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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | /* 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_AUDIT void 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); #else static 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 |