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 <uapi/linux/tty.h>
14#include <linux/rwsem.h>
15#include <linux/llist.h>
16
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36
37enum {
38 TTY_LOCK_NORMAL = 0,
39 TTY_LOCK_SLAVE,
40};
41
42
43
44
45
46#define NR_UNIX98_PTY_DEFAULT 4096
47#define NR_UNIX98_PTY_RESERVE 1024
48#define NR_UNIX98_PTY_MAX (1 << MINORBITS)
49
50
51
52
53
54
55#define __DISABLED_CHAR '\0'
56
57struct tty_buffer {
58 union {
59 struct tty_buffer *next;
60 struct llist_node free;
61 };
62 int used;
63 int size;
64 int commit;
65 int read;
66 int flags;
67
68 unsigned long data[0];
69};
70
71
72#define TTYB_NORMAL 1
73
74static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
75{
76 return ((unsigned char *)b->data) + ofs;
77}
78
79static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
80{
81 return (char *)char_buf_ptr(b, ofs) + b->size;
82}
83
84struct tty_bufhead {
85 struct tty_buffer *head;
86 struct work_struct work;
87 struct mutex lock;
88 atomic_t priority;
89 struct tty_buffer sentinel;
90 struct llist_head free;
91 atomic_t mem_used;
92 int mem_limit;
93 struct tty_buffer *tail;
94};
95
96
97
98
99#define TTY_NORMAL 0
100#define TTY_BREAK 1
101#define TTY_FRAME 2
102#define TTY_PARITY 3
103#define TTY_OVERRUN 4
104
105#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
106#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
107#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
108#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
109#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
110#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
111#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
112#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
113#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
114#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
115#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
116#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
117#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
118#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
119#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
120#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
121#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
122
123#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
124#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
125#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
126#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
127
128#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
129#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
130#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
131#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
132#define I_INPCK(tty) _I_FLAG((tty), INPCK)
133#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
134#define I_INLCR(tty) _I_FLAG((tty), INLCR)
135#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
136#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
137#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
138#define I_IXON(tty) _I_FLAG((tty), IXON)
139#define I_IXANY(tty) _I_FLAG((tty), IXANY)
140#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
141#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
142#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
143
144#define O_OPOST(tty) _O_FLAG((tty), OPOST)
145#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
146#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
147#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
148#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
149#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
150#define O_OFILL(tty) _O_FLAG((tty), OFILL)
151#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
152#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
153#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
154#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
155#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
156#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
157#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
158
159#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
160#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
161#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
162#define C_CREAD(tty) _C_FLAG((tty), CREAD)
163#define C_PARENB(tty) _C_FLAG((tty), PARENB)
164#define C_PARODD(tty) _C_FLAG((tty), PARODD)
165#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
166#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
167#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
168#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
169#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
170
171#define L_ISIG(tty) _L_FLAG((tty), ISIG)
172#define L_ICANON(tty) _L_FLAG((tty), ICANON)
