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> | |
9 | #include <linux/tty_driver.h> | |
10 | #include <linux/tty_ldisc.h> | |
11 | #include <linux/mutex.h> | |
ba3fe7ab | 12 | #include <linux/tty_flags.h> |
fddda2b7 | 13 | #include <linux/seq_file.h> |
607ca46e | 14 | #include <uapi/linux/tty.h> |
6a1c0680 | 15 | #include <linux/rwsem.h> |
809850b7 | 16 | #include <linux/llist.h> |
ae92c1f5 | 17 | |
ae92c1f5 | 18 | |
3abf87cd PH |
19 | /* |
20 | * Lock subclasses for tty locks | |
21 | * | |
22 | * TTY_LOCK_NORMAL is for normal ttys and master ptys. | |
23 | * TTY_LOCK_SLAVE is for slave ptys only. | |
24 | * | |
25 | * Lock subclasses are necessary for handling nested locking with pty pairs. | |
26 | * tty locks which use nested locking: | |
27 | * | |
28 | * legacy_mutex - Nested tty locks are necessary for releasing pty pairs. | |
29 | * The stable lock order is master pty first, then slave pty. | |
d2b6f447 PH |
30 | * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem. |
31 | * Subclassing this lock enables the slave pty to hold its | |
32 | * termios_rwsem when claiming the master tty_buffer lock. | |
1d1d14da PH |
33 | * tty_buffer lock - slave ptys can claim nested buffer lock when handling |
34 | * signal chars. The stable lock order is slave pty, then | |
35 | * master. | |
3abf87cd PH |
36 | */ |
37 | ||
38 | enum { | |
39 | TTY_LOCK_NORMAL = 0, | |
40 | TTY_LOCK_SLAVE, | |
41 | }; | |
ae92c1f5 FF |
42 | |
43 | /* | |
44 | * (Note: the *_driver.minor_start values 1, 64, 128, 192 are | |
45 | * hardcoded at present.) | |
46 | */ | |
47 | #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ | |
e9aba515 | 48 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
ae92c1f5 FF |
49 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
50 | ||
1da177e4 LT |
51 | /* |
52 | * This character is the same as _POSIX_VDISABLE: it cannot be used as | |
53 | * a c_cc[] character, but indicates that a particular special character | |
54 | * isn't in use (eg VINTR has no character etc) | |
55 | */ | |
56 | #define __DISABLED_CHAR '\0' | |
57 | ||
33f0f88f | 58 | struct tty_buffer { |
809850b7 PH |
59 | union { |
60 | struct tty_buffer *next; | |
61 | struct llist_node free; | |
62 | }; | |
33f0f88f AC |
63 | int used; |
64 | int size; | |
8977d929 PF |
65 | int commit; |
66 | int read; | |
acc0f67f | 67 | int flags; |
33f0f88f | 68 | /* Data points here */ |
9d82973e | 69 | unsigned long data[]; |
33f0f88f AC |
70 | }; |
71 | ||
acc0f67f PH |
72 | /* Values for .flags field of tty_buffer */ |
73 | #define TTYB_NORMAL 1 /* buffer has no flags buffer */ | |
74 | ||
1fc359fc PH |
75 | static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) |
76 | { | |
77 | return ((unsigned char *)b->data) + ofs; | |
78 | } | |
79 | ||
80 | static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) | |
81 | { | |
82 | return (char *)char_buf_ptr(b, ofs) + b->size; | |
83 | } | |
84 | ||
33f0f88f | 85 | struct tty_bufhead { |
8c1fb49b | 86 | struct tty_buffer *head; /* Queue head */ |
f23eb2b2 | 87 | struct work_struct work; |
a7c8d58c PH |
88 | struct mutex lock; |
89 | atomic_t priority; | |
7391ee16 | 90 | struct tty_buffer sentinel; |
809850b7 | 91 | struct llist_head free; /* Free queue head */ |
5dda4ca5 | 92 | atomic_t mem_used; /* In-use buffers excluding free list */ |
4d18e6ef | 93 | int mem_limit; |
8c1fb49b | 94 | struct tty_buffer *tail; /* Active buffer */ |
1da177e4 | 95 | }; |
1da177e4 LT |
96 | /* |
97 | * When a break, frame error, or parity error happens, these codes are | |
98 | * stuffed into the flags buffer. | |
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 | ||
adc8d746 AC |
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]) | |
1da177e4 | 123 | |
adc8d746 AC |
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)) | |
7a4d29f4 AC |
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) | |
e58b57a3 | 170 | #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR) |
7a4d29f4 AC |
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) | |
26df6d13 | 187 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
1da177e4 LT |
188 | |
