Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_TTY_H |
2 | #define _LINUX_TTY_H | |
3 | ||
ae92c1f5 FF |
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> | |
ba3fe7ab | 11 | #include <linux/tty_flags.h> |
607ca46e | 12 | #include <uapi/linux/tty.h> |
6a1c0680 | 13 | #include <linux/rwsem.h> |
809850b7 | 14 | #include <linux/llist.h> |
ae92c1f5 | 15 | |
ae92c1f5 FF |
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 */ | |
e9aba515 | 23 | #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */ |
ae92c1f5 FF |
24 | #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ |
25 | ||
1da177e4 LT |
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 | ||
33f0f88f | 33 | struct tty_buffer { |
809850b7 PH |
34 | union { |
35 | struct tty_buffer *next; | |
36 | struct llist_node free; | |
37 | }; | |
33f0f88f AC |
38 | int used; |
39 | int size; | |
8977d929 PF |
40 | int commit; |
41 | int read; | |
33f0f88f AC |
42 | /* Data points here */ |
43 | unsigned long data[0]; | |
44 | }; | |
45 | ||
1fc359fc PH |
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 | ||
33f0f88f | 56 | struct tty_bufhead { |
8c1fb49b | 57 | struct tty_buffer *head; /* Queue head */ |
f23eb2b2 | 58 | struct work_struct work; |
a7c8d58c PH |
59 | struct mutex lock; |
60 | atomic_t priority; | |
7391ee16 | 61 | struct tty_buffer sentinel; |
809850b7 | 62 | struct llist_head free; /* Free queue head */ |
7bfe0b71 | 63 | atomic_t memory_used; /* In-use buffers excluding free list */ |
8c1fb49b | 64 | struct tty_buffer *tail; /* Active buffer */ |
1da177e4 | 65 | }; |
1da177e4 LT |
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 | ||
adc8d746 AC |
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]) | |
1da177e4 | 93 | |
adc8d746 AC |
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)) | |
7a4d29f4 AC |
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) | |
26df6d13 | 156 | #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC) |
1da177e4 LT |
157 | |
158 | struct device; | |
522ed776 | 159 | struct signal_struct; |
6f67048c AC |
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 | */ | |
7a4d29f4 | 171 | |
31f35939 AC |
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); | |
7ca0ff9a | 177 | /* Control the DTR line */ |
fcc8ac18 | 178 | void (*dtr_rts)(struct tty_port *port, int raise); |
7ca0ff9a | 179 | /* Called when the last close completes or a hangup finishes |
64bc3979 AC |
180 | IFF the port was initialized. Do not use to free resources. Called |
181 | under the port mutex to serialize against activate/shutdowns */ | |
7ca0ff9a AC |
182 | void (*shutdown)(struct tty_port *port); |
183 | void (*drop)(struct tty_port *port); | |
64bc3979 AC |
184 | /* Called under the port mutex from tty_port_open, serialized using |
185 | the port mutex */ | |
186 | /* FIXME: long term getting the tty argument *out* of this would be | |
187 | good for consoles */ | |
188 | int (*activate)(struct tty_port *port, struct tty_struct *tty); | |
568aafc6 AC |
189 | /* Called on the final put of a port */ |
190 | void (*destruct)(struct tty_port *port); | |
31f35939 AC |
191 | }; |
192 | ||
6f67048c | 193 | struct tty_port { |
ecbbfd44 | 194 | struct tty_bufhead buf; /* Locked internally */ |
6f67048c | 195 | struct tty_struct *tty; /* Back pointer */ |
967fab69 | 196 | struct tty_struct *itty; /* internal back ptr */ |
31f35939 | 197 | const struct tty_port_operations *ops; /* Port operations */ |
4a90f09b | 198 | spinlock_t lock; /* Lock protecting tty field */ |
6f67048c AC |
199 | int blocked_open; /* Waiting to open */ |
200 | int count; /* Usage count */ | |
201 | wait_queue_head_t open_wait; /* Open waiters */ | |
202 | wait_queue_head_t close_wait; /* Close waiters */ | |
bdc04e31 | 203 | wait_queue_head_t delta_msr_wait; /* Modem status change */ |
6f67048c | 204 | unsigned long flags; /* TTY flags ASY_*/ |
d6c53c0e JS |
205 | unsigned char console:1, /* port is a console */ |
