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 tty_buffer *head; /* Queue head */
69 struct work_struct work;
70 struct mutex flush_mutex;
71 struct tty_buffer sentinel;
72 struct llist_head free; /* Free queue head */
73 atomic_t memory_used; /* In-use buffers excluding free list */
74 struct tty_buffer *tail; /* Active buffer */
77 * When a break, frame error, or parity error happens, these codes are
78 * stuffed into the flags buffer.
86 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
87 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
88 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
89 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
90 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
91 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
92 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
93 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
94 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
95 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
96 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
97 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
98 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
99 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
100 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
101 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
102 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
104 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
105 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
106 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
107 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
109 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
110 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
111 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
112 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
113 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
114 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
115 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
116 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
117 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
118 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
119 #define I_IXON(tty) _I_FLAG((tty), IXON)
120 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
121 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
122 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
123 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
125 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
126 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
127 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
128 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
129 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
130 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
131 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
132 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
133 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
134 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
135 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
136 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
137 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
138 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
140 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
141 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
142 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
143 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
144 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
145 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
146 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
147 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
148 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
149 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
151 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
152 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
153 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
154 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
155 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
156 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
157 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
158 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
159 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
160 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
161 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
162 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
163 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
164 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
165 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
166 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
169 struct signal_struct;
172 * Port level information. Each device keeps its own port level information
173 * so provide a common structure for those ports wanting to use common support
176 * The tty port has a different lifetime to the tty so must be kept apart.
177 * In addition be careful as tty -> port mappings are valid for the life
178 * of the tty object but in many cases port -> tty mappings are valid only
179 * until a hangup so don't use the wrong path.
184 struct tty_port_operations {
185 /* Return 1 if the carrier is raised */
186 int (*carrier_raised)(struct tty_port *port);
187 /* Control the DTR line */
188 void (*dtr_rts)(struct tty_port *port, int raise);
189 /* Called when the last close completes or a hangup finishes
190 IFF the port was initialized. Do not use to free resources. Called
191 under the port mutex to serialize against activate/shutdowns */
192 void (*shutdown)(struct tty_port *port);
193 void (*drop)(struct tty_port *port);
194 /* Called under the port mutex from tty_port_open, serialized using
196 /* FIXME: long term getting the tty argument *out* of this would be
198 int (*activate)(struct tty_port *port, struct tty_struct *tty);
199 /* Called on the final put of a port */
200 void (*destruct)(struct tty_port *port);
204 struct tty_bufhead buf; /* Locked internally */
205 struct tty_struct *tty; /* Back pointer */
206 struct tty_struct *itty; /* internal back ptr */
207 const struct tty_port_operations *ops; /* Port operations */
208 spinlock_t lock; /* Lock protecting tty field */
209 int blocked_open; /* Waiting to open */
210 int count; /* Usage count */
211 wait_queue_head_t open_wait; /* Open waiters */
212 wait_queue_head_t close_wait; /* Close waiters */
213 wait_queue_head_t delta_msr_wait; /* Modem status change */
214 unsigned long flags; /* TTY flags ASY_*/
215 unsigned long iflags; /* TTYP_ internal flags */
216 #define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
217 unsigned char console:1, /* port is a console */
218 low_latency:1; /* direct buffer flush */
219 struct mutex mutex; /* Locking */
220 struct mutex buf_mutex; /* Buffer alloc lock */
221 unsigned char *xmit_buf; /* Optional buffer */
222 unsigned int close_delay; /* Close port delay */
223 unsigned int closing_wait; /* Delay for output */
224 int drain_delay; /* Set to zero if no pure time
225 based drain is needed else
226 set to size of fifo */
227 struct kref kref; /* Ref counter */
231 * Where all of the state associated with a tty is kept while the tty
232 * is open. Since the termios state should be kept even if the tty
233 * has been closed --- for things like the baud rate, etc --- it is
234 * not stored here, but rather a pointer to the real state is stored
235 * here. Possible the winsize structure should have the same
236 * treatment, but (1) the default 80x24 is usually right and (2) it's
237 * most often used by a windowing system, which will set the correct
238 * size each time the window is created or resized anyway.
