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
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38enum {
39 TTY_LOCK_NORMAL = 0,
40 TTY_LOCK_SLAVE,
41};
42
43
44
45
46
47#define NR_UNIX98_PTY_DEFAULT 4096
48#define NR_UNIX98_PTY_RESERVE 1024
49#define NR_UNIX98_PTY_MAX (1 << MINORBITS)
50
51
52
53
54
55
56#define __DISABLED_CHAR '\0'
57
58struct tty_buffer {
59 union {
60 struct tty_buffer *next;
61 struct llist_node free;
62 };
63 int used;
64 int size;
65 int commit;
66 int read;
67 int flags;
68
69 unsigned long data[];
70};
71
72
73#define TTYB_NORMAL 1
74
75static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
76{
77 return ((unsigned char *)b->data) + ofs;
78}
79
80static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
81{
82 return (char *)char_buf_ptr(b, ofs) + b->size;
83}
84
85struct tty_bufhead {
86 struct tty_buffer *head;
87 struct work_struct work;
88 struct mutex lock;
89 atomic_t priority;
90 struct tty_buffer sentinel;
91 struct llist_head free;
92 atomic_t mem_used;
93 int mem_limit;
94 struct tty_buffer *tail;
95};
96
97
98
99
100#define TTY_NORMAL 0
101#define TTY_BREAK 1
102#define TTY_FRAME 2
103#define TTY_PARITY 3
104#define TTY_OVERRUN 4
105
106#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
107#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
108#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
109#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
110#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
111#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
112#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
113#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
114#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
115#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
116#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
117#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
118#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
119#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
120#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
121#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
122#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
123
124#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
125#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
126#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
127#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
128
129#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
130#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
131#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
132#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
133#define I_INPCK(tty) _I_FLAG((tty), INPCK)
134#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
135#define I_INLCR(tty) _I_FLAG((tty), INLCR)
136#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
137#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
138#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
139#define I_IXON(tty) _I_FLAG((tty), IXON)
140#define I_IXANY(tty) _I_FLAG((tty), IXANY)
141#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
142#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
143#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
144
145#define O_OPOST(tty) _O_FLAG((tty), OPOST)
146#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
147#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
148#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
149#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
150#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
151#define O_OFILL(tty) _O_FLAG((tty), OFILL)
152#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
153#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
154#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
155#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
156#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
157#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
158#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
159
160#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
161#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
162#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
163#define C_CREAD(tty) _C_FLAG((tty), CREAD)
164#define C_PARENB(tty) _C_FLAG((tty), PARENB)
165#define C_PARODD(tty) _C_FLAG((tty), PARODD)
166#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
167#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
168#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
169#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
170#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
171
172#define L_ISIG(tty) _L_FLAG((tty), ISIG)
173#define L_ICANON(tty) _L_FLAG((tty), ICANON)
174#define L_XCASE(tty) _L_FLAG((tty), XCASE)
175#define L_ECHO(tty) _L_FLAG((tty), ECHO)
