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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#define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
53#define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */
54#define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */
55
56/*
57 * This character is the same as _POSIX_VDISABLE: it cannot be used as
58 * a c_cc[] character, but indicates that a particular special character
59 * isn't in use (eg VINTR has no character etc)
60 */
61#define __DISABLED_CHAR '\0'
62
63struct tty_buffer {
64 struct tty_buffer *next;
65 char *char_buf_ptr;
66 unsigned char *flag_buf_ptr;
67 int used;
68 int size;
69 int commit;
70 int read;
71 /* Data points here */
72 unsigned long data[0];
73};
74
75/*
76 * We default to dicing tty buffer allocations to this many characters
77 * in order to avoid multiple page allocations. We know the size of
78 * tty_buffer itself but it must also be taken into account that the
79 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
80 * logic this must match
81 */
82
83#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
84
85
86struct tty_bufhead {
87 struct work_struct work;
88 spinlock_t lock;
89 struct tty_buffer *head; /* Queue head */
90 struct tty_buffer *tail; /* Active buffer */
91 struct tty_buffer *free; /* Free queue head */
92 int memory_used; /* Buffer space used excluding
93 free queue */
94};
95/*
96 * When a break, frame error, or parity error happens, these codes are
97 * stuffed into the flags buffer.
98 */
99#define TTY_NORMAL 0
100#define TTY_BREAK 1
101#define TTY_FRAME 2
102#define TTY_PARITY 3
103#define TTY_OVERRUN 4
104
105#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
106#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
107#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
108#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
109#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
110#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
111#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
112#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
113#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
114#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
115#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
116#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
117#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
118#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
119#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
120#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
121#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
122
123#define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
124#define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
125#define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
126#define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
127
128#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
129#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
130#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
131#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
132#define I_INPCK(tty) _I_FLAG((tty), INPCK)
133#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
134#define I_INLCR(tty) _I_FLAG((tty), INLCR)
135#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
136#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
137#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
138#define I_IXON(tty) _I_FLAG((tty), IXON)
139#define I_IXANY(tty) _I_FLAG((tty), IXANY)
140#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
141#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
142#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
143
144#define O_OPOST(tty) _O_FLAG((tty), OPOST)
145#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
146#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
147#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
148#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
149#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
150#define O_OFILL(tty) _O_FLAG((tty), OFILL)
151#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
152#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
153#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
154#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
155#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
156#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
157#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
158
159#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
160#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
161#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
162#define C_CREAD(tty) _C_FLAG((tty), CREAD)
163#define C_PARENB(tty) _C_FLAG((tty), PARENB)
164#define C_PARODD(tty) _C_FLAG((tty), PARODD)
165#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
166#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
167#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
168#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
169
170#define L_ISIG(tty) _L_FLAG((tty), ISIG)
171#define L_ICANON(tty) _L_FLAG((tty), ICANON)
172#define L_XCASE(tty) _L_FLAG((tty), XCASE)
173#define L_ECHO(tty) _L_FLAG((tty), ECHO)
174#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
175#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
176#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
177#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
178#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
179#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
180#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
181#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
182#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
183#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
184#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
185#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
186
187struct device;
188struct signal_struct;
189
190/*
191 * Port level information. Each device keeps its own port level information
192 * so provide a common structure for those ports wanting to use common support
193 * routines.
194 *
195 * The tty port has a different lifetime to the tty so must be kept apart.
196 * In addition be careful as tty -> port mappings are valid for the life
197 * of the tty object but in many cases port -> tty mappings are valid only
198 * until a hangup so don't use the wrong path.
