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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 | |
16 | |
17 | |
18 | /* |
19 | * (Note: the *_driver.minor_start values 1, 64, 128, 192 are |
20 | * hardcoded at present.) |
21 | */ |
22 | #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ |
23 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
24 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
25 | |
26 | /* |
27 | * This character is the same as _POSIX_VDISABLE: it cannot be used as |
28 | * a c_cc[] character, but indicates that a particular special character |
29 | * isn't in use (eg VINTR has no character etc) |
30 | */ |
31 | #define __DISABLED_CHAR '\0' |
32 | |
33 | struct tty_buffer { |
34 | union { |
35 | struct tty_buffer *next; |
36 | struct llist_node free; |
37 | }; |
38 | int used; |
39 | int size; |
40 | int commit; |
41 | int read; |
42 | /* Data points here */ |
43 | unsigned long data[0]; |
44 | }; |
45 | |
46 | static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) |
47 | { |
48 | return ((unsigned char *)b->data) + ofs; |
49 | } |
50 | |
51 | static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) |
52 | { |
53 | return (char *)char_buf_ptr(b, ofs) + b->size; |
54 | } |
55 | |
56 | struct tty_bufhead { |
57 | struct tty_buffer *head; /* Queue head */ |
58 | struct work_struct work; |
59 | struct mutex lock; |
60 | atomic_t priority; |
61 | struct tty_buffer sentinel; |
62 | struct llist_head free; /* Free queue head */ |
63 | atomic_t memory_used; /* In-use buffers excluding free list */ |
64 | struct tty_buffer *tail; /* Active buffer */ |
65 | }; |
66 | /* |
67 | * When a break, frame error, or parity error happens, these codes are |
68 | * stuffed into the flags buffer. |
69 | */ |
70 | #define TTY_NORMAL 0 |
71 | #define TTY_BREAK 1 |
72 | #define TTY_FRAME 2 |
73 | #define TTY_PARITY 3 |
74 | #define TTY_OVERRUN 4 |
75 | |
76 | #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) |
77 | #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) |
78 | #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) |
79 | #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) |
80 | #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) |
81 | #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) |
82 | #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) |
83 | #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) |
84 | #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) |
85 | #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) |
86 | #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) |
87 | #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) |
88 | #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) |
89 | #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) |
90 | #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) |
91 | #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) |
92 | #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) |
93 | |
94 | #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) |
95 | #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) |
96 | #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) |
97 | #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) |
98 | |
99 | #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) |
100 | #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) |
101 | #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) |
102 | #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) |
103 | #define I_INPCK(tty) _I_FLAG((tty), INPCK) |
104 | #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) |
105 | #define I_INLCR(tty) _I_FLAG((tty), INLCR) |
106 | #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) |
107 | #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) |
108 | #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) |
109 | #define I_IXON(tty) _I_FLAG((tty), IXON) |
110 | #define I_IXANY(tty) _I_FLAG((tty), IXANY) |
111 | #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) |
112 | #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) |
113 | #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) |
