5 #include <linux/major.h>
6 #include <linux/termios.h>
7 #include <linux/workqueue.h>
8 #include <linux/tty_driver.h>
9 #include <linux/tty_ldisc.h>
10 #include <linux/mutex.h>
11 #include <linux/tty_flags.h>
12 #include <uapi/linux/tty.h>
13 #include <linux/rwsem.h>
14 #include <linux/llist.h>
18 * Lock subclasses for tty locks
20 * TTY_LOCK_NORMAL is for normal ttys and master ptys.
21 * TTY_LOCK_SLAVE is for slave ptys only.
23 * Lock subclasses are necessary for handling nested locking with pty pairs.
24 * tty locks which use nested locking:
26 * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
27 * The stable lock order is master pty first, then slave pty.
36 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
37 * hardcoded at present.)
39 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
40 #define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
41 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
44 * This character is the same as _POSIX_VDISABLE: it cannot be used as
45 * a c_cc[] character, but indicates that a particular special character
46 * isn't in use (eg VINTR has no character etc)
48 #define __DISABLED_CHAR '\0'
52 struct tty_buffer *next;
53 struct llist_node free;
60 /* Data points here */
61 unsigned long data[0];
64 /* Values for .flags field of tty_buffer */
65 #define TTYB_NORMAL 1 /* buffer has no flags buffer */
67 static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
69 return ((unsigned char *)b->data) + ofs;
72 static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
74 return (char *)char_buf_ptr(b, ofs) + b->size;
78 struct tty_buffer *head; /* Queue head */
79 struct work_struct work;
82 struct tty_buffer sentinel;
83 struct llist_head free; /* Free queue head */
84 atomic_t mem_used; /* In-use buffers excluding free list */
86 struct tty_buffer *tail; /* Active buffer */
89 * When a break, frame error, or parity error happens, these codes are
90 * stuffed into the flags buffer.
98 #define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
99 #define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
100 #define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
101 #define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
102 #define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
103 #define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
104 #define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
105 #define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
106 #define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
107 #define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
108 #define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
109 #define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
110 #define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
111 #define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
112 #define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
113 #define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
114 #define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
116 #define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
117 #define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
118 #define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
119 #define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
121 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
122 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
123 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
124 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
125 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
126 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
127 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
128 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
129 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
130 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
131 #define I_IXON(tty) _I_FLAG((tty), IXON)
132 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
133 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
134 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
135 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
137 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
138 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
139 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
140 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
141 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
142 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
143 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
144 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
145 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
146 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
147 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
148 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
149 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
150 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
152 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
153 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
154 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
155 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
156 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
157 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
158 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
159 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
160 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
161 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
162 #define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
164 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
165 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
166 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
167 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
168 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
169 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
170 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
171 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
172 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
173 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
174 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
175 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
176 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
177 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
178 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
179 #define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
182 struct signal_struct;
185 * Port level information. Each device keeps its own port level information
186 * so provide a common structure for those ports wanting to use common support
189 * The tty port has a different lifetime to the tty so must be kept apart.
190 * In addition be careful as tty -> port mappings are valid for the life
191 * of the tty object but in many cases port -> tty mappings are valid only
192 * until a hangup so don't use the wrong path.
197 struct tty_port_operations {
198 /* Return 1 if the carrier is raised */
199 int (*carrier_raised)(struct tty_port *port);
200 /* Control the DTR line */
201 void (*dtr_rts)(struct tty_port *port, int raise);
202 /* Called when the last close completes or a hangup finishes
203 IFF the port was initialized. Do not use to free resources. Called
204 under the port mutex to serialize against activate/shutdowns */
205 void (*shutdown)(struct tty_port *port);
206 /* Called under the port mutex from tty_port_open, serialized using
208 /* FIXME: long term getting the tty argument *out* of this would be
210 int (*activate)(struct tty_port *port, struct tty_struct *tty);
211 /* Called on the final put of a port */
212 void (*destruct)(struct tty_port *port);
216 struct tty_bufhead buf; /* Locked internally */
217 struct tty_struct *tty; /* Back pointer */
218 struct tty_struct *itty; /* internal back ptr */
219 const struct tty_port_operations *ops; /* Port operations */
220 spinlock_t lock; /* Lock protecting tty field */
221 int blocked_open; /* Waiting to open */
222 int count; /* Usage count */
223 wait_queue_head_t open_wait; /* Open waiters */
224 wait_queue_head_t close_wait; /* Close waiters */
225 wait_queue_head_t delta_msr_wait; /* Modem status change */
226 unsigned long flags; /* TTY flags ASY_*/
227 unsigned char console:1, /* port is a console */
228 low_latency:1; /* optional: tune for latency */
229 struct mutex mutex; /* Locking */
230 struct mutex buf_mutex; /* Buffer alloc lock */
231 unsigned char *xmit_buf; /* Optional buffer */
232 unsigned int close_delay; /* Close port delay */
233 unsigned int closing_wait; /* Delay for output */
234 int drain_delay; /* Set to zero if no pure time
235 based drain is needed else
236 set to size of fifo */
237 struct kref kref; /* Ref counter */
241 * Where all of the state associated with a tty is kept while the tty
242 * is open. Since the termios state should be kept even if the tty
243 * has been closed --- for things like the baud rate, etc --- it is
244 * not stored here, but rather a pointer to the real state is stored
245 * here. Possible the winsize structure should have the same
246 * treatment, but (1) the default 80x24 is usually right and (2) it's
247 * most often used by a windowing system, which will set the correct
248 * size each time the window is created or resized anyway.
