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9f72cab159
The flow change and restricted_tty_write() logic is internal to the tty core only, so move it out of the include/linux/tty.h file. Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-12-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
77 lines
2.2 KiB
C
77 lines
2.2 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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#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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/* 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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