1 #ifndef _LINUX_TTY_H
2 #define _LINUX_TTY_H
3
4 /*
5 * 'tty.h' defines some structures used by tty_io.c and some defines.
6 */
7
8 #ifdef __KERNEL__
9 #include <linux/fs.h>
10 #include <linux/major.h>
11 #include <linux/termios.h>
12 #include <linux/workqueue.h>
13 #include <linux/tty_driver.h>
14 #include <linux/tty_ldisc.h>
15 #include <linux/mutex.h>
16
17 #include <asm/system.h>
18
19
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 */
25 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
26 #define NR_LDISCS 30
27
28 /* line disciplines */
29 #define N_TTY 0
30 #define N_SLIP 1
31 #define N_MOUSE 2
32 #define N_PPP 3
33 #define N_STRIP 4
34 #define N_AX25 5
35 #define N_X25 6 /* X.25 async */
36 #define N_6PACK 7
37 #define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
38 #define N_R3964 9 /* Reserved for Simatic R3964 module */
39 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
40 #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
41 #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
42 /* cards about SMS messages */
43 #define N_HDLC 13 /* synchronous HDLC */
44 #define N_SYNC_PPP 14 /* synchronous PPP */
45 #define N_HCI 15 /* Bluetooth HCI UART */
46 #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
47 #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
48 #define N_PPS 18 /* Pulse per Second */
49 #define N_V253 19 /* Codec control over voice modem */
50 #define N_CAIF 20 /* CAIF protocol for talking to modems */
51 #define N_GSM0710 21 /* GSM 0710 Mux */
52 #define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
53
54 /*
55 * This character is the same as _POSIX_VDISABLE: it cannot be used as
56 * a c_cc[] character, but indicates that a particular special character
57 * isn't in use (eg VINTR has no character etc)
58 */
59 #define __DISABLED_CHAR '\0'
60
61 struct tty_buffer {
62 struct tty_buffer *next;
63 char *char_buf_ptr;
64 unsigned char *flag_buf_ptr;
65 int used;
66 int size;
67 int commit;
68 int read;
69 /* Data points here */
70 unsigned long data[0];
71 };
72
73 /*
74 * We default to dicing tty buffer allocations to this many characters
75 * in order to avoid multiple page allocations. We know the size of
76 * tty_buffer itself but it must also be taken into account that the
77 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
78 * logic this must match
79 */
80
81 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
82
83
84 struct tty_bufhead {
85 struct work_struct work;
86 spinlock_t lock;
87 struct tty_buffer *head; /* Queue head */
88 struct tty_buffer *tail; /* Active buffer */
89 struct tty_buffer *free; /* Free queue head */
90 int memory_used; /* Buffer space used excluding
91 free queue */
92 };
93 /*
94 * When a break, frame error, or parity error happens, these codes are
95 * stuffed into the flags buffer.
96 */
97 #define TTY_NORMAL 0
98 #define TTY_BREAK 1
99 #define TTY_FRAME 2
100 #define TTY_PARITY 3
101 #define TTY_OVERRUN 4
102
103 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
104 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
105 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
106 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
107 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
108 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
109 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
110 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
111 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
112 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
113 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
114 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
115 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
116 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
117 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
118 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
119 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
120
121 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
122 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
123 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
124 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
125
126 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
127 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
128 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
129 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
130 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
131 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
132 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
133 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
134 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
135 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
136 #define I_IXON(tty) _I_FLAG((tty), IXON)
137 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
138 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
139 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
140 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
141
142 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
143 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
144 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
145 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
146 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
147 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
148 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
149 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
150 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
151 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
152 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
153 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
154 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
155 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
156
157 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
158 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
159 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
160 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
161 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
162 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
163 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
164 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
165 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
166 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
167
168 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
169 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
170 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
171 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
172 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
173 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
174 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
175 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
176 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
177 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
178 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
179 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
180 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
181 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
182 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
183 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
184
185 struct device;
186 struct signal_struct;
187
188 /*
189 * Port level information. Each device keeps its own port level information
190 * so provide a common structure for those ports wanting to use common support
191 * routines.
