tty: Fix formatting in tty.h
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / tty.h
blobc7ea9bc8897cb638208a88bcb6352814b4639dc8
1 #ifndef _LINUX_TTY_H
2 #define _LINUX_TTY_H
4 /*
5 * 'tty.h' defines some structures used by tty_io.c and some defines.
6 */
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 #include <linux/smp_lock.h>
18 #include <asm/system.h>
22 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
23 * hardcoded at present.)
25 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
26 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
27 #define NR_LDISCS 30
29 /* line disciplines */
30 #define N_TTY 0
31 #define N_SLIP 1
32 #define N_MOUSE 2
33 #define N_PPP 3
34 #define N_STRIP 4
35 #define N_AX25 5
36 #define N_X25 6 /* X.25 async */
37 #define N_6PACK 7
38 #define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
39 #define N_R3964 9 /* Reserved for Simatic R3964 module */
40 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
41 #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
42 #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
43 /* cards about SMS messages */
44 #define N_HDLC 13 /* synchronous HDLC */
45 #define N_SYNC_PPP 14 /* synchronous PPP */
46 #define N_HCI 15 /* Bluetooth HCI UART */
47 #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
48 #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
49 #define N_PPS 18 /* Pulse per Second */
50 #define N_V253 19 /* Codec control over voice modem */
51 #define N_CAIF 20 /* CAIF protocol for talking to modems */
52 #define N_GSM0710 21 /* GSM 0710 Mux */
53 #define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
56 * This character is the same as _POSIX_VDISABLE: it cannot be used as
57 * a c_cc[] character, but indicates that a particular special character
58 * isn't in use (eg VINTR has no character etc)
60 #define __DISABLED_CHAR '\0'
62 struct tty_buffer {
63 struct tty_buffer *next;
64 char *char_buf_ptr;
65 unsigned char *flag_buf_ptr;
66 int used;
67 int size;
68 int commit;
69 int read;
70 /* Data points here */
71 unsigned long data[0];
75 * We default to dicing tty buffer allocations to this many characters
76 * in order to avoid multiple page allocations. We know the size of
77 * tty_buffer itself but it must also be taken into account that the
78 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
79 * logic this must match
82 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
85 struct tty_bufhead {
86 struct delayed_work work;
87 spinlock_t lock;
88 struct tty_buffer *head; /* Queue head */
89 struct tty_buffer *tail; /* Active buffer */
90 struct tty_buffer *free; /* Free queue head */
91 int memory_used; /* Buffer space used excluding
92 free queue */
95 * When a break, frame error, or parity error happens, these codes are
96 * stuffed into the flags buffer.
98 #define TTY_NORMAL 0
99 #define TTY_BREAK 1
100 #define TTY_FRAME 2
101 #define TTY_PARITY 3
102 #define TTY_OVERRUN 4
104 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
105 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
106 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
107 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
108 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
109 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
110 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
111 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
112 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
113 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
114 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
115 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
116 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
117 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
118 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
119 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
120 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
122 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
123 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
124 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
125 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
127 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
128 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
129 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
130 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
131 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
132 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
133 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
134 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
135 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
136 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
137 #define I_IXON(tty) _I_FLAG((tty), IXON)
138 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
139 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
140 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
141 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
143 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
144 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
145 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
146 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
147 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
148 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
149 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
150 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
151 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
152 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
153 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
154 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
155 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
156 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
158 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
159 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
160 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
161 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
162 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
163 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
164 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
165 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
166 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
167 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
169 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
170 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
171 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
172 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
173 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
174 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
175 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
176 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
177 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
178 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
179 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
180 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
181 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
182 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
183 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
184 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
186 struct device;
187 struct signal_struct;
190 * Port level information. Each device keeps its own port level information
191 * so provide a common structure for those ports wanting to use common support
192 * routines.
194 * The tty port has a different lifetime to the tty so must be kept apart.
195 * In addition be careful as tty -> port mappings are valid for the life
196 * of the tty object but in many cases port -> tty mappings are valid only
197 * until a hangup so don't use the wrong path.