176#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
177#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
178#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
179#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
180#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
181#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
182#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
183#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
184#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
185#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
186#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
187#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
188
189struct device;
190struct signal_struct;
191
192
193
194
195
196
197
198
199
200
201
202
203struct tty_port;
204
205struct tty_port_operations {
206
207 int (*carrier_raised)(struct tty_port *port);
208
209 void (*dtr_rts)(struct tty_port *port, int raise);
210
211
212
213 void (*shutdown)(struct tty_port *port);
214
215
216
217
218 int (*activate)(struct tty_port *port, struct tty_struct *tty);
219
220 void (*destruct)(struct tty_port *port);
221};
222
223struct tty_port_client_operations {
224 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
225 void (*write_wakeup)(struct tty_port *port);
226};
227
228extern const struct tty_port_client_operations tty_port_default_client_ops;
229
230struct tty_port {
231 struct tty_bufhead buf;
232 struct tty_struct *tty;
233 struct tty_struct *itty;
234 const struct tty_port_operations *ops;
235 const struct tty_port_client_operations *client_ops;
236 spinlock_t lock;
237 int blocked_open;
238 int count;
239 wait_queue_head_t open_wait;
240 wait_queue_head_t delta_msr_wait;
241 unsigned long flags;
242 unsigned long iflags;
243 unsigned char console:1,
244 low_latency:1;
245 struct mutex mutex;
246 struct mutex buf_mutex;
247 unsigned char *xmit_buf;
248 unsigned int close_delay;
249 unsigned int closing_wait;
250 int drain_delay;
251
252
253 struct kref kref;
254 void *client_data;
255};
256
257
258#define TTY_PORT_INITIALIZED 0
259#define TTY_PORT_SUSPENDED 1
260#define TTY_PORT_ACTIVE 2
261
262
263
264
265
266#define TTY_PORT_CTS_FLOW 3
267#define TTY_PORT_CHECK_CD 4
268#define TTY_PORT_KOPENED 5
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283struct tty_operations;
284
285struct tty_struct {
286 int magic;
287 struct kref kref;
288 struct device *dev;
289 struct tty_driver *driver;
290 const struct tty_operations *ops;
291 int index;
292
293
294 struct ld_semaphore ldisc_sem;
295 struct tty_ldisc *ldisc;
296
297 struct mutex atomic_write_lock;
298 struct mutex legacy_mutex;
299 struct mutex throttle_mutex;
300 struct rw_semaphore termios_rwsem;
301 struct mutex winsize_mutex;
302 spinlock_t ctrl_lock;
303 spinlock_t flow_lock;
304
305 struct ktermios termios, termios_locked;
306 struct termiox *termiox;
307 char name[64];
308 struct pid *pgrp;
309 struct pid *session;
310 unsigned long flags;
311 int count;
312 struct winsize winsize;
313 unsigned long stopped:1,
314 flow_stopped:1,
315 unused:BITS_PER_LONG - 2;
316 int hw_stopped;
317 unsigned long ctrl_status:8,
318 packet:1,
319 unused_ctrl:BITS_PER_LONG - 9;
320 unsigned int receive_room;
321 int flow_change;
322
323 struct tty_struct *link;
324 struct fasync_struct *fasync;
325 wait_queue_head_t write_wait;
326 wait_queue_head_t read_wait;
327 struct work_struct hangup_work;
328 void *disc_data;
329 void *driver_data;
330 spinlock_t files_lock;
331 struct list_head tty_files;
332
333#define N_TTY_BUF_SIZE 4096
334
335 int closing;
336 unsigned char *write_buf;
337 int write_cnt;
338
339 struct work_struct SAK_work;
340 struct tty_port *port;
341} __randomize_layout;
342
343
344struct tty_file_private {
345 struct tty_struct *tty;
346 struct file *file;
347 struct list_head list;
348};
349
350
351#define TTY_MAGIC 0x5401
352
353
354
355
356
357
358
359
360
361#define TTY_THROTTLED 0
362#define TTY_IO_ERROR 1
363#define TTY_OTHER_CLOSED 2
364#define TTY_EXCLUSIVE 3
365#define TTY_DO_WRITE_WAKEUP 5
366#define TTY_LDISC_OPEN 11
367#define TTY_PTY_LOCK 16
368#define TTY_NO_WRITE_SPLIT 17
369#define TTY_HUPPED 18
370#define TTY_HUPPING 19
371#define TTY_LDISC_CHANGING 20
372#define TTY_LDISC_HALTED 22
373
374
375#define TTY_THROTTLE_SAFE 1
376#define TTY_UNTHROTTLE_SAFE 2
377
378static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
379{
380 tty->flow_change = val;
381}
382
383static inline void tty_set_flow_change(struct tty_struct *tty, int val)
384{
385 tty->flow_change = val;
386 smp_mb();
387}
388
389static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
390{
391 return file->f_flags & O_NONBLOCK ||
392 test_bit(TTY_LDISC_CHANGING, &tty->flags);
393}
394
395static inline bool tty_io_error(struct tty_struct *tty)
396{
397 return test_bit(TTY_IO_ERROR, &tty->flags);
