1#ifndef _LINUX_TTY_H
2#define _LINUX_TTY_H
3
4#include <linux/fs.h>
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>
15
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35
36enum {
37 TTY_LOCK_NORMAL = 0,
38 TTY_LOCK_SLAVE,
39};
40
41
42
43
44
45#define NR_UNIX98_PTY_DEFAULT 4096
46#define NR_UNIX98_PTY_RESERVE 1024
47#define NR_UNIX98_PTY_MAX (1 << MINORBITS)
48
49
50
51
52
53
54#define __DISABLED_CHAR '\0'
55
56struct tty_buffer {
57 union {
58 struct tty_buffer *next;
59 struct llist_node free;
60 };
61 int used;
62 int size;
63 int commit;
64 int read;
65 int flags;
66
67 unsigned long data[0];
68};
69
70
71#define TTYB_NORMAL 1
72
73static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
74{
75 return ((unsigned char *)b->data) + ofs;
76}
77
78static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
79{
80 return (char *)char_buf_ptr(b, ofs) + b->size;
81}
82
83struct tty_bufhead {
84 struct tty_buffer *head;
85 struct work_struct work;
86 struct mutex lock;
87 atomic_t priority;
88 struct tty_buffer sentinel;
89 struct llist_head free;
90 atomic_t mem_used;
91 int mem_limit;
92 struct tty_buffer *tail;
93};
94
95
96
97
98#define TTY_NORMAL 0
99#define TTY_BREAK 1
100#define TTY_FRAME 2
101#define TTY_PARITY 3
102#define TTY_OVERRUN 4
103
104#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
105#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
106#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
107#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
108#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
109#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
110#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
111#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
112#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
113#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
114#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
115#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
116#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
117#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
118#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
119#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
120#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
121
122#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
123#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
124#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
125#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
126
127#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
128#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
129#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
130#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
131#define I_INPCK(tty) _I_FLAG((tty), INPCK)
132#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
133#define I_INLCR(tty) _I_FLAG((tty), INLCR)
134#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
135#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
136#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
137#define I_IXON(tty) _I_FLAG((tty), IXON)
138#define I_IXANY(tty) _I_FLAG((tty), IXANY)
139#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
140#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
141#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
142
143#define O_OPOST(tty) _O_FLAG((tty), OPOST)
144#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
145#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
146#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
147#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
148#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
149#define O_OFILL(tty) _O_FLAG((tty), OFILL)
150#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
151#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
152#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
153#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
154#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
155#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
156#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
157
158#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
159#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
160#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
161#define C_CREAD(tty) _C_FLAG((tty), CREAD)
162#define C_PARENB(tty) _C_FLAG((tty), PARENB)
163#define C_PARODD(tty) _C_FLAG((tty), PARODD)
164#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
165#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
166#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
167#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
168#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
