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>
18 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
19 * hardcoded at present.)
21 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
22 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
23 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
26 * This character is the same as _POSIX_VDISABLE: it cannot be used as
27 * a c_cc[] character, but indicates that a particular special character
28 * isn't in use (eg VINTR has no character etc)
30 #define __DISABLED_CHAR '\0'
33 struct tty_buffer *next;
35 unsigned char *flag_buf_ptr;
40 /* Data points here */
41 unsigned long data[0];
45 * We default to dicing tty buffer allocations to this many characters
46 * in order to avoid multiple page allocations. We know the size of
47 * tty_buffer itself but it must also be taken into account that the
48 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
49 * logic this must match
52 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
56 struct work_struct work;
58 struct tty_buffer *head; /* Queue head */
59 struct tty_buffer *tail; /* Active buffer */
60 struct tty_buffer *free; /* Free queue head */
61 int memory_used; /* Buffer space used excluding
65 * When a break, frame error, or parity error happens, these codes are
66 * stuffed into the flags buffer.
74 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
75 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
76 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
77 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
78 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
79 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
80 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
81 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
82 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
83 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
84 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
85 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
86 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
87 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
88 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
89 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
90 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
92 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
93 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
94 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
95 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
97 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
98 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
99 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
100 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
101 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
102 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
103 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
104 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
105 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
106 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
107 #define I_IXON(tty) _I_FLAG((tty), IXON)
108 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
109 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
110 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
111 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
113 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
114 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
115 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
116 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
117 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
118 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
119 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
120 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
121 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
122 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
123 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
124 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
125 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
126 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
128 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
129 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
130 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
131 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
132 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
133 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
134 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
135 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
136 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
137 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
139 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
140 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
141 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
142 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
143 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
144 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
145 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
146 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
147 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
148 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
149 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
150 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
151 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
152 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
153 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
154 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
157 struct signal_struct;
160 * Port level information. Each device keeps its own port level information
161 * so provide a common structure for those ports wanting to use common support
164 * The tty port has a different lifetime to the tty so must be kept apart.
165 * In addition be careful as tty -> port mappings are valid for the life
166 * of the tty object but in many cases port -> tty mappings are valid only
167 * until a hangup so don't use the wrong path.
172 struct tty_port_operations {
173 /* Return 1 if the carrier is raised */
174 int (*carrier_raised)(struct tty_port *port);
175 /* Control the DTR line */
176 void (*dtr_rts)(struct tty_port *port, int raise);
177 /* Called when the last close completes or a hangup finishes
178 IFF the port was initialized. Do not use to free resources. Called
179 under the port mutex to serialize against activate/shutdowns */
180 void (*shutdown)(struct tty_port *port);
181 void (*drop)(struct tty_port *port);
182 /* Called under the port mutex from tty_port_open, serialized using
184 /* FIXME: long term getting the tty argument *out* of this would be
186 int (*activate)(struct tty_port *port, struct tty_struct *tty);
187 /* Called on the final put of a port */
188 void (*destruct)(struct tty_port *port);
192 struct tty_bufhead buf; /* Locked internally */
193 struct tty_struct *tty; /* Back pointer */
194 struct tty_struct *itty; /* internal back ptr */
195 const struct tty_port_operations *ops; /* Port operations */
196 spinlock_t lock; /* Lock protecting tty field */
197 int blocked_open; /* Waiting to open */
198 int count; /* Usage count */
199 wait_queue_head_t open_wait; /* Open waiters */
200 wait_queue_head_t close_wait; /* Close waiters */
201 wait_queue_head_t delta_msr_wait; /* Modem status change */
202 unsigned long flags; /* TTY flags ASY_*/
203 unsigned long iflags; /* TTYP_ internal flags */
204 #define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
205 #define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
206 unsigned char console:1, /* port is a console */
207 low_latency:1; /* direct buffer flush */
208 struct mutex mutex; /* Locking */
209 struct mutex buf_mutex; /* Buffer alloc lock */
210 unsigned char *xmit_buf; /* Optional buffer */
211 unsigned int close_delay; /* Close port delay */
212 unsigned int closing_wait; /* Delay for output */
213 int drain_delay; /* Set to zero if no pure time
214 based drain is needed else
215 set to size of fifo */
216 struct kref kref; /* Ref counter */
220 * Where all of the state associated with a tty is kept while the tty
221 * is open. Since the termios state should be kept even if the tty
222 * has been closed --- for things like the baud rate, etc --- it is
223 * not stored here, but rather a pointer to the real state is stored
224 * here. Possible the winsize structure should have the same
225 * treatment, but (1) the default 80x24 is usually right and (2) it's
226 * most often used by a windowing system, which will set the correct
227 * size each time the window is created or resized anyway.
