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 * 3. All advertising materials mentioning features or use of this software
27 * must display the following acknowledgement:
28 * This product includes software developed by the University of
29 * California, Berkeley and its contributors.
30 * 4. Neither the name of the University nor the names of its contributors
31 * may be used to endorse or promote products derived from this software
32 * without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * SUCH DAMAGE.
45 *
46 * @(#)tty.h 8.6 (Berkeley) 1/21/94
47 * $FreeBSD: releng/5.2/sys/sys/tty.h 116663 2003-06-22 02:54:33Z iedowse $
48 */
49
50 #ifndef _SYS_TTY_H_
51 #define _SYS_TTY_H_
52
53 #include <sys/termios.h>
54 #include <sys/queue.h>
55 #include <sys/selinfo.h>
56
57 /*
58 * Clists are character lists, which is a variable length linked list
59 * of cblocks, with a count of the number of characters in the list.
60 */
61 struct clist {
62 int c_cc; /* Number of characters in the clist. */
63 int c_cbcount; /* Number of cblocks. */
64 int c_cbmax; /* Max # cblocks allowed for this clist. */
65 int c_cbreserved; /* # cblocks reserved for this clist. */
66 char *c_cf; /* Pointer to the first cblock. */
67 char *c_cl; /* Pointer to the last cblock. */
68 };
69
70 /*
71 * Per-tty structure.
72 *
73 * Should be split in two, into device and tty drivers.
74 * Glue could be masks of what to echo and circular buffer
75 * (low, high, timeout).
76 */
77 struct tty {
78 struct clist t_rawq; /* Device raw input queue. */
79 long t_rawcc; /* Raw input queue statistics. */
80 struct clist t_canq; /* Device canonical queue. */
81 long t_cancc; /* Canonical queue statistics. */
82 struct clist t_outq; /* Device output queue. */
83 long t_outcc; /* Output queue statistics. */
84 int t_line; /* Interface to device drivers. */
85 union {
86 dev_t t_kdev; /* Device. */
87 udev_t t_udev; /* Userland (sysctl) instance. */
88 void *t_devp; /* Keep user/kernel size in sync. */
89 } ttyu;
90 int t_state; /* Device and driver (TS*) state. */
91 int t_flags; /* Tty flags. */
92 int t_timeout; /* Timeout for ttywait() */
93 struct pgrp *t_pgrp; /* Foreground process group. */
94 struct session *t_session; /* Enclosing session. */
95 struct sigio *t_sigio; /* Information for async I/O. */
96 struct selinfo t_rsel; /* Tty read/oob select. */
97 struct selinfo t_wsel; /* Tty write select. */
98 struct termios t_termios; /* Termios state. */
99 struct winsize t_winsize; /* Window size. */
100 /* Start output. */
101 void (*t_oproc)(struct tty *);
102 /* Stop output. */
103 void (*t_stop)(struct tty *, int);
104 /* Set hardware state. */
105 int (*t_param)(struct tty *, struct termios *);
106 void *t_sc; /* XXX: net/if_sl.c:sl_softc. */
107 int t_column; /* Tty output column. */
108 int t_rocount, t_rocol; /* Tty. */
109 int t_ififosize; /* Total size of upstream fifos. */
110 int t_ihiwat; /* High water mark for input. */
111 int t_ilowat; /* Low water mark for input. */
112 speed_t t_ispeedwat; /* t_ispeed override for watermarks. */
113 int t_ohiwat; /* High water mark for output. */
114 int t_olowat; /* Low water mark for output. */
115 speed_t t_ospeedwat; /* t_ospeed override for watermarks. */
116 int t_gen; /* Generation number. */
117 SLIST_ENTRY(tty) t_list; /* Global chain of ttys for pstat(8) */
118 };
119
120 #define t_cc t_termios.c_cc
121 #define t_cflag t_termios.c_cflag
122 #define t_dev ttyu.t_kdev
123 #define t_iflag t_termios.c_iflag
124 #define t_ispeed t_termios.c_ispeed
125 #define t_lflag t_termios.c_lflag
126 #define t_min t_termios.c_min
127 #define t_oflag t_termios.c_oflag
128 #define t_ospeed t_termios.c_ospeed
129 #define t_time t_termios.c_time
130
131 #define TTIPRI (PSOCK + 1) /* Sleep priority for tty reads. */
132 #define TTOPRI (PSOCK + 2) /* Sleep priority for tty writes. */
133
134 /*
135 * Userland version of struct tty, for sysctl.
