1
2#ifndef _LINUX_TTY_H
3#define _LINUX_TTY_H
4
5#include <linux/fs.h>
6#include <linux/major.h>
7#include <linux/termios.h>
8#include <linux/workqueue.h>
9#include <linux/tty_driver.h>
10#include <linux/tty_ldisc.h>
11#include <linux/mutex.h>
12#include <linux/tty_flags.h>
13#include <linux/seq_file.h>
14#include <uapi/linux/tty.h>
15#include <linux/rwsem.h>
16#include <linux/llist.h>
17
18
19
20
21
22
23#define NR_UNIX98_PTY_DEFAULT 4096
24#define NR_UNIX98_PTY_RESERVE 1024
25#define NR_UNIX98_PTY_MAX (1 << MINORBITS)
26
27
28
29
30
31
32#define __DISABLED_CHAR '\0'
33
34struct tty_buffer {
35 union {
36 struct tty_buffer *next;
37 struct llist_node free;
38 };
39 int used;
40 int size;
41 int commit;
42 int read;
43 int flags;
44
45 unsigned long data[];
46};
47
48
49#define TTYB_NORMAL 1
50
51static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
52{
53 return ((unsigned char *)b->data) + ofs;
54}
55
56static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
57{
58 return (char *)char_buf_ptr(b, ofs) + b->size;
59}
60
61struct tty_bufhead {
62 struct tty_buffer *head;
63 struct work_struct work;
64 struct mutex lock;
65 atomic_t priority;
66 struct tty_buffer sentinel;
67 struct llist_head free;
68 atomic_t mem_used;
69 int mem_limit;
70 struct tty_buffer *tail;
71};
72
73
74
75
76#define TTY_NORMAL 0
77#define TTY_BREAK 1
78#define TTY_FRAME 2
79#define TTY_PARITY 3
80#define TTY_OVERRUN 4
81
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])
99
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))
104
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)
120
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)
135
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)
147
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)
164
165struct device;
166struct signal_struct;
167
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177
178
179struct tty_port;
180
181struct tty_port_operations {
182
183 int (*carrier_raised)(struct tty_port *port);
184
185 void (*dtr_rts)(struct tty_port *port, int raise);
186
187
188
189 void (*shutdown)(struct tty_port *port);
190
191
192
193
194 int (*activate)(struct tty_port *port, struct tty_struct *tty);
195
196 void (*destruct)(struct tty_port *port);
197};
198
199struct tty_port_client_operations {
200 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
201 void (*write_wakeup)(struct tty_port *port);
202};
203
204extern const struct tty_port_client_operations tty_port_default_client_ops;
205
206struct tty_port {
207 struct tty_bufhead buf;
208 struct tty_struct *tty;
209 struct tty_struct *itty;
210 const struct tty_port_operations *ops;
211 const struct tty_port_client_operations *client_ops;
212 spinlock_t lock;
213 int blocked_open;
214 int count;
215 wait_queue_head_t open_wait;
216 wait_queue_head_t delta_msr_wait;
217 unsigned long flags;
218 unsigned long iflags;
219 unsigned char console:1;
220 struct mutex mutex;
221 struct mutex buf_mutex;
222 unsigned char *xmit_buf;
223 unsigned int close_delay;
224 unsigned int closing_wait;
225 int drain_delay;
226
227
228 struct kref kref;
229 void *client_data;
230};
231
232
233#define TTY_PORT_INITIALIZED 0
234#define TTY_PORT_SUSPENDED 1
235#define TTY_PORT_ACTIVE 2
236
237
238
239
240
241#define TTY_PORT_CTS_FLOW 3
242#define TTY_PORT_CHECK_CD 4
243#define TTY_PORT_KOPENED 5
244
245
246struct tty_operations;
247
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267
268
269struct tty_struct {
270 int magic;
271 struct kref kref;
272 struct device *dev;
273 struct tty_driver *driver;
274 const struct tty_operations *ops;
275 int index;
276
277
278 struct ld_semaphore ldisc_sem;
279 struct tty_ldisc *ldisc;
280
281 struct mutex atomic_write_lock;
282 struct mutex legacy_mutex;
283 struct mutex throttle_mutex;
284 struct rw_semaphore termios_rwsem;
285 struct mutex winsize_mutex;
286
287 struct ktermios termios, termios_locked;
288 char name[64];
289 unsigned long flags;
290 int count;
291 struct winsize winsize;
292
293 struct {
294 spinlock_t lock;
295 bool stopped;
296 bool tco_stopped;
297 unsigned long unused[0];
298 } __aligned(sizeof(unsigned long)) flow;
299
300 struct {
301 spinlock_t lock;
302 struct pid *pgrp;
303 struct pid *session;
304 unsigned char pktstatus;
305 bool packet;
306 unsigned long unused[0];
307 } __aligned(sizeof(unsigned long)) ctrl;
308
309 int hw_stopped;
