#define IO_NOWAIT 0
#define IO_WAIT 1
-extern struct iop *io_open(int, int, int, int (*)(void), s_char *);
+extern struct iop *io_open(int, int, int);
extern void io_init(void);
extern int io_noblocking(struct iop *, int);
extern void io_close(struct iop *);