5 #include <linux/major.h>
6 #include <linux/termios.h>
7 #include <linux/workqueue.h>
8 #include <linux/tty_driver.h>
9 #include <linux/tty_ldisc.h>
10 #include <linux/mutex.h>
11 #include <linux/tty_flags.h>
12 #include <uapi/linux/tty.h>
13 #include <linux/rwsem.h>
14 #include <linux/llist.h>
19 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
20 * hardcoded at present.)
22 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
23 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
24 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
27 * This character is the same as _POSIX_VDISABLE: it cannot be used as
28 * a c_cc[] character, but indicates that a particular special character
29 * isn't in use (eg VINTR has no character etc)
31 #define __DISABLED_CHAR '\0'
35 struct tty_buffer *next;
36 struct llist_node free;
42 /* Data points here */
43 unsigned long data[0];
46 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
48 return ((unsigned char *)b->data) + ofs;
51 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
53 return (char *)char_buf_ptr(b, ofs) + b->size;
57 * We default to dicing tty buffer allocations to this many characters
58 * in order to avoid multiple page allocations. We know the size of
59 * tty_buffer itself but it must also be taken into account that the
60 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
61 * logic this must match
64 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
68 struct work_struct work;
70 struct tty_buffer sentinel;
71 struct tty_buffer *head; /* Queue head */
72 struct tty_buffer *tail; /* Active buffer */
73 struct llist_head free; /* Free queue head */
74 int memory_used; /* Buffer space used excluding
78 * When a break, frame error, or parity error happens, these codes are
79 * stuffed into the flags buffer.
87 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
88 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
89 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
90 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
91 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
92 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
93 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
94 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
95 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
96 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
97 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
98 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
99 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
100 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
101 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
102 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
103 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
105 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
106 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
107 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
108 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
110 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
111 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
112 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
113 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
114 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
115 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
116 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
117 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
118 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
119 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
120 #define I_IXON(tty) _I_FLAG((tty), IXON)
121 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
122 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
123 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
124 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
126 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
127 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
128 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
129 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
130 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
131 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
132 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
133 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
134 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
135 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
136 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
137 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
138 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
139 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
141 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
142 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
143 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
144 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
145 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
146 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
147 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
148 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
149 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
150 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
152 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
153 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
154 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
155 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
156 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
157 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
158 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
159 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
160 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
161 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
162 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
163 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
164 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
165 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
166 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
167 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
170 struct signal_struct;
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
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.
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. Called
192 under the port mutex to serialize against activate/shutdowns */
193 void (*shutdown)(struct tty_port *port);
194 void (*drop)(struct tty_port *port);
195 /* Called under the port mutex from tty_port_open, serialized using
197 /* FIXME: long term getting the tty argument *out* of this would be
199 int (*activate)(struct tty_port *port, struct tty_struct *tty);
200 /* Called on the final put of a port */
201 void (*destruct)(struct tty_port *port);
205 struct tty_bufhead buf; /* Locked internally */
206 struct tty_struct *tty; /* Back pointer */
207 struct tty_struct *itty; /* internal back ptr */
208 const struct tty_port_operations *ops; /* Port operations */
209 spinlock_t lock; /* Lock protecting tty field */
210 int blocked_open; /* Waiting to open */
211 int count; /* Usage count */
212 wait_queue_head_t open_wait; /* Open waiters */
213 wait_queue_head_t close_wait; /* Close waiters */
214 wait_queue_head_t delta_msr_wait; /* Modem status change */
215 unsigned long flags; /* TTY flags ASY_*/
216 unsigned long iflags; /* TTYP_ internal flags */
217 #define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
218 #define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
219 unsigned char console:1, /* port is a console */
220 low_latency:1; /* direct buffer flush */
221 struct mutex mutex; /* Locking */
222 struct mutex buf_mutex; /* Buffer alloc lock */
223 unsigned char *xmit_buf; /* Optional buffer */
224 unsigned int close_delay; /* Close port delay */
225 unsigned int closing_wait; /* Delay for output */
226 int drain_delay; /* Set to zero if no pure time
227 based drain is needed else
228 set to size of fifo */
229 struct kref kref; /* Ref counter */
233 * Where all of the state associated with a tty is kept while the tty
234 * is open. Since the termios state should be kept even if the tty
235 * has been closed --- for things like the baud rate, etc --- it is
236 * not stored here, but rather a pointer to the real state is stored
237 * here. Possible the winsize structure should have the same
238 * treatment, but (1) the default 80x24 is usually right and (2) it's
239 * most often used by a windowing system, which will set the correct
240 * size each time the window is created or resized anyway.
