1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/major.h>
7 #include <linux/termios.h>
8 #include <linux/workqueue.h>
9 #include <linux/tty_driver.h>
10 #include <linux/tty_ldisc.h>
11 #include <linux/mutex.h>
12 #include <linux/tty_flags.h>
13 #include <linux/seq_file.h>
14 #include <uapi/linux/tty.h>
15 #include <linux/rwsem.h>
16 #include <linux/llist.h>
20 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
21 * hardcoded at present.)
23 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
24 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
25 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
28 * This character is the same as _POSIX_VDISABLE: it cannot be used as
29 * a c_cc[] character, but indicates that a particular special character
30 * isn't in use (eg VINTR has no character etc)
32 #define __DISABLED_CHAR '\0'
36 struct tty_buffer *next;
37 struct llist_node free;
44 /* Data points here */
48 /* Values for .flags field of tty_buffer */
49 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
51 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
53 return ((unsigned char *)b->data) + ofs;
56 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
58 return (char *)char_buf_ptr(b, ofs) + b->size;
62 struct tty_buffer *head; /* Queue head */
63 struct work_struct work;
66 struct tty_buffer sentinel;
67 struct llist_head free; /* Free queue head */
68 atomic_t mem_used; /* In-use buffers excluding free list */
70 struct tty_buffer *tail; /* Active buffer */
73 * When a break, frame error, or parity error happens, these codes are
74 * stuffed into the flags buffer.
82 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
83 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
84 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
85 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
86 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
87 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
88 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
89 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
90 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
91 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
92 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
93 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
94 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
95 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
96 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
97 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
98 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
100 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
101 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
102 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
103 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
105 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
106 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
107 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
108 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
109 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
110 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
111 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
112 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
113 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
114 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
115 #define I_IXON(tty) _I_FLAG((tty), IXON)
116 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
117 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
118 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
119 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
121 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
122 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
123 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
124 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
125 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
126 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
127 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
128 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
129 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
130 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
131 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
132 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
133 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
134 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
136 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
137 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
138 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
139 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
140 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
141 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
142 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
143 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
144 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
145 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
146 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
148 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
149 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
150 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
151 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
152 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
153 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
154 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
155 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
156 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
