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>
18 * Lock subclasses for tty locks
20 * TTY_LOCK_NORMAL is for normal ttys and master ptys.
21 * TTY_LOCK_SLAVE is for slave ptys only.
23 * Lock subclasses are necessary for handling nested locking with pty pairs.
24 * tty locks which use nested locking:
26 * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
27 * The stable lock order is master pty first, then slave pty.
28 * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
29 * Subclassing this lock enables the slave pty to hold its
30 * termios_rwsem when claiming the master tty_buffer lock.
31 * tty_buffer lock - slave ptys can claim nested buffer lock when handling
32 * signal chars. The stable lock order is slave pty, then
42 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
43 * hardcoded at present.)
45 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
46 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
47 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
50 * This character is the same as _POSIX_VDISABLE: it cannot be used as
51 * a c_cc[] character, but indicates that a particular special character
52 * isn't in use (eg VINTR has no character etc)
54 #define __DISABLED_CHAR '\0'
58 struct tty_buffer *next;
59 struct llist_node free;
66 /* Data points here */
67 unsigned long data[0];
70 /* Values for .flags field of tty_buffer */
71 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
73 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
75 return ((unsigned char *)b->data) + ofs;
78 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
80 return (char *)char_buf_ptr(b, ofs) + b->size;
84 struct tty_buffer *head; /* Queue head */
85 struct work_struct work;
88 struct tty_buffer sentinel;
89 struct llist_head free; /* Free queue head */
90 atomic_t mem_used; /* In-use buffers excluding free list */
92 struct tty_buffer *tail; /* Active buffer */
95 * When a break, frame error, or parity error happens, these codes are
96 * stuffed into the flags buffer.
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)
168 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
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)
188 struct signal_struct;
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
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.
203 struct 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 /* Called under the port mutex from tty_port_open, serialized using
214 /* FIXME: long term getting the tty argument *out* of this would be
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);
222 struct tty_bufhead buf; /* Locked internally */
223 struct tty_struct *tty; /* Back pointer */
224 struct tty_struct *itty; /* internal back ptr */
225 const struct tty_port_operations *ops; /* Port operations */
226 spinlock_t lock; /* Lock protecting tty field */
227 int blocked_open; /* Waiting to open */
228 int count; /* Usage count */
229 wait_queue_head_t open_wait; /* Open waiters */
230 wait_queue_head_t close_wait; /* Close waiters */
231 wait_queue_head_t delta_msr_wait; /* Modem status change */
232 unsigned long flags; /* TTY flags ASY_*/
233 unsigned char console:1, /* port is a console */
234 low_latency:1; /* optional: tune for latency */
235 struct mutex mutex; /* Locking */
236 struct mutex buf_mutex; /* Buffer alloc lock */
237 unsigned char *xmit_buf; /* Optional buffer */
238 unsigned int close_delay; /* Close port delay */
239 unsigned int closing_wait; /* Delay for output */
240 int drain_delay; /* Set to zero if no pure time
241 based drain is needed else
242 set to size of fifo */
243 struct kref kref; /* Ref counter */
247 * Where all of the state associated with a tty is kept while the tty
248 * is open. Since the termios state should be kept even if the tty
249 * has been closed --- for things like the baud rate, etc --- it is
250 * not stored here, but rather a pointer to the real state is stored
251 * here. Possible the winsize structure should have the same
252 * treatment, but (1) the default 80x24 is usually right and (2) it's
253 * most often used by a windowing system, which will set the correct
254 * size each time the window is created or resized anyway.