200 struct tty_port;
202 struct tty_port_operations {
203 /* Return 1 if the carrier is raised */
204 int (*carrier_raised)(struct tty_port *port);
205 /* Control the DTR line */
206 void (*dtr_rts)(struct tty_port *port, int raise);
207 /* Called when the last close completes or a hangup finishes
208 IFF the port was initialized. Do not use to free resources. Called
209 under the port mutex to serialize against activate/shutdowns */
210 void (*shutdown)(struct tty_port *port);
211 void (*drop)(struct tty_port *port);
212 /* Called under the port mutex from tty_port_open, serialized using
213 the port mutex */
214 /* FIXME: long term getting the tty argument *out* of this would be
215 good for consoles */
216 int (*activate)(struct tty_port *port, struct tty_struct *tty);
217 /* Called on the final put of a port */
218 void (*destruct)(struct tty_port *port);
221 struct tty_port {
222 struct tty_struct *tty; /* Back pointer */
223 const struct tty_port_operations *ops; /* Port operations */
224 spinlock_t lock; /* Lock protecting tty field */
225 int blocked_open; /* Waiting to open */
226 int count; /* Usage count */
227 wait_queue_head_t open_wait; /* Open waiters */
228 wait_queue_head_t close_wait; /* Close waiters */
229 wait_queue_head_t delta_msr_wait; /* Modem status change */
230 unsigned long flags; /* TTY flags ASY_*/
231 unsigned char console:1; /* port is a console */
232 struct mutex mutex; /* Locking */
233 struct mutex buf_mutex; /* Buffer alloc lock */
234 unsigned char *xmit_buf; /* Optional buffer */
235 unsigned int close_delay; /* Close port delay */
236 unsigned int closing_wait; /* Delay for output */
237 int drain_delay; /* Set to zero if no pure time
238 based drain is needed else
239 set to size of fifo */
240 struct kref kref; /* Ref counter */
244 * Where all of the state associated with a tty is kept while the tty
245 * is open. Since the termios state should be kept even if the tty
246 * has been closed --- for things like the baud rate, etc --- it is
247 * not stored here, but rather a pointer to the real state is stored
248 * here. Possible the winsize structure should have the same
249 * treatment, but (1) the default 80x24 is usually right and (2) it's
250 * most often used by a windowing system, which will set the correct
251 * size each time the window is created or resized anyway.
252 * - TYT, 9/14/92
255 struct tty_operations;
257 struct tty_struct {
258 int magic;
259 struct kref kref;
260 struct device *dev;
261 struct tty_driver *driver;
262 const struct tty_operations *ops;
263 int index;
265 /* Protects ldisc changes: Lock tty not pty */
266 struct mutex ldisc_mutex;
267 struct tty_ldisc *ldisc;
269 struct mutex termios_mutex;
270 spinlock_t ctrl_lock;
271 /* Termios values are protected by the termios mutex */
272 struct ktermios *termios, *termios_locked;
273 struct termiox *termiox; /* May be NULL for unsupported */
274 char name[64];
275 struct pid *pgrp; /* Protected by ctrl lock */
276 struct pid *session;
277 unsigned long flags;
278 int count;
279 struct winsize winsize; /* termios mutex */
280 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
281 unsigned char low_latency:1, warned:1;
282 unsigned char ctrl_status; /* ctrl_lock */
283 unsigned int receive_room; /* Bytes free for queue */
285 struct tty_struct *link;
286 struct fasync_struct *fasync;
287 struct tty_bufhead buf; /* Locked internally */
288 int alt_speed; /* For magic substitution of 38400 bps */
289 wait_queue_head_t write_wait;
290 wait_queue_head_t read_wait;
291 struct work_struct hangup_work;
292 void *disc_data;
293 void *driver_data;
294 struct list_head tty_files;
296 #define N_TTY_BUF_SIZE 4096
299 * The following is data for the N_TTY line discipline. For
300 * historical reasons, this is included in the tty structure.
301 * Mostly locked by the BKL.
303 unsigned int column;
304 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
305 unsigned char closing:1;
306 unsigned char echo_overrun:1;
307 unsigned short minimum_to_wake;
308 unsigned long overrun_time;
309 int num_overrun;
310 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
311 char *read_buf;
312 int read_head;
313 int read_tail;
314 int read_cnt;
315 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
316 unsigned char *echo_buf;
317 unsigned int echo_pos;
318 unsigned int echo_cnt;
319 int canon_data;
320 unsigned long canon_head;
321 unsigned int canon_column;
322 struct mutex atomic_read_lock;
323 struct mutex atomic_write_lock;
324 struct mutex output_lock;
325 struct mutex echo_lock;
326 unsigned char *write_buf;
327 int write_cnt;
328 spinlock_t read_lock;
329 /* If the tty has a pending do_SAK, queue it here - akpm */
330 struct work_struct SAK_work;
331 struct tty_port *port;
334 /* Each of a tty's open files has private_data pointing to tty_file_private */
335 struct tty_file_private {
336 struct tty_struct *tty;
337 struct file *file;
338 struct list_head list;
341 /* tty magic number */
342 #define TTY_MAGIC 0x5401
345 * These bits are used in the flags field of the tty structure.
