Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_TTY_H |
3 | #define _LINUX_TTY_H | |
4 | ||
ae92c1f5 FF |
5 | #include <linux/fs.h> |
6 | #include <linux/major.h> | |
7 | #include <linux/termios.h> | |
8 | #include <linux/workqueue.h> | |
8d29e002 | 9 | #include <linux/tty_buffer.h> |
ae92c1f5 FF |
10 | #include <linux/tty_driver.h> |
11 | #include <linux/tty_ldisc.h> | |
67b94be4 | 12 | #include <linux/tty_port.h> |
ae92c1f5 | 13 | #include <linux/mutex.h> |
ba3fe7ab | 14 | #include <linux/tty_flags.h> |
607ca46e | 15 | #include <uapi/linux/tty.h> |
6a1c0680 | 16 | #include <linux/rwsem.h> |
809850b7 | 17 | #include <linux/llist.h> |
ae92c1f5 | 18 | |
ae92c1f5 | 19 | |
ae92c1f5 FF |
20 | /* |
21 | * (Note: the *_driver.minor_start values 1, 64, 128, 192 are | |
22 | * hardcoded at present.) | |
23 | */ | |
24 | #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ | |
e9aba515 | 25 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
ae92c1f5 FF |
26 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
27 | ||
1da177e4 LT |
28 | /* |
29 | * This character is the same as _POSIX_VDISABLE: it cannot be used as | |
30 | * a c_cc[] character, but indicates that a particular special character | |
31 | * isn't in use (eg VINTR has no character etc) | |
32 | */ | |
33 | #define __DISABLED_CHAR '\0' | |
34 | ||
adc8d746 AC |
35 | #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR]) |
36 | #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT]) | |
37 | #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE]) | |
38 | #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL]) | |
39 | #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF]) | |
40 | #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME]) | |
41 | #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN]) | |
42 | #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC]) | |
43 | #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART]) | |
44 | #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP]) | |
45 | #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP]) | |
46 | #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL]) | |
47 | #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT]) | |
48 | #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD]) | |
49 | #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE]) | |
50 | #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT]) | |
51 | #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2]) | |
1da177e4 | 52 | |
adc8d746 AC |
53 | #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f)) |
54 | #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f)) | |
55 | #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f)) | |
56 | #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f)) | |
7a4d29f4 AC |
57 | |
58 | #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK) | |
59 | #define I_BRKINT(tty) _I_FLAG((tty), BRKINT) | |
60 | #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR) | |
61 | #define I_PARMRK(tty) _I_FLAG((tty), PARMRK) | |
62 | #define I_INPCK(tty) _I_FLAG((tty), INPCK) | |
63 | #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP) | |
64 | #define I_INLCR(tty) _I_FLAG((tty), INLCR) | |
65 | #define I_IGNCR(tty) _I_FLAG((tty), IGNCR) | |
66 | #define I_ICRNL(tty) _I_FLAG((tty), ICRNL) | |
67 | #define I_IUCLC(tty) _I_FLAG((tty), IUCLC) | |
68 | #define I_IXON(tty) _I_FLAG((tty), IXON) | |
69 | #define I_IXANY(tty) _I_FLAG((tty), IXANY) | |