189 | struct device; | |
522ed776 | 190 | struct signal_struct; |
6f67048c AC |
191 | |
192 | /* | |
193 | * Port level information. Each device keeps its own port level information | |
194 | * so provide a common structure for those ports wanting to use common support | |
195 | * routines. | |
196 | * | |
197 | * The tty port has a different lifetime to the tty so must be kept apart. | |
198 | * In addition be careful as tty -> port mappings are valid for the life | |
199 | * of the tty object but in many cases port -> tty mappings are valid only | |
200 | * until a hangup so don't use the wrong path. | |
201 | */ | |
7a4d29f4 | 202 | |
31f35939 AC |
203 | struct tty_port; |
204 | ||
205 | struct tty_port_operations { | |
206 | /* Return 1 if the carrier is raised */ | |
207 | int (*carrier_raised)(struct tty_port *port); | |
7ca0ff9a | 208 | /* Control the DTR line */ |
fcc8ac18 | 209 | void (*dtr_rts)(struct tty_port *port, int raise); |
7ca0ff9a | 210 | /* Called when the last close completes or a hangup finishes |
64bc3979 AC |
211 | IFF the port was initialized. Do not use to free resources. Called |
212 | under the port mutex to serialize against activate/shutdowns */ | |
7ca0ff9a | 213 | void (*shutdown)(struct tty_port *port); |
64bc3979 AC |
214 | /* Called under the port mutex from tty_port_open, serialized using |
215 | the port mutex */ | |
216 | /* FIXME: long term getting the tty argument *out* of this would be | |
217 | good for consoles */ | |
218 | int (*activate)(struct tty_port *port, struct tty_struct *tty); | |
568aafc6 AC |
219 | /* Called on the final put of a port */ |
220 | void (*destruct)(struct tty_port *port); | |
31f35939 | 221 | }; |
c3485ee0 RH |
222 | |
223 | struct 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 | ||
0c5aae59 JH |
228 | extern const struct tty_port_client_operations tty_port_default_client_ops; |
229 | ||
6f67048c | 230 | struct tty_port { |
ecbbfd44 | 231 | struct tty_bufhead buf; /* Locked internally */ |
6f67048c | 232 | struct tty_struct *tty; /* Back pointer */ |
967fab69 | 233 | struct tty_struct *itty; /* internal back ptr */ |
31f35939 | 234 | const struct tty_port_operations *ops; /* Port operations */ |
c3485ee0 | 235 | const struct tty_port_client_operations *client_ops; /* Port client operations */ |
4a90f09b | 236 | spinlock_t lock; /* Lock protecting tty field */ |
6f67048c AC |
237 | int blocked_open; /* Waiting to open */ |
238 | int count; /* Usage count */ | |
239 | wait_queue_head_t open_wait; /* Open waiters */ | |
bdc04e31 | 240 | wait_queue_head_t delta_msr_wait; /* Modem status change */ |
e4d38f33 PH |
241 | unsigned long flags; /* User TTY flags ASYNC_ */ |
242 | unsigned long iflags; /* Internal flags TTY_PORT_ */ | |
0bc1bd09 | 243 | unsigned char console:1; /* port is a console */ |
6f67048c | 244 | struct mutex mutex; /* Locking */ |
44e4909e | 245 | struct mutex buf_mutex; /* Buffer alloc lock */ |
6f67048c | 246 | unsigned char *xmit_buf; /* Optional buffer */ |
5e99df56 AC |
247 | unsigned int close_delay; /* Close port delay */ |
248 | unsigned int closing_wait; /* Delay for output */ | |
1ec739be AC |
249 | int drain_delay; /* Set to zero if no pure time |
250 | based drain is needed else | |
251 | set to size of fifo */ | |
568aafc6 | 252 | struct kref kref; /* Ref counter */ |
c3485ee0 | 253 | void *client_data; |
6f67048c AC |
254 | }; |
255 | ||
e4d38f33 PH |
256 | /* tty_port::iflags bits -- use atomic bit ops */ |
257 | #define TTY_PORT_INITIALIZED 0 /* device is initialized */ | |
258 | #define TTY_PORT_SUSPENDED 1 /* device is suspended */ | |
259 | #define TTY_PORT_ACTIVE 2 /* device is open */ | |
260 | ||
261 | /* | |
262 | * uart drivers: use the uart_port::status field and the UPSTAT_* defines | |
263 | * for s/w-based flow control steering and carrier detection status | |
264 | */ | |
265 | #define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */ | |
266 | #define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */ | |
a09ac397 OK |
267 | #define TTY_PORT_KOPENED 5 /* device exclusively opened by |
268 | kernel */ | |
e4d38f33 | 269 | |
1da177e4 LT |
270 | /* |
