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

int main(int argc, char **argv)
{
    int fileDescriptors[2]; //used for the pipe command
    pid_t childProcessID1;
    pid_t childProcessID2;
    int result;             //store the return Value
    char buf;


    //Create the interprocess channel
    result = pipe(fileDescriptors);
    if(result < 0)
    {
        //error while creating pipe
        perror("pipe");
        exit(1);
    }

    //Creating the child Process
    childProcessID1 = fork();
    if(childProcessID1 < 0)
    {
        //error while forking
        perror("fork");
        exit(2);
    }

    //Redirect STDOUT and execute first command
    if(childProcessID1 == 0)
    {
        if(dup2(fileDescriptors[1], STDOUT_FILENO) == -1)   //Map STDOUT on write end of Communication Channel
            perror("dup2");
        if (close (fileDescriptors [0]) == -1)
            perror ("close");
        execlp(argv[1], argv[1], NULL);
        return 0;
    }

    //Redirect STDOUT and execute first command
    if(dup2(fileDescriptors[0], STDIN_FILENO) == -1)    //Map STDIN on read end of Communication Channel to get the data from the first command
        perror("dup2");
    if (close (fileDescriptors [1]) == -1)
        perror ("close");
    execlp(argv[2], argv[2], NULL);
}