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