271 | * Where all of the state associated with a tty is kept while the tty | |
272 | * is open. Since the termios state should be kept even if the tty | |
273 | * has been closed --- for things like the baud rate, etc --- it is | |
274 | * not stored here, but rather a pointer to the real state is stored | |
275 | * here. Possible the winsize structure should have the same | |
276 | * treatment, but (1) the default 80x24 is usually right and (2) it's | |
277 | * most often used by a windowing system, which will set the correct | |
278 | * size each time the window is created or resized anyway. | |
279 | * - TYT, 9/14/92 | |
280 | */ | |
f34d7a5b AC |
281 | |
282 | struct tty_operations; | |
283 | ||
1da177e4 LT |
284 | struct tty_struct { |
285 | int magic; | |
9c9f4ded | 286 | struct kref kref; |
86b20677 | 287 | struct device *dev; /* class device or NULL (e.g. ptys, serdev) */ |
1da177e4 | 288 | struct tty_driver *driver; |
f34d7a5b | 289 | const struct tty_operations *ops; |
1da177e4 | 290 | int index; |
c65c9bc3 AC |
291 | |
292 | /* Protects ldisc changes: Lock tty not pty */ | |
36697529 | 293 | struct ld_semaphore ldisc_sem; |
c65c9bc3 AC |
294 | struct tty_ldisc *ldisc; |
295 | ||
bddc7152 | 296 | struct mutex atomic_write_lock; |
89c8d91e | 297 | struct mutex legacy_mutex; |
d8c1f929 | 298 | struct mutex throttle_mutex; |
6a1c0680 | 299 | struct rw_semaphore termios_rwsem; |
dee4a0be | 300 | struct mutex winsize_mutex; |
04f378b1 | 301 | spinlock_t ctrl_lock; |
f9e053dc | 302 | spinlock_t flow_lock; |
6a1c0680 | 303 | /* Termios values are protected by the termios rwsem */ |
adc8d746 | 304 | struct ktermios termios, termios_locked; |
1da177e4 | 305 | char name[64]; |
47f86834 | 306 | struct pid *pgrp; /* Protected by ctrl lock */ |
c8bcd9c5 JH |
307 | /* |
308 | * Writes protected by both ctrl lock and legacy mutex, readers must use | |
309 | * at least one of them. | |
310 | */ | |
ab521dc0 | 311 | struct pid *session; |
1da177e4 LT |
312 | unsigned long flags; |
313 | int count; | |
dee4a0be | 314 | struct winsize winsize; /* winsize_mutex */ |
c545b66c PH |
315 | unsigned long stopped:1, /* flow_lock */ |
316 | flow_stopped:1, | |
cc952e70 | 317 | unused:BITS_PER_LONG - 2; |
d7a855bd | 318 | int hw_stopped; |
99416322 PH |
319 | unsigned long ctrl_status:8, /* ctrl_lock */ |
320 | packet:1, | |
cc952e70 | 321 | unused_ctrl:BITS_PER_LONG - 9; |
33f0f88f | 322 | unsigned int receive_room; /* Bytes free for queue */ |
70bc1264 | 323 | int flow_change; |
1da177e4 LT |
324 | |
325 | struct tty_struct *link; | |
326 | struct fasync_struct *fasync; | |
1da177e4 LT |
327 | wait_queue_head_t write_wait; |
328 | wait_queue_head_t read_wait; | |
329 | struct work_struct hangup_work; | |
330 | void *disc_data; | |
331 | void *driver_data; | |
4a510969 | 332 | spinlock_t files_lock; /* protects tty_files list */ |
1da177e4 LT |
333 | struct list_head tty_files; |
334 | ||
335 | #define N_TTY_BUF_SIZE 4096 | |
6f67048c | 336 | |
413ba638 | 337 | int closing; |
1da177e4 LT |
338 | unsigned char *write_buf; |
339 | int write_cnt; | |
1da177e4 LT |
340 | /* If the tty has a pending do_SAK, queue it here - akpm */ |
341 | struct work_struct SAK_work; | |
6f67048c | 342 | struct tty_port *port; |
3859a271 | 343 | } __randomize_layout; |
1da177e4 | 344 | |
d996b62a NP |
345 | /* Each of a tty's open files has private_data pointing to tty_file_private */ |
346 | struct tty_file_private { | |
347 | struct tty_struct *tty; | |
348 | struct file *file; | |
349 | struct list_head list; | |
350 | }; | |
351 | ||
1da177e4 LT |
352 | /* tty magic number */ |
353 | #define TTY_MAGIC 0x5401 | |
354 | ||
355 | /* | |
356 | * These bits are used in the flags field of the tty structure. | |
7a4d29f4 | 357 | * |
1da177e4 LT |
358 | * So that interrupts won't be able to mess up the queues, |
359 | * copy_to_cooked must be atomic with respect to itself, as must | |
360 | * tty->write. Thus, you must use the inline functions set_bit() and | |
361 | * clear_bit() to make things atomic. | |
362 | */ | |
363 | #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ | |
