5 #include <linux/major.h>
6 #include <linux/termios.h>
7 #include <linux/workqueue.h>
8 #include <linux/tty_driver.h>
9 #include <linux/tty_ldisc.h>
10 #include <linux/mutex.h>
11 #include <linux/tty_flags.h>
12 #include <uapi/linux/tty.h>
13 #include <linux/rwsem.h>
14 #include <linux/llist.h>
18 * Lock subclasses for tty locks
20 * TTY_LOCK_NORMAL is for normal ttys and master ptys.
21 * TTY_LOCK_SLAVE is for slave ptys only.
23 * Lock subclasses are necessary for handling nested locking with pty pairs.
24 * tty locks which use nested locking:
26 * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
27 * The stable lock order is master pty first, then slave pty.
28 * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
29 * Subclassing this lock enables the slave pty to hold its
30 * termios_rwsem when claiming the master tty_buffer lock.
31 * tty_buffer lock - slave ptys can claim nested buffer lock when handling
32 * signal chars. The stable lock order is slave pty, then
42 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
43 * hardcoded at present.)
45 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
46 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
47 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
50 * This character is the same as _POSIX_VDISABLE: it cannot be used as
51 * a c_cc[] character, but indicates that a particular special character
52 * isn't in use (eg VINTR has no character etc)
54 #define __DISABLED_CHAR '\0'
58 struct tty_buffer
*next
;
59 struct llist_node free
;
66 /* Data points here */
67 unsigned long data
[0];
70 /* Values for .flags field of tty_buffer */
71 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
73 static inline unsigned char *char_buf_ptr(struct tty_buffer
*b
, int ofs
)
75 return ((unsigned char *)b
->data
) + ofs
;
78 static inline char *flag_buf_ptr(struct tty_buffer
*b
, int ofs
)
80 return (char *)char_buf_ptr(b
, ofs
) + b
->size
;
84 struct tty_buffer
*head
; /* Queue head */
85 struct work_struct work
;
88 struct tty_buffer sentinel
;
89 struct llist_head free
; /* Free queue head */
90 atomic_t mem_used
; /* In-use buffers excluding free list */
92 struct tty_buffer
*tail
; /* Active buffer */
95 * When a break, frame error, or parity error happens, these codes are
96 * stuffed into the flags buffer.
102 #define TTY_OVERRUN 4
104 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
105 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
106 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
107 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
108 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
109 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
110 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
111 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
112 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
113 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
114 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
115 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
116 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
117 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
118 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
119 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
120 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
122 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
123 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
124 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
125 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
127 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
128 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
129 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
130 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
131 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
132 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
133 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
134 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
135 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
136 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
137 #define I_IXON(tty) _I_FLAG((tty), IXON)
138 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
139 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
140 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
141 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
143 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
144 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
145 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
146 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
147 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
148 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
149 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
150 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
151 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
152 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
153 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
154 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
155 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
156 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
158 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
159 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
160 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
161 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
162 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
163 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
164 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
165 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
166 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
167 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
168 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
170 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
171 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
172 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
173 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
174 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
175 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
176 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
177 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
178 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
179 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
180 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
181 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
182 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
183 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
184 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
185 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
188 struct signal_struct
;
191 * Port level information. Each device keeps its own port level information
192 * so provide a common structure for those ports wanting to use common support
195 * The tty port has a different lifetime to the tty so must be kept apart.
196 * In addition be careful as tty -> port mappings are valid for the life
197 * of the tty object but in many cases port -> tty mappings are valid only
198 * until a hangup so don't use the wrong path.