70 | #define I_IXOFF(tty) _I_FLAG((tty), IXOFF) | |
71 | #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL) | |
72 | #define I_IUTF8(tty) _I_FLAG((tty), IUTF8) | |
73 | ||
74 | #define O_OPOST(tty) _O_FLAG((tty), OPOST) | |
75 | #define O_OLCUC(tty) _O_FLAG((tty), OLCUC) | |
76 | #define O_ONLCR(tty) _O_FLAG((tty), ONLCR) | |
77 | #define O_OCRNL(tty) _O_FLAG((tty), OCRNL) | |
78 | #define O_ONOCR(tty) _O_FLAG((tty), ONOCR) | |
79 | #define O_ONLRET(tty) _O_FLAG((tty), ONLRET) | |
80 | #define O_OFILL(tty) _O_FLAG((tty), OFILL) | |
81 | #define O_OFDEL(tty) _O_FLAG((tty), OFDEL) | |
82 | #define O_NLDLY(tty) _O_FLAG((tty), NLDLY) | |
83 | #define O_CRDLY(tty) _O_FLAG((tty), CRDLY) | |
84 | #define O_TABDLY(tty) _O_FLAG((tty), TABDLY) | |
85 | #define O_BSDLY(tty) _O_FLAG((tty), BSDLY) | |
86 | #define O_VTDLY(tty) _O_FLAG((tty), VTDLY) | |
87 | #define O_FFDLY(tty) _O_FLAG((tty), FFDLY) | |
88 | ||
89 | #define C_BAUD(tty) _C_FLAG((tty), CBAUD) | |
90 | #define C_CSIZE(tty) _C_FLAG((tty), CSIZE) | |
91 | #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB) | |
92 | #define C_CREAD(tty) _C_FLAG((tty), CREAD) | |
93 | #define C_PARENB(tty) _C_FLAG((tty), PARENB) | |
94 | #define C_PARODD(tty) _C_FLAG((tty), PARODD) | |
95 | #define C_HUPCL(tty) _C_FLAG((tty), HUPCL) | |
96 | #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL) | |
97 | #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD) | |
98 | #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS) | |
e58b57a3 | 99 | #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR) |
7a4d29f4 AC |
100 | |
101 | #define L_ISIG(tty) _L_FLAG((tty), ISIG) | |
102 | #define L_ICANON(tty) _L_FLAG((tty), ICANON) | |
103 | #define L_XCASE(tty) _L_FLAG((tty), XCASE) | |
104 | #define L_ECHO(tty) _L_FLAG((tty), ECHO) | |
105 | #define L_ECHOE(tty) _L_FLAG((tty), ECHOE) | |
106 | #define L_ECHOK(tty) _L_FLAG((tty), ECHOK) | |
107 | #define L_ECHONL(tty) _L_FLAG((tty), ECHONL) | |
108 | #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH) | |
109 | #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP) | |
110 | #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL) | |
111 | #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT) | |
112 | #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE) | |
113 | #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO) | |
114 | #define L_PENDIN(tty) _L_FLAG((tty), PENDIN) | |
115 | #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN) | |
26df6d13 | 116 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
1da177e4 LT |
117 | |
118 | struct device; | |
522ed776 | 119 | struct signal_struct; |
f34d7a5b AC |
120 | struct tty_operations; |
121 | ||
6e94dbc7 JS |
122 | /** |
123 | * struct tty_struct - state associated with a tty while open | |
124 | * | |
18e6c075 JS |
125 | * @kref: reference counting by tty_kref_get() and tty_kref_put(), reaching zero |
126 | * frees the structure | |
127 | * @dev: class device or %NULL (e.g. ptys, serdev) | |
128 | * @driver: &struct tty_driver operating this tty | |
129 | * @ops: &struct tty_operations of @driver for this tty (open, close, etc.) | |
130 | * @index: index of this tty (e.g. to construct @name like tty12) | |
131 | * @ldisc_sem: protects line discipline changes (@ldisc) -- lock tty not pty | |
132 | * @ldisc: the current line discipline for this tty (n_tty by default) | |
133 | * @atomic_write_lock: protects against concurrent writers, i.e. locks | |