244 struct tty_operations;
250 struct tty_driver *driver;
251 const struct tty_operations *ops;
254 /* Protects ldisc changes: Lock tty not pty */
255 struct ld_semaphore ldisc_sem;
256 struct tty_ldisc *ldisc;
258 struct mutex atomic_write_lock;
259 struct mutex legacy_mutex;
260 struct mutex throttle_mutex;
261 struct rw_semaphore termios_rwsem;
262 spinlock_t ctrl_lock;
263 /* Termios values are protected by the termios rwsem */
264 struct ktermios termios, termios_locked;
265 struct termiox *termiox; /* May be NULL for unsupported */
267 struct pid *pgrp; /* Protected by ctrl lock */
271 struct winsize winsize; /* termios rwsem */
272 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
273 unsigned char ctrl_status; /* ctrl_lock */
274 unsigned int receive_room; /* Bytes free for queue */
277 struct tty_struct *link;
278 struct fasync_struct *fasync;
279 int alt_speed; /* For magic substitution of 38400 bps */
280 wait_queue_head_t write_wait;
281 wait_queue_head_t read_wait;
282 struct work_struct hangup_work;
285 struct list_head tty_files;
287 #define N_TTY_BUF_SIZE 4096
289 unsigned char closing:1;
290 unsigned char *write_buf;
292 /* If the tty has a pending do_SAK, queue it here - akpm */
293 struct work_struct SAK_work;
294 struct tty_port *port;
297 /* Each of a tty's open files has private_data pointing to tty_file_private */
298 struct tty_file_private {
299 struct tty_struct *tty;
301 struct list_head list;
304 /* tty magic number */
305 #define TTY_MAGIC 0x5401
308 * These bits are used in the flags field of the tty structure.
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.
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_OPEN 11 /* Line discipline is open */
324 #define TTY_PTY_LOCK 16 /* pty private */
325 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
326 #define TTY_HUPPED 18 /* Post driver->hangup() */
327 #define TTY_HUPPING 21 /* ->hangup() in progress */
328 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
330 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
332 /* Values for tty->flow_change */
333 #define TTY_THROTTLE_SAFE 1
334 #define TTY_UNTHROTTLE_SAFE 2
336 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
338 tty->flow_change = val;
341 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
343 tty->flow_change = val;
348 extern void console_init(void);
349 extern void tty_kref_put(struct tty_struct *tty);
350 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
351 extern void tty_vhangup_self(void);
352 extern void disassociate_ctty(int priv);
353 extern dev_t tty_devnum(struct tty_struct *tty);
354 extern void proc_clear_tty(struct task_struct *p);
355 extern struct tty_struct *get_current_tty(void);
357 extern int __init tty_init(void);
359 static inline void console_init(void)
361 static inline void tty_kref_put(struct tty_struct *tty)
363 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
365 static inline void tty_vhangup_self(void)
367 static inline void disassociate_ctty(int priv)
369 static inline dev_t tty_devnum(struct tty_struct *tty)
371 static inline void proc_clear_tty(struct task_struct *p)
373 static inline struct tty_struct *get_current_tty(void)
376 static inline int __init tty_init(void)
380 extern void tty_write_flush(struct tty_struct *);
382 extern struct ktermios tty_std_termios;
384 extern int vcs_init(void);
386 extern struct class *tty_class;
389 * tty_kref_get - get a tty reference
392 * Return a new reference to a tty object. The caller must hold
393 * sufficient locks/counts to ensure that their existing reference cannot
397 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
400 kref_get(&tty->kref);
404 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
405 const char *routine);
406 extern char *tty_name(struct tty_struct *tty, char *buf);
407 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
408 extern int tty_check_change(struct tty_struct *tty);
409 extern void stop_tty(struct tty_struct *tty);
410 extern void start_tty(struct tty_struct *tty);
411 extern int tty_register_driver(struct tty_driver *driver);
412 extern int tty_unregister_driver(struct tty_driver *driver);
413 extern struct device *tty_register_device(struct tty_driver *driver,
414 unsigned index, struct device *dev);
415 extern struct device *tty_register_device_attr(struct tty_driver *driver,
416 unsigned index, struct device *device,
418 const struct attribute_group **attr_grp);
419 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
420 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
422 extern void tty_write_message(struct tty_struct *tty, char *msg);
423 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
424 extern int tty_chars_in_buffer(struct tty_struct *tty);
425 extern int tty_write_room(struct tty_struct *tty);
426 extern void tty_driver_flush_buffer(struct tty_struct *tty);
427 extern void tty_throttle(struct tty_struct *tty);
