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
;
43 /* Data points here */
44 unsigned long data
[0];
47 /* Values for .flags field of tty_buffer */
48 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
50 static inline unsigned char *char_buf_ptr(struct tty_buffer
*b
, int ofs
)
52 return ((unsigned char *)b
->data
) + ofs
;
55 static inline char *flag_buf_ptr(struct tty_buffer
*b
, int ofs
)
57 return (char *)char_buf_ptr(b
, ofs
) + b
->size
;
61 struct tty_buffer
*head
; /* Queue head */
62 struct work_struct work
;
64 spinlock_t flush_lock
;
66 struct tty_buffer sentinel
;
67 struct llist_head free
; /* Free queue head */
68 atomic_t mem_used
; /* In-use buffers excluding free list */
70 struct tty_buffer
*tail
; /* Active buffer */
73 * When a break, frame error, or parity error happens, these codes are
74 * stuffed into the flags buffer.
82 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
83 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
84 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
85 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
86 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
87 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
88 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
89 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
90 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
91 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
92 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
93 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
94 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
95 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
96 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
97 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
98 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
100 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
101 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
102 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
103 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
105 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
106 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
107 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
108 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
109 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
110 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
111 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
112 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
113 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
114 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
115 #define I_IXON(tty) _I_FLAG((tty), IXON)
116 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
117 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
118 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
119 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
121 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
122 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
123 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
124 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
125 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
126 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
127 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
128 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
129 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
130 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
131 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
132 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
133 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
134 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
136 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
137 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
138 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
139 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
140 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
141 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
142 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
143 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
144 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
145 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
146 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
148 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
149 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
150 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
151 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
152 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
153 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
154 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
155 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
156 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
157 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
158 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
159 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
160 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
161 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
162 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
163 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
166 struct signal_struct
;
169 * Port level information. Each device keeps its own port level information
170 * so provide a common structure for those ports wanting to use common support
173 * The tty port has a different lifetime to the tty so must be kept apart.
174 * In addition be careful as tty -> port mappings are valid for the life
175 * of the tty object but in many cases port -> tty mappings are valid only
176 * until a hangup so don't use the wrong path.
181 struct tty_port_operations
{
182 /* Return 1 if the carrier is raised */
183 int (*carrier_raised
)(struct tty_port
*port
);
184 /* Control the DTR line */
185 void (*dtr_rts
)(struct tty_port
*port
, int raise
);
186 /* Called when the last close completes or a hangup finishes
187 IFF the port was initialized. Do not use to free resources. Called
188 under the port mutex to serialize against activate/shutdowns */
189 void (*shutdown
)(struct tty_port
*port
);
190 /* Called under the port mutex from tty_port_open, serialized using
192 /* FIXME: long term getting the tty argument *out* of this would be
194 int (*activate
)(struct tty_port
*port
, struct tty_struct
*tty
);
195 /* Called on the final put of a port */
196 void (*destruct
)(struct tty_port
*port
);
200 struct tty_bufhead buf
; /* Locked internally */
201 struct tty_struct
*tty
; /* Back pointer */
202 struct tty_struct
*itty
; /* internal back ptr */
203 const struct tty_port_operations
*ops
; /* Port operations */
204 spinlock_t lock
; /* Lock protecting tty field */
205 int blocked_open
; /* Waiting to open */
206 int count
; /* Usage count */
207 wait_queue_head_t open_wait
; /* Open waiters */
208 wait_queue_head_t close_wait
; /* Close waiters */
209 wait_queue_head_t delta_msr_wait
; /* Modem status change */
210 unsigned long flags
; /* TTY flags ASY_*/
211 unsigned char console
:1, /* port is a console */
212 low_latency
:1; /* optional: tune for latency */
213 struct mutex mutex
; /* Locking */
214 struct mutex buf_mutex
; /* Buffer alloc lock */
215 unsigned char *xmit_buf
; /* Optional buffer */
216 unsigned int close_delay
; /* Close port delay */
217 unsigned int closing_wait
; /* Delay for output */
218 int drain_delay
; /* Set to zero if no pure time
219 based drain is needed else
220 set to size of fifo */
221 struct kref kref
; /* Ref counter */
225 * Where all of the state associated with a tty is kept while the tty
226 * is open. Since the termios state should be kept even if the tty
227 * has been closed --- for things like the baud rate, etc --- it is
228 * not stored here, but rather a pointer to the real state is stored
229 * here. Possible the winsize structure should have the same
230 * treatment, but (1) the default 80x24 is usually right and (2) it's
231 * most often used by a windowing system, which will set the correct
232 * size each time the window is created or resized anyway.
