5 * 'tty.h' defines some structures used by tty_io.c and some defines.
10 #include <linux/major.h>
11 #include <linux/termios.h>
12 #include <linux/workqueue.h>
13 #include <linux/tty_driver.h>
14 #include <linux/tty_ldisc.h>
15 #include <linux/mutex.h>
17 #include <asm/system.h>
21 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
22 * hardcoded at present.)
24 #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
25 #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
28 /* line disciplines */
35 #define N_X25 6 /* X.25 async */
37 #define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
38 #define N_R3964 9 /* Reserved for Simatic R3964 module */
39 #define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
40 #define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
41 #define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
42 /* cards about SMS messages */
43 #define N_HDLC 13 /* synchronous HDLC */
44 #define N_SYNC_PPP 14 /* synchronous PPP */
45 #define N_HCI 15 /* Bluetooth HCI UART */
46 #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
47 #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
48 #define N_PPS 18 /* Pulse per Second */
51 * This character is the same as _POSIX_VDISABLE: it cannot be used as
52 * a c_cc[] character, but indicates that a particular special character
53 * isn't in use (eg VINTR has no character etc)
55 #define __DISABLED_CHAR '\0'
58 struct tty_buffer *next;
60 unsigned char *flag_buf_ptr;
65 /* Data points here */
66 unsigned long data[0];
70 struct delayed_work work;
72 struct tty_buffer *head; /* Queue head */
73 struct tty_buffer *tail; /* Active buffer */
74 struct tty_buffer *free; /* Free queue head */
75 int memory_used; /* Buffer space used excluding
79 * When a break, frame error, or parity error happens, these codes are
80 * stuffed into the flags buffer.
88 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
89 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
90 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
91 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
92 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
93 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
94 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
95 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
96 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
97 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
98 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
99 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
100 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
101 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
102 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
103 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
104 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
106 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
107 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
108 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
109 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
111 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
112 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
113 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
114 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
115 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
116 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
117 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
118 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
119 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
120 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
121 #define I_IXON(tty) _I_FLAG((tty), IXON)
122 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
123 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
124 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
125 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
127 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
128 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
129 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
130 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
131 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
132 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
133 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
134 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
135 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
136 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
137 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
138 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
139 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
140 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
142 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
143 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
144 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
145 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
146 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
147 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
148 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
149 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
150 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
151 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
153 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
154 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
155 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
156 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
157 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
158 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
159 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
160 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
161 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
162 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
163 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
164 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
165 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
166 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
167 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
170 struct signal_struct;
173 * Port level information. Each device keeps its own port level information
174 * so provide a common structure for those ports wanting to use common support
177 * The tty port has a different lifetime to the tty so must be kept apart.
178 * In addition be careful as tty -> port mappings are valid for the life
179 * of the tty object but in many cases port -> tty mappings are valid only
180 * until a hangup so don't use the wrong path.
185 struct tty_port_operations {
186 /* Return 1 if the carrier is raised */
187 int (*carrier_raised)(struct tty_port *port);
188 void (*dtr_rts)(struct tty_port *port, int raise);
192 struct tty_struct *tty; /* Back pointer */
193 const struct tty_port_operations *ops; /* Port operations */
194 spinlock_t lock; /* Lock protecting tty field */
195 int blocked_open; /* Waiting to open */
196 int count; /* Usage count */
197 wait_queue_head_t open_wait; /* Open waiters */
198 wait_queue_head_t close_wait; /* Close waiters */
199 unsigned long flags; /* TTY flags ASY_*/
200 struct mutex mutex; /* Locking */
201 unsigned char *xmit_buf; /* Optional buffer */
202 int close_delay; /* Close port delay */
203 int closing_wait; /* Delay for output */
204 int drain_delay; /* Set to zero if no pure time
205 based drain is needed else
206 set to size of fifo */
210 * Where all of the state associated with a tty is kept while the tty
211 * is open. Since the termios state should be kept even if the tty
212 * has been closed --- for things like the baud rate, etc --- it is
213 * not stored here, but rather a pointer to the real state is stored
214 * here. Possible the winsize structure should have the same
215 * treatment, but (1) the default 80x24 is usually right and (2) it's
216 * most often used by a windowing system, which will set the correct
217 * size each time the window is created or resized anyway.
