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>
17 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
18 * hardcoded at present.)
20 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
21 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
22 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
25 * This character is the same as _POSIX_VDISABLE: it cannot be used as
26 * a c_cc[] character, but indicates that a particular special character
27 * isn't in use (eg VINTR has no character etc)
29 #define __DISABLED_CHAR '\0'
32 struct tty_buffer
*next
;
34 unsigned char *flag_buf_ptr
;
39 /* Data points here */
40 unsigned long data
[0];
44 * We default to dicing tty buffer allocations to this many characters
45 * in order to avoid multiple page allocations. We know the size of
46 * tty_buffer itself but it must also be taken into account that the
47 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
48 * logic this must match
51 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
55 struct work_struct work
;
57 struct tty_buffer
*head
; /* Queue head */
58 struct tty_buffer
*tail
; /* Active buffer */
59 struct tty_buffer
*free
; /* Free queue head */
60 int memory_used
; /* Buffer space used excluding
64 * When a break, frame error, or parity error happens, these codes are
65 * stuffed into the flags buffer.
73 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
74 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
75 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
76 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
77 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
78 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
79 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
80 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
81 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
82 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
83 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
84 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
85 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
86 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
87 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
88 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
89 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
91 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
92 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
93 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
94 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
96 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
97 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
98 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
99 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
100 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
101 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
102 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
103 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
104 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
105 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
106 #define I_IXON(tty) _I_FLAG((tty), IXON)
107 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
108 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
109 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
110 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
112 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
113 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
114 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
115 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
116 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
117 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
118 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
119 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
120 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
121 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
122 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
123 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
124 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
125 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
127 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
128 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
129 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
130 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
131 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
132 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
133 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
134 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
135 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
136 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
138 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
139 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
140 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
141 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
142 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
143 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
144 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
145 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
146 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
147 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
148 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
149 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
150 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
151 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
152 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
153 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
156 struct signal_struct
;
159 * Port level information. Each device keeps its own port level information
160 * so provide a common structure for those ports wanting to use common support
163 * The tty port has a different lifetime to the tty so must be kept apart.
164 * In addition be careful as tty -> port mappings are valid for the life
165 * of the tty object but in many cases port -> tty mappings are valid only
166 * until a hangup so don't use the wrong path.
171 struct tty_port_operations
{
172 /* Return 1 if the carrier is raised */
173 int (*carrier_raised
)(struct tty_port
*port
);
174 /* Control the DTR line */
175 void (*dtr_rts
)(struct tty_port
*port
, int raise
);
176 /* Called when the last close completes or a hangup finishes
177 IFF the port was initialized. Do not use to free resources. Called
178 under the port mutex to serialize against activate/shutdowns */
179 void (*shutdown
)(struct tty_port
*port
);
180 void (*drop
)(struct tty_port
*port
);
181 /* Called under the port mutex from tty_port_open, serialized using
183 /* FIXME: long term getting the tty argument *out* of this would be
185 int (*activate
)(struct tty_port
*port
, struct tty_struct
*tty
);
186 /* Called on the final put of a port */
187 void (*destruct
)(struct tty_port
*port
);
191 struct tty_bufhead buf
; /* Locked internally */
192 struct tty_struct
*tty
; /* Back pointer */
193 struct tty_struct
*itty
; /* internal back ptr */
194 const struct tty_port_operations
*ops
; /* Port operations */
195 spinlock_t lock
; /* Lock protecting tty field */
196 int blocked_open
; /* Waiting to open */
197 int count
; /* Usage count */
198 wait_queue_head_t open_wait
; /* Open waiters */
199 wait_queue_head_t close_wait
; /* Close waiters */
200 wait_queue_head_t delta_msr_wait
; /* Modem status change */
201 unsigned long flags
; /* TTY flags ASY_*/
202 unsigned long iflags
; /* TTYP_ internal flags */
203 #define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
204 #define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
205 unsigned char console
:1, /* port is a console */
206 low_latency
:1; /* direct buffer flush */
207 struct mutex mutex
; /* Locking */
208 struct mutex buf_mutex
; /* Buffer alloc lock */
209 unsigned char *xmit_buf
; /* Optional buffer */
210 unsigned int close_delay
; /* Close port delay */
211 unsigned int closing_wait
; /* Delay for output */
212 int drain_delay
; /* Set to zero if no pure time
213 based drain is needed else
214 set to size of fifo */
215 struct kref kref
; /* Ref counter */
219 * Where all of the state associated with a tty is kept while the tty
220 * is open. Since the termios state should be kept even if the tty
221 * has been closed --- for things like the baud rate, etc --- it is
222 * not stored here, but rather a pointer to the real state is stored
223 * here. Possible the winsize structure should have the same
224 * treatment, but (1) the default 80x24 is usually right and (2) it's
225 * most often used by a windowing system, which will set the correct
226 * size each time the window is created or resized anyway.
