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