TB9.2 Example Applications: examples/PIPS/IPC/src/parent/ipcparent.c Source File

00001 // ipcparent.c
+00002 //
+00003 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+00004 // All rights reserved.
+00005 // This component and the accompanying materials are made available
+00006 // under the terms of "Eclipse Public License v1.0"
+00007 // which accompanies this distribution, and is available
+00008 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
+00009 //
+00010 // Initial Contributors:
+00011 // Nokia Corporation - initial contribution.
+00012 //
+00013 // Contributors:
+00014 //
+00015 // Description:
+00016 //
+00017 
+00018 //
+00019 
+00020 #include <stdio.h>
+00021 #include <fcntl.h>
+00022 #include <unistd.h>
+00023 #include <stdlib.h>
+00024 #include <sys/stat.h>
+00025 #include <errno.h>
+00026 #include <spawn.h>
+00027 #include <string.h>
+00028 #include <sys/wait.h>
+00029 
+00034 char PressKey()
+00035         {
+00036         char ch;
+00037         fflush(stdout);
+00038         ch=getchar();
+00039         return ch;
+00040         }
+00041 
+00047 int Error(char msg[])
+00048         {
+00050         printf("%s [Error NUMBER = %d]\n",msg,errno);
+00051         PressKey();
+00052         return EXIT_FAILURE;
+00053         }
+00054 
+00055 int main()
+00056         {
+00058         FILE* childProcessStream;
+00060         char fifoFileName[] = "myfifofile";
+00062         char fifoExecFileName[] = "z:\\sys\\bin\\fifochild";
+00064         char popenExecFileName[] = "z:\\sys\\bin\\ipcchild";
+00066         pid_t fifoChildPid;
+00068         int fifoRetVal;
+00069         int unlinkResult;
+00070         int fifoResult;
+00072         int     childProcessFD;
+00073         
+00074         char **argv=(char**)malloc(2*sizeof(char*));
+00075     argv[0]=(char*)malloc(50*sizeof(char));
+00076         argv[1] = 0;
+00077         strcpy(argv[0], fifoExecFileName);
+00078 
+00082     unlinkResult=unlink(fifoFileName);
+00083         fifoResult = mkfifo(fifoFileName,S_IXGRP);
+00085         if(fifoResult == -1)
+00086                 {
+00087                         Error("*** failure mkfifo ***");
+00088                         PressKey();
+00089                         return EXIT_FAILURE;
+00090                 }
+00092         fifoRetVal  = posix_spawn(&fifoChildPid, fifoExecFileName, NULL, NULL, argv, (char**)NULL);
+00094         free((void*)argv[0]);
+00095         free((void*)argv);
+00096         if(fifoRetVal != 0)
+00097                 {
+00098                 printf("failure posix_spawn [Error NUMBER = %d]\n",errno);
+00099         unlinkResult=unlink(fifoFileName);
+00100         if(unlinkResult!=0)
+00101             {
+00102             printf("failure posix_spawn [Error NUMBER = %d]\n",errno);
+00103             }
+00104                 PressKey();
+00105                 return EXIT_FAILURE;
+00106                 }
+00107         else
+00108                 {
+00110                 int fifoFd = open(fifoFileName,O_RDONLY);
+00112                 if(fifoFd == -1)
+00113                         {
+00115                         Error("*** failure FIFO Open ***");
+00116                         PressKey();
+00117                         return EXIT_FAILURE;
+00118                         }
+00119                 else
+00120                         {
+00122                         char buffer[100];
+00123                         int nbytes;
+00124                         memset(buffer,0,sizeof(buffer));
+00126                         nbytes = read(fifoFd,buffer,sizeof(buffer));
+00127                         printf("\nBytes Received=%d, Message Received from fifochild using [FIFO]=%s",nbytes,buffer);
+00129                         (void)close(fifoFd);
+00130                         }
+00132                 childProcessStream = popen(popenExecFileName,"r");
+00134                 if(childProcessStream == NULL)
+00135                         {
+00136                         Error("\n Failure to create child process with popen()");
+00137                         PressKey();
+00138                         return EXIT_FAILURE;
+00139                         }
+00140                 else
+00141                         {
+00143                         char buffer[100];
+00145                         int nbytes;
+00147                         childProcessFD = fileno(childProcessStream);
+00148                         memset(buffer,0,sizeof(buffer));
+00149                         printf("\n\nWaiting for message from Child[popen()]\n");
+00151                         nbytes = read(childProcessFD,buffer,sizeof(buffer));
+00152                         printf("Bytes Received=%d, Message Received from ipcchild using[popen()]=%s\n[ok]\n",nbytes,buffer);
+00154                         pclose(childProcessStream);
+00155                         }
+00157                 (void)waitpid(fifoChildPid,NULL,0);
+00159                 unlinkResult=unlink(fifoFileName);
+00160                 if(unlinkResult!=0)
+00161                         {
+00162                         Error("Unlink error");
+00163                         }
+00164                 }
+00165         printf("Press any key to exit...");
+00166         PressKey();
+00167         return EXIT_SUCCESS;
+00168         }
+