258 struct tty_operations;
264 struct tty_driver *driver;
265 const struct tty_operations *ops;
268 /* Protects ldisc changes: Lock tty not pty */
269 struct ld_semaphore ldisc_sem;
270 struct tty_ldisc *ldisc;
272 struct mutex atomic_write_lock;
273 struct mutex legacy_mutex;
274 struct mutex throttle_mutex;
275 struct rw_semaphore termios_rwsem;
276 struct mutex winsize_mutex;
277 spinlock_t ctrl_lock;
278 spinlock_t flow_lock;
279 /* Termios values are protected by the termios rwsem */
280 struct ktermios termios, termios_locked;
281 struct termiox *termiox; /* May be NULL for unsupported */
283 struct pid *pgrp; /* Protected by ctrl lock */
287 struct winsize winsize; /* winsize_mutex */
288 unsigned long stopped:1, /* flow_lock */
290 unused:BITS_PER_LONG - 2;
292 unsigned long ctrl_status:8, /* ctrl_lock */
294 unused_ctrl:BITS_PER_LONG - 9;
295 unsigned int receive_room; /* Bytes free for queue */
298 struct tty_struct *link;
299 struct fasync_struct *fasync;
300 int alt_speed; /* For magic substitution of 38400 bps */
301 wait_queue_head_t write_wait;
302 wait_queue_head_t read_wait;
303 struct work_struct hangup_work;
306 struct list_head tty_files;
308 #define N_TTY_BUF_SIZE 4096
311 unsigned char *write_buf;
313 /* If the tty has a pending do_SAK, queue it here - akpm */
314 struct work_struct SAK_work;
315 struct tty_port *port;
318 /* Each of a tty's open files has private_data pointing to tty_file_private */
319 struct tty_file_private {
320 struct tty_struct *tty;
322 struct list_head list;
325 /* tty magic number */
326 #define TTY_MAGIC 0x5401
329 * These bits are used in the flags field of the tty structure.
331 * So that interrupts won't be able to mess up the queues,
332 * copy_to_cooked must be atomic with respect to itself, as must
333 * tty->write. Thus, you must use the inline functions set_bit() and
334 * clear_bit() to make things atomic.
336 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
337 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
338 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
339 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
340 #define TTY_DEBUG 4 /* Debugging */
341 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
342 #define TTY_OTHER_DONE 6 /* Closed pty has completed input processing */
343 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
344 #define TTY_PTY_LOCK 16 /* pty private */
345 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
346 #define TTY_HUPPED 18 /* Post driver->hangup() */
347 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
349 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
351 /* Values for tty->flow_change */
352 #define TTY_THROTTLE_SAFE 1
353 #define TTY_UNTHROTTLE_SAFE 2
355 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
357 tty->flow_change = val;
360 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
362 tty->flow_change = val;
367 extern void console_init(void);
368 extern void tty_kref_put(struct tty_struct *tty);
369 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
370 extern void tty_vhangup_self(void);
371 extern void disassociate_ctty(int priv);
372 extern dev_t tty_devnum(struct tty_struct *tty);
373 extern void proc_clear_tty(struct task_struct *p);
374 extern struct tty_struct *get_current_tty(void);
376 extern int __init tty_init(void);
378 static inline void console_init(void)
380 static inline void tty_kref_put(struct tty_struct *tty)
382 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
384 static inline void tty_vhangup_self(void)
386 static inline void disassociate_ctty(int priv)
388 static inline dev_t tty_devnum(struct tty_struct *tty)
390 static inline void proc_clear_tty(struct task_struct *p)
392 static inline struct tty_struct *get_current_tty(void)
395 static inline int __init tty_init(void)
399 extern void tty_write_flush(struct tty_struct *);
401 extern struct ktermios tty_std_termios;
403 extern int vcs_init(void);
405 extern struct class *tty_class;
408 * tty_kref_get - get a tty reference
411 * Return a new reference to a tty object. The caller must hold
412 * sufficient locks/counts to ensure that their existing reference cannot
416 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
419 kref_get(&tty->kref);
423 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
424 const char *routine);
425 extern const char *tty_name(const struct tty_struct *tty);
426 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
427 extern int tty_check_change(struct tty_struct *tty);
428 extern void __stop_tty(struct tty_struct *tty);
429 extern void stop_tty(struct tty_struct *tty);
430 extern void __start_tty(struct tty_struct *tty);
431 extern void start_tty(struct tty_struct *tty);
432 extern int tty_register_driver(struct tty_driver *driver);
433 extern int tty_unregister_driver(struct tty_driver *driver);
434 extern struct device *tty_register_device(struct tty_driver *driver,
435 unsigned index, struct device *dev);
