5 * 'tty.h' defines some structures used by tty_io.c and some defines.
10 /* line disciplines */
17 #define N_X25 6 /* X.25 async */
19 #define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
20 #define N_R3964 9 /* Reserved for Simatic R3964 module */
21 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
22 #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
23 #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
24 /* cards about SMS messages */
25 #define N_HDLC 13 /* synchronous HDLC */
26 #define N_SYNC_PPP 14 /* synchronous PPP */
27 #define N_HCI 15 /* Bluetooth HCI UART */
28 #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
29 #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
30 #define N_PPS 18 /* Pulse per Second */
31 #define N_V253 19 /* Codec control over voice modem */
32 #define N_CAIF 20 /* CAIF protocol for talking to modems */
33 #define N_GSM0710 21 /* GSM 0710 Mux */
34 #define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
35 #define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */
36 #define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */
40 #include <linux/major.h>
41 #include <linux/termios.h>
42 #include <linux/workqueue.h>
43 #include <linux/tty_driver.h>
44 #include <linux/tty_ldisc.h>
45 #include <linux/mutex.h>
46 #include <linux/tty_flags.h>
51 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
52 * hardcoded at present.)
54 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
55 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
56 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
59 * This character is the same as _POSIX_VDISABLE: it cannot be used as
60 * a c_cc[] character, but indicates that a particular special character
61 * isn't in use (eg VINTR has no character etc)
63 #define __DISABLED_CHAR '\0'
66 struct tty_buffer
*next
;
68 unsigned char *flag_buf_ptr
;
73 /* Data points here */
74 unsigned long data
[0];
78 * We default to dicing tty buffer allocations to this many characters
79 * in order to avoid multiple page allocations. We know the size of
80 * tty_buffer itself but it must also be taken into account that the
81 * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
82 * logic this must match
85 #define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
89 struct work_struct work
;
91 struct tty_buffer
*head
; /* Queue head */
92 struct tty_buffer
*tail
; /* Active buffer */
93 struct tty_buffer
*free
; /* Free queue head */
94 int memory_used
; /* Buffer space used excluding
98 * When a break, frame error, or parity error happens, these codes are
99 * stuffed into the flags buffer.
105 #define TTY_OVERRUN 4
107 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
108 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
109 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
110 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
111 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
112 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
113 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
114 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
115 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
116 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
117 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
118 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
119 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
120 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
121 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
122 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
123 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
125 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
126 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
127 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
128 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
130 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
131 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
132 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
133 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
134 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
135 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
136 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
137 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
138 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
139 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
140 #define I_IXON(tty) _I_FLAG((tty), IXON)
141 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
142 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
143 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
144 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
146 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
147 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
148 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
149 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
150 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
151 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
152 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
153 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
154 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
155 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
156 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
157 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
158 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
159 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
161 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
162 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
163 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
164 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
165 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
166 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
167 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
168 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
169 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
170 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
172 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
173 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
174 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
175 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
176 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
177 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
178 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
179 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
180 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
181 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
182 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
183 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
184 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
185 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
186 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
187 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
190 struct signal_struct
;
193 * Port level information. Each device keeps its own port level information
194 * so provide a common structure for those ports wanting to use common support
197 * The tty port has a different lifetime to the tty so must be kept apart.
198 * In addition be careful as tty -> port mappings are valid for the life
199 * of the tty object but in many cases port -> tty mappings are valid only
200 * until a hangup so don't use the wrong path.
