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 19
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
50 /*
51 * This character is the same as _POSIX_VDISABLE: it cannot be used as
52 * a c_cc[] character, but indicates that a particular special character
53 * isn't in use (eg VINTR has no character etc)
54 */
55 #define __DISABLED_CHAR '\0'
56
57 struct tty_buffer {
58 struct tty_buffer *next;
59 char *char_buf_ptr;
60 unsigned char *flag_buf_ptr;
61 int used;
62 int size;
63 int commit;
64 int read;
65 /* Data points here */
66 unsigned long data[0];
67 };
68
69 struct tty_bufhead {
70 struct delayed_work work;
71 spinlock_t lock;
72 struct tty_buffer *head; /* Queue head */
73 struct tty_buffer *tail; /* Active buffer */
74 struct tty_buffer *free; /* Free queue head */
75 int memory_used; /* Buffer space used excluding
76 free queue */
77 };
78 /*
79 * When a break, frame error, or parity error happens, these codes are
80 * stuffed into the flags buffer.
81 */
82 #define TTY_NORMAL 0
83 #define TTY_BREAK 1
84 #define TTY_FRAME 2
85 #define TTY_PARITY 3
86 #define TTY_OVERRUN 4
87
88 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
89 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
90 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
91 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
92 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
93 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
94 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
95 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
96 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
97 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
98 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
99 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
100 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
101 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
102 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
103 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
104 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
105
106 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
107 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
108 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
109 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
110
111 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
112 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
113 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
114 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
115 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
116 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
117 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
118 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
119 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
120 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
121 #define I_IXON(tty) _I_FLAG((tty), IXON)
122 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
123 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
124 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
125 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
126
127 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
128 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
129 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
130 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
131 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
132 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
133 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
134 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
135 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
136 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
137 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
138 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
139 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
140 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
141
142 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
143 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
144 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
145 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
146 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
147 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
148 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
149 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
150 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
151 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
152
153 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
154 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
155 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
156 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
157 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
158 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
159 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
160 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
161 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
162 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
163 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
164 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
165 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
166 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
167 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
168
169 struct device;
170 struct signal_struct;
171
172 /*
173 * Port level information. Each device keeps its own port level information
174 * so provide a common structure for those ports wanting to use common support
175 * routines.
176 *
177 * The tty port has a different lifetime to the tty so must be kept apart.
178 * In addition be careful as tty -> port mappings are valid for the life
179 * of the tty object but in many cases port -> tty mappings are valid only
180 * until a hangup so don't use the wrong path.
181 */
182
183 struct tty_port;
184
185 struct tty_port_operations {
186 /* Return 1 if the carrier is raised */
187 int (*carrier_raised)(struct tty_port *port);
188 /* Control the DTR line */
189 void (*dtr_rts)(struct tty_port *port, int raise);
190 /* Called when the last close completes or a hangup finishes
191 IFF the port was initialized. Do not use to free resources */
192 void (*shutdown)(struct tty_port *port);
193 void (*drop)(struct tty_port *port);
194 };
195
196 struct tty_port {
197 struct tty_struct *tty; /* Back pointer */
198 const struct tty_port_operations *ops; /* Port operations */
199 spinlock_t lock; /* Lock protecting tty field */
200 int blocked_open; /* Waiting to open */
201 int count; /* Usage count */
202 wait_queue_head_t open_wait; /* Open waiters */
203 wait_queue_head_t close_wait; /* Close waiters */
204 unsigned long flags; /* TTY flags ASY_*/
205 struct mutex mutex; /* Locking */
206 unsigned char *xmit_buf; /* Optional buffer */
207 int close_delay; /* Close port delay */
208 int closing_wait; /* Delay for output */
209 int drain_delay; /* Set to zero if no pure time
210 based drain is needed else
211 set to size of fifo */
212 };
213
214 /*
215 * Where all of the state associated with a tty is kept while the tty
216 * is open. Since the termios state should be kept even if the tty
217 * has been closed --- for things like the baud rate, etc --- it is
218 * not stored here, but rather a pointer to the real state is stored
219 * here. Possible the winsize structure should have the same
220 * treatment, but (1) the default 80x24 is usually right and (2) it's
221 * most often used by a windowing system, which will set the correct
222 * size each time the window is created or resized anyway.