136 */
137 struct xtty {
138 size_t xt_size; /* Structure size. */
139 long xt_rawcc; /* Raw input queue statistics. */
140 long xt_cancc; /* Canonical queue statistics. */
141 long xt_outcc; /* Output queue statistics. */
142 int xt_line; /* Interface to device drivers. */
143 udev_t xt_dev; /* Userland (sysctl) instance. */
144 int xt_state; /* Device and driver (TS*) state. */
145 int xt_flags; /* Tty flags. */
146 int xt_timeout; /* Timeout for ttywait(). */
147 pid_t xt_pgid; /* Process group ID. */
148 pid_t xt_sid; /* Session ID. */
149 struct termios xt_termios; /* Termios state. */
150 struct winsize xt_winsize; /* Window size. */
151 int xt_column; /* Tty output column. */
152 int xt_rocount, xt_rocol; /* Tty. */
153 int xt_ififosize; /* Total size of upstream fifos. */
154 int xt_ihiwat; /* High water mark for input. */
155 int xt_ilowat; /* Low water mark for input. */
156 speed_t xt_ispeedwat; /* t_ispeed override for watermarks. */
157 int xt_ohiwat; /* High water mark for output. */
158 int xt_olowat; /* Low water mark for output. */
159 speed_t xt_ospeedwat; /* t_ospeed override for watermarks. */
160 };
161
162 /*
163 * User data unfortunately has to be copied through buffers on the way to
164 * and from clists. The buffers are on the stack so their sizes must be
165 * fairly small.
166 */
167 #define IBUFSIZ 384 /* Should be >= max value of MIN. */
168 #define OBUFSIZ 100
169
170 #ifndef TTYHOG
171 #define TTYHOG 8192
172 #endif
173
174 #ifdef _KERNEL
175 #define TTMAXHIWAT roundup(2048, CBSIZE)
176 #define TTMINHIWAT roundup(100, CBSIZE)
177 #define TTMAXLOWAT 256
178 #define TTMINLOWAT 32
179 #endif
180
181 /* These flags are kept in t_state. */
182 #define TS_SO_OLOWAT 0x00001 /* Wake up when output <= low water. */
183 #define TS_ASYNC 0x00002 /* Tty in async I/O mode. */
184 #define TS_BUSY 0x00004 /* Draining output. */
185 #define TS_CARR_ON 0x00008 /* Carrier is present. */
186 #define TS_FLUSH 0x00010 /* Outq has been flushed during DMA. */
187 #define TS_ISOPEN 0x00020 /* Open has completed. */
188 #define TS_TBLOCK 0x00040 /* Further input blocked. */
189 #define TS_TIMEOUT 0x00080 /* Wait for output char processing. */
190 #define TS_TTSTOP 0x00100 /* Output paused. */
191 #ifdef notyet
192 #define TS_WOPEN 0x00200 /* Open in progress. */
193 #endif
194 #define TS_XCLUDE 0x00400 /* Tty requires exclusivity. */
195
196 /* State for intra-line fancy editing work. */
197 #define TS_BKSL 0x00800 /* State for lowercase \ work. */
198 #define TS_CNTTB 0x01000 /* Counting tab width, ignore FLUSHO. */
199 #define TS_ERASE 0x02000 /* Within a \.../ for PRTRUB. */
200 #define TS_LNCH 0x04000 /* Next character is literal. */
201 #define TS_TYPEN 0x08000 /* Retyping suspended input (PENDIN). */
202 #define TS_LOCAL (TS_BKSL | TS_CNTTB | TS_ERASE | TS_LNCH | TS_TYPEN)
203
204 /* Extras. */
205 #define TS_CAN_BYPASS_L_RINT 0x010000 /* Device in "raw" mode. */
206 #define TS_CONNECTED 0x020000 /* Connection open. */
207 #define TS_SNOOP 0x040000 /* Device is being snooped on. */
208 #define TS_SO_OCOMPLETE 0x080000 /* Wake up when output completes. */
209 #define TS_ZOMBIE 0x100000 /* Connection lost. */
210
211 /* Hardware flow-control-invoked bits. */
212 #define TS_CAR_OFLOW 0x200000 /* For MDMBUF (XXX handle in driver). */
213 #ifdef notyet
214 #define TS_CTS_OFLOW 0x400000 /* For CCTS_OFLOW. */
215 #define TS_DSR_OFLOW 0x800000 /* For CDSR_OFLOW. */
216 #endif
217
218 /* Character type information. */
219 #define ORDINARY 0
220 #define CONTROL 1
221 #define BACKSPACE 2
222 #define NEWLINE 3
223 #define TAB 4
224 #define VTAB 5
225 #define RETURN 6
226
227 struct speedtab {
228 int sp_speed; /* Speed. */
229 int sp_code; /* Code. */
230 };
231