205 struct tty_port_operations
{
206 /* Return 1 if the carrier is raised */
207 int (*carrier_raised
)(struct tty_port
*port
);
208 /* Control the DTR line */
209 void (*dtr_rts
)(struct tty_port
*port
, int raise
);
210 /* Called when the last close completes or a hangup finishes
211 IFF the port was initialized. Do not use to free resources. Called
212 under the port mutex to serialize against activate/shutdowns */
213 void (*shutdown
)(struct tty_port
*port
);
214 void (*drop
)(struct tty_port
*port
);
215 /* Called under the port mutex from tty_port_open, serialized using
217 /* FIXME: long term getting the tty argument *out* of this would be
219 int (*activate
)(struct tty_port
*port
, struct tty_struct
*tty
);
220 /* Called on the final put of a port */
221 void (*destruct
)(struct tty_port
*port
);
225 struct tty_struct
*tty
; /* Back pointer */
226 const struct tty_port_operations
*ops
; /* Port operations */
227 spinlock_t lock
; /* Lock protecting tty field */
228 int blocked_open
; /* Waiting to open */
229 int count
; /* Usage count */
230 wait_queue_head_t open_wait
; /* Open waiters */
231 wait_queue_head_t close_wait
; /* Close waiters */
232 wait_queue_head_t delta_msr_wait
; /* Modem status change */
233 unsigned long flags
; /* TTY flags ASY_*/
234 unsigned char console
:1; /* port is a console */
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 mutex ldisc_mutex
;
270 struct tty_ldisc
*ldisc
;
272 struct mutex legacy_mutex
;
273 struct mutex termios_mutex
;
274 spinlock_t ctrl_lock
;
275 /* Termios values are protected by the termios mutex */
276 struct ktermios termios
, termios_locked
;
277 struct termiox
*termiox
; /* May be NULL for unsupported */
279 struct pid
*pgrp
; /* Protected by ctrl lock */
283 struct winsize winsize
; /* termios mutex */
284 unsigned char stopped
:1, hw_stopped
:1, flow_stopped
:1, packet
:1;
285 unsigned char low_latency
:1, warned
:1;
286 unsigned char ctrl_status
; /* ctrl_lock */
287 unsigned int receive_room
; /* Bytes free for queue */
289 struct tty_struct
*link
;
290 struct fasync_struct
*fasync
;
291 struct tty_bufhead buf
; /* Locked internally */
292 int alt_speed
; /* For magic substitution of 38400 bps */
293 wait_queue_head_t write_wait
;
294 wait_queue_head_t read_wait
;
295 struct work_struct hangup_work
;
298 struct list_head tty_files
;
300 #define N_TTY_BUF_SIZE 4096
303 * The following is data for the N_TTY line discipline. For
304 * historical reasons, this is included in the tty structure.
305 * Mostly locked by the BKL.
308 unsigned char lnext
:1, erasing
:1, raw
:1, real_raw
:1, icanon
:1;
309 unsigned char closing
:1;
310 unsigned char echo_overrun
:1;
311 unsigned short minimum_to_wake
;
312 unsigned long overrun_time
;
314 unsigned long process_char_map
[256/(8*sizeof(unsigned long))];
319 unsigned long read_flags
[N_TTY_BUF_SIZE
/(8*sizeof(unsigned long))];
320 unsigned char *echo_buf
;
321 unsigned int echo_pos
;
322 unsigned int echo_cnt
;
324 unsigned long canon_head
;
325 unsigned int canon_column
;
326 struct mutex atomic_read_lock
;
327 struct mutex atomic_write_lock
;
328 struct mutex output_lock
;
329 struct mutex echo_lock
;
330 unsigned char *write_buf
;
332 spinlock_t read_lock
;
333 /* If the tty has a pending do_SAK, queue it here - akpm */
334 struct work_struct SAK_work
;
335 struct tty_port
*port
;
338 /* Each of a tty's open files has private_data pointing to tty_file_private */
339 struct tty_file_private
{
340 struct tty_struct
*tty
;
342 struct list_head list
;
345 /* tty magic number */
346 #define TTY_MAGIC 0x5401
349 * These bits are used in the flags field of the tty structure.
351 * So that interrupts won't be able to mess up the queues,
352 * copy_to_cooked must be atomic with respect to itself, as must
353 * tty->write. Thus, you must use the inline functions set_bit() and
354 * clear_bit() to make things atomic.
