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>
19 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
20 * hardcoded at present.)
22 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
23 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
24 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
27 * This character is the same as _POSIX_VDISABLE: it cannot be used as
28 * a c_cc[] character, but indicates that a particular special character
29 * isn't in use (eg VINTR has no character etc)
31 #define __DISABLED_CHAR '\0'
35 struct tty_buffer
*next
;
36 struct llist_node free
;
42 /* Data points here */
43 unsigned long data
[0];
46 static inline unsigned char *char_buf_ptr(struct tty_buffer
*b
, int ofs
)
48 return ((unsigned char *)b
->data
) + ofs
;
51 static inline char *flag_buf_ptr(struct tty_buffer
*b
, int ofs
)
53 return (char *)char_buf_ptr(b
, ofs
) + b
->size
;
57 struct tty_buffer
*head
; /* Queue head */
58 struct work_struct work
;
61 struct tty_buffer sentinel
;
62 struct llist_head free
; /* Free queue head */
63 atomic_t memory_used
; /* In-use buffers excluding free list */
64 struct tty_buffer
*tail
; /* Active buffer */
67 * When a break, frame error, or parity error happens, these codes are
68 * stuffed into the flags buffer.
76 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
77 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
78 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
79 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
80 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
81 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
82 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
83 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
84 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
85 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
86 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
87 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
88 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
89 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
90 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
91 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
92 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
94 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
95 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
96 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
97 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
99 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
100 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
101 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
102 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
103 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
104 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
105 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
106 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
107 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
108 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
109 #define I_IXON(tty) _I_FLAG((tty), IXON)
110 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
111 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
112 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
113 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
115 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
116 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
117 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
118 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
119 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
120 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
121 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
122 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
123 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
124 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
125 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
126 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
127 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
128 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
130 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
131 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
132 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
133 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
134 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
135 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
136 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
137 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
138 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
139 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
141 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
142 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
143 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
144 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
145 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
146 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
147 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
148 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
149 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
150 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
151 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
152 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
153 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
154 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
155 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
156 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
159 struct signal_struct
;
162 * Port level information. Each device keeps its own port level information
163 * so provide a common structure for those ports wanting to use common support
166 * The tty port has a different lifetime to the tty so must be kept apart.
167 * In addition be careful as tty -> port mappings are valid for the life
168 * of the tty object but in many cases port -> tty mappings are valid only
169 * until a hangup so don't use the wrong path.
174 struct tty_port_operations
{
175 /* Return 1 if the carrier is raised */
176 int (*carrier_raised
)(struct tty_port
*port
);
177 /* Control the DTR line */
178 void (*dtr_rts
)(struct tty_port
*port
, int raise
);
179 /* Called when the last close completes or a hangup finishes
180 IFF the port was initialized. Do not use to free resources. Called
181 under the port mutex to serialize against activate/shutdowns */
182 void (*shutdown
)(struct tty_port
*port
);
183 /* Called under the port mutex from tty_port_open, serialized using
185 /* FIXME: long term getting the tty argument *out* of this would be
187 int (*activate
)(struct tty_port
*port
, struct tty_struct
*tty
);
188 /* Called on the final put of a port */
189 void (*destruct
)(struct tty_port
*port
);
193 struct tty_bufhead buf
; /* Locked internally */
194 struct tty_struct
*tty
; /* Back pointer */
195 struct tty_struct
*itty
; /* internal back ptr */
196 const struct tty_port_operations
*ops
; /* Port operations */
197 spinlock_t lock
; /* Lock protecting tty field */
198 int blocked_open
; /* Waiting to open */
199 int count
; /* Usage count */
200 wait_queue_head_t open_wait
; /* Open waiters */
201 wait_queue_head_t close_wait
; /* Close waiters */
202 wait_queue_head_t delta_msr_wait
; /* Modem status change */
203 unsigned long flags
; /* TTY flags ASY_*/
204 unsigned char console
:1, /* port is a console */
205 low_latency
:1; /* direct buffer flush */
206 struct mutex mutex
; /* Locking */
207 struct mutex buf_mutex
; /* Buffer alloc lock */
208 unsigned char *xmit_buf
; /* Optional buffer */
209 unsigned int close_delay
; /* Close port delay */
210 unsigned int closing_wait
; /* Delay for output */
211 int drain_delay
; /* Set to zero if no pure time
212 based drain is needed else
213 set to size of fifo */
214 struct kref kref
; /* Ref counter */
218 * Where all of the state associated with a tty is kept while the tty
219 * is open. Since the termios state should be kept even if the tty
220 * has been closed --- for things like the baud rate, etc --- it is
221 * not stored here, but rather a pointer to the real state is stored
222 * here. Possible the winsize structure should have the same
223 * treatment, but (1) the default 80x24 is usually right and (2) it's
224 * most often used by a windowing system, which will set the correct
225 * size each time the window is created or resized anyway.
