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
);
346 vrevoke(vp
, proc0
.p_ucred
);
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
;
935 case TIOCGSID
: /* get sid of tty */
938 *(int *)data
= tp
->t_session
->s_sid
;
941 case TIOCHPCL
: /* hang up on last close */
943 SET(tp
->t_cflag
, HUPCL
);
947 case TIOCNXCL
: /* reset exclusive use of tty */
949 CLR(tp
->t_state
, TS_XCLUDE
);
952 case TIOCOUTQ
: /* output queue size */
953 *(int *)data
= tp
->t_outq
.c_cc
;
955 case TIOCSETA
: /* set termios struct */
956 case TIOCSETAW
: /* drain output, set */
957 case TIOCSETAF
: { /* drn out, fls in, set */
958 struct termios
*t
= (struct termios
*)data
;
960 if (t
->c_ispeed
== 0)
961 t
->c_ispeed
= t
->c_ospeed
;
962 if (t
->c_ispeed
== 0)
963 t
->c_ispeed
= tp
->t_ospeed
;
964 if (t
->c_ispeed
== 0)
967 if (cmd
== TIOCSETAW
|| cmd
== TIOCSETAF
) {
973 if (cmd
== TIOCSETAF
)
976 if (!ISSET(t
->c_cflag
, CIGNORE
)) {
978 * Set device hardware.
980 if (tp
->t_param
&& (error
= (*tp
->t_param
)(tp
, t
))) {
984 if (ISSET(t
->c_cflag
, CLOCAL
) &&
985 !ISSET(tp
->t_cflag
, CLOCAL
)) {
987 * XXX disconnections would be too hard to
988 * get rid of without this kludge. The only
989 * way to get rid of controlling terminals
990 * is to exit from the session leader.
992 CLR(tp
->t_state
, TS_ZOMBIE
);
994 wakeup(TSA_CARR_ON(tp
));
998 if ((ISSET(tp
->t_state
, TS_CARR_ON
) ||
999 ISSET(t
->c_cflag
, CLOCAL
)) &&
1000 !ISSET(tp
->t_state
, TS_ZOMBIE
))
1001 SET(tp
->t_state
, TS_CONNECTED
);
1003 CLR(tp
->t_state
, TS_CONNECTED
);
1004 tp
->t_cflag
= t
->c_cflag
;
1005 tp
->t_ispeed
= t
->c_ispeed
;
1006 if (t
->c_ospeed
!= 0)
1007 tp
->t_ospeed
= t
->c_ospeed
;
1010 if (ISSET(t
->c_lflag
, ICANON
) != ISSET(tp
->t_lflag
, ICANON
) &&
1012 if (ISSET(t
->c_lflag
, ICANON
))
1013 SET(tp
->t_lflag
, PENDIN
);
1016 * XXX we really shouldn't allow toggling
1017 * ICANON while we're in a non-termios line
1018 * discipline. Now we have to worry about
1019 * panicing for a null queue.
1021 if (tp
->t_canq
.c_cbreserved
> 0 &&
1022 tp
->t_rawq
.c_cbreserved
> 0) {
1023 catq(&tp
->t_rawq
, &tp
->t_canq
);
1025 * XXX the queue limits may be
1026 * different, so the old queue
1027 * swapping method no longer works.
1029 catq(&tp
->t_canq
, &tp
->t_rawq
);
1031 CLR(tp
->t_lflag
, PENDIN
);
1035 tp
->t_iflag
= t
->c_iflag
;
1036 tp
->t_oflag
= t
->c_oflag
;
1038 * Make the EXTPROC bit read only.
1040 if (ISSET(tp
->t_lflag
, EXTPROC
))
1041 SET(t
->c_lflag
, EXTPROC
);
1043 CLR(t
->c_lflag
, EXTPROC
);
1044 tp
->t_lflag
= t
->c_lflag
| ISSET(tp
->t_lflag
, PENDIN
);
1045 if (t
->c_cc
[VMIN
] != tp
->t_cc
[VMIN
] ||
1046 t
->c_cc
[VTIME
] != tp
->t_cc
[VTIME
])
1048 bcopy(t
->c_cc
, tp
->t_cc
, sizeof(t
->c_cc
));
1052 case TIOCSETD
: { /* set line discipline */
1053 int t
= *(int *)data
;
1054 cdev_t device
= tp
->t_dev
;
1056 if ((u_int
)t
>= nlinesw
)
1058 if (t
!= tp
->t_line
) {
1060 (*linesw
[tp
->t_line
].l_close
)(tp
, flag
);
1061 error
= (*linesw
[t
].l_open
)(device
, tp
);
1063 (void)(*linesw
[tp
->t_line
].l_open
)(device
, tp
);
1072 case TIOCSTART
: /* start output, like ^Q */
1074 if (ISSET(tp
->t_state
, TS_TTSTOP
) ||
1075 ISSET(tp
->t_lflag
, FLUSHO
)) {
1076 CLR(tp
->t_lflag
, FLUSHO
);
1077 CLR(tp
->t_state
, TS_TTSTOP
);
1082 case TIOCSTI
: /* simulate terminal input */
1083 if ((flag
& FREAD
) == 0 && priv_check(td
, PRIV_ROOT
))
1085 if (!isctty(p
, tp
) && priv_check(td
, PRIV_ROOT
))
1088 (*linesw
[tp
->t_line
].l_rint
)(*(u_char
*)data
, tp
);
1091 case TIOCSTOP
: /* stop output, like ^S */
1093 if (!ISSET(tp
->t_state
, TS_TTSTOP
)) {
1094 SET(tp
->t_state
, TS_TTSTOP
);
1095 (*tp
->t_stop
)(tp
, 0);
1099 case TIOCSCTTY
: /* become controlling tty */
1100 /* Session ctty vnode pointer set in vnode layer. */
1101 if (!SESS_LEADER(p
) ||
1102 ((p
->p_session
->s_ttyvp
|| tp
->t_session
) &&
1103 (tp
->t_session
!= p
->p_session
)))
1105 tp
->t_session
= p
->p_session
;
1106 tp
->t_pgrp
= p
