#include <stdio.h>
#include <unistd.h>
int main() {
 pid_t newpid;
 int fd1[2], fd2[2];

 char m1[] = "Final Exam 2013\n";
  char m2[] = "Today is 10th December\n";

  char rbuf1[256];
  char rbuf2[256];
  int cn1, cn2;

  if ((pipe(fd1)== -1)) printf(" error \n");
  printf("fd1 %d %d  \n", fd1[0], fd1[1]);

  dup(fd1[0]);
  dup(fd1[1]); //#1 show the open file descriptor table here
  
  write(4, m1, sizeof(m1));
  cn1 = read(5, rbuf1, 256);
  write(1, rbuf1, cn1);  //#2 show the structure of pipe fd1 with the respect the current process  
 
 if ((pipe(fd2)== -1)) printf(" error \n");
  printf("fd1 %d %d  \n", fd2[0], fd2[1]);

  if ((newpid = fork()) == -1) { printf("error \n"); return 0;}
 
 if (newpid >0 )
    {   //parent
    write(4, m2, sizeof(m2)); //#3 show the open file descriptor table here
  }
 else { //child
    cn2 = read(3, rbuf2, 256);
    write(1, rbuf2,cn2);   
  
    int fd3[2];
    if ((pipe(fd3)== -1)) printf(" error \n");
    printf("fd1 %d %d  \n", fd3[0], fd3[1]);    //#4 Show the open file descriptor table for parent + child 
    // other code
 }
  return 0; }