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;
72 struct tty_buffer sentinel;
73 struct llist_head free; /* Free queue head */
74 atomic_t memory_used; /* In-use buffers excluding free list */
75 struct tty_buffer *tail; /* Active buffer */
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 char console:1, /* port is a console */
217 low_latency:1; /* direct buffer flush */
218 struct mutex mutex; /* Locking */
219 struct mutex buf_mutex; /* Buffer alloc lock */
220 unsigned char *xmit_buf; /* Optional buffer */
221 unsigned int close_delay; /* Close port delay */
222 unsigned int closing_wait; /* Delay for output */
223 int drain_delay; /* Set to zero if no pure time
224 based drain is needed else
225 set to size of fifo */
226 struct kref kref; /* Ref counter */
230 * Where all of the state associated with a tty is kept while the tty
231 * is open. Since the termios state should be kept even if the tty
232 * has been closed --- for things like the baud rate, etc --- it is
233 * not stored here, but rather a pointer to the real state is stored
234 * here. Possible the winsize structure should have the same
235 * treatment, but (1) the default 80x24 is usually right and (2) it's
236 * most often used by a windowing system, which will set the correct
237 * size each time the window is created or resized anyway.
241 struct tty_operations;
247 struct tty_driver *driver;
248 const struct tty_operations *ops;
251 /* Protects ldisc changes: Lock tty not pty */
252 struct ld_semaphore ldisc_sem;
253 struct tty_ldisc *ldisc;
255 struct mutex atomic_write_lock;
256 struct mutex legacy_mutex;
257 struct mutex throttle_mutex;
258 struct rw_semaphore termios_rwsem;
259 spinlock_t ctrl_lock;
260 /* Termios values are protected by the termios rwsem */
261 struct ktermios termios, termios_locked;
262 struct termiox *termiox; /* May be NULL for unsupported */
264 struct pid *pgrp; /* Protected by ctrl lock */
268 struct winsize winsize; /* termios rwsem */
269 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
270 unsigned char ctrl_status; /* ctrl_lock */
271 unsigned int receive_room; /* Bytes free for queue */
274 struct tty_struct *link;
275 struct fasync_struct *fasync;
276 int alt_speed; /* For magic substitution of 38400 bps */
277 wait_queue_head_t write_wait;
278 wait_queue_head_t read_wait;
279 struct work_struct hangup_work;
282 struct list_head tty_files;
284 #define N_TTY_BUF_SIZE 4096
286 unsigned char closing:1;
287 unsigned char *write_buf;
289 /* If the tty has a pending do_SAK, queue it here - akpm */
290 struct work_struct SAK_work;
291 struct tty_port *port;
294 /* Each of a tty's open files has private_data pointing to tty_file_private */
295 struct tty_file_private {
296 struct tty_struct *tty;
298 struct list_head list;
301 /* tty magic number */
302 #define TTY_MAGIC 0x5401
305 * These bits are used in the flags field of the tty structure.
307 * So that interrupts won't be able to mess up the queues,
308 * copy_to_cooked must be atomic with respect to itself, as must
309 * tty->write. Thus, you must use the inline functions set_bit() and
310 * clear_bit() to make things atomic.
312 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
313 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
314 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
315 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
316 #define TTY_DEBUG 4 /* Debugging */
317 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
318 #define TTY_PUSH 6 /* n_tty private */
319 #define TTY_CLOSING 7 /* ->close() in progress */
320 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
321 #define TTY_PTY_LOCK 16 /* pty private */
322 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
323 #define TTY_HUPPED 18 /* Post driver->hangup() */
324 #define TTY_HUPPING 21 /* ->hangup() in progress */
325 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
327 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
329 /* Values for tty->flow_change */
330 #define TTY_THROTTLE_SAFE 1
331 #define TTY_UNTHROTTLE_SAFE 2
333 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
335 tty->flow_change = val;
338 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
340 tty->flow_change = val;
345 extern void console_init(void);
346 extern void tty_kref_put(struct tty_struct *tty);
347 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
348 extern void tty_vhangup_self(void);
349 extern void disassociate_ctty(int priv);
350 extern dev_t tty_devnum(struct tty_struct *tty);
351 extern void proc_clear_tty(struct task_struct *p);
352 extern struct tty_struct *get_current_tty(void);
354 extern int __init tty_init(void);
356 static inline void console_init(void)
358 static inline void tty_kref_put(struct tty_struct *tty)
360 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
362 static inline void tty_vhangup_self(void)
364 static inline void disassociate_ctty(int priv)
366 static inline dev_t tty_devnum(struct tty_struct *tty)
368 static inline void proc_clear_tty(struct task_struct *p)
370 static inline struct tty_struct *get_current_tty(void)
373 static inline int __init tty_init(void)
377 extern void tty_write_flush(struct tty_struct *);
379 extern struct ktermios tty_std_termios;
381 extern int vcs_init(void);
383 extern struct class *tty_class;
386 * tty_kref_get - get a tty reference
389 * Return a new reference to a tty object. The caller must hold
390 * sufficient locks/counts to ensure that their existing reference cannot
394 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
