Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/sigterm_signal_8c_source.html
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+<title>TB9.2 Example Applications: examples/PIPS/posixsignals/sigtermSignal/src/sigtermSignal.c Source File</title>
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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>
+<a name="l00002"></a>00002 <span class="comment">//</span>
+<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).</span>
+<a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span>
+<a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span>
+<a name="l00006"></a>00006 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
+<a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span>
+<a name="l00008"></a>00008 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
+<a name="l00009"></a>00009 <span class="comment">//</span>
+<a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span>
+<a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</span>
+<a name="l00012"></a>00012 <span class="comment">//</span>
+<a name="l00013"></a>00013 <span class="comment">// Contributors:</span>
+<a name="l00014"></a>00014 <span class="comment">//</span>
+<a name="l00015"></a>00015 <span class="comment">// Description: The source code file for sigtermSignal.</span>
+<a name="l00016"></a>00016 <span class="comment">//</span>
+<a name="l00017"></a>00017
+<a name="l00018"></a>00018 <span class="preprocessor">#include <stdio.h></span>
+<a name="l00019"></a>00019 <span class="preprocessor">#include <string.h></span>
+<a name="l00020"></a>00020 <span class="preprocessor">#include <stdlib.h></span>
+<a name="l00021"></a>00021 <span class="preprocessor">#include <unistd.h></span>
+<a name="l00022"></a>00022 <span class="preprocessor">#include <sys/types.h></span>
+<a name="l00023"></a>00023 <span class="preprocessor">#include <signal.h></span>
+<a name="l00024"></a>00024 <span class="preprocessor">#include <e32def.h></span>
+<a name="l00025"></a>00025 <span class="preprocessor">#include <time.h></span>
+<a name="l00026"></a>00026 <span class="preprocessor">#include <spawn.h></span>
+<a name="l00027"></a>00027
+<a name="l00028"></a>00028 FILE *gfp = NULL;
+<a name="l00029"></a>00029 <span class="keywordtype">char</span> *testfile = <span class="stringliteral">"C:\\testfile.txt"</span>;
+<a name="l00030"></a>00030
+<a name="l00034"></a>00034 <span class="keywordtype">void</span> PressKey()
+<a name="l00035"></a>00035 {
+<a name="l00036"></a>00036 <span class="keywordtype">int</span> ch;
+<a name="l00037"></a>00037 printf(<span class="stringliteral">"Press 'e'+Enter to exit\n"</span>);
+<a name="l00038"></a>00038 <span class="keywordflow">while</span>((ch=getchar())!= <span class="charliteral">'e'</span>)
+<a name="l00039"></a>00039 {
+<a name="l00040"></a>00040 <span class="keywordflow">if</span>(ch == <span class="charliteral">'\n'</span>)
+<a name="l00041"></a>00041 <span class="keywordflow">continue</span>;
+<a name="l00042"></a>00042 <span class="keywordflow">else</span>
+<a name="l00043"></a>00043 printf(<span class="stringliteral">"wrong option selected, please try again!!!\n"</span>);
+<a name="l00044"></a>00044 }
+<a name="l00045"></a>00045 }
+<a name="l00052"></a>00052 <span class="keywordtype">void</span> SIGTERM_handler(<span class="keywordtype">int</span> signum)
+<a name="l00053"></a>00053 {
+<a name="l00054"></a>00054 <span class="keywordflow">if</span>(signum == SIGTERM)
+<a name="l00055"></a>00055 {
+<a name="l00056"></a>00056 <span class="keywordflow">if</span>(gfp != NULL)
+<a name="l00057"></a>00057 {