310 unsigned int receive_room;
311 int flow_change;
312
313 struct tty_struct *link;
314 struct fasync_struct *fasync;
315 wait_queue_head_t write_wait;
316 wait_queue_head_t read_wait;
317 struct work_struct hangup_work;
318 void *disc_data;
319 void *driver_data;
320 spinlock_t files_lock;
321 struct list_head tty_files;
322
323#define N_TTY_BUF_SIZE 4096
324
325 int closing;
326 unsigned char *write_buf;
327 int write_cnt;
328
329 struct work_struct SAK_work;
330 struct tty_port *port;
331} __randomize_layout;
332
333
334struct tty_file_private {
335 struct tty_struct *tty;
336 struct file *file;
337 struct list_head list;
338};
339
340
341#define TTY_MAGIC 0x5401
342
343
344
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346
347
348
349
350
351#define TTY_THROTTLED 0
352#define TTY_IO_ERROR 1
353#define TTY_OTHER_CLOSED 2
354#define TTY_EXCLUSIVE 3
355#define TTY_DO_WRITE_WAKEUP 5
356#define TTY_LDISC_OPEN 11
357#define TTY_PTY_LOCK 16
358#define TTY_NO_WRITE_SPLIT 17
359#define TTY_HUPPED 18
360#define TTY_HUPPING 19
361#define TTY_LDISC_CHANGING 20
362#define TTY_LDISC_HALTED 22
363
364static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
365{
366 return file->f_flags & O_NONBLOCK ||
367 test_bit(TTY_LDISC_CHANGING, &tty->flags);
368}
369
370static inline bool tty_io_error(struct tty_struct *tty)
371{
372 return test_bit(TTY_IO_ERROR, &tty->flags);
373}
374
375static inline bool tty_throttled(struct tty_struct *tty)
376{
377 return test_bit(TTY_THROTTLED, &tty->flags);
378}
379
380#ifdef CONFIG_TTY
381extern void tty_kref_put(struct tty_struct *tty);
382extern struct pid *tty_get_pgrp(struct tty_struct *tty);
383extern void tty_vhangup_self(void);
384extern void disassociate_ctty(int priv);
385extern dev_t tty_devnum(struct tty_struct *tty);
386extern void proc_clear_tty(struct task_struct *p);
387extern struct tty_struct *get_current_tty(void);
388
389extern int __init tty_init(void);
390extern const char *tty_name(const struct tty_struct *tty);
391extern struct tty_struct *tty_kopen_exclusive(dev_t device);
392extern struct tty_struct *tty_kopen_shared(dev_t device);
393extern void tty_kclose(struct tty_struct *tty);
394extern int tty_dev_name_to_number(const char *name, dev_t *number);
395#else
396static inline void tty_kref_put(struct tty_struct *tty)
397{ }
398static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
399{ return NULL; }
400static inline void tty_vhangup_self(void)
401{ }
402static inline void disassociate_ctty(int priv)
403{ }
404static inline dev_t tty_devnum(struct tty_struct *tty)
405{ return 0; }
406static inline void proc_clear_tty(struct task_struct *p)
407{ }
408static inline struct tty_struct *get_current_tty(void)
409{ return NULL; }
410
411static inline int __init tty_init(void)
412{ return 0; }
413static inline const char *tty_name(const struct tty_struct *tty)
414{ return "(none)"; }
415static inline struct tty_struct *tty_kopen_exclusive(dev_t device)
416{ return ERR_PTR(-ENODEV); }
417static inline void tty_kclose(struct tty_struct *tty)
418{ }
419static inline int tty_dev_name_to_number(const char *name, dev_t *number)
420{ return -ENOTSUPP; }
421#endif
422
423extern struct ktermios tty_std_termios;
424
425extern int vcs_init(void);
426
427extern struct class *tty_class;
428
429
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432
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436
437
438static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
439{
440 if (tty)
441 kref_get(&tty->kref);
442 return tty;
443}
444
445extern const char *tty_driver_name(const struct tty_struct *tty);
446extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
447extern void stop_tty(struct tty_struct *tty);
448extern void start_tty(struct tty_struct *tty);
449extern int tty_register_driver(struct tty_driver *driver);
450extern void tty_unregister_driver(struct tty_driver *driver);
451extern struct device *tty_register_device(struct tty_driver *driver,
452 unsigned index, struct device *dev);
453extern struct device *tty_register_device_attr(struct tty_driver *driver,
454 unsigned index, struct device *device,
455 void *drvdata,
456 const struct attribute_group **attr_grp);
457extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
458extern void tty_write_message(struct tty_struct *tty, char *msg);
459extern int tty_send_xchar(struct tty_struct *tty, char ch);
