/* SPDX-License-Identifier: GPL-2.0 *//* * TTY core internal functions */ #ifndef _TTY_INTERNAL_H#define _TTY_INTERNAL_H #define tty_msg(fn, tty, f, ...) \	fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__) #define tty_debug(tty, f, ...)	tty_msg(pr_debug, tty, f, ##__VA_ARGS__)#define tty_notice(tty, f, ...)	tty_msg(pr_notice, tty, f, ##__VA_ARGS__)#define tty_warn(tty, f, ...)	tty_msg(pr_warn, tty, f, ##__VA_ARGS__)#define tty_err(tty, f, ...)	tty_msg(pr_err, tty, f, ##__VA_ARGS__) #define tty_info_ratelimited(tty, f, ...) \		tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__) /* * Lock subclasses for tty locks * * TTY_LOCK_NORMAL is for normal ttys and master ptys. * TTY_LOCK_SLAVE is for slave ptys only. * * Lock subclasses are necessary for handling nested locking with pty pairs. * tty locks which use nested locking: * * legacy_mutex - Nested tty locks are necessary for releasing pty pairs. *		  The stable lock order is master pty first, then slave pty. * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem. *		   Subclassing this lock enables the slave pty to hold its *		   termios_rwsem when claiming the master tty_buffer lock. * tty_buffer lock - slave ptys can claim nested buffer lock when handling *		     signal chars. The stable lock order is slave pty, then *		     master. */enum {	TTY_LOCK_NORMAL = 0,	TTY_LOCK_SLAVE,}; /* Values for tty->flow_change */enum tty_flow_change {	TTY_FLOW_NO_CHANGE,	TTY_THROTTLE_SAFE,	TTY_UNTHROTTLE_SAFE,}; static inline void __tty_set_flow_change(struct tty_struct *tty,					 enum tty_flow_change val){	tty->flow_change = val;} static inline void tty_set_flow_change(struct tty_struct *tty,				       enum tty_flow_change val){	tty->flow_change = val;	smp_mb();} int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);void tty_ldisc_unlock(struct tty_struct *tty); int __tty_check_change(struct tty_struct *tty, int sig);int tty_check_change(struct tty_struct *tty);void __stop_tty(struct tty_struct *tty);void __start_tty(struct tty_struct *tty);void tty_write_unlock(struct tty_struct *tty);int tty_write_lock(struct tty_struct *tty, bool ndelay);void tty_vhangup_session(struct tty_struct *tty);void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);int tty_signal_session_leader(struct tty_struct *tty, int exit_session);void session_clear_tty(struct pid *session);void tty_buffer_free_all(struct tty_port *port);void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);void tty_buffer_init(struct tty_port *port);void tty_buffer_set_lock_subclass(struct tty_port *port);bool tty_buffer_restart_work(struct tty_port *port);bool tty_buffer_cancel_work(struct tty_port *port);void tty_buffer_flush_work(struct tty_port *port);speed_t tty_termios_input_baud_rate(const struct ktermios *termios);void tty_ldisc_hangup(struct tty_struct *tty, bool reset);int tty_ldisc_reinit(struct tty_struct *tty, int disc);long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,		       struct file *file, unsigned int cmd, unsigned long arg);void tty_default_fops(struct file_operations *fops);struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);int tty_alloc_file(struct file *file);void tty_add_file(struct tty_struct *tty, struct file *file);void tty_free_file(struct file *file);int tty_release(struct inode *inode, struct file *filp); #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock)) int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);void tty_ldisc_release(struct tty_struct *tty);int __must_check tty_ldisc_init(struct tty_struct *tty);void tty_ldisc_deinit(struct tty_struct *tty); extern int tty_ldisc_autoload; /* tty_audit.c */#ifdef CONFIG_AUDITvoid tty_audit_add_data(const struct tty_struct *tty, const void *data,			size_t size);void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch);#elsestatic inline void tty_audit_add_data(const struct tty_struct *tty,				      const void *data, size_t size){}static inline void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch){}#endif ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *); int tty_insert_flip_string_and_push_buffer(struct tty_port *port,					   const u8 *chars, size_t cnt); #endif