2 * Copyright (c) 1982, 1986, 1990, 1991, 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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
84 #include <sys/clist.h>
86 #include <sys/fcntl.h>
88 #include <sys/dkstat.h>
90 #include <sys/kernel.h>
91 #include <sys/vnode.h>
92 #include <sys/signalvar.h>
93 #include <sys/signal2.h>
94 #include <sys/resourcevar.h>
95 #include <sys/malloc.h>
96 #include <sys/filedesc.h>
97 #include <sys/sysctl.h>
98 #include <sys/thread2.h>
101 #include <sys/lock.h>
103 #include <vm/vm_map.h>
105 MALLOC_DEFINE(M_TTYS
, "ttys", "tty data structures");
107 static int proc_compare (struct proc
*p1
, struct proc
*p2
);
108 static int ttnread (struct tty
*tp
);
109 static void ttyecho (int c
, struct tty
*tp
);
110 static int ttyoutput (int c
, struct tty
*tp
);
111 static void ttypend (struct tty
*tp
);
112 static void ttyretype (struct tty
*tp
);
113 static void ttyrub (int c
, struct tty
*tp
);
114 static void ttyrubo (struct tty
*tp
, int cnt
);
115 static void ttyunblock (struct tty
*tp
);
116 static int ttywflush (struct tty
*tp
);
117 static int filt_ttyread (struct knote
*kn
, long hint
);
118 static void filt_ttyrdetach (struct knote
*kn
);
119 static int filt_ttywrite (struct knote
*kn
, long hint
);
120 static void filt_ttywdetach (struct knote
*kn
);
123 * Table with character classes and parity. The 8th bit indicates parity,
124 * the 7th bit indicates the character is an alphameric or underscore (for
125 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
126 * are 0 then the character needs no special processing on output; classes
127 * other than 0 might be translated or (not currently) require delays.
129 #define E 0x00 /* Even parity. */
130 #define O 0x80 /* Odd parity. */
131 #define PARITY(c) (char_type[c] & O)
133 #define ALPHA 0x40 /* Alpha or underscore. */
134 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
136 #define CCLASSMASK 0x3f
137 #define CCLASS(c) (char_type[c] & CCLASSMASK)
142 #define NA ORDINARY | ALPHA
148 static u_char
const char_type
[] = {
149 E
|CC
, O
|CC
, O
|CC
, E
|CC
, O
|CC
, E
|CC
, E
|CC
, O
|CC
, /* nul - bel */
150 O
|BS
, E
|TB
, E
|NL
, O
|CC
, E
|VT
, O
|CR
, O
|CC
, E
|CC
, /* bs - si */
151 O
|CC
, E
|CC
, E
|CC
, O
|CC
, E
|CC
, O
|CC
, O
|CC
, E
|CC
, /* dle - etb */
152 E
|CC
, O
|CC
, O
|CC
, E
|CC
, O
|CC
, E
|CC
, E
|CC
, O
|CC
, /* can - us */
153 O
|NO
, E
|NO
, E
|NO
, O
|NO
, E
|NO
, O
|NO
, O
|NO
, E
|NO
, /* sp - ' */
154 E
|NO
, O
|NO
, O
|NO
, E
|NO
, O
|NO
, E
|NO
, E
|NO
, O
|NO
, /* ( - / */
155 E
|NA
, O
|NA
, O
|NA
, E
|NA
, O
|NA
, E
|NA
, E
|NA
, O
|NA
, /* 0 - 7 */
156 O
|NA
, E
|NA
, E
|NO
, O
|NO
, E
|NO
, O
|NO
, O
|NO
, E
|NO
, /* 8 - ? */
157 O
|NO
, E
|NA
, E
|NA
, O
|NA
, E
|NA
, O
|NA
, O
|NA
, E
|NA
, /* @ - G */
158 E
|NA
, O
|NA
, O
|NA
, E
|NA
, O
|NA
, E
|NA
, E
|NA
, O
|NA
, /* H - O */
159 E
|NA
, O
|NA
, O
|NA
, E
|NA
, O
|NA
, E
|NA
, E
|NA
, O
|NA
, /* P - W */
160 O
|NA
, E
|NA
, E
|NA
, O
|NO
, E
|NO
, O
|NO
, O
|NO
, O
|NA
, /* X - _ */
161 E
|NO
, O
|NA
, O
|NA
, E
|NA
, O
|NA
, E
|NA
, E
|NA
, O
|NA
, /* ` - g */
162 O
|NA
, E
|NA
, E
|NA
, O
|NA
, E
|NA
, O
|NA
, O
|NA
, E
|NA
, /* h - o */
163 O
|NA
, E
|NA
, E
|NA
, O
|NA
, E
|NA
, O
|NA
, O
|NA
, E
|NA
, /* p - w */
164 E
|NA
, O
|NA
, O
|NA
, E
|NO
, O
|NO
, E
|NO
, E
|NO
, O
|CC
, /* x - del */
166 * Meta chars; should be settable per character set;
167 * for now, treat them all as normal characters.
169 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
170 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
171 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
172 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
173 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
174 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
175 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
176 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
177 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
178 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
179 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
180 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
181 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
182 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
183 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
184 NA
, NA
, NA
, NA
, NA
, NA
, NA
, NA
,
195 /* Macros to clear/set/test flags. */
196 #define SET(t, f) (t) |= (f)
197 #define CLR(t, f) (t) &= ~(f)
198 #define ISSET(t, f) ((t) & (f))
200 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
201 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
204 SYSCTL_OPAQUE(_kern
, OID_AUTO
, tk_nin
, CTLFLAG_RD
, &tk_nin
, sizeof(tk_nin
),
205 "LU", "TTY input statistic");
207 SYSCTL_OPAQUE(_kern
, OID_AUTO
, tk_nout
, CTLFLAG_RD
, &tk_nout
, sizeof(tk_nout
),
208 "LU", "TTY output statistic");
212 * list of struct tty where pstat(8) can pick it up with sysctl
214 static SLIST_HEAD(, tty
) tty_list
;
217 * Initial open of tty, or (re)entry to standard tty line discipline.
220 ttyopen(cdev_t device
, struct tty
*tp
)
224 if (!ISSET(tp
->t_state
, TS_ISOPEN
)) {
225 SET(tp
->t_state
, TS_ISOPEN
);
226 if (ISSET(tp
->t_cflag
, CLOCAL
))
227 SET(tp
->t_state
, TS_CONNECTED
);
228 bzero(&tp
->t_winsize
, sizeof(tp
->t_winsize
));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
245 ttyclose(struct tty
*tp
)
247 funsetown(tp
->t_sigio
);
252 ttyflush(tp
, FREAD
| FWRITE
);
253 clist_free_cblocks(&tp
->t_canq
);
254 clist_free_cblocks(&tp
->t_outq
);
255 clist_free_cblocks(&tp
->t_rawq
);
258 tp
->t_line
= TTYDISC
;
266 * Disassociate the tty from its session. Traditionally this has only been
267 * a half-close, meaning that the session was still allowed to point at the
268 * tty (resulting in the tty in the ps command showing something like 'p0-'),
269 * even though the tty is no longer pointing at the session.
271 * The half close seems to be useful only for 'ps' output but there is as
272 * yet no reason to remove the feature. The full-close code is currently
273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
276 ttyclearsession(struct tty
*tp
)
281 if ((sp
= tp
->t_session
) != NULL
) {
282 tp
->t_session
= NULL
;
283 #ifdef TTY_DO_FULL_CLOSE
284 /* FULL CLOSE (not yet) */
285 if (sp
->s_ttyp
== tp
) {
288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
289 "%p/%p\n", sp
->s_ttyp
, tp
);
296 * Release the tty vnode association for a session. This is the
297 * 'other half' of the close. Because multiple opens of /dev/tty
298 * only generate a single open to the actual tty, the file modes
299 * are locked to FREAD|FWRITE.
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
305 ttyclosesession(struct session
*sp
, int dorevoke
)
311 * There may not be a controlling terminal or it may have been closed
314 if ((vp
= sp
->s_ttyvp
) == NULL
)
318 * We need a lock if we have to close or revoke.
320 if ((vp
->v_flag
& VCTTYISOPEN
) || dorevoke
) {
322 if (vn_lock(vp
, LK_EXCLUSIVE
|LK_RETRY
)) {
328 * Retry if the vnode was ripped out from under us
330 if (vp
!= sp
->s_ttyvp
) {
337 * Close and revoke as needed
340 if (vp
->v_flag
& VCTTYISOPEN
) {
341 vclrflags(vp
, VCTTYISOPEN
);
342 VOP_CLOSE(vp
, FREAD
|FWRITE
);
345 VOP_REVOKE(vp
, REVOKEALL
);
354 #define FLUSHQ(q) { \
356 ndflush(q, (q)->c_cc); \
359 /* Is 'c' a line delimiter ("break" character)? */
360 #define TTBREAKC(c, lflag) \
361 ((c) == '\n' || (((c) == cc[VEOF] || \
362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
363 (c) != _POSIX_VDISABLE))
366 * Process input of a single character received on a tty.