460extern int tty_put_char(struct tty_struct *tty, unsigned char c);
461extern unsigned int tty_chars_in_buffer(struct tty_struct *tty);
462extern unsigned int tty_write_room(struct tty_struct *tty);
463extern void tty_driver_flush_buffer(struct tty_struct *tty);
464extern void tty_unthrottle(struct tty_struct *tty);
465extern int tty_throttle_safe(struct tty_struct *tty);
466extern int tty_unthrottle_safe(struct tty_struct *tty);
467extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
468extern int tty_get_icount(struct tty_struct *tty,
469 struct serial_icounter_struct *icount);
470extern int is_current_pgrp_orphaned(void);
471extern void tty_hangup(struct tty_struct *tty);
472extern void tty_vhangup(struct tty_struct *tty);
473extern int tty_hung_up_p(struct file *filp);
474extern void do_SAK(struct tty_struct *tty);
475extern void __do_SAK(struct tty_struct *tty);
476extern void no_tty(void);
477extern speed_t tty_termios_baud_rate(struct ktermios *termios);
478extern void tty_termios_encode_baud_rate(struct ktermios *termios,
479 speed_t ibaud, speed_t obaud);
480extern void tty_encode_baud_rate(struct tty_struct *tty,
481 speed_t ibaud, speed_t obaud);
482
483
484
485
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489
490
491
492
493static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
494{
495 return tty_termios_baud_rate(&tty->termios);
496}
497
498unsigned char tty_get_char_size(unsigned int cflag);
499unsigned char tty_get_frame_size(unsigned int cflag);
500
501extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
502extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
503extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
504
505extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
506extern void tty_ldisc_deref(struct tty_ldisc *);
507extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
508extern const struct seq_operations tty_ldiscs_seq_ops;
509
510extern void tty_wakeup(struct tty_struct *tty);
511extern void tty_ldisc_flush(struct tty_struct *tty);
512
513extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
514 unsigned int cmd, unsigned long arg);
515extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
516extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
517extern void tty_release_struct(struct tty_struct *tty, int idx);
518extern void tty_init_termios(struct tty_struct *tty);
519extern void tty_save_termios(struct tty_struct *tty);
520extern int tty_standard_install(struct tty_driver *driver,
521 struct tty_struct *tty);
522
523extern struct mutex tty_mutex;
524
525extern void tty_port_init(struct tty_port *port);
526extern void tty_port_link_device(struct tty_port *port,
527 struct tty_driver *driver, unsigned index);
528extern struct device *tty_port_register_device(struct tty_port *port,
529 struct tty_driver *driver, unsigned index,
530 struct device *device);
531extern struct device *tty_port_register_device_attr(struct tty_port *port,
532 struct tty_driver *driver, unsigned index,
533 struct device *device, void *drvdata,
534 const struct attribute_group **attr_grp);
535extern struct device *tty_port_register_device_serdev(struct tty_port *port,
536 struct tty_driver *driver, unsigned index,
537 struct device *device);
538extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
539 struct tty_driver *driver, unsigned index,
540 struct device *device, void *drvdata,
541 const struct attribute_group **attr_grp);
542extern void tty_port_unregister_device(struct tty_port *port,
543 struct tty_driver *driver, unsigned index);
544extern int tty_port_alloc_xmit_buf(struct tty_port *port);
545extern void tty_port_free_xmit_buf(struct tty_port *port);
546extern void tty_port_destroy(struct tty_port *port);
547extern void tty_port_put(struct tty_port *port);
548
549static inline struct tty_port *tty_port_get(struct tty_port *port)
550{
551 if (port && kref_get_unless_zero(&port->kref))
552 return port;
553 return NULL;
554}
555
556
557static inline bool tty_port_cts_enabled(const struct tty_port *port)
558{
559 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
560}
561
562static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
563{
564 assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val);
565}
566
567static inline bool tty_port_active(const struct tty_port *port)
568{