242 struct tty_operations;
248 struct tty_driver *driver;
249 const struct tty_operations *ops;
252 /* Protects ldisc changes: Lock tty not pty */
253 struct ld_semaphore ldisc_sem;
254 struct tty_ldisc *ldisc;
256 struct mutex atomic_write_lock;
257 struct mutex legacy_mutex;
258 struct mutex throttle_mutex;
259 struct rw_semaphore termios_rwsem;
260 spinlock_t ctrl_lock;
261 /* Termios values are protected by the termios rwsem */
262 struct ktermios termios, termios_locked;
263 struct termiox *termiox; /* May be NULL for unsupported */
265 struct pid *pgrp; /* Protected by ctrl lock */
269 struct winsize winsize; /* termios rwsem */
270 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
271 unsigned char ctrl_status; /* ctrl_lock */
272 unsigned int receive_room; /* Bytes free for queue */
275 struct tty_struct *link;
276 struct fasync_struct *fasync;
277 int alt_speed; /* For magic substitution of 38400 bps */
278 wait_queue_head_t write_wait;
279 wait_queue_head_t read_wait;
280 struct work_struct hangup_work;
283 struct list_head tty_files;
285 #define N_TTY_BUF_SIZE 4096
287 unsigned char closing:1;
288 unsigned char *write_buf;
290 /* If the tty has a pending do_SAK, queue it here - akpm */
291 struct work_struct SAK_work;
292 struct tty_port *port;
295 /* Each of a tty's open files has private_data pointing to tty_file_private */
296 struct tty_file_private {
297 struct tty_struct *tty;
299 struct list_head list;
302 /* tty magic number */
303 #define TTY_MAGIC 0x5401
306 * These bits are used in the flags field of the tty structure.
308 * So that interrupts won't be able to mess up the queues,
309 * copy_to_cooked must be atomic with respect to itself, as must
310 * tty->write. Thus, you must use the inline functions set_bit() and
311 * clear_bit() to make things atomic.
313 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
314 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
315 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
316 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
317 #define TTY_DEBUG 4 /* Debugging */
318 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
319 #define TTY_PUSH 6 /* n_tty private */
320 #define TTY_CLOSING 7 /* ->close() in progress */
321 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
322 #define TTY_PTY_LOCK 16 /* pty private */
323 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
324 #define TTY_HUPPED 18 /* Post driver->hangup() */
325 #define TTY_HUPPING 21 /* ->hangup() in progress */
326 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
328 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
330 /* Values for tty->flow_change */
331 #define TTY_THROTTLE_SAFE 1
332 #define TTY_UNTHROTTLE_SAFE 2
334 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
336 tty->flow_change = val;
339 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
341 tty->flow_change = val;
346 extern void console_init(void);
347 extern void tty_kref_put(struct tty_struct *tty);
348 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
349 extern void tty_vhangup_self(void);
350 extern void disassociate_ctty(int priv);
351 extern dev_t tty_devnum(struct tty_struct *tty);
352 extern void proc_clear_tty(struct task_struct *p);
353 extern struct tty_struct *get_current_tty(void);
355 extern int __init tty_init(void);
357 static inline void console_init(void)
359 static inline void tty_kref_put(struct tty_struct *tty)
361 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
363 static inline void tty_vhangup_self(void)
365 static inline void disassociate_ctty(int priv)
367 static inline dev_t tty_devnum(struct tty_struct *tty)
369 static inline void proc_clear_tty(struct task_struct *p)
371 static inline struct tty_struct *get_current_tty(void)
374 static inline int __init tty_init(void)
378 extern void tty_write_flush(struct tty_struct *);
380 extern struct ktermios tty_std_termios;
382 extern int vcs_init(void);
384 extern struct class *tty_class;
387 * tty_kref_get - get a tty reference
390 * Return a new reference to a tty object. The caller must hold
391 * sufficient locks/counts to ensure that their existing reference cannot
395 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
398 kref_get(&tty->kref);
402 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
403 const char *routine);
404 extern char *tty_name(struct tty_struct *tty, char *buf);
405 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
406 extern int tty_check_change(struct tty_struct *tty);
407 extern void stop_tty(struct tty_struct *tty);
408 extern void start_tty(struct tty_struct *tty);
409 extern int tty_register_driver(struct tty_driver *driver);
410 extern int tty_unregister_driver(struct tty_driver *driver);
411 extern struct device *tty_register_device(struct tty_driver *driver,
412 unsigned index, struct device *dev);
413 extern struct device *tty_register_device_attr(struct tty_driver *driver,
414 unsigned index, struct device *device,
416 const struct attribute_group **attr_grp);
417 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
418 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