114 | |
115 | #define O_OPOST(tty) _O_FLAG((tty), OPOST) |
116 | #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) |
117 | #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) |
118 | #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) |
119 | #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) |
120 | #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) |
121 | #define O_OFILL(tty) _O_FLAG((tty), OFILL) |
122 | #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) |
123 | #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) |
124 | #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) |
125 | #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) |
126 | #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) |
127 | #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) |
128 | #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) |
129 | |
130 | #define C_BAUD(tty) _C_FLAG((tty), CBAUD) |
131 | #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) |
132 | #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) |
133 | #define C_CREAD(tty) _C_FLAG((tty), CREAD) |
134 | #define C_PARENB(tty) _C_FLAG((tty), PARENB) |
135 | #define C_PARODD(tty) _C_FLAG((tty), PARODD) |
136 | #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) |
137 | #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) |
138 | #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) |
139 | #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) |
140 | |
141 | #define L_ISIG(tty) _L_FLAG((tty), ISIG) |
142 | #define L_ICANON(tty) _L_FLAG((tty), ICANON) |
143 | #define L_XCASE(tty) _L_FLAG((tty), XCASE) |
144 | #define L_ECHO(tty) _L_FLAG((tty), ECHO) |
145 | #define L_ECHOE(tty) _L_FLAG((tty), ECHOE) |
146 | #define L_ECHOK(tty) _L_FLAG((tty), ECHOK) |
147 | #define L_ECHONL(tty) _L_FLAG((tty), ECHONL) |
148 | #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) |
149 | #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) |
150 | #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) |
151 | #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) |
152 | #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) |
153 | #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) |
154 | #define L_PENDIN(tty) _L_FLAG((tty), PENDIN) |
155 | #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) |
156 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
157 | |
158 | struct device; |
159 | struct signal_struct; |
160 | |
161 | /* |
162 | * Port level information. Each device keeps its own port level information |
163 | * so provide a common structure for those ports wanting to use common support |
164 | * routines. |
165 | * |
166 | * The tty port has a different lifetime to the tty so must be kept apart. |
167 | * In addition be careful as tty -> port mappings are valid for the life |
168 | * of the tty object but in many cases port -> tty mappings are valid only |
169 | * until a hangup so don't use the wrong path. |
170 | */ |
171 | |
172 | struct tty_port; |
173 | |
174 | struct tty_port_operations { |
175 | /* Return 1 if the carrier is raised */ |
176 | int (*carrier_raised)(struct tty_port *port); |
177 | /* Control the DTR line */ |
178 | void (*dtr_rts)(struct tty_port *port, int raise); |
179 | /* Called when the last close completes or a hangup finishes |
180 | IFF the port was initialized. Do not use to free resources. Called |
181 | under the port mutex to serialize against activate/shutdowns */ |
182 | void (*shutdown)(struct tty_port *port); |
183 | /* Called under the port mutex from tty_port_open, serialized using |
184 | the port mutex */ |
185 | /* FIXME: long term getting the tty argument *out* of this would be |
186 | good for consoles */ |
187 | int (*activate)(struct tty_port *port, struct tty_struct *tty); |
188 | /* Called on the final put of a port */ |
189 | void (*destruct)(struct tty_port *port); |
190 | }; |
191 | |
192 | struct tty_port { |
193 | struct tty_bufhead buf; /* Locked internally */ |
194 | struct tty_struct *tty; /* Back pointer */ |
195 | struct tty_struct *itty; /* internal back ptr */ |