7a4d29f4 | 364 | #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ |
1da177e4 LT |
365 | #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ |
366 | #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ | |
1da177e4 | 367 | #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ |
c65c9bc3 | 368 | #define TTY_LDISC_OPEN 11 /* Line discipline is open */ |
1da177e4 LT |
369 | #define TTY_PTY_LOCK 16 /* pty private */ |
370 | #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ | |
371 | #define TTY_HUPPED 18 /* Post driver->hangup() */ | |
28b0f8a6 | 372 | #define TTY_HUPPING 19 /* Hangup in progress */ |
c96cf923 | 373 | #define TTY_LDISC_CHANGING 20 /* Change pending - non-block IO */ |
21622939 | 374 | #define TTY_LDISC_HALTED 22 /* Line discipline is halted */ |
1da177e4 | 375 | |
70bc1264 PH |
376 | /* Values for tty->flow_change */ |
377 | #define TTY_THROTTLE_SAFE 1 | |
378 | #define TTY_UNTHROTTLE_SAFE 2 | |
379 | ||
380 | static inline void __tty_set_flow_change(struct tty_struct *tty, int val) | |
381 | { | |
382 | tty->flow_change = val; | |
383 | } | |
384 | ||
385 | static inline void tty_set_flow_change(struct tty_struct *tty, int val) | |
386 | { | |
387 | tty->flow_change = val; | |
388 | smp_mb(); | |
389 | } | |
390 | ||
c96cf923 DS |
391 | static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file) |
392 | { | |
393 | return file->f_flags & O_NONBLOCK || | |
394 | test_bit(TTY_LDISC_CHANGING, &tty->flags); | |
395 | } | |
396 | ||
18900ca6 PH |
397 | static inline bool tty_io_error(struct tty_struct *tty) |
398 | { | |
399 | return test_bit(TTY_IO_ERROR, &tty->flags); | |
400 | } | |
401 | ||
97ef38b8 PH |
402 | static inline bool tty_throttled(struct tty_struct *tty) |
403 | { | |
404 | return test_bit(TTY_THROTTLED, &tty->flags); | |
405 | } | |
406 | ||
4f73bc4d | 407 | #ifdef CONFIG_TTY |
4f73bc4d JM |
408 | extern void tty_kref_put(struct tty_struct *tty); |
409 | extern struct pid *tty_get_pgrp(struct tty_struct *tty); | |
410 | extern void tty_vhangup_self(void); | |
411 | extern void disassociate_ctty(int priv); | |
412 | extern dev_t tty_devnum(struct tty_struct *tty); | |
413 | extern void proc_clear_tty(struct task_struct *p); | |
414 | extern struct tty_struct *get_current_tty(void); | |
415 | /* tty_io.c */ | |
416 | extern int __init tty_init(void); | |
188e3c5c | 417 | extern const char *tty_name(const struct tty_struct *tty); |
4ea3cd65 UKK |
418 | extern struct tty_struct *tty_kopen_exclusive(dev_t device); |
419 | extern struct tty_struct *tty_kopen_shared(dev_t device); | |
a09ac397 | 420 | extern void tty_kclose(struct tty_struct *tty); |
fc61ed51 | 421 | extern int tty_dev_name_to_number(const char *name, dev_t *number); |
b027e229 GK |
422 | extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout); |
423 | extern void tty_ldisc_unlock(struct tty_struct *tty); | |
9f12e37c | 424 | extern ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *); |
f446776e | 425 | extern struct file *tty_release_redirect(struct tty_struct *tty); |
4f73bc4d | 426 | #else |
4f73bc4d JM |
427 | static inline void tty_kref_put(struct tty_struct *tty) |
428 | { } | |
429 | static inline struct pid *tty_get_pgrp(struct tty_struct *tty) | |
430 | { return NULL; } | |
431 | static inline void tty_vhangup_self(void) | |
432 | { } | |
433 | static inline void disassociate_ctty(int priv) | |
434 | { } | |
435 | static inline dev_t tty_devnum(struct tty_struct *tty) | |
436 | { return 0; } | |
437 | static inline void proc_clear_tty(struct task_struct *p) | |
438 | { } | |
439 | static inline struct tty_struct *get_current_tty(void) | |
440 | { return NULL; } | |
441 | /* tty_io.c */ | |
442 | static inline int __init tty_init(void) | |
443 | { return 0; } | |
188e3c5c AB |
444 | static inline const char *tty_name(const struct tty_struct *tty) |
445 | { return "(none)"; } | |
4ea3cd65 | 446 | static inline struct tty_struct *tty_kopen_exclusive(dev_t device) |
a09ac397 OK |
447 | { return ERR_PTR(-ENODEV); } |
448 | static inline void tty_kclose(struct tty_struct *tty) | |
449 | { } | |
fc61ed51 OK |
450 | static inline int tty_dev_name_to_number(const char *name, dev_t *number) |
