Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/sigterm_signal_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/sigtermSignal/src/sigtermSignal.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/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 "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: 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;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>
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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;time.h&gt;</span>
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<a name="l00025"></a>00025 
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<a name="l00026"></a>00026 
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<a name="l00027"></a>00027 FILE *gfp = NULL;
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<a name="l00028"></a>00028 <span class="keywordtype">char</span> *testfile = <span class="stringliteral">"C:\\testfile.txt"</span>;
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<a name="l00029"></a>00029 
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<a name="l00033"></a>00033 <span class="keywordtype">void</span> PressKey()
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<a name="l00034"></a>00034     {
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<a name="l00035"></a>00035     <span class="keywordtype">int</span> ch;
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<a name="l00036"></a>00036     printf(<span class="stringliteral">"Press 'e'+Enter to exit\n"</span>);
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<a name="l00037"></a>00037     <span class="keywordflow">while</span>((ch=getchar())!= <span class="charliteral">'e'</span>)
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<a name="l00038"></a>00038         {
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<a name="l00039"></a>00039         <span class="keywordflow">if</span>(ch == <span class="charliteral">'\n'</span>)
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<a name="l00040"></a>00040             <span class="keywordflow">continue</span>;
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<a name="l00041"></a>00041         <span class="keywordflow">else</span>
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<a name="l00042"></a>00042             printf(<span class="stringliteral">"wrong option selected, please try again!!!\n"</span>);
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<a name="l00043"></a>00043         }
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<a name="l00044"></a>00044     }
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<a name="l00051"></a>00051 <span class="keywordtype">void</span> SIGTERM_handler(<span class="keywordtype">int</span> signum)
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<a name="l00052"></a>00052     {
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<a name="l00053"></a>00053     <span class="keywordflow">if</span>(signum == SIGTERM)
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<a name="l00054"></a>00054         {
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<a name="l00055"></a>00055         <span class="keywordflow">if</span>(gfp != NULL)
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<a name="l00056"></a>00056             {
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<a name="l00057"></a>00057             printf(<span class="stringliteral">"Received the SIGTERM signal from the raiseSignal process\n"</span>);
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<a name="l00058"></a>00058             fclose(gfp);
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<a name="l00059"></a>00059             <span class="keyword">remove</span>(testfile);
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<a name="l00060"></a>00060             gfp = NULL;
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<a name="l00061"></a>00061             printf(<span class="stringliteral">"The open file descriptor was closed\n"</span>);
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<a name="l00062"></a>00062             PressKey();
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<a name="l00063"></a>00063             exit (0);
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<a name="l00064"></a>00064             }
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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="l00077"></a>00077 <span class="keywordtype">int</span> main()
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<a name="l00078"></a>00078     {
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<a name="l00079"></a>00079     <span class="keywordtype">char</span> input[11];   
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<a name="l00080"></a>00080     <span class="keywordtype">int</span> count = 0,num;
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<a name="l00081"></a>00081     <span class="keywordtype">int</span> ch,ret;
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<a name="l00082"></a>00082     pid_t usrProcsID;
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<a name="l00083"></a>00083     <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="l00084"></a>00084     <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="l00085"></a>00085     <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="l00086"></a>00086     
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<a name="l00087"></a>00087     <span class="keywordtype">char</span> *usrProcess = <span class="stringliteral">"Z:\\sys\\bin\\raisesignal.exe"</span>;    <span class="comment">//Filename of process used for raising SIGTERM signal.</span>
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<a name="l00088"></a>00088     <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="l00089"></a>00089     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="l00090"></a>00090     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="l00091"></a>00091     argv[2] = NULL;
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<a name="l00092"></a>00092 
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<a name="l00093"></a>00093     
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<a name="l00094"></a>00094     strcpy(argv[0], <span class="stringliteral">"z:\\sys\\bin\\raisesignal.exe"</span>);       <span class="comment">//argv[0] holding name of the child process.</span>
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<a name="l00095"></a>00095     sprintf(argv[1],<span class="stringliteral">"%d"</span>,getpid());                         <span class="comment">//argv[1] holding parent pid.</span>
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<a name="l00096"></a>00096 
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<a name="l00097"></a>00097     printf(<span class="stringliteral">"*****************************************************************************************\n"</span>);
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<a name="l00098"></a>00098     printf(<span class="stringliteral">"* Welcome to the demonstration of a graceful process termination using a SIGTERM signal *\n"</span>);
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<a name="l00099"></a>00099     printf(<span class="stringliteral">"*****************************************************************************************\n"</span>);
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<a name="l00100"></a>00100     
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<a name="l00101"></a>00101     printf(<span class="stringliteral">"* This example shows how a SIGTERM signal can be used to gracefully terminate a process.\n"</span>);
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<a name="l00102"></a>00102     printf(<span class="stringliteral">"* 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"</span>);
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<a name="l00103"></a>00103     printf(<span class="stringliteral">"* It then simultaneously spawns a raiseSignal process and starts reading from the file.\n"</span>);