192 *
193 * The tty port has a different lifetime to the tty so must be kept apart.
194 * In addition be careful as tty -> port mappings are valid for the life
195 * of the tty object but in many cases port -> tty mappings are valid only
196 * until a hangup so don't use the wrong path.
197 */
198
199 struct tty_port;
200
201 struct tty_port_operations {
202 /* Return 1 if the carrier is raised */
203 int (*carrier_raised)(struct tty_port *port);
204 /* Control the DTR line */
205 void (*dtr_rts)(struct tty_port *port, int raise);
206 /* Called when the last close completes or a hangup finishes
207 IFF the port was initialized. Do not use to free resources. Called
208 under the port mutex to serialize against activate/shutdowns */
209 void (*shutdown)(struct tty_port *port);
210 void (*drop)(struct tty_port *port);
211 /* Called under the port mutex from tty_port_open, serialized using
212 the port mutex */
213 /* FIXME: long term getting the tty argument *out* of this would be
214 good for consoles */
215 int (*activate)(struct tty_port *port, struct tty_struct *tty);
216 /* Called on the final put of a port */
217 void (*destruct)(struct tty_port *port);
218 };
219
220 struct tty_port {
221 struct tty_struct *tty; /* Back pointer */
222 const struct tty_port_operations *ops; /* Port operations */
223 spinlock_t lock; /* Lock protecting tty field */
224 int blocked_open; /* Waiting to open */
225 int count; /* Usage count */
226 wait_queue_head_t open_wait; /* Open waiters */
227 wait_queue_head_t close_wait; /* Close waiters */
228 wait_queue_head_t delta_msr_wait; /* Modem status change */
229 unsigned long flags; /* TTY flags ASY_*/
230 unsigned char console:1; /* port is a console */
231 struct mutex mutex; /* Locking */
232 struct mutex buf_mutex; /* Buffer alloc lock */
233 unsigned char *xmit_buf; /* Optional buffer */
234 unsigned int close_delay; /* Close port delay */
235 unsigned int closing_wait; /* Delay for output */
236 int drain_delay; /* Set to zero if no pure time
237 based drain is needed else
238 set to size of fifo */
239 struct kref kref; /* Ref counter */
240 };
241
242 /*
243 * Where all of the state associated with a tty is kept while the tty
244 * is open. Since the termios state should be kept even if the tty
245 * has been closed --- for things like the baud rate, etc --- it is
246 * not stored here, but rather a pointer to the real state is stored
247 * here. Possible the winsize structure should have the same
248 * treatment, but (1) the default 80x24 is usually right and (2) it's
249 * most often used by a windowing system, which will set the correct
250 * size each time the window is created or resized anyway.
251 * - TYT, 9/14/92
252 */
253
254 struct tty_operations;
255
256 struct tty_struct {
257 int magic;
258 struct kref kref;
259 struct device *dev;
260 struct tty_driver *driver;
261 const struct tty_operations *ops;
262 int index;
263
264 /* Protects ldisc changes: Lock tty not pty */
265 struct mutex ldisc_mutex;
266 struct tty_ldisc *ldisc;
267
268 struct mutex termios_mutex;
269 spinlock_t ctrl_lock;
270 /* Termios values are protected by the termios mutex */
271 struct ktermios *termios, *termios_locked;
272 struct termiox *termiox; /* May be NULL for unsupported */
273 char name[64];
274 struct pid *pgrp; /* Protected by ctrl lock */
275 struct pid *session;
276 unsigned long flags;
277 int count;
278 struct winsize winsize; /* termios mutex */
279 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
280 unsigned char low_latency:1, warned:1;
281 unsigned char ctrl_status; /* ctrl_lock */
282 unsigned int receive_room; /* Bytes free for queue */
283
284 struct tty_struct *link;
285 struct fasync_struct *fasync;
286 struct tty_bufhead buf; /* Locked internally */
287 int alt_speed; /* For magic substitution of 38400 bps */
288 wait_queue_head_t write_wait;
289 wait_queue_head_t read_wait;
290 struct work_struct hangup_work;
291 void *disc_data;
292 void *driver_data;
293 struct list_head tty_files;
294
295 #define N_TTY_BUF_SIZE 4096
296
297 /*
298 * The following is data for the N_TTY line discipline. For
299 * historical reasons, this is included in the tty structure.
