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114 lines
4.0 KiB
114 lines
4.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* TTY core internal functions |
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*/ |
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#ifndef _TTY_INTERNAL_H |
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#define _TTY_INTERNAL_H |
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#define tty_msg(fn, tty, f, ...) \ |
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fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__) |
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#define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__) |
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#define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__) |
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#define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__) |
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#define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__) |
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#define tty_info_ratelimited(tty, f, ...) \ |
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tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__) |
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/* |
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* Lock subclasses for tty locks |
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* |
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* TTY_LOCK_NORMAL is for normal ttys and master ptys. |
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* TTY_LOCK_SLAVE is for slave ptys only. |
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* |
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* Lock subclasses are necessary for handling nested locking with pty pairs. |
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* tty locks which use nested locking: |
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* |
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* legacy_mutex - Nested tty locks are necessary for releasing pty pairs. |
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* The stable lock order is master pty first, then slave pty. |
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* termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem. |
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* Subclassing this lock enables the slave pty to hold its |
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* termios_rwsem when claiming the master tty_buffer lock. |
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* tty_buffer lock - slave ptys can claim nested buffer lock when handling |
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* signal chars. The stable lock order is slave pty, then |
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* master. |
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*/ |
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enum { |
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TTY_LOCK_NORMAL = 0, |
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TTY_LOCK_SLAVE, |
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}; |
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/* Values for tty->flow_change */ |
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#define TTY_THROTTLE_SAFE 1 |
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#define TTY_UNTHROTTLE_SAFE 2 |
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static inline void __tty_set_flow_change(struct tty_struct *tty, int val) |
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{ |
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tty->flow_change = val; |
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} |
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static inline void tty_set_flow_change(struct tty_struct *tty, int val) |
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{ |
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tty->flow_change = val; |
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smp_mb(); |
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} |
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int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout); |
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void tty_ldisc_unlock(struct tty_struct *tty); |
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int __tty_check_change(struct tty_struct *tty, int sig); |
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int tty_check_change(struct tty_struct *tty); |
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void __stop_tty(struct tty_struct *tty); |
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void __start_tty(struct tty_struct *tty); |
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void tty_vhangup_session(struct tty_struct *tty); |
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void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty); |
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int tty_signal_session_leader(struct tty_struct *tty, int exit_session); |
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void session_clear_tty(struct pid *session); |
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void tty_buffer_free_all(struct tty_port *port); |
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void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld); |
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void tty_buffer_init(struct tty_port *port); |
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void tty_buffer_set_lock_subclass(struct tty_port *port); |
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bool tty_buffer_restart_work(struct tty_port *port); |
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bool tty_buffer_cancel_work(struct tty_port *port); |
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void tty_buffer_flush_work(struct tty_port *port); |
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speed_t tty_termios_input_baud_rate(struct ktermios *termios); |
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void tty_ldisc_hangup(struct tty_struct *tty, bool reset); |
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int tty_ldisc_reinit(struct tty_struct *tty, int disc); |
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long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
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long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty, |
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struct file *file, unsigned int cmd, unsigned long arg); |
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void tty_default_fops(struct file_operations *fops); |
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struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx); |
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int tty_alloc_file(struct file *file); |
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void tty_add_file(struct tty_struct *tty, struct file *file); |
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void tty_free_file(struct file *file); |
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int tty_release(struct inode *inode, struct file *filp); |
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#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
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int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
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void tty_ldisc_release(struct tty_struct *tty); |
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int __must_check tty_ldisc_init(struct tty_struct *tty); |
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void tty_ldisc_deinit(struct tty_struct *tty); |
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void tty_sysctl_init(void); |
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/* tty_audit.c */ |
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#ifdef CONFIG_AUDIT |
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void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size); |
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void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
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#else |
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static inline void tty_audit_add_data(struct tty_struct *tty, const void *data, |
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size_t size) |
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{ |
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} |
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static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
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{ |
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} |
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#endif |
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ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *); |
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#endif
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