157 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
158 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
159 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
160 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
161 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
162 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
163 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
166 struct signal_struct;
169 * Port level information. Each device keeps its own port level information
170 * so provide a common structure for those ports wanting to use common support
173 * The tty port has a different lifetime to the tty so must be kept apart.
174 * In addition be careful as tty -> port mappings are valid for the life
175 * of the tty object but in many cases port -> tty mappings are valid only
176 * until a hangup so don't use the wrong path.
181 struct tty_port_operations {
182 /* Return 1 if the carrier is raised */
183 int (*carrier_raised)(struct tty_port *port);
184 /* Control the DTR line */
185 void (*dtr_rts)(struct tty_port *port, int raise);
186 /* Called when the last close completes or a hangup finishes
187 IFF the port was initialized. Do not use to free resources. Called
188 under the port mutex to serialize against activate/shutdowns */
189 void (*shutdown)(struct tty_port *port);
190 /* Called under the port mutex from tty_port_open, serialized using
192 /* FIXME: long term getting the tty argument *out* of this would be
194 int (*activate)(struct tty_port *port, struct tty_struct *tty);
195 /* Called on the final put of a port */
196 void (*destruct)(struct tty_port *port);
199 struct tty_port_client_operations {
200 int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
201 void (*write_wakeup)(struct tty_port *port);
204 extern const struct tty_port_client_operations tty_port_default_client_ops;
207 struct tty_bufhead buf; /* Locked internally */
208 struct tty_struct *tty; /* Back pointer */
209 struct tty_struct *itty; /* internal back ptr */
210 const struct tty_port_operations *ops; /* Port operations */
211 const struct tty_port_client_operations *client_ops; /* Port client operations */
212 spinlock_t lock; /* Lock protecting tty field */
213 int blocked_open; /* Waiting to open */
214 int count; /* Usage count */
215 wait_queue_head_t open_wait; /* Open waiters */
216 wait_queue_head_t delta_msr_wait; /* Modem status change */
217 unsigned long flags; /* User TTY flags ASYNC_ */
218 unsigned long iflags; /* Internal flags TTY_PORT_ */
219 unsigned char console:1; /* port is a console */
220 struct mutex mutex; /* Locking */
221 struct mutex buf_mutex; /* Buffer alloc lock */
222 unsigned char *xmit_buf; /* Optional buffer */
223 unsigned int close_delay; /* Close port delay */
224 unsigned int closing_wait; /* Delay for output */
225 int drain_delay; /* Set to zero if no pure time
226 based drain is needed else
227 set to size of fifo */
228 struct kref kref; /* Ref counter */
232 /* tty_port::iflags bits -- use atomic bit ops */
233 #define TTY_PORT_INITIALIZED 0 /* device is initialized */
234 #define TTY_PORT_SUSPENDED 1 /* device is suspended */
235 #define TTY_PORT_ACTIVE 2 /* device is open */
238 * uart drivers: use the uart_port::status field and the UPSTAT_* defines
239 * for s/w-based flow control steering and carrier detection status
241 #define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */
242 #define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */
243 #define TTY_PORT_KOPENED 5 /* device exclusively opened by
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;
263 struct device *dev; /* class device or NULL (e.g. ptys, serdev) */
264 struct tty_driver *driver;
265 const struct tty_operations *ops;
268 /* Protects ldisc changes: Lock tty not pty */
269 struct ld_semaphore ldisc_sem;
270 struct tty_ldisc *ldisc;
272 struct mutex atomic_write_lock;
273 struct mutex legacy_mutex;
274 struct mutex throttle_mutex;
275 struct rw_semaphore termios_rwsem;
276 struct mutex winsize_mutex;
277 spinlock_t ctrl_lock;
278 spinlock_t flow_lock;
279 /* Termios values are protected by the termios rwsem */
280 struct ktermios termios, termios_locked;
282 struct pid *pgrp; /* Protected by ctrl lock */
284 * Writes protected by both ctrl lock and legacy mutex, readers must use
285 * at least one of them.
290 struct winsize winsize; /* winsize_mutex */
291 unsigned long stopped:1, /* flow_lock */
293 unused:BITS_PER_LONG - 2;
295 unsigned long ctrl_status:8, /* ctrl_lock */
297 unused_ctrl:BITS_PER_LONG - 9;
298 unsigned int receive_room; /* Bytes free for queue */
301 struct tty_struct *link;
302 struct fasync_struct *fasync;
303 wait_queue_head_t write_wait;
304 wait_queue_head_t read_wait;
305 struct work_struct hangup_work;
308 spinlock_t files_lock; /* protects tty_files list */
309 struct list_head tty_files;
311 #define N_TTY_BUF_SIZE 4096
314 unsigned char *write_buf;
316 /* If the tty has a pending do_SAK, queue it here - akpm */
317 struct work_struct SAK_work;
318 struct tty_port *port;
319 } __randomize_layout;
321 /* Each of a tty's open files has private_data pointing to tty_file_private */
322 struct tty_file_private {
323 struct tty_struct *tty;
325 struct list_head list;
328 /* tty magic number */
329 #define TTY_MAGIC 0x5401
332 * These bits are used in the flags field of the tty structure.
334 * So that interrupts won't be able to mess up the queues,
335 * copy_to_cooked must be atomic with respect to itself, as must
336 * tty->write. Thus, you must use the inline functions set_bit() and
337 * clear_bit() to make things atomic.