206 | low_latency:1; /* direct buffer flush */ | |
6f67048c | 207 | struct mutex mutex; /* Locking */ |
44e4909e | 208 | struct mutex buf_mutex; /* Buffer alloc lock */ |
6f67048c | 209 | unsigned char *xmit_buf; /* Optional buffer */ |
5e99df56 AC |
210 | unsigned int close_delay; /* Close port delay */ |
211 | unsigned int closing_wait; /* Delay for output */ | |
1ec739be AC |
212 | int drain_delay; /* Set to zero if no pure time |
213 | based drain is needed else | |
214 | set to size of fifo */ | |
568aafc6 | 215 | struct kref kref; /* Ref counter */ |
6f67048c AC |
216 | }; |
217 | ||
1da177e4 LT |
218 | /* |
219 | * Where all of the state associated with a tty is kept while the tty | |
220 | * is open. Since the termios state should be kept even if the tty | |
221 | * has been closed --- for things like the baud rate, etc --- it is | |
222 | * not stored here, but rather a pointer to the real state is stored | |
223 | * here. Possible the winsize structure should have the same | |
224 | * treatment, but (1) the default 80x24 is usually right and (2) it's | |
225 | * most often used by a windowing system, which will set the correct | |
226 | * size each time the window is created or resized anyway. | |
227 | * - TYT, 9/14/92 | |
228 | */ | |
f34d7a5b AC |
229 | |
230 | struct tty_operations; | |
231 | ||
1da177e4 LT |
232 | struct tty_struct { |
233 | int magic; | |
9c9f4ded | 234 | struct kref kref; |
30004ac9 | 235 | struct device *dev; |
1da177e4 | 236 | struct tty_driver *driver; |
f34d7a5b | 237 | const struct tty_operations *ops; |
1da177e4 | 238 | int index; |
c65c9bc3 AC |
239 | |
240 | /* Protects ldisc changes: Lock tty not pty */ | |
36697529 | 241 | struct ld_semaphore ldisc_sem; |
c65c9bc3 AC |
242 | struct tty_ldisc *ldisc; |
243 | ||
bddc7152 | 244 | struct mutex atomic_write_lock; |
89c8d91e | 245 | struct mutex legacy_mutex; |
d8c1f929 | 246 | struct mutex throttle_mutex; |
6a1c0680 | 247 | struct rw_semaphore termios_rwsem; |
dee4a0be | 248 | struct mutex winsize_mutex; |
04f378b1 | 249 | spinlock_t ctrl_lock; |
6a1c0680 | 250 | /* Termios values are protected by the termios rwsem */ |
adc8d746 | 251 | struct ktermios termios, termios_locked; |
1d65b4a0 | 252 | struct termiox *termiox; /* May be NULL for unsupported */ |
1da177e4 | 253 | char name[64]; |
47f86834 | 254 | struct pid *pgrp; /* Protected by ctrl lock */ |
ab521dc0 | 255 | struct pid *session; |
1da177e4 LT |
256 | unsigned long flags; |
257 | int count; | |
dee4a0be | 258 | struct winsize winsize; /* winsize_mutex */ |
1da177e4 | 259 | unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; |
47f86834 | 260 | unsigned char ctrl_status; /* ctrl_lock */ |
33f0f88f | 261 | unsigned int receive_room; /* Bytes free for queue */ |
70bc1264 | 262 | int flow_change; |
1da177e4 LT |
263 | |
264 | struct tty_struct *link; | |
265 | struct fasync_struct *fasync; | |
1da177e4 LT |
266 | int alt_speed; /* For magic substitution of 38400 bps */ |
267 | wait_queue_head_t write_wait; | |
268 | wait_queue_head_t read_wait; | |
269 | struct work_struct hangup_work; | |
270 | void *disc_data; | |
271 | void *driver_data; | |
272 | struct list_head tty_files; | |
273 | ||
274 | #define N_TTY_BUF_SIZE 4096 | |
6f67048c | 275 | |
1da177e4 | 276 | unsigned char closing:1; |
1da177e4 LT |
277 | unsigned char *write_buf; |
278 | int write_cnt; | |
1da177e4 LT |
279 | /* If the tty has a pending do_SAK, queue it here - akpm */ |
280 | struct work_struct SAK_work; | |
6f67048c | 281 | struct tty_port *port; |
1da177e4 LT |
282 | }; |
283 | ||
d996b62a NP |
284 | /* Each of a tty's open files has private_data pointing to tty_file_private */ |
285 | struct tty_file_private { | |
286 | struct tty_struct *tty; | |
287 | struct file *file; | |
288 | struct list_head list; | |
289 | }; | |
290 | ||
1da177e4 LT |
291 | /* tty magic number */ |
292 | #define TTY_MAGIC 0x5401 | |
293 | ||
294 | /* | |
