examples/PIPS/IPC/src/parent/ipcparent.c

// ipcparent.c
//
/*
Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
*/




#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include <spawn.h>
#include <string.h>
#include <sys/wait.h>

char PressKey()
        {
        char ch;
        fflush(stdout);
        ch=getchar();
        return ch;
        }

int Error(char msg[])
        {
        printf("%s [Error NUMBER = %d]\n",msg,errno);
        PressKey();
        return EXIT_FAILURE;
        }

int main()
        {
        FILE* childProcessStream;
        char fifoFileName[] = "myfifofile";
        char fifoExecFileName[] = "z:\\sys\\bin\\fifochild";
        char popenExecFileName[] = "z:\\sys\\bin\\ipcchild";
        pid_t fifoChildPid;
        int fifoRetVal;
        int unlinkResult;
        int fifoResult;
        int     childProcessFD;
        
        char **argv=(char**)malloc(2*sizeof(char*));
    argv[0]=(char*)malloc(50*sizeof(char));
        argv[1] = 0;
        strcpy(argv[0], fifoExecFileName);

    unlinkResult=unlink(fifoFileName);
        fifoResult = mkfifo(fifoFileName,S_IXGRP);
        if(fifoResult == -1)
                {
                        Error("*** failure mkfifo ***");
                        PressKey();
                        return EXIT_FAILURE;
                }
        fifoRetVal  = posix_spawn(&fifoChildPid, fifoExecFileName, NULL, NULL, argv, (char**)NULL);
        free((void*)argv[0]);
        free((void*)argv);
        if(fifoRetVal != 0)
                {
                printf("failure posix_spawn [Error NUMBER = %d]\n",errno);
        unlinkResult=unlink(fifoFileName);
        if(unlinkResult!=0)
            {
            printf("failure posix_spawn [Error NUMBER = %d]\n",errno);
            }
                PressKey();
                return EXIT_FAILURE;
                }
        else
                {
                int fifoFd = open(fifoFileName,O_RDONLY);
                if(fifoFd == -1)
                        {
                        Error("*** failure FIFO Open ***");
                        PressKey();
                        return EXIT_FAILURE;
                        }
                else
                        {
                        char buffer[100];
                        int nbytes;
                        memset(buffer,0,sizeof(buffer));
                        nbytes = read(fifoFd,buffer,sizeof(buffer));
                        printf("\nBytes Received=%d, Message Received from fifochild using [FIFO]=%s",nbytes,buffer);
                        (void)close(fifoFd);
                        }
                childProcessStream = popen(popenExecFileName,"r");
                if(childProcessStream == NULL)
                        {
                        Error("\n Failure to create child process with popen()");
                        PressKey();
                        return EXIT_FAILURE;
                        }
                else
                        {
                        char buffer[100];
                        int nbytes;
                        childProcessFD = fileno(childProcessStream);
                        memset(buffer,0,sizeof(buffer));
                        printf("\n\nWaiting for message from Child[popen()]\n");
                        nbytes = read(childProcessFD,buffer,sizeof(buffer));
                        printf("Bytes Received=%d, Message Received from ipcchild using[popen()]=%s\n[ok]\n",nbytes,buffer);
                        pclose(childProcessStream);
                        }
                (void)waitpid(fifoChildPid,NULL,0);
                unlinkResult=unlink(fifoFileName);
                if(unlinkResult!=0)
                        {
                        Error("Unlink error");
                        }
                }
        printf("Press any key to exit...");
        PressKey();
        return EXIT_SUCCESS;
        }

---