230 struct tty_operations
;
236 struct tty_driver
*driver
;
237 const struct tty_operations
*ops
;
240 /* Protects ldisc changes: Lock tty not pty */
241 struct mutex ldisc_mutex
;
242 struct tty_ldisc
*ldisc
;
244 struct mutex atomic_write_lock
;
245 struct mutex legacy_mutex
;
246 struct mutex termios_mutex
;
247 spinlock_t ctrl_lock
;
248 /* Termios values are protected by the termios mutex */
249 struct ktermios termios
, termios_locked
;
250 struct termiox
*termiox
; /* May be NULL for unsupported */
252 struct pid
*pgrp
; /* Protected by ctrl lock */
256 struct winsize winsize
; /* termios mutex */
257 unsigned char stopped
:1, hw_stopped
:1, flow_stopped
:1, packet
:1;
258 unsigned char warned
:1;
259 unsigned char ctrl_status
; /* ctrl_lock */
260 unsigned int receive_room
; /* Bytes free for queue */
262 struct tty_struct
*link
;
263 struct fasync_struct
*fasync
;
264 int alt_speed
; /* For magic substitution of 38400 bps */
265 wait_queue_head_t write_wait
;
266 wait_queue_head_t read_wait
;
267 struct work_struct hangup_work
;
270 struct list_head tty_files
;
272 #define N_TTY_BUF_SIZE 4096
274 unsigned char closing
:1;
275 unsigned short minimum_to_wake
;
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_PUSH 6 /* n_tty private */
308 #define TTY_CLOSING 7 /* ->close() in progress */
309 #define TTY_LDISC 9 /* Line discipline attached */
310 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
311 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
312 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
313 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
314 #define TTY_PTY_LOCK 16 /* pty private */
315 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
316 #define TTY_HUPPED 18 /* Post driver->hangup() */
317 #define TTY_HUPPING 21 /* ->hangup() in progress */
319 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
322 extern void console_init(void);
323 extern void tty_kref_put(struct tty_struct
*tty
);
324 extern struct pid
*tty_get_pgrp(struct tty_struct
*tty
);
325 extern void tty_vhangup_self(void);
326 extern void disassociate_ctty(int priv
);
327 extern dev_t
tty_devnum(struct tty_struct
*tty
);
328 extern void proc_clear_tty(struct task_struct
*p
);
329 extern struct tty_struct
*get_current_tty(void);
331 extern int __init
tty_init(void);
333 static inline void console_init(void)
335 static inline void tty_kref_put(struct tty_struct
*tty
)
337 static inline struct pid
*tty_get_pgrp(struct tty_struct
*tty
)
339 static inline void tty_vhangup_self(void)
341 static inline void disassociate_ctty(int priv
)
343 static inline dev_t
tty_devnum(struct tty_struct
*tty
)
345 static inline void proc_clear_tty(struct task_struct
*p
)
347 static inline struct tty_struct
*get_current_tty(void)
350 static inline int __init
tty_init(void)
354 extern void tty_write_flush(struct tty_struct
*);
356 extern struct ktermios tty_std_termios
;
358 extern int vcs_init(void);
360 extern struct class *tty_class
;
363 * tty_kref_get - get a tty reference
366 * Return a new reference to a tty object. The caller must hold
367 * sufficient locks/counts to ensure that their existing reference cannot
371 static inline struct tty_struct
*tty_kref_get(struct tty_struct
*tty
)
374 kref_get(&tty
->kref
);
378 extern int tty_paranoia_check(struct tty_struct
*tty
, struct inode
*inode
,
379 const char *routine
);
380 extern char *tty_name(struct tty_struct
*tty
, char *buf
);
381 extern void tty_wait_until_sent(struct tty_struct
*tty
, long timeout
);
382 extern int tty_check_change(struct tty_struct
*tty
);
383 extern void stop_tty(struct tty_struct