236 struct tty_operations
;
242 struct tty_driver
*driver
;
243 const struct tty_operations
*ops
;
246 /* Protects ldisc changes: Lock tty not pty */
247 struct ld_semaphore ldisc_sem
;
248 struct tty_ldisc
*ldisc
;
250 struct mutex atomic_write_lock
;
251 struct mutex legacy_mutex
;
252 struct mutex throttle_mutex
;
253 struct rw_semaphore termios_rwsem
;
254 struct mutex winsize_mutex
;
255 spinlock_t ctrl_lock
;
256 /* Termios values are protected by the termios rwsem */
257 struct ktermios termios
, termios_locked
;
258 struct termiox
*termiox
; /* May be NULL for unsupported */
260 struct pid
*pgrp
; /* Protected by ctrl lock */
264 struct winsize winsize
; /* winsize_mutex */
265 unsigned char stopped
:1, hw_stopped
:1, flow_stopped
:1, packet
:1;
266 unsigned char ctrl_status
; /* ctrl_lock */
267 unsigned int receive_room
; /* Bytes free for queue */
270 struct tty_struct
*link
;
271 struct fasync_struct
*fasync
;
272 int alt_speed
; /* For magic substitution of 38400 bps */
273 wait_queue_head_t write_wait
;
274 wait_queue_head_t read_wait
;
275 struct work_struct hangup_work
;
278 struct list_head tty_files
;
280 #define N_TTY_BUF_SIZE 4096
282 unsigned char closing
:1;
283 unsigned char *write_buf
;
285 /* If the tty has a pending do_SAK, queue it here - akpm */
286 struct work_struct SAK_work
;
287 struct tty_port
*port
;
290 /* Each of a tty's open files has private_data pointing to tty_file_private */
291 struct tty_file_private
{
292 struct tty_struct
*tty
;
294 struct list_head list
;
297 /* tty magic number */
298 #define TTY_MAGIC 0x5401
301 * These bits are used in the flags field of the tty structure.
303 * So that interrupts won't be able to mess up the queues,
304 * copy_to_cooked must be atomic with respect to itself, as must
305 * tty->write. Thus, you must use the inline functions set_bit() and
306 * clear_bit() to make things atomic.
308 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
309 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
310 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
311 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
312 #define TTY_DEBUG 4 /* Debugging */
313 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
314 #define TTY_CLOSING 7 /* ->close() in progress */
315 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
316 #define TTY_PTY_LOCK 16 /* pty private */
317 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
318 #define TTY_HUPPED 18 /* Post driver->hangup() */
319 #define TTY_HUPPING 21 /* ->hangup() in progress */
320 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
322 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
324 /* Values for tty->flow_change */
325 #define TTY_THROTTLE_SAFE 1
326 #define TTY_UNTHROTTLE_SAFE 2
328 static inline void __tty_set_flow_change(struct tty_struct
*tty
, int val
)
330 tty
->flow_change
= val
;
333 static inline void tty_set_flow_change(struct tty_struct
*tty
, int val
)
335 tty
->flow_change
= val
;
340 extern void console_init(void);
341 extern void tty_kref_put(struct tty_struct
*tty
);
342 extern struct pid
*tty_get_pgrp(struct tty_struct
*tty
);
343 extern void tty_vhangup_self(void);
344 extern void disassociate_ctty(int priv
);
345 extern dev_t
tty_devnum(struct tty_struct
*tty
);
346 extern void proc_clear_tty(struct task_struct
*p
);
347 extern struct tty_struct
*get_current_tty(void);
349 extern int __init
tty_init(void);
351 static inline void console_init(void)
353 static inline void tty_kref_put(struct tty_struct
*tty
)
355 static inline struct pid
*tty_get_pgrp(struct tty_struct
*tty
)
357 static inline void tty_vhangup_self(void)
359 static inline void disassociate_ctty(int priv
)
361 static inline dev_t
