FreeBSD/Linux Kernel Cross Reference
sys/sys/tty.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Copyright (c) 2002 Networks Associates Technologies, Inc.
11 * All rights reserved.
12 *
13 * Portions of this software were developed for the FreeBSD Project by
14 * ThinkSec AS and NAI Labs, the Security Research Division of Network
15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
16 * ("CBOSS"), as part of the DARPA CHATS research program.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * @(#)tty.h 8.6 (Berkeley) 1/21/94
43 * $FreeBSD: releng/6.0/sys/sys/tty.h 136680 2004-10-18 21:51:27Z phk $
44 */
45
46 #ifndef _SYS_TTY_H_
47 #define _SYS_TTY_H_
48
49 #include <sys/termios.h>
50 #include <sys/queue.h>
51 #include <sys/selinfo.h>
52 #include <sys/_lock.h>
53 #include <sys/_mutex.h>
54
55 /*
56 * Clists are character lists, which is a variable length linked list
57 * of cblocks, with a count of the number of characters in the list.
58 */
59 struct clist {
60 int c_cc; /* Number of characters in the clist. */
61 int c_cbcount; /* Number of cblocks. */
62 int c_cbmax; /* Max # cblocks allowed for this clist. */
63 int c_cbreserved; /* # cblocks reserved for this clist. */
64 char *c_cf; /* Pointer to the first cblock. */
65 char *c_cl; /* Pointer to the last cblock. */
66 };
67
68 struct tty;
69 struct pps_state;
70 struct cdev;
71 struct cdevsw;
72
73 typedef int t_open_t(struct tty *, struct cdev *);
74 typedef void t_close_t(struct tty *);
75 typedef void t_oproc_t(struct tty *);
76 typedef void t_purge_t(struct tty *);
77 typedef void t_stop_t(struct tty *, int);
78 typedef int t_param_t(struct tty *, struct termios *);
79 typedef int t_modem_t(struct tty *, int, int);
80 typedef void t_break_t(struct tty *, int);
81 typedef int t_ioctl_t(struct tty *, u_long cmd, void * data,
82 int fflag, struct thread *td);
83 /* XXX: same as d_ioctl_t in sys/conf.h to avoid #include polution */
84 typedef int __d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td);
85
86
87
88 /*
89 * Per-tty structure.
90 *
91 * Should be split in two, into device and tty drivers.
92 * Glue could be masks of what to echo and circular buffer
93 * (low, high, timeout).
94 */
95 struct tty {
96 struct clist t_rawq; /* Device raw input queue. */
97 long t_rawcc; /* Raw input queue statistics. */
98 struct clist t_canq; /* Device canonical queue. */
99 long t_cancc; /* Canonical queue statistics. */
100 struct clist t_outq; /* Device output queue. */
101 long t_outcc; /* Output queue statistics. */
102 int t_line; /* Interface to device drivers. */
103 struct cdev *t_dev; /* Device. */
104 struct cdev *t_mdev; /* Device. */
105 u_int t_devunit; /* Cdev unit number */
106 int t_state; /* Device and driver (TS*) state. */
107 int t_flags; /* Tty flags. */
108 int t_timeout; /* Timeout for ttywait() */
109 struct pgrp *t_pgrp; /* Foreground process group. */
110 struct session *t_session; /* Enclosing session. */
111 struct sigio *t_sigio; /* Information for async I/O. */
112 struct selinfo t_rsel; /* Tty read/oob select. */
113 struct selinfo t_wsel; /* Tty write select. */
114 struct termios t_termios; /* Termios state. */
115 struct termios t_init_in; /* ... init ingoing */
116 struct termios t_init_out; /* ... outgoing */
117 struct termios t_lock_in; /* ... lock ingoing */
118 struct termios t_lock_out; /* ... outgoing */
119 struct winsize t_winsize; /* Window size. */
120 void *t_sc; /* driver private softc pointer. */