223 * - TYT, 9/14/92
224 */
225
226 struct tty_operations;
227
228 struct tty_struct {
229 int magic;
230 struct kref kref;
231 struct tty_driver *driver;
232 const struct tty_operations *ops;
233 int index;
234
235 /* Protects ldisc changes: Lock tty not pty */
236 struct mutex ldisc_mutex;
237 struct tty_ldisc *ldisc;
238
239 struct mutex termios_mutex;
240 spinlock_t ctrl_lock;
241 /* Termios values are protected by the termios mutex */
242 struct ktermios *termios, *termios_locked;
243 struct termiox *termiox; /* May be NULL for unsupported */
244 char name[64];
245 struct pid *pgrp; /* Protected by ctrl lock */
246 struct pid *session;
247 unsigned long flags;
248 int count;
249 struct winsize winsize; /* termios mutex */
250 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
251 unsigned char low_latency:1, warned:1;
252 unsigned char ctrl_status; /* ctrl_lock */
253 unsigned int receive_room; /* Bytes free for queue */
254
255 struct tty_struct *link;
256 struct fasync_struct *fasync;
257 struct tty_bufhead buf; /* Locked internally */
258 int alt_speed; /* For magic substitution of 38400 bps */
259 wait_queue_head_t write_wait;
260 wait_queue_head_t read_wait;
261 struct work_struct hangup_work;
262 void *disc_data;
263 void *driver_data;
264 struct list_head tty_files;
265
266 #define N_TTY_BUF_SIZE 4096
267
268 /*
269 * The following is data for the N_TTY line discipline. For
270 * historical reasons, this is included in the tty structure.
271 * Mostly locked by the BKL.
272 */
273 unsigned int column;
274 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
275 unsigned char closing:1;
276 unsigned char echo_overrun:1;
277 unsigned short minimum_to_wake;
278 unsigned long overrun_time;
279 int num_overrun;
280 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
281 char *read_buf;
282 int read_head;
283 int read_tail;
284 int read_cnt;
285 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
286 unsigned char *echo_buf;
287 unsigned int echo_pos;
288 unsigned int echo_cnt;
289 int canon_data;
290 unsigned long canon_head;
291 unsigned int canon_column;
292 struct mutex atomic_read_lock;
293 struct mutex atomic_write_lock;
294 struct mutex output_lock;
295 struct mutex echo_lock;
296 unsigned char *write_buf;
297 int write_cnt;
298 spinlock_t read_lock;
299 /* If the tty has a pending do_SAK, queue it here - akpm */
300 struct work_struct SAK_work;
301 struct tty_port *port;
302 };
303
304 /* tty magic number */
305 #define TTY_MAGIC 0x5401
306
307 /*
308 * These bits are used in the flags field of the tty structure.
309 *
310 * So that interrupts won't be able to mess up the queues,
311 * copy_to_cooked must be atomic with respect to itself, as must
312 * tty->write. Thus, you must use the inline functions set_bit() and
313 * clear_bit() to make things atomic.
314 */
315 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
316 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
317 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
318 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
319 #define TTY_DEBUG 4 /* Debugging */
320 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
321 #define TTY_PUSH 6 /* n_tty private */
322 #define TTY_CLOSING 7 /* ->close() in progress */
323 #define TTY_LDISC 9 /* Line discipline attached */
324 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
325 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
326 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
327 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
328 #define TTY_PTY_LOCK 16 /* pty private */
329 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
330 #define TTY_HUPPED 18 /* Post driver->hangup() */
331 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
332 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
333
334 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
335
336 extern void tty_write_flush(struct tty_struct *);
337
338 extern struct ktermios tty_std_termios;
339
340 extern int kmsg_redirect;
341
342 extern void console_init(void);
343 extern int vcs_init(void);
344
345 extern struct class *tty_class;
346
347 /**
348 * tty_kref_get - get a tty reference
349 * @tty: tty device
350 *
351 * Return a new reference to a tty object. The caller must hold
352 * sufficient locks/counts to ensure that their existing reference cannot
353 * go away
354 */
355
356 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
357 {
358 if (tty)
359 kref_get(&tty->kref);
360 return tty;
361 }
362 extern void tty_kref_put(struct tty_struct *tty);
363
364 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
365 const char *routine);
366 extern char *tty_name(struct tty_struct *tty, char *buf);
367 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
368 extern int tty_check_change(struct tty_struct *tty);
369 extern void stop_tty(struct tty_struct *tty);
370 extern void start_tty(struct tty_struct *tty);
371 extern int tty_register_driver(struct tty_driver *driver);
372 extern int tty_unregister_driver(struct tty_driver *driver);
373 extern struct device *tty_register_device(struct tty_driver *driver,
374 unsigned index, struct device *dev);
375 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
376 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
377 int buflen);
378 extern void tty_write_message(struct tty_struct *tty, char *msg);
379 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
380 extern int tty_chars_in_buffer(struct tty_struct *tty);
381 extern int tty_write_room(struct tty_struct *tty);
382 extern void tty_driver_flush_buffer(struct tty_struct *tty);
383 extern void tty_throttle(struct tty_struct *tty);
384 extern void tty_unthrottle(struct tty_struct *tty);
385 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
386 extern void tty_shutdown(struct tty_struct *tty);
387 extern void tty_free_termios(struct tty_struct *tty);
388 extern int is_current_pgrp_orphaned(void);