451 | { return -ENOTSUPP; } | |
4f73bc4d JM |
452 | #endif |
453 | ||
edc6afc5 | 454 | extern struct ktermios tty_std_termios; |
1da177e4 | 455 | |
1da177e4 LT |
456 | extern int vcs_init(void); |
457 | ||
d81ed103 AC |
458 | extern struct class *tty_class; |
459 | ||
9c9f4ded AC |
460 | /** |
461 | * tty_kref_get - get a tty reference | |
462 | * @tty: tty device | |
463 | * | |
464 | * Return a new reference to a tty object. The caller must hold | |
465 | * sufficient locks/counts to ensure that their existing reference cannot | |
466 | * go away | |
467 | */ | |
468 | ||
14bfc987 | 469 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
9c9f4ded AC |
470 | { |
471 | if (tty) | |
472 | kref_get(&tty->kref); | |
473 | return tty; | |
474 | } | |
9c9f4ded | 475 | |
0a083edd | 476 | extern const char *tty_driver_name(const struct tty_struct *tty); |
7a4d29f4 | 477 | extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
2812d9e9 | 478 | extern int __tty_check_change(struct tty_struct *tty, int sig); |
7a4d29f4 | 479 | extern int tty_check_change(struct tty_struct *tty); |
f9e053dc | 480 | extern void __stop_tty(struct tty_struct *tty); |
7a4d29f4 | 481 | extern void stop_tty(struct tty_struct *tty); |
f9e053dc | 482 | extern void __start_tty(struct tty_struct *tty); |
7a4d29f4 | 483 | extern void start_tty(struct tty_struct *tty); |
1da177e4 | 484 | extern int tty_register_driver(struct tty_driver *driver); |
a872ab4d | 485 | extern void tty_unregister_driver(struct tty_driver *driver); |
01107d34 GKH |
486 | extern struct device *tty_register_device(struct tty_driver *driver, |
487 | unsigned index, struct device *dev); | |
6915c0e4 TH |
488 | extern struct device *tty_register_device_attr(struct tty_driver *driver, |
489 | unsigned index, struct device *device, | |
490 | void *drvdata, | |
491 | const struct attribute_group **attr_grp); | |
1da177e4 | 492 | extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
1da177e4 | 493 | extern void tty_write_message(struct tty_struct *tty, char *msg); |
136d5258 | 494 | extern int tty_send_xchar(struct tty_struct *tty, char ch); |
f34d7a5b AC |
495 | extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
496 | extern int tty_chars_in_buffer(struct tty_struct *tty); | |
497 | extern int tty_write_room(struct tty_struct *tty); | |
498 | extern void tty_driver_flush_buffer(struct tty_struct *tty); | |
39c2e60f AC |
499 | extern void tty_throttle(struct tty_struct *tty); |
500 | extern void tty_unthrottle(struct tty_struct *tty); | |
70bc1264 PH |
501 | extern int tty_throttle_safe(struct tty_struct *tty); |
502 | extern int tty_unthrottle_safe(struct tty_struct *tty); | |
fc6f6238 | 503 | extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
d20c219c UKK |
504 | extern int tty_get_icount(struct tty_struct *tty, |
505 | struct serial_icounter_struct *icount); | |
3e7cd6c4 | 506 | extern int is_current_pgrp_orphaned(void); |
7a4d29f4 AC |
507 | extern void tty_hangup(struct tty_struct *tty); |
508 | extern void tty_vhangup(struct tty_struct *tty); | |
a1235b3e | 509 | extern void tty_vhangup_session(struct tty_struct *tty); |
7a4d29f4 | 510 | extern int tty_hung_up_p(struct file *filp); |
1da177e4 | 511 | extern void do_SAK(struct tty_struct *tty); |
8b6312f4 | 512 | extern void __do_SAK(struct tty_struct *tty); |
a1235b3e NP |
513 | extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty); |
514 | extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session); | |
515 | extern void session_clear_tty(struct pid *session); | |
98a27ba4 | 516 | extern void no_tty(void); |
ecbbfd44 | 517 | extern void tty_buffer_free_all(struct tty_port *port); |
86c80a8e | 518 | extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld); |
ecbbfd44 | 519 | extern void tty_buffer_init(struct tty_port *port); |
1d1d14da | 520 | extern void tty_buffer_set_lock_subclass(struct tty_port *port); |
e176058f PH |
521 | extern bool tty_buffer_restart_work(struct tty_port *port); |
522 | extern bool tty_buffer_cancel_work(struct tty_port *port); | |
0f40fbbc | 523 | extern void tty_buffer_flush_work(struct tty_port *port); |
