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 * tty_buffer lock - slave ptys can claim nested buffer lock when handling
29 * signal chars. The stable lock order is slave pty, then
39 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
40 * hardcoded at present.)
42 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
43 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
44 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
47 * This character is the same as _POSIX_VDISABLE: it cannot be used as
48 * a c_cc[] character, but indicates that a particular special character
49 * isn't in use (eg VINTR has no character etc)
51 #define __DISABLED_CHAR '\0'
55 struct tty_buffer *next;
56 struct llist_node free;
63 /* Data points here */
64 unsigned long data[0];
67 /* Values for .flags field of tty_buffer */
68 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
70 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
72 return ((unsigned char *)b->data) + ofs;
75 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
77 return (char *)char_buf_ptr(b, ofs) + b->size;
81 struct tty_buffer *head; /* Queue head */
82 struct work_struct work;
85 struct tty_buffer sentinel;
86 struct llist_head free; /* Free queue head */
87 atomic_t mem_used; /* In-use buffers excluding free list */
89 struct tty_buffer *tail; /* Active buffer */
92 * When a break, frame error, or parity error happens, these codes are
93 * stuffed into the flags buffer.
101 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
102 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
103 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
104 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
105 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
106 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
107 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
108 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
109 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
110 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
111 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
112 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
113 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
114 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
115 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
116 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
117 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
119 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
120 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
121 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
122 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
124 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
125 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
126 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
127 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
128 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
129 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
130 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
131 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
132 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
133 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
134 #define I_IXON(tty) _I_FLAG((tty), IXON)
135 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
136 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
137 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
138 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
140 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
141 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
142 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
143 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
144 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
145 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
146 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
147 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
148 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
149 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
150 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
151 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
152 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
153 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
155 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
156 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
157 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
158 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
159 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
160 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
161 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
162 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
163 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
164 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
165 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
167 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
168 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
169 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
170 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
171 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
172 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
173 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
174 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
175 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
176 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
177 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
178 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
179 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
180 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
181 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
182 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
185 struct signal_struct;
188 * Port level information. Each device keeps its own port level information
189 * so provide a common structure for those ports wanting to use common support
192 * The tty port has a different lifetime to the tty so must be kept apart.
193 * In addition be careful as tty -> port mappings are valid for the life
194 * of the tty object but in many cases port -> tty mappings are valid only
195 * until a hangup so don't use the wrong path.
200 struct tty_port_operations {
201 /* Return 1 if the carrier is raised */
202 int (*carrier_raised)(struct tty_port *port);
203 /* Control the DTR line */
204 void (*dtr_rts)(struct tty_port *port, int raise);
205 /* Called when the last close completes or a hangup finishes
206 IFF the port was initialized. Do not use to free resources. Called
207 under the port mutex to serialize against activate/shutdowns */
208 void (*shutdown)(struct tty_port *port);
209 /* Called under the port mutex from tty_port_open, serialized using
211 /* FIXME: long term getting the tty argument *out* of this would be
213 int (*activate)(struct tty_port *port, struct tty_struct *tty);
214 /* Called on the final put of a port */
215 void (*destruct)(struct tty_port *port);
219 struct tty_bufhead buf; /* Locked internally */
220 struct tty_struct *tty; /* Back pointer */
221 struct tty_struct *itty; /* internal back ptr */
222 const struct tty_port_operations *ops; /* Port operations */
223 spinlock_t lock; /* Lock protecting tty field */
224 int blocked_open; /* Waiting to open */
225 int count; /* Usage count */
226 wait_queue_head_t open_wait; /* Open waiters */
227 wait_queue_head_t close_wait; /* Close waiters */
228 wait_queue_head_t delta_msr_wait; /* Modem status change */
229 unsigned long flags; /* TTY flags ASY_*/
230 unsigned char console:1, /* port is a console */
231 low_latency:1; /* optional: tune for latency */
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.