121 void *t_lsc; /* linedisc private softc pointer. */
122 int t_column; /* Tty output column. */
123 int t_rocount, t_rocol; /* Tty. */
124 int t_ififosize; /* Total size of upstream fifos. */
125 int t_ihiwat; /* High water mark for input. */
126 int t_ilowat; /* Low water mark for input. */
127 speed_t t_ispeedwat; /* t_ispeed override for watermarks. */
128 int t_ohiwat; /* High water mark for output. */
129 int t_olowat; /* Low water mark for output. */
130 speed_t t_ospeedwat; /* t_ospeed override for watermarks. */
131 int t_gen; /* Generation number. */
132 TAILQ_ENTRY(tty) t_list; /* Global chain of ttys for pstat(8) */
133 int t_actout; /* Outbound device open */
134 int t_wopeners; /* #threads waiting for DCD in open */
135
136 struct mtx t_mtx;
137 int t_refcnt;
138 int t_hotchar; /* linedisc preferred hot char */
139 int t_dtr_wait; /* Inter-session DTR holddown [hz] */
140 int t_do_timestamp; /* flag instead ? */
141 struct timeval t_timestamp; /* char timestamp */
142 struct pps_state *t_pps; /* PPS-API stuff */
143
144 /* Driver supplied methods */
145 t_oproc_t *t_oproc; /* Start output. */
146 t_stop_t *t_stop; /* Stop output. */
147 t_param_t *t_param; /* Set parameters. */
148 t_modem_t *t_modem; /* Set modem state (optional). */
149 t_break_t *t_break; /* Set break state (optional). */
150 t_ioctl_t *t_ioctl; /* Set ioctl handling (optional). */
151 t_open_t *t_open; /* First open */
152 t_purge_t *t_purge; /* Purge threads */
153 t_close_t *t_close; /* Last close */
154 __d_ioctl_t *t_cioctl; /* Ioctl on control devices */
155 };
156
157 #define t_cc t_termios.c_cc
158 #define t_cflag t_termios.c_cflag
159 #define t_iflag t_termios.c_iflag
160 #define t_ispeed t_termios.c_ispeed
161 #define t_lflag t_termios.c_lflag
162 #define t_min t_termios.c_min
163 #define t_oflag t_termios.c_oflag
164 #define t_ospeed t_termios.c_ospeed
165 #define t_time t_termios.c_time
166
167 #define TTIPRI (PSOCK + 1) /* Sleep priority for tty reads. */
168 #define TTOPRI (PSOCK + 2) /* Sleep priority for tty writes. */
169
170 /*
171 * Userland version of struct tty, for sysctl.
172 */
173 struct xtty {
174 size_t xt_size; /* Structure size. */
175 long xt_rawcc; /* Raw input queue statistics. */
176 long xt_cancc; /* Canonical queue statistics. */
177 long xt_outcc; /* Output queue statistics. */
178 int xt_line; /* Interface to device drivers. */
179 dev_t xt_dev; /* Userland (sysctl) instance. */
180 int xt_state; /* Device and driver (TS*) state. */
181 int xt_flags; /* Tty flags. */
182 int xt_timeout; /* Timeout for ttywait(). */
183 pid_t xt_pgid; /* Process group ID. */
184 pid_t xt_sid; /* Session ID. */
185 struct termios xt_termios; /* Termios state. */
186 struct winsize xt_winsize; /* Window size. */
187 int xt_column; /* Tty output column. */
188 int xt_rocount, xt_rocol; /* Tty. */
189 int xt_ififosize; /* Total size of upstream fifos. */
190 int xt_ihiwat; /* High water mark for input. */
191 int xt_ilowat; /* Low water mark for input. */
192 speed_t xt_ispeedwat; /* t_ispeed override for watermarks. */
193 int xt_ohiwat; /* High water mark for output. */
194 int xt_olowat; /* Low water mark for output. */
195 speed_t xt_ospeedwat; /* t_ospeed override for watermarks. */
196 };
197
198 /*
199 * User data unfortunately has to be copied through buffers on the way to
200 * and from clists. The buffers are on the stack so their sizes must be
201 * fairly small.