397 kref_get(&tty->kref);
401 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
402 const char *routine);
403 extern char *tty_name(struct tty_struct *tty, char *buf);
404 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
405 extern int tty_check_change(struct tty_struct *tty);
406 extern void stop_tty(struct tty_struct *tty);
407 extern void start_tty(struct tty_struct *tty);
408 extern int tty_register_driver(struct tty_driver *driver);
409 extern int tty_unregister_driver(struct tty_driver *driver);
410 extern struct device *tty_register_device(struct tty_driver *driver,
411 unsigned index, struct device *dev);
412 extern struct device *tty_register_device_attr(struct tty_driver *driver,
413 unsigned index, struct device *device,
415 const struct attribute_group **attr_grp);
416 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
417 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
419 extern void tty_write_message(struct tty_struct *tty, char *msg);
420 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
421 extern int tty_chars_in_buffer(struct tty_struct *tty);
422 extern int tty_write_room(struct tty_struct *tty);
423 extern void tty_driver_flush_buffer(struct tty_struct *tty);
424 extern void tty_throttle(struct tty_struct *tty);
425 extern void tty_unthrottle(struct tty_struct *tty);
426 extern int tty_throttle_safe(struct tty_struct *tty);
427 extern int tty_unthrottle_safe(struct tty_struct *tty);
428 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
429 extern void tty_driver_remove_tty(struct tty_driver *driver,
430 struct tty_struct *tty);
431 extern void tty_free_termios(struct tty_struct *tty);
432 extern int is_current_pgrp_orphaned(void);
433 extern int is_ignored(int sig);
434 extern int tty_signal(int sig, struct tty_struct *tty);
435 extern void tty_hangup(struct tty_struct *tty);
436 extern void tty_vhangup(struct tty_struct *tty);
437 extern void tty_vhangup_locked(struct tty_struct *tty);
438 extern void tty_unhangup(struct file *filp);
439 extern int tty_hung_up_p(struct file *filp);
440 extern void do_SAK(struct tty_struct *tty);
441 extern void __do_SAK(struct tty_struct *tty);
442 extern void no_tty(void);
443 extern void tty_flush_to_ldisc(struct tty_struct *tty);
444 extern void tty_buffer_free_all(struct tty_port *port);
445 extern void tty_buffer_flush(struct tty_struct *tty);
446 extern void tty_buffer_init(struct tty_port *port);
447 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
448 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
449 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
450 speed_t ibaud, speed_t obaud);
451 extern void tty_encode_baud_rate(struct tty_struct *tty,
452 speed_t ibaud, speed_t obaud);
455 * tty_get_baud_rate - get tty bit rates
458 * Returns the baud rate as an integer for this terminal. The
459 * termios lock must be held by the caller and the terminal bit
460 * flags may be updated.
464 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
466 return tty_termios_baud_rate(&tty->termios);
469 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
470 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
471 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
473 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
474 extern void tty_ldisc_deref(struct tty_ldisc *);
475 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
476 extern void tty_ldisc_hangup(struct tty_struct *tty);
477 extern const struct file_operations tty_ldiscs_proc_fops;
479 extern void tty_wakeup(struct tty_struct *tty);
480 extern void tty_ldisc_flush(struct tty_struct *tty);
482 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
483 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
484 unsigned int cmd, unsigned long arg);
485 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
486 extern void tty_default_fops(struct file_operations *fops);
487 extern struct tty_struct *alloc_tty_struct(void);
488 extern int tty_alloc_file(struct file *file);
489 extern void tty_add_file(struct tty_struct *tty, struct file *file);
490 extern void tty_free_file(struct file *file);
491 extern void free_tty_struct(struct tty_struct *tty);
492 extern void initialize_tty_struct(struct tty_struct *tty,
493 struct tty_driver *driver, int idx);
494 extern void deinitialize_tty_struct(struct tty_struct *tty);
495 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
496 extern int tty_release(struct inode *inode, struct file *filp);
497 extern int tty_init_termios(struct tty_struct *tty);
498 extern int tty_standard_install(struct tty_driver *driver,
499 struct tty_struct *tty);
501 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
502 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
504 extern struct mutex tty_mutex;
505 extern spinlock_t tty_files_lock;
507 extern void tty_write_unlock(struct tty_struct *tty);
508 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
509 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
511 extern void tty_port_init(struct tty_port *port);
512 extern void tty_port_link_device(struct tty_port *port,
513 struct tty_driver *driver, unsigned index);
514 extern struct device *tty_port_register_device(struct tty_port *port,
515 struct tty_driver *driver, unsigned index,
516 struct device *device);
517 extern struct device *tty_port_register_device_attr(struct tty_port *port,
518 struct tty_driver *driver, unsigned index,
519 struct device *device, void *drvdata,
520 const struct attribute_group **attr_grp);
521 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