255 struct tty_operations;
261 struct tty_driver *driver;
262 const struct tty_operations *ops;
265 /* Protects ldisc changes: Lock tty not pty */
266 struct ld_semaphore ldisc_sem;
267 struct tty_ldisc *ldisc;
269 struct mutex atomic_write_lock;
270 struct mutex legacy_mutex;
271 struct mutex throttle_mutex;
272 struct rw_semaphore termios_rwsem;
273 struct mutex winsize_mutex;
274 spinlock_t ctrl_lock;
275 spinlock_t flow_lock;
276 /* Termios values are protected by the termios rwsem */
277 struct ktermios termios, termios_locked;
278 struct termiox *termiox; /* May be NULL for unsupported */
280 struct pid *pgrp; /* Protected by ctrl lock */
284 struct winsize winsize; /* winsize_mutex */
285 unsigned long stopped:1, /* flow_lock */
287 unused:BITS_PER_LONG - 2;
289 unsigned long ctrl_status:8, /* ctrl_lock */
291 unused_ctrl:BITS_PER_LONG - 9;
292 unsigned int receive_room; /* Bytes free for queue */
295 struct tty_struct *link;
296 struct fasync_struct *fasync;
297 int alt_speed; /* For magic substitution of 38400 bps */
298 wait_queue_head_t write_wait;
299 wait_queue_head_t read_wait;
300 struct work_struct hangup_work;
303 struct list_head tty_files;
305 #define N_TTY_BUF_SIZE 4096
308 unsigned char *write_buf;
310 /* If the tty has a pending do_SAK, queue it here - akpm */
311 struct work_struct SAK_work;
312 struct tty_port *port;
315 /* Each of a tty's open files has private_data pointing to tty_file_private */
316 struct tty_file_private {
317 struct tty_struct *tty;
319 struct list_head list;
322 /* tty magic number */
323 #define TTY_MAGIC 0x5401
326 * These bits are used in the flags field of the tty structure.
328 * So that interrupts won't be able to mess up the queues,
329 * copy_to_cooked must be atomic with respect to itself, as must
330 * tty->write. Thus, you must use the inline functions set_bit() and
331 * clear_bit() to make things atomic.
333 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
334 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
335 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
336 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
337 #define TTY_DEBUG 4 /* Debugging */
338 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
339 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
340 #define TTY_PTY_LOCK 16 /* pty private */
341 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
342 #define TTY_HUPPED 18 /* Post driver->hangup() */
343 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
345 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
347 /* Values for tty->flow_change */
348 #define TTY_THROTTLE_SAFE 1
349 #define TTY_UNTHROTTLE_SAFE 2
351 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
353 tty->flow_change = val;
356 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
358 tty->flow_change = val;
363 extern void console_init(void);
364 extern void tty_kref_put(struct tty_struct *tty);
365 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
366 extern void tty_vhangup_self(void);
367 extern void disassociate_ctty(int priv);
368 extern dev_t tty_devnum(struct tty_struct *tty);
369 extern void proc_clear_tty(struct task_struct *p);
370 extern struct tty_struct *get_current_tty(void);
372 extern int __init tty_init(void);
374 static inline void console_init(void)
376 static inline void tty_kref_put(struct tty_struct *tty)
378 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
380 static inline void tty_vhangup_self(void)
382 static inline void disassociate_ctty(int priv)
384 static inline dev_t tty_devnum(struct tty_struct *tty)
386 static inline void proc_clear_tty(struct task_struct *p)
388 static inline struct tty_struct *get_current_tty(void)
391 static inline int __init tty_init(void)
395 extern void tty_write_flush(struct tty_struct *);
397 extern struct ktermios tty_std_termios;
399 extern int vcs_init(void);
401 extern struct class *tty_class;
404 * tty_kref_get - get a tty reference
407 * Return a new reference to a tty object. The caller must hold
408 * sufficient locks/counts to ensure that their existing reference cannot
412 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
415 kref_get(&tty->kref);
419 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
420 const char *routine);
421 extern char *tty_name(struct tty_struct *tty, char *buf);
422 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
423 extern int tty_check_change(struct tty_struct *tty);
424 extern void __stop_tty(struct tty_struct *tty);
425 extern void stop_tty(struct tty_struct *tty);
426 extern void __start_tty(struct tty_struct *tty);
427 extern void start_tty(struct tty_struct *tty);
