example Applications: examples/PIPS/posixsignals/asyncSignal/src/sigusr1.c Source File</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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<link href="tabs.css" rel="stylesheet" type="text/css">
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</head><body>
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<!-- Generated by Doxygen 1.5.3 -->
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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 "Eclipse Public License v1.0"</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 "http://www.eclipse.org/legal/epl-v10.html".</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 
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<a name="l00026"></a>00026 <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="l00027"></a>00027 FILE *gfp = NULL;   <span class="comment">// The file descriptor variable holding pointer to asyncFile.txt.</span>
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<a name="l00028"></a>00028 pid_t chldProcsID;  <span class="comment">// The variable for holding the sigusr2 PID.</span>
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<a name="l00029"></a>00029 <span class="keywordtype">int</span> gVal = TRUE;    <span class="comment">// Variable used as a boolean value.</span>
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<a name="l00033"></a>00033 <span class="comment"></span><span class="keywordtype">void</span> SIGUSR1_handler(<span class="keywordtype">int</span> signum)
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<a name="l00034"></a>00034     {
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<a name="l00035"></a>00035     <span class="keywordtype">int</span> ret;
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<a name="l00036"></a>00036     <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="l00037"></a>00037     <span class="keywordflow">if</span> (signum == SIGUSR1)
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<a name="l00038"></a>00038         {
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<a name="l00039"></a>00039         gVal = FALSE;
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<a name="l00040"></a>00040         printf(<span class="stringliteral">"\nReceived the SIGUSR1 signal from the sigusr2 process\n"</span>);
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<a name="l00041"></a>00041         printf(<span class="stringliteral">"Starting to read from the file\n"</span>);
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<a name="l00042"></a>00042         <span class="keywordflow">while</span>((gch = fgetc(gfp))!=<span class="charliteral">'\n'</span>)
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<a name="l00043"></a>00043             {
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<a name="l00044"></a>00044             putchar(gch);  <span class="comment">//Writing to stdout.</span>
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<a name="l00045"></a>00045             }
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<a name="l00046"></a>00046         printf(<span class="stringliteral">"\n"</span>);  
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<a name="l00047"></a>00047         sleep (delay1);     
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<a name="l00048"></a>00048         
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<a name="l00049"></a>00049         <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="l00050"></a>00050         printf(<span class="stringliteral">"Reading from the file now completed, sending SIGUSR2 to the sigusr2 process\n"</span>);
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<a name="l00051"></a>00051         
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<a name="l00052"></a>00052         <span class="comment">//Raising SIGUSR2 signal using kill command.</span>
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<a name="l00053"></a>00053         ret = kill(chldProcsID,SIGUSR2);
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<a name="l00054"></a>00054         <span class="keywordflow">if</span>(ret)
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<a name="l00055"></a>00055             {
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<a name="l00056"></a>00056             printf(<span class="stringliteral">"kill() failed to send signal, errno=%d\n"</span>,errno);
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<a name="l00057"></a>00057             }
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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="l00074"></a>00074 <span class="keywordtype">int</span> main()
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<a name="l00075"></a>00075     {
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<a name="l00076"></a>00076     <span class="keywordtype">int</span> ret;
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<a name="l00077"></a>00077     <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="l00078"></a>00078     <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="l00079"></a>00079     <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="l00080"></a>00080     
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<a name="l00081"></a>00081     <span class="keywordtype">char</span> *filename = <span class="stringliteral">"C:\\asyncFile.txt"</span> ;                      <span class="comment">//Filename of the file that holds names input by the user.</span>
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<a name="l00082"></a>00082     <span class="keywordtype">char</span> *childProcess = <span class="stringliteral">"Z:\\sys\\bin\\sigusr2.exe"</span>;           <span class="comment">//Filename of sigusr2 process.</span>