369 ttyinput(int c
, struct tty
*tp
)
371 tcflag_t iflag
, lflag
;
376 * If input is pending take it first.
379 if (ISSET(lflag
, PENDIN
))
384 if (ISSET(lflag
, ICANON
))
391 * Block further input iff:
392 * current input > threshold AND input is available to user program
393 * AND input flow control is enabled and not yet invoked.
394 * The 3 is slop for PARMRK.
397 if (tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
> tp
->t_ihiwat
- 3 &&
398 (!ISSET(lflag
, ICANON
) || tp
->t_canq
.c_cc
!= 0) &&
399 (ISSET(tp
->t_cflag
, CRTS_IFLOW
) || ISSET(iflag
, IXOFF
)) &&
400 !ISSET(tp
->t_state
, TS_TBLOCK
))
403 /* Handle exceptional conditions (break, parity, framing). */
405 err
= (ISSET(c
, TTY_ERRORMASK
));
407 CLR(c
, TTY_ERRORMASK
);
408 if (ISSET(err
, TTY_BI
)) {
409 if (ISSET(iflag
, IGNBRK
))
411 if (ISSET(iflag
, BRKINT
)) {
412 ttyflush(tp
, FREAD
| FWRITE
);
413 pgsignal(tp
->t_pgrp
, SIGINT
, 1);
416 if (ISSET(iflag
, PARMRK
))
418 } else if ((ISSET(err
, TTY_PE
) && ISSET(iflag
, INPCK
))
419 || ISSET(err
, TTY_FE
)) {
420 if (ISSET(iflag
, IGNPAR
))
422 else if (ISSET(iflag
, PARMRK
)) {
424 if (tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
>
427 clist_putc(0377 | TTY_QUOTE
, &tp
->t_rawq
);
428 clist_putc(0 | TTY_QUOTE
, &tp
->t_rawq
);
429 clist_putc(c
| TTY_QUOTE
, &tp
->t_rawq
);
436 if (!ISSET(tp
->t_state
, TS_TYPEN
) && ISSET(iflag
, ISTRIP
))
438 if (!ISSET(lflag
, EXTPROC
)) {
440 * Check for literal nexting very first
442 if (ISSET(tp
->t_state
, TS_LNCH
)) {
444 CLR(tp
->t_state
, TS_LNCH
);
447 * Scan for special characters. This code
448 * is really just a big case statement with
449 * non-constant cases. The bottom of the
450 * case statement is labeled ``endcase'', so goto
451 * it after a case match, or similar.
455 * Control chars which aren't controlled
456 * by ICANON, ISIG, or IXON.
458 if (ISSET(lflag
, IEXTEN
)) {
459 if (CCEQ(cc
[VLNEXT
], c
)) {
460 if (ISSET(lflag
, ECHO
)) {
461 if (ISSET(lflag
, ECHOE
)) {
462 (void)ttyoutput('^', tp
);
463 (void)ttyoutput('\b', tp
);
467 SET(tp
->t_state
, TS_LNCH
);
470 if (CCEQ(cc
[VDISCARD
], c
)) {
471 if (ISSET(lflag
, FLUSHO
))
472 CLR(tp
->t_lflag
, FLUSHO
);
474 ttyflush(tp
, FWRITE
);
476 if (tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
)
478 SET(tp
->t_lflag
, FLUSHO
);
486 if (ISSET(lflag
, ISIG
)) {
487 if (CCEQ(cc
[VINTR
], c
) || CCEQ(cc
[VQUIT
], c
)) {
488 if (!ISSET(lflag
, NOFLSH
))
489 ttyflush(tp
, FREAD
| FWRITE
);
492 CCEQ(cc
[VINTR
], c
) ? SIGINT
: SIGQUIT
, 1);
495 if (CCEQ(cc
[VSUSP
], c
)) {
496 if (!ISSET(lflag
, NOFLSH
))
499 pgsignal(tp
->t_pgrp
, SIGTSTP
, 1);
504 * Handle start/stop characters.
506 if (ISSET(iflag
, IXON
)) {
507 if (CCEQ(cc
[VSTOP
], c
)) {
508 if (!ISSET(tp
->t_state
, TS_TTSTOP
)) {
509 SET(tp
->t_state
, TS_TTSTOP
);
510 (*tp
->t_stop
)(tp
, 0);
513 if (!CCEQ(cc
[VSTART
], c
))
516 * if VSTART == VSTOP then toggle
520 if (CCEQ(cc
[VSTART
], c
))
524 * IGNCR, ICRNL, & INLCR
527 if (ISSET(iflag
, IGNCR
))
529 else if (ISSET(iflag
, ICRNL
))
531 } else if (c
== '\n' && ISSET(iflag
, INLCR
))
534 if (!ISSET(tp
->t_lflag
, EXTPROC
) && ISSET(lflag
, ICANON
)) {
536 * From here on down canonical mode character
537 * processing takes place.
540 * erase or erase2 (^H / ^?)
542 if (CCEQ(cc
[VERASE
], c
) || CCEQ(cc
[VERASE2
], c
) ) {
544 ttyrub(clist_unputc(&tp
->t_rawq
), tp
);
550 if (CCEQ(cc
[VKILL
], c
)) {
551 if (ISSET(lflag
, ECHOKE
) &&
552 tp
->t_rawq
.c_cc
== tp
->t_rocount
&&
553 !ISSET(lflag
, ECHOPRT
))
554 while (tp
->t_rawq
.c_cc
)
555 ttyrub(clist_unputc(&tp
->t_rawq
), tp
);
558 if (ISSET(lflag
, ECHOK
) ||
559 ISSET(lflag
, ECHOKE
))
564 CLR(tp
->t_state
, TS_LOCAL
);
570 if (CCEQ(cc
[VWERASE
], c
) && ISSET(lflag
, IEXTEN
)) {
576 while ((c
= clist_unputc(&tp
->t_rawq
)) == ' ' || c
== '\t')
581 * erase last char of word and remember the
582 * next chars type (for ALTWERASE)
585 c
= clist_unputc(&tp
->t_rawq
);
588 if (c
== ' ' || c
== '\t') {
589 clist_putc(c
, &tp
->t_rawq
);
598 c
= clist_unputc(&tp
->t_rawq
);
601 } while (c
!= ' ' && c
!= '\t' &&
602 (!ISSET(lflag
, ALTWERASE
) || ISALPHA(c
) == ctype
));
603 clist_putc(c
, &tp
->t_rawq
);
609 if (CCEQ(cc
[VREPRINT
], c
) && ISSET(lflag
, IEXTEN
)) {
614 * ^T - kernel info and generate SIGINFO
616 if (CCEQ(cc
[VSTATUS
], c
) && ISSET(lflag
, IEXTEN
)) {
617 if (ISSET(lflag
, ISIG
))
618 pgsignal(tp
->t_pgrp
, SIGINFO
, 1);
619 if (!ISSET(lflag
, NOKERNINFO
))
623 if (CCEQ(cc
[VCHECKPT
], c
) && ISSET(lflag
, IEXTEN
)) {
624 if (ISSET(lflag
, ISIG
))
625 pgsignal(tp
->t_pgrp
, SIGCKPT
, 1);
630 * Check for input buffer overflow
632 if (tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
>= MAX_INPUT
) {
634 if (ISSET(iflag
, IMAXBEL
)) {
635 if (tp
->t_outq
.c_cc
< tp
->t_ohiwat
)
636 (void)ttyoutput(CTRL('g'), tp
);
641 if ( c
== 0377 && ISSET(iflag
, PARMRK
) && !ISSET(iflag
, ISTRIP
)
642 && ISSET(iflag
, IGNBRK
|IGNPAR
) != (IGNBRK
|IGNPAR
))
643 clist_putc(0377 | TTY_QUOTE
, &tp
->t_rawq
);
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
649 if (clist_putc(c
, &tp
->t_rawq
) >= 0) {
650 if (!ISSET(lflag
, ICANON
)) {
655 if (TTBREAKC(c
, lflag
)) {
657 catq(&tp
->t_rawq
, &tp
->t_canq
);
659 } else if (tp
->t_rocount
++ == 0)
660 tp
->t_rocol
= tp
->t_column
;
661 if (ISSET(tp
->t_state
, TS_ERASE
)) {
663 * end of prterase \.../
665 CLR(tp
->t_state
, TS_ERASE
);
666 (void)ttyoutput('/', tp
);
670 if (CCEQ(cc
[VEOF
], c
) && ISSET(lflag
, ECHO
)) {
672 * Place the cursor over the '^' of the ^D.