252 struct tty_operations;
258 struct tty_driver *driver;
259 const struct tty_operations *ops;
262 /* Protects ldisc changes: Lock tty not pty */
263 struct ld_semaphore ldisc_sem;
264 struct tty_ldisc *ldisc;
266 struct mutex atomic_write_lock;
267 struct mutex legacy_mutex;
268 struct mutex throttle_mutex;
269 struct rw_semaphore termios_rwsem;
270 struct mutex winsize_mutex;
271 spinlock_t ctrl_lock;
272 spinlock_t flow_lock;
273 /* Termios values are protected by the termios rwsem */
274 struct ktermios termios, termios_locked;
275 struct termiox *termiox; /* May be NULL for unsupported */
277 struct pid *pgrp; /* Protected by ctrl lock */
281 struct winsize winsize; /* winsize_mutex */
282 unsigned long stopped:1, /* flow_lock */
284 unused:BITS_PER_LONG - 2;
286 unsigned long ctrl_status:8, /* ctrl_lock */
288 unused_ctrl:BITS_PER_LONG - 9;
289 unsigned int receive_room; /* Bytes free for queue */
292 struct tty_struct *link;
293 struct fasync_struct *fasync;
294 int alt_speed; /* For magic substitution of 38400 bps */
295 wait_queue_head_t write_wait;
296 wait_queue_head_t read_wait;
297 struct work_struct hangup_work;
300 struct list_head tty_files;
302 #define N_TTY_BUF_SIZE 4096
305 unsigned char *write_buf;
307 /* If the tty has a pending do_SAK, queue it here - akpm */
308 struct work_struct SAK_work;
309 struct tty_port *port;
312 /* Each of a tty's open files has private_data pointing to tty_file_private */
313 struct tty_file_private {
314 struct tty_struct *tty;
316 struct list_head list;
319 /* tty magic number */
320 #define TTY_MAGIC 0x5401
323 * These bits are used in the flags field of the tty structure.
325 * So that interrupts won't be able to mess up the queues,
326 * copy_to_cooked must be atomic with respect to itself, as must
327 * tty->write. Thus, you must use the inline functions set_bit() and
328 * clear_bit() to make things atomic.
330 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
331 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
332 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
333 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
334 #define TTY_DEBUG 4 /* Debugging */
335 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
336 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
337 #define TTY_PTY_LOCK 16 /* pty private */
338 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
339 #define TTY_HUPPED 18 /* Post driver->hangup() */
340 #define TTY_LDISC_HALTED 22 /* Line discipline is halted */
342 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
344 /* Values for tty->flow_change */
345 #define TTY_THROTTLE_SAFE 1
346 #define TTY_UNTHROTTLE_SAFE 2
348 static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
350 tty->flow_change = val;
353 static inline void tty_set_flow_change(struct tty_struct *tty, int val)
355 tty->flow_change = val;
360 extern void console_init(void);
361 extern void tty_kref_put(struct tty_struct *tty);
362 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
363 extern void tty_vhangup_self(void);
364 extern void disassociate_ctty(int priv);
365 extern dev_t tty_devnum(struct tty_struct *tty);
366 extern void proc_clear_tty(struct task_struct *p);
367 extern struct tty_struct *get_current_tty(void);
369 extern int __init tty_init(void);
371 static inline void console_init(void)
373 static inline void tty_kref_put(struct tty_struct *tty)
375 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
377 static inline void tty_vhangup_self(void)
379 static inline void disassociate_ctty(int priv)
381 static inline dev_t tty_devnum(struct tty_struct *tty)
383 static inline void proc_clear_tty(struct task_struct *p)
385 static inline struct tty_struct *get_current_tty(void)
388 static inline int __init tty_init(void)
392 extern void tty_write_flush(struct tty_struct *);
394 extern struct ktermios tty_std_termios;
396 extern int vcs_init(void);
398 extern struct class *tty_class;
401 * tty_kref_get - get a tty reference
404 * Return a new reference to a tty object. The caller must hold
405 * sufficient locks/counts to ensure that their existing reference cannot
409 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
412 kref_get(&tty->kref);
416 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
417 const char *routine);
418 extern char *tty_name(struct tty_struct *tty, char *buf);
419 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
420 extern int tty_check_change(struct tty_struct *tty);
421 extern void __stop_tty(struct tty_struct *tty);
422 extern void stop_tty(struct tty_struct *tty);
423 extern void __start_tty(struct tty_struct *tty);
424 extern void start_tty(struct tty_struct *tty);
425 extern int tty_register_driver(struct tty_driver *driver);
426 extern int tty_unregister_driver(struct tty_driver *driver);