436 extern struct device *tty_register_device_attr(struct tty_driver *driver,
437 unsigned index, struct device *device,
439 const struct attribute_group **attr_grp);
440 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
441 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
443 extern void tty_write_message(struct tty_struct *tty, char *msg);
444 extern int tty_send_xchar(struct tty_struct *tty, char ch);
445 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
446 extern int tty_chars_in_buffer(struct tty_struct *tty);
447 extern int tty_write_room(struct tty_struct *tty);
448 extern void tty_driver_flush_buffer(struct tty_struct *tty);
449 extern void tty_throttle(struct tty_struct *tty);
450 extern void tty_unthrottle(struct tty_struct *tty);
451 extern int tty_throttle_safe(struct tty_struct *tty);
452 extern int tty_unthrottle_safe(struct tty_struct *tty);
453 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
454 extern void tty_driver_remove_tty(struct tty_driver *driver,
455 struct tty_struct *tty);
456 extern void tty_free_termios(struct tty_struct *tty);
457 extern int is_current_pgrp_orphaned(void);
458 extern int is_ignored(int sig);
459 extern int tty_signal(int sig, struct tty_struct *tty);
460 extern void tty_hangup(struct tty_struct *tty);
461 extern void tty_vhangup(struct tty_struct *tty);
462 extern int tty_hung_up_p(struct file *filp);
463 extern void do_SAK(struct tty_struct *tty);
464 extern void __do_SAK(struct tty_struct *tty);
465 extern void no_tty(void);
466 extern void tty_buffer_free_all(struct tty_port *port);
467 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
468 extern void tty_buffer_init(struct tty_port *port);
469 extern void tty_buffer_set_lock_subclass(struct tty_port *port);
470 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
471 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
472 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
473 speed_t ibaud, speed_t obaud);
474 extern void tty_encode_baud_rate(struct tty_struct *tty,
475 speed_t ibaud, speed_t obaud);
478 * tty_get_baud_rate - get tty bit rates
481 * Returns the baud rate as an integer for this terminal. The
482 * termios lock must be held by the caller and the terminal bit
483 * flags may be updated.
487 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
489 return tty_termios_baud_rate(&tty->termios);
492 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
493 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
494 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
496 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
497 extern void tty_ldisc_deref(struct tty_ldisc *);
498 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
499 extern void tty_ldisc_hangup(struct tty_struct *tty);
500 extern const struct file_operations tty_ldiscs_proc_fops;
502 extern void tty_wakeup(struct tty_struct *tty);
503 extern void tty_ldisc_flush(struct tty_struct *tty);
505 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
506 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
507 unsigned int cmd, unsigned long arg);
508 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
509 extern void tty_default_fops(struct file_operations *fops);
510 extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
511 extern int tty_alloc_file(struct file *file);
512 extern void tty_add_file(struct tty_struct *tty, struct file *file);
513 extern void tty_free_file(struct file *file);
514 extern void free_tty_struct(struct tty_struct *tty);
515 extern void deinitialize_tty_struct(struct tty_struct *tty);
516 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
517 extern int tty_release(struct inode *inode, struct file *filp);
518 extern int tty_init_termios(struct tty_struct *tty);
519 extern int tty_standard_install(struct tty_driver *driver,
520 struct tty_struct *tty);
522 extern struct mutex tty_mutex;
523 extern spinlock_t tty_files_lock;
525 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
527 extern void tty_port_init(struct tty_port *port);
528 extern void tty_port_link_device(struct tty_port *port,
529 struct tty_driver *driver, unsigned index);
530 extern struct device *tty_port_register_device(struct tty_port *port,
531 struct tty_driver *driver, unsigned index,
532 struct device *device);
533 extern struct device *tty_port_register_device_attr(struct tty_port *port,
534 struct tty_driver *driver, unsigned index,
535 struct device *device, void *drvdata,
536 const struct attribute_group **attr_grp);
537 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
538 extern void tty_port_free_xmit_buf(struct tty_port *port);
539 extern void tty_port_destroy(struct tty_port *port);
540 extern void tty_port_put(struct tty_port *port);
542 static inline struct tty_port *tty_port_get(struct tty_port *port)
544 if (port && kref_get_unless_zero(&port->kref))
549 /* If the cts flow control is enabled, return true. */