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<a name="l00104"></a>00104     printf(<span class="stringliteral">"* The raiseSignal process sends a SIGTERM signal to the sigtermSignal process.\n"</span>);
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<a name="l00105"></a>00105     printf(<span class="stringliteral">"* On receiving the SIGTERM signal, the sigtermSignal process closes all the \nopen file descriptors and prepares to exit.\n"</span>);
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<a name="l00106"></a>00106     
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<a name="l00107"></a>00107     printf(<span class="stringliteral">"\nPress the Enter key to continue\n"</span>);
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<a name="l00108"></a>00108     getchar();
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<a name="l00109"></a>00109 
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<a name="l00110"></a>00110     signal(SIGTERM, SIGTERM_handler);
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<a name="l00111"></a>00111     printf(<span class="stringliteral">"************ In the sigtermSignal process ************\n"</span>);
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<a name="l00112"></a>00112     printf(<span class="stringliteral">"Enter the number of names you want to enter (e.g. 8) :\n"</span>);
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<a name="l00113"></a>00113     scanf(<span class="stringliteral">"%d"</span>, &amp;count);
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<a name="l00114"></a>00114     gfp=fopen(testfile, <span class="stringliteral">"w+"</span>);   <span class="comment">//Opening the file for read and write.</span>
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<a name="l00115"></a>00115     <span class="keywordflow">if</span>(gfp != NULL)
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<a name="l00116"></a>00116         {
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<a name="l00117"></a>00117         printf(<span class="stringliteral">"File open sucessful\n"</span>);
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<a name="l00118"></a>00118         }
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<a name="l00119"></a>00119     <span class="keywordflow">else</span>
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<a name="l00120"></a>00120         {
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<a name="l00121"></a>00121         printf(<span class="stringliteral">"File open failed\n"</span>);
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<a name="l00122"></a>00122         }
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<a name="l00123"></a>00123     <span class="keywordflow">for</span>(num=1; num&lt;=count; num++)
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<a name="l00124"></a>00124         {
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<a name="l00125"></a>00125         printf(<span class="stringliteral">"Name (%d)="</span>, num);
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<a name="l00126"></a>00126         scanf(<span class="stringliteral">"%s"</span>, input);
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<a name="l00127"></a>00127         fprintf(gfp, <span class="stringliteral">"%s\n"</span>, input);
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<a name="l00128"></a>00128         }
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<a name="l00129"></a>00129     
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<a name="l00130"></a>00130     printf(<span class="stringliteral">"Press the Enter key to spawn the raiseSignal process\n"</span>);
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<a name="l00131"></a>00131     getchar();
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<a name="l00132"></a>00132     getchar();
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<a name="l00133"></a>00133     <span class="comment">//Spawning raiseSignal process to accept user input.</span>
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<a name="l00134"></a>00134     ret = posix_spawn(&amp;usrProcsID,usrProcess,NULL,NULL,argv,(<span class="keywordtype">char</span>**)NULL);
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<a name="l00135"></a>00135     <span class="keywordflow">if</span>(ret != 0)     
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<a name="l00136"></a>00136         {         
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<a name="l00137"></a>00137         printf(<span class="stringliteral">"\n*** failure posix_spawn ***\n"</span>);        
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<a name="l00138"></a>00138         <span class="keywordflow">return</span> EXIT_FAILURE;     
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<a name="l00139"></a>00139         }
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<a name="l00140"></a>00140      rewind(gfp);
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<a name="l00141"></a>00141      printf(<span class="stringliteral">"Starting to read from the file\n"</span>);
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<a name="l00142"></a>00142      <span class="keywordflow">for</span>(num=1; num&lt;=count; num++)
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<a name="l00143"></a>00143          {
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<a name="l00144"></a>00144          sleep (delay);       
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<a name="l00145"></a>00145          printf(<span class="stringliteral">"Name (%d)="</span>, num);
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<a name="l00146"></a>00146          <span class="keywordflow">while</span>((ch=(fgetc(gfp))) != <span class="charliteral">'\n'</span>)
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<a name="l00147"></a>00147                   {
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<a name="l00148"></a>00148                   putchar(ch);
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<a name="l00149"></a>00149                   }
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<a name="l00150"></a>00150          printf(<span class="stringliteral">"\n"</span>);
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<a name="l00151"></a>00151          
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<a name="l00152"></a>00152          }
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<a name="l00153"></a>00153     <span class="keywordflow">if</span>(!fclose(gfp))
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<a name="l00154"></a>00154         {
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<a name="l00155"></a>00155         <span class="keyword">remove</span>(testfile);
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<a name="l00156"></a>00156         gfp = NULL;
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<a name="l00157"></a>00157         printf(<span class="stringliteral">"File closed successfully\n"</span>);
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<a name="l00158"></a>00158         }
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<a name="l00159"></a>00159     <span class="keywordflow">else</span>
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<a name="l00160"></a>00160         {
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<a name="l00161"></a>00161         printf(<span class="stringliteral">"File close failed\n"</span>);
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<a name="l00162"></a>00162         }
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<a name="l00163"></a>00163   
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<a name="l00164"></a>00164     PressKey();
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<a name="l00165"></a>00165     <span class="keywordflow">return</span> EXIT_SUCCESS;
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<a name="l00166"></a>00166     }
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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>