134 | * @write_cnt, @write_buf and similar | |
135 | * @legacy_mutex: leftover from history (BKL -> BTM -> @legacy_mutex), | |
136 | * protecting several operations on this tty | |
137 | * @throttle_mutex: protects against concurrent tty_throttle_safe() and | |
138 | * tty_unthrottle_safe() (but not tty_unthrottle()) | |
139 | * @termios_rwsem: protects @termios and @termios_locked | |
140 | * @winsize_mutex: protects @winsize | |
141 | * @termios: termios for the current tty, copied from/to @driver.termios | |
142 | * @termios_locked: locked termios (by %TIOCGLCKTRMIOS and %TIOCSLCKTRMIOS | |
143 | * ioctls) | |
144 | * @name: name of the tty constructed by tty_line_name() (e.g. ttyS3) | |
145 | * @flags: bitwise OR of %TTY_THROTTLED, %TTY_IO_ERROR, ... | |
146 | * @count: count of open processes, reaching zero cancels all the work for | |
147 | * this tty and drops a @kref too (but does not free this tty) | |
148 | * @winsize: size of the terminal "window" (cf. @winsize_mutex) | |
149 | * @flow: flow settings grouped together, see also @flow.unused | |
150 | * @flow.lock: lock for @flow members | |
151 | * @flow.stopped: tty stopped/started by stop_tty()/start_tty() | |
152 | * @flow.tco_stopped: tty stopped/started by %TCOOFF/%TCOON ioctls (it has | |
153 | * precedence over @flow.stopped) | |
6e94dbc7 JS |
154 | * @flow.unused: alignment for Alpha, so that no members other than @flow.* are |
155 | * modified by the same 64b word store. The @flow's __aligned is | |
156 | * there for the very same reason. | |
18e6c075 JS |
157 | * @ctrl: control settings grouped together, see also @ctrl.unused |
158 | * @ctrl.lock: lock for @ctrl members | |
64d608db JS |
159 | * @ctrl.pgrp: process group of this tty (setpgrp(2)) |
160 | * @ctrl.session: session of this tty (setsid(2)). Writes are protected by both | |
18e6c075 | 161 | * @ctrl.lock and @legacy_mutex, readers must use at least one of |
64d608db | 162 | * them. |
18e6c075 | 163 | * @ctrl.pktstatus: packet mode status (bitwise OR of %TIOCPKT_ constants) |
64d608db | 164 | * @ctrl.packet: packet mode enabled |
18e6c075 JS |
165 | * @ctrl.unused: alignment for Alpha, see @flow.unused for explanation |
166 | * @hw_stopped: not controlled by the tty layer, under @driver's control for CTS | |
167 | * handling | |
168 | * @receive_room: bytes permitted to feed to @ldisc without any being lost | |
169 | * @flow_change: controls behavior of throttling, see tty_throttle_safe() and | |
170 | * tty_unthrottle_safe() | |
171 | * @link: link to another pty (master -> slave and vice versa) | |
172 | * @fasync: state for %O_ASYNC (for %SIGIO); managed by fasync_helper() | |
173 | * @write_wait: concurrent writers are waiting in this queue until they are | |
174 | * allowed to write | |
175 | * @read_wait: readers wait for data in this queue | |
176 | * @hangup_work: normally a work to perform a hangup (do_tty_hangup()); while | |
177 | * freeing the tty, (re)used to release_one_tty() | |
178 | * @disc_data: pointer to @ldisc's private data (e.g. to &struct n_tty_data) | |
179 | * @driver_data: pointer to @driver's private data (e.g. &struct uart_state) | |
180 | * @files_lock: protects @tty_files list | |
181 | * @tty_files: list of (re)openers of this tty (i.e. linked &struct | |
182 | * tty_file_private) | |
183 | * @closing: when set during close, n_tty processes only START & STOP chars | |
184 | * @write_buf: temporary buffer used during tty_write() to copy user data to | |