199 */
200
201struct tty_port;
202
203struct tty_port_operations {
204 /* Return 1 if the carrier is raised */
205 int (*carrier_raised)(struct tty_port *port);
206 /* Control the DTR line */
207 void (*dtr_rts)(struct tty_port *port, int raise);
208 /* Called when the last close completes or a hangup finishes
209 IFF the port was initialized. Do not use to free resources. Called
210 under the port mutex to serialize against activate/shutdowns */
211 void (*shutdown)(struct tty_port *port);
212 void (*drop)(struct tty_port *port);
213 /* Called under the port mutex from tty_port_open, serialized using
214 the port mutex */
215 /* FIXME: long term getting the tty argument *out* of this would be
216 good for consoles */
217 int (*activate)(struct tty_port *port, struct tty_struct *tty);
218 /* Called on the final put of a port */
219 void (*destruct)(struct tty_port *port);
220};
221
222struct tty_port {
223 struct tty_struct *tty; /* Back pointer */
224 const struct tty_port_operations *ops; /* Port operations */
225 spinlock_t lock; /* Lock protecting tty field */
226 int blocked_open; /* Waiting to open */
227 int count; /* Usage count */
228 wait_queue_head_t open_wait; /* Open waiters */
229 wait_queue_head_t close_wait; /* Close waiters */
230 wait_queue_head_t delta_msr_wait; /* Modem status change */
231 unsigned long flags; /* TTY flags ASY_*/
232 unsigned char console:1; /* port is a console */
233 struct mutex mutex; /* Locking */
234 struct mutex buf_mutex; /* Buffer alloc lock */
235 unsigned char *xmit_buf; /* Optional buffer */
236 unsigned int close_delay; /* Close port delay */
237 unsigned int closing_wait; /* Delay for output */
238 int drain_delay; /* Set to zero if no pure time
239 based drain is needed else
240 set to size of fifo */
241 struct kref kref; /* Ref counter */
242};
243
244/*
245 * Where all of the state associated with a tty is kept while the tty
246 * is open. Since the termios state should be kept even if the tty
247 * has been closed --- for things like the baud rate, etc --- it is
248 * not stored here, but rather a pointer to the real state is stored
249 * here. Possible the winsize structure should have the same
250 * treatment, but (1) the default 80x24 is usually right and (2) it's
251 * most often used by a windowing system, which will set the correct
252 * size each time the window is created or resized anyway.
253 * - TYT, 9/14/92
254 */
255
256struct tty_operations;
257
258struct tty_struct {
259 int magic;
260 struct kref kref;
261 struct device *dev;
262 struct tty_driver *driver;
263 const struct tty_operations *ops;
264 int index;
265
266 /* Protects ldisc changes: Lock tty not pty */
267 struct mutex ldisc_mutex;
268 struct tty_ldisc *ldisc;
269
270 struct mutex termios_mutex;
271 spinlock_t ctrl_lock;
272 /* Termios values are protected by the termios mutex */
273 struct ktermios *termios, *termios_locked;
274 struct termiox *termiox; /* May be NULL for unsupported */
275 char name[64];
276 struct pid *pgrp; /* Protected by ctrl lock */
277 struct pid *session;
278 unsigned long flags;
279 int count;
280 struct winsize winsize; /* termios mutex */
281 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
282 unsigned char low_latency:1, warned:1;
283 unsigned char ctrl_status; /* ctrl_lock */
284 unsigned int receive_room; /* Bytes free for queue */
285
286 struct tty_struct *link;
287 struct fasync_struct *fasync;
288 struct tty_bufhead buf; /* Locked internally */
289 int alt_speed; /* For magic substitution of 38400 bps */
290 wait_queue_head_t write_wait;
291 wait_queue_head_t read_wait;
292 struct work_struct hangup_work;
293 void *disc_data;
294 void *driver_data;
295 struct list_head tty_files;
296
297#define N_TTY_BUF_SIZE 4096
298
299 /*
300 * The following is data for the N_TTY line discipline. For
301 * historical reasons, this is included in the tty structure.
302 * Mostly locked by the BKL.