->p_pgrp
;
1107 p
->p_session
->s_ttyp
= tp
;
1108 p
->p_flag
|= P_CONTROLT
;
1110 case TIOCSPGRP
: { /* set pgrp of tty */
1111 struct pgrp
*pgrp
= pgfind(*(int *)data
);
1115 else if (pgrp
== NULL
|| pgrp
->pg_session
!= p
->p_session
)
1120 case TIOCSTAT
: /* simulate control-T */
1125 case TIOCSWINSZ
: /* set window size */
1126 if (bcmp((caddr_t
)&tp
->t_winsize
, data
,
1127 sizeof (struct winsize
))) {
1128 tp
->t_winsize
= *(struct winsize
*)data
;
1129 pgsignal(tp
->t_pgrp
, SIGWINCH
, 1);
1132 case TIOCSDRAINWAIT
:
1133 error
= priv_check(td
, PRIV_ROOT
);
1136 tp
->t_timeout
= *(int *)data
* hz
;
1137 wakeup(TSA_OCOMPLETE(tp
));
1138 wakeup(TSA_OLOWAT(tp
));
1140 case TIOCGDRAINWAIT
:
1141 *(int *)data
= tp
->t_timeout
/ hz
;
1144 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1145 return (ttcompat(tp
, cmd
, data
, flag
));
1154 ttypoll(struct dev_poll_args
*ap
)
1156 cdev_t dev
= ap
->a_head
.a_dev
;
1157 int events
= ap
->a_events
;
1162 /* XXX used to return ENXIO, but that means true! */
1164 ap
->a_events
= (events
& (POLLIN
| POLLOUT
| POLLRDNORM
|
1165 POLLWRNORM
)) | POLLHUP
;
1170 if (events
& (POLLIN
| POLLRDNORM
)) {
1171 if (ttnread(tp
) > 0 || ISSET(tp
->t_state
, TS_ZOMBIE
))
1172 revents
|= events
& (POLLIN
| POLLRDNORM
);
1174 selrecord(curthread
, &tp
->t_rsel
);
1176 if (events
& (POLLOUT
| POLLWRNORM
)) {
1177 if ((tp
->t_outq
.c_cc
<= tp
->t_olowat
&&
1178 ISSET(tp
->t_state
, TS_CONNECTED
))
1179 || ISSET(tp
->t_state
, TS_ZOMBIE
))
1180 revents
|= events
& (POLLOUT
| POLLWRNORM
);
1182 selrecord(curthread
, &tp
->t_wsel
);
1185 ap
->a_events
= revents
;
1189 static struct filterops ttyread_filtops
=
1190 { 1, NULL
, filt_ttyrdetach
, filt_ttyread
};
1191 static struct filterops ttywrite_filtops
=
1192 { 1, NULL
, filt_ttywdetach
, filt_ttywrite
};
1195 ttykqfilter(struct dev_kqfilter_args
*ap
)
1197 cdev_t dev
= ap
->a_head
.a_dev
;
1198 struct knote
*kn
= ap
->a_kn
;
1199 struct tty
*tp
= dev
->si_tty
;
1200 struct klist
*klist
;
1203 switch (kn
->kn_filter
) {
1205 klist
= &tp
->t_rsel
.si_note
;
1206 kn
->kn_fop
= &ttyread_filtops
;
1209 klist
= &tp
->t_wsel
.si_note
;
1210 kn
->kn_fop
= &ttywrite_filtops
;
1217 kn
->kn_hook
= (caddr_t
)dev
;
1220 SLIST_INSERT_HEAD(klist
, kn
, kn_selnext
);
1227 filt_ttyrdetach(struct knote
*kn
)
1229 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1232 SLIST_REMOVE(&tp
->t_rsel
.si_note
, kn
, knote
, kn_selnext
);
1237 filt_ttyread(struct knote
*kn
, long hint
)
1239 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1241 kn
->kn_data
= ttnread(tp
);
1242 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1243 kn
->kn_flags
|= EV_EOF
;
1246 return (kn
->kn_data
> 0);
1250 filt_ttywdetach(struct knote
*kn
)
1252 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1255 SLIST_REMOVE(&tp
->t_wsel
.si_note
, kn
, knote
, kn_selnext
);
1260 filt_ttywrite(struct knote
*kn
, long hint
)
1262 struct tty
*tp
= ((cdev_t
)kn
->kn_hook
)->si_tty
;
1264 kn
->kn_data
= tp
->t_outq
.c_cc
;
1265 if (ISSET(tp
->t_state
, TS_ZOMBIE
))
1267 return (kn
->kn_data
<= tp
->t_olowat
&&
1268 ISSET(tp
->t_state
, TS_CONNECTED
));
1272 * Must be called while in a critical section.
1275 ttnread(struct tty
*tp
)
1279 if (ISSET(tp
->t_lflag
, PENDIN
))
1281 nread
= tp
->t_canq
.c_cc
;
1282 if (!ISSET(tp
->t_lflag
, ICANON
)) {
1283 nread
+= tp
->t_rawq
.c_cc
;
1284 if (nread
< tp
->t_cc
[VMIN
] && tp
->t_cc
[VTIME
] == 0)
1291 * Wait for output to drain.
1294 ttywait(struct tty
*tp
)
1300 while ((tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)) &&
1301 ISSET(tp
->t_state
, TS_CONNECTED
) && tp
->t_oproc
) {
1303 if ((tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)) &&
1304 ISSET(tp
->t_state
, TS_CONNECTED
)) {
1305 SET(tp
->t_state
, TS_SO_OCOMPLETE
);
1306 error
= ttysleep(tp
, TSA_OCOMPLETE(tp
),
1310 if (error
== EWOULDBLOCK
)
1317 if (!error
&& (tp
->t_outq
.c_cc
|| ISSET(tp
->t_state
, TS_BUSY
)))
1324 * Flush if successfully wait.