169
170#define L_ISIG(tty) _L_FLAG((tty), ISIG)
171#define L_ICANON(tty) _L_FLAG((tty), ICANON)
172#define L_XCASE(tty) _L_FLAG((tty), XCASE)
173#define L_ECHO(tty) _L_FLAG((tty), ECHO)
174#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
175#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
176#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
177#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
178#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
179#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
180#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
181#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
182#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
183#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
184#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
185#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
186
187struct device;
188struct signal_struct;
189
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199
200
201struct tty_port;
202
203struct tty_port_operations {
204
205 int (*carrier_raised)(struct tty_port *port);
206
207 void (*dtr_rts)(struct tty_port *port, int raise);
208
209
210
211 void (*shutdown)(struct tty_port *port);
212
213
214
215
216 int (*activate)(struct tty_port *port, struct tty_struct *tty);
217
218 void (*destruct)(struct tty_port *port);
219};
220
221struct tty_port_client_operations {
222 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
223 void (*write_wakeup)(struct tty_port *port);
224};
225
226struct tty_port {
227 struct tty_bufhead buf;
228 struct tty_struct *tty;
229 struct tty_struct *itty;
230 const struct tty_port_operations *ops;
231 const struct tty_port_client_operations *client_ops;
232 spinlock_t lock;
233 int blocked_open;
234 int count;
235 wait_queue_head_t open_wait;
236 wait_queue_head_t delta_msr_wait;
237 unsigned long flags;
238 unsigned long iflags;
239 unsigned char console:1,
240 low_latency:1;
241 struct mutex mutex;
242 struct mutex buf_mutex;
243 unsigned char *xmit_buf;
244 unsigned int close_delay;
245 unsigned int closing_wait;
246 int drain_delay;
247
248
249 struct kref kref;
250 void *client_data;
251};
252
253
254#define TTY_PORT_INITIALIZED 0
255#define TTY_PORT_SUSPENDED 1
256#define TTY_PORT_ACTIVE 2
257
258
259
260
261
262#define TTY_PORT_CTS_FLOW 3
263#define TTY_PORT_CHECK_CD 4
264
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275
276
277struct tty_operations;
278
279struct tty_struct {
280 int magic;
281 struct kref kref;
282 struct device *dev;
283 struct tty_driver *driver;
284 const struct tty_operations *ops;
285 int index;
286
287
288 struct ld_semaphore ldisc_sem;
289 struct tty_ldisc *ldisc;
290
291 struct mutex atomic_write_lock;
292 struct mutex legacy_mutex;
293 struct mutex throttle_mutex;
294 struct rw_semaphore termios_rwsem;
295 struct mutex winsize_mutex;
296 spinlock_t ctrl_lock;
297 spinlock_t flow_lock;
298
299 struct ktermios termios, termios_locked;
300 struct termiox *termiox;
301 char name[64];
302 struct pid *pgrp;
303 struct pid *session;
304 unsigned long flags;
305 int count;
306 struct winsize winsize;
307 unsigned long stopped:1,
308 flow_stopped:1,
309 unused:BITS_PER_LONG - 2;
310 int hw_stopped;
311 unsigned long ctrl_status:8,
312 packet:1,
313 unused_ctrl:BITS_PER_LONG - 9;
314 unsigned int receive_room;
315 int flow_change;
316
317 struct tty_struct *link;
318 struct fasync_struct *fasync;
319 wait_queue_head_t write_wait;
320 wait_queue_head_t read_wait;
321 struct work_struct hangup_work;
322 void *disc_data;
323 void *driver_data;
324 spinlock_t files_lock;
325 struct list_head tty_files;
326
327#define N_TTY_BUF_SIZE 4096
328
329 int closing;
330 unsigned char *write_buf;
331 int write_cnt;
332
333 struct work_struct SAK_work;
334 struct tty_port *port;
335} __randomize_layout;
336
337
338struct tty_file_private {
339 struct tty_struct *tty;
340 struct file *file;
341 struct list_head list;
342};
343
344
345#define TTY_MAGIC 0x5401
346
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353
354
355#define TTY_THROTTLED 0
356#define TTY_IO_ERROR 1
357#define TTY_OTHER_CLOSED 2
358#define TTY_EXCLUSIVE 3
359#define TTY_DO_WRITE_WAKEUP 5
360#define TTY_LDISC_OPEN 11
361#define TTY_PTY_LOCK 16
362#define TTY_NO_WRITE_SPLIT 17
363#define TTY_HUPPED 18
364#define TTY_LDISC_HALTED 22
365
366
367#define TTY_THROTTLE_SAFE 1
368#define TTY_UNTHROTTLE_SAFE 2
369
370static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
371{
372 tty->flow_change = val;
373}
374
375static inline void tty_set_flow_change(struct tty_struct *tty, int val)
376{
377 tty->flow_change = val;
378 smp_mb();
379}
380
381static inline bool tty_io_error(struct tty_struct *tty)
382{
