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 */
50 * This character is the same as _POSIX_VDISABLE: it cannot be used as
51 * a c_cc[] character, but indicates that a particular special character
52 * isn't in use (eg VINTR has no character etc)
54 #define __DISABLED_CHAR '\0'
57 struct tty_buffer *next;
59 unsigned char *flag_buf_ptr;
64 /* Data points here */
65 unsigned long data[0];
69 struct delayed_work work;
71 struct tty_buffer *head; /* Queue head */
72 struct tty_buffer *tail; /* Active buffer */
73 struct tty_buffer *free; /* Free queue head */
74 int memory_used; /* Buffer space used excluding
78 * When a break, frame error, or parity error happens, these codes are
79 * stuffed into the flags buffer.
87 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
88 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
89 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
90 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
91 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
92 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
93 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
94 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
95 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
96 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
97 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
98 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
99 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
100 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
101 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
102 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
103 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
105 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
106 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
107 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
108 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
110 #define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
111 #define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
112 #define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
113 #define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
114 #define I_INPCK(tty) _I_FLAG((tty), INPCK)
115 #define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
116 #define I_INLCR(tty) _I_FLAG((tty), INLCR)
117 #define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
118 #define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
119 #define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
120 #define I_IXON(tty) _I_FLAG((tty), IXON)
121 #define I_IXANY(tty) _I_FLAG((tty), IXANY)
122 #define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
123 #define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
124 #define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
126 #define O_OPOST(tty) _O_FLAG((tty), OPOST)
127 #define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
128 #define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
129 #define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
130 #define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
131 #define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
132 #define O_OFILL(tty) _O_FLAG((tty), OFILL)
133 #define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
134 #define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
135 #define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
136 #define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
137 #define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
138 #define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
139 #define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
141 #define C_BAUD(tty) _C_FLAG((tty), CBAUD)
142 #define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
143 #define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
144 #define C_CREAD(tty) _C_FLAG((tty), CREAD)
145 #define C_PARENB(tty) _C_FLAG((tty), PARENB)
146 #define C_PARODD(tty) _C_FLAG((tty), PARODD)
147 #define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
148 #define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
149 #define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
150 #define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
152 #define L_ISIG(tty) _L_FLAG((tty), ISIG)
153 #define L_ICANON(tty) _L_FLAG((tty), ICANON)
154 #define L_XCASE(tty) _L_FLAG((tty), XCASE)
155 #define L_ECHO(tty) _L_FLAG((tty), ECHO)
156 #define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
157 #define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
158 #define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
159 #define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
160 #define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
161 #define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
162 #define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
163 #define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
164 #define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
165 #define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
166 #define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
169 struct signal_struct;
172 * Port level information. Each device keeps its own port level information
173 * so provide a common structure for those ports wanting to use common support
176 * The tty port has a different lifetime to the tty so must be kept apart.
177 * In addition be careful as tty -> port mappings are valid for the life
178 * of the tty object but in many cases port -> tty mappings are valid only
179 * until a hangup so don't use the wrong path.
183 struct tty_struct *tty; /* Back pointer */
184 int blocked_open; /* Waiting to open */
185 int count; /* Usage count */
186 wait_queue_head_t open_wait; /* Open waiters */
187 wait_queue_head_t close_wait; /* Close waiters */
188 unsigned long flags; /* TTY flags ASY_*/
189 struct mutex mutex; /* Locking */
190 unsigned char *xmit_buf; /* Optional buffer */
191 int close_delay; /* Close port delay */
192 int closing_wait; /* Delay for output */
196 * Where all of the state associated with a tty is kept while the tty
197 * is open. Since the termios state should be kept even if the tty
198 * has been closed --- for things like the baud rate, etc --- it is
199 * not stored here, but rather a pointer to the real state is stored
200 * here. Possible the winsize structure should have the same
201 * treatment, but (1) the default 80x24 is usually right and (2) it's
202 * most often used by a windowing system, which will set the correct
203 * size each time the window is created or resized anyway.
207 struct tty_operations;
211 struct tty_driver *driver;
212 const struct tty_operations *ops;
214 /* The ldisc objects are protected by tty_ldisc_lock at the moment */
215 struct tty_ldisc ldisc;
216 struct mutex termios_mutex;
217 spinlock_t ctrl_lock;
218 /* Termios values are protected by the termios mutex */
219 struct ktermios *termios, *termios_locked;
221 struct pid *pgrp; /* Protected by ctrl lock */
225 struct winsize winsize; /* termios mutex */
226 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
227 unsigned char low_latency:1, warned:1;
228 unsigned char ctrl_status; /* ctrl_lock */
229 unsigned int receive_room; /* Bytes free for queue */
231 struct tty_struct *link;
232 struct fasync_struct *fasync;
233 struct tty_bufhead buf; /* Locked internally */
234 int alt_speed; /* For magic substitution of 38400 bps */
235 wait_queue_head_t write_wait;
236 wait_queue_head_t read_wait;
237 struct work_struct hangup_work;
240 struct list_head tty_files;
242 #define N_TTY_BUF_SIZE 4096
245 * The following is data for the N_TTY line discipline. For
246 * historical reasons, this is included in the tty structure.
247 * Mostly locked by the BKL.