229 struct tty_operations
;
235 struct tty_driver
*driver
;
236 const struct tty_operations
*ops
;
239 /* Protects ldisc changes: Lock tty not pty */
240 struct ld_semaphore ldisc_sem
;
241 struct tty_ldisc
*ldisc
;
243 struct mutex atomic_write_lock
;
244 struct mutex legacy_mutex
;
245 struct mutex throttle_mutex
;
246 struct rw_semaphore termios_rwsem
;
247 struct mutex winsize_mutex
;
248 spinlock_t ctrl_lock
;
249 /* Termios values are protected by the termios rwsem */
250 struct ktermios termios
, termios_locked
;
251 struct termiox
*termiox
; /* May be NULL for unsupported */
253 struct pid
*pgrp
; /* Protected by ctrl lock */
257 struct winsize winsize
; /* winsize_mutex */
258 unsigned char stopped
:1, hw_stopped
:1, flow_stopped
:1, packet
:1;
259 unsigned char ctrl_status
; /* ctrl_lock */
260 unsigned int receive_room
; /* Bytes free for queue */
263 struct tty_struct
*link
;
264 struct fasync_struct
*fasync
;
265 int alt_speed
; /* For magic substitution of 38400 bps */
266 wait_queue_head_t write_wait
;
267 wait_queue_head_t read_wait
;
268 struct work_struct hangup_work
;
271 struct list_head tty_files
;
273 #define N_TTY_BUF_SIZE 4096
275 unsigned char closing
:1;
276 unsigned char *write_buf
;
278 /* If the tty has a pending do_SAK, queue it here - akpm */
279 struct work_struct SAK_work
;
280 struct tty_port
*port
;
283 /* Each of a tty's open files has private_data pointing to tty_file_private */
284 struct tty_file_private
{
285 struct tty_struct
*tty
;
287 struct list_head list
;
290 /* tty magic number */
291 #define TTY_MAGIC 0x5401
294 * These bits are used in the flags field of the tty structure.
296 * So that interrupts won't be able to mess up the queues,
297 * copy_to_cooked must be atomic with respect to itself, as must
298 * tty->write. Thus, you must use the inline functions set_bit() and
299 * clear_bit() to make things atomic.
301 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
302 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
303 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
304 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
305 #define TTY_DEBUG 4 /* Debugging */
306 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
307 #define TTY_CLOSING 7 /* ->close() in progress */
308 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
309 #define TTY_PTY_LOCK 16 /* pty private */
310 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
311 #define TTY_HUPPED 18 /* Post driver->hangup() */
312 #define TTY_HUPPING 21 /* ->hangup() in progress */
313 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
315 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
317 /* Values for tty->flow_change */
318 #define TTY_THROTTLE_SAFE 1
319 #define TTY_UNTHROTTLE_SAFE 2
321 static inline void __tty_set_flow_change(struct tty_struct
*tty
, int val
)
323 tty
->flow_change
= val
;
326 static inline void tty_set_flow_change(struct tty_struct
*tty
, int val
)
328 tty
->flow_change
= val
;
333 extern void console_init(void);
334 extern void tty_kref_put(struct tty_struct
*tty
);
335 extern struct pid
*tty_get_pgrp(struct tty_struct
*tty
);
336 extern void tty_vhangup_self(void);
337 extern void disassociate_ctty(int priv
);
338 extern dev_t
tty_devnum(struct tty_struct
*tty
);
339 extern void proc_clear_tty(struct task_struct
*p
);
340 extern struct tty_struct
*get_current_tty(void);
342 extern int __init
tty_init(void);
344 static inline void console_init(void)
346 static inline void tty_kref_put(struct tty_struct
*tty
)
348 static inline struct pid
*tty_get_pgrp(struct tty_struct
*tty
)
350 static inline void tty_vhangup_self(void)
352 static inline void disassociate_ctty(int priv
)
354 static inline dev_t
tty_devnum(struct tty_struct