edc6afc5 AC |
524 | extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
525 | extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); | |
7a4d29f4 AC |
526 | extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
527 | speed_t ibaud, speed_t obaud); | |
528 | extern void tty_encode_baud_rate(struct tty_struct *tty, | |
529 | speed_t ibaud, speed_t obaud); | |
6865ff22 JS |
530 | |
531 | /** | |
532 | * tty_get_baud_rate - get tty bit rates | |
533 | * @tty: tty to query | |
534 | * | |
535 | * Returns the baud rate as an integer for this terminal. The | |
536 | * termios lock must be held by the caller and the terminal bit | |
537 | * flags may be updated. | |
538 | * | |
539 | * Locking: none | |
540 | */ | |
541 | static inline speed_t tty_get_baud_rate(struct tty_struct *tty) | |
542 | { | |
543 | return tty_termios_baud_rate(&tty->termios); | |
544 | } | |
545 | ||
5f519d72 | 546 | extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
7b0c6b38 | 547 | extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b); |
b00f5c2d | 548 | extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
1da177e4 LT |
549 | |
550 | extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); | |
551 | extern void tty_ldisc_deref(struct tty_ldisc *); | |
552 | extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); | |
892d1fa7 PH |
553 | extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset); |
554 | extern int tty_ldisc_reinit(struct tty_struct *tty, int disc); | |
fddda2b7 | 555 | extern const struct seq_operations tty_ldiscs_seq_ops; |
1da177e4 LT |
556 | |
557 | extern void tty_wakeup(struct tty_struct *tty); | |
558 | extern void tty_ldisc_flush(struct tty_struct *tty); | |
559 | ||
04f378b1 | 560 | extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
0fc00e24 AC |
561 | extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
562 | unsigned int cmd, unsigned long arg); | |
a1235b3e NP |
563 | extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty, |
564 | struct file *file, unsigned int cmd, unsigned long arg); | |
0fc00e24 | 565 | extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
d81ed103 | 566 | extern void tty_default_fops(struct file_operations *fops); |
2c964a2f | 567 | extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx); |
fa90e1c9 JS |
568 | extern int tty_alloc_file(struct file *file); |
569 | extern void tty_add_file(struct tty_struct *tty, struct file *file); | |
570 | extern void tty_free_file(struct file *file); | |
593a27c4 | 571 | extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); |
9ed90d20 | 572 | extern void tty_release_struct(struct tty_struct *tty, int idx); |
eeb89d91 | 573 | extern int tty_release(struct inode *inode, struct file *filp); |
a3123fd0 | 574 | extern void tty_init_termios(struct tty_struct *tty); |
f51ccf46 | 575 | extern void tty_save_termios(struct tty_struct *tty); |
66d450e8 JS |
576 | extern int tty_standard_install(struct tty_driver *driver, |
577 | struct tty_struct *tty); | |
24ec839c | 578 | |
70522e12 | 579 | extern struct mutex tty_mutex; |
1da177e4 | 580 | |
9c1729db AC |
581 | #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
582 | ||
6f67048c | 583 | extern void tty_port_init(struct tty_port *port); |
2cb4ca02 JS |
584 | extern void tty_port_link_device(struct tty_port *port, |
585 | struct tty_driver *driver, unsigned index); | |
057eb856 JS |
586 | extern struct device *tty_port_register_device(struct tty_port *port, |
587 | struct tty_driver *driver, unsigned index, | |
588 | struct device *device); | |
b1b79916 TH |
589 | extern struct device *tty_port_register_device_attr(struct tty_port *port, |
590 | struct tty_driver *driver, unsigned index, | |
591 | struct device *device, void *drvdata, | |
592 | const struct attribute_group **attr_grp); | |
8cde11b2 JH |
593 | extern struct device *tty_port_register_device_serdev(struct tty_port *port, |
594 | struct tty_driver *driver, unsigned index, | |
595 | struct device *device); | |
596 | extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port, | |
597 | struct tty_driver *driver, unsigned index, | |
598 | struct device *device, void *drvdata, | |