tty_devnum(struct tty_struct
*tty
)
363 static inline void proc_clear_tty(struct task_struct
*p
)
365 static inline struct tty_struct
*get_current_tty(void)
368 static inline int __init
tty_init(void)
372 extern void tty_write_flush(struct tty_struct
*);
374 extern struct ktermios tty_std_termios
;
376 extern int vcs_init(void);
378 extern struct class *tty_class
;
381 * tty_kref_get - get a tty reference
384 * Return a new reference to a tty object. The caller must hold
385 * sufficient locks/counts to ensure that their existing reference cannot
389 static inline struct tty_struct
*tty_kref_get(struct tty_struct
*tty
)
392 kref_get(&tty
->kref
);
396 extern int tty_paranoia_check(struct tty_struct
*tty
, struct inode
*inode
,
397 const char *routine
);
398 extern char *tty_name(struct tty_struct
*tty
, char *buf
);
399 extern void tty_wait_until_sent(struct tty_struct
*tty
, long timeout
);
400 extern int tty_check_change(struct tty_struct
*tty
);
401 extern void stop_tty(struct tty_struct
*tty
);
402 extern void start_tty(struct tty_struct
*tty
);
403 extern int tty_register_driver(struct tty_driver
*driver
);
404 extern int tty_unregister_driver(struct tty_driver
*driver
);
405 extern struct device
*tty_register_device(struct tty_driver
*driver
,
406 unsigned index
, struct device
*dev
);
407 extern struct device
*tty_register_device_attr(struct tty_driver
*driver
,
408 unsigned index
, struct device
*device
,
410 const struct attribute_group
**attr_grp
);
411 extern void tty_unregister_device(struct tty_driver
*driver
, unsigned index
);
412 extern int tty_read_raw_data(struct tty_struct
*tty
, unsigned char *bufp
,
414 extern void tty_write_message(struct tty_struct
*tty
, char *msg
);
415 extern int tty_put_char(struct tty_struct
*tty
, unsigned char c
);
416 extern int tty_chars_in_buffer(struct tty_struct
*tty
);
417 extern int tty_write_room(struct tty_struct
*tty
);
418 extern void tty_driver_flush_buffer(struct tty_struct
*tty
);
419 extern void tty_throttle(struct tty_struct
*tty
);
420 extern void tty_unthrottle(struct tty_struct
*tty
);
421 extern int tty_throttle_safe(struct tty_struct
*tty
);
422 extern int tty_unthrottle_safe(struct tty_struct
*tty
);
423 extern int tty_do_resize(struct tty_struct
*tty
, struct winsize
*ws
);
424 extern void tty_driver_remove_tty(struct tty_driver
*driver
,
425 struct tty_struct
*tty
);
426 extern void tty_free_termios(struct tty_struct
*tty
);
427 extern int is_current_pgrp_orphaned(void);
428 extern int is_ignored(int sig
);
429 extern int tty_signal(int sig
, struct tty_struct
*tty
);
430 extern void tty_hangup(struct tty_struct
*tty
);
431 extern void tty_vhangup(struct tty_struct
*tty
);
432 extern void tty_unhangup(struct file
*filp
);
433 extern int tty_hung_up_p(struct file
*filp
);
434 extern void do_SAK(struct tty_struct
*tty
);
435 extern void __do_SAK(struct tty_struct
*tty
);
436 extern void no_tty(void);
437 extern void tty_flush_to_ldisc(struct tty_struct
*tty
);
438 extern void tty_buffer_free_all(struct tty_port
*port
);
439 extern void tty_buffer_flush(struct tty_struct
*tty
);
440 extern void tty_buffer_init(struct tty_port
*port
);
441 extern speed_t
tty_termios_baud_rate(struct ktermios
*termios
);
442 extern speed_t
tty_termios_input_baud_rate(struct ktermios
*termios
);
443 extern void tty_termios_encode_baud_rate(struct ktermios
*termios
,
444 speed_t ibaud
, speed_t obaud
);
445 extern void tty_encode_baud_rate(struct tty_struct
*tty
,
446 speed_t ibaud
, speed_t obaud
);
449 * tty_get_baud_rate - get tty bit rates
452 * Returns the baud rate as an integer for this terminal. The
453 * termios lock must be held by the caller and the terminal bit
454 * flags may be updated.