522 extern void tty_port_free_xmit_buf(struct tty_port *port);
523 extern void tty_port_destroy(struct tty_port *port);
524 extern void tty_port_put(struct tty_port *port);
526 static inline struct tty_port *tty_port_get(struct tty_port *port)
529 kref_get(&port->kref);
533 /* If the cts flow control is enabled, return true. */
534 static inline bool tty_port_cts_enabled(struct tty_port *port)
536 return port->flags & ASYNC_CTS_FLOW;
539 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
540 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
541 extern int tty_port_carrier_raised(struct tty_port *port);
542 extern void tty_port_raise_dtr_rts(struct tty_port *port);
543 extern void tty_port_lower_dtr_rts(struct tty_port *port);
544 extern void tty_port_hangup(struct tty_port *port);
545 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
546 extern void tty_port_tty_wakeup(struct tty_port *port);
547 extern int tty_port_block_til_ready(struct tty_port *port,
548 struct tty_struct *tty, struct file *filp);
549 extern int tty_port_close_start(struct tty_port *port,
550 struct tty_struct *tty, struct file *filp);
551 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
552 extern void tty_port_close(struct tty_port *port,
553 struct tty_struct *tty, struct file *filp);
554 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
555 struct tty_struct *tty);
556 extern int tty_port_open(struct tty_port *port,
557 struct tty_struct *tty, struct file *filp);
558 static inline int tty_port_users(struct tty_port *port)
560 return port->count + port->blocked_open;
563 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
564 extern int tty_unregister_ldisc(int disc);
565 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
566 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
567 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
568 extern void tty_ldisc_init(struct tty_struct *tty);
569 extern void tty_ldisc_deinit(struct tty_struct *tty);
570 extern void tty_ldisc_begin(void);
572 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
575 if (ld->ops->receive_buf2)
576 count = ld->ops->receive_buf2(ld->tty, p, f, count);
578 count = min_t(int, count, ld->tty->receive_room);
580 ld->ops->receive_buf(ld->tty, p, f, count);
587 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
588 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
592 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
593 size_t size, unsigned icanon);
594 extern void tty_audit_exit(void);
595 extern void tty_audit_fork(struct signal_struct *sig);
596 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
597 extern void tty_audit_push(struct tty_struct *tty);
598 extern int tty_audit_push_current(void);
600 static inline void tty_audit_add_data(struct tty_struct *tty,
601 unsigned char *data, size_t size, unsigned icanon)
604 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
607 static inline void tty_audit_exit(void)
610 static inline void tty_audit_fork(struct signal_struct *sig)
613 static inline void tty_audit_push(struct tty_struct *tty)
616 static inline int tty_audit_push_current(void)
623 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
624 unsigned int cmd, unsigned long arg);
625 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
626 unsigned int cmd, unsigned long arg);
630 extern void serial_console_init(void);
634 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
638 extern int vt_ioctl(struct tty_struct *tty,
639 unsigned int cmd, unsigned long arg);
641 extern long vt_compat_ioctl(struct tty_struct *tty,
642 unsigned int cmd, unsigned long arg);
645 /* functions for preparation of BKL removal */
646 extern void __lockfunc tty_lock(struct tty_struct *tty);
647 extern void __lockfunc tty_unlock(struct tty_struct *tty);
648 extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
649 struct tty_struct *tty2);
650 extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
651 struct tty_struct *tty2);
654 * this shall be called only from where BTM is held (like close)
656 * We need this to ensure nobody waits for us to finish while we are waiting.
657 * Without this we were encountering system stalls.
659 * This should be indeed removed with BTM removal later.
661 * Locking: BTM required. Nobody is allowed to hold port->mutex.
663 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
666 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
667 tty_wait_until_sent(tty, timeout);
672 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
674 * The condition we are waiting for might take a long time to
675 * become true, or might depend on another thread taking the
676 * BTM. In either case, we need to drop the BTM to guarantee
677 * forward progress. This is a leftover from the conversion
678 * from the BKL and should eventually get removed as the BTM
681 * Do not use in new code.
683 #define wait_event_interruptible_tty(tty, wq, condition) \
686 if (!(condition)) { \
687 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
692 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
694 DEFINE_WAIT(__wait); \
697 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
700 if (!signal_pending(current)) { \
706 ret = -ERESTARTSYS; \
709 finish_wait(&wq, &__wait); \
712 #ifdef CONFIG_PROC_FS
713 extern void proc_tty_register_driver(struct tty_driver *);
714 extern void proc_tty_unregister_driver(struct tty_driver *);
716 static inline void proc_tty_register_driver(struct tty_driver *d) {}
717 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}