203 struct tty_port_operations
{
204 /* Return 1 if the carrier is raised */
205 int (*carrier_raised
)(struct tty_port
*port
);
206 /* Control the DTR line */
207 void (*dtr_rts
)(struct tty_port
*port
, int raise
);
208 /* Called when the last close completes or a hangup finishes
209 IFF the port was initialized. Do not use to free resources. Called
210 under the port mutex to serialize against activate/shutdowns */
211 void (*shutdown
)(struct tty_port
*port
);
212 /* Called under the port mutex from tty_port_open, serialized using
214 /* FIXME: long term getting the tty argument *out* of this would be
216 int (*activate
)(struct tty_port
*port
, struct tty_struct
*tty
);
217 /* Called on the final put of a port */
218 void (*destruct
)(struct tty_port
*port
);
222 struct tty_bufhead buf
; /* Locked internally */
223 struct tty_struct
*tty
; /* Back pointer */
224 struct tty_struct
*itty
; /* internal back ptr */
225 const struct tty_port_operations
*ops
; /* Port operations */
226 spinlock_t lock
; /* Lock protecting tty field */
227 int blocked_open
; /* Waiting to open */
228 int count
; /* Usage count */
229 wait_queue_head_t open_wait
; /* Open waiters */
230 wait_queue_head_t close_wait
; /* Close waiters */
231 wait_queue_head_t delta_msr_wait
; /* Modem status change */
232 unsigned long flags
; /* TTY flags ASY_*/
233 unsigned char console
:1, /* port is a console */
234 low_latency
:1; /* optional: tune for latency */
235 struct mutex mutex
; /* Locking */
236 struct mutex buf_mutex
; /* Buffer alloc lock */
237 unsigned char *xmit_buf
; /* Optional buffer */
238 unsigned int close_delay
; /* Close port delay */
239 unsigned int closing_wait
; /* Delay for output */
240 int drain_delay
; /* Set to zero if no pure time
241 based drain is needed else
242 set to size of fifo */
243 struct kref kref
; /* Ref counter */
247 * Where all of the state associated with a tty is kept while the tty
248 * is open. Since the termios state should be kept even if the tty
249 * has been closed --- for things like the baud rate, etc --- it is
250 * not stored here, but rather a pointer to the real state is stored
251 * here. Possible the winsize structure should have the same
252 * treatment, but (1) the default 80x24 is usually right and (2) it's
253 * most often used by a windowing system, which will set the correct
254 * size each time the window is created or resized anyway.
258 struct tty_operations
;
264 struct tty_driver
*driver
;
265 const struct tty_operations
*ops
;
268 /* Protects ldisc changes: Lock tty not pty */
269 struct ld_semaphore ldisc_sem
;
270 struct tty_ldisc
*ldisc
;
272 struct mutex atomic_write_lock
;
273 struct mutex legacy_mutex
;
274 struct mutex throttle_mutex
;
275 struct rw_semaphore termios_rwsem
;
276 struct mutex winsize_mutex
;
277 spinlock_t ctrl_lock
;
278 spinlock_t flow_lock
;
279 /* Termios values are protected by the termios rwsem */
280 struct ktermios termios
, termios_locked
;
281 struct termiox
*termiox
; /* May be NULL for unsupported */
283 struct pid
*pgrp
; /* Protected by ctrl lock */
287 struct winsize winsize
; /* winsize_mutex */
288 unsigned long stopped
:1, /* flow_lock */
290 unused
:BITS_PER_LONG
- 2;
292 unsigned long ctrl_status
:8, /* ctrl_lock */
294 unused_ctrl
:BITS_PER_LONG
- 9;
295 unsigned int receive_room
; /* Bytes free for queue */
298 struct tty_struct
*link
;
299 struct fasync_struct
*fasync
;
300 int alt_speed
; /* For magic substitution of 38400 bps */
301 wait_queue_head_t write_wait
;
302 wait_queue_head_t read_wait
;
303 struct work_struct hangup_work
;
306 struct list_head tty_files
;
308 #define N_TTY_BUF_SIZE 4096
311 unsigned char *write_buf
;
313 /* If the tty has a pending do_SAK, queue it here - akpm */
314 struct work_struct SAK_work
;
315 struct tty_port
*port
;
318 /* Each of a tty's open files has private_data pointing to tty_file_private */
319 struct tty_file_private
{
320 struct tty_struct
*tty
;
322 struct list_head list
;
325 /* tty magic number */
326 #define TTY_MAGIC 0x5401
329 * These bits are used in the flags field of the tty structure.