231 struct tty_operations;
237 struct tty_driver *driver;
238 const struct tty_operations *ops;
241 /* Protects ldisc changes: Lock tty not pty */
242 struct ld_semaphore ldisc_sem;
243 struct tty_ldisc *ldisc;
245 struct mutex atomic_write_lock;
246 struct mutex legacy_mutex;
247 struct mutex throttle_mutex;
248 struct rw_semaphore termios_rwsem;
249 spinlock_t ctrl_lock;
250 /* Termios values are protected by the termios rwsem */
251 struct ktermios termios, termios_locked;
252 struct termiox *termiox; /* May be NULL for unsupported */
254 struct pid *pgrp; /* Protected by ctrl lock */
258 struct winsize winsize; /* termios rwsem */
259 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
260 unsigned char ctrl_status; /* ctrl_lock */
261 unsigned int receive_room; /* Bytes free for queue */
264 struct tty_struct *link;
265 struct fasync_struct *fasync;
266 int alt_speed; /* For magic substitution of 38400 bps */
267 wait_queue_head_t write_wait;
268 wait_queue_head_t read_wait;
269 struct work_struct hangup_work;
272 struct list_head tty_files;
274 #define N_TTY_BUF_SIZE 4096
276 unsigned char closing:1;
277 unsigned char *write_buf;
279 /* If the tty has a pending do_SAK, queue it here - akpm */
280 struct work_struct SAK_work;
281 struct tty_port *port;
284 /* Each of a tty's open files has private_data pointing to tty_file_private */
285 struct tty_file_private {
286 struct tty_struct *tty;
288 struct list_head list;
291 /* tty magic number */
292 #define TTY_MAGIC 0x5401
295 * These bits are used in the flags field of the tty structure.
297 * So that interrupts won't be able to mess up the queues,
298 * copy_to_cooked must be atomic with respect to itself, as must
299 * tty->write. Thus, you must use the inline functions set_bit() and
300 * clear_bit() to make things atomic.
302 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
303 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
304 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
305 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
306 #define TTY_DEBUG 4 /* Debugging */
307 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
308 #define TTY_PUSH 6 /* n_tty private */
309 #define TTY_CLOSING 7 /* ->close() in progress */
310 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
311 #define TTY_PTY_LOCK 16 /* pty private */
312 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
313 #define TTY_HUPPED 18 /* Post driver->hangup() */
314 #define TTY_HUPPING 21 /* ->hangup() in progress */
315 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
317 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
319 /* Values for tty->flow_change */
320 #define TTY_THROTTLE_SAFE 1
321 #define TTY_UNTHROTTLE_SAFE 2
323 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
325 tty->flow_change = val;
328 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
330 tty->flow_change = val;
335 extern void console_init(void);
336 extern void tty_kref_put(struct tty_struct *tty);
337 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
338 extern void tty_vhangup_self(void);
339 extern void disassociate_ctty(int priv);
340 extern dev_t tty_devnum(struct tty_struct *tty);
341 extern void proc_clear_tty(struct task_struct *p);
342 extern struct tty_struct *get_current_tty(void);
344 extern int __init tty_init(void);
346 static inline void console_init(void)
348 static inline void tty_kref_put(struct tty_struct *tty)
350 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
352 static inline void tty_vhangup_self(void)
354 static inline void disassociate_ctty(int priv)
356 static inline dev_t tty_devnum(struct tty_struct *tty)
358 static inline void proc_clear_tty(struct task_struct *p)
360 static inline struct tty_struct *get_current_tty(void)
363 static inline int __init tty_init(void)
367 extern void tty_write_flush(struct tty_struct *);
369 extern struct ktermios tty_std_termios;
371 extern int vcs_init(void);
373 extern struct class *tty_class;
376 * tty_kref_get - get a tty reference
379 * Return a new reference to a tty object. The caller must hold
380 * sufficient locks/counts to ensure that their existing reference cannot
384 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
387 kref_get(&tty->kref);
391 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
392 const char *routine);
393 extern char *tty_name(struct tty_struct *tty, char *buf);
394 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
395 extern int tty_check_change(struct tty_struct *tty);
396 extern void stop_tty(struct tty_struct *tty);
397 extern void start_tty(struct tty_struct *tty);
398 extern int tty_register_driver(struct tty_driver *driver);
399 extern int tty_unregister_driver(struct tty_driver *driver);
400 extern struct device *tty_register_device(struct tty_driver *driver,
401 unsigned index, struct device *dev);
402 extern struct device *tty_register_device_attr(struct tty_driver *driver,
403 unsigned index, struct device *device,
405 const struct attribute_group **attr_grp);
406 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
407 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