196 | const struct tty_port_operations *ops; /* Port operations */ |
197 | spinlock_t lock; /* Lock protecting tty field */ |
198 | int blocked_open; /* Waiting to open */ |
199 | int count; /* Usage count */ |
200 | wait_queue_head_t open_wait; /* Open waiters */ |
201 | wait_queue_head_t close_wait; /* Close waiters */ |
202 | wait_queue_head_t delta_msr_wait; /* Modem status change */ |
203 | unsigned long flags; /* TTY flags ASY_*/ |
204 | unsigned char console:1, /* port is a console */ |
205 | low_latency:1; /* direct buffer flush */ |
206 | struct mutex mutex; /* Locking */ |
207 | struct mutex buf_mutex; /* Buffer alloc lock */ |
208 | unsigned char *xmit_buf; /* Optional buffer */ |
209 | unsigned int close_delay; /* Close port delay */ |
210 | unsigned int closing_wait; /* Delay for output */ |
211 | int drain_delay; /* Set to zero if no pure time |
212 | based drain is needed else |
213 | set to size of fifo */ |
214 | struct kref kref; /* Ref counter */ |
215 | }; |
216 | |
217 | /* |
218 | * Where all of the state associated with a tty is kept while the tty |
219 | * is open. Since the termios state should be kept even if the tty |
220 | * has been closed --- for things like the baud rate, etc --- it is |
221 | * not stored here, but rather a pointer to the real state is stored |
222 | * here. Possible the winsize structure should have the same |
223 | * treatment, but (1) the default 80x24 is usually right and (2) it's |
224 | * most often used by a windowing system, which will set the correct |
225 | * size each time the window is created or resized anyway. |
226 | * - TYT, 9/14/92 |
227 | */ |
228 | |
229 | struct tty_operations; |
230 | |
231 | struct tty_struct { |
232 | int magic; |
233 | struct kref kref; |
234 | struct device *dev; |
235 | struct tty_driver *driver; |
236 | const struct tty_operations *ops; |
237 | int index; |
238 | |
239 | /* Protects ldisc changes: Lock tty not pty */ |
240 | struct ld_semaphore ldisc_sem; |
241 | struct tty_ldisc *ldisc; |
242 | |
243 | struct mutex atomic_write_lock; |
244 | struct mutex legacy_mutex; |
245 | struct mutex throttle_mutex; |
246 | struct rw_semaphore termios_rwsem; |
247 | struct mutex winsize_mutex; |
248 | spinlock_t ctrl_lock; |
249 | /* Termios values are protected by the termios rwsem */ |
250 | struct ktermios termios, termios_locked; |
251 | struct termiox *termiox; /* May be NULL for unsupported */ |
252 | char name[64]; |
253 | struct pid *pgrp; /* Protected by ctrl lock */ |
254 | struct pid *session; |
255 | unsigned long flags; |
256 | int count; |
257 | struct winsize winsize; /* winsize_mutex */ |
258 | unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; |
259 | unsigned char ctrl_status; /* ctrl_lock */ |
260 | unsigned int receive_room; /* Bytes free for queue */ |
261 | int flow_change; |
262 | |
263 | struct tty_struct *link; |
264 | struct fasync_struct *fasync; |
265 | int alt_speed; /* For magic substitution of 38400 bps */ |
266 | wait_queue_head_t write_wait; |
267 | wait_queue_head_t read_wait; |
268 | struct work_struct hangup_work; |
269 | void *disc_data; |
270 | void *driver_data; |
271 | struct list_head tty_files; |
272 | |
273 | #define N_TTY_BUF_SIZE 4096 |
274 | |
275 | unsigned char closing:1; |
276 | unsigned char *write_buf; |
277 | int write_cnt; |
278 | /* If the tty has a pending do_SAK, queue it here - akpm */ |
279 | struct work_struct SAK_work; |
280 | struct tty_port *port; |
281 | }; |
282 | |
283 | /* Each of a tty's open files has private_data pointing to tty_file_private */ |
284 | struct tty_file_private { |
285 | struct tty_struct *tty; |
286 | struct file *file; |
287 | struct list_head list; |
288 | }; |
289 | |
290 | /* tty magic number */ |
291 | #define TTY_MAGIC 0x5401 |
292 | |
293 | /* |
294 | * These bits are used in the flags field of the tty structure. |
295 | * |
296 | * So that interrupts won't be able to mess up the queues, |
297 | * copy_to_cooked must be atomic with respect to itself, as must |
298 | * tty->write. Thus, you must use the inline functions set_bit() and |
299 | * clear_bit() to make things atomic. |
300 | */ |