1327 ttywflush(struct tty
*tp
)
1331 if ((error
= ttywait(tp
)) == 0)
1332 ttyflush(tp
, FREAD
);
1337 * Flush tty read and/or write queues, notifying anyone waiting.
1340 ttyflush(struct tty
*tp
, int rw
)
1347 FLUSHQ(&tp
->t_outq
);
1348 CLR(tp
->t_state
, TS_TTSTOP
);
1350 (*tp
->t_stop
)(tp
, rw
);
1352 FLUSHQ(&tp
->t_canq
);
1353 FLUSHQ(&tp
->t_rawq
);
1354 CLR(tp
->t_lflag
, PENDIN
);
1357 CLR(tp
->t_state
, TS_LOCAL
);
1359 if (ISSET(tp
->t_state
, TS_TBLOCK
)) {
1361 FLUSHQ(&tp
->t_outq
);
1365 * Don't let leave any state that might clobber the
1366 * next line discipline (although we should do more
1367 * to send the START char). Not clearing the state
1368 * may have caused the "putc to a clist with no
1369 * reserved cblocks" panic/kprintf.
1371 CLR(tp
->t_state
, TS_TBLOCK
);
1373 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1374 if (ISSET(tp
->t_iflag
, IXOFF
)) {
1376 * XXX wait a bit in the hope that the stop
1377 * character (if any) will go out. Waiting
1378 * isn't good since it allows races. This
1379 * will be fixed when the stop character is
1380 * put in a special queue. Don't bother with
1381 * the checks in ttywait() since the timeout
1384 SET(tp
->t_state
, TS_SO_OCOMPLETE
);
1385 ttysleep(tp
, TSA_OCOMPLETE(tp
), 0,
1388 * Don't try sending the stop character again.
1390 CLR(tp
->t_state
, TS_TBLOCK
);
1397 FLUSHQ(&tp
->t_outq
);
1404 * Copy in the default termios characters.
1407 termioschars(struct termios
*t
)
1410 bcopy(ttydefchars
, t
->c_cc
, sizeof t
->c_cc
);
1417 ttychars(struct tty
*tp
)
1420 termioschars(&tp
->t_termios
);
1424 * Handle input high water. Send stop character for the IXOFF case. Turn
1425 * on our input flow control bit and propagate the changes to the driver.
1426 * XXX the stop character should be put in a special high priority queue.
1429 ttyblock(struct tty
*tp
)
1432 SET(tp
->t_state
, TS_TBLOCK
);
1433 if (ISSET(tp
->t_iflag
, IXOFF
) && tp
->t_cc
[VSTOP
] != _POSIX_VDISABLE
&&
1434 clist_putc(tp
->t_cc
[VSTOP
], &tp
->t_outq
) != 0)
1435 CLR(tp
->t_state
, TS_TBLOCK
); /* try again later */
1440 * Handle input low water. Send start character for the IXOFF case. Turn
1441 * off our input flow control bit and propagate the changes to the driver.
1442 * XXX the start character should be put in a special high priority queue.
1445 ttyunblock(struct tty
*tp
)
1448 CLR(tp
->t_state
, TS_TBLOCK
);
1449 if (ISSET(tp
->t_iflag
, IXOFF
) && tp
->t_cc
[VSTART
] != _POSIX_VDISABLE
&&
1450 clist_putc(tp
->t_cc
[VSTART
], &tp
->t_outq
) != 0)
1451 SET(tp
->t_state
, TS_TBLOCK
); /* try again later */
1456 /* Not used by any current (i386) drivers. */
1458 * Restart after an inter-char delay.
1461 ttrstrt(void *tp_arg
)
1465 KASSERT(tp_arg
!= NULL
, ("ttrstrt"));
1469 CLR(tp
->t_state
, TS_TIMEOUT
);
1476 ttstart(struct tty
*tp
)
1479 if (tp
->t_oproc
!= NULL
) /* XXX: Kludge for pty. */
1485 * "close" a line discipline
1488 ttylclose(struct tty
*tp
, int flag
)
1491 if (flag
& FNONBLOCK
|| ttywflush(tp
))
1492 ttyflush(tp
, FREAD
| FWRITE
);
1497 * Handle modem control transition on a tty.
1498 * Flag indicates new state of carrier.
1499 * Returns 0 if the line should be turned off, otherwise 1.
1502 ttymodem(struct tty
*tp
, int flag
)
1505 if (ISSET(tp
->t_state
, TS_CARR_ON
) && ISSET(tp
->t_cflag
, MDMBUF
)) {
1507 * MDMBUF: do flow control according to carrier flag
1508 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1509 * works if IXON and IXANY are clear.
1512 CLR(tp
->t_state
, TS_CAR_OFLOW
);
1513 CLR(tp
->t_state
, TS_TTSTOP
);
1515 } else if (!ISSET(tp
->t_state
, TS_CAR_OFLOW
)) {
1516 SET(tp
->t_state
, TS_CAR_OFLOW
);
1517 SET(tp
->t_state
, TS_TTSTOP
);
1518 (*tp
->t_stop
)(tp
, 0);
1520 } else if (flag
== 0) {
1524 CLR(tp
->t_state
, TS_CARR_ON
);
1525 if (ISSET(tp
->t_state
, TS_ISOPEN
) &&
1526 !ISSET(tp
->t_cflag
, CLOCAL
)) {
1527 SET(tp
->t_state
, TS_ZOMBIE
);
1528 CLR(tp
->t_state
, TS_CONNECTED
);
1529 if (tp
->t_session
&& tp
->t_session
->s_leader
)
1530 ksignal(tp
->t_session
->s_leader
, SIGHUP
);
1531 ttyflush(tp
, FREAD
| FWRITE
);
1538 SET(tp
->t_state
, TS_CARR_ON
);
1539 if (!ISSET(tp
->t_state
, TS_ZOMBIE
))
1540 SET(tp
->t_state
, TS_CONNECTED
);
1541 wakeup(TSA_CARR_ON(tp
));
1549 * Reinput pending characters after state switch
1550 * call from a critical section.