674 i
= imin(2, tp
->t_column
- i
);
676 (void)ttyoutput('\b', tp
);
683 * IXANY means allow any character to restart output.
685 if (ISSET(tp
->t_state
, TS_TTSTOP
) &&
686 !ISSET(iflag
, IXANY
) && cc
[VSTART
] != cc
[VSTOP
])
689 CLR(tp
->t_lflag
, FLUSHO
);
690 CLR(tp
->t_state
, TS_TTSTOP
);
692 return (ttstart(tp
));
696 * Output a single character on a tty, doing output processing
697 * as needed (expanding tabs, newline processing, etc.).
698 * Returns < 0 if succeeds, otherwise returns char to resend.
702 ttyoutput(int c
, struct tty
*tp
)
708 if (!ISSET(oflag
, OPOST
)) {
709 if (ISSET(tp
->t_lflag
, FLUSHO
))
711 if (clist_putc(c
, &tp
->t_outq
))
718 * Do tab expansion if OXTABS is set. Special case if we external
719 * processing, we don't do the tab expansion because we'll probably
720 * get it wrong. If tab expansion needs to be done, let it happen
723 CLR(c
, ~TTY_CHARMASK
);
725 ISSET(oflag
, OXTABS
) && !ISSET(tp
->t_lflag
, EXTPROC
)) {
726 c
= 8 - (tp
->t_column
& 7);
727 if (!ISSET(tp
->t_lflag
, FLUSHO
)) {
728 crit_enter(); /* Don't interrupt tabs. */
729 c
-= b_to_q(" ", c
, &tp
->t_outq
);
735 return (c
? -1 : '\t');
737 if (c
== CEOT
&& ISSET(oflag
, ONOEOT
))
741 * Newline translation: if ONLCR is set,
742 * translate newline into "\r\n".
744 if (c
== '\n' && ISSET(tp
->t_oflag
, ONLCR
)) {
747 if (!ISSET(tp
->t_lflag
, FLUSHO
) && clist_putc('\r', &tp
->t_outq
))
750 /* If OCRNL is set, translate "\r" into "\n". */
751 else if (c
== '\r' && ISSET(tp
->t_oflag
, OCRNL
))
753 /* If ONOCR is set, don't transmit CRs when on column 0. */
754 else if (c
== '\r' && ISSET(tp
->t_oflag
, ONOCR
) && tp
->t_column
== 0)
759 if (!ISSET(tp
->t_lflag
, FLUSHO
) && clist_putc(c
, &tp
->t_outq
))
771 if (ISSET(tp
->t_oflag
, ONLCR
| ONLRET
))
781 col
= (col
+ 8) & ~7;
789 * Ioctls for all tty devices. Called after line-discipline specific ioctl
790 * has been called to do discipline-specific functions and/or reject any
791 * of these ioctl commands.
795 ttioctl(struct tty
*tp
, u_long cmd
, void *data
, int flag
)
797 struct thread
*td
= curthread
;
798 struct lwp
*lp
= td
->td_lwp
;
799 struct proc
*p
= td
->td_proc
;
804 /* If the ioctl involves modification, hang if in the background. */
828 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
838 while (isbackground(p
, tp
) && !(p
->p_flag
& P_PPWAIT
) &&
839 !SIGISMEMBER(p
->p_sigignore
, SIGTTOU
) &&
840 !SIGISMEMBER(lp
->lwp_sigmask
, SIGTTOU
)) {
841 if (p
->p_pgrp
->pg_jobc
== 0)
843 pgsignal(p
->p_pgrp
, SIGTTOU
, 1);
844 error
= ttysleep(tp
, &lbolt
, PCATCH
, "ttybg1",
852 switch (cmd
) { /* Process the ioctl. */
853 case FIOASYNC
: /* set/clear async i/o */
856 SET(tp
->t_state
, TS_ASYNC
);
858 CLR(tp
->t_state
, TS_ASYNC
);
861 case FIONREAD
: /* get # bytes to read */
863 *(int *)data
= ttnread(tp
);
869 * Policy -- Don't allow FIOSETOWN on someone else's
872 if (tp
->t_session
!= NULL
&& !isctty(p
, tp
))
875 error
= fsetown(*(int *)data
, &tp
->t_sigio
);
880 if (tp
->t_session
!= NULL
&& !isctty(p
, tp
))
882 *(int *)data
= fgetown(tp
->t_sigio
);
885 case TIOCEXCL
: /* set exclusive use of tty */
887 SET(tp
->t_state
, TS_XCLUDE
);
890 case TIOCFLUSH
: { /* flush buffers */
891 int flags
= *(int *)data
;
894 flags
= FREAD
| FWRITE
;
896 flags
&= FREAD
| FWRITE
;
900 case TIOCCONS
: /* become virtual console */
902 if (constty
&& constty
!= tp
&&
903 ISSET(constty
->t_state
, TS_CONNECTED
))
906 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0)
910 } else if (tp
== constty
)
913 case TIOCDRAIN
: /* wait till output drained */
918 case TIOCGETA
: { /* get termios struct */
919 struct termios
*t
= (struct termios
*)data
;
921 bcopy(&tp
->t_termios
, t
, sizeof(struct termios
));
924 case TIOCGETD
: /* get line discipline */
925 *(int *)data
= tp
->t_line
;
927 case TIOCGWINSZ
: /* get window size */
928 *(struct winsize
*)data
= tp
->t_winsize
;
930 case TIOCGPGRP
: /* get pgrp of tty */
933 *(int *)data
= tp
->t_pgrp
? tp
->t_pgrp
->pg_id
: NO_PID
;
936 case TIOCHPCL
: /* hang up on last close */
938 SET(tp
->t_cflag
, HUPCL
);
942 case TIOCNXCL
: /* reset exclusive use of tty */
944 CLR(tp
->t_state
, TS_XCLUDE
);
947 case TIOCOUTQ
: /* output queue size */
948 *(int *)data
= tp
->t_outq
.c_cc
;
950 case TIOCSETA
: /* set termios struct */
951 case TIOCSETAW
: /* drain output, set */
952 case TIOCSETAF
: { /* drn out, fls in, set */
953 struct termios
*t
= (struct termios
*)data
;
955 if (t
->c_ispeed
== 0)
956 t
->c_ispeed
= t
->c_ospeed
;
957 if (t
->c_ispeed
== 0)
958 t
->c_ispeed
= tp
->t_ospeed
;
959 if (t
->c_ispeed
== 0)
962 if (cmd
== TIOCSETAW
|| cmd
== TIOCSETAF
) {
968 if (cmd
== TIOCSETAF
)
971 if (!ISSET(t
->c_cflag
, CIGNORE
)) {
973 * Set device hardware.
975 if (tp
->t_param
&& (error
= (*tp
->t_param
)(tp
, t
))) {
979 if (ISSET(t
->c_cflag
, CLOCAL
) &&
980 !ISSET(tp
->t_cflag
, CLOCAL
)) {
982 * XXX disconnections would be too hard to
983 * get rid of without this kludge. The only
984 * way to get rid of controlling terminals
985 * is to exit from the session leader.
987 CLR(tp
->t_state
, TS_ZOMBIE
);
989 wakeup(TSA_CARR_ON(tp
));
993 if ((ISSET(tp
->t_state
, TS_CARR_ON
) ||
994 ISSET(t
->c_cflag
, CLOCAL
)) &&
995 !ISSET(tp
->t_state
, TS_ZOMBIE
))
996 SET(tp
->t_state
, TS_CONNECTED
);
998 CLR(tp
->t_state
, TS_CONNECTED
);
999 tp
->t_cflag
= t
->c_cflag
;
1000 tp
->t_ispeed
= t
->c_ispeed
;
1001 if (t
->c_ospeed
!= 0)
1002 tp
->t_ospeed
= t
->c_ospeed
;
1005 if (ISSET(t
->c_lflag
, ICANON
) != ISSET(tp
->t_lflag
, ICANON
) &&
1007 if (ISSET(t
->c_lflag
, ICANON
))
1008 SET(tp
->t_lflag
, PENDIN
);
1011 * XXX we really shouldn't allow toggling
1012 * ICANON while we're in a non-termios line
1013 * discipline. Now we have to worry about
1014 * panicing for a null queue.
1016 if (tp
->t_canq
.c_cbreserved
> 0 &&
1017 tp
->t_rawq
.c_cbreserved
> 0) {
1018 catq(&tp
->t_rawq
, &tp
->t_canq
);
1020 * XXX the queue limits may be
1021 * different, so the old queue
1022 * swapping method no longer works.