301 | #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ |
302 | #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ |
303 | #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ |
304 | #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ |
305 | #define TTY_DEBUG 4 /* Debugging */ |
306 | #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ |
307 | #define TTY_CLOSING 7 /* ->close() in progress */ |
308 | #define TTY_LDISC_OPEN 11 /* Line discipline is open */ |
309 | #define TTY_PTY_LOCK 16 /* pty private */ |
310 | #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ |
311 | #define TTY_HUPPED 18 /* Post driver->hangup() */ |
312 | #define TTY_HUPPING 21 /* ->hangup() in progress */ |
313 | #define TTY_LDISC_HALTED 22 /* Line discipline is halted */ |
314 | |
315 | #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) |
316 | |
317 | /* Values for tty->flow_change */ |
318 | #define TTY_THROTTLE_SAFE 1 |
319 | #define TTY_UNTHROTTLE_SAFE 2 |
320 | |
321 | static inline void __tty_set_flow_change(struct tty_struct *tty, int val) |
322 | { |
323 | tty->flow_change = val; |
324 | } |
325 | |
326 | static inline void tty_set_flow_change(struct tty_struct *tty, int val) |
327 | { |
328 | tty->flow_change = val; |
329 | smp_mb(); |
330 | } |
331 | |
332 | #ifdef CONFIG_TTY |
333 | extern void console_init(void); |
334 | extern void tty_kref_put(struct tty_struct *tty); |
335 | extern struct pid *tty_get_pgrp(struct tty_struct *tty); |
336 | extern void tty_vhangup_self(void); |
337 | extern void disassociate_ctty(int priv); |
338 | extern dev_t tty_devnum(struct tty_struct *tty); |
339 | extern void proc_clear_tty(struct task_struct *p); |
340 | extern struct tty_struct *get_current_tty(void); |
341 | /* tty_io.c */ |
342 | extern int __init tty_init(void); |
343 | #else |
344 | static inline void console_init(void) |
345 | { } |
346 | static inline void tty_kref_put(struct tty_struct *tty) |
347 | { } |
348 | static inline struct pid *tty_get_pgrp(struct tty_struct *tty) |
349 | { return NULL; } |
350 | static inline void tty_vhangup_self(void) |
351 | { } |
352 | static inline void disassociate_ctty(int priv) |
353 | { } |
354 | static inline dev_t tty_devnum(struct tty_struct *tty) |
355 | { return 0; } |
356 | static inline void proc_clear_tty(struct task_struct *p) |
357 | { } |
358 | static inline struct tty_struct *get_current_tty(void) |
359 | { return NULL; } |
360 | /* tty_io.c */ |
361 | static inline int __init tty_init(void) |
362 | { return 0; } |
363 | #endif |
364 | |
365 | extern void tty_write_flush(struct tty_struct *); |
366 | |
367 | extern struct ktermios tty_std_termios; |
368 | |
369 | extern int vcs_init(void); |
370 | |
371 | extern struct class *tty_class; |
372 | |
373 | /** |
374 | * tty_kref_get - get a tty reference |
375 | * @tty: tty device |
376 | * |
377 | * Return a new reference to a tty object. The caller must hold |
378 | * sufficient locks/counts to ensure that their existing reference cannot |
379 | * go away |
380 | */ |
381 | |
382 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
383 | { |
384 | if (tty) |
385 | kref_get(&tty->kref); |
386 | return tty; |
387 | } |
388 | |
389 | extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, |
390 | const char *routine); |
391 | extern char *tty_name(struct tty_struct *tty, char *buf); |
392 | extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
393 | extern int tty_check_change(struct tty_struct *tty); |
394 | extern void stop_tty(struct tty_struct *tty); |
395 | extern void start_tty(struct tty_struct *tty); |
396 | extern int tty_register_driver(struct tty_driver *driver); |
397 | extern int tty_unregister_driver(struct tty_driver *driver); |
398 | extern struct device *tty_register_device(struct tty_driver *driver, |
399 | unsigned index, struct device *dev); |
400 | extern struct device *tty_register_device_attr(struct tty_driver *driver, |
401 | unsigned index, struct device *device, |
402 | void *drvdata, |
403 | const struct attribute_group **attr_grp); |
404 | extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
405 | extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, |