1553 ttypend(struct tty
*tp
)
1558 CLR(tp
->t_lflag
, PENDIN
);
1559 SET(tp
->t_state
, TS_TYPEN
);
1561 * XXX this assumes too much about clist internals. It may even
1562 * fail if the cblock slush pool is empty. We can't allocate more
1563 * cblocks here because we are called from an interrupt handler
1564 * and clist_alloc_cblocks() can wait.
1567 bzero(&tp
->t_rawq
, sizeof tp
->t_rawq
);
1568 tp
->t_rawq
.c_cbmax
= tq
.c_cbmax
;
1569 tp
->t_rawq
.c_cbreserved
= tq
.c_cbreserved
;
1570 while ((c
= clist_getc(&tq
)) >= 0)
1572 CLR(tp
->t_state
, TS_TYPEN
);
1576 * Process a read call on a tty device.
1579 ttread(struct tty
*tp
, struct uio
*uio
, int flag
)
1584 cc_t
*cc
= tp
->t_cc
;
1587 int first
, error
= 0;
1588 int has_stime
= 0, last_cc
= 0;
1589 long slp
= 0; /* XXX this should be renamed `timo'. */
1590 struct timeval stime
;
1592 lp
= curthread
->td_lwp
;
1596 lflag
= tp
->t_lflag
;
1598 * take pending input first
1600 if (ISSET(lflag
, PENDIN
)) {
1602 splz(); /* reduce latency */
1603 lflag
= tp
->t_lflag
; /* XXX ttypend() clobbers it */
1607 * Hang process if it's in the background.
1609 if ((pp
= curproc
) && isbackground(pp
, tp
)) {
1611 if (SIGISMEMBER(pp
->p_sigignore
, SIGTTIN
) ||
1612 SIGISMEMBER(lp
->lwp_sigmask
, SIGTTIN
) ||
1613 (pp
->p_flag
& P_PPWAIT
) || pp
->p_pgrp
->pg_jobc
== 0)
1615 pgsignal(pp
->p_pgrp
, SIGTTIN
, 1);
1616 error
= ttysleep(tp
, &lbolt
, PCATCH
, "ttybg2", 0);
1622 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1624 return (0); /* EOF */
1628 * If canonical, use the canonical queue,
1629 * else use the raw queue.
1631 * (should get rid of clists...)
1633 qp
= ISSET(lflag
, ICANON
) ? &tp
->t_canq
: &tp
->t_rawq
;
1635 if (flag
& IO_NDELAY
) {
1638 if (!ISSET(lflag
, ICANON
) && cc
[VMIN
] == 0) {
1643 return (EWOULDBLOCK
);
1645 if (!ISSET(lflag
, ICANON
)) {
1648 struct timeval timecopy
;
1651 * Check each of the four combinations.
1652 * (m > 0 && t == 0) is the normal read case.
1653 * It should be fairly efficient, so we check that and its
1654 * companion case (m == 0 && t == 0) first.
1655 * For the other two cases, we compute the target sleep time
1664 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1668 t
*= 100000; /* time in us */
1669 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1670 ((t1).tv_usec - (t2).tv_usec))
1676 getmicrotime(&timecopy
);
1678 /* first character, start timer */
1682 } else if (qp
->c_cc
> last_cc
) {
1683 /* got a character, restart timer */
1687 /* nothing, check expiration */
1688 slp
= t
- diff(timecopy
, stime
);
1693 } else { /* m == 0 */
1696 getmicrotime(&timecopy
);
1702 slp
= t
- diff(timecopy
, stime
);
1704 /* Timed out, but 0 is enough input. */
1712 * Rounding down may make us wake up just short
1713 * of the target, so we round up.
1714 * The formula is ceiling(slp * hz/1000000).
1715 * 32-bit arithmetic is enough for hz < 169.
1716 * XXX see tvtohz() for how to avoid overflow if hz
1717 * is large (divide by `tick' and/or arrange to
1718 * use tvtohz() if hz is large).
1720 slp
= (long) (((u_long
)slp
* hz
) + 999999) / 1000000;
1723 if (qp
->c_cc
<= 0) {
1726 * There is no input, or not enough input and we can block.
1728 error
= ttysleep(tp
, TSA_HUP_OR_INPUT(tp
), PCATCH
,
1729 ISSET(tp
->t_state
, TS_CONNECTED
) ?
1730 "ttyin" : "ttyhup", (int)slp
);
1732 if (error
== EWOULDBLOCK
)
1737 * XXX what happens if another process eats some input
1738 * while we are asleep (not just here)? It would be
1739 * safest to detect changes and reset our state variables
1740 * (has_stime and last_cc).
1748 * Input present, check for input mapping and processing.
1751 if (ISSET(lflag
, ICANON
| ISIG
))
1757 icc
= imin(uio
->uio_resid
, IBUFSIZ
);
1758 icc
= q_to_b(qp
, ibuf
, icc
);
1764 error
= uiomove(ibuf
, icc
, uio
);
1766 * XXX if there was an error then we should ungetc() the
1767 * unmoved chars and reduce icc here.
1771 if (uio
->uio_resid
== 0)
1785 * delayed suspend (^Y)
1787 if (CCEQ(cc
[VDSUSP
], c
) &&
1788 ISSET(lflag
, IEXTEN
| ISIG
) == (IEXTEN
| ISIG
)) {
1789 pgsignal(tp
->t_pgrp
, SIGTSTP
, 1);
1791 error
= ttysleep(tp
, &lbolt
, PCATCH
,
1800 * Interpret EOF only in canonical mode.
1802 if (CCEQ(cc
[VEOF
], c
) && ISSET(lflag
, ICANON
))
1805 * Give user character.
1807 error
= ureadc(c
, uio
);
1809 /* XXX should ungetc(c, qp). */
1811 if (uio
->uio_resid
== 0)
1814 * In canonical mode check for a "break character"
1815 * marking the end of a "line of input".