331 * So that interrupts won't be able to mess up the queues,
332 * copy_to_cooked must be atomic with respect to itself, as must
333 * tty->write. Thus, you must use the inline functions set_bit() and
334 * clear_bit() to make things atomic.
336 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
337 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
338 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
339 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
340 #define TTY_DEBUG 4 /* Debugging */
341 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
342 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
343 #define TTY_PTY_LOCK 16 /* pty private */
344 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
345 #define TTY_HUPPED 18 /* Post driver->hangup() */
346 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
348 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
350 /* Values for tty->flow_change */
351 #define TTY_THROTTLE_SAFE 1
352 #define TTY_UNTHROTTLE_SAFE 2
354 static inline void __tty_set_flow_change(struct tty_struct
*tty
, int val
)
356 tty
->flow_change
= val
;
359 static inline void tty_set_flow_change(struct tty_struct
*tty
, int val
)
361 tty
->flow_change
= val
;
366 extern void console_init(void);
367 extern void tty_kref_put(struct tty_struct
*tty
);
368 extern struct pid
*tty_get_pgrp(struct tty_struct
*tty
);
369 extern void tty_vhangup_self(void);
370 extern void disassociate_ctty(int priv
);
371 extern dev_t
tty_devnum(struct tty_struct
*tty
);
372 extern void proc_clear_tty(struct task_struct
*p
);
373 extern struct tty_struct
*get_current_tty(void);
375 extern int __init
tty_init(void);
377 static inline void console_init(void)
379 static inline void tty_kref_put(struct tty_struct
*tty
)
381 static inline struct pid
*tty_get_pgrp(struct tty_struct
*tty
)
383 static inline void tty_vhangup_self(void)
385 static inline void disassociate_ctty(int priv
)
387 static inline dev_t
tty_devnum(struct tty_struct
*tty
)
389 static inline void proc_clear_tty(struct task_struct
*p
)
391 static inline struct tty_struct
*get_current_tty(void)
394 static inline int __init
tty_init(void)
398 extern void tty_write_flush(struct tty_struct
*);
400 extern struct ktermios tty_std_termios
;
402 extern int vcs_init(void);
404 extern struct class *tty_class
;
407 * tty_kref_get - get a tty reference
410 * Return a new reference to a tty object. The caller must hold
411 * sufficient locks/counts to ensure that their existing reference cannot
415 static inline struct tty_struct
*tty_kref_get(struct tty_struct
*tty
)
418 kref_get(&tty
->kref
);
422 extern int tty_paranoia_check(struct tty_struct
*tty
, struct inode
*inode
,
423 const char *routine
);
424 extern char *tty_name(struct tty_struct
*tty
, char *buf
);
425 extern void tty_wait_until_sent(struct tty_struct
*tty
, long timeout
);
426 extern int tty_check_change(struct tty_struct
*tty
);
427 extern void __stop_tty(struct tty_struct
*tty
);
428 extern void stop_tty(struct tty_struct
*tty
);
429 extern void __start_tty(struct tty_struct
*tty
);
430 extern void start_tty(struct tty_struct
*tty
);
431 extern int tty_register_driver(struct tty_driver
*driver
);
432 extern int tty_unregister_driver(struct tty_driver
*driver
);
433 extern struct device
*tty_register_device(struct tty_driver
*driver
,
434 unsigned index
, struct device
*dev
);
435 extern struct device
*tty_register_device_attr(struct tty_driver
*driver
,
436 unsigned index
, struct device
*device
,
438 const struct attribute_group