*tty
)
356 static inline void proc_clear_tty(struct task_struct
*p
)
358 static inline struct tty_struct
*get_current_tty(void)
361 static inline int __init
tty_init(void)
365 extern void tty_write_flush(struct tty_struct
*);
367 extern struct ktermios tty_std_termios
;
369 extern int vcs_init(void);
371 extern struct class *tty_class
;
374 * tty_kref_get - get a tty reference
377 * Return a new reference to a tty object. The caller must hold
378 * sufficient locks/counts to ensure that their existing reference cannot
382 static inline struct tty_struct
*tty_kref_get(struct tty_struct
*tty
)
385 kref_get(&tty
->kref
);
389 extern int tty_paranoia_check(struct tty_struct
*tty
, struct inode
*inode
,
390 const char *routine
);
391 extern char *tty_name(struct tty_struct
*tty
, char *buf
);
392 extern void tty_wait_until_sent(struct tty_struct
*tty
, long timeout
);
393 extern int tty_check_change(struct tty_struct
*tty
);
394 extern void stop_tty(struct tty_struct
*tty
);
395 extern void start_tty(struct tty_struct
*tty
);
396 extern int tty_register_driver(struct tty_driver
*driver
);
397 extern int tty_unregister_driver(struct tty_driver
*driver
);
398 extern struct device
*tty_register_device(struct tty_driver
*driver
,
399 unsigned index
, struct device
*dev
);
400 extern struct device
*tty_register_device_attr(struct tty_driver
*driver
,
401 unsigned index
, struct device
*device
,
403 const struct attribute_group
**attr_grp
);
404 extern void tty_unregister_device(struct tty_driver
*driver
, unsigned index
);
405 extern int tty_read_raw_data(struct tty_struct
*tty
, unsigned char *bufp
,
407 extern void tty_write_message(struct tty_struct
*tty
, char *msg
);
408 extern int tty_put_char(struct tty_struct
*tty
, unsigned char c
);
409 extern int tty_chars_in_buffer(struct tty_struct
*tty
);
410 extern int tty_write_room(struct tty_struct
*tty
);
411 extern void tty_driver_flush_buffer(struct tty_struct
*tty
);
412 extern void tty_throttle(struct tty_struct
*tty
);
413 extern void tty_unthrottle(struct tty_struct
*tty
);
414 extern int tty_throttle_safe(struct tty_struct
*tty
);
415 extern int tty_unthrottle_safe(struct tty_struct
*tty
);
416 extern int tty_do_resize(struct tty_struct
*tty
, struct winsize
*ws
);
417 extern void tty_driver_remove_tty(struct tty_driver
*driver
,
418 struct tty_struct
*tty
);
419 extern void tty_free_termios(struct tty_struct
*tty
);
420 extern int is_current_pgrp_orphaned(void);
421 extern int is_ignored(int sig
);
422 extern int tty_signal(int sig
, struct tty_struct
*tty
);
423 extern void tty_hangup(struct tty_struct
*tty
);
424 extern void tty_vhangup(struct tty_struct
*tty
);
425 extern void tty_vhangup_locked(struct tty_struct
*tty
);
426 extern void tty_unhangup(struct file
*filp
);
427 extern int tty_hung_up_p(struct file
*filp
);
428 extern void do_SAK(struct tty_struct
*tty
);
429 extern void __do_SAK(struct tty_struct
*tty
);
430 extern void no_tty(void);
431 extern void tty_flush_to_ldisc(struct tty_struct
*tty
);
432 extern void tty_buffer_free_all(struct tty_port
*port
);
433 extern void tty_buffer_flush(struct tty_struct
*tty
);
434 extern void tty_buffer_init(struct tty_port
*port
);
435 extern speed_t
tty_termios_baud_rate(struct ktermios
*termios
);
436 extern speed_t
tty_termios_input_baud_rate(struct ktermios
*termios
);
437 extern void tty_termios_encode_baud_rate(struct ktermios
*termios
,
438 speed_t ibaud
, speed_t obaud
);
439 extern void tty_encode_baud_rate(struct tty_struct
*tty
,
440 speed_t ibaud
, speed_t obaud
);
443 * tty_get_baud_rate - get tty bit rates
446 * Returns the baud rate as an integer for this terminal. The
447 * termios lock must be held by the caller and the terminal bit
448 * flags may be updated.
