Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/ipcparent_8c_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/PIPS/IPC/src/parent/ipcparent.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// ipcparent.c</span>
<a name="l00002"></a>00002 <span class="comment">//</span>
<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2007-2009 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:</span>
<a name="l00016"></a>00016 <span class="comment">//</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="comment">//</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#include <stdio.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <fcntl.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <unistd.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <sys/stat.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <errno.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <spawn.h></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <string.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <sys/wait.h></span>
<a name="l00029"></a>00029
<a name="l00034"></a>00034 <span class="keywordtype">char</span> PressKey()
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036 <span class="keywordtype">char</span> ch;
<a name="l00037"></a>00037 fflush(stdout);
<a name="l00038"></a>00038 ch=getchar();
<a name="l00039"></a>00039 <span class="keywordflow">return</span> ch;
<a name="l00040"></a>00040 }
<a name="l00041"></a>00041
<a name="l00047"></a>00047 <span class="keywordtype">int</span> Error(<span class="keywordtype">char</span> msg[])
<a name="l00048"></a>00048 {
<a name="l00050"></a>00050 printf(<span class="stringliteral">"%s [Error NUMBER = %d]\n"</span>,msg,errno);
<a name="l00051"></a>00051 PressKey();
<a name="l00052"></a>00052 <span class="keywordflow">return</span> EXIT_FAILURE;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordtype">int</span> <a class="code" href="redirectprintf_8c.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>()
<a name="l00056"></a>00056 {
<a name="l00058"></a>00058 FILE* childProcessStream;
<a name="l00060"></a>00060 <span class="keywordtype">char</span> fifoFileName[] = <span class="stringliteral">"myfifofile"</span>;
<a name="l00062"></a>00062 <span class="keywordtype">char</span> fifoExecFileName[] = <span class="stringliteral">"z:\\sys\\bin\\fifochild"</span>;
<a name="l00064"></a>00064 <span class="keywordtype">char</span> popenExecFileName[] = <span class="stringliteral">"z:\\sys\\bin\\ipcchild"</span>;
<a name="l00066"></a>00066 pid_t fifoChildPid;
<a name="l00068"></a>00068 <span class="keywordtype">int</span> fifoRetVal;
<a name="l00069"></a>00069 <span class="keywordtype">int</span> unlinkResult;
<a name="l00070"></a>00070 <span class="keywordtype">int</span> fifoResult;
<a name="l00072"></a>00072 <span class="keywordtype">int</span> childProcessFD;
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="keywordtype">char</span> **argv=(<span class="keywordtype">char</span>**)malloc(2*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>*));
<a name="l00075"></a>00075 argv[0]=(<span class="keywordtype">char</span>*)malloc(50*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
<a name="l00076"></a>00076 argv[1] = 0;
<a name="l00077"></a>00077 strcpy(argv[0], fifoExecFileName);
<a name="l00078"></a>00078
<a name="l00082"></a>00082 unlinkResult=unlink(fifoFileName);
<a name="l00083"></a>00083 fifoResult = mkfifo(fifoFileName,S_IXGRP);
<a name="l00085"></a>00085 <span class="keywordflow">if</span>(fifoResult == -1)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 Error(<span class="stringliteral">"*** failure mkfifo ***"</span>);
<a name="l00088"></a>00088 PressKey();
<a name="l00089"></a>00089 <span class="keywordflow">return</span> EXIT_FAILURE;
<a name="l00090"></a>00090 }
<a name="l00092"></a>00092 fifoRetVal = posix_spawn(&fifoChildPid, fifoExecFileName, NULL, NULL, argv, (<span class="keywordtype">char</span>**)NULL);
<a name="l00094"></a>00094 free((<span class="keywordtype">void</span>*)argv[0]);