599 | const struct attribute_group **attr_grp); | |
600 | extern void tty_port_unregister_device(struct tty_port *port, | |
601 | struct tty_driver *driver, unsigned index); | |
6f67048c AC |
602 | extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
603 | extern void tty_port_free_xmit_buf(struct tty_port *port); | |
de274bfe | 604 | extern void tty_port_destroy(struct tty_port *port); |
568aafc6 AC |
605 | extern void tty_port_put(struct tty_port *port); |
606 | ||
2427b8e3 | 607 | static inline struct tty_port *tty_port_get(struct tty_port *port) |
568aafc6 | 608 | { |
c0fdfb80 PH |
609 | if (port && kref_get_unless_zero(&port->kref)) |
610 | return port; | |
611 | return NULL; | |
568aafc6 AC |
612 | } |
613 | ||
f21ec3d2 | 614 | /* If the cts flow control is enabled, return true. */ |
9e179272 | 615 | static inline bool tty_port_cts_enabled(const struct tty_port *port) |
f21ec3d2 | 616 | { |
5604a98e | 617 | return test_bit(TTY_PORT_CTS_FLOW, &port->iflags); |
f21ec3d2 HS |
618 | } |
619 | ||
5604a98e PH |
620 | static inline void tty_port_set_cts_flow(struct tty_port *port, bool val) |
621 | { | |
af633212 | 622 | assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val); |
5604a98e PH |
623 | } |
624 | ||
9e179272 | 625 | static inline bool tty_port_active(const struct tty_port *port) |
807c8d81 PH |
626 | { |
627 | return test_bit(TTY_PORT_ACTIVE, &port->iflags); | |
628 | } | |
629 | ||
630 | static inline void tty_port_set_active(struct tty_port *port, bool val) | |
631 | { | |
af633212 | 632 | assign_bit(TTY_PORT_ACTIVE, &port->iflags, val); |
807c8d81 | 633 | } |
5604a98e | 634 | |
9e179272 | 635 | static inline bool tty_port_check_carrier(const struct tty_port *port) |
2d68655d PH |
636 | { |
637 | return test_bit(TTY_PORT_CHECK_CD, &port->iflags); | |
638 | } | |
639 | ||
640 | static inline void tty_port_set_check_carrier(struct tty_port *port, bool val) | |
641 | { | |
af633212 | 642 | assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val); |
2d68655d PH |
643 | } |
644 | ||
9e179272 | 645 | static inline bool tty_port_suspended(const struct tty_port *port) |
80f02d54 PH |
646 | { |
647 | return test_bit(TTY_PORT_SUSPENDED, &port->iflags); | |
648 | } | |
649 | ||
650 | static inline void tty_port_set_suspended(struct tty_port *port, bool val) | |
651 | { | |
af633212 | 652 | assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val); |
80f02d54 PH |
653 | } |
654 | ||
9e179272 | 655 | static inline bool tty_port_initialized(const struct tty_port *port) |
d41861ca PH |
656 | { |
657 | return test_bit(TTY_PORT_INITIALIZED, &port->iflags); | |
658 | } | |
659 | ||
660 | static inline void tty_port_set_initialized(struct tty_port *port, bool val) | |
661 | { | |
af633212 | 662 | assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val); |
f21ec3d2 HS |
663 | } |
664 | ||
9e179272 | 665 | static inline bool tty_port_kopened(const struct tty_port *port) |
a09ac397 OK |
666 | { |
667 | return test_bit(TTY_PORT_KOPENED, &port->iflags); | |
668 | } | |
669 | ||
670 | static inline void tty_port_set_kopened(struct tty_port *port, bool val) | |
671 | { | |
af633212 | 672 | assign_bit(TTY_PORT_KOPENED, &port->iflags, val); |
a09ac397 OK |
673 | } |
674 | ||
4a90f09b AC |
675 | extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
676 | extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); | |
31f35939 | 677 | extern int tty_port_carrier_raised(struct tty_port *port); |
5d951fb4 | 678 | extern void tty_port_raise_dtr_rts(struct tty_port *port); |
fcc8ac18 | 679 | extern void tty_port_lower_dtr_rts(struct tty_port *port); |
3e61696b | 680 | extern void tty_port_hangup(struct tty_port *port); |
aa27a094 | 681 | extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); |
6aad04f2 | 682 | extern void tty_port_tty_wakeup(struct tty_port *port); |
36c621d8 AC |
683 | extern int tty_port_block_til_ready(struct tty_port *port, |
684 | struct tty_struct *tty, struct file *filp); | |
a6614999 AC |
685 | extern int tty_port_close_start(struct tty_port *port, |
686 | struct tty_struct *tty, struct file *filp); | |