458 static inline speed_t
tty_get_baud_rate(struct tty_struct
*tty
)
460 return tty_termios_baud_rate(&tty
->termios
);
463 extern void tty_termios_copy_hw(struct ktermios
*new, struct ktermios
*old
);
464 extern int tty_termios_hw_change(struct ktermios
*a
, struct ktermios
*b
);
465 extern int tty_set_termios(struct tty_struct
*tty
, struct ktermios
*kt
);
467 extern struct tty_ldisc
*tty_ldisc_ref(struct tty_struct
*);
468 extern void tty_ldisc_deref(struct tty_ldisc
*);
469 extern struct tty_ldisc
*tty_ldisc_ref_wait(struct tty_struct
*);
470 extern void tty_ldisc_hangup(struct tty_struct
*tty
);
471 extern const struct file_operations tty_ldiscs_proc_fops
;
473 extern void tty_wakeup(struct tty_struct
*tty
);
474 extern void tty_ldisc_flush(struct tty_struct
*tty
);
476 extern long tty_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
477 extern int tty_mode_ioctl(struct tty_struct
*tty
, struct file
*file
,
478 unsigned int cmd
, unsigned long arg
);
479 extern int tty_perform_flush(struct tty_struct
*tty
, unsigned long arg
);
480 extern void tty_default_fops(struct file_operations
*fops
);
481 extern struct tty_struct
*alloc_tty_struct(void);
482 extern int tty_alloc_file(struct file
*file
);
483 extern void tty_add_file(struct tty_struct
*tty
, struct file
*file
);
484 extern void tty_free_file(struct file
*file
);
485 extern void free_tty_struct(struct tty_struct
*tty
);
486 extern void initialize_tty_struct(struct tty_struct
*tty
,
487 struct tty_driver
*driver
, int idx
);
488 extern void deinitialize_tty_struct(struct tty_struct
*tty
);
489 extern struct tty_struct
*tty_init_dev(struct tty_driver
*driver
, int idx
);
490 extern int tty_release(struct inode
*inode
, struct file
*filp
);
491 extern int tty_init_termios(struct tty_struct
*tty
);
492 extern int tty_standard_install(struct tty_driver
*driver
,
493 struct tty_struct
*tty
);
495 extern struct tty_struct
*tty_pair_get_tty(struct tty_struct
*tty
);
496 extern struct tty_struct
*tty_pair_get_pty(struct tty_struct
*tty
);
498 extern struct mutex tty_mutex
;
499 extern spinlock_t tty_files_lock
;
501 extern void tty_write_unlock(struct tty_struct
*tty
);
502 extern int tty_write_lock(struct tty_struct
*tty
, int ndelay
);
503 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
505 extern void tty_port_init(struct tty_port
*port
);
506 extern void tty_port_link_device(struct tty_port
*port
,
507 struct tty_driver
*driver
, unsigned index
);
508 extern struct device
*tty_port_register_device(struct tty_port
*port
,
509 struct tty_driver
*driver
, unsigned index
,
510 struct device
*device
);
511 extern struct device
*tty_port_register_device_attr(struct tty_port
*port
,
512 struct tty_driver
*driver
, unsigned index
,
513 struct device
*device
, void *drvdata
,
514 const struct attribute_group
**attr_grp
);
515 extern int tty_port_alloc_xmit_buf(struct tty_port
*port
);
516 extern void tty_port_free_xmit_buf(struct tty_port
*port
);
517 extern void tty_port_destroy(struct tty_port
*port
);
518 extern void tty_port_put(struct tty_port
*port
);
520 static inline struct tty_port
*tty_port_get(struct tty_port
*port
)
522 if (port
&& kref_get_unless_zero(&port
->kref
))
527 /* If the cts flow control is enabled, return true. */
528 static inline bool tty_port_cts_enabled(struct tty_port
*port
)
530 return port
->flags
& ASYNC_CTS_FLOW
;
533 extern struct tty_struct
*tty_port_tty_get(struct tty_port
*port
);
534 extern void tty_port_tty_set(struct tty_port
*port
, struct tty_struct
*tty
);
535 extern int tty_port_carrier_raised(struct tty_port
*port
);
536 extern void tty_port_raise_dtr_rts(struct tty_port
*port
);
537 extern void tty_port_lower_dtr_rts(struct tty_port
*port
);
538 extern void tty_port_hangup(struct tty_port
*port
);
539 extern void tty_port_tty_hangup(struct tty_port
*port
, bool check_clocal
);
540 extern void tty_port_tty_wakeup(struct tty_port
*port
);
541 extern int tty_port_block_til_ready(struct tty_port
*port
,
542 struct tty_struct
*tty
, struct file
*filp
);
543 extern int tty_port_close_start(struct tty_port
*port
,
544 struct tty_struct
*tty
, struct file
*filp
);
545 extern void tty_port_close_end(struct tty_port
*port
, struct tty_struct
*tty
);
546 extern void tty_port_close(struct tty_port
*port
,
547 struct tty_struct
*tty
, struct file
*filp
);
548 extern int tty_port_install(struct tty_port
*port
, struct tty_driver
*driver