221 struct tty_operations;
226 struct tty_driver *driver;
227 const struct tty_operations *ops;
230 /* Protects ldisc changes: Lock tty not pty */
231 struct mutex ldisc_mutex;
232 struct tty_ldisc *ldisc;
234 struct mutex termios_mutex;
235 spinlock_t ctrl_lock;
236 /* Termios values are protected by the termios mutex */
237 struct ktermios *termios, *termios_locked;
238 struct termiox *termiox; /* May be NULL for unsupported */
240 struct pid *pgrp; /* Protected by ctrl lock */
244 struct winsize winsize; /* termios mutex */
245 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
246 unsigned char low_latency:1, warned:1;
247 unsigned char ctrl_status; /* ctrl_lock */
248 unsigned int receive_room; /* Bytes free for queue */
250 struct tty_struct *link;
251 struct fasync_struct *fasync;
252 struct tty_bufhead buf; /* Locked internally */
253 int alt_speed; /* For magic substitution of 38400 bps */
254 wait_queue_head_t write_wait;
255 wait_queue_head_t read_wait;
256 struct work_struct hangup_work;
259 struct list_head tty_files;
261 #define N_TTY_BUF_SIZE 4096
264 * The following is data for the N_TTY line discipline. For
265 * historical reasons, this is included in the tty structure.
266 * Mostly locked by the BKL.
269 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
270 unsigned char closing:1;
271 unsigned char echo_overrun:1;
272 unsigned short minimum_to_wake;
273 unsigned long overrun_time;
275 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
280 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
281 unsigned char *echo_buf;
282 unsigned int echo_pos;
283 unsigned int echo_cnt;
285 unsigned long canon_head;
286 unsigned int canon_column;
287 struct mutex atomic_read_lock;
288 struct mutex atomic_write_lock;
289 struct mutex output_lock;
290 struct mutex echo_lock;
291 unsigned char *write_buf;
293 spinlock_t read_lock;
294 /* If the tty has a pending do_SAK, queue it here - akpm */
295 struct work_struct SAK_work;
296 struct tty_port *port;
299 /* tty magic number */
300 #define TTY_MAGIC 0x5401
303 * These bits are used in the flags field of the tty structure.
305 * So that interrupts won't be able to mess up the queues,
306 * copy_to_cooked must be atomic with respect to itself, as must
307 * tty->write. Thus, you must use the inline functions set_bit() and
308 * clear_bit() to make things atomic.
310 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
311 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
312 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
313 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
314 #define TTY_DEBUG 4 /* Debugging */
315 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
316 #define TTY_PUSH 6 /* n_tty private */
317 #define TTY_CLOSING 7 /* ->close() in progress */
318 #define TTY_LDISC 9 /* Line discipline attached */
319 #define TTY_LDISC_CHANGING 10 /* Line discipline changing */
320 #define TTY_LDISC_OPEN 11 /* Line discipline is open */
321 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
322 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
323 #define TTY_PTY_LOCK 16 /* pty private */
324 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
325 #define TTY_HUPPED 18 /* Post driver->hangup() */
326 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
327 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
329 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
331 extern void tty_write_flush(struct tty_struct *);
333 extern struct ktermios tty_std_termios;
335 extern int kmsg_redirect;
337 extern void console_init(void);
338 extern int vcs_init(void);
340 extern struct class *tty_class;
343 * tty_kref_get - get a tty reference
346 * Return a new reference to a tty object. The caller must hold
347 * sufficient locks/counts to ensure that their existing reference cannot
351 static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
354 kref_get(&tty->kref);
357 extern void tty_kref_put(struct tty_struct *tty);
359 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
360 const char *routine);
361 extern char *tty_name(struct tty_struct *tty, char *buf);
362 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
363 extern int tty_check_change(struct tty_struct *tty);
364 extern void stop_tty(struct tty_struct *tty);
365 extern void start_tty(struct tty_struct *tty);
366 extern int tty_register_driver(struct tty_driver *driver);
367 extern int tty_unregister_driver(struct tty_driver *driver);
368 extern struct device *tty_register_device(struct tty_driver *driver,
369 unsigned index, struct device *dev);
370 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
371 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
373 extern void tty_write_message(struct tty_struct *tty, char *msg);
374 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
375 extern int tty_chars_in_buffer(struct tty_struct *tty);
376 extern int tty_write_room(struct tty_struct *tty);
377 extern void tty_driver_flush_buffer(struct tty_struct *tty);
378 extern void tty_throttle(struct tty_struct *tty);
379 extern void tty_unthrottle(struct tty_struct *tty);
380 extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
381 extern void tty_shutdown(struct tty_struct *tty);
382 extern void tty_free_termios(struct tty_struct *tty);
383 extern int is_current_pgrp_orphaned(void);