409 extern void tty_write_message(struct tty_struct *tty, char *msg);
410 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
411 extern int tty_chars_in_buffer(struct tty_struct *tty);
412 extern int tty_write_room(struct tty_struct *tty);
413 extern void tty_driver_flush_buffer(struct tty_struct *tty);
414 extern void tty_throttle(struct tty_struct *tty);
415 extern void tty_unthrottle(struct tty_struct *tty);
416 extern int tty_throttle_safe(struct tty_struct *tty);
417 extern int tty_unthrottle_safe(struct tty_struct *tty);
418 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
419 extern void tty_driver_remove_tty(struct tty_driver *driver,
420 struct tty_struct *tty);
421 extern void tty_free_termios(struct tty_struct *tty);
422 extern int is_current_pgrp_orphaned(void);
423 extern int is_ignored(int sig);
424 extern int tty_signal(int sig, struct tty_struct *tty);
425 extern void tty_hangup(struct tty_struct *tty);
426 extern void tty_vhangup(struct tty_struct *tty);
427 extern void tty_vhangup_locked(struct tty_struct *tty);
428 extern void tty_unhangup(struct file *filp);
429 extern int tty_hung_up_p(struct file *filp);
430 extern void do_SAK(struct tty_struct *tty);
431 extern void __do_SAK(struct tty_struct *tty);
432 extern void no_tty(void);
433 extern void tty_flush_to_ldisc(struct tty_struct *tty);
434 extern void tty_buffer_free_all(struct tty_port *port);
435 extern void tty_buffer_flush(struct tty_struct *tty);
436 extern void tty_buffer_init(struct tty_port *port);
437 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
438 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
439 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
440 speed_t ibaud, speed_t obaud);
441 extern void tty_encode_baud_rate(struct tty_struct *tty,
442 speed_t ibaud, speed_t obaud);
445 * tty_get_baud_rate - get tty bit rates
448 * Returns the baud rate as an integer for this terminal. The
449 * termios lock must be held by the caller and the terminal bit
450 * flags may be updated.
454 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
456 return tty_termios_baud_rate(&tty->termios);
459 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
460 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
461 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
463 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
464 extern void tty_ldisc_deref(struct tty_ldisc *);
465 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
466 extern void tty_ldisc_hangup(struct tty_struct *tty);
467 extern const struct file_operations tty_ldiscs_proc_fops;
469 extern void tty_wakeup(struct tty_struct *tty);
470 extern void tty_ldisc_flush(struct tty_struct *tty);
472 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
473 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
474 unsigned int cmd, unsigned long arg);
475 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
476 extern void tty_default_fops(struct file_operations *fops);
477 extern struct tty_struct *alloc_tty_struct(void);
478 extern int tty_alloc_file(struct file *file);
479 extern void tty_add_file(struct tty_struct *tty, struct file *file);
480 extern void tty_free_file(struct file *file);
481 extern void free_tty_struct(struct tty_struct *tty);
482 extern void initialize_tty_struct(struct tty_struct *tty,
483 struct tty_driver *driver, int idx);
484 extern void deinitialize_tty_struct(struct tty_struct *tty);
485 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
486 extern int tty_release(struct inode *inode, struct file *filp);
487 extern int tty_init_termios(struct tty_struct *tty);
488 extern int tty_standard_install(struct tty_driver *driver,
489 struct tty_struct *tty);
491 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
492 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
494 extern struct mutex tty_mutex;
495 extern spinlock_t tty_files_lock;
497 extern void tty_write_unlock(struct tty_struct *tty);
498 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
499 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
501 extern void tty_port_init(struct tty_port *port);
502 extern void tty_port_link_device(struct tty_port *port,
503 struct tty_driver *driver, unsigned index);
504 extern struct device *tty_port_register_device(struct tty_port *port,
505 struct tty_driver *driver, unsigned index,
506 struct device *device);
507 extern struct device *tty_port_register_device_attr(struct tty_port *port,
508 struct tty_driver *driver, unsigned index,
509 struct device *device, void *drvdata,
510 const struct attribute_group **attr_grp);
511 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
512 extern void tty_port_free_xmit_buf(struct tty_port *port);
513 extern void tty_port_destroy(struct tty_port *port);
514 extern void tty_port_put(struct tty_port *port);
516 static inline struct tty_port *tty_port_get(struct tty_port *port)
519 kref_get(&port->kref);
523 /* If the cts flow control is enabled, return true. */
524 static inline bool tty_port_cts_enabled(struct tty_port *port)
526 return port->flags & ASYNC_CTS_FLOW;