173#define L_XCASE(tty) _L_FLAG((tty), XCASE)
174#define L_ECHO(tty) _L_FLAG((tty), ECHO)
175#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
176#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
177#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
178#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
179#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
180#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
181#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
182#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
183#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
184#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
185#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
186#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
187
188struct device;
189struct signal_struct;
190
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200
201
202struct tty_port;
203
204struct tty_port_operations {
205
206 int (*carrier_raised)(struct tty_port *port);
207
208 void (*dtr_rts)(struct tty_port *port, int raise);
209
210
211
212 void (*shutdown)(struct tty_port *port);
213
214
215
216
217 int (*activate)(struct tty_port *port, struct tty_struct *tty);
218
219 void (*destruct)(struct tty_port *port);
220};
221
222struct tty_port_client_operations {
223 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
224 void (*write_wakeup)(struct tty_port *port);
225};
226
227struct tty_port {
228 struct tty_bufhead buf;
229 struct tty_struct *tty;
230 struct tty_struct *itty;
231 const struct tty_port_operations *ops;
232 const struct tty_port_client_operations *client_ops;
233 spinlock_t lock;
234 int blocked_open;
235 int count;
236 wait_queue_head_t open_wait;
237 wait_queue_head_t delta_msr_wait;
238 unsigned long flags;
239 unsigned long iflags;
240 unsigned char console:1,
241 low_latency:1;
242 struct mutex mutex;
243 struct mutex buf_mutex;
244 unsigned char *xmit_buf;
245 unsigned int close_delay;
246 unsigned int closing_wait;
247 int drain_delay;
248
249
250 struct kref kref;
251 void *client_data;
252};
253
254
255#define TTY_PORT_INITIALIZED 0
256#define TTY_PORT_SUSPENDED 1
257#define TTY_PORT_ACTIVE 2
258
259
260
261
262
263#define TTY_PORT_CTS_FLOW 3
264#define TTY_PORT_CHECK_CD 4
265#define TTY_PORT_KOPENED 5
266
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278
279
280struct tty_operations;
281
282struct tty_struct {
283 int magic;
284 struct kref kref;
285 struct device *dev;
286 struct tty_driver *driver;
287 const struct tty_operations *ops;
288 int index;
289
290
291 struct ld_semaphore ldisc_sem;
292 struct tty_ldisc *ldisc;
293
294 struct mutex atomic_write_lock;
295 struct mutex legacy_mutex;
296 struct mutex throttle_mutex;
297 struct rw_semaphore termios_rwsem;
298 struct mutex winsize_mutex;
299 spinlock_t ctrl_lock;
300 spinlock_t flow_lock;
301
302 struct ktermios termios, termios_locked;
303 struct termiox *termiox;
304 char name[64];
305 struct pid *pgrp;
306 struct pid *session;
307 unsigned long flags;
308 int count;
309 struct winsize winsize;
310 unsigned long stopped:1,
311 flow_stopped:1,
312 unused:BITS_PER_LONG - 2;
313 int hw_stopped;
314 unsigned long ctrl_status:8,
315 packet:1,
316 unused_ctrl:BITS_PER_LONG - 9;
317 unsigned int receive_room;
318 int flow_change;
319
320 struct tty_struct *link;
321 struct fasync_struct *fasync;
322 wait_queue_head_t write_wait;
323 wait_queue_head_t read_wait;
324 struct work_struct hangup_work;
325 void *disc_data;
326 void *driver_data;
327 spinlock_t files_lock;
328 struct list_head tty_files;
329
330#define N_TTY_BUF_SIZE 4096
331
332 int closing;
333 unsigned char *write_buf;
334 int write_cnt;
335
336 struct work_struct SAK_work;
337 struct tty_port *port;
338} __randomize_layout;
339
340
341struct tty_file_private {
342 struct tty_struct *tty;
343 struct file *file;
344 struct list_head list;
345};
346
347
348#define TTY_MAGIC 0x5401
349
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351
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355
356
357
358#define TTY_THROTTLED 0
359#define TTY_IO_ERROR 1
360#define TTY_OTHER_CLOSED 2
361#define TTY_EXCLUSIVE 3
362#define TTY_DO_WRITE_WAKEUP 5
363#define TTY_LDISC_OPEN 11
364#define TTY_PTY_LOCK 16
365#define TTY_NO_WRITE_SPLIT 17
366#define TTY_HUPPED 18
367#define TTY_HUPPING 19
368#define TTY_LDISC_HALTED 22
369
370
371#define TTY_THROTTLE_SAFE 1
372#define TTY_UNTHROTTLE_SAFE 2
373
374static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
375{
376 tty->flow_change = val;
377}
378
379static inline void tty_set_flow_change(struct tty_struct *tty, int val)
380{
381 tty->flow_change = val;
382 smp_mb();
383}
384
385static inline bool tty_io_error(struct tty_struct *tty)
386{
387 return test_bit(TTY_IO_ERROR, &tty->flags);
388}
389