185 | * @write_cnt: count of bytes written in tty_write() to @write_buf | |
186 | * @SAK_work: if the tty has a pending do_SAK, it is queued here | |
187 | * @port: persistent storage for this device (i.e. &struct tty_port) | |
6e94dbc7 JS |
188 | * |
189 | * All of the state associated with a tty while the tty is open. Persistent | |
18e6c075 JS |
190 | * storage for tty devices is referenced here as @port and is documented in |
191 | * &struct tty_port. | |
6e94dbc7 | 192 | */ |
1da177e4 | 193 | struct tty_struct { |
9c9f4ded | 194 | struct kref kref; |
18e6c075 | 195 | struct device *dev; |
1da177e4 | 196 | struct tty_driver *driver; |
f34d7a5b | 197 | const struct tty_operations *ops; |
1da177e4 | 198 | int index; |
c65c9bc3 | 199 | |
36697529 | 200 | struct ld_semaphore ldisc_sem; |
c65c9bc3 AC |
201 | struct tty_ldisc *ldisc; |
202 | ||
bddc7152 | 203 | struct mutex atomic_write_lock; |
89c8d91e | 204 | struct mutex legacy_mutex; |
d8c1f929 | 205 | struct mutex throttle_mutex; |
6a1c0680 | 206 | struct rw_semaphore termios_rwsem; |
dee4a0be | 207 | struct mutex winsize_mutex; |
adc8d746 | 208 | struct ktermios termios, termios_locked; |
1da177e4 | 209 | char name[64]; |
1da177e4 LT |
210 | unsigned long flags; |
211 | int count; | |
18e6c075 | 212 | struct winsize winsize; |
6e94dbc7 JS |
213 | |
214 | struct { | |
215 | spinlock_t lock; | |
216 | bool stopped; | |
217 | bool tco_stopped; | |
218 | unsigned long unused[0]; | |
219 | } __aligned(sizeof(unsigned long)) flow; | |
220 | ||
64d608db JS |
221 | struct { |
222 | spinlock_t lock; | |
223 | struct pid *pgrp; | |
224 | struct pid *session; | |
225 | unsigned char pktstatus; | |
226 | bool packet; | |
227 | unsigned long unused[0]; | |
228 | } __aligned(sizeof(unsigned long)) ctrl; | |
229 | ||
035173c9 | 230 | bool hw_stopped; |
18e6c075 | 231 | unsigned int receive_room; |
70bc1264 | 232 | int flow_change; |
1da177e4 LT |
233 | |
234 | struct tty_struct *link; | |
235 | struct fasync_struct *fasync; | |
1da177e4 LT |
236 | wait_queue_head_t write_wait; |
237 | wait_queue_head_t read_wait; | |
238 | struct work_struct hangup_work; | |
239 | void *disc_data; | |
240 | void *driver_data; | |
18e6c075 | 241 | spinlock_t files_lock; |
1da177e4 LT |
242 | struct list_head tty_files; |
243 | ||
244 | #define N_TTY_BUF_SIZE 4096 | |
6f67048c | 245 | |
413ba638 | 246 | int closing; |
1da177e4 LT |
247 | unsigned char *write_buf; |
248 | int write_cnt; | |
1da177e4 | 249 | struct work_struct SAK_work; |
6f67048c | 250 | struct tty_port *port; |
3859a271 | 251 | } __randomize_layout; |
1da177e4 | 252 | |
d996b62a NP |
253 | /* Each of a tty's open files has private_data pointing to tty_file_private */ |
254 | struct tty_file_private { | |
255 | struct tty_struct *tty; | |
256 | struct file *file; | |
257 | struct list_head list; | |
258 | }; | |
259 | ||
4072254f JS |
260 | /** |
261 | * DOC: TTY Struct Flags | |
262 | * | |
263 | * These bits are used in the :c:member:`tty_struct.flags` field. | |
7a4d29f4 | 264 | * |
1da177e4 LT |
265 | * So that interrupts won't be able to mess up the queues, |
266 | * copy_to_cooked must be atomic with respect to itself, as must | |
267 | * tty->write. Thus, you must use the inline functions set_bit() and | |
268 | * clear_bit() to make things atomic. | |
4072254f JS |
269 | * |
270 | * TTY_THROTTLED | |
271 | * Driver input is throttled. The ldisc should call | |
272 | * :c:member:`tty_driver.unthrottle()` in order to resume reception when | |