1817 if (ISSET(lflag
, ICANON
) && TTBREAKC(c
, lflag
))
1824 * Look to unblock input now that (presumably)
1825 * the input queue has gone down.
1828 if (ISSET(tp
->t_state
, TS_TBLOCK
) &&
1829 tp
->t_rawq
.c_cc
+ tp
->t_canq
.c_cc
<= tp
->t_ilowat
)
1837 * Check the output queue on tp for space for a kernel message (from uprintf
1838 * or tprintf). Allow some space over the normal hiwater mark so we don't
1839 * lose messages due to normal flow control, but don't let the tty run amok.
1840 * Sleeps here are not interruptible, but we return prematurely if new signals
1844 ttycheckoutq(struct tty
*tp
, int wait
)
1846 struct lwp
*lp
= curthread
->td_lwp
;
1848 sigset_t oldset
, newset
;
1850 hiwat
= tp
->t_ohiwat
;
1851 SIGEMPTYSET(oldset
);
1852 SIGEMPTYSET(newset
);
1855 oldset
= lwp_sigpend(lp
);
1856 if (tp
->t_outq
.c_cc
> hiwat
+ OBUFSIZ
+ 100) {
1857 while (tp
->t_outq
.c_cc
> hiwat
) {
1859 if (tp
->t_outq
.c_cc
<= hiwat
)
1862 newset
= lwp_sigpend(lp
);
1863 if (!wait
|| SIGSETNEQ(oldset
, newset
)) {
1867 SET(tp
->t_state
, TS_SO_OLOWAT
);
1868 tsleep(TSA_OLOWAT(tp
), 0, "ttoutq", hz
);
1876 * Process a write call on a tty device.
1879 ttwrite(struct tty
*tp
, struct uio
*uio
, int flag
)
1885 int i
, hiwat
, cnt
, error
;
1888 lp
= curthread
->td_lwp
;
1889 hiwat
= tp
->t_ohiwat
;
1890 cnt
= uio
->uio_resid
;
1895 if (ISSET(tp
->t_state
, TS_ZOMBIE
)) {
1897 if (uio
->uio_resid
== cnt
)
1901 if (!ISSET(tp
->t_state
, TS_CONNECTED
)) {
1902 if (flag
& IO_NDELAY
) {
1904 error
= EWOULDBLOCK
;
1907 error
= ttysleep(tp
, TSA_CARR_ON(tp
), PCATCH
, "ttydcd", 0);
1916 * Hang the process if it's in the background.
1918 if ((pp
= curproc
) && isbackground(pp
, tp
) &&
1919 ISSET(tp
->t_lflag
, TOSTOP
) && !(pp
->p_flag
& P_PPWAIT
) &&
1920 !SIGISMEMBER(pp
->p_sigignore
, SIGTTOU
) &&
1921 !SIGISMEMBER(lp
->lwp_sigmask
, SIGTTOU
)) {
1922 if (pp
->p_pgrp
->pg_jobc
== 0) {
1926 pgsignal(pp
->p_pgrp
, SIGTTOU
, 1);
1927 error
= ttysleep(tp
, &lbolt
, PCATCH
, "ttybg4", 0);
1933 * Process the user's data in at most OBUFSIZ chunks. Perform any
1934 * output translation. Keep track of high water mark, sleep on
1935 * overflow awaiting device aid in acquiring new space.
1937 while (uio
->uio_resid
> 0 || cc
> 0) {
1938 if (ISSET(tp
->t_lflag
, FLUSHO
)) {
1942 if (tp
->t_outq
.c_cc
> hiwat
)
1945 * Grab a hunk of data from the user, unless we have some
1946 * leftover from last time.
1949 cc
= imin(uio
->uio_resid
, OBUFSIZ
);
1951 error
= uiomove(cp
, cc
, uio
);
1958 * If nothing fancy need be done, grab those characters we
1959 * can handle without any of ttyoutput's processing and
1960 * just transfer them to the output q. For those chars
1961 * which require special processing (as indicated by the
1962 * bits in char_type), call ttyoutput. After processing
1963 * a hunk of data, look for FLUSHO so ^O's will take effect
1967 if (!ISSET(tp
->t_oflag
, OPOST
))
1970 ce
= cc
- scanc((u_int
)cc
, (u_char
*)cp
,
1971 char_type
, CCLASSMASK
);
1973 * If ce is zero, then we're processing
1974 * a special character through ttyoutput.
1978 if (ttyoutput(*cp
, tp
) >= 0) {
1979 /* No Clists, wait a bit. */
1981 if (flag
& IO_NDELAY
) {
1982 error
= EWOULDBLOCK
;
1985 error
= ttysleep(tp
, &lbolt
,
1994 if (ISSET(tp
->t_lflag
, FLUSHO
) ||
1995 tp
->t_outq
.c_cc
> hiwat
)
2001 * A bunch of normal characters have been found.
2002 * Transfer them en masse to the output queue and
2003 * continue processing at the top of the loop.
2004 * If there are any further characters in this
2005 * <= OBUFSIZ chunk, the first should be a character
2006 * requiring special handling by ttyoutput.
2009 i
= b_to_q(cp
, ce
, &tp
->t_outq
);
2012 cp
+= ce
, cc
-= ce
, tk_nout
+= ce
;
2015 /* No Clists, wait a bit. */
2017 if (flag
& IO_NDELAY
) {
2018 error
= EWOULDBLOCK
;
2021 error
= ttysleep(tp
, &lbolt
, PCATCH
,
2027 if (ISSET(tp
->t_lflag
, FLUSHO
) ||
2028 tp
->t_outq
.c_cc
> hiwat
)
2035 * If cc is nonzero, we leave the uio structure inconsistent, as the
2036 * offset and iov pointers have moved forward, but it doesn't matter
2037 * (the call will either return short or restart with a new uio).
