//controller.c

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

#define BUFSIZE 256

main()
{
    int c1p[2]; //pipe to link c1 to c2
    int c1pid;  //parent ID
    int c1status;

    int c2p[2]; //pipe
    int c2pid;  //parent ID
    int c2status;

    int c3p[2]; //pipe
    int c3pid;  //parent ID
    int c3status;

    //buffer to store user words
    char buffer[BUFSIZE];

    //initialize pipes
    pipe(c1p);
    pipe(c3p);



    //begin child process of c1
    c1pid = fork();
    if (c1pid == 0) {
        //set the newfd to be the duplicate descrition of the program
        int newfd = dup2(c1p[1],1);
        //if the duplication failed
        if (newfd != 1)
        {
            fprintf(stderr,"unable to duplicate newfd \n");
            exit(1);
        }
        //execute the program
        execvp("./c1", NULL);
        //close the program
        close(c1p[0]);


    } else {
        //wait for the child process to finish
        c1pid = wait(&c1status);
        //print the exit status
        int es = WEXITSTATUS(c1status);
        printf("c1 finished \n");
        printf("Exit status was %d\n\n", es);

    }


    //begin child process of c2

    c2pid = fork();
    if (c2pid == 0) {
        //rediredt the stdout to the stdin of c2
        dup2(c1p[1],0);
        close(c1p[1]);
        //set the newfd to be the duplicate descrition of the program

        int newfd = dup2(c2p[1],1);
        //if the duplication failed

        if (newfd != 1)
        {
            fprintf(stderr,"unable to duplicate newfd \n");
            exit(1);
        }
        //execute the program
        execvp("./c2", NULL);
        //close the prog
        close(c2p[0]);




    } else {
        //wait for the child process to finish
        c2pid = wait(&c2status);
        int es = WEXITSTATUS(c2status);
        //print the exit status
        printf("c2 finished \n");
        printf("Exit status was %d\n\n", es);
    }


    //begin child process of c3
    c3pid = fork();
    if (c3pid == 0) {
        //rediredt the stdout to the stdin of c3
        dup2(c3p[0],0);
        int newfd = dup2(c3p[0],0);
        //ecxecute the program
        execvp("./c3", NULL);
        //close the program
        close(c3p[1]);

    } else {
        //wait for the child process to finish
        c3pid = wait(&c3status);
        //print the exit status
        int es = WEXITSTATUS(c3status);
        printf("c3 finished \n");
        printf("Exit status was %d\n\n", es);
    }

}