<a name="l00095"></a>00095 free((<span class="keywordtype">void</span>*)argv);
<a name="l00096"></a>00096 <span class="keywordflow">if</span>(fifoRetVal != 0)
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 printf(<span class="stringliteral">"failure posix_spawn [Error NUMBER = %d]\n"</span>,errno);
<a name="l00099"></a>00099 unlinkResult=unlink(fifoFileName);
<a name="l00100"></a>00100 <span class="keywordflow">if</span>(unlinkResult!=0)
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 printf(<span class="stringliteral">"failure posix_spawn [Error NUMBER = %d]\n"</span>,errno);
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 PressKey();
<a name="l00105"></a>00105 <span class="keywordflow">return</span> EXIT_FAILURE;
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107 <span class="keywordflow">else</span>
<a name="l00108"></a>00108 {
<a name="l00110"></a>00110 <span class="keywordtype">int</span> fifoFd = open(fifoFileName,O_RDONLY);
<a name="l00112"></a>00112 <span class="keywordflow">if</span>(fifoFd == -1)
<a name="l00113"></a>00113 {
<a name="l00115"></a>00115 Error(<span class="stringliteral">"*** failure FIFO Open ***"</span>);
<a name="l00116"></a>00116 PressKey();
<a name="l00117"></a>00117 <span class="keywordflow">return</span> EXIT_FAILURE;
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 <span class="keywordflow">else</span>
<a name="l00120"></a>00120 {
<a name="l00122"></a>00122 <span class="keywordtype">char</span> buffer[100];
<a name="l00123"></a>00123 <span class="keywordtype">int</span> nbytes;
<a name="l00124"></a>00124 memset(buffer,0,<span class="keyword">sizeof</span>(buffer));
<a name="l00126"></a>00126 nbytes = read(fifoFd,buffer,<span class="keyword">sizeof</span>(buffer));
<a name="l00127"></a>00127 printf(<span class="stringliteral">"\nBytes Received=%d, Message Received from fifochild using [FIFO]=%s"</span>,nbytes,buffer);
<a name="l00129"></a>00129 (void)close(fifoFd);
<a name="l00130"></a>00130 }
<a name="l00132"></a>00132 childProcessStream = popen(popenExecFileName,<span class="stringliteral">"r"</span>);
<a name="l00134"></a>00134 <span class="keywordflow">if</span>(childProcessStream == NULL)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136 Error(<span class="stringliteral">"\n Failure to create child process with popen()"</span>);
<a name="l00137"></a>00137 PressKey();
<a name="l00138"></a>00138 <span class="keywordflow">return</span> EXIT_FAILURE;
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 <span class="keywordflow">else</span>
<a name="l00141"></a>00141 {
<a name="l00143"></a>00143 <span class="keywordtype">char</span> buffer[100];
<a name="l00145"></a>00145 <span class="keywordtype">int</span> nbytes;
<a name="l00147"></a>00147 childProcessFD = fileno(childProcessStream);
<a name="l00148"></a>00148 memset(buffer,0,<span class="keyword">sizeof</span>(buffer));
<a name="l00149"></a>00149 printf(<span class="stringliteral">"\n\nWaiting for message from Child[popen()]\n"</span>);
<a name="l00151"></a>00151 nbytes = read(childProcessFD,buffer,<span class="keyword">sizeof</span>(buffer));
<a name="l00152"></a>00152 printf(<span class="stringliteral">"Bytes Received=%d, Message Received from ipcchild using[popen()]=%s\n[ok]\n"</span>,nbytes,buffer);
<a name="l00154"></a>00154 pclose(childProcessStream);
<a name="l00155"></a>00155 }
<a name="l00157"></a>00157 (void)waitpid(fifoChildPid,NULL,0);
<a name="l00159"></a>00159 unlinkResult=unlink(fifoFileName);
<a name="l00160"></a>00160 <span class="keywordflow">if</span>(unlinkResult!=0)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 Error(<span class="stringliteral">"Unlink error"</span>);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 printf(<span class="stringliteral">"Press any key to exit..."</span>);
<a name="l00166"></a>00166 PressKey();
<a name="l00167"></a>00167 <span class="keywordflow">return</span> EXIT_SUCCESS;
<a name="l00168"></a>00168 }
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