okiockey
#define KIOCGETKEY _IOWR('k', 2, struct okiockey) /* fill in kio_entry */
static int kbd_oldkeymap(struct kbd_state *, u_long, struct okiockey *);
error = kbd_oldkeymap(ks, cmd, (struct okiockey *)data);
kbd_oldkeymap(struct kbd_state *ks, u_long cmd, struct okiockey *kio)
#define KIOCSETKEY _IOWR('k', 1, struct okiockey) /* fill in kio_entry */
#define KIOCGETKEY _IOWR('k', 2, struct okiockey) /* fill in kio_entry */