389 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
390 extern int is_ignored(int sig);
391 extern int tty_signal(int sig, struct tty_struct *tty);
392 extern void tty_hangup(struct tty_struct *tty);
393 extern void tty_vhangup(struct tty_struct *tty);
394 extern void tty_vhangup_self(void);
395 extern void tty_unhangup(struct file *filp);
396 extern int tty_hung_up_p(struct file *filp);
397 extern void do_SAK(struct tty_struct *tty);
398 extern void __do_SAK(struct tty_struct *tty);
399 extern void disassociate_ctty(int priv);
400 extern void no_tty(void);
401 extern void tty_flip_buffer_push(struct tty_struct *tty);
402 extern void tty_flush_to_ldisc(struct tty_struct *tty);
403 extern void tty_buffer_free_all(struct tty_struct *tty);
404 extern void tty_buffer_flush(struct tty_struct *tty);
405 extern void tty_buffer_init(struct tty_struct *tty);
406 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
407 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
408 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
409 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
410 speed_t ibaud, speed_t obaud);
411 extern void tty_encode_baud_rate(struct tty_struct *tty,
412 speed_t ibaud, speed_t obaud);
413 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
414 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
415
416 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
417 extern void tty_ldisc_deref(struct tty_ldisc *);
418 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
419 extern void tty_ldisc_hangup(struct tty_struct *tty);
420 extern const struct file_operations tty_ldiscs_proc_fops;
421
422 extern void tty_wakeup(struct tty_struct *tty);
423 extern void tty_ldisc_flush(struct tty_struct *tty);
424
425 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
426 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
427 unsigned int cmd, unsigned long arg);
428 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
429 extern dev_t tty_devnum(struct tty_struct *tty);
430 extern void proc_clear_tty(struct task_struct *p);
431 extern struct tty_struct *get_current_tty(void);
432 extern void tty_default_fops(struct file_operations *fops);
433 extern struct tty_struct *alloc_tty_struct(void);
434 extern void free_tty_struct(struct tty_struct *tty);
435 extern void initialize_tty_struct(struct tty_struct *tty,
436 struct tty_driver *driver, int idx);
437 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
438 int first_ok);
439 extern void tty_release_dev(struct file *filp);
440 extern int tty_init_termios(struct tty_struct *tty);
441
442 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
443 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
444
445 extern struct mutex tty_mutex;
446
447 extern void tty_write_unlock(struct tty_struct *tty);
448 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
449 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
450
451 extern void tty_port_init(struct tty_port *port);
452 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
453 extern void tty_port_free_xmit_buf(struct tty_port *port);
454 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
455 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
456 extern int tty_port_carrier_raised(struct tty_port *port);
457 extern void tty_port_raise_dtr_rts(struct tty_port *port);
458 extern void tty_port_lower_dtr_rts(struct tty_port *port);
459 extern void tty_port_hangup(struct tty_port *port);
460 extern int tty_port_block_til_ready(struct tty_port *port,
461 struct tty_struct *tty, struct file *filp);
462 extern int tty_port_close_start(struct tty_port *port,
463 struct tty_struct *tty, struct file *filp);
464 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
465 extern void tty_port_close(struct tty_port *port,
466 struct tty_struct *tty, struct file *filp);
467 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
468 extern int tty_unregister_ldisc(int disc);
469 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
470 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
471 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
472 extern void tty_ldisc_init(struct tty_struct *tty);
473 extern void tty_ldisc_begin(void);
474 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
475 extern void tty_ldisc_enable(struct tty_struct *tty);
476
477
478 /* n_tty.c */
479 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
480
481 /* tty_audit.c */
482 #ifdef CONFIG_AUDIT
483 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
484 size_t size);
485 extern void tty_audit_exit(void);
486 extern void tty_audit_fork(struct signal_struct *sig);
487 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
488 extern void tty_audit_push(struct tty_struct *tty);
489 extern void tty_audit_push_task(struct task_struct *tsk,
490 uid_t loginuid, u32 sessionid);
491 #else
492 static inline void tty_audit_add_data(struct tty_struct *tty,
493 unsigned char *data, size_t size)
494 {
495 }
496 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
497 {
498 }
499 static inline void tty_audit_exit(void)
500 {
501 }
502 static inline void tty_audit_fork(struct signal_struct *sig)
503 {
504 }
505 static inline void tty_audit_push(struct tty_struct *tty)
506 {
507 }
508 static inline void tty_audit_push_task(struct task_struct *tsk,
509 uid_t loginuid, u32 sessionid)
510 {
511 }
512 #endif
513
514 /* tty_ioctl.c */
515 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
516 unsigned int cmd, unsigned long arg);
517
518 /* serial.c */
519
520 extern void serial_console_init(void);
521
522 /* pcxx.c */
523
524 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
525
526 /* printk.c */
527
528 extern void console_print(const char *);
529
530 /* vt.c */
531
532 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
533 unsigned int cmd, unsigned long arg);
534
535 #endif /* __KERNEL__ */
536 #endif
537
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