383 return test_bit(TTY_IO_ERROR, &tty->flags);
384}
385
386static inline bool tty_throttled(struct tty_struct *tty)
387{
388 return test_bit(TTY_THROTTLED, &tty->flags);
389}
390
391#ifdef CONFIG_TTY
392extern void tty_kref_put(struct tty_struct *tty);
393extern struct pid *tty_get_pgrp(struct tty_struct *tty);
394extern void tty_vhangup_self(void);
395extern void disassociate_ctty(int priv);
396extern dev_t tty_devnum(struct tty_struct *tty);
397extern void proc_clear_tty(struct task_struct *p);
398extern struct tty_struct *get_current_tty(void);
399
400extern int __init tty_init(void);
401extern const char *tty_name(const struct tty_struct *tty);
402extern struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
403 struct file *filp);
404extern int tty_dev_name_to_number(const char *name, dev_t *number);
405#else
406static inline void tty_kref_put(struct tty_struct *tty)
407{ }
408static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
409{ return NULL; }
410static inline void tty_vhangup_self(void)
411{ }
412static inline void disassociate_ctty(int priv)
413{ }
414static inline dev_t tty_devnum(struct tty_struct *tty)
415{ return 0; }
416static inline void proc_clear_tty(struct task_struct *p)
417{ }
418static inline struct tty_struct *get_current_tty(void)
419{ return NULL; }
420
421static inline int __init tty_init(void)
422{ return 0; }
423static inline const char *tty_name(const struct tty_struct *tty)
424{ return "(none)"; }
425static inline struct tty_struct *tty_open_by_driver(dev_t device,
426 struct inode *inode, struct file *filp)
427{ return NULL; }
428static inline int tty_dev_name_to_number(const char *name, dev_t *number)
429{ return -ENOTSUPP; }
430#endif
431
432extern struct ktermios tty_std_termios;
433
434extern int vcs_init(void);
435
436extern struct class *tty_class;
437
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445
446
447static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
448{
449 if (tty)
450 kref_get(&tty->kref);
451 return tty;
452}
453
454extern const char *tty_driver_name(const struct tty_struct *tty);
455extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
456extern int __tty_check_change(struct tty_struct *tty, int sig);
457extern int tty_check_change(struct tty_struct *tty);
458extern void __stop_tty(struct tty_struct *tty);
459extern void stop_tty(struct tty_struct *tty);
460extern void __start_tty(struct tty_struct *tty);
461extern void start_tty(struct tty_struct *tty);
462extern int tty_register_driver(struct tty_driver *driver);
463extern int tty_unregister_driver(struct tty_driver *driver);
464extern struct device *tty_register_device(struct tty_driver *driver,
465 unsigned index, struct device *dev);
466extern struct device *tty_register_device_attr(struct tty_driver *driver,
467 unsigned index, struct device *device,
468 void *drvdata,
469 const struct attribute_group **attr_grp);
470extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
471extern void tty_write_message(struct tty_struct *tty, char *msg);
472extern int tty_send_xchar(struct tty_struct *tty, char ch);
473extern int tty_put_char(struct tty_struct *tty, unsigned char c);
474extern int tty_chars_in_buffer(struct tty_struct *tty);
475extern int tty_write_room(struct tty_struct *tty);
476extern void tty_driver_flush_buffer(struct tty_struct *tty);
477extern void tty_throttle(struct tty_struct *tty);
478extern void tty_unthrottle(struct tty_struct *tty);
479extern int tty_throttle_safe(struct tty_struct *tty);
480extern int tty_unthrottle_safe(struct tty_struct *tty);
481extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
482extern int is_current_pgrp_orphaned(void);
483extern void tty_hangup(struct tty_struct *tty);
484extern void tty_vhangup(struct tty_struct *tty);
485extern void tty_vhangup_session(struct tty_struct *tty);
486extern int tty_hung_up_p(struct file *filp);
487extern void do_SAK(struct tty_struct *tty);
488extern void __do_SAK(struct tty_struct *tty);
489extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
490extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
491extern void session_clear_tty(struct pid *session);
492extern void no_tty(void);
493extern void tty_buffer_free_all(struct tty_port *port);
494extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
495extern void tty_buffer_init(struct tty_port *port);
496extern void tty_buffer_set_lock_subclass(struct tty_port *port);
497extern bool tty_buffer_restart_work(struct tty_port *port);
498extern bool tty_buffer_cancel_work(struct tty_port *port);
499extern void tty_buffer_flush_work(struct tty_port *port);
500extern speed_t tty_termios_baud_rate(struct ktermios *termios);
501extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
