static int r_read (RSFD rfd, void *buf);
static int r_write (RSFD rfd, const void *buf);
static int r_score (RSFD rfd, int *score);
static int r_read (RSFD rfd, void *buf);
static int r_write (RSFD rfd, const void *buf);
static int r_score (RSFD rfd, int *score);