295 | * These bits are used in the flags field of the tty structure. | |
7a4d29f4 | 296 | * |
1da177e4 LT |
297 | * So that interrupts won't be able to mess up the queues, |
298 | * copy_to_cooked must be atomic with respect to itself, as must | |
299 | * tty->write. Thus, you must use the inline functions set_bit() and | |
300 | * clear_bit() to make things atomic. | |
301 | */ | |
302 | #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */ | |
7a4d29f4 | 303 | #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */ |
1da177e4 LT |
304 | #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */ |
305 | #define TTY_EXCLUSIVE 3 /* Exclusive open mode */ | |
306 | #define TTY_DEBUG 4 /* Debugging */ | |
307 | #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ | |
1da177e4 | 308 | #define TTY_CLOSING 7 /* ->close() in progress */ |
c65c9bc3 | 309 | #define TTY_LDISC_OPEN 11 /* Line discipline is open */ |
1da177e4 LT |
310 | #define TTY_PTY_LOCK 16 /* pty private */ |
311 | #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */ | |
312 | #define TTY_HUPPED 18 /* Post driver->hangup() */ | |
acfa747b | 313 | #define TTY_HUPPING 21 /* ->hangup() in progress */ |
21622939 | 314 | #define TTY_LDISC_HALTED 22 /* Line discipline is halted */ |
1da177e4 LT |
315 | |
316 | #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) | |
317 | ||
70bc1264 PH |
318 | /* Values for tty->flow_change */ |
319 | #define TTY_THROTTLE_SAFE 1 | |
320 | #define TTY_UNTHROTTLE_SAFE 2 | |
321 | ||
322 | static inline void __tty_set_flow_change(struct tty_struct *tty, int val) | |
323 | { | |
324 | tty->flow_change = val; | |
325 | } | |
326 | ||
327 | static inline void tty_set_flow_change(struct tty_struct *tty, int val) | |
328 | { | |
329 | tty->flow_change = val; | |
330 | smp_mb(); | |
331 | } | |
332 | ||
4f73bc4d JM |
333 | #ifdef CONFIG_TTY |
334 | extern void console_init(void); | |
335 | extern void tty_kref_put(struct tty_struct *tty); | |
336 | extern struct pid *tty_get_pgrp(struct tty_struct *tty); | |
337 | extern void tty_vhangup_self(void); | |
338 | extern void disassociate_ctty(int priv); | |
339 | extern dev_t tty_devnum(struct tty_struct *tty); | |
340 | extern void proc_clear_tty(struct task_struct *p); | |
341 | extern struct tty_struct *get_current_tty(void); | |
342 | /* tty_io.c */ | |
343 | extern int __init tty_init(void); | |
344 | #else | |
345 | static inline void console_init(void) | |
346 | { } | |
347 | static inline void tty_kref_put(struct tty_struct *tty) | |
348 | { } | |
349 | static inline struct pid *tty_get_pgrp(struct tty_struct *tty) | |
350 | { return NULL; } | |
351 | static inline void tty_vhangup_self(void) | |
352 | { } | |
353 | static inline void disassociate_ctty(int priv) | |
354 | { } | |
355 | static inline dev_t tty_devnum(struct tty_struct *tty) | |
356 | { return 0; } | |
357 | static inline void proc_clear_tty(struct task_struct *p) | |
358 | { } | |
359 | static inline struct tty_struct *get_current_tty(void) | |
360 | { return NULL; } | |
361 | /* tty_io.c */ | |
362 | static inline int __init tty_init(void) | |
363 | { return 0; } | |
364 | #endif | |
365 | ||
1da177e4 LT |
366 | extern void tty_write_flush(struct tty_struct *); |
367 | ||
edc6afc5 | 368 | extern struct ktermios tty_std_termios; |
1da177e4 | 369 | |
1da177e4 LT |
370 | extern int vcs_init(void); |
371 | ||
d81ed103 AC |
372 | extern struct class *tty_class; |
373 | ||
9c9f4ded AC |
374 | /** |
375 | * tty_kref_get - get a tty reference | |
376 | * @tty: tty device | |
377 | * | |
378 | * Return a new reference to a tty object. The caller must hold | |
379 | * sufficient locks/counts to ensure that their existing reference cannot | |
380 | * go away | |
381 | */ | |
382 | ||
14bfc987 | 383 | static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) |
9c9f4ded AC |
384 | { |
385 | if (tty) | |
386 | kref_get(&tty->kref); | |
387 | return tty; | |