384 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
385 extern int is_ignored(int sig);
386 extern int tty_signal(int sig, struct tty_struct *tty);
387 extern void tty_hangup(struct tty_struct *tty);
388 extern void tty_vhangup(struct tty_struct *tty);
389 extern void tty_vhangup_self(void);
390 extern void tty_unhangup(struct file *filp);
391 extern int tty_hung_up_p(struct file *filp);
392 extern void do_SAK(struct tty_struct *tty);
393 extern void __do_SAK(struct tty_struct *tty);
394 extern void disassociate_ctty(int priv);
395 extern void no_tty(void);
396 extern void tty_flip_buffer_push(struct tty_struct *tty);
397 extern void tty_buffer_free_all(struct tty_struct *tty);
398 extern void tty_buffer_flush(struct tty_struct *tty);
399 extern void tty_buffer_init(struct tty_struct *tty);
400 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
401 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
402 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
403 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
404 speed_t ibaud, speed_t obaud);
405 extern void tty_encode_baud_rate(struct tty_struct *tty,
406 speed_t ibaud, speed_t obaud);
407 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
408 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
410 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
411 extern void tty_ldisc_deref(struct tty_ldisc *);
412 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
413 extern void tty_ldisc_hangup(struct tty_struct *tty);
414 extern const struct file_operations tty_ldiscs_proc_fops;
416 extern void tty_wakeup(struct tty_struct *tty);
417 extern void tty_ldisc_flush(struct tty_struct *tty);
419 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
420 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
421 unsigned int cmd, unsigned long arg);
422 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
423 extern dev_t tty_devnum(struct tty_struct *tty);
424 extern void proc_clear_tty(struct task_struct *p);
425 extern struct tty_struct *get_current_tty(void);
426 extern void tty_default_fops(struct file_operations *fops);
427 extern struct tty_struct *alloc_tty_struct(void);
428 extern void free_tty_struct(struct tty_struct *tty);
429 extern void initialize_tty_struct(struct tty_struct *tty,
430 struct tty_driver *driver, int idx);
431 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
433 extern void tty_release_dev(struct file *filp);
434 extern int tty_init_termios(struct tty_struct *tty);
436 extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
437 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
439 extern struct mutex tty_mutex;
441 extern void tty_write_unlock(struct tty_struct *tty);
442 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
443 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
445 extern void tty_port_init(struct tty_port *port);
446 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
447 extern void tty_port_free_xmit_buf(struct tty_port *port);
448 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
449 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
450 extern int tty_port_carrier_raised(struct tty_port *port);
451 extern void tty_port_raise_dtr_rts(struct tty_port *port);
452 extern void tty_port_lower_dtr_rts(struct tty_port *port);
453 extern void tty_port_hangup(struct tty_port *port);
454 extern int tty_port_block_til_ready(struct tty_port *port,
455 struct tty_struct *tty, struct file *filp);
456 extern int tty_port_close_start(struct tty_port *port,
457 struct tty_struct *tty, struct file *filp);
458 extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
460 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
461 extern int tty_unregister_ldisc(int disc);
462 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
463 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
464 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
465 extern void tty_ldisc_init(struct tty_struct *tty);
466 extern void tty_ldisc_begin(void);
467 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
468 extern void tty_ldisc_enable(struct tty_struct *tty);
472 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
476 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
478 extern void tty_audit_exit(void);
479 extern void tty_audit_fork(struct signal_struct *sig);
480 extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
481 extern void tty_audit_push(struct tty_struct *tty);
482 extern void tty_audit_push_task(struct task_struct *tsk,
483 uid_t loginuid, u32 sessionid);
485 static inline void tty_audit_add_data(struct tty_struct *tty,
486 unsigned char *data, size_t size)
489 static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
492 static inline void tty_audit_exit(void)
495 static inline void tty_audit_fork(struct signal_struct *sig)
498 static inline void tty_audit_push(struct tty_struct *tty)
501 static inline void tty_audit_push_task(struct task_struct *tsk,
502 uid_t loginuid, u32 sessionid)
508 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
509 unsigned int cmd, unsigned long arg);
513 extern void serial_console_init(void);
517 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
521 extern void console_print(const char *);
525 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
526 unsigned int cmd, unsigned long arg);
528 #endif /* __KERNEL__ */