398}
399
400static inline bool tty_throttled(struct tty_struct *tty)
401{
402 return test_bit(TTY_THROTTLED, &tty->flags);
403}
404
405#ifdef CONFIG_TTY
406extern void tty_kref_put(struct tty_struct *tty);
407extern struct pid *tty_get_pgrp(struct tty_struct *tty);
408extern void tty_vhangup_self(void);
409extern void disassociate_ctty(int priv);
410extern dev_t tty_devnum(struct tty_struct *tty);
411extern void proc_clear_tty(struct task_struct *p);
412extern struct tty_struct *get_current_tty(void);
413
414extern int __init tty_init(void);
415extern const char *tty_name(const struct tty_struct *tty);
416extern struct tty_struct *tty_kopen(dev_t device);
417extern void tty_kclose(struct tty_struct *tty);
418extern int tty_dev_name_to_number(const char *name, dev_t *number);
419extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
420extern void tty_ldisc_unlock(struct tty_struct *tty);
421#else
422static inline void tty_kref_put(struct tty_struct *tty)
423{ }
424static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
425{ return NULL; }
426static inline void tty_vhangup_self(void)
427{ }
428static inline void disassociate_ctty(int priv)
429{ }
430static inline dev_t tty_devnum(struct tty_struct *tty)
431{ return 0; }
432static inline void proc_clear_tty(struct task_struct *p)
433{ }
434static inline struct tty_struct *get_current_tty(void)
435{ return NULL; }
436
437static inline int __init tty_init(void)
438{ return 0; }
439static inline const char *tty_name(const struct tty_struct *tty)
440{ return "(none)"; }
441static inline struct tty_struct *tty_kopen(dev_t device)
442{ return ERR_PTR(-ENODEV); }
443static inline void tty_kclose(struct tty_struct *tty)
444{ }
445static inline int tty_dev_name_to_number(const char *name, dev_t *number)
446{ return -ENOTSUPP; }
447#endif
448
449extern struct ktermios tty_std_termios;
450
451extern int vcs_init(void);
452
453extern struct class *tty_class;
454
455
456
457
458
459
460
461
462
463
464static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
465{
466 if (tty)
467 kref_get(&tty->kref);
468 return tty;
469}
470
471extern const char *tty_driver_name(const struct tty_struct *tty);
472extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
473extern int __tty_check_change(struct tty_struct *tty, int sig);
474extern int tty_check_change(struct tty_struct *tty);
475extern void __stop_tty(struct tty_struct *tty);
476extern void stop_tty(struct tty_struct *tty);
477extern void __start_tty(struct tty_struct *tty);
478extern void start_tty(struct tty_struct *tty);
479extern int tty_register_driver(struct tty_driver *driver);
480extern int tty_unregister_driver(struct tty_driver *driver);
481extern struct device *tty_register_device(struct tty_driver *driver,
482 unsigned index, struct device *dev);
483extern struct device *tty_register_device_attr(struct tty_driver *driver,
484 unsigned index, struct device *device,
485 void *drvdata,
486 const struct attribute_group **attr_grp);
487extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
488extern void tty_write_message(struct tty_struct *tty, char *msg);
489extern int tty_send_xchar(struct tty_struct *tty, char ch);
490extern int tty_put_char(struct tty_struct *tty, unsigned char c);
491extern int tty_chars_in_buffer(struct tty_struct *tty);
492extern int tty_write_room(struct tty_struct *tty);
493extern void tty_driver_flush_buffer(struct tty_struct *tty);
494extern void tty_throttle(struct tty_struct *tty);
495extern void tty_unthrottle(struct tty_struct *tty);
496extern int tty_throttle_safe(struct tty_struct *tty);
497extern int tty_unthrottle_safe(struct tty_struct *tty);
498extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
499extern int is_current_pgrp_orphaned(void);
500extern void tty_hangup(struct tty_struct *tty);
501extern void tty_vhangup(struct tty_struct *tty);
502extern void tty_vhangup_session(struct tty_struct *tty);
503extern int tty_hung_up_p(struct file *filp);
504extern void do_SAK(struct tty_struct *tty);
505extern void __do_SAK(struct tty_struct *tty);
506extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
507extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
508extern void session_clear_tty(struct pid *session);
509extern void no_tty(void);
510extern void tty_buffer_free_all(struct tty_port *port);
511extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
512extern void tty_buffer_init(struct tty_port *port);
513extern void tty_buffer_set_lock_subclass(struct tty_port *port);
514extern bool tty_buffer_restart_work(struct tty_port *port);
515extern bool tty_buffer_cancel_work(struct tty_port *port);
516extern void tty_buffer_flush_work(struct tty_port *port);
517extern speed_t tty_termios_baud_rate(struct ktermios *termios);
518extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
