4 * Copyright (c) 1982, 1986, 1990, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * @(#)tty.c 8.8 (Berkeley) 1/21/94
41 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
46 * Almost all functions in this file are acquiring the tty token due to their
47 * access and modifications of the 'tp' (struct tty) objects.
52 * o Fix races for sending the start char in ttyflush().
53 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
54 * With luck, there will be MIN chars before select() returns().
55 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
56 * o Don't allow input in TS_ZOMBIE case. It would be visible through
58 * o Do the new sio locking stuff here and use it to avoid special
61 * o Move EXTPROC and/or PENDIN to t_state?
62 * o Wrap most of ttioctl in spltty/splx.
63 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
64 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
65 * o Don't allow certain termios flags to affect disciplines other
66 * than TTYDISC. Cancel their effects before switch disciplines
67 * and ignore them if they are set while we are in another
69 * o Now that historical speed conversions are handled here, don't
71 * o Check for TS_CARR_ON being set while everything is closed and not
72 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
73 * so it would live until the next open even if carrier drops.
74 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
75 * only when _all_ openers leave open().
78 #include "opt_compat.h"
79 #include "opt_uconsole.h"
81 #include <sys/param.h>
82 #include <sys/systm.h>
83 #include <sys/filio.h>
84 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
85 #include <sys/ioctl_compat.h>
91 #include <sys/clist.h>
93 #include <sys/fcntl.h>
95 #include <sys/dkstat.h>
96 #include <sys/kernel.h>
97 #include <sys/vnode.h>
98 #include <sys/signalvar.h>
99 #include <sys/signal2.h>
100 #include <sys/resourcevar.h>
101 #include <sys/malloc.h>
102 #include <sys/filedesc.h>
103 #include <sys/sysctl.h>
104 #include <sys/thread2.h>
107 #include <sys/lock.h>
109 #include <vm/vm_map.h>
111 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
113 static int proc_compare (struct proc *p1, struct proc *p2);
114 static int ttnread (struct tty *tp);
115 static void ttyecho (int c, struct tty *tp);
116 static int ttyoutput (int c, struct tty *tp);
117 static void ttypend (struct tty *tp);
118 static void ttyretype (struct tty *tp);
119 static void ttyrub (int c, struct tty *tp);
120 static void ttyrubo (struct tty *tp, int cnt);
121 static void ttyunblock (struct tty *tp);
122 static int ttywflush (struct tty *tp);
123 static int filt_ttyread (struct knote *kn, long hint);
124 static void filt_ttyrdetach (struct knote *kn);
125 static int filt_ttywrite (struct knote *kn, long hint);
126 static void filt_ttywdetach (struct knote *kn);
129 * Table with character classes and parity. The 8th bit indicates parity,
130 * the 7th bit indicates the character is an alphameric or underscore (for
131 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
132 * are 0 then the character needs no special processing on output; classes
133 * other than 0 might be translated or (not currently) require delays.
135 #define E 0x00 /* Even parity. */
136 #define O 0x80 /* Odd parity. */
137 #define PARITY(c) (char_type[c] & O)
139 #define ALPHA 0x40 /* Alpha or underscore. */
140 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
142 #define CCLASSMASK 0x3f
143 #define CCLASS(c) (char_type[c] & CCLASSMASK)
148 #define NA ORDINARY | ALPHA
154 static u_char const char_type[] = {
155 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
156 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
157 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
158 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
159 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
160 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
161 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
162 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
163 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
164 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
165 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
166 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
167 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
168 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
169 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
170 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
172 * Meta chars; should be settable per character set;
173 * for now, treat them all as normal characters.
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,
185 NA, NA, NA, NA, NA, NA, NA, NA,
186 NA, NA, NA, NA, NA, NA, NA, NA,
187 NA, NA, NA, NA, NA, NA, NA, NA,
188 NA, NA, NA, NA, NA, NA, NA, NA,
189 NA, NA, NA, NA, NA, NA, NA, NA,
190 NA, NA, NA, NA, NA, NA, NA, NA,
201 /* Macros to clear/set/test flags. */
202 #define SET(t, f) (t) |= (f)
203 #define CLR(t, f) (t) &= ~(f)
204 #define ISSET(t, f) ((t) & (f))
206 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
207 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
210 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
211 "LU", "TTY input statistic");
213 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
214 "LU", "TTY output statistic");
218 * list of struct tty where pstat(8) can pick it up with sysctl
220 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
223 * Initial open of tty, or (re)entry to standard tty line discipline.