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<a name="l00083"></a>00083     <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="l00084"></a>00084     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="l00085"></a>00085     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="l00086"></a>00086     argv[2] = NULL;
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<a name="l00087"></a>00087 
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<a name="l00088"></a>00088     
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<a name="l00089"></a>00089     strcpy(argv[0], <span class="stringliteral">"z:\\sys\\bin\\sigusr2.exe"</span>);               <span class="comment">//argv[0] holding name of the sigusr2 process.</span>
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<a name="l00090"></a>00090     sprintf(argv[1],<span class="stringliteral">"%d"</span>,getpid());                             <span class="comment">//argv[1] holding PID of sigusr1 process.</span>
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<a name="l00091"></a>00091     
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<a name="l00092"></a>00092     <span class="comment">//Setup the custom handler for SIGUSR1.</span>
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    84
<a name="l00093"></a>00093     signal(SIGUSR1,SIGUSR1_handler);
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<a name="l00094"></a>00094     
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<a name="l00095"></a>00095     printf(<span class="stringliteral">"*****************************************************************\n"</span>);
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    87
<a name="l00096"></a>00096     printf(<span class="stringliteral">"*   Welcome to the asynchronous signal handling demonstration   *\n"</span>);
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<a name="l00097"></a>00097     printf(<span class="stringliteral">"*****************************************************************\n"</span>);
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    89
<a name="l00098"></a>00098     
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<a name="l00099"></a>00099     printf(<span class="stringliteral">"* This example demonstrates asynchronous signal handling using SIGUSR1 and SIGUSR2 signals.\n"</span>);
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<a name="l00100"></a>00100     printf(<span class="stringliteral">"* The example consists of two processes, the sigusr1 process and the sigusr2 process.\n"</span>);
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<a name="l00101"></a>00101     printf(<span class="stringliteral">"* The sigusr1 process handles the SIGUSR1 signal and sends a SIGUSR2 signal to the sigusr2 process.\n"</span>);
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<a name="l00102"></a>00102     printf(<span class="stringliteral">"* The sigusr2 process handles the SIGUSR2 signal and sends a SIGUSR1 signal to the sigusr1 process.\n"</span>);
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<a name="l00103"></a>00103     printf(<span class="stringliteral">"* The sigusr1 process opens a file and writes some text in it.\n"</span>);
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<a name="l00104"></a>00104     printf(<span class="stringliteral">"* The sigusr1 process then spawns the sigusr2 process and waits until SIGUSR1 is received from it.\n"</span>);
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<a name="l00105"></a>00105     printf(<span class="stringliteral">"* Once the sigusr1 process obtains a SIGUSR1 signal, it starts reading from the file and displays its\ncontent on the console.\n"</span>);
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<a name="l00106"></a>00106     printf(<span class="stringliteral">"* When all the file content is written, the sigusr1 process sends a SIGUSR2 signal to the sigusr2 process and prepares to exit.\n"</span>);
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<a name="l00107"></a>00107     printf(<span class="stringliteral">"* On other side the sigusr2 process keeps waiting for the SIGUSR2 signal from the sigusr1 process.\n"</span>);
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<a name="l00108"></a>00108     printf(<span class="stringliteral">"* On reception of the SIGUSR2 signal, the sigusr2 process prepares to exit.\n"</span>);
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<a name="l00109"></a>00109     
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<a name="l00110"></a>00110     printf(<span class="stringliteral">"\nPress the Enter key to continue\n"</span>);
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<a name="l00111"></a>00111     getchar();
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   103
<a name="l00112"></a>00112     
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<a name="l00113"></a>00113     printf(<span class="stringliteral">"****************** In the sigusr1 process ********************\n"</span>); 
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<a name="l00114"></a>00114   
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<a name="l00115"></a>00115          
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<a name="l00116"></a>00116     printf(<span class="stringliteral">"\nOpening a file for read and write\n"</span>);
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<a name="l00117"></a>00117     <span class="keywordflow">if</span>((gfp = fopen(filename,<span class="stringliteral">"w+"</span>))!=NULL)
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<a name="l00118"></a>00118         {
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<a name="l00119"></a>00119         printf(<span class="stringliteral">"Successfully opened the file\n"</span>);