519extern void tty_termios_encode_baud_rate(struct ktermios *termios,
520 speed_t ibaud, speed_t obaud);
521extern void tty_encode_baud_rate(struct tty_struct *tty,
522 speed_t ibaud, speed_t obaud);
523
524
525
526
527
528
529
530
531
532
533
534static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
535{
536 return tty_termios_baud_rate(&tty->termios);
537}
538
539extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
540extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
541extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
542
543extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
544extern void tty_ldisc_deref(struct tty_ldisc *);
545extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
546extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
547extern int tty_ldisc_reinit(struct tty_struct *tty, int disc);
548extern const struct seq_operations tty_ldiscs_seq_ops;
549
550extern void tty_wakeup(struct tty_struct *tty);
551extern void tty_ldisc_flush(struct tty_struct *tty);
552
553extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
554extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
555 unsigned int cmd, unsigned long arg);
556extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
557 struct file *file, unsigned int cmd, unsigned long arg);
558extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
559extern void tty_default_fops(struct file_operations *fops);
560extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
561extern int tty_alloc_file(struct file *file);
562extern void tty_add_file(struct tty_struct *tty, struct file *file);
563extern void tty_free_file(struct file *file);
564extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
565extern void tty_release_struct(struct tty_struct *tty, int idx);
566extern int tty_release(struct inode *inode, struct file *filp);
567extern void tty_init_termios(struct tty_struct *tty);
568extern void tty_save_termios(struct tty_struct *tty);
569extern int tty_standard_install(struct tty_driver *driver,
570 struct tty_struct *tty);
571
572extern struct mutex tty_mutex;
573
574#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
575
576extern void tty_port_init(struct tty_port *port);
577extern void tty_port_link_device(struct tty_port *port,
578 struct tty_driver *driver, unsigned index);
579extern struct device *tty_port_register_device(struct tty_port *port,
580 struct tty_driver *driver, unsigned index,
581 struct device *device);
582extern struct device *tty_port_register_device_attr(struct tty_port *port,
583 struct tty_driver *driver, unsigned index,
584 struct device *device, void *drvdata,
585 const struct attribute_group **attr_grp);
586extern struct device *tty_port_register_device_serdev(struct tty_port *port,
587 struct tty_driver *driver, unsigned index,
588 struct device *device);
589extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
590 struct tty_driver *driver, unsigned index,
591 struct device *device, void *drvdata,
592 const struct attribute_group **attr_grp);
593extern void tty_port_unregister_device(struct tty_port *port,
594 struct tty_driver *driver, unsigned index);
595extern int tty_port_alloc_xmit_buf(struct tty_port *port);
596extern void tty_port_free_xmit_buf(struct tty_port *port);
597extern void tty_port_destroy(struct tty_port *port);
598extern void tty_port_put(struct tty_port *port);
599
600static inline struct tty_port *tty_port_get(struct tty_port *port)
601{
602 if (port && kref_get_unless_zero(&port->kref))
603 return port;
604 return NULL;
605}
606
607
608static inline bool tty_port_cts_enabled(struct tty_port *port)
609{
610 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
611}
612
613static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
614{
615 if (val)
616 set_bit(TTY_PORT_CTS_FLOW, &port->iflags);
617 else
618 clear_bit(TTY_PORT_CTS_FLOW, &port->iflags);
619}
620
621static inline bool tty_port_active(struct tty_port *port)
622{
623 return test_bit(TTY_PORT_ACTIVE, &port->iflags);
624}
625
626static inline void tty_port_set_active(struct tty_port *port, bool val)
627{
628 if (val)
629 set_bit(TTY_PORT_ACTIVE, &port->iflags);
630 else
631 clear_bit(TTY_PORT_ACTIVE, &port->iflags);
632}
633
634static inline bool tty_port_check_carrier(struct tty_port *port)
635{
636 return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
637}
638
639static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
640{
641 if (val)
642 set_bit(TTY_PORT_CHECK_CD, &port->iflags);
643 else
644 clear_bit(TTY_PORT_CHECK_CD, &port->iflags);
645}
646
647static inline bool tty_port_suspended(struct tty_port *port)
648{
649 return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
650}
651
652static inline void tty_port_set_suspended(struct tty_port *port, bool val)
653{
654 if (val)
655 set_bit(TTY_PORT_SUSPENDED, &port->iflags);
656 else