339 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
340 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
341 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
342 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
343 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
344 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
345 #define TTY_PTY_LOCK 16 /* pty private */
346 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
347 #define TTY_HUPPED 18 /* Post driver->hangup() */
348 #define TTY_HUPPING 19 /* Hangup in progress */
349 #define TTY_LDISC_CHANGING 20 /* Change pending - non-block IO */
350 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
352 static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
354 return file->f_flags & O_NONBLOCK ||
355 test_bit(TTY_LDISC_CHANGING, &tty->flags);
358 static inline bool tty_io_error(struct tty_struct *tty)
360 return test_bit(TTY_IO_ERROR, &tty->flags);
363 static inline bool tty_throttled(struct tty_struct *tty)
365 return test_bit(TTY_THROTTLED, &tty->flags);
369 extern void tty_kref_put(struct tty_struct *tty);
370 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
371 extern void tty_vhangup_self(void);
372 extern void disassociate_ctty(int priv);
373 extern dev_t tty_devnum(struct tty_struct *tty);
374 extern void proc_clear_tty(struct task_struct *p);
375 extern struct tty_struct *get_current_tty(void);
377 extern int __init tty_init(void);
378 extern const char *tty_name(const struct tty_struct *tty);
379 extern struct tty_struct *tty_kopen_exclusive(dev_t device);
380 extern struct tty_struct *tty_kopen_shared(dev_t device);
381 extern void tty_kclose(struct tty_struct *tty);
382 extern int tty_dev_name_to_number(const char *name, dev_t *number);
384 static inline void tty_kref_put(struct tty_struct *tty)
386 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
388 static inline void tty_vhangup_self(void)
390 static inline void disassociate_ctty(int priv)
392 static inline dev_t tty_devnum(struct tty_struct *tty)
394 static inline void proc_clear_tty(struct task_struct *p)
396 static inline struct tty_struct *get_current_tty(void)
399 static inline int __init tty_init(void)
401 static inline const char *tty_name(const struct tty_struct *tty)
403 static inline struct tty_struct *tty_kopen_exclusive(dev_t device)
404 { return ERR_PTR(-ENODEV); }
405 static inline void tty_kclose(struct tty_struct *tty)
407 static inline int tty_dev_name_to_number(const char *name, dev_t *number)
408 { return -ENOTSUPP; }
411 extern struct ktermios tty_std_termios;
413 extern int vcs_init(void);
415 extern struct class *tty_class;
418 * tty_kref_get - get a tty reference
421 * Return a new reference to a tty object. The caller must hold
422 * sufficient locks/counts to ensure that their existing reference cannot
426 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
429 kref_get(&tty->kref);
433 extern const char *tty_driver_name(const struct tty_struct *tty);
434 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
435 extern void stop_tty(struct tty_struct *tty);
436 extern void start_tty(struct tty_struct *tty);
437 extern int tty_register_driver(struct tty_driver *driver);
438 extern void tty_unregister_driver(struct tty_driver *driver);
439 extern struct device *tty_register_device(struct tty_driver *driver,
440 unsigned index, struct device *dev);
441 extern struct device *tty_register_device_attr(struct tty_driver *driver,
442 unsigned index, struct device *device,
444 const struct attribute_group **attr_grp);
445 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
446 extern void tty_write_message(struct tty_struct *tty, char *msg);
447 extern int tty_send_xchar(struct tty_struct *tty, char ch);
448 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
449 extern int tty_chars_in_buffer(struct tty_struct *tty);
450 extern int tty_write_room(struct tty_struct *tty);
451 extern void tty_driver_flush_buffer(struct tty_struct *tty);
452 extern void tty_throttle(struct tty_struct *tty);
453 extern void tty_unthrottle(struct tty_struct *tty);
454 extern int tty_throttle_safe(struct tty_struct *tty);
455 extern int tty_unthrottle_safe(struct tty_struct *tty);
456 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
457 extern int tty_get_icount(struct tty_struct *tty,
458 struct serial_icounter_struct *icount);
459 extern int is_current_pgrp_orphaned(void);
460 extern void tty_hangup(struct tty_struct *tty);
461 extern void tty_vhangup(struct tty_struct *tty);
462 extern int tty_hung_up_p(struct file *filp);
463 extern void do_SAK(struct tty_struct *tty);
464 extern void __do_SAK(struct tty_struct *tty);
465 extern void no_tty(void);
466 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
467 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
468 speed_t ibaud, speed_t obaud);
469 extern void tty_encode_baud_rate(struct tty_struct *tty,
470 speed_t ibaud, speed_t obaud);
473 * tty_get_baud_rate - get tty bit rates
476 * Returns the baud rate as an integer for this terminal. The
477 * termios lock must be held by the caller and the terminal bit
478 * flags may be updated.