390static inline bool tty_throttled(struct tty_struct *tty)
391{
392 return test_bit(TTY_THROTTLED, &tty->flags);
393}
394
395#ifdef CONFIG_TTY
396extern void tty_kref_put(struct tty_struct *tty);
397extern struct pid *tty_get_pgrp(struct tty_struct *tty);
398extern void tty_vhangup_self(void);
399extern void disassociate_ctty(int priv);
400extern dev_t tty_devnum(struct tty_struct *tty);
401extern void proc_clear_tty(struct task_struct *p);
402extern struct tty_struct *get_current_tty(void);
403
404extern int __init tty_init(void);
405extern const char *tty_name(const struct tty_struct *tty);
406extern struct tty_struct *tty_kopen(dev_t device);
407extern void tty_kclose(struct tty_struct *tty);
408extern int tty_dev_name_to_number(const char *name, dev_t *number);
409extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
410extern void tty_ldisc_unlock(struct tty_struct *tty);
411#else
412static inline void tty_kref_put(struct tty_struct *tty)
413{ }
414static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
415{ return NULL; }
416static inline void tty_vhangup_self(void)
417{ }
418static inline void disassociate_ctty(int priv)
419{ }
420static inline dev_t tty_devnum(struct tty_struct *tty)
421{ return 0; }
422static inline void proc_clear_tty(struct task_struct *p)
423{ }
424static inline struct tty_struct *get_current_tty(void)
425{ return NULL; }
426
427static inline int __init tty_init(void)
428{ return 0; }
429static inline const char *tty_name(const struct tty_struct *tty)
430{ return "(none)"; }
431static inline struct tty_struct *tty_kopen(dev_t device)
432{ return ERR_PTR(-ENODEV); }
433static inline void tty_kclose(struct tty_struct *tty)
434{ }
435static inline int tty_dev_name_to_number(const char *name, dev_t *number)
436{ return -ENOTSUPP; }
437#endif
438
439extern struct ktermios tty_std_termios;
440
441extern int vcs_init(void);
442
443extern struct class *tty_class;
444
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452
453
454static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
455{
456 if (tty)
457 kref_get(&tty->kref);
458 return tty;
459}
460
461extern const char *tty_driver_name(const struct tty_struct *tty);
462extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
463extern int __tty_check_change(struct tty_struct *tty, int sig);
464extern int tty_check_change(struct tty_struct *tty);
465extern void __stop_tty(struct tty_struct *tty);
466extern void stop_tty(struct tty_struct *tty);
467extern void __start_tty(struct tty_struct *tty);
468extern void start_tty(struct tty_struct *tty);
469extern int tty_register_driver(struct tty_driver *driver);
470extern int tty_unregister_driver(struct tty_driver *driver);
471extern struct device *tty_register_device(struct tty_driver *driver,
472 unsigned index, struct device *dev);
473extern struct device *tty_register_device_attr(struct tty_driver *driver,
474 unsigned index, struct device *device,
475 void *drvdata,
476 const struct attribute_group **attr_grp);
477extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
478extern void tty_write_message(struct tty_struct *tty, char *msg);
479extern int tty_send_xchar(struct tty_struct *tty, char ch);
480extern int tty_put_char(struct tty_struct *tty, unsigned char c);
481extern int tty_chars_in_buffer(struct tty_struct *tty);
482extern int tty_write_room(struct tty_struct *tty);
483extern void tty_driver_flush_buffer(struct tty_struct *tty);
484extern void tty_throttle(struct tty_struct *tty);
485extern void tty_unthrottle(struct tty_struct *tty);
486extern int tty_throttle_safe(struct tty_struct *tty);
487extern int tty_unthrottle_safe(struct tty_struct *tty);
488extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
489extern int is_current_pgrp_orphaned(void);
490extern void tty_hangup(struct tty_struct *tty);
491extern void tty_vhangup(struct tty_struct *tty);
492extern void tty_vhangup_session(struct tty_struct *tty);
493extern int tty_hung_up_p(struct file *filp);
494extern void do_SAK(struct tty_struct *tty);
495extern void __do_SAK(struct tty_struct *tty);
496extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
497extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
498extern void session_clear_tty(struct pid *session);
499extern void no_tty(void);
500extern void tty_buffer_free_all(struct tty_port *port);
501extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
502extern void tty_buffer_init(struct tty_port *port);
503extern void tty_buffer_set_lock_subclass(struct tty_port *port);
504extern bool tty_buffer_restart_work(struct tty_port *port);
505extern bool tty_buffer_cancel_work(struct tty_port *port);
506extern void tty_buffer_flush_work(struct tty_port *port);
507extern speed_t tty_termios_baud_rate(struct ktermios *termios);
508extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