226 ttyopen(cdev_t device, struct tty *tp)
229 lwkt_gettoken(&tty_token);
231 if (!ISSET(tp->t_state, TS_ISOPEN)) {
232 SET(tp->t_state, TS_ISOPEN);
233 if (ISSET(tp->t_cflag, CLOCAL)) {
234 SET(tp->t_state, TS_CONNECTED);
236 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
239 lwkt_reltoken(&tty_token);
245 * Handle close() on a tty line: flush and set to initial state,
246 * bumping generation number so that pending read/write calls
247 * can detect recycling of the tty.
249 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
250 * and l_close() should have flushed, but we repeat the spltty() and
251 * the flush in case there are buggy callers.
254 ttyclose(struct tty *tp)
257 lwkt_gettoken(&tty_token);
258 funsetown(&tp->t_sigio);
262 ttyflush(tp, FREAD | FWRITE);
263 clist_free_cblocks(&tp->t_canq);
264 clist_free_cblocks(&tp->t_outq);
265 clist_free_cblocks(&tp->t_rawq);
268 tp->t_line = TTYDISC;
270 tp->t_state &= TS_REGISTERED; /* clear all bits except */
271 lwkt_reltoken(&tty_token);
277 * Disassociate the tty from its session. Traditionally this has only been
278 * a half-close, meaning that the session was still allowed to point at the
279 * tty (resulting in the tty in the ps command showing something like 'p0-'),
280 * even though the tty is no longer pointing at the session.
282 * The half close seems to be useful only for 'ps' output but there is as
283 * yet no reason to remove the feature. The full-close code is currently
284 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
287 ttyclearsession(struct tty *tp)
292 lwkt_gettoken(&tty_token);
300 if ((sp = tp->t_session) != NULL) {
301 tp->t_session = NULL;
302 #ifdef TTY_DO_FULL_CLOSE
303 /* FULL CLOSE (not yet) */
304 if (sp->s_ttyp == tp) {
308 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
309 "%p/%p\n", sp->s_ttyp, tp);
313 lwkt_reltoken(&tty_token);
317 * Release the tty vnode association for a session. This is the
318 * 'other half' of the close. Because multiple opens of /dev/tty
319 * only generate a single open to the actual tty, the file modes
320 * are locked to FREAD|FWRITE.
322 * If dorevoke is non-zero, the session is also revoked. We have to
323 * close the vnode if VCTTYISOPEN is set.
326 ttyclosesession(struct session *sp, int dorevoke)
330 lwkt_gettoken(&tty_token);
333 * There may not be a controlling terminal or it may have been closed
336 if ((vp = sp->s_ttyvp) == NULL) {
337 lwkt_reltoken(&tty_token);
342 * We need a lock if we have to close or revoke.
344 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
346 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
352 * Retry if the vnode was ripped out from under us
354 if (vp != sp->s_ttyvp) {
361 * Close and revoke as needed
364 if (vp->v_flag & VCTTYISOPEN) {
365 vclrflags(vp, VCTTYISOPEN);
366 VOP_CLOSE(vp, FREAD|FWRITE);
370 vrevoke(vp, proc0.p_ucred);
376 lwkt_reltoken(&tty_token);
379 #define FLUSHQ(q) { \
381 ndflush(q, (q)->c_cc); \
384 /* Is 'c' a line delimiter ("break" character)? */
385 #define TTBREAKC(c, lflag) \
386 ((c) == '\n' || (((c) == cc[VEOF] || \
387 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
388 (c) != _POSIX_VDISABLE))
391 * Process input of a single character received on a tty.
394 ttyinput(int c, struct tty *tp)
396 tcflag_t iflag, lflag;
400 lwkt_gettoken(&tty_token);
402 * If input is pending take it first.
405 if (ISSET(lflag, PENDIN))
410 if (ISSET(lflag, ICANON))
417 * Block further input iff:
418 * current input > threshold AND input is available to user program
419 * AND input flow control is enabled and not yet invoked.
420 * The 3 is slop for PARMRK.
423 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
424 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
425 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
426 !ISSET(tp->t_state, TS_TBLOCK))
429 /* Handle exceptional conditions (break, parity, framing). */
431 err = (ISSET(c, TTY_ERRORMASK));
433 CLR(c, TTY_ERRORMASK);
434 if (ISSET(err, TTY_BI)) {
435 if (ISSET(iflag, IGNBRK)) {
436 lwkt_reltoken(&tty_token);
439 if (ISSET(iflag, BRKINT)) {
440 ttyflush(tp, FREAD | FWRITE);
441 pgsignal(tp->t_pgrp, SIGINT, 1);
444 if (ISSET(iflag, PARMRK))
446 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
447 || ISSET(err, TTY_FE)) {
448 if (ISSET(iflag, IGNPAR)) {
449 lwkt_reltoken(&tty_token);
452 else if (ISSET(iflag, PARMRK)) {
454 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
457 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
458 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
459 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
466 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
468 if (!ISSET(lflag, EXTPROC)) {
470 * Check for literal nexting very first
472 if (ISSET(tp->t_state, TS_LNCH)) {
474 CLR(tp->t_state, TS_LNCH);
477 * Scan for special characters. This code
478 * is really just a big case statement with
479 * non-constant cases. The bottom of the
480 * case statement is labeled ``endcase'', so goto
481 * it after a case match, or similar.