482 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
484 return tty_termios_baud_rate(&tty->termios);
487 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
488 extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
489 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
491 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
492 extern void tty_ldisc_deref(struct tty_ldisc *);
493 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
494 extern const struct seq_operations tty_ldiscs_seq_ops;
496 extern void tty_wakeup(struct tty_struct *tty);
497 extern void tty_ldisc_flush(struct tty_struct *tty);
499 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
500 unsigned int cmd, unsigned long arg);
501 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
502 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
503 extern void tty_release_struct(struct tty_struct *tty, int idx);
504 extern void tty_init_termios(struct tty_struct *tty);
505 extern void tty_save_termios(struct tty_struct *tty);
506 extern int tty_standard_install(struct tty_driver *driver,
507 struct tty_struct *tty);
509 extern struct mutex tty_mutex;
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 struct device *tty_port_register_device_serdev(struct tty_port *port,
522 struct tty_driver *driver, unsigned index,
523 struct device *device);
524 extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
525 struct tty_driver *driver, unsigned index,
526 struct device *device, void *drvdata,
527 const struct attribute_group **attr_grp);
528 extern void tty_port_unregister_device(struct tty_port *port,
529 struct tty_driver *driver, unsigned index);
530 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
531 extern void tty_port_free_xmit_buf(struct tty_port *port);
532 extern void tty_port_destroy(struct tty_port *port);
533 extern void tty_port_put(struct tty_port *port);
535 static inline struct tty_port *tty_port_get(struct tty_port *port)
537 if (port && kref_get_unless_zero(&port->kref))
542 /* If the cts flow control is enabled, return true. */
543 static inline bool tty_port_cts_enabled(const struct tty_port *port)
545 return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
548 static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
550 assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val);
553 static inline bool tty_port_active(const struct tty_port *port)
555 return test_bit(TTY_PORT_ACTIVE, &port->iflags);
558 static inline void tty_port_set_active(struct tty_port *port, bool val)
560 assign_bit(TTY_PORT_ACTIVE, &port->iflags, val);
563 static inline bool tty_port_check_carrier(const struct tty_port *port)
565 return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
568 static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
570 assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val);
573 static inline bool tty_port_suspended(const struct tty_port *port)
575 return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
578 static inline void tty_port_set_suspended(struct tty_port *port, bool val)
580 assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val);
583 static inline bool tty_port_initialized(const struct tty_port *port)
585 return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
588 static inline void tty_port_set_initialized(struct tty_port *port, bool val)
590 assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val);
593 static inline bool tty_port_kopened(const struct tty_port *port)
595 return test_bit(TTY_PORT_KOPENED, &port->iflags);
598 static inline void tty_port_set_kopened(struct tty_port *port, bool val)
600 assign_bit(TTY_PORT_KOPENED, &port->iflags, val);
603 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
604 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
605 extern int tty_port_carrier_raised(struct tty_port *port);
606 extern void tty_port_raise_dtr_rts(struct tty_port *port);
607 extern void tty_port_lower_dtr_rts(struct tty_port *port);
608 extern void tty_port_hangup(struct tty_port *port);
609 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
610 extern void tty_port_tty_wakeup(struct tty_port *port);
611 extern int tty_port_block_til_ready(struct tty_port *port,
612 struct tty_struct *tty, struct file *filp);
613 extern int tty_port_close_start(struct tty_port *port,
614 struct tty_struct *tty, struct file *filp);
615 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
616 extern void tty_port_close(struct tty_port *port,
617 struct tty_struct *tty, struct file *filp);
618 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
619 struct tty_struct *tty);
620 extern int tty_port_open(struct tty_port *port,
621 struct tty_struct *tty, struct file *filp);
622 static inline int tty_port_users(struct tty_port *port)
624 return port->count + port->blocked_open;
627 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
628 extern int tty_unregister_ldisc(int disc);
629 extern int tty_set_ldisc(struct tty_struct *tty, int disc);
630 extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
634 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
636 extern void __init n_tty_init(void);
638 static inline void n_tty_init(void) { }
643 extern void tty_audit_exit(void);
644 extern void tty_audit_fork(struct signal_struct *sig);
645 extern int tty_audit_push(void);
647 static inline void tty_audit_exit(void)
650 static inline void tty_audit_fork(struct signal_struct *sig)
653 static inline int tty_audit_push(void)
660 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
661 unsigned int cmd, unsigned long arg);
665 extern int vt_ioctl(struct tty_struct *tty,
666 unsigned int cmd, unsigned long arg);
668 extern long vt_compat_ioctl(struct tty_struct *tty,
669 unsigned int cmd, unsigned long arg);
672 /* functions for preparation of BKL removal */
673 extern void tty_lock(struct tty_struct *tty);
674 extern int tty_lock_interruptible(struct tty_struct *tty);
675 extern void tty_unlock(struct tty_struct *tty);
676 extern void tty_lock_slave(struct tty_struct *tty);
677 extern void tty_unlock_slave(struct tty_struct *tty);
678 extern void tty_set_lock_subclass(struct tty_struct *tty);
680 #ifdef CONFIG_PROC_FS
681 extern void proc_tty_register_driver(struct tty_driver *);
682 extern void proc_tty_unregister_driver(struct tty_driver *);
684 static inline void proc_tty_register_driver(struct tty_driver *d) {}
685 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}