428 extern int tty_register_driver(struct tty_driver *driver);
429 extern int tty_unregister_driver(struct tty_driver *driver);
430 extern struct device *tty_register_device(struct tty_driver *driver,
431 unsigned index, struct device *dev);
432 extern struct device *tty_register_device_attr(struct tty_driver *driver,
433 unsigned index, struct device *device,
435 const struct attribute_group **attr_grp);
436 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
437 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
439 extern void tty_write_message(struct tty_struct *tty, char *msg);
440 extern int tty_send_xchar(struct tty_struct *tty, char ch);
441 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
442 extern int tty_chars_in_buffer(struct tty_struct *tty);
443 extern int tty_write_room(struct tty_struct *tty);
444 extern void tty_driver_flush_buffer(struct tty_struct *tty);
445 extern void tty_throttle(struct tty_struct *tty);
446 extern void tty_unthrottle(struct tty_struct *tty);
447 extern int tty_throttle_safe(struct tty_struct *tty);
448 extern int tty_unthrottle_safe(struct tty_struct *tty);
449 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
450 extern void tty_driver_remove_tty(struct tty_driver *driver,
451 struct tty_struct *tty);
452 extern void tty_free_termios(struct tty_struct *tty);
453 extern int is_current_pgrp_orphaned(void);
454 extern int is_ignored(int sig);
455 extern int tty_signal(int sig, struct tty_struct *tty);
456 extern void tty_hangup(struct tty_struct *tty);
457 extern void tty_vhangup(struct tty_struct *tty);
458 extern int tty_hung_up_p(struct file *filp);
459 extern void do_SAK(struct tty_struct *tty);
460 extern void __do_SAK(struct tty_struct *tty);
461 extern void no_tty(void);
462 extern void tty_flush_to_ldisc(struct tty_struct *tty);
463 extern void tty_buffer_free_all(struct tty_port *port);
464 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
465 extern void tty_buffer_init(struct tty_port *port);
466 extern void tty_buffer_set_lock_subclass(struct tty_port *port);
467 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
468 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
469 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
470 speed_t ibaud, speed_t obaud);
471 extern void tty_encode_baud_rate(struct tty_struct *tty,
472 speed_t ibaud, speed_t obaud);
475 * tty_get_baud_rate - get tty bit rates
478 * Returns the baud rate as an integer for this terminal. The
479 * termios lock must be held by the caller and the terminal bit
480 * flags may be updated.
484 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
486 return tty_termios_baud_rate(&tty->termios);
489 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
490 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
491 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
493 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
494 extern void tty_ldisc_deref(struct tty_ldisc *);
495 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
496 extern void tty_ldisc_hangup(struct tty_struct *tty);
497 extern const struct file_operations tty_ldiscs_proc_fops;
499 extern void tty_wakeup(struct tty_struct *tty);
500 extern void tty_ldisc_flush(struct tty_struct *tty);
502 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
503 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
504 unsigned int cmd, unsigned long arg);
505 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
506 extern void tty_default_fops(struct file_operations *fops);
507 extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
508 extern int tty_alloc_file(struct file *file);
509 extern void tty_add_file(struct tty_struct *tty, struct file *file);
510 extern void tty_free_file(struct file *file);
511 extern void free_tty_struct(struct tty_struct *tty);
512 extern void deinitialize_tty_struct(struct tty_struct *tty);
513 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
514 extern int tty_release(struct inode *inode, struct file *filp);
515 extern int tty_init_termios(struct tty_struct *tty);
516 extern int tty_standard_install(struct tty_driver *driver,
517 struct tty_struct *tty);
519 extern struct mutex tty_mutex;
520 extern spinlock_t tty_files_lock;
522 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
524 extern void tty_port_init(struct tty_port *port);
525 extern void tty_port_link_device(struct tty_port *port,
526 struct tty_driver *driver, unsigned index);
527 extern struct device *tty_port_register_device(struct tty_port *port,
528 struct tty_driver *driver, unsigned index,
529 struct device *device);
530 extern struct device *tty_port_register_device_attr(struct tty_port *port,