202 */
203 #define IBUFSIZ 384 /* Should be >= max value of MIN. */
204 #define OBUFSIZ 100
205
206 #ifndef TTYHOG
207 #define TTYHOG 8192
208 #endif
209
210 #ifdef _KERNEL
211 #define TTMAXHIWAT roundup(2048, CBSIZE)
212 #define TTMINHIWAT roundup(100, CBSIZE)
213 #define TTMAXLOWAT 256
214 #define TTMINLOWAT 32
215 #endif
216
217 /* These flags are kept in t_state. */
218 #define TS_SO_OLOWAT 0x00001 /* Wake up when output <= low water. */
219 #define TS_ASYNC 0x00002 /* Tty in async I/O mode. */
220 #define TS_BUSY 0x00004 /* Draining output. */
221 #define TS_CARR_ON 0x00008 /* Carrier is present. */
222 #define TS_FLUSH 0x00010 /* Outq has been flushed during DMA. */
223 #define TS_ISOPEN 0x00020 /* Open has completed. */
224 #define TS_TBLOCK 0x00040 /* Further input blocked. */
225 #define TS_TIMEOUT 0x00080 /* Wait for output char processing. */
226 #define TS_TTSTOP 0x00100 /* Output paused. */
227 #ifdef notyet
228 #define TS_WOPEN 0x00200 /* Open in progress. */
229 #endif
230 #define TS_XCLUDE 0x00400 /* Tty requires exclusivity. */
231
232 /* State for intra-line fancy editing work. */
233 #define TS_BKSL 0x00800 /* State for lowercase \ work. */
234 #define TS_CNTTB 0x01000 /* Counting tab width, ignore FLUSHO. */
235 #define TS_ERASE 0x02000 /* Within a \.../ for PRTRUB. */
236 #define TS_LNCH 0x04000 /* Next character is literal. */
237 #define TS_TYPEN 0x08000 /* Retyping suspended input (PENDIN). */
238 #define TS_LOCAL (TS_BKSL | TS_CNTTB | TS_ERASE | TS_LNCH | TS_TYPEN)
239
240 /* Extras. */
241 #define TS_CAN_BYPASS_L_RINT 0x010000 /* Device in "raw" mode. */
242 #define TS_CONNECTED 0x020000 /* Connection open. */
243 #define TS_SNOOP 0x040000 /* Device is being snooped on. */
244 #define TS_SO_OCOMPLETE 0x080000 /* Wake up when output completes. */
245 #define TS_ZOMBIE 0x100000 /* Connection lost. */
246
247 /* Hardware flow-control-invoked bits. */
248 #define TS_CAR_OFLOW 0x200000 /* For MDMBUF (XXX handle in driver). */
249 #ifdef notyet
250 #define TS_CTS_OFLOW 0x400000 /* For CCTS_OFLOW. */
251 #define TS_DSR_OFLOW 0x800000 /* For CDSR_OFLOW. */
252 #endif
253
254 #define TS_DTR_WAIT 0x1000000 /* DTR hold-down between sessions */
255 #define TS_GONE 0x2000000 /* Hardware detached */
256
257 /* Character type information. */
258 #define ORDINARY 0
259 #define CONTROL 1
260 #define BACKSPACE 2
261 #define NEWLINE 3
262 #define TAB 4
263 #define VTAB 5
264 #define RETURN 6
265
266 struct speedtab {
267 int sp_speed; /* Speed. */
268 int sp_code; /* Code. */
269 };
270
271 /* Modem control commands (driver). */
272 #define DMSET 0
273 #define DMBIS 1
274 #define DMBIC 2
275 #define DMGET 3
276
277 /* Flags on a character passed to ttyinput. */
278 #define TTY_CHARMASK 0x000000ff /* Character mask */
279 #define TTY_QUOTE 0x00000100 /* Character quoted */
280 #define TTY_ERRORMASK 0xff000000 /* Error mask */
281 #define TTY_FE 0x01000000 /* Framing error */
282 #define TTY_PE 0x02000000 /* Parity error */
283 #define TTY_OE 0x04000000 /* Overrun error */
284 #define TTY_BI 0x08000000 /* Break condition */
285
286 /* Is tp controlling terminal for p? */
287 #define isctty(p, tp) \
288 ((p)->p_session == (tp)->t_session && (p)->p_flag & P_CONTROLT)
289
290 /* Is p in background of tp? */
291 #define isbackground(p, tp) \
292 (isctty((p), (tp)) && (p)->p_pgrp != (tp)->t_pgrp)
293