420 extern void tty_write_message(struct tty_struct *tty, char *msg);
421 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
422 extern int tty_chars_in_buffer(struct tty_struct *tty);
423 extern int tty_write_room(struct tty_struct *tty);
424 extern void tty_driver_flush_buffer(struct tty_struct *tty);
425 extern void tty_throttle(struct tty_struct *tty);
426 extern void tty_unthrottle(struct tty_struct *tty);
427 extern int tty_throttle_safe(struct tty_struct *tty);
428 extern int tty_unthrottle_safe(struct tty_struct *tty);
429 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
430 extern void tty_driver_remove_tty(struct tty_driver *driver,
431 struct tty_struct *tty);
432 extern void tty_free_termios(struct tty_struct *tty);
433 extern int is_current_pgrp_orphaned(void);
434 extern int is_ignored(int sig);
435 extern int tty_signal(int sig, struct tty_struct *tty);
436 extern void tty_hangup(struct tty_struct *tty);
437 extern void tty_vhangup(struct tty_struct *tty);
438 extern void tty_vhangup_locked(struct tty_struct *tty);
439 extern void tty_unhangup(struct file *filp);
440 extern int tty_hung_up_p(struct file *filp);
441 extern void do_SAK(struct tty_struct *tty);
442 extern void __do_SAK(struct tty_struct *tty);
443 extern void no_tty(void);
444 extern void tty_flush_to_ldisc(struct tty_struct *tty);
445 extern void tty_buffer_free_all(struct tty_port *port);
446 extern void tty_buffer_flush(struct tty_struct *tty);
447 extern void tty_buffer_init(struct tty_port *port);
448 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
449 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
450 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
451 speed_t ibaud, speed_t obaud);
452 extern void tty_encode_baud_rate(struct tty_struct *tty,
453 speed_t ibaud, speed_t obaud);
456 * tty_get_baud_rate - get tty bit rates
459 * Returns the baud rate as an integer for this terminal. The
460 * termios lock must be held by the caller and the terminal bit
461 * flags may be updated.
465 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
467 return tty_termios_baud_rate(&tty->termios);
470 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
471 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
472 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
474 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
475 extern void tty_ldisc_deref(struct tty_ldisc *);
476 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
477 extern void tty_ldisc_hangup(struct tty_struct *tty);
478 extern const struct file_operations tty_ldiscs_proc_fops;
480 extern void tty_wakeup(struct tty_struct *tty);
481 extern void tty_ldisc_flush(struct tty_struct *tty);
483 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
484 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
485 unsigned int cmd, unsigned long arg);
486 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
487 extern void tty_default_fops(struct file_operations *fops);
488 extern struct tty_struct *alloc_tty_struct(void);
489 extern int tty_alloc_file(struct file *file);
490 extern void tty_add_file(struct tty_struct *tty, struct file *file);
491 extern void tty_free_file(struct file *file);
492 extern void free_tty_struct(struct tty_struct *tty);
493 extern void initialize_tty_struct(struct tty_struct *tty,
494 struct tty_driver *driver, int idx);
495 extern void deinitialize_tty_struct(struct tty_struct *tty);
496 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
497 extern int tty_release(struct inode *inode, struct file *filp);
498 extern int tty_init_termios(struct tty_struct *tty);
499 extern int tty_standard_install(struct tty_driver *driver,
500 struct tty_struct *tty);
502 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
503 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
505 extern struct mutex tty_mutex;
506 extern spinlock_t tty_files_lock;
508 extern void tty_write_unlock(struct tty_struct *tty);
509 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
510 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
512 extern void tty_port_init(struct tty_port *port);
513 extern void tty_port_link_device(struct tty_port *port,
514 struct tty_driver *driver, unsigned index);
515 extern struct device *tty_port_register_device(struct tty_port *port,
516 struct tty_driver *driver, unsigned index,
517 struct device *device);
518 extern struct device *tty_port_register_device_attr(struct tty_port *port,
519 struct tty_driver *driver, unsigned index,
520 struct device *device, void *drvdata,
521 const struct attribute_group **attr_grp);
522 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
523 extern void tty_port_free_xmit_buf(struct tty_port *port);
524 extern void tty_port_destroy(struct tty_port *port);
525 extern void tty_port_put(struct tty_port *port);
527 static inline struct tty_port *tty_port_get(struct tty_port *port)
530 kref_get(&port->kref);
534 /* If the cts flow control is enabled, return true. */
535 static inline bool tty_port_cts_enabled(struct tty_port *port)
537 return port->flags & ASYNC_CTS_FLOW;