+<a name="l00058"></a>00058 printf(<span class="stringliteral">"Received the SIGTERM signal from the raiseSignal process\n"</span>);
+<a name="l00059"></a>00059 fclose(gfp);
+<a name="l00060"></a>00060 <span class="keyword">remove</span>(testfile);
+<a name="l00061"></a>00061 gfp = NULL;
+<a name="l00062"></a>00062 printf(<span class="stringliteral">"The open file descriptor was closed\n"</span>);
+<a name="l00063"></a>00063 PressKey();
+<a name="l00064"></a>00064 exit (0);
+<a name="l00065"></a>00065 }
+<a name="l00066"></a>00066 }
+<a name="l00067"></a>00067 }
+<a name="l00068"></a>00068
+<a name="l00078"></a>00078 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
+<a name="l00079"></a>00079 {
+<a name="l00080"></a>00080 <span class="keywordtype">char</span> input[11];
+<a name="l00081"></a>00081 <span class="keywordtype">int</span> count = 0,num;
+<a name="l00082"></a>00082 <span class="keywordtype">int</span> ch,ret;
+<a name="l00083"></a>00083 pid_t usrProcsID;
+<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>
+<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>
+<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>
+<a name="l00087"></a>00087
+<a name="l00088"></a>00088 <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>
+<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>
+<a name="l00090"></a>00090 argv[0] = (<span class="keywordtype">char</span>*)malloc(size*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
+<a name="l00091"></a>00091 argv[1] = (<span class="keywordtype">char</span>*)malloc(index*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
+<a name="l00092"></a>00092 argv[2] = NULL;
+<a name="l00093"></a>00093
+<a name="l00094"></a>00094
+<a name="l00095"></a>00095 strcpy(argv[0], <span class="stringliteral">"z:\\sys\\bin\\raisesignal.exe"</span>); <span class="comment">//argv[0] holding name of the child process.</span>
+<a name="l00096"></a>00096 sprintf(argv[1],<span class="stringliteral">"%d"</span>,getpid()); <span class="comment">//argv[1] holding parent pid.</span>
+<a name="l00097"></a>00097
+<a name="l00098"></a>00098 printf(<span class="stringliteral">"*****************************************************************************************\n"</span>);
+<a name="l00099"></a>00099 printf(<span class="stringliteral">"* Welcome to the demonstration of a graceful process termination using a SIGTERM signal *\n"</span>);
+<a name="l00100"></a>00100 printf(<span class="stringliteral">"*****************************************************************************************\n"</span>);
+<a name="l00101"></a>00101
+<a name="l00102"></a>00102 printf(<span class="stringliteral">"* This example shows how a SIGTERM signal can be used to gracefully terminate a process.\n"</span>);
+<a name="l00103"></a>00103 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>);
+<a name="l00104"></a>00104 printf(<span class="stringliteral">"* It then simultaneously spawns a raiseSignal process and starts reading from the file.\n"</span>);
+<a name="l00105"></a>00105 printf(<span class="stringliteral">"* The raiseSignal process sends a SIGTERM signal to the sigtermSignal process.\n"</span>);
+<a name="l00106"></a>00106 printf(<span class="stringliteral">"* On receiving the SIGTERM signal, the sigtermSignal process closes all the \nopen file descriptors and prepares to exit.\n"</span>);
+<a name="l00107"></a>00107
+<a name="l00108"></a>00108 printf(<span class="stringliteral">"\nPress the Enter key to continue\n"</span>);
+<a name="l00109"></a>00109 getchar();
+<a name="l00110"></a>00110
+<a name="l00111"></a>00111 signal(SIGTERM, SIGTERM_handler);
+<a name="l00112"></a>00112 printf(<span class="stringliteral">"************ In the sigtermSignal process ************\n"</span>);