531 struct tty_driver *driver, unsigned index,
532 struct device *device, void *drvdata,
533 const struct attribute_group **attr_grp);
534 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
535 extern void tty_port_free_xmit_buf(struct tty_port *port);
536 extern void tty_port_destroy(struct tty_port *port);
537 extern void tty_port_put(struct tty_port *port);
539 static inline struct tty_port *tty_port_get(struct tty_port *port)
541 if (port && kref_get_unless_zero(&port->kref))
546 /* If the cts flow control is enabled, return true. */
547 static inline bool tty_port_cts_enabled(struct tty_port *port)
549 return port->flags & ASYNC_CTS_FLOW;
552 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
553 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
554 extern int tty_port_carrier_raised(struct tty_port *port);
555 extern void tty_port_raise_dtr_rts(struct tty_port *port);
556 extern void tty_port_lower_dtr_rts(struct tty_port *port);
557 extern void tty_port_hangup(struct tty_port *port);
558 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
559 extern void tty_port_tty_wakeup(struct tty_port *port);
560 extern int tty_port_block_til_ready(struct tty_port *port,
561 struct tty_struct *tty, struct file *filp);
562 extern int tty_port_close_start(struct tty_port *port,
563 struct tty_struct *tty, struct file *filp);
564 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
565 extern void tty_port_close(struct tty_port *port,
566 struct tty_struct *tty, struct file *filp);
567 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
568 struct tty_struct *tty);
569 extern int tty_port_open(struct tty_port *port,
570 struct tty_struct *tty, struct file *filp);
571 static inline int tty_port_users(struct tty_port *port)
573 return port->count + port->blocked_open;
576 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
577 extern int tty_unregister_ldisc(int disc);
578 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
579 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
580 extern void tty_ldisc_release(struct tty_struct *tty);
581 extern void tty_ldisc_init(struct tty_struct *tty);
582 extern void tty_ldisc_deinit(struct tty_struct *tty);
583 extern void tty_ldisc_begin(void);
585 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
588 if (ld->ops->receive_buf2)
589 count = ld->ops->receive_buf2(ld->tty, p, f, count);
591 count = min_t(int, count, ld->tty->receive_room);
593 ld->ops->receive_buf(ld->tty, p, f, count);
600 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
601 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
605 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
606 size_t size, unsigned icanon);
607 extern void tty_audit_exit(void);
608 extern void tty_audit_fork(struct signal_struct *sig);
609 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
610 extern void tty_audit_push(struct tty_struct *tty);
611 extern int tty_audit_push_current(void);
613 static inline void tty_audit_add_data(struct tty_struct *tty,
614 unsigned char *data, size_t size, unsigned icanon)
617 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
620 static inline void tty_audit_exit(void)
623 static inline void tty_audit_fork(struct signal_struct *sig)
626 static inline void tty_audit_push(struct tty_struct *tty)
629 static inline int tty_audit_push_current(void)
636 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
637 unsigned int cmd, unsigned long arg);
638 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
639 unsigned int cmd, unsigned long arg);
643 extern int vt_ioctl(struct tty_struct *tty,
644 unsigned int cmd, unsigned long arg);
646 extern long vt_compat_ioctl(struct tty_struct *tty,
647 unsigned int cmd, unsigned long arg);
650 /* functions for preparation of BKL removal */
651 extern void __lockfunc tty_lock(struct tty_struct *tty);
652 extern void __lockfunc tty_unlock(struct tty_struct *tty);
653 extern void __lockfunc tty_lock_slave(struct tty_struct *tty);
654 extern void __lockfunc tty_unlock_slave(struct tty_struct *tty);
655 extern void tty_set_lock_subclass(struct tty_struct *tty);
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) \
690 __ret = __wait_event_interruptible_tty(tty, wq, \
695 #define __wait_event_interruptible_tty(tty, wq, condition) \
696 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
701 #ifdef CONFIG_PROC_FS
702 extern void proc_tty_register_driver(struct tty_driver *);
703 extern void proc_tty_unregister_driver(struct tty_driver *);
705 static inline void proc_tty_register_driver(struct tty_driver *d) {}
706 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}