300 * Mostly locked by the BKL.
301 */
302 unsigned int column;
303 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
304 unsigned char closing:1;
305 unsigned char echo_overrun:1;
306 unsigned short minimum_to_wake;
307 unsigned long overrun_time;
308 int num_overrun;
309 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
310 char *read_buf;
311 int read_head;
312 int read_tail;
313 int read_cnt;
314 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
315 unsigned char *echo_buf;
316 unsigned int echo_pos;
317 unsigned int echo_cnt;
318 int canon_data;
319 unsigned long canon_head;
320 unsigned int canon_column;
321 struct mutex atomic_read_lock;
322 struct mutex atomic_write_lock;
323 struct mutex output_lock;
324 struct mutex echo_lock;
325 unsigned char *write_buf;
326 int write_cnt;
327 spinlock_t read_lock;
328 /* If the tty has a pending do_SAK, queue it here - akpm */
329 struct work_struct SAK_work;
330 struct tty_port *port;
331 };
332
333 /* Each of a tty's open files has private_data pointing to tty_file_private */
334 struct tty_file_private {
335 struct tty_struct *tty;
336 struct file *file;
337 struct list_head list;
338 };
339
340 /* tty magic number */
341 #define TTY_MAGIC 0x5401
342
343 /*
344 * These bits are used in the flags field of the tty structure.
345 *
346 * So that interrupts won't be able to mess up the queues,
347 * copy_to_cooked must be atomic with respect to itself, as must
348 * tty->write. Thus, you must use the inline functions set_bit() and
349 * clear_bit() to make things atomic.
350 */
351 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
352 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
353 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
354 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
355 #define TTY_DEBUG 4 /* Debugging */
356 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
357 #define TTY_PUSH 6 /* n_tty private */
358 #define TTY_CLOSING 7 /* ->close() in progress */
359 #define TTY_LDISC 9 /* Line discipline attached */
360 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
361 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
362 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
363 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
364 #define TTY_PTY_LOCK 16 /* pty private */
365 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
366 #define TTY_HUPPED 18 /* Post driver->hangup() */
367 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
368 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
369 #define TTY_HUPPING 21 /* ->hangup() in progress */
370
371 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
372
373 extern void tty_write_flush(struct tty_struct *);
374
375 extern struct ktermios tty_std_termios;
376
377 extern void console_init(void);
378 extern int vcs_init(void);
379
380 extern struct class *tty_class;
381
382 /**
383 * tty_kref_get - get a tty reference
384 * @tty: tty device
385 *
386 * Return a new reference to a tty object. The caller must hold
387 * sufficient locks/counts to ensure that their existing reference cannot
388 * go away
389 */
390
tty_kref_get(struct tty_struct * tty)391 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
392 {
393 if (tty)
394 kref_get(&tty->kref);
395 return tty;
396 }
397 extern void tty_kref_put(struct tty_struct *tty);
398
399 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
400 const char *routine);
401 extern char *tty_name(struct tty_struct *tty, char *buf);
402 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
403 extern int tty_check_change(struct tty_struct *tty);
404 extern void stop_tty(struct tty_struct *tty);
405 extern void start_tty(struct tty_struct *tty);
406 extern int tty_register_driver(struct tty_driver *driver);
407 extern int tty_unregister_driver(struct tty_driver *driver);
408 extern struct device *tty_register_device(struct tty_driver *driver,
409 unsigned index, struct device *dev);
410 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
411 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
412 int buflen);
413 extern void tty_write_message(struct tty_struct *tty, char *msg);
414 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
415 extern int tty_chars_in_buffer(struct tty_struct *tty);
416 extern int tty_write_room(struct tty_struct *tty);
417 extern void tty_driver_flush_buffer(struct tty_struct *tty);