569 return test_bit(TTY_PORT_ACTIVE, &port->iflags);
570}
571
572static inline void tty_port_set_active(struct tty_port *port, bool val)
573{
574 assign_bit(TTY_PORT_ACTIVE, &port->iflags, val);
575}
576
577static inline bool tty_port_check_carrier(const struct tty_port *port)
578{
579 return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
580}
581
582static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
583{
584 assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val);
585}
586
587static inline bool tty_port_suspended(const struct tty_port *port)
588{
589 return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
590}
591
592static inline void tty_port_set_suspended(struct tty_port *port, bool val)
593{
594 assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val);
595}
596
597static inline bool tty_port_initialized(const struct tty_port *port)
598{
599 return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
600}
601
602static inline void tty_port_set_initialized(struct tty_port *port, bool val)
603{
604 assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val);
605}
606
607static inline bool tty_port_kopened(const struct tty_port *port)
608{
609 return test_bit(TTY_PORT_KOPENED, &port->iflags);
610}
611
612static inline void tty_port_set_kopened(struct tty_port *port, bool val)
613{
614 assign_bit(TTY_PORT_KOPENED, &port->iflags, val);
615}
616
617extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
618extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
619extern int tty_port_carrier_raised(struct tty_port *port);
620extern void tty_port_raise_dtr_rts(struct tty_port *port);
621extern void tty_port_lower_dtr_rts(struct tty_port *port);
622extern void tty_port_hangup(struct tty_port *port);
623extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
624extern void tty_port_tty_wakeup(struct tty_port *port);
625extern int tty_port_block_til_ready(struct tty_port *port,
626 struct tty_struct *tty, struct file *filp);
627extern int tty_port_close_start(struct tty_port *port,
628 struct tty_struct *tty, struct file *filp);
629extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
630extern void tty_port_close(struct tty_port *port,
631 struct tty_struct *tty, struct file *filp);
632extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
633 struct tty_struct *tty);
634extern int tty_port_open(struct tty_port *port,
635 struct tty_struct *tty, struct file *filp);
636static inline int tty_port_users(struct tty_port *port)
637{
638 return port->count + port->blocked_open;
639}
640
641extern int tty_register_ldisc(struct tty_ldisc_ops *new_ldisc);
642extern void tty_unregister_ldisc(struct tty_ldisc_ops *ldisc);
643extern int tty_set_ldisc(struct tty_struct *tty, int disc);
644extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
645 const char *f, int count);
646
647
648extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
649#ifdef CONFIG_TTY
650extern void __init n_tty_init(void);
651#else
652static inline void n_tty_init(void) { }
653#endif
654
655
656#ifdef CONFIG_AUDIT
657extern void tty_audit_exit(void);
658extern void tty_audit_fork(struct signal_struct *sig);
659extern int tty_audit_push(void);
660#else
661static inline void tty_audit_exit(void)
662{
663}
664static inline void tty_audit_fork(struct signal_struct *sig)
665{
666}
667static inline int tty_audit_push(void)
668{
669 return 0;
670}
671#endif
672
673
674extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
675 unsigned int cmd, unsigned long arg);
676
677
678
679extern int vt_ioctl(struct tty_struct *tty,
680 unsigned int cmd, unsigned long arg);
681
682extern long vt_compat_ioctl(struct tty_struct *tty,
683 unsigned int cmd, unsigned long arg);
684
685
686
687extern void tty_lock(struct tty_struct *tty);
688extern int tty_lock_interruptible(struct tty_struct *tty);
689extern void tty_unlock(struct tty_struct *tty);
690extern void tty_lock_slave(struct tty_struct *tty);
691extern void tty_unlock_slave(struct tty_struct *tty);
692extern void tty_set_lock_subclass(struct tty_struct *tty);
693
694#ifdef CONFIG_PROC_FS
695extern void proc_tty_register_driver(struct tty_driver *);
696extern void proc_tty_unregister_driver(struct tty_driver *);
697#else
698static inline void proc_tty_register_driver(struct tty_driver *d) {}
699static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
700#endif
701
702#endif
703