2039 uio
->uio_resid
+= cc
;
2046 * This can only occur if FLUSHO is set in t_lflag,
2047 * or if ttstart/oproc is synchronous (or very fast).
2049 if (tp
->t_outq
.c_cc
<= hiwat
) {
2053 if (flag
& IO_NDELAY
) {
2055 uio
->uio_resid
+= cc
;
2056 return (uio
->uio_resid
== cnt
? EWOULDBLOCK
: 0);
2058 SET(tp
->t_state
, TS_SO_OLOWAT
);
2059 error
= ttysleep(tp
, TSA_OLOWAT(tp
), PCATCH
, "ttywri", tp
->t_timeout
);
2061 if (error
== EWOULDBLOCK
)
2069 * Rubout one character from the rawq of tp
2070 * as cleanly as possible.
2073 ttyrub(int c
, struct tty
*tp
)
2079 if (!ISSET(tp
->t_lflag
, ECHO
) || ISSET(tp
->t_lflag
, EXTPROC
))
2081 CLR(tp
->t_lflag
, FLUSHO
);
2082 if (ISSET(tp
->t_lflag
, ECHOE
)) {
2083 if (tp
->t_rocount
== 0) {
2085 * Screwed by ttwrite; retype
2090 if (c
== ('\t' | TTY_QUOTE
) || c
== ('\n' | TTY_QUOTE
))
2093 CLR(c
, ~TTY_CHARMASK
);
2094 switch (CCLASS(c
)) {
2103 if (ISSET(tp
->t_lflag
, ECHOCTL
))
2107 if (tp
->t_rocount
< tp
->t_rawq
.c_cc
) {
2112 savecol
= tp
->t_column
;
2113 SET(tp
->t_state
, TS_CNTTB
);
2114 SET(tp
->t_lflag
, FLUSHO
);
2115 tp
->t_column
= tp
->t_rocol
;
2116 cp
= tp
->t_rawq
.c_cf
;
2118 tabc
= *cp
; /* XXX FIX NEXTC */
2119 for (; cp
; cp
= nextc(&tp
->t_rawq
, cp
, &tabc
))
2121 CLR(tp
->t_lflag
, FLUSHO
);
2122 CLR(tp
->t_state
, TS_CNTTB
);
2125 /* savecol will now be length of the tab. */
2126 savecol
-= tp
->t_column
;
2127 tp
->t_column
+= savecol
;
2129 savecol
= 8; /* overflow screw */
2130 while (--savecol
>= 0)
2131 (void)ttyoutput('\b', tp
);
2134 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2135 (void)kprintf(PANICSTR
, c
, CCLASS(c
));
2137 panic(PANICSTR
, c
, CCLASS(c
));
2141 } else if (ISSET(tp
->t_lflag
, ECHOPRT
)) {
2142 if (!ISSET(tp
->t_state
, TS_ERASE
)) {
2143 SET(tp
->t_state
, TS_ERASE
);
2144 (void)ttyoutput('\\', tp
);
2148 ttyecho(tp
->t_cc
[VERASE
], tp
);
2150 * This code may be executed not only when an ERASE key
2151 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2152 * So, I didn't think it was worthwhile to pass the extra
2153 * information (which would need an extra parameter,
2154 * changing every call) needed to distinguish the ERASE2
2155 * case from the ERASE.
2162 * Back over cnt characters, erasing them.
2165 ttyrubo(struct tty
*tp
, int cnt
)
2169 (void)ttyoutput('\b', tp
);
2170 (void)ttyoutput(' ', tp
);
2171 (void)ttyoutput('\b', tp
);
2177 * Reprint the rawq line. Note, it is assumed that c_cc has already
2181 ttyretype(struct tty
*tp
)
2186 /* Echo the reprint character. */
2187 if (tp
->t_cc
[VREPRINT
] != _POSIX_VDISABLE
)
2188 ttyecho(tp
->t_cc
[VREPRINT
], tp
);
2190 (void)ttyoutput('\n', tp
);
2194 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2195 * BIT OF FIRST CHAR.
2198 for (cp
= tp
->t_canq
.c_cf
, c
= (cp
!= NULL
? *cp
: 0);
2199 cp
!= NULL
; cp
= nextc(&tp
->t_canq
, cp
, &c
))
2201 for (cp
= tp
->t_rawq
.c_cf
, c
= (cp
!= NULL
? *cp
: 0);
2202 cp
!= NULL
; cp
= nextc(&tp
->t_rawq
, cp
, &c
))
2204 CLR(tp
->t_state
, TS_ERASE
);
2207 tp
->t_rocount
= tp
->t_rawq
.c_cc
;
2212 * Echo a typed character to the terminal.
2215 ttyecho(int c
, struct tty
*tp
)
2218 if (!ISSET(tp
->t_state
, TS_CNTTB
))
2219 CLR(tp
->t_lflag
, FLUSHO
);
2220 if ((!ISSET(tp
->t_lflag
, ECHO
) &&
2221 (c
!= '\n' || !ISSET(tp
->t_lflag
, ECHONL
))) ||
2222 ISSET(tp
->t_lflag
, EXTPROC
))
2224 if (ISSET(tp
->t_lflag
, ECHOCTL
) &&
2225 ((ISSET(c
, TTY_CHARMASK
) <= 037 && c
!= '\t' && c
!= '\n') ||
2226 ISSET(c
, TTY_CHARMASK
) == 0177)) {
2227 (void)ttyoutput('^', tp
);
2228 CLR(c
, ~TTY_CHARMASK
);
2234 (void)ttyoutput(c
, tp
);
2238 * Wake up any readers on a tty.
2241 ttwakeup(struct tty
*tp
)
2244 if (tp
->t_rsel
.si_pid
!= 0)
2245 selwakeup(&tp
->t_rsel
);
2246 if (ISSET(tp
->t_state
, TS_ASYNC
) && tp
->t_sigio
!= NULL
)
2247 pgsigio(tp
->t_sigio
, SIGIO
, (tp
->t_session
!= NULL
));
2248 wakeup(TSA_HUP_OR_INPUT(tp
));
2249 KNOTE(&tp
->t_rsel
.si_note
, 0);
2253 * Wake up any writers on a tty.