550 static inline bool tty_port_cts_enabled(struct tty_port *port)
552 return port->flags & ASYNC_CTS_FLOW;
555 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
556 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
557 extern int tty_port_carrier_raised(struct tty_port *port);
558 extern void tty_port_raise_dtr_rts(struct tty_port *port);
559 extern void tty_port_lower_dtr_rts(struct tty_port *port);
560 extern void tty_port_hangup(struct tty_port *port);
561 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
562 extern void tty_port_tty_wakeup(struct tty_port *port);
563 extern int tty_port_block_til_ready(struct tty_port *port,
564 struct tty_struct *tty, struct file *filp);
565 extern int tty_port_close_start(struct tty_port *port,
566 struct tty_struct *tty, struct file *filp);
567 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
568 extern void tty_port_close(struct tty_port *port,
569 struct tty_struct *tty, struct file *filp);
570 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
571 struct tty_struct *tty);
572 extern int tty_port_open(struct tty_port *port,
573 struct tty_struct *tty, struct file *filp);
574 static inline int tty_port_users(struct tty_port *port)
576 return port->count + port->blocked_open;
579 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
580 extern int tty_unregister_ldisc(int disc);
581 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
582 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
583 extern void tty_ldisc_release(struct tty_struct *tty);
584 extern void tty_ldisc_init(struct tty_struct *tty);
585 extern void tty_ldisc_deinit(struct tty_struct *tty);
586 extern void tty_ldisc_begin(void);
588 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
591 if (ld->ops->receive_buf2)
592 count = ld->ops->receive_buf2(ld->tty, p, f, count);
594 count = min_t(int, count, ld->tty->receive_room);
596 ld->ops->receive_buf(ld->tty, p, f, count);
603 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
604 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
608 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
609 size_t size, unsigned icanon);
610 extern void tty_audit_exit(void);
611 extern void tty_audit_fork(struct signal_struct *sig);
612 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
613 extern void tty_audit_push(struct tty_struct *tty);
614 extern int tty_audit_push_current(void);
616 static inline void tty_audit_add_data(struct tty_struct *tty,
617 unsigned char *data, size_t size, unsigned icanon)
620 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
623 static inline void tty_audit_exit(void)
626 static inline void tty_audit_fork(struct signal_struct *sig)
629 static inline void tty_audit_push(struct tty_struct *tty)
632 static inline int tty_audit_push_current(void)
639 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
640 unsigned int cmd, unsigned long arg);
641 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
642 unsigned int cmd, unsigned long arg);
646 extern int vt_ioctl(struct tty_struct *tty,
647 unsigned int cmd, unsigned long arg);
649 extern long vt_compat_ioctl(struct tty_struct *tty,
650 unsigned int cmd, unsigned long arg);
653 /* functions for preparation of BKL removal */
654 extern void __lockfunc tty_lock(struct tty_struct *tty);
655 extern void __lockfunc tty_unlock(struct tty_struct *tty);
656 extern void __lockfunc tty_lock_slave(struct tty_struct *tty);
657 extern void __lockfunc tty_unlock_slave(struct tty_struct *tty);
658 extern void tty_set_lock_subclass(struct tty_struct *tty);
660 * this shall be called only from where BTM is held (like close)
662 * We need this to ensure nobody waits for us to finish while we are waiting.
663 * Without this we were encountering system stalls.
665 * This should be indeed removed with BTM removal later.
667 * Locking: BTM required. Nobody is allowed to hold port->mutex.
669 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
672 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
673 tty_wait_until_sent(tty, timeout);
678 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
680 * The condition we are waiting for might take a long time to
681 * become true, or might depend on another thread taking the
682 * BTM. In either case, we need to drop the BTM to guarantee
683 * forward progress. This is a leftover from the conversion
684 * from the BKL and should eventually get removed as the BTM
687 * Do not use in new code.
689 #define wait_event_interruptible_tty(tty, wq, condition) \
693 __ret = __wait_event_interruptible_tty(tty, wq, \
698 #define __wait_event_interruptible_tty(tty, wq, condition) \
699 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
704 #ifdef CONFIG_PROC_FS
705 extern void proc_tty_register_driver(struct tty_driver *);
706 extern void proc_tty_unregister_driver(struct tty_driver *);
708 static inline void proc_tty_register_driver(struct tty_driver *d) {}
709 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}