232 /* Modem control commands (driver). */
233 #define DMSET 0
234 #define DMBIS 1
235 #define DMBIC 2
236 #define DMGET 3
237
238 /* Flags on a character passed to ttyinput. */
239 #define TTY_CHARMASK 0x000000ff /* Character mask */
240 #define TTY_QUOTE 0x00000100 /* Character quoted */
241 #define TTY_ERRORMASK 0xff000000 /* Error mask */
242 #define TTY_FE 0x01000000 /* Framing error */
243 #define TTY_PE 0x02000000 /* Parity error */
244 #define TTY_OE 0x04000000 /* Overrun error */
245 #define TTY_BI 0x08000000 /* Break condition */
246
247 /* Is tp controlling terminal for p? */
248 #define isctty(p, tp) \
249 ((p)->p_session == (tp)->t_session && (p)->p_flag & P_CONTROLT)
250
251 /* Is p in background of tp? */
252 #define isbackground(p, tp) \
253 (isctty((p), (tp)) && (p)->p_pgrp != (tp)->t_pgrp)
254
255 /* Unique sleep addresses. */
256 #define TSA_CARR_ON(tp) ((void *)&(tp)->t_rawq)
257 #define TSA_HUP_OR_INPUT(tp) ((void *)&(tp)->t_rawq.c_cf)
258 #define TSA_OCOMPLETE(tp) ((void *)&(tp)->t_outq.c_cl)
259 #define TSA_OLOWAT(tp) ((void *)&(tp)->t_outq)
260 #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
261 #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
262 #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
263
264 #ifdef _KERNEL
265 #ifdef MALLOC_DECLARE
266 MALLOC_DECLARE(M_TTYS);
267 #endif
268 extern struct msgbuf consmsgbuf; /* Message buffer for constty. */
269 extern struct tty *constty; /* Temporary virtual console. */
270 extern long tk_cancc;
271 extern long tk_nin;
272 extern long tk_nout;
273 extern long tk_rawcc;
274
275 int b_to_q(char *cp, int cc, struct clist *q);
276 void catq(struct clist *from, struct clist *to);
277 void clist_alloc_cblocks(struct clist *q, int ccmax, int ccres);
278 void clist_free_cblocks(struct clist *q);
279 void constty_set(struct tty *tp);
280 void constty_clear(void);
281 int getc(struct clist *q);
282 void ndflush(struct clist *q, int cc);
283 char *nextc(struct clist *q, char *cp, int *c);
284 void nottystop(struct tty *tp, int rw);
285 int putc(int c, struct clist *q);
286 int q_to_b(struct clist *q, char *cp, int cc);
287 void termioschars(struct termios *t);
288 int tputchar(int c, struct tty *tp);
289 int ttcompat(struct tty *tp, u_long com, caddr_t data, int flag);
290 int ttioctl(struct tty *tp, u_long com, void *data, int flag);
291 int ttread(struct tty *tp, struct uio *uio, int flag);
292 void ttrstrt(void *tp);
293 int ttsetcompat(struct tty *tp, u_long *com, caddr_t data,
294 struct termios *term);
295 void ttsetwater(struct tty *tp);
296 int ttspeedtab(int speed, struct speedtab *table);
297 int ttstart(struct tty *tp);
298 void ttwakeup(struct tty *tp);
299 int ttwrite(struct tty *tp, struct uio *uio, int flag);
300 void ttwwakeup(struct tty *tp);
301 void ttyblock(struct tty *tp);
302 void ttychars(struct tty *tp);
303 int ttycheckoutq(struct tty *tp, int wait);
304 int ttyclose(struct tty *tp);
305 void ttyflush(struct tty *tp, int rw);
306 void ttyfree(struct tty *tp);
307 void ttyinfo(struct tty *tp);
308 int ttyinput(int c, struct tty *tp);
309 int ttykqfilter(dev_t dev, struct knote *kn);
310 int ttylclose(struct tty *tp, int flag);
311 struct tty *ttymalloc(struct tty *tp);
312 int ttymodem(struct tty *tp, int flag);
313 int ttyopen(dev_t device, struct tty *tp);
314 int ttypoll(dev_t dev, int events, struct thread *td);
315 int ttyread(dev_t dev, struct uio *uio, int flag);
316 void ttyregister(struct tty *tp);
317 int ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo);
318 int ttywait(struct tty *tp);
319 int ttywrite(dev_t dev, struct uio *uio, int flag);
320 int unputc(struct clist *q);
321
322 #endif /* _KERNEL */
323
324 #endif /* !_SYS_TTY_H_ */
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