**attr_grp
);
439 extern void tty_unregister_device(struct tty_driver
*driver
, unsigned index
);
440 extern int tty_read_raw_data(struct tty_struct
*tty
, unsigned char *bufp
,
442 extern void tty_write_message(struct tty_struct
*tty
, char *msg
);
443 extern int tty_send_xchar(struct tty_struct
*tty
, char ch
);
444 extern int tty_put_char(struct tty_struct
*tty
, unsigned char c
);
445 extern int tty_chars_in_buffer(struct tty_struct
*tty
);
446 extern int tty_write_room(struct tty_struct
*tty
);
447 extern void tty_driver_flush_buffer(struct tty_struct
*tty
);
448 extern void tty_throttle(struct tty_struct
*tty
);
449 extern void tty_unthrottle(struct tty_struct
*tty
);
450 extern int tty_throttle_safe(struct tty_struct
*tty
);
451 extern int tty_unthrottle_safe(struct tty_struct
*tty
);
452 extern int tty_do_resize(struct tty_struct
*tty
, struct winsize
*ws
);
453 extern void tty_driver_remove_tty(struct tty_driver
*driver
,
454 struct tty_struct
*tty
);
455 extern void tty_free_termios(struct tty_struct
*tty
);
456 extern int is_current_pgrp_orphaned(void);
457 extern int is_ignored(int sig
);
458 extern int tty_signal(int sig
, struct tty_struct
*tty
);
459 extern void tty_hangup(struct tty_struct
*tty
);
460 extern void tty_vhangup(struct tty_struct
*tty
);
461 extern int tty_hung_up_p(struct file
*filp
);
462 extern void do_SAK(struct tty_struct
*tty
);
463 extern void __do_SAK(struct tty_struct
*tty
);
464 extern void no_tty(void);
465 extern void tty_flush_to_ldisc(struct tty_struct
*tty
);
466 extern void tty_buffer_free_all(struct tty_port
*port
);
467 extern void tty_buffer_flush(struct tty_struct
*tty
, struct tty_ldisc
*ld
);
468 extern void tty_buffer_init(struct tty_port
*port
);
469 extern void tty_buffer_set_lock_subclass(struct tty_port
*port
);
470 extern speed_t
tty_termios_baud_rate(struct ktermios
*termios
);
471 extern speed_t
tty_termios_input_baud_rate(struct ktermios
*termios
);
472 extern void tty_termios_encode_baud_rate(struct ktermios
*termios
,
473 speed_t ibaud
, speed_t obaud
);
474 extern void tty_encode_baud_rate(struct tty_struct
*tty
,
475 speed_t ibaud
, speed_t obaud
);
478 * tty_get_baud_rate - get tty bit rates
481 * Returns the baud rate as an integer for this terminal. The
482 * termios lock must be held by the caller and the terminal bit
483 * flags may be updated.
487 static inline speed_t
tty_get_baud_rate(struct tty_struct
*tty
)
489 return tty_termios_baud_rate(&tty
->termios
);
492 extern void tty_termios_copy_hw(struct ktermios
*new, struct ktermios
*old
);
493 extern int tty_termios_hw_change(struct ktermios
*a
, struct ktermios
*b
);
495 extern struct tty_ldisc
*tty_ldisc_ref(struct tty_struct
*);
496 extern void tty_ldisc_deref(struct tty_ldisc
*);
497 extern struct tty_ldisc
*tty_ldisc_ref_wait(struct tty_struct
*);
498 extern void tty_ldisc_hangup(struct tty_struct
*tty
);
499 extern const struct file_operations tty_ldiscs_proc_fops
;
501 extern void tty_wakeup(struct tty_struct
*tty
);
502 extern void tty_ldisc_flush(struct tty_struct
*tty
);
504 extern long tty_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
505 extern int tty_mode_ioctl(struct tty_struct
*tty
, struct file
*file
,
506 unsigned int cmd
, unsigned long arg
);
507 extern int tty_perform_flush(struct tty_struct
*tty
, unsigned long arg
);
508 extern void tty_default_fops(struct file_operations
*fops
);
509 extern struct tty_struct
*alloc_tty_struct(struct tty_driver
*driver
, int idx
);
510 extern int tty_alloc_file(struct file
*file
);