388 | } | |
9c9f4ded | 389 | |
1da177e4 LT |
390 | extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode, |
391 | const char *routine); | |
392 | extern char *tty_name(struct tty_struct *tty, char *buf); | |
7a4d29f4 AC |
393 | extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
394 | extern int tty_check_change(struct tty_struct *tty); | |
395 | extern void stop_tty(struct tty_struct *tty); | |
396 | extern void start_tty(struct tty_struct *tty); | |
1da177e4 LT |
397 | extern int tty_register_driver(struct tty_driver *driver); |
398 | extern int tty_unregister_driver(struct tty_driver *driver); | |
01107d34 GKH |
399 | extern struct device *tty_register_device(struct tty_driver *driver, |
400 | unsigned index, struct device *dev); | |
6915c0e4 TH |
401 | extern struct device *tty_register_device_attr(struct tty_driver *driver, |
402 | unsigned index, struct device *device, | |
403 | void *drvdata, | |
404 | const struct attribute_group **attr_grp); | |
1da177e4 LT |
405 | extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
406 | extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, | |
407 | int buflen); | |
408 | extern void tty_write_message(struct tty_struct *tty, char *msg); | |
f34d7a5b AC |
409 | extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
410 | extern int tty_chars_in_buffer(struct tty_struct *tty); | |
411 | extern int tty_write_room(struct tty_struct *tty); | |
412 | extern void tty_driver_flush_buffer(struct tty_struct *tty); | |
39c2e60f AC |
413 | extern void tty_throttle(struct tty_struct *tty); |
414 | extern void tty_unthrottle(struct tty_struct *tty); | |
70bc1264 PH |
415 | extern int tty_throttle_safe(struct tty_struct *tty); |
416 | extern int tty_unthrottle_safe(struct tty_struct *tty); | |
fc6f6238 | 417 | extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
24d406a6 JS |
418 | extern void tty_driver_remove_tty(struct tty_driver *driver, |
419 | struct tty_struct *tty); | |
feebed65 | 420 | extern void tty_free_termios(struct tty_struct *tty); |
3e7cd6c4 | 421 | extern int is_current_pgrp_orphaned(void); |
1da177e4 LT |
422 | extern int is_ignored(int sig); |
423 | extern int tty_signal(int sig, struct tty_struct *tty); | |
7a4d29f4 AC |
424 | extern void tty_hangup(struct tty_struct *tty); |
425 | extern void tty_vhangup(struct tty_struct *tty); | |
ddcd9fb6 | 426 | extern void tty_vhangup_locked(struct tty_struct *tty); |
1da177e4 | 427 | extern void tty_unhangup(struct file *filp); |
7a4d29f4 | 428 | extern int tty_hung_up_p(struct file *filp); |
1da177e4 | 429 | extern void do_SAK(struct tty_struct *tty); |
8b6312f4 | 430 | extern void __do_SAK(struct tty_struct *tty); |
98a27ba4 | 431 | extern void no_tty(void); |
e043e42b | 432 | extern void tty_flush_to_ldisc(struct tty_struct *tty); |
ecbbfd44 | 433 | extern void tty_buffer_free_all(struct tty_port *port); |
e0495736 | 434 | extern void tty_buffer_flush(struct tty_struct *tty); |
ecbbfd44 | 435 | extern void tty_buffer_init(struct tty_port *port); |
edc6afc5 AC |
436 | extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
437 | extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); | |
7a4d29f4 AC |
438 | extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
439 | speed_t ibaud, speed_t obaud); | |
440 | extern void tty_encode_baud_rate(struct tty_struct *tty, | |
441 | speed_t ibaud, speed_t obaud); | |
6865ff22 JS |
442 | |
443 | /** | |
444 | * tty_get_baud_rate - get tty bit rates | |
445 | * @tty: tty to query | |
446 | * | |
447 | * Returns the baud rate as an integer for this terminal. The | |
448 | * termios lock must be held by the caller and the terminal bit | |
449 | * flags may be updated. | |
450 | * | |
451 | * Locking: none | |
452 | */ | |
453 | static inline speed_t tty_get_baud_rate(struct tty_struct *tty) | |
454 | { | |
455 | return tty_termios_baud_rate(&tty->termios); | |
456 | } | |
457 | ||