303 */
304 unsigned int column;
305 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
306 unsigned char closing:1;
307 unsigned char echo_overrun:1;
308 unsigned short minimum_to_wake;
309 unsigned long overrun_time;
310 int num_overrun;
311 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
312 char *read_buf;
313 int read_head;
314 int read_tail;
315 int read_cnt;
316 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
317 unsigned char *echo_buf;
318 unsigned int echo_pos;
319 unsigned int echo_cnt;
320 int canon_data;
321 unsigned long canon_head;
322 unsigned int canon_column;
323 struct mutex atomic_read_lock;
324 struct mutex atomic_write_lock;
325 struct mutex output_lock;
326 struct mutex echo_lock;
327 unsigned char *write_buf;
328 int write_cnt;
329 spinlock_t read_lock;
330 /* If the tty has a pending do_SAK, queue it here - akpm */
331 struct work_struct SAK_work;
332 struct tty_port *port;
333};
334
335/* Each of a tty's open files has private_data pointing to tty_file_private */
336struct tty_file_private {
337 struct tty_struct *tty;
338 struct file *file;
339 struct list_head list;
340};
341
342/* tty magic number */
343#define TTY_MAGIC 0x5401
344
345/*
346 * These bits are used in the flags field of the tty structure.
347 *
348 * So that interrupts won't be able to mess up the queues,
349 * copy_to_cooked must be atomic with respect to itself, as must
350 * tty->write. Thus, you must use the inline functions set_bit() and
351 * clear_bit() to make things atomic.
352 */
353#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
354#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
355#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
356#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
357#define TTY_DEBUG 4 /* Debugging */
358#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
359#define TTY_PUSH 6 /* n_tty private */
360#define TTY_CLOSING 7 /* ->close() in progress */
361#define TTY_LDISC 9 /* Line discipline attached */
362#define TTY_LDISC_CHANGING 10 /* Line discipline changing */
363#define TTY_LDISC_OPEN 11 /* Line discipline is open */
364#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
365#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
366#define TTY_PTY_LOCK 16 /* pty private */
367#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
368#define TTY_HUPPED 18 /* Post driver->hangup() */
369#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
370#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
371#define TTY_HUPPING 21 /* ->hangup() in progress */
372
373#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
374
375extern void tty_write_flush(struct tty_struct *);
376
377extern struct ktermios tty_std_termios;
378
379extern void console_init(void);
380extern int vcs_init(void);
381
382extern struct class *tty_class;
383
384/**
385 * tty_kref_get - get a tty reference
386 * @tty: tty device
387 *
388 * Return a new reference to a tty object. The caller must hold
389 * sufficient locks/counts to ensure that their existing reference cannot
390 * go away
391 */
392
393static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
394{
395 if (tty)
396 kref_get(&tty->kref);
397 return tty;
398}
399extern void tty_kref_put(struct tty_struct *tty);
400
401extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
402 const char *routine);
403extern char *tty_name(struct tty_struct *tty, char *buf);
404extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
405extern int tty_check_change(struct tty_struct *tty);
406extern void stop_tty(struct tty_struct *tty);
407extern void start_tty(struct tty_struct *tty);
408extern int tty_register_driver(struct tty_driver *driver);
409extern int tty_unregister_driver(struct tty_driver *driver);
410extern struct device *tty_register_device(struct tty_driver *driver,
411 unsigned index, struct device *dev);
412extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
413extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
414 int buflen);
415extern void tty_write_message(struct tty_struct *tty, char *msg);
416extern int tty_put_char(struct tty_struct *tty, unsigned char c);
417extern int tty_chars_in_buffer(struct tty_struct *tty);
418extern int tty_write_room(struct tty_struct *tty);
419extern void tty_driver_flush_buffer(struct tty_struct *tty);