511 extern void tty_add_file(struct tty_struct
*tty
, struct file
*file
);
512 extern void tty_free_file(struct file
*file
);
513 extern void free_tty_struct(struct tty_struct
*tty
);
514 extern void deinitialize_tty_struct(struct tty_struct
*tty
);
515 extern struct tty_struct
*tty_init_dev(struct tty_driver
*driver
, int idx
);
516 extern int tty_release(struct inode
*inode
, struct file
*filp
);
517 extern int tty_init_termios(struct tty_struct
*tty
);
518 extern int tty_standard_install(struct tty_driver
*driver
,
519 struct tty_struct
*tty
);
521 extern struct mutex tty_mutex
;
522 extern spinlock_t tty_files_lock
;
524 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
526 extern void tty_port_init(struct tty_port
*port
);
527 extern void tty_port_link_device(struct tty_port
*port
,
528 struct tty_driver
*driver
, unsigned index
);
529 extern struct device
*tty_port_register_device(struct tty_port
*port
,
530 struct tty_driver
*driver
, unsigned index
,
531 struct device
*device
);
532 extern struct device
*tty_port_register_device_attr(struct tty_port
*port
,
533 struct tty_driver
*driver
, unsigned index
,
534 struct device
*device
, void *drvdata
,
535 const struct attribute_group
**attr_grp
);
536 extern int tty_port_alloc_xmit_buf(struct tty_port
*port
);
537 extern void tty_port_free_xmit_buf(struct tty_port
*port
);
538 extern void tty_port_destroy(struct tty_port
*port
);
539 extern void tty_port_put(struct tty_port
*port
);
541 static inline struct tty_port
*tty_port_get(struct tty_port
*port
)
543 if (port
&& kref_get_unless_zero(&port
->kref
))
548 /* If the cts flow control is enabled, return true. */
549 static inline bool tty_port_cts_enabled(struct tty_port
*port
)
551 return port
->flags
& ASYNC_CTS_FLOW
;
554 extern struct tty_struct
*tty_port_tty_get(struct tty_port
*port
);
555 extern void tty_port_tty_set(struct tty_port
*port
, struct tty_struct
*tty
);
556 extern int tty_port_carrier_raised(struct tty_port
*port
);
557 extern void tty_port_raise_dtr_rts(struct tty_port
*port
);
558 extern void tty_port_lower_dtr_rts(struct tty_port
*port
);
559 extern void tty_port_hangup(struct tty_port
*port
);
560 extern void tty_port_tty_hangup(struct tty_port
*port
, bool check_clocal
);
561 extern void tty_port_tty_wakeup(struct tty_port
*port
);
562 extern int tty_port_block_til_ready(struct tty_port
*port
,
563 struct tty_struct
*tty
, struct file
*filp
);
564 extern int tty_port_close_start(struct tty_port
*port
,
565 struct tty_struct
*tty
, struct file
*filp
);
566 extern void tty_port_close_end(struct tty_port
*port
, struct tty_struct
*tty
);
567 extern void tty_port_close(struct tty_port
*port
,
568 struct tty_struct
*tty
, struct file
*filp
);
569 extern int tty_port_install(struct tty_port
*port
, struct tty_driver
*driver
,
570 struct tty_struct
*tty
);
571 extern int tty_port_open(struct tty_port
*port
,
572 struct tty_struct
*tty
, struct file
*filp
);
573 static inline int tty_port_users(struct tty_port
*port
)
575 return port
->count
+ port
->blocked_open
;
578 extern int tty_register_ldisc(int disc
, struct tty_ldisc_ops
*new_ldisc
);
579 extern int tty_unregister_ldisc(int disc
);
580 extern int tty_set_ldisc(struct tty_struct
*tty
, int ldisc
);
581 extern int tty_ldisc_setup(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
582 extern void tty_ldisc_release(struct tty_struct
*tty
);
583 extern void tty_ldisc_init(struct tty_struct
*tty
);
584 extern void tty_ldisc_deinit(struct tty_struct
*tty
);
585 extern void tty_ldisc_begin(void);