452 static inline speed_t
tty_get_baud_rate(struct tty_struct
*tty
)
454 return tty_termios_baud_rate(&tty
->termios
);
457 extern void tty_termios_copy_hw(struct ktermios
*new, struct ktermios
*old
);
458 extern int tty_termios_hw_change(struct ktermios
*a
, struct ktermios
*b
);
459 extern int tty_set_termios(struct tty_struct
*tty
, struct ktermios
*kt
);
461 extern struct tty_ldisc
*tty_ldisc_ref(struct tty_struct
*);
462 extern void tty_ldisc_deref(struct tty_ldisc
*);
463 extern struct tty_ldisc
*tty_ldisc_ref_wait(struct tty_struct
*);
464 extern void tty_ldisc_hangup(struct tty_struct
*tty
);
465 extern const struct file_operations tty_ldiscs_proc_fops
;
467 extern void tty_wakeup(struct tty_struct
*tty
);
468 extern void tty_ldisc_flush(struct tty_struct
*tty
);
470 extern long tty_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
471 extern int tty_mode_ioctl(struct tty_struct
*tty
, struct file
*file
,
472 unsigned int cmd
, unsigned long arg
);
473 extern int tty_perform_flush(struct tty_struct
*tty
, unsigned long arg
);
474 extern void tty_default_fops(struct file_operations
*fops
);
475 extern struct tty_struct
*alloc_tty_struct(void);
476 extern int tty_alloc_file(struct file
*file
);
477 extern void tty_add_file(struct tty_struct
*tty
, struct file
*file
);
478 extern void tty_free_file(struct file
*file
);
479 extern void free_tty_struct(struct tty_struct
*tty
);
480 extern void initialize_tty_struct(struct tty_struct
*tty
,
481 struct tty_driver
*driver
, int idx
);
482 extern void deinitialize_tty_struct(struct tty_struct
*tty
);
483 extern struct tty_struct
*tty_init_dev(struct tty_driver
*driver
, int idx
);
484 extern int tty_release(struct inode
*inode
, struct file
*filp
);
485 extern int tty_init_termios(struct tty_struct
*tty
);
486 extern int tty_standard_install(struct tty_driver
*driver
,
487 struct tty_struct
*tty
);
489 extern struct tty_struct
*tty_pair_get_tty(struct tty_struct
*tty
);
490 extern struct tty_struct
*tty_pair_get_pty(struct tty_struct
*tty
);
492 extern struct mutex tty_mutex
;
493 extern spinlock_t tty_files_lock
;
495 extern void tty_write_unlock(struct tty_struct
*tty
);
496 extern int tty_write_lock(struct tty_struct
*tty
, int ndelay
);
497 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
499 extern void tty_port_init(struct tty_port
*port
);
500 extern void tty_port_link_device(struct tty_port
*port
,
501 struct tty_driver
*driver
, unsigned index
);
502 extern struct device
*tty_port_register_device(struct tty_port
*port
,
503 struct tty_driver
*driver
, unsigned index
,
504 struct device
*device
);
505 extern struct device
*tty_port_register_device_attr(struct tty_port
*port
,
506 struct tty_driver
*driver
, unsigned index
,
507 struct device
*device
, void *drvdata
,
508 const struct attribute_group
**attr_grp
);
509 extern int tty_port_alloc_xmit_buf(struct tty_port
*port
);
510 extern void tty_port_free_xmit_buf(struct tty_port
*port
);
511 extern void tty_port_destroy(struct tty_port
*port
);
512 extern void tty_port_put(struct tty_port
*port
);
514 static inline struct tty_port
*tty_port_get(struct tty_port
*port
)
517 kref_get(&port
->kref
);
521 /* If the cts flow control is enabled, return true. */
522 static inline bool tty_port_cts_enabled(struct tty_port
*port
)
524 return port
->flags
& ASYNC_CTS_FLOW
;
527 extern struct tty_struct
*tty_port_tty_get(struct tty_port
*port
);
528 extern void tty_port_tty_set(struct tty_port
*port
, struct tty_struct
*tty
);
529 extern int tty_port_carrier_raised(struct tty_port
*port
);
530 extern void tty_port_raise_dtr_rts(struct tty_port
*port
);
531 extern void tty_port_lower_dtr_rts(struct tty_port
*port
);
532 extern void tty_port_hangup(struct tty_port
*port
);
533 extern void tty_port_tty_hangup(struct tty_port
*port
, bool check_clocal
);
534 extern void tty_port_tty_wakeup(struct tty_port
*port
);
535 extern int tty_port_block_til_ready(struct tty_port
*port
,
536 struct tty_struct
*tty
, struct file
*filp
);
537 extern int tty_port_close_start(struct tty_port
*port
,
538 struct tty_struct
*tty
, struct file
*filp
);
539 extern void tty_port_close_end(struct tty_port
*port
, struct tty_struct
*tty
);
540 extern void tty_port_close(struct tty_port
*port
,
541 struct tty_struct
*tty
, struct file
*filp
);
542 extern int tty_port_install(struct tty_port
*port
, struct tty_driver
*driver
,