502extern void tty_termios_encode_baud_rate(struct ktermios *termios,
503 speed_t ibaud, speed_t obaud);
504extern void tty_encode_baud_rate(struct tty_struct *tty,
505 speed_t ibaud, speed_t obaud);
506
507
508
509
510
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513
514
515
516
517static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
518{
519 return tty_termios_baud_rate(&tty->termios);
520}
521
522extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
523extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
524extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
525
526extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
527extern void tty_ldisc_deref(struct tty_ldisc *);
528extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
529extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
530extern int tty_ldisc_reinit(struct tty_struct *tty, int disc);
531extern const struct file_operations tty_ldiscs_proc_fops;
532
533extern void tty_wakeup(struct tty_struct *tty);
534extern void tty_ldisc_flush(struct tty_struct *tty);
535
536extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
537extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
538 unsigned int cmd, unsigned long arg);
539extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
540 struct file *file, unsigned int cmd, unsigned long arg);
541extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
542extern void tty_default_fops(struct file_operations *fops);
543extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
544extern int tty_alloc_file(struct file *file);
545extern void tty_add_file(struct tty_struct *tty, struct file *file);
546extern void tty_free_file(struct file *file);
547extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
548extern void tty_release_struct(struct tty_struct *tty, int idx);
549extern int tty_release(struct inode *inode, struct file *filp);
550extern void tty_init_termios(struct tty_struct *tty);
551extern int tty_standard_install(struct tty_driver *driver,
552 struct tty_struct *tty);
553
554extern struct mutex tty_mutex;
555
556#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
557
558extern void tty_port_init(struct tty_port *port);
559extern void tty_port_link_device(struct tty_port *port,
560 struct tty_driver *driver, unsigned index);
561extern struct device *tty_port_register_device(struct tty_port *port,
562 struct tty_driver *driver, unsigned index,
563 struct device *device);
564extern struct device *tty_port_register_device_attr(struct tty_port *port,
565 struct tty_driver *driver, unsigned index,
566 struct device *device, void *drvdata,
567 const struct attribute_group **attr_grp);
568extern struct device *tty_port_register_device_serdev(struct tty_port *port,
569 struct tty_driver *driver, unsigned index,
570 struct device *device);
571extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
572 struct tty_driver *driver, unsigned index,
573 struct device *device, void *drvdata,
574 const struct attribute_group **attr_grp);
575extern void tty_port_unregister_device(struct tty_port *port,
576 struct tty_driver *driver, unsigned index);
577extern int tty_port_alloc_xmit_buf(struct tty_port *port);
578extern void tty_port_free_xmit_buf(struct tty_port *port);
579extern void tty_port_destroy(struct tty_port *port);
580extern void tty_port_put(struct tty_port *port);
581
582static inline struct tty_port *tty_port_get(struct tty_port *port)
583{
584 if (port && kref_get_unless_zero(&port->kref))
585 return port;
586 return NULL;
587}
588
589
590static inline bool tty_port_cts_enabled(struct tty_port *port)
591{
592 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
593}
594
595static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
596{
597 if (val)
598 set_bit(TTY_PORT_CTS_FLOW, &port->iflags);
599 else
600 clear_bit(TTY_PORT_CTS_FLOW, &port->iflags);
601}
602
603static inline bool tty_port_active(struct tty_port *port)
604{
605 return test_bit(TTY_PORT_ACTIVE, &port->iflags);
606}
607
608static inline void tty_port_set_active(struct tty_port *port, bool val)
609{
610 if (val)
611 set_bit(TTY_PORT_ACTIVE, &port->iflags);
612 else
613 clear_bit(TTY_PORT_ACTIVE, &port->iflags);
614}
615
616static inline bool tty_port_check_carrier(struct tty_port *port)
617{
618 return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
619}
620
621static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
622{
623 if (val)
624 set_bit(TTY_PORT_CHECK_CD, &port->iflags);
625 else
626 clear_bit(TTY_PORT_CHECK_CD, &port->iflags);
627}
628
629static inline bool tty_port_suspended(struct tty_port *port)
630{
631 return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
632}
633