347 * So that interrupts won't be able to mess up the queues,
348 * copy_to_cooked must be atomic with respect to itself, as must
349 * tty->write. Thus, you must use the inline functions set_bit() and
350 * clear_bit() to make things atomic.
352 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
353 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
354 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
355 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
356 #define TTY_DEBUG 4 /* Debugging */
357 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
358 #define TTY_PUSH 6 /* n_tty private */
359 #define TTY_CLOSING 7 /* ->close() in progress */
360 #define TTY_LDISC 9 /* Line discipline attached */
361 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
362 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
363 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
364 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
365 #define TTY_PTY_LOCK 16 /* pty private */
366 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
367 #define TTY_HUPPED 18 /* Post driver->hangup() */
368 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
369 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
371 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
373 extern void tty_write_flush(struct tty_struct *);
375 extern struct ktermios tty_std_termios;
377 extern void console_init(void);
378 extern int vcs_init(void);
380 extern struct class *tty_class;
383 * tty_kref_get - get a tty reference
384 * @tty: tty device
386 * Return a new reference to a tty object. The caller must hold
387 * sufficient locks/counts to ensure that their existing reference cannot
388 * go away
391 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
393 if (tty)
394 kref_get(&tty->kref);
395 return tty;
397 extern void tty_kref_put(struct tty_struct *tty);
399 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
400 const char *routine);
401 extern char *tty_name(struct tty_struct *tty, char *buf);
402 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
403 extern int tty_check_change(struct tty_struct *tty);
404 extern void stop_tty(struct tty_struct *tty);
405 extern void start_tty(struct tty_struct *tty);
406 extern int tty_register_driver(struct tty_driver *driver);
407 extern int tty_unregister_driver(struct tty_driver *driver);
408 extern struct device *tty_register_device(struct tty_driver *driver,
409 unsigned index, struct device *dev);
410 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
411 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
412 int buflen);
413 extern void tty_write_message(struct tty_struct *tty, char *msg);
414 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
415 extern int tty_chars_in_buffer(struct tty_struct *tty);
416 extern int tty_write_room(struct tty_struct *tty);
417 extern void tty_driver_flush_buffer(struct tty_struct *tty);
418 extern void tty_throttle(struct tty_struct *tty);
419 extern void tty_unthrottle(struct tty_struct *tty);
420 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
421 extern void tty_shutdown(struct tty_struct *tty);
422 extern void tty_free_termios(struct tty_struct *tty);
423 extern int is_current_pgrp_orphaned(void);
424 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
425 extern int is_ignored(int sig);
426 extern int tty_signal(int sig, struct tty_struct *tty);
427 extern void tty_hangup(struct tty_struct *tty);
428 extern void tty_vhangup(struct tty_struct *tty);
429 extern void tty_vhangup_locked(struct tty_struct *tty);
430 extern void tty_vhangup_self(void);
431 extern void tty_unhangup(struct file *filp);
432 extern int tty_hung_up_p(struct file *filp);
433 extern void do_SAK(struct tty_struct *tty);
434 extern void __do_SAK(struct tty_struct *tty);
435 extern void disassociate_ctty(int priv);
436 extern void no_tty(void);
437 extern void tty_flip_buffer_push(struct tty_struct *tty);
438 extern void tty_flush_to_ldisc(struct tty_struct *tty);
439 extern void tty_buffer_free_all(struct tty_struct *tty);
440 extern void tty_buffer_flush(struct tty_struct *tty);
441 extern void tty_buffer_init(struct tty_struct *tty);
442 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
443 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
444 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
445 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
446 speed_t ibaud, speed_t obaud);
447 extern void tty_encode_baud_rate(struct tty_struct *tty,
448 speed_t ibaud, speed_t obaud);
449 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
450 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
452 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
453 extern void tty_ldisc_deref(struct tty_ldisc *);
454 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
455 extern void tty_ldisc_hangup(struct tty_struct *tty);
456 extern const struct file_operations tty_ldiscs_proc_fops;
458 extern void tty_wakeup(struct tty_struct *tty);
459 extern void tty_ldisc_flush(struct tty_struct *tty);
461 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
462 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
463 unsigned int cmd, unsigned long arg);
464 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
465 extern dev_t tty_devnum(struct tty_struct *tty);
466 extern void proc_clear_tty(struct task_struct *p);
467 extern struct tty_struct *get_current_tty(void);
468 extern void tty_default_fops(struct file_operations *fops);
469 extern struct tty_struct *alloc_tty_struct(void);