543 struct tty_struct
*tty
);
544 extern int tty_port_open(struct tty_port
*port
,
545 struct tty_struct
*tty
, struct file
*filp
);
546 static inline int tty_port_users(struct tty_port
*port
)
548 return port
->count
+ port
->blocked_open
;
551 extern int tty_register_ldisc(int disc
, struct tty_ldisc_ops
*new_ldisc
);
552 extern int tty_unregister_ldisc(int disc
);
553 extern int tty_set_ldisc(struct tty_struct
*tty
, int ldisc
);
554 extern int tty_ldisc_setup(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
555 extern void tty_ldisc_release(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
556 extern void tty_ldisc_init(struct tty_struct
*tty
);
557 extern void tty_ldisc_deinit(struct tty_struct
*tty
);
558 extern void tty_ldisc_begin(void);
560 static inline int tty_ldisc_receive_buf(struct tty_ldisc
*ld
, unsigned char *p
,
563 if (ld
->ops
->receive_buf2
)
564 count
= ld
->ops
->receive_buf2(ld
->tty
, p
, f
, count
);
566 count
= min_t(int, count
, ld
->tty
->receive_room
);
568 ld
->ops
->receive_buf(ld
->tty
, p
, f
, count
);
575 extern struct tty_ldisc_ops tty_ldisc_N_TTY
;
576 extern void n_tty_inherit_ops(struct tty_ldisc_ops
*ops
);
580 extern void tty_audit_add_data(struct tty_struct
*tty
, unsigned char *data
,
581 size_t size
, unsigned icanon
);
582 extern void tty_audit_exit(void);
583 extern void tty_audit_fork(struct signal_struct
*sig
);
584 extern void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
);
585 extern void tty_audit_push(struct tty_struct
*tty
);
586 extern int tty_audit_push_current(void);
588 static inline void tty_audit_add_data(struct tty_struct
*tty
,
589 unsigned char *data
, size_t size
, unsigned icanon
)
592 static inline void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
)
595 static inline void tty_audit_exit(void)
598 static inline void tty_audit_fork(struct signal_struct
*sig
)
601 static inline void tty_audit_push(struct tty_struct
*tty
)
604 static inline int tty_audit_push_current(void)
611 extern int n_tty_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
612 unsigned int cmd
, unsigned long arg
);
613 extern long n_tty_compat_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
614 unsigned int cmd
, unsigned long arg
);
618 extern void serial_console_init(void);
622 extern int pcxe_open(struct tty_struct
*tty
, struct file
*filp
);
626 extern int vt_ioctl(struct tty_struct
*tty
,
627 unsigned int cmd
, unsigned long arg
);
629 extern long vt_compat_ioctl(struct tty_struct
*tty
,
630 unsigned int cmd
, unsigned long arg
);
633 /* functions for preparation of BKL removal */
634 extern void __lockfunc
tty_lock(struct tty_struct
*tty
);
635 extern void __lockfunc
tty_unlock(struct tty_struct
*tty
);
636 extern void __lockfunc
tty_lock_pair(struct tty_struct
*tty
,
637 struct tty_struct
*tty2
);
638 extern void __lockfunc
tty_unlock_pair(struct tty_struct
*tty
,
639 struct tty_struct
*tty2
);
642 * this shall be called only from where BTM is held (like close)
644 * We need this to ensure nobody waits for us to finish while we are waiting.
645 * Without this we were encountering system stalls.
647 * This should be indeed removed with BTM removal later.
649 * Locking: BTM required. Nobody is allowed to hold port->mutex.
651 static inline void tty_wait_until_sent_from_close(struct tty_struct
*tty
,
654 tty_unlock(tty
); /* tty->ops->close holds the BTM, drop it while waiting */
655 tty_wait_until_sent(tty
, timeout
);
660 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
662 * The condition we are waiting for might take a long time to
663 * become true, or might depend on another thread taking the
664 * BTM. In either case, we need to drop the BTM to guarantee
665 * forward progress. This is a leftover from the conversion
666 * from the BKL and should eventually get removed as the BTM
669 * Do not use in new code.
671 #define wait_event_interruptible_tty(tty, wq, condition) \
675 __ret = __wait_event_interruptible_tty(tty, wq, \
680 #define __wait_event_interruptible_tty(tty, wq, condition) \
681 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
686 #ifdef CONFIG_PROC_FS
687 extern void proc_tty_register_driver(struct tty_driver
*);
688 extern void proc_tty_unregister_driver(struct tty_driver
*);
690 static inline void proc_tty_register_driver(struct tty_driver
*d
) {}
691 static inline void proc_tty_unregister_driver(struct tty_driver
*d
) {}