657 clear_bit(TTY_PORT_SUSPENDED, &port->iflags);
658}
659
660static inline bool tty_port_initialized(struct tty_port *port)
661{
662 return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
663}
664
665static inline void tty_port_set_initialized(struct tty_port *port, bool val)
666{
667 if (val)
668 set_bit(TTY_PORT_INITIALIZED, &port->iflags);
669 else
670 clear_bit(TTY_PORT_INITIALIZED, &port->iflags);
671}
672
673static inline bool tty_port_kopened(struct tty_port *port)
674{
675 return test_bit(TTY_PORT_KOPENED, &port->iflags);
676}
677
678static inline void tty_port_set_kopened(struct tty_port *port, bool val)
679{
680 if (val)
681 set_bit(TTY_PORT_KOPENED, &port->iflags);
682 else
683 clear_bit(TTY_PORT_KOPENED, &port->iflags);
684}
685
686extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
687extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
688extern int tty_port_carrier_raised(struct tty_port *port);
689extern void tty_port_raise_dtr_rts(struct tty_port *port);
690extern void tty_port_lower_dtr_rts(struct tty_port *port);
691extern void tty_port_hangup(struct tty_port *port);
692extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
693extern void tty_port_tty_wakeup(struct tty_port *port);
694extern int tty_port_block_til_ready(struct tty_port *port,
695 struct tty_struct *tty, struct file *filp);
696extern int tty_port_close_start(struct tty_port *port,
697 struct tty_struct *tty, struct file *filp);
698extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
699extern void tty_port_close(struct tty_port *port,
700 struct tty_struct *tty, struct file *filp);
701extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
702 struct tty_struct *tty);
703extern int tty_port_open(struct tty_port *port,
704 struct tty_struct *tty, struct file *filp);
705static inline int tty_port_users(struct tty_port *port)
706{
707 return port->count + port->blocked_open;
708}
709
710extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
711extern int tty_unregister_ldisc(int disc);
712extern int tty_set_ldisc(struct tty_struct *tty, int disc);
713extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
714extern void tty_ldisc_release(struct tty_struct *tty);
715extern int __must_check tty_ldisc_init(struct tty_struct *tty);
716extern void tty_ldisc_deinit(struct tty_struct *tty);
717extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
718 char *f, int count);
719
720
721extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
722#ifdef CONFIG_TTY
723extern void __init n_tty_init(void);
724#else
725static inline void n_tty_init(void) { }
726#endif
727
728
729#ifdef CONFIG_AUDIT
730extern void tty_audit_add_data(struct tty_struct *tty, const void *data,
731 size_t size);
732extern void tty_audit_exit(void);
733extern void tty_audit_fork(struct signal_struct *sig);
734extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
735extern int tty_audit_push(void);
736#else
737static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
738 size_t size)
739{
740}
741static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
742{
743}
744static inline void tty_audit_exit(void)
745{
746}
747static inline void tty_audit_fork(struct signal_struct *sig)
748{
749}
750static inline int tty_audit_push(void)
751{
752 return 0;
753}
754#endif
755
756
757extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
758 unsigned int cmd, unsigned long arg);
759
760
761
762extern int vt_ioctl(struct tty_struct *tty,
763 unsigned int cmd, unsigned long arg);
764
765extern long vt_compat_ioctl(struct tty_struct *tty,
766 unsigned int cmd, unsigned long arg);
767
768
769
770extern void tty_lock(struct tty_struct *tty);
771extern int tty_lock_interruptible(struct tty_struct *tty);
772extern void tty_unlock(struct tty_struct *tty);
773extern void tty_lock_slave(struct tty_struct *tty);
774extern void tty_unlock_slave(struct tty_struct *tty);
775extern void tty_set_lock_subclass(struct tty_struct *tty);
776
777#ifdef CONFIG_PROC_FS
778extern void proc_tty_register_driver(struct tty_driver *);
779extern void proc_tty_unregister_driver(struct tty_driver *);
780#else
781static inline void proc_tty_register_driver(struct tty_driver *d) {}
782static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
783#endif
784
785#define tty_msg(fn, tty, f, ...) \
786 fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__)
787
788#define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__)
789#define tty_info(tty, f, ...) tty_msg(pr_info, tty, f, ##__VA_ARGS__)
790#define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__)
791#define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__)
792#define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__)
793
794#define tty_info_ratelimited(tty, f, ...) \
795 tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__)
796
797#endif
798