529 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
530 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
531 extern int tty_port_carrier_raised(struct tty_port *port);
532 extern void tty_port_raise_dtr_rts(struct tty_port *port);
533 extern void tty_port_lower_dtr_rts(struct tty_port *port);
534 extern void tty_port_hangup(struct tty_port *port);
535 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
536 extern void tty_port_tty_wakeup(struct tty_port *port);
537 extern int tty_port_block_til_ready(struct tty_port *port,
538 struct tty_struct *tty, struct file *filp);
539 extern int tty_port_close_start(struct tty_port *port,
540 struct tty_struct *tty, struct file *filp);
541 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
542 extern void tty_port_close(struct tty_port *port,
543 struct tty_struct *tty, struct file *filp);
544 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
545 struct tty_struct *tty);
546 extern int tty_port_open(struct tty_port *port,
547 struct tty_struct *tty, struct file *filp);
548 static inline int tty_port_users(struct tty_port *port)
550 return port->count + port->blocked_open;
553 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
554 extern int tty_unregister_ldisc(int disc);
555 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
556 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
557 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
558 extern void tty_ldisc_init(struct tty_struct *tty);
559 extern void tty_ldisc_deinit(struct tty_struct *tty);
560 extern void tty_ldisc_begin(void);
562 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
565 if (ld->ops->receive_buf2)
566 count = ld->ops->receive_buf2(ld->tty, p, f, count);
568 count = min_t(int, count, ld->tty->receive_room);
570 ld->ops->receive_buf(ld->tty, p, f, count);
577 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
578 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
582 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
583 size_t size, unsigned icanon);
584 extern void tty_audit_exit(void);
585 extern void tty_audit_fork(struct signal_struct *sig);
586 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
587 extern void tty_audit_push(struct tty_struct *tty);
588 extern int tty_audit_push_current(void);
590 static inline void tty_audit_add_data(struct tty_struct *tty,
591 unsigned char *data, size_t size, unsigned icanon)
594 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
597 static inline void tty_audit_exit(void)
600 static inline void tty_audit_fork(struct signal_struct *sig)
603 static inline void tty_audit_push(struct tty_struct *tty)
606 static inline int tty_audit_push_current(void)
613 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
614 unsigned int cmd, unsigned long arg);
615 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
616 unsigned int cmd, unsigned long arg);
620 extern void serial_console_init(void);
624 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
628 extern int vt_ioctl(struct tty_struct *tty,
629 unsigned int cmd, unsigned long arg);
631 extern long vt_compat_ioctl(struct tty_struct *tty,
632 unsigned int cmd, unsigned long arg);
635 /* functions for preparation of BKL removal */
636 extern void __lockfunc tty_lock(struct tty_struct *tty);
637 extern void __lockfunc tty_unlock(struct tty_struct *tty);
638 extern void __lockfunc tty_lock_pair(struct tty_struct *tty,
639 struct tty_struct *tty2);
640 extern void __lockfunc tty_unlock_pair(struct tty_struct *tty,
641 struct tty_struct *tty2);
644 * this shall be called only from where BTM is held (like close)
646 * We need this to ensure nobody waits for us to finish while we are waiting.
647 * Without this we were encountering system stalls.
649 * This should be indeed removed with BTM removal later.
651 * Locking: BTM required. Nobody is allowed to hold port->mutex.
653 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
656 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
657 tty_wait_until_sent(tty, timeout);
662 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
664 * The condition we are waiting for might take a long time to
665 * become true, or might depend on another thread taking the
666 * BTM. In either case, we need to drop the BTM to guarantee
667 * forward progress. This is a leftover from the conversion
668 * from the BKL and should eventually get removed as the BTM
671 * Do not use in new code.
673 #define wait_event_interruptible_tty(tty, wq, condition) \
676 if (!(condition)) { \
677 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
682 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
684 DEFINE_WAIT(__wait); \
687 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
690 if (!signal_pending(current)) { \
696 ret = -ERESTARTSYS; \
699 finish_wait(&wq, &__wait); \
702 #ifdef CONFIG_PROC_FS
703 extern void proc_tty_register_driver(struct tty_driver *);
704 extern void proc_tty_unregister_driver(struct tty_driver *);
706 static inline void proc_tty_register_driver(struct tty_driver *d) {}
707 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}