406 | int buflen); |
407 | extern void tty_write_message(struct tty_struct *tty, char *msg); |
408 | extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
409 | extern int tty_chars_in_buffer(struct tty_struct *tty); |
410 | extern int tty_write_room(struct tty_struct *tty); |
411 | extern void tty_driver_flush_buffer(struct tty_struct *tty); |
412 | extern void tty_throttle(struct tty_struct *tty); |
413 | extern void tty_unthrottle(struct tty_struct *tty); |
414 | extern int tty_throttle_safe(struct tty_struct *tty); |
415 | extern int tty_unthrottle_safe(struct tty_struct *tty); |
416 | extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
417 | extern void tty_driver_remove_tty(struct tty_driver *driver, |
418 | struct tty_struct *tty); |
419 | extern void tty_free_termios(struct tty_struct *tty); |
420 | extern int is_current_pgrp_orphaned(void); |
421 | extern int is_ignored(int sig); |
422 | extern int tty_signal(int sig, struct tty_struct *tty); |
423 | extern void tty_hangup(struct tty_struct *tty); |
424 | extern void tty_vhangup(struct tty_struct *tty); |
425 | extern void tty_vhangup_locked(struct tty_struct *tty); |
426 | extern void tty_unhangup(struct file *filp); |
427 | extern int tty_hung_up_p(struct file *filp); |
428 | extern void do_SAK(struct tty_struct *tty); |
429 | extern void __do_SAK(struct tty_struct *tty); |
430 | extern void no_tty(void); |
431 | extern void tty_flush_to_ldisc(struct tty_struct *tty); |
432 | extern void tty_buffer_free_all(struct tty_port *port); |
433 | extern void tty_buffer_flush(struct tty_struct *tty); |
434 | extern void tty_buffer_init(struct tty_port *port); |
435 | extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
436 | extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); |
437 | extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
438 | speed_t ibaud, speed_t obaud); |
439 | extern void tty_encode_baud_rate(struct tty_struct *tty, |
440 | speed_t ibaud, speed_t obaud); |
441 | |
442 | /** |
443 | * tty_get_baud_rate - get tty bit rates |
444 | * @tty: tty to query |
445 | * |
446 | * Returns the baud rate as an integer for this terminal. The |
447 | * termios lock must be held by the caller and the terminal bit |
448 | * flags may be updated. |
449 | * |
450 | * Locking: none |
451 | */ |
452 | static inline speed_t tty_get_baud_rate(struct tty_struct *tty) |
453 | { |
454 | return tty_termios_baud_rate(&tty->termios); |
455 | } |
456 | |
457 | extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
458 | extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); |
459 | extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
460 | |
461 | extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); |
462 | extern void tty_ldisc_deref(struct tty_ldisc *); |
463 | extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); |
464 | extern void tty_ldisc_hangup(struct tty_struct *tty); |
465 | extern const struct file_operations tty_ldiscs_proc_fops; |
466 | |
467 | extern void tty_wakeup(struct tty_struct *tty); |
468 | extern void tty_ldisc_flush(struct tty_struct *tty); |
469 | |
470 | extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
471 | extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
472 | unsigned int cmd, unsigned long arg); |
473 | extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
474 | extern void tty_default_fops(struct file_operations *fops); |
475 | extern struct tty_struct *alloc_tty_struct(void); |
476 | extern int tty_alloc_file(struct file *file); |
477 | extern void tty_add_file(struct tty_struct *tty, struct file *file); |
478 | extern void tty_free_file(struct file *file); |
479 | extern void free_tty_struct(struct tty_struct *tty); |
480 | extern void initialize_tty_struct(struct tty_struct *tty, |
481 | struct tty_driver *driver, int idx); |
482 | extern void deinitialize_tty_struct(struct tty_struct *tty); |
483 | extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); |
484 | extern int tty_release(struct inode *inode, struct file *filp); |
485 | extern int tty_init_termios(struct tty_struct *tty); |