1024 catq(&tp
->t_canq
, &tp
->t_rawq
);
1026 CLR(tp
->t_lflag
, PENDIN
);
1030 tp
->t_iflag
= t
->c_iflag
;
1031 tp
->t_oflag
= t
->c_oflag
;
1033 * Make the EXTPROC bit read only.
1035 if (ISSET(tp
->t_lflag
, EXTPROC
))
1036 SET(t
->c_lflag
, EXTPROC
);
1038 CLR(t
->c_lflag
, EXTPROC
);
1039 tp
->t_lflag
= t
->c_lflag
| ISSET(tp
->t_lflag
, PENDIN
);
1040 if (t
->c_cc
[VMIN
] != tp
->t_cc
[VMIN
] ||
1041 t
->c_cc
[VTIME
] != tp
->t_cc
[VTIME
])
1043 bcopy(t
->c_cc
, tp
->t_cc
, sizeof(t
->c_cc
));
1047 case TIOCSETD
: { /* set line discipline */
1048 int t
= *(int *)data
;
1049 cdev_t device
= tp
->t_dev
;
1051 if ((u_int
)t
>= nlinesw
)
1053 if (t
!= tp
->t_line
) {
1055 (*linesw
[tp
->t_line
].l_close
)(tp
, flag
);
1056 error
= (*linesw
[t
].l_open
)(device
, tp
);
1058 (void)(*linesw
[tp
->t_line
].l_open
)(device
, tp
);
1067 case TIOCSTART
: /* start output, like ^Q */
1069 if (ISSET(tp
->t_state
, TS_TTSTOP
) ||
1070 ISSET(tp
->t_lflag
, FLUSHO
)) {
1071 CLR(tp
->t_lflag
, FLUSHO
);
1072 CLR(tp
->t_state
, TS_TTSTOP
);
1077 case TIOCSTI
: /* simulate terminal input */
1078 if ((flag
& FREAD
) == 0 && priv_check(td
, PRIV_ROOT
))
1080 if (!isctty(p
, tp
) && priv_check(td
, PRIV_ROOT
))
1083 (*linesw
[tp
->t_line
].l_rint
)(*(u_char
*)data
, tp
);
1086 case TIOCSTOP
: /* stop output, like ^S */
1088 if (!ISSET(tp
->t_state
, TS_TTSTOP
)) {
1089 SET(tp
->t_state
, TS_TTSTOP
);
1090 (*tp
->t_stop
)(tp
, 0);
1094 case TIOCSCTTY
: /* become controlling tty */
1095 /* Session ctty vnode pointer set in vnode layer. */
1096 if (!SESS_LEADER(p
) ||
1097 ((p
->p_session
->s_ttyvp
|| tp
->t_session
) &&
1098 (tp
->t_session
!= p
->p_session
)))
1100 tp
->t_session
= p
->p_session
;
1101 tp
->t_pgrp
= p
->p_pgrp
;
1102 p
->p_session
->s_ttyp
= tp
;
1103 p
->p_flag
|= P_CONTROLT
;
1105 case TIOCSPGRP
: { /* set pgrp of tty */
1106 struct pgrp
*pgrp
= pgfind(*(int *)data
);
1110 else if (pgrp
== NULL
|| pgrp
->pg_session
!= p
->p_session
)
1115 case TIOCSTAT
: /* simulate control-T */
1120 case TIOCSWINSZ
: /* set window size */
1121 if (bcmp((caddr_t
)&tp
->t_winsize
, data
,
1122 sizeof (struct winsize
))) {
1123 tp
->t_winsize
= *(struct winsize
*)data
;
1124 pgsignal(tp
->t_pgrp
, SIGWINCH
, 1);
1127 case TIOCSDRAINWAIT
:
1128 error
= priv_check(td
, PRIV_ROOT
);
1131 tp
->t_timeout
= *(int *)data
* hz
;
1132 wakeup(TSA_OCOMPLETE(tp
));
1133 wakeup(TSA_OLOWAT(tp
));
1135 case TIOCGDRAINWAIT
:
1136 *(int *)data
= tp
->t_timeout
/ hz
;
1139 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1140 return (ttcompat(tp
, cmd
, data
, flag
));
1149 ttypoll(struct dev_poll_args
*ap
)
1151 cdev_t dev
= ap
->a_head
.a_dev
;
1152 int events
= ap
->a_events
;
1157 /* XXX used to return ENXIO, but that means true! */
1159 ap
->a_events
= (events
& (POLLIN
| POLLOUT
| POLLRDNORM
|
1160 POLLWRNORM
)) | POLLHUP
;
1165 if (events
& (POLLIN
| POLLRDNORM
)) {
1166 if (ttnread(tp
) > 0 || ISSET(tp
->t_state
, TS_ZOMBIE
))
1167 revents
|= events
& (POLLIN
| POLLRDNORM
);
1169 selrecord(curthread
, &tp
->t_rsel
);
1171 if (events
& (POLLOUT
| POLLWRNORM
)) {
1172 if ((tp
->t_outq
.c_cc
<= tp
->t_olowat
&&
1173 ISSET(tp
->t_state
, TS_CONNECTED
))
1174 || ISSET(tp
->t_state
, TS_ZOMBIE
))
1175 revents
|= events
& (POLLOUT
| POLLWRNORM
);
1177 selrecord(curthread
, &tp
->t_wsel
);
1180 ap
->a_events
= revents
;
1184 static struct filterops ttyread_filtops
=
1185 { 1, NULL
, filt_ttyrdetach
, filt_ttyread
};
1186 static struct filterops ttywrite_filtops
=
1187 { 1, NULL
, filt_ttywdetach
, filt_ttywrite
};
1190 ttykqfilter(struct dev_kqfilter_args
*ap
)
1192 cdev_t dev
= ap
->a_head
.a_dev
;
1193 struct knote
*kn
= ap
->a_kn
;
1194 struct tty
*tp
= dev
->si_tty
;
1195 struct klist
*klist
;
1198 switch (kn
->kn_filter
) {
1200 klist
= &tp
->t_rsel
.si_note
;
1201 kn
->kn_fop
= &ttyread_filtops
;
1204 klist
= &tp
->t_wsel
.si_note
;
1205 kn
->kn_fop
= &ttywrite_filtops
;
1212 kn
->kn_hook
= (caddr_t
)dev
;
1215 SLIST_INSERT_HEAD(klist
, kn
, kn_selnext
);
1222 filt_ttyrdetach(struct knote
*kn
)
1224 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1227 SLIST_REMOVE(&tp
->t_rsel
.si_note
, kn
, knote
, kn_selnext
);
1232 filt_ttyread(struct knote
*kn
, long hint
)
1234 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1236 kn
->kn_data
= ttnread(tp
);
1237 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1238 kn
->kn_flags
|= EV_EOF
;
1241 return (kn
->kn_data
> 0);
1245 filt_ttywdetach(struct knote
*kn
)
1247 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1250 SLIST_REMOVE(&tp
->t_wsel
.si_note
, kn
, knote
, kn_selnext
);
1255 filt_ttywrite(struct knote
*kn
, long hint
)
1257 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1259 kn
->kn_data
= tp
->t_outq
.c_cc
;
1260 if (ISSET(tp
->t_state
, TS_ZOMBIE
))
1262 return (kn
->kn_data
<= tp
->t_olowat
&&
1263 ISSET(tp
->t_state
, TS_CONNECTED
));
1267 * Must be called while in a critical section.
1270 ttnread(struct tty
*tp
)
1274 if (ISSET(tp
->t_lflag
, PENDIN
))
1276 nread
= tp
->t_canq
.c_cc
;
1277 if (!ISSET(tp
->t_lflag
, ICANON
)) {
1278 nread
+= tp
->t_rawq
.c_cc
;
1279 if (nread
< tp
->t_cc
[VMIN
] && tp
->t_cc
[VTIME
] == 0)
1286 * Wait for output to drain.
1289 ttywait(struct tty
*tp
)
1295 while ((tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)) &&
1296 ISSET(tp
->t_state
, TS_CONNECTED
) && tp
->t_oproc
) {
1298 if ((tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)) &&
1299 ISSET(tp
->t_state
, TS_CONNECTED
)) {
1300 SET(tp
->t_state
, TS_SO_OCOMPLETE
);
1301 error
= ttysleep(tp
, TSA_OCOMPLETE(tp
),
1305 if (error
== EWOULDBLOCK
)
1312 if (!error
&& (tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)))
1319 * Flush if successfully wait.
1322 ttywflush(struct tty
*tp
)
1326 if ((error
= ttywait(tp
)) == 0)
1327 ttyflush(tp
, FREAD
);
1332 * Flush tty read and/or write queues, notifying anyone waiting.