250 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
251 unsigned char closing:1;
252 unsigned short minimum_to_wake;
253 unsigned long overrun_time;
255 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
260 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
262 unsigned long canon_head;
263 unsigned int canon_column;
264 struct mutex atomic_read_lock;
265 struct mutex atomic_write_lock;
266 unsigned char *write_buf;
268 spinlock_t read_lock;
269 /* If the tty has a pending do_SAK, queue it here - akpm */
270 struct work_struct SAK_work;
271 struct tty_port *port;
274 /* tty magic number */
275 #define TTY_MAGIC 0x5401
278 * These bits are used in the flags field of the tty structure.
280 * So that interrupts won't be able to mess up the queues,
281 * copy_to_cooked must be atomic with respect to itself, as must
282 * tty->write. Thus, you must use the inline functions set_bit() and
283 * clear_bit() to make things atomic.
285 #define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
286 #define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
287 #define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
288 #define TTY_EXCLUSIVE 3 /* Exclusive open mode */
289 #define TTY_DEBUG 4 /* Debugging */
290 #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
291 #define TTY_PUSH 6 /* n_tty private */
292 #define TTY_CLOSING 7 /* ->close() in progress */
293 #define TTY_LDISC 9 /* Line discipline attached */
294 #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
295 #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
296 #define TTY_PTY_LOCK 16 /* pty private */
297 #define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
298 #define TTY_HUPPED 18 /* Post driver->hangup() */
299 #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
300 #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
302 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
304 extern void tty_write_flush(struct tty_struct *);
306 extern struct ktermios tty_std_termios;
308 extern int kmsg_redirect;
310 extern void console_init(void);
311 extern int vcs_init(void);
313 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
314 const char *routine);
315 extern char *tty_name(struct tty_struct *tty, char *buf);
316 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
317 extern int tty_check_change(struct tty_struct *tty);
318 extern void stop_tty(struct tty_struct *tty);
319 extern void start_tty(struct tty_struct *tty);
320 extern int tty_register_driver(struct tty_driver *driver);
321 extern int tty_unregister_driver(struct tty_driver *driver);
322 extern struct device *tty_register_device(struct tty_driver *driver,
323 unsigned index, struct device *dev);
324 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
325 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
327 extern void tty_write_message(struct tty_struct *tty, char *msg);
328 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
329 extern int tty_chars_in_buffer(struct tty_struct *tty);
330 extern int tty_write_room(struct tty_struct *tty);
331 extern void tty_driver_flush_buffer(struct tty_struct *tty);
332 extern void tty_throttle(struct tty_struct *tty);
333 extern void tty_unthrottle(struct tty_struct *tty);
334 extern int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
337 extern int is_current_pgrp_orphaned(void);
338 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
339 extern int is_ignored(int sig);
340 extern int tty_signal(int sig, struct tty_struct *tty);
341 extern void tty_hangup(struct tty_struct *tty);
342 extern void tty_vhangup(struct tty_struct *tty);
343 extern void tty_unhangup(struct file *filp);
344 extern int tty_hung_up_p(struct file *filp);
345 extern void do_SAK(struct tty_struct *tty);
346 extern void __do_SAK(struct tty_struct *tty);
347 extern void disassociate_ctty(int priv);
348 extern void no_tty(void);
349 extern void tty_flip_buffer_push(struct tty_struct *tty);
350 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
351 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
352 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
353 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
354 speed_t ibaud, speed_t obaud);
355 extern void tty_encode_baud_rate(struct tty_struct *tty,
356 speed_t ibaud, speed_t obaud);
357 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
358 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
360 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
361 extern void tty_ldisc_deref(struct tty_ldisc *);
362 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
363 extern const struct file_operations tty_ldiscs_proc_fops;
365 extern void tty_wakeup(struct tty_struct *tty);
366 extern void tty_ldisc_flush(struct tty_struct *tty);
368 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
369 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
370 unsigned int cmd, unsigned long arg);
371 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
372 extern dev_t tty_devnum(struct tty_struct *tty);
373 extern void proc_clear_tty(struct task_struct *p);
374 extern struct tty_struct *get_current_tty(void);
376 extern struct mutex tty_mutex;
378 extern void tty_write_unlock(struct tty_struct *tty);
379 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
380 #define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
382 extern void tty_port_init(struct tty_port *port);
383 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
384 extern void tty_port_free_xmit_buf(struct tty_port *port);
386 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
387 extern int tty_unregister_ldisc(int disc);
388 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
389 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
390 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
391 extern void tty_ldisc_init(struct tty_struct *tty);
392 extern void tty_ldisc_begin(void);
393 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
394 extern void tty_ldisc_enable(struct tty_struct *tty);
398 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
402 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
404 extern void tty_audit_exit(void);
405 extern void tty_audit_fork(struct signal_struct *sig);
406 extern void tty_audit_push(struct tty_struct *tty);
407 extern void tty_audit_push_task(struct task_struct *tsk,
408 uid_t loginuid, u32 sessionid);
410 static inline void tty_audit_add_data(struct tty_struct *tty,
411 unsigned char *data, size_t size)
414 static inline void tty_audit_exit(void)
417 static inline void tty_audit_fork(struct signal_struct *sig)
420 static inline void tty_audit_push(struct tty_struct *tty)
423 static inline void tty_audit_push_task(struct task_struct *tsk,
424 uid_t loginuid, u32 sessionid)
430 extern int n_tty_ioctl(struct tty_struct *tty, struct file *file,
431 unsigned int cmd, unsigned long arg);
435 extern void serial_console_init(void);
439 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
443 extern void console_print(const char *);
447 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
448 unsigned int cmd, unsigned long arg);
450 #endif /* __KERNEL__ */