427 extern struct device *tty_register_device(struct tty_driver *driver,
428 unsigned index, struct device *dev);
429 extern struct device *tty_register_device_attr(struct tty_driver *driver,
430 unsigned index, struct device *device,
432 const struct attribute_group **attr_grp);
433 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
434 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
436 extern void tty_write_message(struct tty_struct *tty, char *msg);
437 extern int tty_send_xchar(struct tty_struct *tty, char ch);
438 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
439 extern int tty_chars_in_buffer(struct tty_struct *tty);
440 extern int tty_write_room(struct tty_struct *tty);
441 extern void tty_driver_flush_buffer(struct tty_struct *tty);
442 extern void tty_throttle(struct tty_struct *tty);
443 extern void tty_unthrottle(struct tty_struct *tty);
444 extern int tty_throttle_safe(struct tty_struct *tty);
445 extern int tty_unthrottle_safe(struct tty_struct *tty);
446 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
447 extern void tty_driver_remove_tty(struct tty_driver *driver,
448 struct tty_struct *tty);
449 extern void tty_free_termios(struct tty_struct *tty);
450 extern int is_current_pgrp_orphaned(void);
451 extern int is_ignored(int sig);
452 extern int tty_signal(int sig, struct tty_struct *tty);
453 extern void tty_hangup(struct tty_struct *tty);
454 extern void tty_vhangup(struct tty_struct *tty);
455 extern int tty_hung_up_p(struct file *filp);
456 extern void do_SAK(struct tty_struct *tty);
457 extern void __do_SAK(struct tty_struct *tty);
458 extern void no_tty(void);
459 extern void tty_flush_to_ldisc(struct tty_struct *tty);
460 extern void tty_buffer_free_all(struct tty_port *port);
461 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
462 extern void tty_buffer_init(struct tty_port *port);
463 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
464 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
465 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
466 speed_t ibaud, speed_t obaud);
467 extern void tty_encode_baud_rate(struct tty_struct *tty,
468 speed_t ibaud, speed_t obaud);
471 * tty_get_baud_rate - get tty bit rates
474 * Returns the baud rate as an integer for this terminal. The
475 * termios lock must be held by the caller and the terminal bit
476 * flags may be updated.
480 static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
482 return tty_termios_baud_rate(&tty->termios);
485 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
486 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
487 extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
489 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
490 extern void tty_ldisc_deref(struct tty_ldisc *);
491 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
492 extern void tty_ldisc_hangup(struct tty_struct *tty);
493 extern const struct file_operations tty_ldiscs_proc_fops;
495 extern void tty_wakeup(struct tty_struct *tty);
496 extern void tty_ldisc_flush(struct tty_struct *tty);
498 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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 void tty_default_fops(struct file_operations *fops);
503 extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
504 extern int tty_alloc_file(struct file *file);
505 extern void tty_add_file(struct tty_struct *tty, struct file *file);
506 extern void tty_free_file(struct file *file);
507 extern void free_tty_struct(struct tty_struct *tty);
508 extern void deinitialize_tty_struct(struct tty_struct *tty);
509 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
510 extern int tty_release(struct inode *inode, struct file *filp);
511 extern int tty_init_termios(struct tty_struct *tty);
512 extern int tty_standard_install(struct tty_driver *driver,
513 struct tty_struct *tty);
515 extern struct mutex tty_mutex;
516 extern spinlock_t tty_files_lock;
518 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
520 extern void tty_port_init(struct tty_port *port);
521 extern void tty_port_link_device(struct tty_port *port,
522 struct tty_driver *driver, unsigned index);
523 extern struct device *tty_port_register_device(struct tty_port *port,
524 struct tty_driver *driver, unsigned index,
525 struct device *device);
526 extern struct device *tty_port_register_device_attr(struct tty_port *port,
527 struct tty_driver *driver, unsigned index,
528 struct device *device, void *drvdata,
529 const struct attribute_group **attr_grp);
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(struct tty_port *port)
545 return port->flags & ASYNC_CTS_FLOW;
548 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
549 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