2256 ttwwakeup(struct tty
*tp
)
2259 if (tp
->t_wsel
.si_pid
!= 0 && tp
->t_outq
.c_cc
<= tp
->t_olowat
)
2260 selwakeup(&tp
->t_wsel
);
2261 if (ISSET(tp
->t_state
, TS_ASYNC
) && tp
->t_sigio
!= NULL
)
2262 pgsigio(tp
->t_sigio
, SIGIO
, (tp
->t_session
!= NULL
));
2263 if (ISSET(tp
->t_state
, TS_BUSY
| TS_SO_OCOMPLETE
) ==
2264 TS_SO_OCOMPLETE
&& tp
->t_outq
.c_cc
== 0) {
2265 CLR(tp
->t_state
, TS_SO_OCOMPLETE
);
2266 wakeup(TSA_OCOMPLETE(tp
));
2268 if (ISSET(tp
->t_state
, TS_SO_OLOWAT
) &&
2269 tp
->t_outq
.c_cc
<= tp
->t_olowat
) {
2270 CLR(tp
->t_state
, TS_SO_OLOWAT
);
2271 wakeup(TSA_OLOWAT(tp
));
2273 KNOTE(&tp
->t_wsel
.si_note
, 0);
2277 * Look up a code for a specified speed in a conversion table;
2278 * used by drivers to map software speed values to hardware parameters.
2281 ttspeedtab(int speed
, struct speedtab
*table
)
2284 for ( ; table
->sp_speed
!= -1; table
++)
2285 if (table
->sp_speed
== speed
)
2286 return (table
->sp_code
);
2291 * Set input and output watermarks and buffer sizes. For input, the
2292 * high watermark is about one second's worth of input above empty, the
2293 * low watermark is slightly below high water, and the buffer size is a
2294 * driver-dependent amount above high water. For output, the watermarks
2295 * are near the ends of the buffer, with about 1 second's worth of input
2296 * between them. All this only applies to the standard line discipline.
2299 ttsetwater(struct tty
*tp
)
2301 int cps
, ttmaxhiwat
, x
;
2304 clist_alloc_cblocks(&tp
->t_canq
, TTYHOG
, 512);
2305 switch (tp
->t_ispeedwat
) {
2307 cps
= tp
->t_ispeed
/ 10;
2311 * This case is for old drivers that don't know about
2312 * t_ispeedwat. Arrange for them to get the old buffer
2313 * sizes and watermarks.
2315 cps
= TTYHOG
- 2 * 256;
2316 tp
->t_ififosize
= 2 * 2048;
2319 cps
= tp
->t_ispeedwat
/ 10;
2323 tp
->t_ilowat
= 7 * cps
/ 8;
2324 x
= cps
+ tp
->t_ififosize
;
2325 clist_alloc_cblocks(&tp
->t_rawq
, x
, x
);
2328 switch (tp
->t_ospeedwat
) {
2330 cps
= tp
->t_ospeed
/ 10;
2331 ttmaxhiwat
= 2 * TTMAXHIWAT
;
2334 cps
= tp
->t_ospeed
/ 10;
2335 ttmaxhiwat
= TTMAXHIWAT
;
2338 cps
= tp
->t_ospeedwat
/ 10;
2339 ttmaxhiwat
= 8 * TTMAXHIWAT
;
2342 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2343 tp
->t_olowat
= x
= CLAMP(cps
/ 2, TTMAXLOWAT
, TTMINLOWAT
);
2345 x
= CLAMP(x
, ttmaxhiwat
, TTMINHIWAT
); /* XXX clamps are too magic */
2346 tp
->t_ohiwat
= roundup(x
, CBSIZE
); /* XXX for compat */
2347 x
= imax(tp
->t_ohiwat
, TTMAXHIWAT
); /* XXX for compat/safety */
2349 clist_alloc_cblocks(&tp
->t_outq
, x
, x
);
2354 * Report on state of foreground process group.
2357 ttyinfo(struct tty
*tp
)
2359 struct proc
*p
, *pick
;
2364 if (ttycheckoutq(tp
,0) == 0)
2368 * We always print the load average, then figure out what else to
2369 * print based on the state of the current process group.
2371 tmp
= (averunnable
.ldavg
[0] * 100 + FSCALE
/ 2) >> FSHIFT
;
2372 ttyprintf(tp
, "load: %d.%02d ", tmp
/ 100, tmp
% 100);
2374 if (tp
->t_session
== NULL
) {
2375 ttyprintf(tp
, "not a controlling terminal\n");
2376 } else if (tp
->t_pgrp
== NULL
) {
2377 ttyprintf(tp
, "no foreground process group\n");
2378 } else if ((p
= LIST_FIRST(&tp
->t_pgrp
->pg_members
)) == 0) {
2379 ttyprintf(tp
, "empty foreground process group\n");
2382 * Pick an interesting process. Note that certain elements,
2383 * in particular the wmesg, require a critical section for
2384 * safe access (YYY and we are still not MP safe).
2386 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2395 /* XXX lwp should compare lwps */
2397 for (pick
= NULL
; p
!= 0; p
= LIST_NEXT(p
, p_pglist
)) {
2398 if (proc_compare(pick
, p
))
2403 lp
= FIRST_LWP_IN_PROC(pick
);
2405 ttyprintf(tp
, "foreground process without lwp\n");
2412 * Figure out what wait/process-state message, and command
2416 * XXX lwp This is a horrible mixture. We need to rework this
2417 * as soon as lwps have their own runnable status.