273 | * it is ready to process more data (at threshold min). | |
274 | * | |
275 | * TTY_IO_ERROR | |
276 | * If set, causes all subsequent userspace read/write calls on the tty to | |
277 | * fail, returning -%EIO. (May be no ldisc too.) | |
278 | * | |
279 | * TTY_OTHER_CLOSED | |
280 | * Device is a pty and the other side has closed. | |
281 | * | |
282 | * TTY_EXCLUSIVE | |
283 | * Exclusive open mode (a single opener). | |
284 | * | |
285 | * TTY_DO_WRITE_WAKEUP | |
286 | * If set, causes the driver to call the | |
287 | * :c:member:`tty_ldisc_ops.write_wakeup()` method in order to resume | |
288 | * transmission when it can accept more data to transmit. | |
289 | * | |
290 | * TTY_LDISC_OPEN | |
291 | * Indicates that a line discipline is open. For debugging purposes only. | |
292 | * | |
293 | * TTY_PTY_LOCK | |
294 | * A flag private to pty code to implement %TIOCSPTLCK/%TIOCGPTLCK logic. | |
295 | * | |
296 | * TTY_NO_WRITE_SPLIT | |
297 | * Prevent driver from splitting up writes into smaller chunks (preserve | |
298 | * write boundaries to driver). | |
299 | * | |
300 | * TTY_HUPPED | |
301 | * The TTY was hung up. This is set post :c:member:`tty_driver.hangup()`. | |
302 | * | |
303 | * TTY_HUPPING | |
304 | * The TTY is in the process of hanging up to abort potential readers. | |
305 | * | |
306 | * TTY_LDISC_CHANGING | |
307 | * Line discipline for this TTY is being changed. I/O should not block | |
308 | * when this is set. Use tty_io_nonblock() to check. | |
309 | * | |
310 | * TTY_LDISC_HALTED | |
311 | * Line discipline for this TTY was stopped. No work should be queued to | |
312 | * this ldisc. | |
1da177e4 | 313 | */ |
4072254f JS |
314 | #define TTY_THROTTLED 0 |
315 | #define TTY_IO_ERROR 1 | |
316 | #define TTY_OTHER_CLOSED 2 | |
317 | #define TTY_EXCLUSIVE 3 | |
318 | #define TTY_DO_WRITE_WAKEUP 5 | |
319 | #define TTY_LDISC_OPEN 11 | |
320 | #define TTY_PTY_LOCK 16 | |
321 | #define TTY_NO_WRITE_SPLIT 17 | |
322 | #define TTY_HUPPED 18 | |
323 | #define TTY_HUPPING 19 | |
324 | #define TTY_LDISC_CHANGING 20 | |
325 | #define TTY_LDISC_HALTED 22 | |
1da177e4 | 326 | |
c96cf923 DS |
327 | static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file) |
328 | { | |
329 | return file->f_flags & O_NONBLOCK || | |
330 | test_bit(TTY_LDISC_CHANGING, &tty->flags); | |
331 | } | |
332 | ||
18900ca6 PH |
333 | static inline bool tty_io_error(struct tty_struct *tty) |
334 | { | |
335 | return test_bit(TTY_IO_ERROR, &tty->flags); | |
336 | } | |
337 | ||
97ef38b8 PH |
338 | static inline bool tty_throttled(struct tty_struct *tty) |
339 | { | |
340 | return test_bit(TTY_THROTTLED, &tty->flags); | |
341 | } | |
342 | ||
4f73bc4d | 343 | #ifdef CONFIG_TTY |
78941934 JS |
344 | void tty_kref_put(struct tty_struct *tty); |
345 | struct pid *tty_get_pgrp(struct tty_struct *tty); | |
346 | void tty_vhangup_self(void); | |
347 | void disassociate_ctty(int priv); | |
348 | dev_t tty_devnum(struct tty_struct *tty); | |
349 | void proc_clear_tty(struct task_struct *p); | |
350 | struct tty_struct *get_current_tty(void); | |
4f73bc4d | 351 | /* tty_io.c */ |
78941934 JS |
352 | int __init tty_init(void); |
353 | const char *tty_name(const struct tty_struct *tty); | |
354 | struct tty_struct *tty_kopen_exclusive(dev_t device); | |
355 | struct tty_struct *tty_kopen_shared(dev_t device); | |
356 | void tty_kclose(struct tty_struct *tty); | |
357 | int tty_dev_name_to_number(const char *name, dev_t *number); | |