,
549 struct tty_struct
*tty
);
550 extern int tty_port_open(struct tty_port
*port
,
551 struct tty_struct
*tty
, struct file
*filp
);
552 static inline int tty_port_users(struct tty_port
*port
)
554 return port
->count
+ port
->blocked_open
;
557 extern int tty_register_ldisc(int disc
, struct tty_ldisc_ops
*new_ldisc
);
558 extern int tty_unregister_ldisc(int disc
);
559 extern int tty_set_ldisc(struct tty_struct
*tty
, int ldisc
);
560 extern int tty_ldisc_setup(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
561 extern void tty_ldisc_release(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
562 extern void tty_ldisc_init(struct tty_struct
*tty
);
563 extern void tty_ldisc_deinit(struct tty_struct
*tty
);
564 extern void tty_ldisc_begin(void);
566 static inline int tty_ldisc_receive_buf(struct tty_ldisc
*ld
, unsigned char *p
,
569 if (ld
->ops
->receive_buf2
)
570 count
= ld
->ops
->receive_buf2(ld
->tty
, p
, f
, count
);
572 count
= min_t(int, count
, ld
->tty
->receive_room
);
574 ld
->ops
->receive_buf(ld
->tty
, p
, f
, count
);
581 extern struct tty_ldisc_ops tty_ldisc_N_TTY
;
582 extern void n_tty_inherit_ops(struct tty_ldisc_ops
*ops
);
586 extern void tty_audit_add_data(struct tty_struct
*tty
, unsigned char *data
,
587 size_t size
, unsigned icanon
);
588 extern void tty_audit_exit(void);
589 extern void tty_audit_fork(struct signal_struct
*sig
);
590 extern void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
);
591 extern void tty_audit_push(struct tty_struct
*tty
);
592 extern int tty_audit_push_current(void);
594 static inline void tty_audit_add_data(struct tty_struct
*tty
,
595 unsigned char *data
, size_t size
, unsigned icanon
)
598 static inline void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
)
601 static inline void tty_audit_exit(void)
604 static inline void tty_audit_fork(struct signal_struct
*sig
)
607 static inline void tty_audit_push(struct tty_struct
*tty
)
610 static inline int tty_audit_push_current(void)
617 extern int n_tty_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
618 unsigned int cmd
, unsigned long arg
);
619 extern long n_tty_compat_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
620 unsigned int cmd
, unsigned long arg
);
624 extern void serial_console_init(void);
628 extern int pcxe_open(struct tty_struct
*tty
, struct file
*filp
);
632 extern int vt_ioctl(struct tty_struct
*tty
,
633 unsigned int cmd
, unsigned long arg
);
635 extern long vt_compat_ioctl(struct tty_struct
*tty
,
636 unsigned int cmd
, unsigned long arg
);
639 /* functions for preparation of BKL removal */
640 extern void __lockfunc
tty_lock(struct tty_struct
*tty
);
641 extern void __lockfunc
tty_unlock(struct tty_struct
*tty
);
642 extern void __lockfunc
tty_lock_pair(struct tty_struct
*tty
,
643 struct tty_struct
*tty2
);
644 extern void __lockfunc
tty_unlock_pair(struct tty_struct
*tty
,
645 struct tty_struct
*tty2
);
648 * this shall be called only from where BTM is held (like close)
650 * We need this to ensure nobody waits for us to finish while we are waiting.
651 * Without this we were encountering system stalls.
653 * This should be indeed removed with BTM removal later.
655 * Locking: BTM required. Nobody is allowed to hold port->mutex.
657 static inline void tty_wait_until_sent_from_close(struct tty_struct
*tty
,
660 tty_unlock(tty
); /* tty->ops->close holds the BTM, drop it while waiting */
661 tty_wait_until_sent(tty
, timeout
);
666 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
668 * The condition we are waiting for might take a long time to
669 * become true, or might depend on another thread taking the
670 * BTM. In either case, we need to drop the BTM to guarantee
671 * forward progress. This is a leftover from the conversion
672 * from the BKL and should eventually get removed as the BTM
675 * Do not use in new code.
677 #define wait_event_interruptible_tty(tty, wq, condition) \
681 __ret = __wait_event_interruptible_tty(tty, wq, \
686 #define __wait_event_interruptible_tty(tty, wq, condition) \
687 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
692 #ifdef CONFIG_PROC_FS
693 extern void proc_tty_register_driver(struct tty_driver
*);
694 extern void proc_tty_unregister_driver(struct tty_driver
*);
696 static inline void proc_tty_register_driver(struct tty_driver
*d
) {}
697 static inline void proc_tty_unregister_driver(struct tty_driver
*d
) {}