356 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
357 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
358 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
359 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
360 #define TTY_DEBUG 4 /* Debugging */
361 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
362 #define TTY_PUSH 6 /* n_tty private */
363 #define TTY_CLOSING 7 /* ->close() in progress */
364 #define TTY_LDISC 9 /* Line discipline attached */
365 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
366 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
367 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
368 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
369 #define TTY_PTY_LOCK 16 /* pty private */
370 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
371 #define TTY_HUPPED 18 /* Post driver->hangup() */
372 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
373 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
374 #define TTY_HUPPING 21 /* ->hangup() in progress */
376 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
378 extern void tty_write_flush(struct tty_struct
*);
380 extern struct ktermios tty_std_termios
;
382 extern void console_init(void);
383 extern int vcs_init(void);
385 extern struct class *tty_class
;
388 * tty_kref_get - get a tty reference
391 * Return a new reference to a tty object. The caller must hold
392 * sufficient locks/counts to ensure that their existing reference cannot
396 static inline struct tty_struct
*tty_kref_get(struct tty_struct
*tty
)
399 kref_get(&tty
->kref
);
402 extern void tty_kref_put(struct tty_struct
*tty
);
404 extern int tty_paranoia_check(struct tty_struct
*tty
, struct inode
*inode
,
405 const char *routine
);
406 extern char *tty_name(struct tty_struct
*tty
, char *buf
);
407 extern void tty_wait_until_sent(struct tty_struct
*tty
, long timeout
);
408 extern int tty_check_change(struct tty_struct
*tty
);
409 extern void stop_tty(struct tty_struct
*tty
);
410 extern void start_tty(struct tty_struct
*tty
);
411 extern int tty_register_driver(struct tty_driver
*driver
);
412 extern int tty_unregister_driver(struct tty_driver
*driver
);
413 extern struct device
*tty_register_device(struct tty_driver
*driver
,
414 unsigned index
, struct device
*dev
);
415 extern struct device
*tty_register_device_attr(struct tty_driver
*driver
,
416 unsigned index
, struct device
*device
,
418 const struct attribute_group
**attr_grp
);
419 extern void tty_unregister_device(struct tty_driver
*driver
, unsigned index
);
420 extern int tty_read_raw_data(struct tty_struct
*tty
, unsigned char *bufp
,
422 extern void tty_write_message(struct tty_struct
*tty
, char *msg
);
423 extern int tty_put_char(struct tty_struct
*tty
, unsigned char c
);
424 extern int tty_chars_in_buffer(struct tty_struct
*tty
);
425 extern int tty_write_room(struct tty_struct
*tty
);
426 extern void tty_driver_flush_buffer(struct tty_struct
*tty
);
427 extern void tty_throttle(struct tty_struct
*tty
);
428 extern void tty_unthrottle(struct tty_struct
*tty
);
429 extern int tty_do_resize(struct tty_struct
*tty
, struct winsize
*ws
);
430 extern void tty_driver_remove_tty(struct tty_driver
*driver
,
431 struct tty_struct
*tty
);
432 extern void tty_free_termios(struct tty_struct
*tty
);
433 extern int is_current_pgrp_orphaned(void);
434 extern struct pid
*tty_get_pgrp(struct tty_struct
*tty
);
435 extern int is_ignored(int sig
);
436 extern int tty_signal(int sig
, struct tty_struct
*tty
);
437 extern void tty_hangup(struct tty_struct
*tty
);
438 extern void tty_vhangup(struct tty_struct
*tty
);
439 extern void tty_vhangup_locked(struct tty_struct