420extern void tty_throttle(struct tty_struct *tty);
421extern void tty_unthrottle(struct tty_struct *tty);
422extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
423extern void tty_shutdown(struct tty_struct *tty);
424extern void tty_free_termios(struct tty_struct *tty);
425extern int is_current_pgrp_orphaned(void);
426extern struct pid *tty_get_pgrp(struct tty_struct *tty);
427extern int is_ignored(int sig);
428extern int tty_signal(int sig, struct tty_struct *tty);
429extern void tty_hangup(struct tty_struct *tty);
430extern void tty_vhangup(struct tty_struct *tty);
431extern void tty_vhangup_locked(struct tty_struct *tty);
432extern void tty_vhangup_self(void);
433extern void tty_unhangup(struct file *filp);
434extern int tty_hung_up_p(struct file *filp);
435extern void do_SAK(struct tty_struct *tty);
436extern void __do_SAK(struct tty_struct *tty);
437extern void disassociate_ctty(int priv);
438extern void no_tty(void);
439extern void tty_flip_buffer_push(struct tty_struct *tty);
440extern void tty_flush_to_ldisc(struct tty_struct *tty);
441extern void tty_buffer_free_all(struct tty_struct *tty);
442extern void tty_buffer_flush(struct tty_struct *tty);
443extern void tty_buffer_init(struct tty_struct *tty);
444extern speed_t tty_get_baud_rate(struct tty_struct *tty);
445extern speed_t tty_termios_baud_rate(struct ktermios *termios);
446extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
447extern void tty_termios_encode_baud_rate(struct ktermios *termios,
448 speed_t ibaud, speed_t obaud);
449extern void tty_encode_baud_rate(struct tty_struct *tty,
450 speed_t ibaud, speed_t obaud);
451extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
452extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
453extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
454
455extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
456extern void tty_ldisc_deref(struct tty_ldisc *);
457extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
458extern void tty_ldisc_hangup(struct tty_struct *tty);
459extern const struct file_operations tty_ldiscs_proc_fops;
460
461extern void tty_wakeup(struct tty_struct *tty);
462extern void tty_ldisc_flush(struct tty_struct *tty);
463
464extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
465extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
466 unsigned int cmd, unsigned long arg);
467extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
468extern dev_t tty_devnum(struct tty_struct *tty);
469extern void proc_clear_tty(struct task_struct *p);
470extern struct tty_struct *get_current_tty(void);
471extern void tty_default_fops(struct file_operations *fops);
472extern struct tty_struct *alloc_tty_struct(void);
473extern int tty_add_file(struct tty_struct *tty, struct file *file);
474extern void free_tty_struct(struct tty_struct *tty);
475extern void initialize_tty_struct(struct tty_struct *tty,
476 struct tty_driver *driver, int idx);
477extern void deinitialize_tty_struct(struct tty_struct *tty);
478extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
479 int first_ok);
480extern int tty_release(struct inode *inode, struct file *filp);
481extern int tty_init_termios(struct tty_struct *tty);
482
483extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
484extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
485
486extern struct mutex tty_mutex;
487extern spinlock_t tty_files_lock;
488
489extern void tty_write_unlock(struct tty_struct *tty);
490extern int tty_write_lock(struct tty_struct *tty, int ndelay);
491#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
492
493extern void tty_port_init(struct tty_port *port);
494extern int tty_port_alloc_xmit_buf(struct tty_port *port);
495extern void tty_port_free_xmit_buf(struct tty_port *port);
496extern void tty_port_put(struct tty_port *port);
497
498static inline struct tty_port *tty_port_get(struct tty_port *port)
499{
500 if (port)
501 kref_get(&port->kref);
502 return port;
503}
504
505extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
506extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
507extern int tty_port_carrier_raised(struct tty_port *port);
508extern void tty_port_raise_dtr_rts(struct tty_port *port);
509extern void tty_port_lower_dtr_rts(struct tty_port *port);