5f519d72 | 458 | extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
bf5e5834 | 459 | extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b); |
8d075b19 | 460 | extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
1da177e4 LT |
461 | |
462 | extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); | |
463 | extern void tty_ldisc_deref(struct tty_ldisc *); | |
464 | extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); | |
c65c9bc3 | 465 | extern void tty_ldisc_hangup(struct tty_struct *tty); |
a352def2 | 466 | extern const struct file_operations tty_ldiscs_proc_fops; |
1da177e4 LT |
467 | |
468 | extern void tty_wakeup(struct tty_struct *tty); | |
469 | extern void tty_ldisc_flush(struct tty_struct *tty); | |
470 | ||
04f378b1 | 471 | extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
0fc00e24 AC |
472 | extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
473 | unsigned int cmd, unsigned long arg); | |
474 | extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); | |
d81ed103 | 475 | extern void tty_default_fops(struct file_operations *fops); |
bf970ee4 | 476 | extern struct tty_struct *alloc_tty_struct(void); |
fa90e1c9 JS |
477 | extern int tty_alloc_file(struct file *file); |
478 | extern void tty_add_file(struct tty_struct *tty, struct file *file); | |
479 | extern void tty_free_file(struct file *file); | |
bf970ee4 AC |
480 | extern void free_tty_struct(struct tty_struct *tty); |
481 | extern void initialize_tty_struct(struct tty_struct *tty, | |
482 | struct tty_driver *driver, int idx); | |
6716671d | 483 | extern void deinitialize_tty_struct(struct tty_struct *tty); |
593a27c4 | 484 | extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); |
eeb89d91 | 485 | extern int tty_release(struct inode *inode, struct file *filp); |
bf970ee4 | 486 | extern int tty_init_termios(struct tty_struct *tty); |
66d450e8 JS |
487 | extern int tty_standard_install(struct tty_driver *driver, |
488 | struct tty_struct *tty); | |
24ec839c | 489 | |
e8b70e7d AC |
490 | extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); |
491 | extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty); | |
492 | ||
70522e12 | 493 | extern struct mutex tty_mutex; |
ee2ffa0d | 494 | extern spinlock_t tty_files_lock; |
1da177e4 | 495 | |
9c1729db AC |
496 | extern void tty_write_unlock(struct tty_struct *tty); |
497 | extern int tty_write_lock(struct tty_struct *tty, int ndelay); | |
498 | #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) | |
499 | ||
6f67048c | 500 | extern void tty_port_init(struct tty_port *port); |
2cb4ca02 JS |
501 | extern void tty_port_link_device(struct tty_port *port, |
502 | struct tty_driver *driver, unsigned index); | |
057eb856 JS |
503 | extern struct device *tty_port_register_device(struct tty_port *port, |
504 | struct tty_driver *driver, unsigned index, | |
505 | struct device *device); | |
b1b79916 TH |
506 | extern struct device *tty_port_register_device_attr(struct tty_port *port, |
507 | struct tty_driver *driver, unsigned index, | |
508 | struct device *device, void *drvdata, | |
509 | const struct attribute_group **attr_grp); | |
6f67048c AC |
510 | extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
511 | extern void tty_port_free_xmit_buf(struct tty_port *port); | |
de274bfe | 512 | extern void tty_port_destroy(struct tty_port *port); |
568aafc6 AC |
513 | extern void tty_port_put(struct tty_port *port); |
514 | ||
2427b8e3 | 515 | static inline struct tty_port *tty_port_get(struct tty_port *port) |
568aafc6 AC |
516 | { |
517 | if (port) | |
518 | kref_get(&port->kref); | |
519 | return port; | |
520 | } | |
521 | ||
f21ec3d2 HS |
522 | /* If the cts flow control is enabled, return true. */ |
523 | static inline bool tty_port_cts_enabled(struct tty_port *port) | |
524 | { | |
525 | return port->flags & ASYNC_CTS_FLOW; | |
526 | } | |
527 | ||
4a90f09b AC |
528 | extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