470 extern int tty_add_file(struct tty_struct *tty, struct file *file);
471 extern void free_tty_struct(struct tty_struct *tty);
472 extern void initialize_tty_struct(struct tty_struct *tty,
473 struct tty_driver *driver, int idx);
474 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
475 int first_ok);
476 extern int tty_release(struct inode *inode, struct file *filp);
477 extern int tty_init_termios(struct tty_struct *tty);
479 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
480 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
482 extern struct mutex tty_mutex;
483 extern spinlock_t tty_files_lock;
485 extern void tty_write_unlock(struct tty_struct *tty);
486 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
487 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
489 extern void tty_port_init(struct tty_port *port);
490 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
491 extern void tty_port_free_xmit_buf(struct tty_port *port);
492 extern void tty_port_put(struct tty_port *port);
494 static inline struct tty_port *tty_port_get(struct tty_port *port)
496 if (port)
497 kref_get(&port->kref);
498 return port;
501 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
502 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
503 extern int tty_port_carrier_raised(struct tty_port *port);
504 extern void tty_port_raise_dtr_rts(struct tty_port *port);
505 extern void tty_port_lower_dtr_rts(struct tty_port *port);
506 extern void tty_port_hangup(struct tty_port *port);
507 extern int tty_port_block_til_ready(struct tty_port *port,
508 struct tty_struct *tty, struct file *filp);
509 extern int tty_port_close_start(struct tty_port *port,
510 struct tty_struct *tty, struct file *filp);
511 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
512 extern void tty_port_close(struct tty_port *port,
513 struct tty_struct *tty, struct file *filp);
514 extern int tty_port_open(struct tty_port *port,
515 struct tty_struct *tty, struct file *filp);
516 static inline int tty_port_users(struct tty_port *port)
518 return port->count + port->blocked_open;
521 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
522 extern int tty_unregister_ldisc(int disc);
523 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
524 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
525 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
526 extern void tty_ldisc_init(struct tty_struct *tty);
527 extern void tty_ldisc_begin(void);
528 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
529 extern void tty_ldisc_enable(struct tty_struct *tty);
532 /* n_tty.c */
533 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
534 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
536 /* tty_audit.c */
537 #ifdef CONFIG_AUDIT
538 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
539 size_t size);
540 extern void tty_audit_exit(void);
541 extern void tty_audit_fork(struct signal_struct *sig);
542 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
543 extern void tty_audit_push(struct tty_struct *tty);
544 extern int tty_audit_push_task(struct task_struct *tsk,
545 uid_t loginuid, u32 sessionid);
546 #else
547 static inline void tty_audit_add_data(struct tty_struct *tty,
548 unsigned char *data, size_t size)
551 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
554 static inline void tty_audit_exit(void)
557 static inline void tty_audit_fork(struct signal_struct *sig)
560 static inline void tty_audit_push(struct tty_struct *tty)
563 static inline int tty_audit_push_task(struct task_struct *tsk,
564 uid_t loginuid, u32 sessionid)
566 return 0;
568 #endif
570 /* tty_io.c */
571 extern int __init tty_init(void);
573 /* tty_ioctl.c */
574 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
575 unsigned int cmd, unsigned long arg);
577 /* serial.c */
579 extern void serial_console_init(void);
581 /* pcxx.c */
583 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
585 /* vt.c */
587 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
588 unsigned int cmd, unsigned long arg);
590 extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
591 unsigned int cmd, unsigned long arg);
593 /* tty_mutex.c */
594 /* functions for preparation of BKL removal */
595 extern void __lockfunc tty_lock(void) __acquires(tty_lock);
596 extern void __lockfunc tty_unlock(void) __releases(tty_lock);
597 extern struct task_struct *__big_tty_mutex_owner;
598 #define tty_locked() (current == __big_tty_mutex_owner)
601 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
603 * The condition we are waiting for might take a long time to
604 * become true, or might depend on another thread taking the
605 * BTM. In either case, we need to drop the BTM to guarantee
606 * forward progress. This is a leftover from the conversion
607 * from the BKL and should eventually get removed as the BTM
608 * falls out of use.
610 * Do not use in new code.
612 #define wait_event_interruptible_tty(wq, condition) \
613 ({ \
614 int __ret = 0; \
615 if (!(condition)) { \
616 __wait_event_interruptible_tty(wq, condition, __ret); \
618 __ret; \
621 #define __wait_event_interruptible_tty(wq, condition, ret) \
622 do { \
623 DEFINE_WAIT(__wait); \
625 for (;;) { \
626 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
627 if (condition) \
628 break; \
629 if (!signal_pending(current)) { \
630 tty_unlock(); \
631 schedule(); \
632 tty_lock(); \
633 continue; \
635 ret = -ERESTARTSYS; \
636 break; \
638 finish_wait(&wq, &__wait); \
639 } while (0)
642 #endif /* __KERNEL__ */
643 #endif