1335 ttyflush(struct tty
*tp
, int rw
)
1342 FLUSHQ(&tp
->t_outq
);
1343 CLR(tp
->t_state
, TS_TTSTOP
);
1345 (*tp
->t_stop
)(tp
, rw
);
1347 FLUSHQ(&tp
->t_canq
);
1348 FLUSHQ(&tp
->t_rawq
);
1349 CLR(tp
->t_lflag
, PENDIN
);
1352 CLR(tp
->t_state
, TS_LOCAL
);
1354 if (ISSET(tp
->t_state
, TS_TBLOCK
)) {
1356 FLUSHQ(&tp
->t_outq
);
1360 * Don't let leave any state that might clobber the
1361 * next line discipline (although we should do more
1362 * to send the START char). Not clearing the state
1363 * may have caused the "putc to a clist with no
1364 * reserved cblocks" panic/kprintf.
1366 CLR(tp
->t_state
, TS_TBLOCK
);
1368 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1369 if (ISSET(tp
->t_iflag
, IXOFF
)) {
1371 * XXX wait a bit in the hope that the stop
1372 * character (if any) will go out. Waiting
1373 * isn't good since it allows races. This
1374 * will be fixed when the stop character is
1375 * put in a special queue. Don't bother with
1376 * the checks in ttywait() since the timeout
1379 SET(tp
->t_state
, TS_SO_OCOMPLETE
);
1380 ttysleep(tp
, TSA_OCOMPLETE(tp
), 0,
1383 * Don't try sending the stop character again.
1385 CLR(tp
->t_state
, TS_TBLOCK
);
1392 FLUSHQ(&tp
->t_outq
);
1399 * Copy in the default termios characters.
1402 termioschars(struct termios
*t
)
1405 bcopy(ttydefchars
, t
->c_cc
, sizeof t
->c_cc
);
1412 ttychars(struct tty
*tp
)
1415 termioschars(&tp
->t_termios
);
1419 * Handle input high water. Send stop character for the IXOFF case. Turn
1420 * on our input flow control bit and propagate the changes to the driver.
1421 * XXX the stop character should be put in a special high priority queue.
1424 ttyblock(struct tty
*tp
)
1427 SET(tp
->t_state
, TS_TBLOCK
);
1428 if (ISSET(tp
->t_iflag
, IXOFF
) && tp
->t_cc
[VSTOP
] != _POSIX_VDISABLE
&&
1429 clist_putc(tp
->t_cc
[VSTOP
], &tp
->t_outq
) != 0)
1430 CLR(tp
->t_state
, TS_TBLOCK
); /* try again later */
1435 * Handle input low water. Send start character for the IXOFF case. Turn
1436 * off our input flow control bit and propagate the changes to the driver.
1437 * XXX the start character should be put in a special high priority queue.
1440 ttyunblock(struct tty
*tp
)
1443 CLR(tp
->t_state
, TS_TBLOCK
);
1444 if (ISSET(tp
->t_iflag
, IXOFF
) && tp
->t_cc
[VSTART
] != _POSIX_VDISABLE
&&
1445 clist_putc(tp
->t_cc
[VSTART
], &tp
->t_outq
) != 0)
1446 SET(tp
->t_state
, TS_TBLOCK
); /* try again later */
1451 /* Not used by any current (i386) drivers. */
1453 * Restart after an inter-char delay.
1456 ttrstrt(void *tp_arg
)
1460 KASSERT(tp_arg
!= NULL
, ("ttrstrt"));
1464 CLR(tp
->t_state
, TS_TIMEOUT
);
1471 ttstart(struct tty
*tp
)
1474 if (tp
->t_oproc
!= NULL
) /* XXX: Kludge for pty. */
1480 * "close" a line discipline
1483 ttylclose(struct tty
*tp
, int flag
)
1486 if (flag
& FNONBLOCK
|| ttywflush(tp
))
1487 ttyflush(tp
, FREAD
| FWRITE
);
1492 * Handle modem control transition on a tty.
1493 * Flag indicates new state of carrier.
1494 * Returns 0 if the line should be turned off, otherwise 1.
1497 ttymodem(struct tty
*tp
, int flag
)
1500 if (ISSET(tp
->t_state
, TS_CARR_ON
) && ISSET(tp
->t_cflag
, MDMBUF
)) {
1502 * MDMBUF: do flow control according to carrier flag
1503 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1504 * works if IXON and IXANY are clear.
1507 CLR(tp
->t_state
, TS_CAR_OFLOW
);
1508 CLR(tp
->t_state
, TS_TTSTOP
);
1510 } else if (!ISSET(tp
->t_state
, TS_CAR_OFLOW
)) {
1511 SET(tp
->t_state
, TS_CAR_OFLOW
);
1512 SET(tp
->t_state
, TS_TTSTOP
);
1513 (*tp
->t_stop
)(tp
, 0);
1515 } else if (flag
== 0) {
1519 CLR(tp
->t_state
, TS_CARR_ON
);
1520 if (ISSET(tp
->t_state
, TS_ISOPEN
) &&
1521 !ISSET(tp
->t_cflag
, CLOCAL
)) {
1522 SET(tp
->t_state
, TS_ZOMBIE
);
1523 CLR(tp
->t_state
, TS_CONNECTED
);
1524 if (tp
->t_session
&& tp
->t_session
->s_leader
)
1525 ksignal(tp
->t_session
->s_leader
, SIGHUP
);
1526 ttyflush(tp
, FREAD
| FWRITE
);
1533 SET(tp
->t_state
, TS_CARR_ON
);
1534 if (!ISSET(tp
->t_state
, TS_ZOMBIE
))
1535 SET(tp
->t_state
, TS_CONNECTED
);
1536 wakeup(TSA_CARR_ON(tp
));
1544 * Reinput pending characters after state switch
1545 * call from a critical section.
1548 ttypend(struct tty
*tp
)
1553 CLR(tp
->t_lflag
, PENDIN
);
1554 SET(tp
->t_state
, TS_TYPEN
);
1556 * XXX this assumes too much about clist internals. It may even
1557 * fail if the cblock slush pool is empty. We can't allocate more
1558 * cblocks here because we are called from an interrupt handler
1559 * and clist_alloc_cblocks() can wait.
1562 bzero(&tp
->t_rawq
, sizeof tp
->t_rawq
);
1563 tp
->t_rawq
.c_cbmax
= tq
.c_cbmax
;
1564 tp
->t_rawq
.c_cbreserved
= tq
.c_cbreserved
;
1565 while ((c
= clist_getc(&tq
)) >= 0)
1567 CLR(tp
->t_state
, TS_TYPEN
);
1571 * Process a read call on a tty device.
1574 ttread(struct tty
*tp
, struct uio
*uio
, int flag
)
1579 cc_t
*cc
= tp
->t_cc
;
1582 int first
, error
= 0;
1583 int has_stime
= 0, last_cc
= 0;
1584 long slp
= 0; /* XXX this should be renamed `timo'. */
1585 struct timeval stime
;
1587 lp
= curthread
->td_lwp
;
1591 lflag
= tp
->t_lflag
;
1593 * take pending input first
1595 if (ISSET(lflag
, PENDIN
)) {
1597 splz(); /* reduce latency */
1598 lflag
= tp
->t_lflag
; /* XXX ttypend() clobbers it */
1602 * Hang process if it's in the background.
1604 if ((pp
= curproc
) && isbackground(pp
, tp
)) {
1606 if (SIGISMEMBER(pp
->p_sigignore
, SIGTTIN
) ||
1607 SIGISMEMBER(lp
->lwp_sigmask
, SIGTTIN
) ||
1608 (pp
->p_flag
& P_PPWAIT
) || pp
->p_pgrp
->pg_jobc
== 0)
1610 pgsignal(pp
->p_pgrp
, SIGTTIN
, 1);
1611 error
= ttysleep(tp
, &lbolt
, PCATCH
, "ttybg2", 0);
1617 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1619 return (0); /* EOF */
1623 * If canonical, use the canonical queue,
1624 * else use the raw queue.
1626 * (should get rid of clists...)
1628 qp
= ISSET(lflag
, ICANON
) ? &tp
->t_canq
: &tp
->t_rawq
;
1630 if (flag
& IO_NDELAY
) {
1633 if (!ISSET(lflag
, ICANON
) && cc
[VMIN
] == 0) {
1638 return (EWOULDBLOCK
);
1640 if (!ISSET(lflag
, ICANON
)) {
1643 struct timeval timecopy
;
1646 * Check each of the four combinations.
1647 * (m > 0 && t == 0) is the normal read case.
1648 * It should be fairly efficient, so we check that and its
1649 * companion case (m == 0 && t == 0) first.
