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