510extern void tty_port_hangup(struct tty_port *port);
511extern int tty_port_block_til_ready(struct tty_port *port,
512 struct tty_struct *tty, struct file *filp);
513extern int tty_port_close_start(struct tty_port *port,
514 struct tty_struct *tty, struct file *filp);
515extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
516extern void tty_port_close(struct tty_port *port,
517 struct tty_struct *tty, struct file *filp);
518extern int tty_port_open(struct tty_port *port,
519 struct tty_struct *tty, struct file *filp);
520static inline int tty_port_users(struct tty_port *port)
521{
522 return port->count + port->blocked_open;
523}
524
525extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
526extern int tty_unregister_ldisc(int disc);
527extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
528extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
529extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
530extern void tty_ldisc_init(struct tty_struct *tty);
531extern void tty_ldisc_deinit(struct tty_struct *tty);
532extern void tty_ldisc_begin(void);
533/* This last one is just for the tty layer internals and shouldn't be used elsewhere */
534extern void tty_ldisc_enable(struct tty_struct *tty);
535
536
537/* n_tty.c */
538extern struct tty_ldisc_ops tty_ldisc_N_TTY;
539extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
540
541/* tty_audit.c */
542#ifdef CONFIG_AUDIT
543extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
544 size_t size);
545extern void tty_audit_exit(void);
546extern void tty_audit_fork(struct signal_struct *sig);
547extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
548extern void tty_audit_push(struct tty_struct *tty);
549extern int tty_audit_push_task(struct task_struct *tsk,
550 uid_t loginuid, u32 sessionid);
551#else
552static inline void tty_audit_add_data(struct tty_struct *tty,
553 unsigned char *data, size_t size)
554{
555}
556static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
557{
558}
559static inline void tty_audit_exit(void)
560{
561}
562static inline void tty_audit_fork(struct signal_struct *sig)
563{
564}
565static inline void tty_audit_push(struct tty_struct *tty)
566{
567}
568static inline int tty_audit_push_task(struct task_struct *tsk,
569 uid_t loginuid, u32 sessionid)
570{
571 return 0;
572}
573#endif
574
575/* tty_io.c */
576extern int __init tty_init(void);
577
578/* tty_ioctl.c */
579extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
580 unsigned int cmd, unsigned long arg);
581
582/* serial.c */
583
584extern void serial_console_init(void);
585
586/* pcxx.c */
587
588extern int pcxe_open(struct tty_struct *tty, struct file *filp);
589
590/* vt.c */
591
592extern int vt_ioctl(struct tty_struct *tty,
593 unsigned int cmd, unsigned long arg);
594
595extern long vt_compat_ioctl(struct tty_struct *tty,
596 unsigned int cmd, unsigned long arg);
597
598/* tty_mutex.c */
599/* functions for preparation of BKL removal */
600extern void __lockfunc tty_lock(void) __acquires(tty_lock);
601extern void __lockfunc tty_unlock(void) __releases(tty_lock);
602extern struct task_struct *__big_tty_mutex_owner;
603#define tty_locked() (current == __big_tty_mutex_owner)
604
605/*
606 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
607 *
608 * The condition we are waiting for might take a long time to
609 * become true, or might depend on another thread taking the
610 * BTM. In either case, we need to drop the BTM to guarantee
611 * forward progress. This is a leftover from the conversion
612 * from the BKL and should eventually get removed as the BTM
613 * falls out of use.
614 *
615 * Do not use in new code.
616 */
617#define wait_event_interruptible_tty(wq, condition) \
618({ \
619 int __ret = 0; \
620 if (!(condition)) { \
621 __wait_event_interruptible_tty(wq, condition, __ret); \
622 } \
623 __ret; \
624})
625
626#define __wait_event_interruptible_tty(wq, condition, ret) \
627do { \
628 DEFINE_WAIT(__wait); \
629 \
630 for (;;) { \
631 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
632 if (condition) \
633 break; \
634 if (!signal_pending(current)) { \
635 tty_unlock(); \
636 schedule(); \
637 tty_lock(); \
638 continue; \
639 } \
640 ret = -ERESTARTSYS; \
641 break; \
642 } \
643 finish_wait(&wq, &__wait); \
644} while (0)
645
646
647#endif /* __KERNEL__ */
648#endif