1650 * For the other two cases, we compute the target sleep time
1659 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1663 t
*= 100000; /* time in us */
1664 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1665 ((t1).tv_usec - (t2).tv_usec))
1671 getmicrotime(&timecopy
);
1673 /* first character, start timer */
1677 } else if (qp
->c_cc
> last_cc
) {
1678 /* got a character, restart timer */
1682 /* nothing, check expiration */
1683 slp
= t
- diff(timecopy
, stime
);
1688 } else { /* m == 0 */
1691 getmicrotime(&timecopy
);
1697 slp
= t
- diff(timecopy
, stime
);
1699 /* Timed out, but 0 is enough input. */
1707 * Rounding down may make us wake up just short
1708 * of the target, so we round up.
1709 * The formula is ceiling(slp * hz/1000000).
1710 * 32-bit arithmetic is enough for hz < 169.
1711 * XXX see tvtohz() for how to avoid overflow if hz
1712 * is large (divide by `tick' and/or arrange to
1713 * use tvtohz() if hz is large).
1715 slp
= (long) (((u_long
)slp
* hz
) + 999999) / 1000000;
1718 if (qp
->c_cc
<= 0) {
1721 * There is no input, or not enough input and we can block.
1723 error
= ttysleep(tp
, TSA_HUP_OR_INPUT(tp
), PCATCH
,
1724 ISSET(tp
->t_state
, TS_CONNECTED
) ?
1725 "ttyin" : "ttyhup", (int)slp
);
1727 if (error
== EWOULDBLOCK
)
1732 * XXX what happens if another process eats some input
1733 * while we are asleep (not just here)? It would be
1734 * safest to detect changes and reset our state variables
1735 * (has_stime and last_cc).
1743 * Input present, check for input mapping and processing.
1746 if (ISSET(lflag
, ICANON
| ISIG
))
1752 icc
= imin(uio
->uio_resid
, IBUFSIZ
);
1753 icc
= q_to_b(qp
, ibuf
, icc
);
1759 error
= uiomove(ibuf
, icc
, uio
);
1761 * XXX if there was an error then we should ungetc() the
1762 * unmoved chars and reduce icc here.
1766 if (uio
->uio_resid
== 0)
1780 * delayed suspend (^Y)
1782 if (CCEQ(cc
[VDSUSP
], c
) &&
1783 ISSET(lflag
, IEXTEN
| ISIG
) == (IEXTEN
| ISIG
)) {
1784 pgsignal(tp
->t_pgrp
, SIGTSTP
, 1);
1786 error
= ttysleep(tp
, &lbolt
, PCATCH
,
1795 * Interpret EOF only in canonical mode.
1797 if (CCEQ(cc
[VEOF
], c
) && ISSET(lflag
, ICANON
))
1800 * Give user character.
1802 error
= ureadc(c
, uio
);
1804 /* XXX should ungetc(c, qp). */
1806 if (uio
->uio_resid
== 0)
1809 * In canonical mode check for a "break character"
1810 * marking the end of a "line of input".
1812 if (ISSET(lflag
, ICANON
) && TTBREAKC(c
, lflag
))
1819 * Look to unblock input now that (presumably)
1820 * the input queue has gone down.
1823 if (ISSET(tp
->t_state
, TS_TBLOCK
) &&
1824 tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
<= tp
->t_ilowat
)
1832 * Check the output queue on tp for space for a kernel message (from uprintf
1833 * or tprintf). Allow some space over the normal hiwater mark so we don't
1834 * lose messages due to normal flow control, but don't let the tty run amok.
1835 * Sleeps here are not interruptible, but we return prematurely if new signals
1839 ttycheckoutq(struct tty
*tp
, int wait
)
1841 struct lwp
*lp
= curthread
->td_lwp
;
1843 sigset_t oldset
, newset
;
1845 hiwat
= tp
->t_ohiwat
;
1846 SIGEMPTYSET(oldset
);
1847 SIGEMPTYSET(newset
);
1850 oldset
= lwp_sigpend(lp
);
1851 if (tp
->t_outq
.c_cc
> hiwat
+ OBUFSIZ
+ 100) {
1852 while (tp
->t_outq
.c_cc
> hiwat
) {
1854 if (tp
->t_outq
.c_cc
<= hiwat
)
1857 newset
= lwp_sigpend(lp
);
1858 if (!wait
|| SIGSETNEQ(oldset
, newset
)) {
1862 SET(tp
->t_state
, TS_SO_OLOWAT
);
1863 tsleep(TSA_OLOWAT(tp
), 0, "ttoutq", hz
);
1871 * Process a write call on a tty device.
1874 ttwrite(struct tty
*tp
, struct uio
*uio
, int flag
)
1880 int i
, hiwat
, cnt
, error
;
1883 lp
= curthread
->td_lwp
;
1884 hiwat
= tp
->t_ohiwat
;
1885 cnt
= uio
->uio_resid
;
1890 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1892 if (uio
->uio_resid
== cnt
)
1896 if (!ISSET(tp
->t_state
, TS_CONNECTED
)) {
1897 if (flag
& IO_NDELAY
) {
1899 error
= EWOULDBLOCK
;
1902 error
= ttysleep(tp
, TSA_CARR_ON(tp
), PCATCH
, "ttydcd", 0);
1911 * Hang the process if it's in the background.
1913 if ((pp
= curproc
) && isbackground(pp
, tp
) &&
1914 ISSET(tp
->t_lflag
, TOSTOP
) && !(pp
->p_flag
& P_PPWAIT
) &&
1915 !SIGISMEMBER(pp
->p_sigignore
, SIGTTOU
) &&
1916 !SIGISMEMBER(lp
->lwp_sigmask
, SIGTTOU
)) {
1917 if (pp
->p_pgrp
->pg_jobc
== 0) {
1921 pgsignal(pp
->p_pgrp
, SIGTTOU
, 1);
1922 error
= ttysleep(tp
, &lbolt
, PCATCH
, "ttybg4", 0);
1928 * Process the user's data in at most OBUFSIZ chunks. Perform any
1929 * output translation. Keep track of high water mark, sleep on
1930 * overflow awaiting device aid in acquiring new space.
1932 while (uio
->uio_resid
> 0 || cc
> 0) {
1933 if (ISSET(tp
->t_lflag
, FLUSHO
)) {
1937 if (tp
->t_outq
.c_cc
> hiwat
)
1940 * Grab a hunk of data from the user, unless we have some
1941 * leftover from last time.
1944 cc
= imin(uio
->uio_resid
, OBUFSIZ
);
1946 error
= uiomove(cp
, cc
, uio
);
1953 * If nothing fancy need be done, grab those characters we
1954 * can handle without any of ttyoutput's processing and
1955 * just transfer them to the output q. For those chars
1956 * which require special processing (as indicated by the
1957 * bits in char_type), call ttyoutput. After processing
1958 * a hunk of data, look for FLUSHO so ^O's will take effect
1962 if (!ISSET(tp
->t_oflag
, OPOST
))
1965 ce
= cc
- scanc((u_int
)cc
, (u_char
*)cp
,
1966 char_type
, CCLASSMASK
);
1968 * If ce is zero, then we're processing
1969 * a special character through ttyoutput.
1973 if (ttyoutput(*cp
, tp
) >= 0) {
1974 /* No Clists, wait a bit. */
1976 if (flag
& IO_NDELAY
) {
1977 error
= EWOULDBLOCK
;
1980 error
= ttysleep(tp
, &lbolt
,
1989 if (ISSET(tp
->t_lflag
, FLUSHO
) ||
1990 tp
->t_outq
.c_cc
> hiwat
)
1996 * A bunch of normal characters have been found.
1997 * Transfer them en masse to the output queue and
1998 * continue processing at the top of the loop.
1999 * If there are any further characters in this
2000 * <= OBUFSIZ chunk, the first should be a character
2001 * requiring special handling by ttyoutput.
2004 i
= b_to_q(cp
, ce
, &tp
->t_outq
);
2007 cp
+= ce
, cc
-= ce
, tk_nout
+= ce
;
2010 /* No Clists, wait a bit. */
2012 if (flag
& IO_NDELAY
) {
2013 error
= EWOULDBLOCK
;
2016 error
= ttysleep(tp
, &lbolt
, PCATCH
,
2022 if (ISSET(tp
->t_lflag
, FLUSHO
) ||
2023 tp
->t_outq
.c_cc
> hiwat
)
2030 * If cc is nonzero, we leave the uio structure inconsistent, as the
2031 * offset and iov pointers have moved forward, but it doesn't matter
2032 * (the call will either return short or restart with a new uio).
2034 uio
->uio_resid
+= cc
;
2041 * This can only occur if FLUSHO is set in t_lflag,
2042 * or if ttstart/oproc is synchronous (or very fast).
