rdr_private_func_t
rdr_private_func_t private_func_data;
*buf_size = sizeof (rdr_private_func_t);
(void) memcpy(bufptr, &private_func_data, sizeof (rdr_private_func_t));
bufptr += sizeof (rdr_private_func_t);
rdr_private_func_t private_func_data;
(void) memcpy(&private_func_data, bufptr, sizeof (rdr_private_func_t));
bufptr += sizeof (rdr_private_func_t);
rdr_private_func_t private_func;