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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_TTY_H
2#define _LINUX_TTY_H
3
4/*
5 * 'tty.h' defines some structures used by tty_io.c and some defines.
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/fs.h>
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>
Ingo Molnar70522e12006-03-23 03:00:31 -080015#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include <asm/system.h>
18
19
20/*
21 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
22 * hardcoded at present.)
23 */
24#define NR_PTYS CONFIG_LEGACY_PTY_COUNT /* Number of legacy ptys */
25#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
26#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
27#define NR_LDISCS 16
28
29/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 * This character is the same as _POSIX_VDISABLE: it cannot be used as
31 * a c_cc[] character, but indicates that a particular special character
32 * isn't in use (eg VINTR has no character etc)
33 */
34#define __DISABLED_CHAR '\0'
35
36/*
37 * This is the flip buffer used for the tty driver. The buffer is
38 * located in the tty structure, and is used as a high speed interface
39 * between the tty driver and the tty line discipline.
40 */
41#define TTY_FLIPBUF_SIZE 512
42
Alan Cox33f0f882006-01-09 20:54:13 -080043struct tty_buffer {
44 struct tty_buffer *next;
45 char *char_buf_ptr;
46 unsigned char *flag_buf_ptr;
47 int used;
48 int size;
Paul Fulghum8977d922006-02-10 01:51:14 -080049 int commit;
50 int read;
Alan Cox33f0f882006-01-09 20:54:13 -080051 /* Data points here */
52 unsigned long data[0];
53};
54
55struct tty_bufhead {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 struct work_struct work;
57 struct semaphore pty_sem;
Paul Fulghum808249c2006-02-03 03:04:41 -080058 spinlock_t lock;
Alan Cox33f0f882006-01-09 20:54:13 -080059 struct tty_buffer *head; /* Queue head */
60 struct tty_buffer *tail; /* Active buffer */
61 struct tty_buffer *free; /* Free queue head */
Alan Cox01da5fd2006-08-27 01:24:02 -070062 int memory_used; /* Buffer space used excluding free queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64/*
65 * The pty uses char_buf and flag_buf as a contiguous buffer
66 */
67#define PTY_BUF_SIZE 4*TTY_FLIPBUF_SIZE
68
69/*
70 * When a break, frame error, or parity error happens, these codes are
71 * stuffed into the flags buffer.
72 */
73#define TTY_NORMAL 0
74#define TTY_BREAK 1
75#define TTY_FRAME 2
76#define TTY_PARITY 3
77#define TTY_OVERRUN 4
78
79#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
80#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
81#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
82#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
83#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
84#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
85#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
86#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
87#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
88#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
89#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
90#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
91#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
92#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
93#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
94#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
95#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
96
97#define _I_FLAG(tty,f) ((tty)->termios->c_iflag & (f))
98#define _O_FLAG(tty,f) ((tty)->termios->c_oflag & (f))
99#define _C_FLAG(tty,f) ((tty)->termios->c_cflag & (f))
100#define _L_FLAG(tty,f) ((tty)->termios->c_lflag & (f))
101
102#define I_IGNBRK(tty) _I_FLAG((tty),IGNBRK)
103#define I_BRKINT(tty) _I_FLAG((tty),BRKINT)
104#define I_IGNPAR(tty) _I_FLAG((tty),IGNPAR)
105#define I_PARMRK(tty) _I_FLAG((tty),PARMRK)
106#define I_INPCK(tty) _I_FLAG((tty),INPCK)
107#define I_ISTRIP(tty) _I_FLAG((tty),ISTRIP)
108#define I_INLCR(tty) _I_FLAG((tty),INLCR)
