else { /* In the parent */
      /* close unneeded endpoints */
      close(reader[1]);
      close(writer[0]);
      /* Send something to the filter */
      write(writer[1], msg, strlen(msg));
      close(writer[1]);   /* HERE I CLOSE PARENT->FILTER */
      /* Read response from the filter */
      printf("filter says:\n");
      while ((nread = read(reader[0], buf, 9)) > 0) {
         buf[nread] = '\x0';
         printf("%s", buf);
      }
      if (nread < 0) {
         perror("read(): ");
         return 1;
      }
      printf("\n");
      close(reader[0]);  /* HERE I CLOSE FILTER->PARENT */
   }

##</code><code>##

   else { /* In the parent */
      /* close unneeded endpoints */
      close(reader[1]);
      close(writer[0]);

      while (msg = next_string_to_filter()) {
         /* Send something to the filter */
         write(writer[1], msg, strlen(msg));

         /* Read response from the filter */
         read_and_consume_answer(reader[0]);
      }

      /* Close communication with filter */
      close(writer[1]);
      close(reader[0]);
   }