4f73bc4d | 358 | #else |
4f73bc4d JM |
359 | static inline void tty_kref_put(struct tty_struct *tty) |
360 | { } | |
361 | static inline struct pid *tty_get_pgrp(struct tty_struct *tty) | |
362 | { return NULL; } | |
363 | static inline void tty_vhangup_self(void) | |
364 | { } | |
365 | static inline void disassociate_ctty(int priv) | |
366 | { } | |
367 | static inline dev_t tty_devnum(struct tty_struct *tty) | |
368 | { return 0; } | |
369 | static inline void proc_clear_tty(struct task_struct *p) | |
370 | { } | |
371 | static inline struct tty_struct *get_current_tty(void) | |
372 | { return NULL; } | |
373 | /* tty_io.c */ | |
374 | static inline int __init tty_init(void) | |
375 | { return 0; } | |
188e3c5c AB |
376 | static inline const char *tty_name(const struct tty_struct *tty) |
377 | { return "(none)"; } | |
4ea3cd65 | 378 | static inline struct tty_struct *tty_kopen_exclusive(dev_t device) |
a09ac397 OK |
379 | { return ERR_PTR(-ENODEV); } |
380 | static inline void tty_kclose(struct tty_struct *tty) | |
381 | { } | |
fc61ed51 OK |
382 | static inline int tty_dev_name_to_number(const char *name, dev_t *number) |
383 | { return -ENOTSUPP; } | |
4f73bc4d JM |
384 | #endif |
385 | ||
edc6afc5 | 386 | extern struct ktermios tty_std_termios; |
1da177e4 | 387 | |
78941934 | 388 | int vcs_init(void); |
1da177e4 | 389 | |
862d8312 | 390 | extern const struct class tty_class; |
d81ed103 | 391 | |
9c9f4ded AC |
392 | /** |
393 | * tty_kref_get - get a tty reference | |
394 | * @tty: tty device | |
395 | * | |
396 | * Return a new reference to a tty object. The caller must hold | |
397 | * sufficient locks/counts to ensure that their existing reference cannot | |
398 | * go away | |
399 | */ | |
400 | ||
14bfc987 | 401 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
9c9f4ded AC |
402 | { |
403 | if (tty) | |
404 | kref_get(&tty->kref); | |
405 | return tty; | |
406 | } | |
9c9f4ded | 407 | |
78941934 JS |
408 | const char *tty_driver_name(const struct tty_struct *tty); |
409 | void tty_wait_until_sent(struct tty_struct *tty, long timeout); | |
410 | void stop_tty(struct tty_struct *tty); | |
411 | void start_tty(struct tty_struct *tty); | |
412 | void tty_write_message(struct tty_struct *tty, char *msg); | |
413 | int tty_send_xchar(struct tty_struct *tty, char ch); | |
414 | int tty_put_char(struct tty_struct *tty, unsigned char c); | |
415 | unsigned int tty_chars_in_buffer(struct tty_struct *tty); | |
416 | unsigned int tty_write_room(struct tty_struct *tty); | |
417 | void tty_driver_flush_buffer(struct tty_struct *tty); | |
418 | void tty_unthrottle(struct tty_struct *tty); | |
419 | int tty_throttle_safe(struct tty_struct *tty); | |
420 | int tty_unthrottle_safe(struct tty_struct *tty); | |
421 | int tty_do_resize(struct tty_struct *tty, struct winsize *ws); | |
422 | int tty_get_icount(struct tty_struct *tty, | |
423 | struct serial_icounter_struct *icount); | |
424 | int is_current_pgrp_orphaned(void); | |
425 | void tty_hangup(struct tty_struct *tty); | |
426 | void tty_vhangup(struct tty_struct *tty); | |
427 | int tty_hung_up_p(struct file *filp); | |
428 | void do_SAK(struct tty_struct *tty); | |
429 | void __do_SAK(struct tty_struct *tty); | |
430 | void no_tty(void); | |
87888fb9 | 431 | speed_t tty_termios_baud_rate(const struct ktermios *termios); |
78941934 JS |
432 | void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, |
433 | speed_t obaud); | |
434 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, | |