540 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
541 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
542 extern int tty_port_carrier_raised(struct tty_port *port);
543 extern void tty_port_raise_dtr_rts(struct tty_port *port);
544 extern void tty_port_lower_dtr_rts(struct tty_port *port);
545 extern void tty_port_hangup(struct tty_port *port);
546 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
547 extern void tty_port_tty_wakeup(struct tty_port *port);
548 extern int tty_port_block_til_ready(struct tty_port *port,
549 struct tty_struct *tty, struct file *filp);
550 extern int tty_port_close_start(struct tty_port *port,
551 struct tty_struct *tty, struct file *filp);
552 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
553 extern void tty_port_close(struct tty_port *port,
554 struct tty_struct *tty, struct file *filp);
555 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
556 struct tty_struct *tty);
557 extern int tty_port_open(struct tty_port *port,
558 struct tty_struct *tty, struct file *filp);
559 static inline int tty_port_users(struct tty_port *port)
561 return port->count + port->blocked_open;
564 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
565 extern int tty_unregister_ldisc(int disc);
566 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
567 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
568 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
569 extern void tty_ldisc_init(struct tty_struct *tty);
570 extern void tty_ldisc_deinit(struct tty_struct *tty);
571 extern void tty_ldisc_begin(void);
573 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
576 if (ld->ops->receive_buf2)
577 count = ld->ops->receive_buf2(ld->tty, p, f, count);
579 count = min_t(int, count, ld->tty->receive_room);
581 ld->ops->receive_buf(ld->tty, p, f, count);
588 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
589 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
593 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
594 size_t size, unsigned icanon);
595 extern void tty_audit_exit(void);
596 extern void tty_audit_fork(struct signal_struct *sig);
597 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
598 extern void tty_audit_push(struct tty_struct *tty);
599 extern int tty_audit_push_current(void);
601 static inline void tty_audit_add_data(struct tty_struct *tty,
602 unsigned char *data, size_t size, unsigned icanon)
605 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
608 static inline void tty_audit_exit(void)
611 static inline void tty_audit_fork(struct signal_struct *sig)
614 static inline void tty_audit_push(struct tty_struct *tty)
617 static inline int tty_audit_push_current(void)
624 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
625 unsigned int cmd, unsigned long arg);
626 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
627 unsigned int cmd, unsigned long arg);
631 extern void serial_console_init(void);
635 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
639 extern int vt_ioctl(struct tty_struct *tty,
640 unsigned int cmd, unsigned long arg);
642 extern long vt_compat_ioctl(struct tty_struct *tty,
643 unsigned int cmd, unsigned long arg);
646 /* functions for preparation of BKL removal */
647 extern void __lockfunc tty_lock(struct tty_struct *tty);
648 extern void __lockfunc tty_unlock(struct tty_struct *tty);
649 extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
650 struct tty_struct *tty2);
651 extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
652 struct tty_struct *tty2);
655 * this shall be called only from where BTM is held (like close)
657 * We need this to ensure nobody waits for us to finish while we are waiting.
658 * Without this we were encountering system stalls.
660 * This should be indeed removed with BTM removal later.
662 * Locking: BTM required. Nobody is allowed to hold port->mutex.
664 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
667 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
668 tty_wait_until_sent(tty, timeout);
673 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
675 * The condition we are waiting for might take a long time to
676 * become true, or might depend on another thread taking the
677 * BTM. In either case, we need to drop the BTM to guarantee
678 * forward progress. This is a leftover from the conversion
679 * from the BKL and should eventually get removed as the BTM
682 * Do not use in new code.
684 #define wait_event_interruptible_tty(tty, wq, condition) \
687 if (!(condition)) { \
688 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
693 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
695 DEFINE_WAIT(__wait); \
698 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
701 if (!signal_pending(current)) { \
707 ret = -ERESTARTSYS; \
710 finish_wait(&wq, &__wait); \
713 #ifdef CONFIG_PROC_FS
714 extern void proc_tty_register_driver(struct tty_driver *);
715 extern void proc_tty_unregister_driver(struct tty_driver *);
717 static inline void proc_tty_register_driver(struct tty_driver *d) {}
718 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}