109#define I_IGNCR(tty) _I_FLAG((tty),IGNCR)
110#define I_ICRNL(tty) _I_FLAG((tty),ICRNL)
111#define I_IUCLC(tty) _I_FLAG((tty),IUCLC)
112#define I_IXON(tty) _I_FLAG((tty),IXON)
113#define I_IXANY(tty) _I_FLAG((tty),IXANY)
114#define I_IXOFF(tty) _I_FLAG((tty),IXOFF)
115#define I_IMAXBEL(tty) _I_FLAG((tty),IMAXBEL)
116#define I_IUTF8(tty) _I_FLAG((tty),IUTF8)
117
118#define O_OPOST(tty) _O_FLAG((tty),OPOST)
119#define O_OLCUC(tty) _O_FLAG((tty),OLCUC)
120#define O_ONLCR(tty) _O_FLAG((tty),ONLCR)
121#define O_OCRNL(tty) _O_FLAG((tty),OCRNL)
122#define O_ONOCR(tty) _O_FLAG((tty),ONOCR)
123#define O_ONLRET(tty) _O_FLAG((tty),ONLRET)
124#define O_OFILL(tty) _O_FLAG((tty),OFILL)
125#define O_OFDEL(tty) _O_FLAG((tty),OFDEL)
126#define O_NLDLY(tty) _O_FLAG((tty),NLDLY)
127#define O_CRDLY(tty) _O_FLAG((tty),CRDLY)
128#define O_TABDLY(tty) _O_FLAG((tty),TABDLY)
129#define O_BSDLY(tty) _O_FLAG((tty),BSDLY)
130#define O_VTDLY(tty) _O_FLAG((tty),VTDLY)
131#define O_FFDLY(tty) _O_FLAG((tty),FFDLY)
132
133#define C_BAUD(tty) _C_FLAG((tty),CBAUD)
134#define C_CSIZE(tty) _C_FLAG((tty),CSIZE)
135#define C_CSTOPB(tty) _C_FLAG((tty),CSTOPB)
136#define C_CREAD(tty) _C_FLAG((tty),CREAD)
137#define C_PARENB(tty) _C_FLAG((tty),PARENB)
138#define C_PARODD(tty) _C_FLAG((tty),PARODD)
139#define C_HUPCL(tty) _C_FLAG((tty),HUPCL)
140#define C_CLOCAL(tty) _C_FLAG((tty),CLOCAL)
141#define C_CIBAUD(tty) _C_FLAG((tty),CIBAUD)
142#define C_CRTSCTS(tty) _C_FLAG((tty),CRTSCTS)
143
144#define L_ISIG(tty) _L_FLAG((tty),ISIG)
145#define L_ICANON(tty) _L_FLAG((tty),ICANON)
146#define L_XCASE(tty) _L_FLAG((tty),XCASE)
147#define L_ECHO(tty) _L_FLAG((tty),ECHO)
148#define L_ECHOE(tty) _L_FLAG((tty),ECHOE)
149#define L_ECHOK(tty) _L_FLAG((tty),ECHOK)
150#define L_ECHONL(tty) _L_FLAG((tty),ECHONL)
151#define L_NOFLSH(tty) _L_FLAG((tty),NOFLSH)
152#define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP)
153#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
154#define L_ECHOPRT(tty) _L_FLAG((tty),ECHOPRT)
155#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
156#define L_FLUSHO(tty) _L_FLAG((tty),FLUSHO)
157#define L_PENDIN(tty) _L_FLAG((tty),PENDIN)
158#define L_IEXTEN(tty) _L_FLAG((tty),IEXTEN)
159
160struct device;
161/*
162 * Where all of the state associated with a tty is kept while the tty
163 * is open. Since the termios state should be kept even if the tty
164 * has been closed --- for things like the baud rate, etc --- it is
165 * not stored here, but rather a pointer to the real state is stored
166 * here. Possible the winsize structure should have the same
167 * treatment, but (1) the default 80x24 is usually right and (2) it's
168 * most often used by a windowing system, which will set the correct
169 * size each time the window is created or resized anyway.
170 * - TYT, 9/14/92
171 */
172struct tty_struct {
173 int magic;
174 struct tty_driver *driver;
175 int index;
176 struct tty_ldisc ldisc;
177 struct semaphore termios_sem;
178 struct termios *termios, *termios_locked;
179 char name[64];
180 int pgrp;
181 int session;
182 unsigned long flags;
183 int count;
184 struct winsize winsize;
185 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
186 unsigned char low_latency:1, warned:1;
187 unsigned char ctrl_status;
Alan Cox33f0f882006-01-09 20:54:13 -0800188 unsigned int receive_room; /* Bytes free for queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190 struct tty_struct *link;
191 struct fasync_struct *fasync;
Alan Cox33f0f882006-01-09 20:54:13 -0800192 struct tty_bufhead buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 int max_flip_cnt;
194 int alt_speed; /* For magic substitution of 38400 bps */
195 wait_queue_head_t write_wait;
196 wait_queue_head_t read_wait;
197 struct work_struct hangup_work;
198 void *disc_data;
199 void *driver_data;
200 struct list_head tty_files;
201
202#define N_TTY_BUF_SIZE 4096
203
204 /*
205 * The following is data for the N_TTY line discipline. For
206 * historical reasons, this is included in the tty structure.