*tty
);
440 extern void tty_vhangup_self(void);
441 extern void tty_unhangup(struct file
*filp
);
442 extern int tty_hung_up_p(struct file
*filp
);
443 extern void do_SAK(struct tty_struct
*tty
);
444 extern void __do_SAK(struct tty_struct
*tty
);
445 extern void disassociate_ctty(int priv
);
446 extern void no_tty(void);
447 extern void tty_flip_buffer_push(struct tty_struct
*tty
);
448 extern void tty_flush_to_ldisc(struct tty_struct
*tty
);
449 extern void tty_buffer_free_all(struct tty_struct
*tty
);
450 extern void tty_buffer_flush(struct tty_struct
*tty
);
451 extern void tty_buffer_init(struct tty_struct
*tty
);
452 extern speed_t
tty_get_baud_rate(struct tty_struct
*tty
);
453 extern speed_t
tty_termios_baud_rate(struct ktermios
*termios
);
454 extern speed_t
tty_termios_input_baud_rate(struct ktermios
*termios
);
455 extern void tty_termios_encode_baud_rate(struct ktermios
*termios
,
456 speed_t ibaud
, speed_t obaud
);
457 extern void tty_encode_baud_rate(struct tty_struct
*tty
,
458 speed_t ibaud
, speed_t obaud
);
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 dev_t
tty_devnum(struct tty_struct
*tty
);
477 extern void proc_clear_tty(struct task_struct
*p
);
478 extern struct tty_struct
*get_current_tty(void);
479 extern void tty_default_fops(struct file_operations
*fops
);
480 extern struct tty_struct
*alloc_tty_struct(void);
481 extern int tty_alloc_file(struct file
*file
);
482 extern void tty_add_file(struct tty_struct
*tty
, struct file
*file
);
483 extern void tty_free_file(struct file
*file
);
484 extern void free_tty_struct(struct tty_struct
*tty
);
485 extern void initialize_tty_struct(struct tty_struct
*tty
,
486 struct tty_driver
*driver
, int idx
);
487 extern void deinitialize_tty_struct(struct tty_struct
*tty
);
488 extern struct tty_struct
*tty_init_dev(struct tty_driver
*driver
, int idx
);
489 extern int tty_release(struct inode
*inode
, struct file
*filp
);
490 extern int tty_init_termios(struct tty_struct
*tty
);
491 extern int tty_standard_install(struct tty_driver
*driver
,
492 struct tty_struct
*tty
);
494 extern struct tty_struct
*tty_pair_get_tty(struct tty_struct
*tty
);
495 extern struct tty_struct
*tty_pair_get_pty(struct tty_struct
*tty
);
497 extern struct mutex tty_mutex
;
498 extern spinlock_t tty_files_lock
;
500 extern void tty_write_unlock(struct tty_struct
*tty
);
501 extern int tty_write_lock(struct tty_struct
*tty
, int ndelay
);
502 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
504 extern void tty_port_init(struct tty_port
*port
);
505 extern void tty_port_link_device(struct tty_port
*port
,
506 struct tty_driver
*driver
, unsigned index
);
507 extern struct device
*tty_port_register_device(struct tty_port
*port
,
508 struct tty_driver
*driver
, unsigned index
,
509 struct device
*device
);
510 extern struct device
*tty_port_register_device_attr(struct tty_port
*port
,
511 struct tty_driver
*driver
, unsigned index
,
512 struct device
*device
, void *drvdata
,
513 const struct attribute_group
**attr_grp
);
514 extern int tty_port_alloc_xmit_buf(struct tty_port
*port
);
515 extern void tty_port_free_xmit_buf(struct tty_port
*port
);
516 extern void tty_port_put(struct tty_port
*port
);
518 static inline struct tty_port
*tty_port_get(struct tty_port
*port
)
521 kref_get(&port
->kref
);
525 /* If the cts flow control is enabled, return true. */
526 static inline bool tty_port_cts_enabled(struct tty_port
*port
)
528 return port
->flags
& ASYNC_CTS_FLOW
;
531 extern struct tty_struct
*tty_port_tty_get(struct tty_port
*port
);
532 extern void tty_port_tty_set(struct tty_port
*port
, struct tty_struct
*tty
);
533 extern int tty_port_carrier_raised(struct tty_port
