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/* 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,
};
int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
void tty_ldisc_unlock(struct tty_struct *tty);
/* tty_audit.c */
#ifdef CONFIG_AUDIT
void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size);
void tty_audit_tiocsti(struct tty_struct *tty, char ch);
#else
static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
size_t size)
{
}
static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
{
}
#endif
#endif
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