428 extern void tty_unthrottle(struct tty_struct *tty);
429 extern int tty_throttle_safe(struct tty_struct *tty);
430 extern int tty_unthrottle_safe(struct tty_struct *tty);
431 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
432 extern void tty_driver_remove_tty(struct tty_driver *driver,
433 struct tty_struct *tty);
434 extern void tty_free_termios(struct tty_struct *tty);
435 extern int is_current_pgrp_orphaned(void);
436 extern int is_ignored(int sig);
437 extern int tty_signal(int sig, struct tty_struct *tty);
438 extern void tty_hangup(struct tty_struct *tty);
439 extern void tty_vhangup(struct tty_struct *tty);
440 extern void tty_vhangup_locked(struct tty_struct *tty);
441 extern void tty_unhangup(struct file *filp);
442 extern int tty_hung_up_p(struct file *filp);
443 extern void do_SAK(struct tty_struct *tty);
444 extern void __do_SAK(struct tty_struct *tty);
445 extern void no_tty(void);
446 extern void tty_flush_to_ldisc(struct tty_struct *tty);
447 extern void tty_buffer_free_all(struct tty_port *port);
448 extern void tty_buffer_flush(struct tty_struct *tty);
449 extern void tty_buffer_init(struct tty_port *port);
450 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
451 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
452 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
453 speed_t ibaud, speed_t obaud);
454 extern void tty_encode_baud_rate(struct tty_struct *tty,
455 speed_t ibaud, speed_t obaud);
458 * tty_get_baud_rate - get tty bit rates
461 * Returns the baud rate as an integer for this terminal. The
462 * termios lock must be held by the caller and the terminal bit
463 * flags may be updated.
467 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
469 return tty_termios_baud_rate(&tty->termios);
472 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
473 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
474 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
476 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
477 extern void tty_ldisc_deref(struct tty_ldisc *);
478 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
479 extern void tty_ldisc_hangup(struct tty_struct *tty);
480 extern const struct file_operations tty_ldiscs_proc_fops;
482 extern void tty_wakeup(struct tty_struct *tty);
483 extern void tty_ldisc_flush(struct tty_struct *tty);
485 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
486 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
487 unsigned int cmd, unsigned long arg);
488 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
489 extern void tty_default_fops(struct file_operations *fops);
490 extern struct tty_struct *alloc_tty_struct(void);
491 extern int tty_alloc_file(struct file *file);
492 extern void tty_add_file(struct tty_struct *tty, struct file *file);
493 extern void tty_free_file(struct file *file);
494 extern void free_tty_struct(struct tty_struct *tty);
495 extern void initialize_tty_struct(struct tty_struct *tty,
496 struct tty_driver *driver, int idx);
497 extern void deinitialize_tty_struct(struct tty_struct *tty);
498 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
499 extern int tty_release(struct inode *inode, struct file *filp);
500 extern int tty_init_termios(struct tty_struct *tty);
501 extern int tty_standard_install(struct tty_driver *driver,
502 struct tty_struct *tty);
504 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
505 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
507 extern struct mutex tty_mutex;
508 extern spinlock_t tty_files_lock;
510 extern void tty_write_unlock(struct tty_struct *tty);
511 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
512 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
514 extern void tty_port_init(struct tty_port *port);
515 extern void tty_port_link_device(struct tty_port *port,
516 struct tty_driver *driver, unsigned index);
517 extern struct device *tty_port_register_device(struct tty_port *port,
518 struct tty_driver *driver, unsigned index,
519 struct device *device);
520 extern struct device *tty_port_register_device_attr(struct tty_port *port,
521 struct tty_driver *driver, unsigned index,
522 struct device *device, void *drvdata,
523 const struct attribute_group **attr_grp);
524 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
525 extern void tty_port_free_xmit_buf(struct tty_port *port);
526 extern void tty_port_destroy(struct tty_port *port);
527 extern void tty_port_put(struct tty_port *port);
529 static inline struct tty_port *tty_port_get(struct tty_port *port)
532 kref_get(&port->kref);
536 /* If the cts flow control is enabled, return true. */
537 static inline bool tty_port_cts_enabled(struct tty_port *port)
539 return port->flags & ASYNC_CTS_FLOW;
542 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
543 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
544 extern int tty_port_carrier_raised(struct tty_port *port);