*port
);
534 extern void tty_port_raise_dtr_rts(struct tty_port
*port
);
535 extern void tty_port_lower_dtr_rts(struct tty_port
*port
);
536 extern void tty_port_hangup(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);
561 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
562 extern void tty_ldisc_enable(struct tty_struct
*tty
);
566 extern struct tty_ldisc_ops tty_ldisc_N_TTY
;
567 extern void n_tty_inherit_ops(struct tty_ldisc_ops
*ops
);
571 extern void tty_audit_add_data(struct tty_struct
*tty
, unsigned char *data
,
573 extern void tty_audit_exit(void);
574 extern void tty_audit_fork(struct signal_struct
*sig
);
575 extern void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
);
576 extern void tty_audit_push(struct tty_struct
*tty
);
577 extern int tty_audit_push_task(struct task_struct
*tsk
,
578 kuid_t loginuid
, u32 sessionid
);
580 static inline void tty_audit_add_data(struct tty_struct
*tty
,
581 unsigned char *data
, size_t size
)
584 static inline void tty_audit_tiocsti(struct tty_struct
*tty
, char ch
)
587 static inline void tty_audit_exit(void)
590 static inline void tty_audit_fork(struct signal_struct
*sig
)
593 static inline void tty_audit_push(struct tty_struct
*tty
)
596 static inline int tty_audit_push_task(struct task_struct
*tsk
,
597 kuid_t loginuid
, u32 sessionid
)
604 extern int __init
tty_init(void);
607 extern int n_tty_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
608 unsigned int cmd
, unsigned long arg
);
609 extern long n_tty_compat_ioctl_helper(struct tty_struct
*tty
, struct file
*file
,
610 unsigned int cmd
, unsigned long arg
);
614 extern void serial_console_init(void);
618 extern int pcxe_open(struct tty_struct
*tty
, struct file
*filp
);
622 extern int vt_ioctl(struct tty_struct
*tty
,
623 unsigned int cmd
, unsigned long arg
);
625 extern long vt_compat_ioctl(struct tty_struct
*tty
,
626 unsigned int cmd
, unsigned long arg
);
629 /* functions for preparation of BKL removal */
630 extern void __lockfunc
tty_lock(struct tty_struct
*tty
);
631 extern void __lockfunc
tty_unlock(struct tty_struct
*tty
);
632 extern void __lockfunc
tty_lock_pair(struct tty_struct
*tty
,
633 struct tty_struct
*tty2
);
634 extern void __lockfunc
tty_unlock_pair(struct tty_struct
*tty
,
635 struct tty_struct
*tty2
);
638 * this shall be called only from where BTM is held (like close)
640 * We need this to ensure nobody waits for us to finish while we are waiting.
641 * Without this we were encountering system stalls.
643 * This should be indeed removed with BTM removal later.
645 * Locking: BTM required. Nobody is allowed to hold port->mutex.
647 static inline void tty_wait_until_sent_from_close(struct tty_struct
*tty
,
650 tty_unlock(tty
); /* tty->ops->close holds the BTM, drop it while waiting */
651 tty_wait_until_sent(tty
, timeout
);
656 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
658 * The condition we are waiting for might take a long time to
659 * become true, or might depend on another thread taking the
660 * BTM. In either case, we need to drop the BTM to guarantee
661 * forward progress. This is a leftover from the conversion
662 * from the BKL and should eventually get removed as the BTM
665 * Do not use in new code.
667 #define wait_event_interruptible_tty(tty, wq, condition) \
670 if (!(condition)) { \
671 __wait_event_interruptible_tty(tty, wq, condition, __ret); \
676 #define __wait_event_interruptible_tty(tty, wq, condition, ret) \
678 DEFINE_WAIT(__wait); \
681 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
684 if (!signal_pending(current)) { \
690 ret = -ERESTARTSYS; \
693 finish_wait(&wq, &__wait); \
697 #endif /* __KERNEL__ */