294 /* Unique sleep addresses. */
295 #define TSA_CARR_ON(tp) ((void *)&(tp)->t_rawq)
296 #define TSA_HUP_OR_INPUT(tp) ((void *)&(tp)->t_rawq.c_cf)
297 #define TSA_OCOMPLETE(tp) ((void *)&(tp)->t_outq.c_cl)
298 #define TSA_OLOWAT(tp) ((void *)&(tp)->t_outq)
299
300 #ifdef _KERNEL
301 #ifdef MALLOC_DECLARE
302 MALLOC_DECLARE(M_TTYS);
303 #endif
304
305 /* Minor number flag bits */
306 #define MINOR_CALLOUT 0x80000000
307 #define MINOR_INIT 0x40000000
308 #define MINOR_LOCK 0x20000000
309
310 #define ISCALLOUT(dev) (minor(dev) & MINOR_CALLOUT)
311 #define ISINIT(dev) (minor(dev) & MINOR_INIT)
312 #define ISLOCK(dev) (minor(dev) & MINOR_LOCK)
313
314 extern struct msgbuf consmsgbuf; /* Message buffer for constty. */
315 extern struct tty *constty; /* Temporary virtual console. */
316 extern long tk_cancc;
317 extern long tk_nin;
318 extern long tk_nout;
319 extern long tk_rawcc;
320
321 int b_to_q(char *cp, int cc, struct clist *q);
322 void catq(struct clist *from, struct clist *to);
323 void clist_alloc_cblocks(struct clist *q, int ccmax, int ccres);
324 void clist_free_cblocks(struct clist *q);
325 void constty_set(struct tty *tp);
326 void constty_clear(void);
327 int getc(struct clist *q);
328 void ndflush(struct clist *q, int cc);
329 char *nextc(struct clist *q, char *cp, int *c);
330 void nottystop(struct tty *tp, int rw);
331 int putc(int c, struct clist *q);
332 int q_to_b(struct clist *q, char *cp, int cc);
333 void termioschars(struct termios *t);
334 int tputchar(int c, struct tty *tp);
335 int ttcompat(struct tty *tp, u_long com, caddr_t data, int flag);
336 int ttioctl(struct tty *tp, u_long com, void *data, int flag);
337 int ttread(struct tty *tp, struct uio *uio, int flag);
338 void ttrstrt(void *tp);
339 int ttsetcompat(struct tty *tp, u_long *com, caddr_t data,
340 struct termios *term);
341 void ttsetwater(struct tty *tp);
342 int ttspeedtab(int speed, struct speedtab *table);
343 int ttstart(struct tty *tp);
344 void ttwakeup(struct tty *tp);
345 int ttwrite(struct tty *tp, struct uio *uio, int flag);
346 void ttwwakeup(struct tty *tp);
347 struct tty *ttyalloc(void);
348 void ttyblock(struct tty *tp);
349 void ttychars(struct tty *tp);
350 int ttycheckoutq(struct tty *tp, int wait);
351 void ttyconsolemode(struct tty *tp, int speed);
352 int tty_close(struct tty *tp);
353 int ttycreate(struct tty *tp, struct cdevsw *, int unit, int flags, const char *fmt, ...) __printflike(5, 6);
354 int ttydtrwaitsleep(struct tty *tp);
355 void ttydtrwaitstart(struct tty *tp);
356 void ttyflush(struct tty *tp, int rw);
357 void ttyfree(struct tty *tp);
358 void ttygone(struct tty *tp);
359 void ttyinfo(struct tty *tp);
360 void ttyinitmode(struct tty *tp, int echo, int speed);
361 int ttyinput(int c, struct tty *tp);
362 int ttylclose(struct tty *tp, int flag);
363 void ttyldoptim(struct tty *tp);
364 struct tty *ttymalloc(struct tty *tp);
365 int ttymodem(struct tty *tp, int flag);
366 int tty_open(struct cdev *device, struct tty *tp);
367 int ttyref(struct tty *tp);
368 int ttyrel(struct tty *tp);
369 int ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo);
370 int ttywait(struct tty *tp);
371 int unputc(struct clist *q);
372
373 /*
374 * XXX: temporary
375 */
376 #include <sys/linedisc.h>
377
378 #endif /* _KERNEL */
379
380 #endif /* !_SYS_TTY_H_ */
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