+<a name="l00113"></a>00113 printf(<span class="stringliteral">"Enter the number of names you want to enter (e.g. 8) :\n"</span>);
+<a name="l00114"></a>00114 scanf(<span class="stringliteral">"%d"</span>, &count);
+<a name="l00115"></a>00115 gfp=fopen(testfile, <span class="stringliteral">"w+"</span>); <span class="comment">//Opening the file for read and write.</span>
+<a name="l00116"></a>00116 <span class="keywordflow">if</span>(gfp != NULL)
+<a name="l00117"></a>00117 {
+<a name="l00118"></a>00118 printf(<span class="stringliteral">"File open sucessful\n"</span>);
+<a name="l00119"></a>00119 }
+<a name="l00120"></a>00120 <span class="keywordflow">else</span>
+<a name="l00121"></a>00121 {
+<a name="l00122"></a>00122 printf(<span class="stringliteral">"File open failed\n"</span>);
+<a name="l00123"></a>00123 }
+<a name="l00124"></a>00124 <span class="keywordflow">for</span>(num=1; num<=count; num++)
+<a name="l00125"></a>00125 {
+<a name="l00126"></a>00126 printf(<span class="stringliteral">"Name (%d)="</span>, num);
+<a name="l00127"></a>00127 scanf(<span class="stringliteral">"%s"</span>, input);
+<a name="l00128"></a>00128 fprintf(gfp, <span class="stringliteral">"%s\n"</span>, input);
+<a name="l00129"></a>00129 }
+<a name="l00130"></a>00130
+<a name="l00131"></a>00131 printf(<span class="stringliteral">"Press the Enter key to spawn the raiseSignal process\n"</span>);
+<a name="l00132"></a>00132 getchar();
+<a name="l00133"></a>00133 getchar();
+<a name="l00134"></a>00134 <span class="comment">//Spawning raiseSignal process to accept user input.</span>
+<a name="l00135"></a>00135 ret = posix_spawn(&usrProcsID,usrProcess,NULL,NULL,argv,(<span class="keywordtype">char</span>**)NULL);
+<a name="l00136"></a>00136 <span class="keywordflow">if</span>(ret != 0)
+<a name="l00137"></a>00137 {
+<a name="l00138"></a>00138 printf(<span class="stringliteral">"\n*** failure posix_spawn ***\n"</span>);
+<a name="l00139"></a>00139 <span class="keywordflow">return</span> EXIT_FAILURE;
+<a name="l00140"></a>00140 }
+<a name="l00141"></a>00141 rewind(gfp);
+<a name="l00142"></a>00142 printf(<span class="stringliteral">"Starting to read from the file\n"</span>);
+<a name="l00143"></a>00143 <span class="keywordflow">for</span>(num=1; num<=count; num++)
+<a name="l00144"></a>00144 {
+<a name="l00145"></a>00145 sleep (delay);
+<a name="l00146"></a>00146 printf(<span class="stringliteral">"Name (%d)="</span>, num);
+<a name="l00147"></a>00147 <span class="keywordflow">while</span>((ch=(fgetc(gfp))) != <span class="charliteral">'\n'</span>)
+<a name="l00148"></a>00148 {
+<a name="l00149"></a>00149 putchar(ch);
+<a name="l00150"></a>00150 }
+<a name="l00151"></a>00151 printf(<span class="stringliteral">"\n"</span>);
+<a name="l00152"></a>00152
+<a name="l00153"></a>00153 }
+<a name="l00154"></a>00154 <span class="keywordflow">if</span>(!fclose(gfp))
+<a name="l00155"></a>00155 {
+<a name="l00156"></a>00156 <span class="keyword">remove</span>(testfile);
+<a name="l00157"></a>00157 gfp = NULL;
+<a name="l00158"></a>00158 printf(<span class="stringliteral">"File closed successfully\n"</span>);
+<a name="l00159"></a>00159 }
+<a name="l00160"></a>00160 <span class="keywordflow">else</span>
+<a name="l00161"></a>00161 {
+<a name="l00162"></a>00162 printf(<span class="stringliteral">"File close failed\n"</span>);
+<a name="l00163"></a>00163 }
+<a name="l00164"></a>00164
+<a name="l00165"></a>00165 PressKey();
+<a name="l00166"></a>00166 <span class="keywordflow">return</span> EXIT_SUCCESS;
+<a name="l00167"></a>00167 }
+</pre></div></div>
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