*tty
);
384 extern void start_tty(struct tty_struct
*tty
);
385 extern int tty_register_driver(struct tty_driver
*driver
);
386 extern int tty_unregister_driver(struct tty_driver
*driver
);
387 extern struct device
*tty_register_device(struct tty_driver
*driver
,
388 unsigned index
, struct device
*dev
);
389 extern struct device
*tty_register_device_attr(struct tty_driver
*driver
,
390 unsigned index
, struct device
*device
,
392 const struct attribute_group
**attr_grp
);
393 extern void tty_unregister_device(struct tty_driver
*driver
, unsigned index
);
394 extern int tty_read_raw_data(struct tty_struct
*tty
, unsigned char *bufp
,
396 extern void tty_write_message(struct tty_struct
*tty
, char *msg
);
397 extern int tty_put_char(struct tty_struct
*tty
, unsigned char c
);
398 extern int tty_chars_in_buffer(struct tty_struct
*tty
);
399 extern int tty_write_room(struct tty_struct
*tty
);
400 extern void tty_driver_flush_buffer(struct tty_struct
*tty
);
401 extern void tty_throttle(struct tty_struct
*tty
);
402 extern void tty_unthrottle(struct tty_struct
*tty
);
403 extern int tty_do_resize(struct tty_struct
*tty
, struct winsize
*ws
);
404 extern void tty_driver_remove_tty(struct tty_driver
*driver
,
405 struct tty_struct
*tty
);
406 extern void tty_free_termios(struct tty_struct
*tty
);
407 extern int is_current_pgrp_orphaned(void);
408 extern int is_ignored(int sig
);
409 extern int tty_signal(int sig
, struct tty_struct
*tty
);
410 extern void tty_hangup(struct tty_struct
*tty
);
411 extern void tty_vhangup(struct tty_struct
*tty
);
412 extern void tty_vhangup_locked(struct tty_struct
*tty
);
413 extern void tty_unhangup(struct file
*filp
);
414 extern int tty_hung_up_p(struct file
*filp
);
415 extern void do_SAK(struct tty_struct
*tty
);
416 extern void __do_SAK(struct tty_struct
*tty
);
417 extern void no_tty(void);
418 extern void tty_flush_to_ldisc(struct tty_struct
*tty
);
419 extern void tty_buffer_free_all(struct tty_port
*port
);
420 extern void tty_buffer_flush(struct tty_struct
*tty
);
421 extern void tty_buffer_init(struct tty_port
*port
);
422 extern speed_t
tty_get_baud_rate(struct tty_struct
*tty
);
423 extern speed_t
tty_termios_baud_rate(struct ktermios
*termios
);
424 extern speed_t
tty_termios_input_baud_rate(struct ktermios
*termios
);
425 extern void tty_termios_encode_baud_rate(struct ktermios
*termios
,
426 speed_t ibaud
, speed_t obaud
);
427 extern void tty_encode_baud_rate(struct tty_struct
*tty
,
428 speed_t ibaud
, speed_t obaud
);
429 extern void tty_termios_copy_hw(struct ktermios
*new, struct ktermios
*old
);
430 extern int tty_termios_hw_change(struct ktermios
*a
, struct ktermios
*b
);
431 extern int tty_set_termios(struct tty_struct
*tty
, struct ktermios
*kt
);
433 extern struct tty_ldisc
*tty_ldisc_ref(struct tty_struct
*);
434 extern void tty_ldisc_deref(struct tty_ldisc
*);
435 extern struct tty_ldisc
*tty_ldisc_ref_wait(struct tty_struct
*);
436 extern void tty_ldisc_hangup(struct tty_struct
*tty
);
437 extern const struct file_operations tty_ldiscs_proc_fops
;
439 extern void tty_wakeup(struct tty_struct
*tty
);
440 extern void tty_ldisc_flush(struct tty_struct
*tty
);
442 extern long tty_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
443 extern int tty_mode_ioctl(struct tty_struct
*tty
, struct file
*file
,
444 unsigned int cmd
, unsigned long arg
);
445 extern int tty_perform_flush(struct tty_struct
*tty
, unsigned long arg
);
446 extern void tty_default_fops(struct file_operations
*fops
);
447 extern struct tty_struct
*alloc_tty_struct(void);
448 extern int tty_alloc_file(struct file