435 | speed_t obaud); | |
6865ff22 JS |
436 | |
437 | /** | |
438 | * tty_get_baud_rate - get tty bit rates | |
439 | * @tty: tty to query | |
440 | * | |
441 | * Returns the baud rate as an integer for this terminal. The | |
442 | * termios lock must be held by the caller and the terminal bit | |
443 | * flags may be updated. | |
444 | * | |
445 | * Locking: none | |
446 | */ | |
447 | static inline speed_t tty_get_baud_rate(struct tty_struct *tty) | |
448 | { | |
449 | return tty_termios_baud_rate(&tty->termios); | |
450 | } | |
451 | ||
654ee49b JS |
452 | unsigned char tty_get_char_size(unsigned int cflag); |
453 | unsigned char tty_get_frame_size(unsigned int cflag); | |
454 | ||
d15f89d9 | 455 | void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old); |
87f22db4 | 456 | bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b); |
78941934 | 457 | int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
1da177e4 | 458 | |
78941934 | 459 | void tty_wakeup(struct tty_struct *tty); |
1da177e4 | 460 | |
dcc223e8 | 461 | int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg); |
78941934 JS |
462 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
463 | struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); | |
464 | void tty_release_struct(struct tty_struct *tty, int idx); | |
465 | void tty_init_termios(struct tty_struct *tty); | |
466 | void tty_save_termios(struct tty_struct *tty); | |
467 | int tty_standard_install(struct tty_driver *driver, | |
66d450e8 | 468 | struct tty_struct *tty); |
24ec839c | 469 | |
70522e12 | 470 | extern struct mutex tty_mutex; |
1da177e4 LT |
471 | |
472 | /* n_tty.c */ | |
78941934 | 473 | void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
0c688614 | 474 | #ifdef CONFIG_TTY |
78941934 | 475 | void __init n_tty_init(void); |
0c688614 NP |
476 | #else |
477 | static inline void n_tty_init(void) { } | |
478 | #endif | |
1da177e4 | 479 | |
522ed776 MT |
480 | /* tty_audit.c */ |
481 | #ifdef CONFIG_AUDIT | |
78941934 JS |
482 | void tty_audit_exit(void); |
483 | void tty_audit_fork(struct signal_struct *sig); | |
484 | int tty_audit_push(void); | |
522ed776 | 485 | #else |
522ed776 MT |
486 | static inline void tty_audit_exit(void) |
487 | { | |
488 | } | |
489 | static inline void tty_audit_fork(struct signal_struct *sig) | |
490 | { | |
491 | } | |
37282a77 | 492 | static inline int tty_audit_push(void) |
522ed776 | 493 | { |
3c80fe4a | 494 | return 0; |
522ed776 | 495 | } |
522ed776 MT |
496 | #endif |
497 | ||
1da177e4 | 498 | /* tty_ioctl.c */ |
7c783601 JS |
499 | int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd, |
500 | unsigned long arg); | |
1da177e4 | 501 | |
1da177e4 LT |
502 | /* vt.c */ |
503 | ||
78941934 | 504 | int vt_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg); |
1da177e4 | 505 | |
78941934 JS |
506 | long vt_compat_ioctl(struct tty_struct *tty, unsigned int cmd, |
507 | unsigned long arg); | |
e9216651 | 508 | |
b07471fa | 509 | /* tty_mutex.c */ |
ec79d605 | 510 | /* functions for preparation of BKL removal */ |
78941934 JS |
511 | void tty_lock(struct tty_struct *tty); |
512 | int tty_lock_interruptible(struct tty_struct *tty); | |
513 | void tty_unlock(struct tty_struct *tty); | |
514 | void tty_lock_slave(struct tty_struct *tty); | |
515 | void tty_unlock_slave(struct tty_struct *tty); | |
516 | void tty_set_lock_subclass(struct tty_struct *tty); | |
be1bc288 | 517 | |
1da177e4 | 518 | #endif |