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

int main(int argc, char **argv)
{
  int pfd[2], rb;
  char buff[100];
  
  if (pipe(pfd)<0)
  {
    return -1;
  }

  close(pfd[1]);
 
  if (fork())
  {
    
    sleep(5);
    write(pfd[1], "hello world\n", sizeof("hello world\n"));
    wait(NULL);
  }
  else
  {
    rb = read(pfd[0], buff, sizeof(buff));
    if (rb < 0)
      perror("SON: read");
    else
    {
      printf("SON: writing %d\n", rb);
      write(1, buff, rb);
    }
  }

  return 0;
}