587 static inline int tty_ldisc_receive_buf(struct tty_ldisc
*ld
, unsigned char *p
,
590 if (ld
->ops
->receive_buf2
)
591 count
= ld
->ops
->receive_buf2(ld
->tty
, p
, f
, count
);
593 count
= min_t(int, count
, ld
->tty
->receive_room
);
595 ld
->ops
->receive_buf(ld
->tty
, p
, f
, count
);
602 extern struct tty_ldisc_ops tty_ldisc_N_TTY
;
603 extern void n_tty_inherit_ops(struct tty_ldisc_ops
*ops
);
607 extern void tty_audit_add_data(struct tty_struct
*tty
, unsigned char *data
,
608 size_t size
, unsigned icanon
);
609 extern void tty_audit_exit(void);
610 extern void tty_audit_fork(struct signal_struct
*sig
);
611 extern void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
);
612 extern void tty_audit_push(struct tty_struct
*tty
);
613 extern int tty_audit_push_current(void);
615 static inline void tty_audit_add_data(struct tty_struct
*tty
,
616 unsigned char *data
, size_t size
, unsigned icanon
)
619 static inline void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
)
622 static inline void tty_audit_exit(void)
625 static inline void tty_audit_fork(struct signal_struct
*sig
)
628 static inline void tty_audit_push(struct tty_struct
*tty
)
631 static inline int tty_audit_push_current(void)
638 extern int n_tty_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
639 unsigned int cmd
, unsigned long arg
);
640 extern long n_tty_compat_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
641 unsigned int cmd
, unsigned long arg
);
645 extern int vt_ioctl(struct tty_struct
*tty
,
646 unsigned int cmd
, unsigned long arg
);
648 extern long vt_compat_ioctl(struct tty_struct
*tty
,
649 unsigned int cmd
, unsigned long arg
);
652 /* functions for preparation of BKL removal */
653 extern void __lockfunc
tty_lock(struct tty_struct
*tty
);
654 extern void __lockfunc
tty_unlock(struct tty_struct
*tty
);
655 extern void __lockfunc
tty_lock_slave(struct tty_struct
*tty
);
656 extern void __lockfunc
tty_unlock_slave(struct tty_struct
*tty
);
657 extern void tty_set_lock_subclass(struct tty_struct
*tty
);
659 * this shall be called only from where BTM is held (like close)
661 * We need this to ensure nobody waits for us to finish while we are waiting.
662 * Without this we were encountering system stalls.
664 * This should be indeed removed with BTM removal later.
666 * Locking: BTM required. Nobody is allowed to hold port->mutex.
668 static inline void tty_wait_until_sent_from_close(struct tty_struct
*tty
,
671 tty_unlock(tty
); /* tty->ops->close holds the BTM, drop it while waiting */
672 tty_wait_until_sent(tty
, timeout
);
677 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
679 * The condition we are waiting for might take a long time to
680 * become true, or might depend on another thread taking the
681 * BTM. In either case, we need to drop the BTM to guarantee
682 * forward progress. This is a leftover from the conversion
683 * from the BKL and should eventually get removed as the BTM
686 * Do not use in new code.
688 #define wait_event_interruptible_tty(tty, wq, condition) \
692 __ret = __wait_event_interruptible_tty(tty, wq, \
697 #define __wait_event_interruptible_tty(tty, wq, condition) \
698 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
703 #ifdef CONFIG_PROC_FS
704 extern void proc_tty_register_driver(struct tty_driver
*);
705 extern void proc_tty_unregister_driver(struct tty_driver
*);
707 static inline void proc_tty_register_driver(struct tty_driver
*d
) {}
708 static inline void proc_tty_unregister_driver(struct tty_driver
*d
) {}