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And make an explicit constant for zero too. This allows for easier type checking of the parameter. Note: tty_struct::flow_change is kept as int because include/tty.h (tty_struct) doesn't see tty/tty.h (this enum). Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230919085156.1578-13-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/* 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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enum tty_flow_change {
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TTY_FLOW_NO_CHANGE,
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TTY_THROTTLE_SAFE,
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TTY_UNTHROTTLE_SAFE,
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};
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static inline void __tty_set_flow_change(struct tty_struct *tty,
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enum tty_flow_change 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,
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enum tty_flow_change 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_write_unlock(struct tty_struct *tty);
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int tty_write_lock(struct tty_struct *tty, bool ndelay);
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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(const 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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extern int tty_ldisc_autoload;
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/* tty_audit.c */
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#ifdef CONFIG_AUDIT
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void tty_audit_add_data(const struct tty_struct *tty, const void *data,
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size_t size);
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void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch);
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#else
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static inline void tty_audit_add_data(const struct tty_struct *tty,
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const void *data, size_t size)
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{
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}
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static inline void tty_audit_tiocsti(const struct tty_struct *tty, u8 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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int tty_insert_flip_string_and_push_buffer(struct tty_port *port,
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const u8 *chars, size_t cnt);
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#endif
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