2044 if (tp
->t_outq
.c_cc
<= hiwat
) {
2048 if (flag
& IO_NDELAY
) {
2050 uio
->uio_resid
+= cc
;
2051 return (uio
->uio_resid
== cnt
? EWOULDBLOCK
: 0);
2053 SET(tp
->t_state
, TS_SO_OLOWAT
);
2054 error
= ttysleep(tp
, TSA_OLOWAT(tp
), PCATCH
, "ttywri", tp
->t_timeout
);
2056 if (error
== EWOULDBLOCK
)
2064 * Rubout one character from the rawq of tp
2065 * as cleanly as possible.
2068 ttyrub(int c
, struct tty
*tp
)
2074 if (!ISSET(tp
->t_lflag
, ECHO
) || ISSET(tp
->t_lflag
, EXTPROC
))
2076 CLR(tp
->t_lflag
, FLUSHO
);
2077 if (ISSET(tp
->t_lflag
, ECHOE
)) {
2078 if (tp
->t_rocount
== 0) {
2080 * Screwed by ttwrite; retype
2085 if (c
== ('\t' | TTY_QUOTE
) || c
== ('\n' | TTY_QUOTE
))
2088 CLR(c
, ~TTY_CHARMASK
);
2089 switch (CCLASS(c
)) {
2098 if (ISSET(tp
->t_lflag
, ECHOCTL
))
2102 if (tp
->t_rocount
< tp
->t_rawq
.c_cc
) {
2107 savecol
= tp
->t_column
;
2108 SET(tp
->t_state
, TS_CNTTB
);
2109 SET(tp
->t_lflag
, FLUSHO
);
2110 tp
->t_column
= tp
->t_rocol
;
2111 cp
= tp
->t_rawq
.c_cf
;
2113 tabc
= *cp
; /* XXX FIX NEXTC */
2114 for (; cp
; cp
= nextc(&tp
->t_rawq
, cp
, &tabc
))
2116 CLR(tp
->t_lflag
, FLUSHO
);
2117 CLR(tp
->t_state
, TS_CNTTB
);
2120 /* savecol will now be length of the tab. */
2121 savecol
-= tp
->t_column
;
2122 tp
->t_column
+= savecol
;
2124 savecol
= 8; /* overflow screw */
2125 while (--savecol
>= 0)
2126 (void)ttyoutput('\b', tp
);
2129 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2130 (void)kprintf(PANICSTR
, c
, CCLASS(c
));
2132 panic(PANICSTR
, c
, CCLASS(c
));
2136 } else if (ISSET(tp
->t_lflag
, ECHOPRT
)) {
2137 if (!ISSET(tp
->t_state
, TS_ERASE
)) {
2138 SET(tp
->t_state
, TS_ERASE
);
2139 (void)ttyoutput('\\', tp
);
2143 ttyecho(tp
->t_cc
[VERASE
], tp
);
2145 * This code may be executed not only when an ERASE key
2146 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2147 * So, I didn't think it was worthwhile to pass the extra
2148 * information (which would need an extra parameter,
2149 * changing every call) needed to distinguish the ERASE2
2150 * case from the ERASE.
2157 * Back over cnt characters, erasing them.
2160 ttyrubo(struct tty
*tp
, int cnt
)
2164 (void)ttyoutput('\b', tp
);
2165 (void)ttyoutput(' ', tp
);
2166 (void)ttyoutput('\b', tp
);
2172 * Reprint the rawq line. Note, it is assumed that c_cc has already
2176 ttyretype(struct tty
*tp
)
2181 /* Echo the reprint character. */
2182 if (tp
->t_cc
[VREPRINT
] != _POSIX_VDISABLE
)
2183 ttyecho(tp
->t_cc
[VREPRINT
], tp
);
2185 (void)ttyoutput('\n', tp
);
2189 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2190 * BIT OF FIRST CHAR.
2193 for (cp
= tp
->t_canq
.c_cf
, c
= (cp
!= NULL
? *cp
: 0);
2194 cp
!= NULL
; cp
= nextc(&tp
->t_canq
, cp
, &c
))
2196 for (cp
= tp
->t_rawq
.c_cf
, c
= (cp
!= NULL
? *cp
: 0);
2197 cp
!= NULL
; cp
= nextc(&tp
->t_rawq
, cp
, &c
))
2199 CLR(tp
->t_state
, TS_ERASE
);
2202 tp
->t_rocount
= tp
->t_rawq
.c_cc
;
2207 * Echo a typed character to the terminal.
2210 ttyecho(int c
, struct tty
*tp
)
2213 if (!ISSET(tp
->t_state
, TS_CNTTB
))
2214 CLR(tp
->t_lflag
, FLUSHO
);
2215 if ((!ISSET(tp
->t_lflag
, ECHO
) &&
2216 (c
!= '\n' || !ISSET(tp
->t_lflag
, ECHONL
))) ||
2217 ISSET(tp
->t_lflag
, EXTPROC
))
2219 if (ISSET(tp
->t_lflag
, ECHOCTL
) &&
2220 ((ISSET(c
, TTY_CHARMASK
) <= 037 && c
!= '\t' && c
!= '\n') ||
2221 ISSET(c
, TTY_CHARMASK
) == 0177)) {
2222 (void)ttyoutput('^', tp
);
2223 CLR(c
, ~TTY_CHARMASK
);
2229 (void)ttyoutput(c
, tp
);
2233 * Wake up any readers on a tty.
2236 ttwakeup(struct tty
*tp
)
2239 if (tp
->t_rsel
.si_pid
!= 0)
2240 selwakeup(&tp
->t_rsel
);
2241 if (ISSET(tp
->t_state
, TS_ASYNC
) && tp
->t_sigio
!= NULL
)
2242 pgsigio(tp
->t_sigio
, SIGIO
, (tp
->t_session
!= NULL
));
2243 wakeup(TSA_HUP_OR_INPUT(tp
));
2244 KNOTE(&tp
->t_rsel
.si_note
, 0);
2248 * Wake up any writers on a tty.
2251 ttwwakeup(struct tty
*tp
)
2254 if (tp
->t_wsel
.si_pid
!= 0 && tp
->t_outq
.c_cc
<= tp
->t_olowat
)
2255 selwakeup(&tp
->t_wsel
);
2256 if (ISSET(tp
->t_state
, TS_ASYNC
) && tp
->t_sigio
!= NULL
)
2257 pgsigio(tp
->t_sigio
, SIGIO
, (tp
->t_session
!= NULL
));
2258 if (ISSET(tp
->t_state
, TS_BUSY
| TS_SO_OCOMPLETE
) ==
2259 TS_SO_OCOMPLETE
&& tp
->t_outq
.c_cc
== 0) {
2260 CLR(tp
->t_state
, TS_SO_OCOMPLETE
);
2261 wakeup(TSA_OCOMPLETE(tp
));
2263 if (ISSET(tp
->t_state
, TS_SO_OLOWAT
) &&
2264 tp
->t_outq
.c_cc
<= tp
->t_olowat
) {
2265 CLR(tp
->t_state
, TS_SO_OLOWAT
);
2266 wakeup(TSA_OLOWAT(tp
));
2268 KNOTE(&tp
->t_wsel
.si_note
, 0);
2272 * Look up a code for a specified speed in a conversion table;
2273 * used by drivers to map software speed values to hardware parameters.
2276 ttspeedtab(int speed
, struct speedtab
*table
)
2279 for ( ; table
->sp_speed
!= -1; table
++)
2280 if (table
->sp_speed
== speed
)
2281 return (table
->sp_code
);
2286 * Set input and output watermarks and buffer sizes. For input, the
2287 * high watermark is about one second's worth of input above empty, the
2288 * low watermark is slightly below high water, and the buffer size is a
2289 * driver-dependent amount above high water. For output, the watermarks
2290 * are near the ends of the buffer, with about 1 second's worth of input
2291 * between them. All this only applies to the standard line discipline.
2294 ttsetwater(struct tty
*tp
)
2296 int cps
, ttmaxhiwat
, x
;
2299 clist_alloc_cblocks(&tp
->t_canq
, TTYHOG
, 512);
2300 switch (tp
->t_ispeedwat
) {
2302 cps
= tp
->t_ispeed
/ 10;
2306 * This case is for old drivers that don't know about
2307 * t_ispeedwat. Arrange for them to get the old buffer
2308 * sizes and watermarks.