2419 if (pick
->p_flag
& P_WEXIT
)
2421 else if (lp
->lwp_stat
== LSRUN
)
2423 else if (pick
->p_stat
== SIDL
)
2425 else if (lp
->lwp_wmesg
) /* lwp_thread must not be NULL */
2426 str
= lp
->lwp_wmesg
;
2430 ksnprintf(buf
, sizeof(buf
), "cmd: %s %d [%s]",
2431 pick
->p_comm
, pick
->p_pid
, str
);
2434 * Calculate cpu usage, percent cpu, and cmsz. Note that
2435 * 'pick' becomes invalid the moment we exit the critical
2438 if (lp
->lwp_thread
&& (pick
->p_flag
& P_SWAPPEDOUT
) == 0)
2439 calcru_proc(pick
, &ru
);
2441 pctcpu
= (lp
->lwp_pctcpu
* 10000 + FSCALE
/ 2) >> FSHIFT
;
2443 if (pick
->p_stat
== SIDL
|| pick
->p_stat
== SZOMB
)
2446 vmsz
= pgtok(vmspace_resident_count(pick
->p_vmspace
));
2453 ttyprintf(tp
, " %s ", buf
);
2454 ttyprintf(tp
, "%ld.%02ldu ",
2455 ru
.ru_utime
.tv_sec
, ru
.ru_utime
.tv_usec
/ 10000);
2456 ttyprintf(tp
, "%ld.%02lds ",
2457 ru
.ru_stime
.tv_sec
, ru
.ru_stime
.tv_usec
/ 10000);
2458 ttyprintf(tp
, "%d%% %ldk\n", pctcpu
/ 100, vmsz
);
2460 tp
->t_rocount
= 0; /* so pending input will be retyped if BS */
2464 * Returns 1 if p2 is "better" than p1
2466 * The algorithm for picking the "interesting" process is thus:
2468 * 1) Only foreground processes are eligible - implied.
2469 * 2) Runnable processes are favored over anything else. The runner
2470 * with the highest cpu utilization is picked (p_cpticks). Ties are
2471 * broken by picking the highest pid.
2472 * 3) The sleeper with the shortest sleep time is next. With ties,
2473 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2474 * 4) Further ties are broken by picking the highest pid.
2476 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2477 #define TESTAB(a, b) ((a)<<1 | (b))
2483 proc_compare(struct proc
*p1
, struct proc
*p2
)
2485 struct lwp
*lp1
, *lp2
;
2492 switch (TESTAB(p1
->p_stat
== SZOMB
, p2
->p_stat
== SZOMB
)) {
2498 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2502 lp1
= FIRST_LWP_IN_PROC(p1
);
2503 lp2
= FIRST_LWP_IN_PROC(p2
);
2506 * see if at least one of them is runnable
2508 switch (TESTAB(ISRUN(lp1
), ISRUN(lp2
))) {
2515 * tie - favor one with highest recent cpu utilization
2517 if (lp2
->lwp_cpticks
> lp1
->lwp_cpticks
)
2519 if (lp1
->lwp_cpticks
> lp2
->lwp_cpticks
)
2521 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2524 * pick the one with the smallest sleep time
2526 if (lp2
->lwp_slptime
> lp1
->lwp_slptime
)
2528 if (lp1
->lwp_slptime
> lp2
->lwp_slptime
)
2531 * favor one sleeping in a non-interruptible sleep
2533 if (lp1
->lwp_flag
& LWP_SINTR
&& (lp2
->lwp_flag
& LWP_SINTR
) == 0)
2535 if (lp2
->lwp_flag
& LWP_SINTR
&& (lp1
->lwp_flag
& LWP_SINTR
) == 0)
2537 return (p2
->p_pid
> p1
->p_pid
); /* tie - return highest pid */
2541 * Output char to tty; console putchar style.
2544 tputchar(int c
, struct tty
*tp
)
2547 if (!ISSET(tp
->t_state
, TS_CONNECTED
)) {
2552 (void)ttyoutput('\r', tp
);
2553 (void)ttyoutput(c
, tp
);
2560 * Sleep on chan, returning ERESTART if tty changed while we napped and
2561 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2562 * the tty is revoked, restarting a pending call will redo validation done
2563 * at the start of the call.
2566 ttysleep(struct tty
*tp
, void *chan
, int slpflags
, char *wmesg
, int timo
)
2572 error
= tsleep(chan
, slpflags
, wmesg
, timo
);
2575 return (tp
->t_gen
== gen
? 0 : ERESTART
);
2579 * Allocate a tty struct. Clists in the struct will be allocated by
2583 ttymalloc(struct tty
*tp
)
2588 tp
= kmalloc(sizeof *tp
, M_TTYS
, M_WAITOK
|M_ZERO
);
2595 * Free a tty struct. Clists in the struct should have been freed by
2598 * XXX not yet usable: since we support a half-closed state and do not
2599 * ref count the tty reference from the session, it is possible for a
2600 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2603 ttyfree(struct tty
*tp
)
2610 ttyregister(struct tty
*tp
)
2612 SLIST_INSERT_HEAD(&tty_list
, tp
, t_list
);
2616 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS
)
2620 SLIST_FOREACH(tp
, &tty_list
, t_list
) {
2623 t
.t_dev
= (cdev_t
)dev2udev(t
.t_dev
);
2624 error
= SYSCTL_OUT(req
, (caddr_t
)&t
, sizeof(t
));
2631 SYSCTL_PROC(_kern
, OID_AUTO
, ttys
, CTLTYPE_OPAQUE
|CTLFLAG_RD
,
2632 0, 0, sysctl_kern_ttys
, "S,tty", "All struct ttys");
2635 nottystop(struct tty
*tp
, int rw
)
2642 ttyread(struct dev_read_args
*ap
)
2646 tp
= ap
->a_head
.a_dev
->si_tty
;
2649 return ((*linesw
[tp
->t_line
].l_read
)(tp
, ap
->a_uio
, ap
->a_ioflag
));
2653 ttywrite(struct dev_write_args
*ap
)
2657 tp
= ap
->a_head
.a_dev
->si_tty
;
2660 return ((*linesw
[tp
->t_line
].l_write
)(tp
, ap
->a_uio
, ap
->a_ioflag
));