418 extern void tty_throttle(struct tty_struct *tty);
419 extern void tty_unthrottle(struct tty_struct *tty);
420 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
421 extern void tty_shutdown(struct tty_struct *tty);
422 extern void tty_free_termios(struct tty_struct *tty);
423 extern int is_current_pgrp_orphaned(void);
424 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
425 extern int is_ignored(int sig);
426 extern int tty_signal(int sig, struct tty_struct *tty);
427 extern void tty_hangup(struct tty_struct *tty);
428 extern void tty_vhangup(struct tty_struct *tty);
429 extern void tty_vhangup_locked(struct tty_struct *tty);
430 extern void tty_vhangup_self(void);
431 extern void tty_unhangup(struct file *filp);
432 extern int tty_hung_up_p(struct file *filp);
433 extern void do_SAK(struct tty_struct *tty);
434 extern void __do_SAK(struct tty_struct *tty);
435 extern void disassociate_ctty(int priv);
436 extern void no_tty(void);
437 extern void tty_flip_buffer_push(struct tty_struct *tty);
438 extern void tty_flush_to_ldisc(struct tty_struct *tty);
439 extern void tty_buffer_free_all(struct tty_struct *tty);
440 extern void tty_buffer_flush(struct tty_struct *tty);
441 extern void tty_buffer_init(struct tty_struct *tty);
442 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
443 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
444 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
445 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
446 speed_t ibaud, speed_t obaud);
447 extern void tty_encode_baud_rate(struct tty_struct *tty,
448 speed_t ibaud, speed_t obaud);
449 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
450 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
451 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
452
453 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
454 extern void tty_ldisc_deref(struct tty_ldisc *);
455 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
456 extern void tty_ldisc_hangup(struct tty_struct *tty);
457 extern const struct file_operations tty_ldiscs_proc_fops;
458
459 extern void tty_wakeup(struct tty_struct *tty);
460 extern void tty_ldisc_flush(struct tty_struct *tty);
461
462 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
463 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
464 unsigned int cmd, unsigned long arg);
465 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
466 extern dev_t tty_devnum(struct tty_struct *tty);
467 extern void proc_clear_tty(struct task_struct *p);
468 extern struct tty_struct *get_current_tty(void);
469 extern void tty_default_fops(struct file_operations *fops);
470 extern struct tty_struct *alloc_tty_struct(void);
471 extern int tty_add_file(struct tty_struct *tty, struct file *file);
472 extern void free_tty_struct(struct tty_struct *tty);
473 extern void initialize_tty_struct(struct tty_struct *tty,
474 struct tty_driver *driver, int idx);
475 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
476 int first_ok);
477 extern int tty_release(struct inode *inode, struct file *filp);
478 extern int tty_init_termios(struct tty_struct *tty);
479
480 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
481 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
482
483 extern struct mutex tty_mutex;
484 extern spinlock_t tty_files_lock;
485
486 extern void tty_write_unlock(struct tty_struct *tty);
487 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
488 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
489
490 extern void tty_port_init(struct tty_port *port);
491 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
492 extern void tty_port_free_xmit_buf(struct tty_port *port);
493 extern void tty_port_put(struct tty_port *port);
494
tty_port_get(struct tty_port * port)495 static inline struct tty_port *tty_port_get(struct tty_port *port)
496 {
497 if (port)
498 kref_get(&port->kref);
499 return port;
500 }
501
502 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
503 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
504 extern int tty_port_carrier_raised(struct tty_port *port);
505 extern void tty_port_raise_dtr_rts(struct tty_port *port);
506 extern void tty_port_lower_dtr_rts(struct tty_port *port);
507 extern void tty_port_hangup(struct tty_port *port);
508 extern int tty_port_block_til_ready(struct tty_port *port,
509 struct tty_struct *tty, struct file *filp);
510 extern int tty_port_close_start(struct tty_port *port,