*file
);
449 extern void tty_add_file(struct tty_struct
*tty
, struct file
*file
);
450 extern void tty_free_file(struct file
*file
);
451 extern void free_tty_struct(struct tty_struct
*tty
);
452 extern void initialize_tty_struct(struct tty_struct
*tty
,
453 struct tty_driver
*driver
, int idx
);
454 extern void deinitialize_tty_struct(struct tty_struct
*tty
);
455 extern struct tty_struct
*tty_init_dev(struct tty_driver
*driver
, int idx
);
456 extern int tty_release(struct inode
*inode
, struct file
*filp
);
457 extern int tty_init_termios(struct tty_struct
*tty
);
458 extern int tty_standard_install(struct tty_driver
*driver
,
459 struct tty_struct
*tty
);
461 extern struct tty_struct
*tty_pair_get_tty(struct tty_struct
*tty
);
462 extern struct tty_struct
*tty_pair_get_pty(struct tty_struct
*tty
);
464 extern struct mutex tty_mutex
;
465 extern spinlock_t tty_files_lock
;
467 extern void tty_write_unlock(struct tty_struct
*tty
);
468 extern int tty_write_lock(struct tty_struct
*tty
, int ndelay
);
469 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
471 extern void tty_port_init(struct tty_port
*port
);
472 extern void tty_port_link_device(struct tty_port
*port
,
473 struct tty_driver
*driver
, unsigned index
);
474 extern struct device
*tty_port_register_device(struct tty_port
*port
,
475 struct tty_driver
*driver
, unsigned index
,
476 struct device
*device
);
477 extern struct device
*tty_port_register_device_attr(struct tty_port
*port
,
478 struct tty_driver
*driver
, unsigned index
,
479 struct device
*device
, void *drvdata
,
480 const struct attribute_group
**attr_grp
);
481 extern int tty_port_alloc_xmit_buf(struct tty_port
*port
);
482 extern void tty_port_free_xmit_buf(struct tty_port
*port
);
483 extern void tty_port_destroy(struct tty_port
*port
);
484 extern void tty_port_put(struct tty_port
*port
);
486 static inline struct tty_port
*tty_port_get(struct tty_port
*port
)
489 kref_get(&port
->kref
);
493 /* If the cts flow control is enabled, return true. */
494 static inline bool tty_port_cts_enabled(struct tty_port
*port
)
496 return port
->flags
& ASYNC_CTS_FLOW
;
499 extern struct tty_struct
*tty_port_tty_get(struct tty_port
*port
);
500 extern void tty_port_tty_set(struct tty_port
*port
, struct tty_struct
*tty
);
501 extern int tty_port_carrier_raised(struct tty_port
*port
);
502 extern void tty_port_raise_dtr_rts(struct tty_port
*port
);
503 extern void tty_port_lower_dtr_rts(struct tty_port
*port
);
504 extern void tty_port_hangup(struct tty_port
*port
);
505 extern int tty_port_block_til_ready(struct tty_port
*port
,
506 struct tty_struct
*tty
, struct file
*filp
);
507 extern int tty_port_close_start(struct tty_port
*port
,
508 struct tty_struct
*tty
, struct file
*filp
);
509 extern void tty_port_close_end(struct tty_port
*port
, struct tty_struct
*tty
);
510 extern void tty_port_close(struct tty_port
*port
,
511 struct tty_struct
*tty
, struct file
*filp
);
512 extern int tty_port_install(struct tty_port
*port
, struct tty_driver
*driver
,
513 struct tty_struct
*tty
);
514 extern int tty_port_open(struct tty_port
*port
,
515 struct tty_struct
*tty
, struct file
*filp
);
516 static inline int tty_port_users(struct tty_port
*port
)
518 return port
->count
+ port
->blocked_open
;
521 extern int tty_register_ldisc(int disc
, struct tty_ldisc_ops
*new_ldisc
);
522 extern int tty_unregister_ldisc(int disc
);
523 extern int tty_set_ldisc(struct tty_struct
*tty
, int ldisc
);
524 extern int tty_ldisc_setup(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
525 extern void tty_ldisc_release(struct tty_struct