509extern void tty_termios_encode_baud_rate(struct ktermios *termios,
510 speed_t ibaud, speed_t obaud);
511extern void tty_encode_baud_rate(struct tty_struct *tty,
512 speed_t ibaud, speed_t obaud);
513
514
515
516
517
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519
520
521
522
523
524static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
525{
526 return tty_termios_baud_rate(&tty->termios);
527}
528
529extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
530extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
531extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
532
533extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
534extern void tty_ldisc_deref(struct tty_ldisc *);
535extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
536extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
537extern int tty_ldisc_reinit(struct tty_struct *tty, int disc);
538extern const struct file_operations tty_ldiscs_proc_fops;
539
540extern void tty_wakeup(struct tty_struct *tty);
541extern void tty_ldisc_flush(struct tty_struct *tty);
542
543extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
544extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
545 unsigned int cmd, unsigned long arg);
546extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
547 struct file *file, unsigned int cmd, unsigned long arg);
548extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
549extern void tty_default_fops(struct file_operations *fops);
550extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
551extern int tty_alloc_file(struct file *file);
552extern void tty_add_file(struct tty_struct *tty, struct file *file);
553extern void tty_free_file(struct file *file);
554extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
555extern void tty_release_struct(struct tty_struct *tty, int idx);
556extern int tty_release(struct inode *inode, struct file *filp);
557extern void tty_init_termios(struct tty_struct *tty);
558extern int tty_standard_install(struct tty_driver *driver,
559 struct tty_struct *tty);
560
561extern struct mutex tty_mutex;
562
563#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
564
565extern void tty_port_init(struct tty_port *port);
566extern void tty_port_link_device(struct tty_port *port,
567 struct tty_driver *driver, unsigned index);
568extern struct device *tty_port_register_device(struct tty_port *port,
569 struct tty_driver *driver, unsigned index,
570 struct device *device);
571extern struct device *tty_port_register_device_attr(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 struct device *tty_port_register_device_serdev(struct tty_port *port,
576 struct tty_driver *driver, unsigned index,
577 struct device *device);
578extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
579 struct tty_driver *driver, unsigned index,
580 struct device *device, void *drvdata,
581 const struct attribute_group **attr_grp);
582extern void tty_port_unregister_device(struct tty_port *port,
583 struct tty_driver *driver, unsigned index);
584extern int tty_port_alloc_xmit_buf(struct tty_port *port);
585extern void tty_port_free_xmit_buf(struct tty_port *port);
586extern void tty_port_destroy(struct tty_port *port);
587extern void tty_port_put(struct tty_port *port);
588
589static inline struct tty_port *tty_port_get(struct tty_port *port)
590{
591 if (port && kref_get_unless_zero(&port->kref))
592 return port;
593 return NULL;
594}
595
596
597static inline bool tty_port_cts_enabled(struct tty_port *port)
598{
599 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
600}
601
602static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
603{
604 if (val)
605 set_bit(TTY_PORT_CTS_FLOW, &port->iflags);
606 else
607 clear_bit(TTY_PORT_CTS_FLOW, &port->iflags);
608}
609
610static inline bool tty_port_active(struct tty_port *port)
611{
612 return test_bit(TTY_PORT_ACTIVE, &port->iflags);
613}
614
615static inline void tty_port_set_active(struct tty_port *port, bool val)
616{
617 if (val)
618 set_bit(TTY_PORT_ACTIVE, &port->iflags);
619 else
620 clear_bit(TTY_PORT_ACTIVE, &port->iflags);
621}
622
623static inline bool tty_port_check_carrier(struct tty_port *port)
624{
625 return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
626}
627
628static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
629{
630 if (val)
631 set_bit(TTY_PORT_CHECK_CD, &port->iflags);
632 else
633 clear_bit(TTY_PORT_CHECK_CD, &port->iflags);
634}
635
636static inline bool tty_port_suspended(struct tty_port *port)
637{
638 return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
639}
640
641static inline void tty_port_set_suspended(struct tty_port *port, bool val)
642{
643 if (val)
644 set_bit(TTY_PORT_SUSPENDED, &port->iflags);
645 else
646 clear_bit(TTY_PORT_SUSPENDED, &port->iflags);
647}
648
649static inline bool tty_port_initialized(struct tty_port *port)
