#include <stdio.h>
main(char * argv[],int argc)
{
  char a[10];
  int pid,fd[2], fd1[2], fd2[2];
  int c;
  int i;

  if (pipe(fd2) == -1)
  {
     fprintf(stderr," pipe failed \n");
     exit(-1);
  }
  if (pipe(fd) == -1)
  {
     fprintf(stderr," pipe failed \n");
     exit(-1);
  }

  if (pipe(fd1) == -1)
  {
     fprintf(stderr," pipe failed \n");
     exit(-1);
  }

  switch (pid = fork())
  {
     case  -1 :  fprintf(stderr," fork failed \n");
                 exit(-2);
     case   0 :  if (close(fd[1]) == -1) /* child process */
                 {
                    fprintf(stderr," close\n");
                    exit(-3);
                 }
                 sleep(5);
	         if ((c = read(fd[0],a,10)) < 0)
		     fprintf(stderr," read error\n");
	         else
		 {
		     a[c] = 0;
		     printf("message received %s\n",a);
		     if (write(fd1[1],"child0",6) <= 0)
			 fprintf(stderr,"error in 0\n");
		 }
                 if (write(fd2[1],"msg1",4) < 0)
                    fprintf(stderr,"error in child writing\n");
	         exit(0);
     default :  /* parent process */
	        pid = fork();
	        if (pid == 0) /* another child */
		{
		    if ((c = read(fd[0],a,10)) < 0)
			fprintf(stderr," read error\n");
		    else
		    {
			a[c] = 0;
			printf("message received in 1 %s\n",a);
			if (write(fd1[1],"child1",6) <= 0)
			    fprintf(stderr,"error in 1\n");
		    }
                    if ((c = read(fd2[0],a,10)) < 0)
                       fprintf(stderr, "error reading\n");
                    else
                    {
                        a[c] = 0;
                        printf(" read in second child %s\n",a);

                    }
		    exit(0);
		}
  }
  if (close(fd[0]) == -1)
  {
     fprintf(stderr," close2 \n");
     exit(-4);
  }
  if (write(fd[1],"hello",5) == -1)
  {
     fprintf(stderr," write error \n");
     exit(-5);
  }
  i = 6;
  if (write(fd[1],"hello1", 6) == -1)
  {
     fprintf(stderr," write int error \n");
     exit(-6);
  }
  if ((c = read(fd1[0],a,10)) < 0)
      fprintf(stderr, " read error\n");
  a[c] = 0;
  printf("%s\n",a);
  if ((c = read(fd1[0],a,10)) < 0)
      fprintf(stderr, " read error\n");
  a[c] = 0;
  printf("%s\n",a);
  while (wait((int *)0) != pid) /* wait child to terminate */
    ;
}