529 | extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); | |
31f35939 | 530 | extern int tty_port_carrier_raised(struct tty_port *port); |
5d951fb4 | 531 | extern void tty_port_raise_dtr_rts(struct tty_port *port); |
fcc8ac18 | 532 | extern void tty_port_lower_dtr_rts(struct tty_port *port); |
3e61696b | 533 | extern void tty_port_hangup(struct tty_port *port); |
aa27a094 | 534 | extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); |
6aad04f2 | 535 | extern void tty_port_tty_wakeup(struct tty_port *port); |
36c621d8 AC |
536 | extern int tty_port_block_til_ready(struct tty_port *port, |
537 | struct tty_struct *tty, struct file *filp); | |
a6614999 AC |
538 | extern int tty_port_close_start(struct tty_port *port, |
539 | struct tty_struct *tty, struct file *filp); | |
540 | extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); | |
7ca0ff9a AC |
541 | extern void tty_port_close(struct tty_port *port, |
542 | struct tty_struct *tty, struct file *filp); | |
695586ca JS |
543 | extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
544 | struct tty_struct *tty); | |
64bc3979 AC |
545 | extern int tty_port_open(struct tty_port *port, |
546 | struct tty_struct *tty, struct file *filp); | |
2427b8e3 | 547 | static inline int tty_port_users(struct tty_port *port) |
b58d13a0 AC |
548 | { |
549 | return port->count + port->blocked_open; | |
550 | } | |
551 | ||
01e1abb2 AC |
552 | extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
553 | extern int tty_unregister_ldisc(int disc); | |
554 | extern int tty_set_ldisc(struct tty_struct *tty, int ldisc); | |
555 | extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); | |
556 | extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty); | |
557 | extern void tty_ldisc_init(struct tty_struct *tty); | |
6716671d | 558 | extern void tty_ldisc_deinit(struct tty_struct *tty); |
01e1abb2 | 559 | extern void tty_ldisc_begin(void); |
9c1729db | 560 | |
24a89d1c PH |
561 | static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p, |
562 | char *f, int count) | |
563 | { | |
564 | if (ld->ops->receive_buf2) | |
565 | count = ld->ops->receive_buf2(ld->tty, p, f, count); | |
566 | else { | |
567 | count = min_t(int, count, ld->tty->receive_room); | |
568 | if (count) | |
569 | ld->ops->receive_buf(ld->tty, p, f, count); | |
570 | } | |
571 | return count; | |
572 | } | |
573 | ||
9c1729db | 574 | |
1da177e4 | 575 | /* n_tty.c */ |
a352def2 | 576 | extern struct tty_ldisc_ops tty_ldisc_N_TTY; |
572b9adb | 577 | extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
1da177e4 | 578 | |
522ed776 MT |
579 | /* tty_audit.c */ |
580 | #ifdef CONFIG_AUDIT | |
581 | extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data, | |
6c633f27 | 582 | size_t size, unsigned icanon); |
522ed776 MT |
583 | extern void tty_audit_exit(void); |
584 | extern void tty_audit_fork(struct signal_struct *sig); | |
1e641743 | 585 | extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
522ed776 | 586 | extern void tty_audit_push(struct tty_struct *tty); |
152f497b | 587 | extern int tty_audit_push_current(void); |
522ed776 MT |
588 | #else |
589 | static inline void tty_audit_add_data(struct tty_struct *tty, | |
6c633f27 | 590 | unsigned char *data, size_t size, unsigned icanon) |
522ed776 MT |
591 | { |
592 | } | |
1e641743 AV |
593 | static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
594 | { | |
595 | } | |
522ed776 MT |
596 | static inline void tty_audit_exit(void) |
597 | { | |
598 | } | |
599 | static inline void tty_audit_fork(struct signal_struct *sig) | |
600 | { | |
601 | } | |
602 | static inline void tty_audit_push(struct tty_struct *tty) | |
603 | { | |
604 | } | |
152f497b | 605 | static inline int tty_audit_push_current(void) |
522ed776 | 606 | { |
3c80fe4a | 607 | return 0; |
522ed776 | 608 | } |
522ed776 MT |
609 | #endif |
610 | ||
1da177e4 | 611 | /* tty_ioctl.c */ |
47afa7a5 | 612 | extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