550 extern int tty_port_carrier_raised(struct tty_port *port);
551 extern void tty_port_raise_dtr_rts(struct tty_port *port);
552 extern void tty_port_lower_dtr_rts(struct tty_port *port);
553 extern void tty_port_hangup(struct tty_port *port);
554 extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
555 extern void tty_port_tty_wakeup(struct tty_port *port);
556 extern int tty_port_block_til_ready(struct tty_port *port,
557 struct tty_struct *tty, struct file *filp);
558 extern int tty_port_close_start(struct tty_port *port,
559 struct tty_struct *tty, struct file *filp);
560 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
561 extern void tty_port_close(struct tty_port *port,
562 struct tty_struct *tty, struct file *filp);
563 extern int tty_port_install(struct tty_port *port, struct tty_driver *driver,
564 struct tty_struct *tty);
565 extern int tty_port_open(struct tty_port *port,
566 struct tty_struct *tty, struct file *filp);
567 static inline int tty_port_users(struct tty_port *port)
569 return port->count + port->blocked_open;
572 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
573 extern int tty_unregister_ldisc(int disc);
574 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
575 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
576 extern void tty_ldisc_release(struct tty_struct *tty);
577 extern void tty_ldisc_init(struct tty_struct *tty);
578 extern void tty_ldisc_deinit(struct tty_struct *tty);
579 extern void tty_ldisc_begin(void);
581 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
584 if (ld->ops->receive_buf2)
585 count = ld->ops->receive_buf2(ld->tty, p, f, count);
587 count = min_t(int, count, ld->tty->receive_room);
589 ld->ops->receive_buf(ld->tty, p, f, count);
596 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
597 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
601 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
602 size_t size, unsigned icanon);
603 extern void tty_audit_exit(void);
604 extern void tty_audit_fork(struct signal_struct *sig);
605 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
606 extern void tty_audit_push(struct tty_struct *tty);
607 extern int tty_audit_push_current(void);
609 static inline void tty_audit_add_data(struct tty_struct *tty,
610 unsigned char *data, size_t size, unsigned icanon)
613 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
616 static inline void tty_audit_exit(void)
619 static inline void tty_audit_fork(struct signal_struct *sig)
622 static inline void tty_audit_push(struct tty_struct *tty)
625 static inline int tty_audit_push_current(void)
632 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
633 unsigned int cmd, unsigned long arg);
634 extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
635 unsigned int cmd, unsigned long arg);
639 extern int vt_ioctl(struct tty_struct *tty,
640 unsigned int cmd, unsigned long arg);
642 extern long vt_compat_ioctl(struct tty_struct *tty,
643 unsigned int cmd, unsigned long arg);
646 /* functions for preparation of BKL removal */
647 extern void __lockfunc tty_lock(struct tty_struct *tty);
648 extern void __lockfunc tty_unlock(struct tty_struct *tty);
649 extern void __lockfunc tty_lock_slave(struct tty_struct *tty);
650 extern void __lockfunc tty_unlock_slave(struct tty_struct *tty);
651 extern void tty_set_lock_subclass(struct tty_struct *tty);
653 * this shall be called only from where BTM is held (like close)
655 * We need this to ensure nobody waits for us to finish while we are waiting.
656 * Without this we were encountering system stalls.
658 * This should be indeed removed with BTM removal later.
660 * Locking: BTM required. Nobody is allowed to hold port->mutex.
662 static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
665 tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
666 tty_wait_until_sent(tty, timeout);
671 * wait_event_interruptible_tty -- wait for a condition with the tty lock held
673 * The condition we are waiting for might take a long time to
674 * become true, or might depend on another thread taking the
675 * BTM. In either case, we need to drop the BTM to guarantee
676 * forward progress. This is a leftover from the conversion
677 * from the BKL and should eventually get removed as the BTM
680 * Do not use in new code.
682 #define wait_event_interruptible_tty(tty, wq, condition) \
686 __ret = __wait_event_interruptible_tty(tty, wq, \
691 #define __wait_event_interruptible_tty(tty, wq, condition) \
692 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
697 #ifdef CONFIG_PROC_FS
698 extern void proc_tty_register_driver(struct tty_driver *);
699 extern void proc_tty_unregister_driver(struct tty_driver *);
701 static inline void proc_tty_register_driver(struct tty_driver *d) {}
702 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}