687 | extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); | |
7ca0ff9a AC |
688 | extern void tty_port_close(struct tty_port *port, |
689 | struct tty_struct *tty, struct file *filp); | |
695586ca JS |
690 | extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
691 | struct tty_struct *tty); | |
64bc3979 AC |
692 | extern int tty_port_open(struct tty_port *port, |
693 | struct tty_struct *tty, struct file *filp); | |
2427b8e3 | 694 | static inline int tty_port_users(struct tty_port *port) |
b58d13a0 AC |
695 | { |
696 | return port->count + port->blocked_open; | |
697 | } | |
698 | ||
01e1abb2 AC |
699 | extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
700 | extern int tty_unregister_ldisc(int disc); | |
c12da96f | 701 | extern int tty_set_ldisc(struct tty_struct *tty, int disc); |
01e1abb2 | 702 | extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
62462aef | 703 | extern void tty_ldisc_release(struct tty_struct *tty); |
903f9db1 | 704 | extern int __must_check tty_ldisc_init(struct tty_struct *tty); |
6716671d | 705 | extern void tty_ldisc_deinit(struct tty_struct *tty); |
c92d781f | 706 | extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p, |
8d082cd3 | 707 | char *f, int count); |
aec51036 | 708 | extern void tty_sysctl_init(void); |
9c1729db | 709 | |
1da177e4 | 710 | /* n_tty.c */ |
572b9adb | 711 | extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
0c688614 | 712 | #ifdef CONFIG_TTY |
27228732 | 713 | extern void __init n_tty_init(void); |
0c688614 NP |
714 | #else |
715 | static inline void n_tty_init(void) { } | |
716 | #endif | |
1da177e4 | 717 | |
522ed776 MT |
718 | /* tty_audit.c */ |
719 | #ifdef CONFIG_AUDIT | |
6b2a3d62 | 720 | extern void tty_audit_add_data(struct tty_struct *tty, const void *data, |
309426ae | 721 | size_t size); |
522ed776 MT |
722 | extern void tty_audit_exit(void); |
723 | extern void tty_audit_fork(struct signal_struct *sig); | |
1e641743 | 724 | extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
37282a77 | 725 | extern int tty_audit_push(void); |
522ed776 | 726 | #else |
6b2a3d62 | 727 | static inline void tty_audit_add_data(struct tty_struct *tty, const void *data, |
309426ae | 728 | size_t size) |
522ed776 MT |
729 | { |
730 | } | |
1e641743 AV |
731 | static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
732 | { | |
733 | } | |
522ed776 MT |
734 | static inline void tty_audit_exit(void) |
735 | { | |
736 | } | |
737 | static inline void tty_audit_fork(struct signal_struct *sig) | |
738 | { | |
739 | } | |
37282a77 | 740 | static inline int tty_audit_push(void) |
522ed776 | 741 | { |
3c80fe4a | 742 | return 0; |
522ed776 | 743 | } |
522ed776 MT |
744 | #endif |
745 | ||
1da177e4 | 746 | /* tty_ioctl.c */ |
47afa7a5 | 747 | extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
1da177e4 LT |
748 | unsigned int cmd, unsigned long arg); |
749 | ||
1da177e4 LT |
750 | /* vt.c */ |
751 | ||
6caa76b7 | 752 | extern int vt_ioctl(struct tty_struct *tty, |
1da177e4 LT |
753 | unsigned int cmd, unsigned long arg); |
754 | ||
94c2273d | 755 | extern long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
756 | unsigned int cmd, unsigned long arg); |
757 | ||
b07471fa | 758 | /* tty_mutex.c */ |
ec79d605 | 759 | /* functions for preparation of BKL removal */ |
c2bb524b | 760 | extern void tty_lock(struct tty_struct *tty); |
0bfd464d | 761 | extern int tty_lock_interruptible(struct tty_struct *tty); |
c2bb524b PH |
762 | extern void tty_unlock(struct tty_struct *tty); |
763 | extern void tty_lock_slave(struct tty_struct *tty); | |
764 | extern void tty_unlock_slave(struct tty_struct *tty); | |
2febdb63 | 765 | extern void tty_set_lock_subclass(struct tty_struct *tty); |
be1bc288 | 766 | |
34db8aaf DH |
767 | #ifdef CONFIG_PROC_FS |
768 | extern void proc_tty_register_driver(struct tty_driver *); | |
769 | extern void proc_tty_unregister_driver(struct tty_driver *); | |
770 | #else | |
771 | static inline void proc_tty_register_driver(struct tty_driver *d) {} | |
772 | static inline void proc_tty_unregister_driver(struct tty_driver *d) {} | |
773 | #endif | |
be1bc288 | 774 | |
1da177e4 | 775 | #endif |