207 */
208 unsigned int column;
209 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
210 unsigned char closing:1;
211 unsigned short minimum_to_wake;
212 unsigned long overrun_time;
213 int num_overrun;
214 unsigned long process_char_map[256/(8*sizeof(unsigned long))];
215 char *read_buf;
216 int read_head;
217 int read_tail;
218 int read_cnt;
219 unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
220 int canon_data;
221 unsigned long canon_head;
222 unsigned int canon_column;
Ingo Molnar70522e12006-03-23 03:00:31 -0800223 struct mutex atomic_read_lock;
224 struct mutex atomic_write_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 unsigned char *write_buf;
226 int write_cnt;
227 spinlock_t read_lock;
228 /* If the tty has a pending do_SAK, queue it here - akpm */
229 struct work_struct SAK_work;
230};
231
232/* tty magic number */
233#define TTY_MAGIC 0x5401
234
235/*
236 * These bits are used in the flags field of the tty structure.
237 *
238 * So that interrupts won't be able to mess up the queues,
239 * copy_to_cooked must be atomic with respect to itself, as must
240 * tty->write. Thus, you must use the inline functions set_bit() and
241 * clear_bit() to make things atomic.
242 */
243#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
244#define TTY_IO_ERROR 1 /* Canse an I/O error (may be no ldisc too) */
245#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
246#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
247#define TTY_DEBUG 4 /* Debugging */
248#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
249#define TTY_PUSH 6 /* n_tty private */
250#define TTY_CLOSING 7 /* ->close() in progress */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251#define TTY_LDISC 9 /* Line discipline attached */
252#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
253#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
254#define TTY_PTY_LOCK 16 /* pty private */
255#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
256#define TTY_HUPPED 18 /* Post driver->hangup() */
257
258#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
259
260extern void tty_write_flush(struct tty_struct *);
261
262extern struct termios tty_std_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264extern int kmsg_redirect;
265
266extern void console_init(void);
267extern int vcs_init(void);
268
269extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
270 const char *routine);
271extern char *tty_name(struct tty_struct *tty, char *buf);
272extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
273extern int tty_check_change(struct tty_struct * tty);
274extern void stop_tty(struct tty_struct * tty);
275extern void start_tty(struct tty_struct * tty);
276extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
Alexey Dobriyanbfb07592005-06-23 00:10:32 -0700277extern int tty_unregister_ldisc(int disc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278extern int tty_register_driver(struct tty_driver *driver);
279extern int tty_unregister_driver(struct tty_driver *driver);
Hansjoerg Lipp1cdcb6b2006-04-22 18:36:53 +0200280extern struct class_device *tty_register_device(struct tty_driver *driver,
281 unsigned index,
282 struct device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
284extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
285 int buflen);
286extern void tty_write_message(struct tty_struct *tty, char *msg);
287
288extern int is_orphaned_pgrp(int pgrp);
289extern int is_ignored(int sig);
290extern int tty_signal(int sig, struct tty_struct *tty);
291extern void tty_hangup(struct tty_struct * tty);
292extern void tty_vhangup(struct tty_struct * tty);
293extern void tty_unhangup(struct file *filp);
294extern int tty_hung_up_p(struct file * filp);
295extern void do_SAK(struct tty_struct *tty);
296extern void disassociate_ctty(int priv);
297extern void tty_flip_buffer_push(struct tty_struct *tty);
298extern int tty_get_baud_rate(struct tty_struct *tty);
299extern int tty_termios_baud_rate(struct termios *termios);
300
301extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
302extern void tty_ldisc_deref(struct tty_ldisc *);
303extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
304
305extern struct tty_ldisc *tty_ldisc_get(int);
306extern void tty_ldisc_put(int);
307
308extern void tty_wakeup(struct tty_struct *tty);
309extern void tty_ldisc_flush(struct tty_struct *tty);
310
Ingo Molnar70522e12006-03-23 03:00:31 -0800311extern struct mutex tty_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313/* n_tty.c */
314extern struct tty_ldisc tty_ldisc_N_TTY;
315
316/* tty_ioctl.c */
317extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
318 unsigned int cmd, unsigned long arg);
319
320/* serial.c */
321
322extern void serial_console_init(void);
323
324/* pcxx.c */
325
326extern int pcxe_open(struct tty_struct *tty, struct file *filp);
327
328/* printk.c */
329
330extern void console_print(const char *);
331
332/* vt.c */
333
334extern int vt_ioctl(struct tty_struct *tty, struct file * file,
335 unsigned int cmd, unsigned long arg);
336
337static inline dev_t tty_devnum(struct tty_struct *tty)
338{
339 return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
340}
341
342#endif /* __KERNEL__ */
343#endif