1da177e4 | 613 | unsigned int cmd, unsigned long arg); |
8193c429 TM |
614 | extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, |
615 | unsigned int cmd, unsigned long arg); | |
1da177e4 LT |
616 | |
617 | /* serial.c */ | |
618 | ||
619 | extern void serial_console_init(void); | |
7a4d29f4 | 620 | |
1da177e4 LT |
621 | /* pcxx.c */ |
622 | ||
623 | extern int pcxe_open(struct tty_struct *tty, struct file *filp); | |
624 | ||
1da177e4 LT |
625 | /* vt.c */ |
626 | ||
6caa76b7 | 627 | extern int vt_ioctl(struct tty_struct *tty, |
1da177e4 LT |
628 | unsigned int cmd, unsigned long arg); |
629 | ||
94c2273d | 630 | extern long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
631 | unsigned int cmd, unsigned long arg); |
632 | ||
b07471fa | 633 | /* tty_mutex.c */ |
ec79d605 | 634 | /* functions for preparation of BKL removal */ |
89c8d91e AC |
635 | extern void __lockfunc tty_lock(struct tty_struct *tty); |
636 | extern void __lockfunc tty_unlock(struct tty_struct *tty); | |
637 | extern void __lockfunc tty_lock_pair(struct tty_struct *tty, | |
638 | struct tty_struct *tty2); | |
639 | extern void __lockfunc tty_unlock_pair(struct tty_struct *tty, | |
640 | struct tty_struct *tty2); | |
ec79d605 | 641 | |
a57a7bf3 JS |
642 | /* |
643 | * this shall be called only from where BTM is held (like close) | |
644 | * | |
645 | * We need this to ensure nobody waits for us to finish while we are waiting. | |
646 | * Without this we were encountering system stalls. | |
647 | * | |
648 | * This should be indeed removed with BTM removal later. | |
649 | * | |
650 | * Locking: BTM required. Nobody is allowed to hold port->mutex. | |
651 | */ | |
652 | static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, | |
653 | long timeout) | |
654 | { | |
89c8d91e | 655 | tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */ |
a57a7bf3 | 656 | tty_wait_until_sent(tty, timeout); |
89c8d91e | 657 | tty_lock(tty); |
a57a7bf3 | 658 | } |
ec79d605 | 659 | |
be1bc288 AB |
660 | /* |
661 | * wait_event_interruptible_tty -- wait for a condition with the tty lock held | |
662 | * | |
663 | * The condition we are waiting for might take a long time to | |
664 | * become true, or might depend on another thread taking the | |
665 | * BTM. In either case, we need to drop the BTM to guarantee | |
666 | * forward progress. This is a leftover from the conversion | |
667 | * from the BKL and should eventually get removed as the BTM | |
668 | * falls out of use. | |
669 | * | |
670 | * Do not use in new code. | |
671 | */ | |
89c8d91e | 672 | #define wait_event_interruptible_tty(tty, wq, condition) \ |
be1bc288 AB |
673 | ({ \ |
674 | int __ret = 0; \ | |
675 | if (!(condition)) { \ | |
89c8d91e | 676 | __wait_event_interruptible_tty(tty, wq, condition, __ret); \ |
be1bc288 AB |
677 | } \ |
678 | __ret; \ | |
679 | }) | |
680 | ||
89c8d91e | 681 | #define __wait_event_interruptible_tty(tty, wq, condition, ret) \ |
be1bc288 AB |
682 | do { \ |
683 | DEFINE_WAIT(__wait); \ | |
684 | \ | |
685 | for (;;) { \ | |
686 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ | |
687 | if (condition) \ | |
688 | break; \ | |
689 | if (!signal_pending(current)) { \ | |
89c8d91e | 690 | tty_unlock(tty); \ |
be1bc288 | 691 | schedule(); \ |
89c8d91e | 692 | tty_lock(tty); \ |
be1bc288 AB |
693 | continue; \ |
694 | } \ | |
695 | ret = -ERESTARTSYS; \ | |
696 | break; \ | |
697 | } \ | |
698 | finish_wait(&wq, &__wait); \ | |
699 | } while (0) | |
700 | ||
34db8aaf DH |
701 | #ifdef CONFIG_PROC_FS |
702 | extern void proc_tty_register_driver(struct tty_driver *); | |
703 | extern void proc_tty_unregister_driver(struct tty_driver *); | |
704 | #else | |
705 | static inline void proc_tty_register_driver(struct tty_driver *d) {} | |
706 | static inline void proc_tty_unregister_driver(struct tty_driver *d) {} | |
707 | #endif | |
be1bc288 | 708 | |
1da177e4 | 709 | #endif |