545 extern void tty_port_raise_dtr_rts(struct tty_port *port);
546 extern void tty_port_lower_dtr_rts(struct tty_port *port);
547 extern void tty_port_hangup(struct tty_port *port);
548 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
549 extern void tty_port_tty_wakeup(struct tty_port *port);
550 extern int tty_port_block_til_ready(struct tty_port *port,
551 struct tty_struct *tty, struct file *filp);
552 extern int tty_port_close_start(struct tty_port *port,
553 struct tty_struct *tty, struct file *filp);
554 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
555 extern void tty_port_close(struct tty_port *port,
556 struct tty_struct *tty, struct file *filp);
557 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
558 struct tty_struct *tty);
559 extern int tty_port_open(struct tty_port *port,
560 struct tty_struct *tty, struct file *filp);
561 static inline int tty_port_users(struct tty_port *port)
563 return port->count + port->blocked_open;
566 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
567 extern int tty_unregister_ldisc(int disc);
568 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
569 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
570 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
571 extern void tty_ldisc_init(struct tty_struct *tty);
572 extern void tty_ldisc_deinit(struct tty_struct *tty);
573 extern void tty_ldisc_begin(void);
575 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
578 if (ld->ops->receive_buf2)
579 count = ld->ops->receive_buf2(ld->tty, p, f, count);
581 count = min_t(int, count, ld->tty->receive_room);
583 ld->ops->receive_buf(ld->tty, p, f, count);
590 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
591 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
595 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
596 size_t size, unsigned icanon);
597 extern void tty_audit_exit(void);
598 extern void tty_audit_fork(struct signal_struct *sig);
599 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
600 extern void tty_audit_push(struct tty_struct *tty);
601 extern int tty_audit_push_current(void);
603 static inline void tty_audit_add_data(struct tty_struct *tty,
604 unsigned char *data, size_t size, unsigned icanon)
607 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
610 static inline void tty_audit_exit(void)
613 static inline void tty_audit_fork(struct signal_struct *sig)
616 static inline void tty_audit_push(struct tty_struct *tty)
619 static inline int tty_audit_push_current(void)
626 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
627 unsigned int cmd, unsigned long arg);
628 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
629 unsigned int cmd, unsigned long arg);
633 extern void serial_console_init(void);
637 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
641 extern int vt_ioctl(struct tty_struct *tty,
642 unsigned int cmd, unsigned long arg);
644 extern long vt_compat_ioctl(struct tty_struct *tty,
645 unsigned int cmd, unsigned long arg);
648 /* functions for preparation of BKL removal */
649 extern void __lockfunc tty_lock(struct tty_struct *tty);
650 extern void __lockfunc tty_unlock(struct tty_struct *tty);
651 extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
652 struct tty_struct *tty2);
653 extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
654 struct tty_struct *tty2);
657 * this shall be called only from where BTM is held (like close)
659 * We need this to ensure nobody waits for us to finish while we are waiting.
660 * Without this we were encountering system stalls.
662 * This should be indeed removed with BTM removal later.
664 * Locking: BTM required. Nobody is allowed to hold port->mutex.
666 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
669 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
670 tty_wait_until_sent(tty, timeout);
675 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
677 * The condition we are waiting for might take a long time to
678 * become true, or might depend on another thread taking the
679 * BTM. In either case, we need to drop the BTM to guarantee
680 * forward progress. This is a leftover from the conversion
681 * from the BKL and should eventually get removed as the BTM
684 * Do not use in new code.
686 #define wait_event_interruptible_tty(tty, wq, condition) \
689 if (!(condition)) { \
690 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
695 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
697 DEFINE_WAIT(__wait); \
700 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
703 if (!signal_pending(current)) { \
709 ret = -ERESTARTSYS; \
712 finish_wait(&wq, &__wait); \
715 #ifdef CONFIG_PROC_FS
716 extern void proc_tty_register_driver(struct tty_driver *);
717 extern void proc_tty_unregister_driver(struct tty_driver *);
719 static inline void proc_tty_register_driver(struct tty_driver *d) {}
720 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}