634static inline void tty_port_set_suspended(struct tty_port *port, bool val)
635{
636 if (val)
637 set_bit(TTY_PORT_SUSPENDED, &port->iflags);
638 else
639 clear_bit(TTY_PORT_SUSPENDED, &port->iflags);
640}
641
642static inline bool tty_port_initialized(struct tty_port *port)
643{
644 return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
645}
646
647static inline void tty_port_set_initialized(struct tty_port *port, bool val)
648{
649 if (val)
650 set_bit(TTY_PORT_INITIALIZED, &port->iflags);
651 else
652 clear_bit(TTY_PORT_INITIALIZED, &port->iflags);
653}
654
655extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
656extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
657extern int tty_port_carrier_raised(struct tty_port *port);
658extern void tty_port_raise_dtr_rts(struct tty_port *port);
659extern void tty_port_lower_dtr_rts(struct tty_port *port);
660extern void tty_port_hangup(struct tty_port *port);
661extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
662extern void tty_port_tty_wakeup(struct tty_port *port);
663extern int tty_port_block_til_ready(struct tty_port *port,
664 struct tty_struct *tty, struct file *filp);
665extern int tty_port_close_start(struct tty_port *port,
666 struct tty_struct *tty, struct file *filp);
667extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
668extern void tty_port_close(struct tty_port *port,
669 struct tty_struct *tty, struct file *filp);
670extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
671 struct tty_struct *tty);
672extern int tty_port_open(struct tty_port *port,
673 struct tty_struct *tty, struct file *filp);
674static inline int tty_port_users(struct tty_port *port)
675{
676 return port->count + port->blocked_open;
677}
678
679extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
680extern int tty_unregister_ldisc(int disc);
681extern int tty_set_ldisc(struct tty_struct *tty, int disc);
682extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
683extern void tty_ldisc_release(struct tty_struct *tty);
684extern void tty_ldisc_init(struct tty_struct *tty);
685extern void tty_ldisc_deinit(struct tty_struct *tty);
686extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
687 char *f, int count);
688
689
690extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
691#ifdef CONFIG_TTY
692extern void __init n_tty_init(void);
693#else
694static inline void n_tty_init(void) { }
695#endif
696
697
698#ifdef CONFIG_AUDIT
699extern void tty_audit_add_data(struct tty_struct *tty, const void *data,
700 size_t size);
701extern void tty_audit_exit(void);
702extern void tty_audit_fork(struct signal_struct *sig);
703extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
704extern int tty_audit_push(void);
705#else
706static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
707 size_t size)
708{
709}
710static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
711{
712}
713static inline void tty_audit_exit(void)
714{
715}
716static inline void tty_audit_fork(struct signal_struct *sig)
717{
718}
719static inline int tty_audit_push(void)
720{
721 return 0;
722}
723#endif
724
725
726extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
727 unsigned int cmd, unsigned long arg);
728extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
729 unsigned int cmd, unsigned long arg);
730
731
732
733extern int vt_ioctl(struct tty_struct *tty,
734 unsigned int cmd, unsigned long arg);
735
736extern long vt_compat_ioctl(struct tty_struct *tty,
737 unsigned int cmd, unsigned long arg);
738
739
740
741extern void tty_lock(struct tty_struct *tty);
742extern int tty_lock_interruptible(struct tty_struct *tty);
743extern void tty_unlock(struct tty_struct *tty);
744extern void tty_lock_slave(struct tty_struct *tty);
745extern void tty_unlock_slave(struct tty_struct *tty);
746extern void tty_set_lock_subclass(struct tty_struct *tty);
747
748#ifdef CONFIG_PROC_FS
749extern void proc_tty_register_driver(struct tty_driver *);
750extern void proc_tty_unregister_driver(struct tty_driver *);
751#else
752static inline void proc_tty_register_driver(struct tty_driver *d) {}
753static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
754#endif
755
756#define tty_msg(fn, tty, f, ...) \
757 fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__)
758
759#define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__)
760#define tty_info(tty, f, ...) tty_msg(pr_info, tty, f, ##__VA_ARGS__)
761#define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__)
762#define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__)
763#define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__)
764
765#define tty_info_ratelimited(tty, f, ...) \
766 tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__)
767
768#endif
769