/* 
    Author     : abhijithvijayan
    Created on : 1 Apr 19, 10:37
    title      : Pipe() System call
    Aim        : Interprocess communication with pipe()
*/

#include <stdio.h>
#include <unistd.h>

int main()
{
    int pipeFds[2], status, pId;
    char writeMsg[20] = "hello world";
    char readMsg[20];

    status = pipe(pipeFds);

    if (status == -1)
    {
        printf("Unable to create pipe\n");
        return 1;
    }

    pId = fork();

    // child process
    if (pId == 0)
    {
        read(pipeFds[0], readMsg, sizeof(readMsg));
        printf("\nChild Process receives data\n%s\n", readMsg);
    }
    // parent process
    else if (pId > 0)
    {
        printf("Parent Process sends data\n%s", writeMsg);
        write(pipeFds[1], writeMsg, sizeof(writeMsg));
    }

    return 0;
}