static void gs_break(struct tty_struct *tty, int break_state);
static int gs_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
static void gs_break(struct tty_struct *tty, int break_state);
static int gs_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);