486 | extern int tty_standard_install(struct tty_driver *driver, |
487 | struct tty_struct *tty); |
488 | |
489 | extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); |
490 | extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); |
491 | |
492 | extern struct mutex tty_mutex; |
493 | extern spinlock_t tty_files_lock; |
494 | |
495 | extern void tty_write_unlock(struct tty_struct *tty); |
496 | extern int tty_write_lock(struct tty_struct *tty, int ndelay); |
497 | #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
498 | |
499 | extern void tty_port_init(struct tty_port *port); |
500 | extern void tty_port_link_device(struct tty_port *port, |
501 | struct tty_driver *driver, unsigned index); |
502 | extern struct device *tty_port_register_device(struct tty_port *port, |
503 | struct tty_driver *driver, unsigned index, |
504 | struct device *device); |
505 | extern struct device *tty_port_register_device_attr(struct tty_port *port, |
506 | struct tty_driver *driver, unsigned index, |
507 | struct device *device, void *drvdata, |
508 | const struct attribute_group **attr_grp); |
509 | extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
510 | extern void tty_port_free_xmit_buf(struct tty_port *port); |
511 | extern void tty_port_destroy(struct tty_port *port); |
512 | extern void tty_port_put(struct tty_port *port); |
513 | |
514 | static inline struct tty_port *tty_port_get(struct tty_port *port) |
515 | { |
516 | if (port) |
517 | kref_get(&port->kref); |
518 | return port; |
519 | } |
520 | |
521 | /* If the cts flow control is enabled, return true. */ |
522 | static inline bool tty_port_cts_enabled(struct tty_port *port) |
523 | { |
524 | return port->flags & ASYNC_CTS_FLOW; |
525 | } |
526 | |
527 | extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
528 | extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); |
529 | extern int tty_port_carrier_raised(struct tty_port *port); |
530 | extern void tty_port_raise_dtr_rts(struct tty_port *port); |
531 | extern void tty_port_lower_dtr_rts(struct tty_port *port); |
532 | extern void tty_port_hangup(struct tty_port *port); |
533 | extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); |
534 | extern void tty_port_tty_wakeup(struct tty_port *port); |
535 | extern int tty_port_block_til_ready(struct tty_port *port, |
536 | struct tty_struct *tty, struct file *filp); |
537 | extern int tty_port_close_start(struct tty_port *port, |
538 | struct tty_struct *tty, struct file *filp); |
539 | extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); |
540 | extern void tty_port_close(struct tty_port *port, |
541 | struct tty_struct *tty, struct file *filp); |
542 | extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
543 | struct tty_struct *tty); |
544 | extern int tty_port_open(struct tty_port *port, |
545 | struct tty_struct *tty, struct file *filp); |
546 | static inline int tty_port_users(struct tty_port *port) |
547 | { |
548 | return port->count + port->blocked_open; |
549 | } |
550 | |
551 | extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
552 | extern int tty_unregister_ldisc(int disc); |
553 | extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); |
554 | extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
555 | extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); |
556 | extern void tty_ldisc_init(struct tty_struct *tty); |
557 | extern void tty_ldisc_deinit(struct tty_struct *tty); |
558 | extern void tty_ldisc_begin(void); |
559 | |
560 | static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p, |
561 | char *f, int count) |
562 | { |
563 | if (ld->ops->receive_buf2) |
564 | count = ld->ops->receive_buf2(ld->tty, p, f, count); |
565 | else { |
566 | count = min_t(int, count, ld->tty->receive_room); |
567 | if (count) |
568 | ld->ops->receive_buf(ld->tty, p, f, count); |
569 | } |
570 | return count; |
571 | } |
572 | |
573 | |
574 | /* n_tty.c */ |
575 | extern struct tty_ldisc_ops tty_ldisc_N_TTY; |
576 | extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
577 | |
578 | /* tty_audit.c */ |
579 | #ifdef CONFIG_AUDIT |
580 | extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, |
