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]);
   }