*tty
, struct tty_struct
*o_tty
);
526 extern void tty_ldisc_init(struct tty_struct
*tty
);
527 extern void tty_ldisc_deinit(struct tty_struct
*tty
);
528 extern void tty_ldisc_begin(void);
529 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
530 extern void tty_ldisc_enable(struct tty_struct
*tty
);
534 extern struct tty_ldisc_ops tty_ldisc_N_TTY
;
535 extern void n_tty_inherit_ops(struct tty_ldisc_ops
*ops
);
539 extern void tty_audit_add_data(struct tty_struct
*tty
, unsigned char *data
,
540 size_t size
, unsigned icanon
);
541 extern void tty_audit_exit(void);
542 extern void tty_audit_fork(struct signal_struct
*sig
);
543 extern void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
);
544 extern void tty_audit_push(struct tty_struct
*tty
);
545 extern int tty_audit_push_task(struct task_struct
*tsk
,
546 kuid_t loginuid
, u32 sessionid
);
548 static inline void tty_audit_add_data(struct tty_struct
*tty
,
549 unsigned char *data
, size_t size
, unsigned icanon
)
552 static inline void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
)
555 static inline void tty_audit_exit(void)
558 static inline void tty_audit_fork(struct signal_struct
*sig
)
561 static inline void tty_audit_push(struct tty_struct
*tty
)
564 static inline int tty_audit_push_task(struct task_struct
*tsk
,
565 kuid_t loginuid
, u32 sessionid
)
572 extern int n_tty_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
573 unsigned int cmd
, unsigned long arg
);
574 extern long n_tty_compat_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
575 unsigned int cmd
, unsigned long arg
);
579 extern void serial_console_init(void);
583 extern int pcxe_open(struct tty_struct
*tty
, struct file
*filp
);
587 extern int vt_ioctl(struct tty_struct
*tty
,
588 unsigned int cmd
, unsigned long arg
);
590 extern long vt_compat_ioctl(struct tty_struct
*tty
,
591 unsigned int cmd
, unsigned long arg
);
594 /* functions for preparation of BKL removal */
595 extern void __lockfunc
tty_lock(struct tty_struct
*tty
);
596 extern void __lockfunc
tty_unlock(struct tty_struct
*tty
);
597 extern void __lockfunc
tty_lock_pair(struct tty_struct
*tty
,
598 struct tty_struct
*tty2
);
599 extern void __lockfunc
tty_unlock_pair(struct tty_struct
*tty
,
600 struct tty_struct
*tty2
);
603 * this shall be called only from where BTM is held (like close)
605 * We need this to ensure nobody waits for us to finish while we are waiting.
606 * Without this we were encountering system stalls.
608 * This should be indeed removed with BTM removal later.
610 * Locking: BTM required. Nobody is allowed to hold port->mutex.
612 static inline void tty_wait_until_sent_from_close(struct tty_struct
*tty
,
615 tty_unlock(tty
); /* tty->ops->close holds the BTM, drop it while waiting */
616 tty_wait_until_sent(tty
, timeout
);
621 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
623 * The condition we are waiting for might take a long time to
624 * become true, or might depend on another thread taking the
625 * BTM. In either case, we need to drop the BTM to guarantee
626 * forward progress. This is a leftover from the conversion
627 * from the BKL and should eventually get removed as the BTM
630 * Do not use in new code.
632 #define wait_event_interruptible_tty(tty, wq, condition) \
635 if (!(condition)) { \
636 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
641 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
643 DEFINE_WAIT(__wait); \
646 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
649 if (!signal_pending(current)) { \
655 ret = -ERESTARTSYS; \
658 finish_wait(&wq, &__wait); \