2310 cps
= TTYHOG
- 2 * 256;
2311 tp
->t_ififosize
= 2 * 2048;
2314 cps
= tp
->t_ispeedwat
/ 10;
2318 tp
->t_ilowat
= 7 * cps
/ 8;
2319 x
= cps
+ tp
->t_ififosize
;
2320 clist_alloc_cblocks(&tp
->t_rawq
, x
, x
);
2323 switch (tp
->t_ospeedwat
) {
2325 cps
= tp
->t_ospeed
/ 10;
2326 ttmaxhiwat
= 2 * TTMAXHIWAT
;
2329 cps
= tp
->t_ospeed
/ 10;
2330 ttmaxhiwat
= TTMAXHIWAT
;
2333 cps
= tp
->t_ospeedwat
/ 10;
2334 ttmaxhiwat
= 8 * TTMAXHIWAT
;
2337 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2338 tp
->t_olowat
= x
= CLAMP(cps
/ 2, TTMAXLOWAT
, TTMINLOWAT
);
2340 x
= CLAMP(x
, ttmaxhiwat
, TTMINHIWAT
); /* XXX clamps are too magic */
2341 tp
->t_ohiwat
= roundup(x
, CBSIZE
); /* XXX for compat */
2342 x
= imax(tp
->t_ohiwat
, TTMAXHIWAT
); /* XXX for compat/safety */
2344 clist_alloc_cblocks(&tp
->t_outq
, x
, x
);
2349 * Report on state of foreground process group.
2352 ttyinfo(struct tty
*tp
)
2354 struct proc
*p
, *pick
;
2359 if (ttycheckoutq(tp
,0) == 0)
2363 * We always print the load average, then figure out what else to
2364 * print based on the state of the current process group.
2366 tmp
= (averunnable
.ldavg
[0] * 100 + FSCALE
/ 2) >> FSHIFT
;
2367 ttyprintf(tp
, "load: %d.%02d ", tmp
/ 100, tmp
% 100);
2369 if (tp
->t_session
== NULL
) {
2370 ttyprintf(tp
, "not a controlling terminal\n");
2371 } else if (tp
->t_pgrp
== NULL
) {
2372 ttyprintf(tp
, "no foreground process group\n");
2373 } else if ((p
= LIST_FIRST(&tp
->t_pgrp
->pg_members
)) == 0) {
2374 ttyprintf(tp
, "empty foreground process group\n");
2377 * Pick an interesting process. Note that certain elements,
2378 * in particular the wmesg, require a critical section for
2379 * safe access (YYY and we are still not MP safe).
2381 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2390 /* XXX lwp should compare lwps */
2392 for (pick
= NULL
; p
!= 0; p
= LIST_NEXT(p
, p_pglist
)) {
2393 if (proc_compare(pick
, p
))
2398 lp
= FIRST_LWP_IN_PROC(pick
);
2400 ttyprintf(tp
, "foreground process without lwp\n");
2407 * Figure out what wait/process-state message, and command
2411 * XXX lwp This is a horrible mixture. We need to rework this
2412 * as soon as lwps have their own runnable status.
2414 if (pick
->p_flag
& P_WEXIT
)
2416 else if (lp
->lwp_stat
== LSRUN
)
2418 else if (pick
->p_stat
== SIDL
)
2420 else if (lp
->lwp_wmesg
) /* lwp_thread must not be NULL */
2421 str
= lp
->lwp_wmesg
;
2425 ksnprintf(buf
, sizeof(buf
), "cmd: %s %d [%s]",
2426 pick
->p_comm
, pick
->p_pid
, str
);
2429 * Calculate cpu usage, percent cpu, and cmsz. Note that
2430 * 'pick' becomes invalid the moment we exit the critical
2433 if (lp
->lwp_thread
&& (pick
->p_flag
& P_SWAPPEDOUT
) == 0)
2434 calcru_proc(pick
, &ru
);
2436 pctcpu
= (lp
->lwp_pctcpu
* 10000 + FSCALE
/ 2) >> FSHIFT
;
2438 if (pick
->p_stat
== SIDL
|| pick
->p_stat
== SZOMB
)
2441 vmsz
= pgtok(vmspace_resident_count(pick
->p_vmspace
));
2448 ttyprintf(tp
, " %s ", buf
);
2449 ttyprintf(tp
, "%ld.%02ldu ",
2450 ru
.ru_utime
.tv_sec
, ru
.ru_utime
.tv_usec
/ 10000);
2451 ttyprintf(tp
, "%ld.%02lds ",
2452 ru
.ru_stime
.tv_sec
, ru
.ru_stime
.tv_usec
/ 10000);
2453 ttyprintf(tp
, "%d%% %ldk\n", pctcpu
/ 100, vmsz
);
2455 tp
->t_rocount
= 0; /* so pending input will be retyped if BS */
2459 * Returns 1 if p2 is "better" than p1
2461 * The algorithm for picking the "interesting" process is thus:
2463 * 1) Only foreground processes are eligible - implied.
2464 * 2) Runnable processes are favored over anything else. The runner
2465 * with the highest cpu utilization is picked (p_cpticks). Ties are
2466 * broken by picking the highest pid.
2467 * 3) The sleeper with the shortest sleep time is next. With ties,
2468 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2469 * 4) Further ties are broken by picking the highest pid.
2471 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2472 #define TESTAB(a, b) ((a)<<1 | (b))
2478 proc_compare(struct proc
*p1
, struct proc
*p2
)
2480 struct lwp
*lp1
, *lp2
;
2487 switch (TESTAB(p1
->p_stat
== SZOMB
, p2
->p_stat
== SZOMB
)) {
2493 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2497 lp1
= FIRST_LWP_IN_PROC(p1
);
2498 lp2
= FIRST_LWP_IN_PROC(p2
);
2501 * see if at least one of them is runnable
2503 switch (TESTAB(ISRUN(lp1
), ISRUN(lp2
))) {
2510 * tie - favor one with highest recent cpu utilization
2512 if (lp2
->lwp_cpticks
> lp1
->lwp_cpticks
)
2514 if (lp1
->lwp_cpticks
> lp2
->lwp_cpticks
)
2516 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2519 * pick the one with the smallest sleep time
2521 if (lp2
->lwp_slptime
> lp1
->lwp_slptime
)
2523 if (lp1
->lwp_slptime
> lp2
->lwp_slptime
)
2526 * favor one sleeping in a non-interruptible sleep
2528 if (lp1
->lwp_flag
& LWP_SINTR
&& (lp2
->lwp_flag
& LWP_SINTR
) == 0)
2530 if (lp2
->lwp_flag
& LWP_SINTR
&& (lp1
->lwp_flag
& LWP_SINTR
) == 0)
2532 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2536 * Output char to tty; console putchar style.
2539 tputchar(int c
, struct tty
*tp
)
2542 if (!ISSET(tp
->t_state
, TS_CONNECTED
)) {
2547 (void)ttyoutput('\r', tp
);
2548 (void)ttyoutput(c
, tp
);
2555 * Sleep on chan, returning ERESTART if tty changed while we napped and
2556 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2557 * the tty is revoked, restarting a pending call will redo validation done
2558 * at the start of the call.
2561 ttysleep(struct tty
*tp
, void *chan
, int slpflags
, char *wmesg
, int timo
)
2567 error
= tsleep(chan
, slpflags
, wmesg
, timo
);
2570 return (tp
->t_gen
== gen
? 0 : ERESTART
);
2574 * Allocate a tty struct. Clists in the struct will be allocated by
2578 ttymalloc(struct tty
*tp
)
2583 tp
= kmalloc(sizeof *tp
, M_TTYS
, M_WAITOK
|M_ZERO
);
2590 * Free a tty struct. Clists in the struct should have been freed by
2593 * XXX not yet usable: since we support a half-closed state and do not
2594 * ref count the tty reference from the session, it is possible for a
2595 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2598 ttyfree(struct tty
*tp
)
2605 ttyregister(struct tty
*tp
)
2607 SLIST_INSERT_HEAD(&tty_list
, tp
, t_list
);
2611 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS
)
2615 SLIST_FOREACH(tp
, &tty_list
, t_list
) {
2618 t
.t_dev
= (cdev_t
)dev2udev(t
.t_dev
);
2619 error
= SYSCTL_OUT(req
, (caddr_t
)&t
, sizeof(t
));
2626 SYSCTL_PROC(_kern
, OID_AUTO
, ttys
, CTLTYPE_OPAQUE
|CTLFLAG_RD
,
2627 0, 0, sysctl_kern_ttys
, "S,tty", "All struct ttys");
2630 nottystop(struct tty
*tp
, int rw
)
2637 ttyread(struct dev_read_args
*ap
)
2641 tp
= ap
->a_head
.a_dev
->si_tty
;
2644 return ((*linesw
[tp
->t_line
].l_read
)(tp
, ap
->a_uio
, ap
->a_ioflag
));
2648 ttywrite(struct dev_write_args
*ap
)
2652 tp
= ap
->a_head
.a_dev
->si_tty
;
2655 return ((*linesw
[tp
->t_line
].l_write
)(tp
, ap
->a_uio
, ap
->a_ioflag
));