#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#define MSGSIZE  16

char *msg1 = "hello #1";
char *msg2 = "hello #2";
char *msg3 = "hello #3";

main()
{
  char inbuf[MSGSIZE];
  char inbuf2[MSGSIZE];
  int p[2], j;

  /* open pipe */

  if(pipe(p) == -1)
    {
      perror("pipe call error");
      exit(1);
    }

  /* write down pipe */
  write(p[1], msg1, MSGSIZE);
  write(p[1], msg2, MSGSIZE);
  write(p[1], msg3, MSGSIZE);

  /* read pipe */
  for(j=0; j<3; j++)
    {
      read(p[0], inbuf, MSGSIZE);
      printf("%s\n", inbuf);
    }

  /* write down pipe */
  write(p[0], msg1, MSGSIZE);
  write(p[0], msg2, MSGSIZE);
  write(p[0], msg3, MSGSIZE);

  /* read pipe */
  for(j=0; j<3; j++)
    {
      read(p[1], inbuf2, MSGSIZE);
      printf("%s\n", inbuf2);
    }



  exit(0);
}