650{
651 return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
652}
653
654static inline void tty_port_set_initialized(struct tty_port *port, bool val)
655{
656 if (val)
657 set_bit(TTY_PORT_INITIALIZED, &port->iflags);
658 else
659 clear_bit(TTY_PORT_INITIALIZED, &port->iflags);
660}
661
662static inline bool tty_port_kopened(struct tty_port *port)
663{
664 return test_bit(TTY_PORT_KOPENED, &port->iflags);
665}
666
667static inline void tty_port_set_kopened(struct tty_port *port, bool val)
668{
669 if (val)
670 set_bit(TTY_PORT_KOPENED, &port->iflags);
671 else
672 clear_bit(TTY_PORT_KOPENED, &port->iflags);
673}
674
675extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
676extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
677extern int tty_port_carrier_raised(struct tty_port *port);
678extern void tty_port_raise_dtr_rts(struct tty_port *port);
679extern void tty_port_lower_dtr_rts(struct tty_port *port);
680extern void tty_port_hangup(struct tty_port *port);
681extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
682extern void tty_port_tty_wakeup(struct tty_port *port);
683extern int tty_port_block_til_ready(struct tty_port *port,
684 struct tty_struct *tty, struct file *filp);
685extern int tty_port_close_start(struct tty_port *port,
686 struct tty_struct *tty, struct file *filp);
687extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
688extern void tty_port_close(struct tty_port *port,
689 struct tty_struct *tty, struct file *filp);
690extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
691 struct tty_struct *tty);
692extern int tty_port_open(struct tty_port *port,
693 struct tty_struct *tty, struct file *filp);
694static inline int tty_port_users(struct tty_port *port)
695{
696 return port->count + port->blocked_open;
697}
698
699extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
700extern int tty_unregister_ldisc(int disc);
701extern int tty_set_ldisc(struct tty_struct *tty, int disc);
702extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
703extern void tty_ldisc_release(struct tty_struct *tty);
704extern void tty_ldisc_init(struct tty_struct *tty);
705extern void tty_ldisc_deinit(struct tty_struct *tty);
706extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
707 char *f, int count);
708
709
710extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
711#ifdef CONFIG_TTY
712extern void __init n_tty_init(void);
713#else
714static inline void n_tty_init(void) { }
715#endif
716
717
718#ifdef CONFIG_AUDIT
719extern void tty_audit_add_data(struct tty_struct *tty, const void *data,
720 size_t size);
721extern void tty_audit_exit(void);
722extern void tty_audit_fork(struct signal_struct *sig);
723extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
724extern int tty_audit_push(void);
725#else
726static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
727 size_t size)
728{
729}
730static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
731{
732}
733static inline void tty_audit_exit(void)
734{
735}
736static inline void tty_audit_fork(struct signal_struct *sig)
737{
738}
739static inline int tty_audit_push(void)
740{
741 return 0;
742}
743#endif
744
745
746extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
747 unsigned int cmd, unsigned long arg);
748extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
749 unsigned int cmd, unsigned long arg);
750
751
752
753extern int vt_ioctl(struct tty_struct *tty,
754 unsigned int cmd, unsigned long arg);
755
756extern long vt_compat_ioctl(struct tty_struct *tty,
757 unsigned int cmd, unsigned long arg);
758
759
760
761extern void tty_lock(struct tty_struct *tty);
762extern int tty_lock_interruptible(struct tty_struct *tty);
763extern void tty_unlock(struct tty_struct *tty);
764extern void tty_lock_slave(struct tty_struct *tty);
765extern void tty_unlock_slave(struct tty_struct *tty);
766extern void tty_set_lock_subclass(struct tty_struct *tty);
767
768#ifdef CONFIG_PROC_FS
769extern void proc_tty_register_driver(struct tty_driver *);
770extern void proc_tty_unregister_driver(struct tty_driver *);
771#else
772static inline void proc_tty_register_driver(struct tty_driver *d) {}
773static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
774#endif
775
776#define tty_msg(fn, tty, f, ...) \
777 fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__)
778
779#define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__)
780#define tty_info(tty, f, ...) tty_msg(pr_info, tty, f, ##__VA_ARGS__)
781#define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__)
782#define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__)
783#define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__)
784
785#define tty_info_ratelimited(tty, f, ...) \
786 tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__)
787
788#endif
789