581 | size_t size, unsigned icanon); |
582 | extern void tty_audit_exit(void); |
583 | extern void tty_audit_fork(struct signal_struct *sig); |
584 | extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
585 | extern void tty_audit_push(struct tty_struct *tty); |
586 | extern int tty_audit_push_current(void); |
587 | #else |
588 | static inline void tty_audit_add_data(struct tty_struct *tty, |
589 | unsigned char *data, size_t size, unsigned icanon) |
590 | { |
591 | } |
592 | static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
593 | { |
594 | } |
595 | static inline void tty_audit_exit(void) |
596 | { |
597 | } |
598 | static inline void tty_audit_fork(struct signal_struct *sig) |
599 | { |
600 | } |
601 | static inline void tty_audit_push(struct tty_struct *tty) |
602 | { |
603 | } |
604 | static inline int tty_audit_push_current(void) |
605 | { |
606 | return 0; |
607 | } |
608 | #endif |
609 | |
610 | /* tty_ioctl.c */ |
611 | extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
612 | unsigned int cmd, unsigned long arg); |
613 | extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, |
614 | unsigned int cmd, unsigned long arg); |
615 | |
616 | /* serial.c */ |
617 | |
618 | extern void serial_console_init(void); |
619 | |
620 | /* pcxx.c */ |
621 | |
622 | extern int pcxe_open(struct tty_struct *tty, struct file *filp); |
623 | |
624 | /* vt.c */ |
625 | |
626 | extern int vt_ioctl(struct tty_struct *tty, |
627 | unsigned int cmd, unsigned long arg); |
628 | |
629 | extern long vt_compat_ioctl(struct tty_struct *tty, |
630 | unsigned int cmd, unsigned long arg); |
631 | |
632 | /* tty_mutex.c */ |
633 | /* functions for preparation of BKL removal */ |
634 | extern void __lockfunc tty_lock(struct tty_struct *tty); |
635 | extern void __lockfunc tty_unlock(struct tty_struct *tty); |
636 | extern void __lockfunc tty_lock_pair(struct tty_struct *tty, |
637 | struct tty_struct *tty2); |
638 | extern void __lockfunc tty_unlock_pair(struct tty_struct *tty, |
639 | struct tty_struct *tty2); |
640 | |
641 | /* |
642 | * this shall be called only from where BTM is held (like close) |
643 | * |
644 | * We need this to ensure nobody waits for us to finish while we are waiting. |
645 | * Without this we were encountering system stalls. |
646 | * |
647 | * This should be indeed removed with BTM removal later. |
648 | * |
649 | * Locking: BTM required. Nobody is allowed to hold port->mutex. |
650 | */ |
651 | static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, |
652 | long timeout) |
653 | { |
654 | tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */ |
655 | tty_wait_until_sent(tty, timeout); |
656 | tty_lock(tty); |
657 | } |
658 | |
659 | /* |
660 | * wait_event_interruptible_tty -- wait for a condition with the tty lock held |
661 | * |
662 | * The condition we are waiting for might take a long time to |
663 | * become true, or might depend on another thread taking the |
664 | * BTM. In either case, we need to drop the BTM to guarantee |
665 | * forward progress. This is a leftover from the conversion |
666 | * from the BKL and should eventually get removed as the BTM |
667 | * falls out of use. |
668 | * |
669 | * Do not use in new code. |
670 | */ |
671 | #define wait_event_interruptible_tty(tty, wq, condition) \ |
672 | ({ \ |
673 | int __ret = 0; \ |
674 | if (!(condition)) \ |
675 | __ret = __wait_event_interruptible_tty(tty, wq, \ |
676 | condition); \ |
677 | __ret; \ |
678 | }) |
679 | |
680 | #define __wait_event_interruptible_tty(tty, wq, condition) \ |
681 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \ |
682 | tty_unlock(tty); \ |
683 | schedule(); \ |
684 | tty_lock(tty)) |
685 | |
686 | #ifdef CONFIG_PROC_FS |
687 | extern void proc_tty_register_driver(struct tty_driver *); |
688 | extern void proc_tty_unregister_driver(struct tty_driver *); |
689 | #else |
690 | static inline void proc_tty_register_driver(struct tty_driver *d) {} |
691 | static inline void proc_tty_unregister_driver(struct tty_driver *d) {} |
692 | #endif |
693 | |
694 | #endif |
695 |
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