511 struct tty_struct *tty, struct file *filp);
512 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
513 extern void tty_port_close(struct tty_port *port,
514 struct tty_struct *tty, struct file *filp);
515 extern int tty_port_open(struct tty_port *port,
516 struct tty_struct *tty, struct file *filp);
tty_port_users(struct tty_port * port)517 static inline int tty_port_users(struct tty_port *port)
518 {
519 return port->count + port->blocked_open;
520 }
521
522 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
523 extern int tty_unregister_ldisc(int disc);
524 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
525 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
526 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
527 extern void tty_ldisc_init(struct tty_struct *tty);
528 extern void tty_ldisc_begin(void);
529 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
530 extern void tty_ldisc_enable(struct tty_struct *tty);
531
532
533 /* n_tty.c */
534 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
535 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
536
537 /* tty_audit.c */
538 #ifdef CONFIG_AUDIT
539 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
540 size_t size);
541 extern void tty_audit_exit(void);
542 extern void tty_audit_fork(struct signal_struct *sig);
543 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
544 extern void tty_audit_push(struct tty_struct *tty);
545 extern int tty_audit_push_task(struct task_struct *tsk,
546 uid_t loginuid, u32 sessionid);
547 #else
tty_audit_add_data(struct tty_struct * tty,unsigned char * data,size_t size)548 static inline void tty_audit_add_data(struct tty_struct *tty,
549 unsigned char *data, size_t size)
550 {
551 }
tty_audit_tiocsti(struct tty_struct * tty,char ch)552 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
553 {
554 }
tty_audit_exit(void)555 static inline void tty_audit_exit(void)
556 {
557 }
tty_audit_fork(struct signal_struct * sig)558 static inline void tty_audit_fork(struct signal_struct *sig)
559 {
560 }
tty_audit_push(struct tty_struct * tty)561 static inline void tty_audit_push(struct tty_struct *tty)
562 {
563 }
tty_audit_push_task(struct task_struct * tsk,uid_t loginuid,u32 sessionid)564 static inline int tty_audit_push_task(struct task_struct *tsk,
565 uid_t loginuid, u32 sessionid)
566 {
567 return 0;
568 }
569 #endif
570
571 /* tty_io.c */
572 extern int __init tty_init(void);
573
574 /* tty_ioctl.c */
575 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
576 unsigned int cmd, unsigned long arg);
577
578 /* serial.c */
579
580 extern void serial_console_init(void);
581
582 /* pcxx.c */
583
584 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
585
586 /* vt.c */
587
588 extern int vt_ioctl(struct tty_struct *tty,
589 unsigned int cmd, unsigned long arg);
590
591 extern long vt_compat_ioctl(struct tty_struct *tty,
592 unsigned int cmd, unsigned long arg);
593
594 /* tty_mutex.c */
595 /* functions for preparation of BKL removal */
596 extern void __lockfunc tty_lock(void) __acquires(tty_lock);
597 extern void __lockfunc tty_unlock(void) __releases(tty_lock);
598 extern struct task_struct *__big_tty_mutex_owner;
599 #define tty_locked() (current == __big_tty_mutex_owner)
600
601 /*
602 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
603 *
604 * The condition we are waiting for might take a long time to
605 * become true, or might depend on another thread taking the
606 * BTM. In either case, we need to drop the BTM to guarantee
607 * forward progress. This is a leftover from the conversion
608 * from the BKL and should eventually get removed as the BTM
609 * falls out of use.
610 *
611 * Do not use in new code.
612 */
613 #define wait_event_interruptible_tty(wq, condition) \
614 ({ \
615 int __ret = 0; \
616 if (!(condition)) { \
617 __wait_event_interruptible_tty(wq, condition, __ret); \
618 } \
619 __ret; \
620 })
621
622 #define __wait_event_interruptible_tty(wq, condition, ret) \
623 do { \
624 DEFINE_WAIT(__wait); \
625 \
626 for (;;) { \
627 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
628 if (condition) \
629 break; \
630 if (!signal_pending(current)) { \
631 tty_unlock(); \
632 schedule(); \
633 tty_lock(); \
634 continue; \
635 } \
636 ret = -ERESTARTSYS; \
637 break; \
638 } \
639 finish_wait(&wq, &__wait); \
640 } while (0)
641
642
643 #endif /* __KERNEL__ */
644 #endif
645