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<a name="l00120"></a>00120         fprintf(gfp, <span class="stringliteral">"%s"</span>, <span class="stringliteral">"An asynchronous signal handling example using the SIGUSR1 and SIGUSR2 signals\n"</span>);
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<a name="l00121"></a>00121         rewind(gfp);
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<a name="l00122"></a>00122         printf(<span class="stringliteral">"Writing to the file completed, preparing to start reading from the file\n"</span>);
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<a name="l00123"></a>00123         
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<a name="l00124"></a>00124         printf(<span class="stringliteral">"Press the Enter key to spawn the sigusr2 process\n"</span>);
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<a name="l00125"></a>00125         getchar();
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<a name="l00126"></a>00126         
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<a name="l00127"></a>00127         <span class="comment">//Spawning sigusr2 process.</span>
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<a name="l00128"></a>00128         ret = posix_spawn(&amp;chldProcsID,childProcess,NULL,NULL,argv,(<span class="keywordtype">char</span>**)NULL);
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<a name="l00129"></a>00129         <span class="keywordflow">if</span>(ret != 0)     
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<a name="l00130"></a>00130             {         
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<a name="l00131"></a>00131             printf(<span class="stringliteral">"\n*** failure posix_spawn ***\n"</span>);        
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<a name="l00132"></a>00132             <span class="keywordflow">return</span> EXIT_FAILURE;     
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<a name="l00133"></a>00133             }
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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     printf(<span class="stringliteral">"Waiting until SIGUSR1 is obtained from the sigusr2 process"</span>);
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<a name="l00137"></a>00137     <span class="keywordflow">while</span>(gVal)
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<a name="l00138"></a>00138         {
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<a name="l00139"></a>00139         printf(<span class="stringliteral">"."</span>);
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<a name="l00140"></a>00140         sleep(delay);
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<a name="l00141"></a>00141         }
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<a name="l00142"></a>00142     
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<a name="l00143"></a>00143     <span class="keywordflow">if</span>(!fclose(gfp))
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<a name="l00144"></a>00144         {
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<a name="l00145"></a>00145         <span class="keyword">remove</span>(filename);
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<a name="l00146"></a>00146         gfp=NULL;
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<a name="l00147"></a>00147         printf(<span class="stringliteral">"The file was closed successfully.\n"</span>);
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<a name="l00148"></a>00148         }
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<a name="l00149"></a>00149     <span class="keywordflow">else</span>
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<a name="l00150"></a>00150         {
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   142
<a name="l00151"></a>00151         printf(<span class="stringliteral">"File close failed.\n"</span>);
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<a name="l00152"></a>00152         }
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<a name="l00153"></a>00153     
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<a name="l00154"></a>00154     printf(<span class="stringliteral">"Press 'e'+Enter to exit from the sigusr1 process\n"</span>);
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<a name="l00155"></a>00155     
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<a name="l00156"></a>00156     <span class="keywordflow">while</span>((gch=getchar())!= <span class="charliteral">'e'</span>)
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<a name="l00157"></a>00157         {
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<a name="l00158"></a>00158         <span class="keywordflow">if</span>(gch == <span class="charliteral">'\n'</span>)
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<a name="l00159"></a>00159             <span class="keywordflow">continue</span>;
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<a name="l00160"></a>00160         <span class="keywordflow">else</span>
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<a name="l00161"></a>00161             printf(<span class="stringliteral">"The wrong option was selected, please try again!!!\n"</span>);
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<a name="l00162"></a>00162         }
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<a name="l00163"></a>00163     <span class="keywordflow">return</span> EXIT_SUCCESS;
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<a name="l00164"></a>00164     }
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</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:33:00 2010 for TB10.1 Example Applications by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address>
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</body>
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</html>