485 * Control chars which aren't controlled
486 * by ICANON, ISIG, or IXON.
488 if (ISSET(lflag, IEXTEN)) {
489 if (CCEQ(cc[VLNEXT], c)) {
490 if (ISSET(lflag, ECHO)) {
491 if (ISSET(lflag, ECHOE)) {
492 (void)ttyoutput('^', tp);
493 (void)ttyoutput('\b', tp);
497 SET(tp->t_state, TS_LNCH);
500 if (CCEQ(cc[VDISCARD], c)) {
501 if (ISSET(lflag, FLUSHO))
502 CLR(tp->t_lflag, FLUSHO);
504 ttyflush(tp, FWRITE);
506 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
508 SET(tp->t_lflag, FLUSHO);
516 if (ISSET(lflag, ISIG)) {
517 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
518 if (!ISSET(lflag, NOFLSH))
519 ttyflush(tp, FREAD | FWRITE);
522 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
525 if (CCEQ(cc[VSUSP], c)) {
526 if (!ISSET(lflag, NOFLSH))
529 pgsignal(tp->t_pgrp, SIGTSTP, 1);
534 * Handle start/stop characters.
536 if (ISSET(iflag, IXON)) {
537 if (CCEQ(cc[VSTOP], c)) {
538 if (!ISSET(tp->t_state, TS_TTSTOP)) {
539 SET(tp->t_state, TS_TTSTOP);
540 (*tp->t_stop)(tp, 0);
541 lwkt_reltoken(&tty_token);
544 if (!CCEQ(cc[VSTART], c)) {
545 lwkt_reltoken(&tty_token);
549 * if VSTART == VSTOP then toggle
553 if (CCEQ(cc[VSTART], c))
557 * IGNCR, ICRNL, & INLCR
560 if (ISSET(iflag, IGNCR)) {
561 lwkt_reltoken(&tty_token);
564 else if (ISSET(iflag, ICRNL))
566 } else if (c == '\n' && ISSET(iflag, INLCR))
569 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
571 * From here on down canonical mode character
572 * processing takes place.
575 * erase or erase2 (^H / ^?)
577 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
579 ttyrub(clist_unputc(&tp->t_rawq), tp);
585 if (CCEQ(cc[VKILL], c)) {
586 if (ISSET(lflag, ECHOKE) &&
587 tp->t_rawq.c_cc == tp->t_rocount &&
588 !ISSET(lflag, ECHOPRT))
589 while (tp->t_rawq.c_cc)
590 ttyrub(clist_unputc(&tp->t_rawq), tp);
593 if (ISSET(lflag, ECHOK) ||
594 ISSET(lflag, ECHOKE))
599 CLR(tp->t_state, TS_LOCAL);
605 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
611 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
616 * erase last char of word and remember the
617 * next chars type (for ALTWERASE)
620 c = clist_unputc(&tp->t_rawq);
623 if (c == ' ' || c == '\t') {
624 clist_putc(c, &tp->t_rawq);
633 c = clist_unputc(&tp->t_rawq);
636 } while (c != ' ' && c != '\t' &&
637 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
638 clist_putc(c, &tp->t_rawq);
644 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
649 * ^T - kernel info and generate SIGINFO
651 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
652 if (ISSET(lflag, ISIG))
653 pgsignal(tp->t_pgrp, SIGINFO, 1);
654 if (!ISSET(lflag, NOKERNINFO))
658 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
659 if (ISSET(lflag, ISIG))
660 pgsignal(tp->t_pgrp, SIGCKPT, 1);
665 * Check for input buffer overflow
667 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
669 if (ISSET(iflag, IMAXBEL)) {
670 if (tp->t_outq.c_cc < tp->t_ohiwat)
671 (void)ttyoutput(CTRL('g'), tp);
676 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
677 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
678 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
681 * Put data char in q for user and
682 * wakeup on seeing a line delimiter.
684 if (clist_putc(c, &tp->t_rawq) >= 0) {
685 if (!ISSET(lflag, ICANON)) {
690 if (TTBREAKC(c, lflag)) {
692 catq(&tp->t_rawq, &tp->t_canq);
694 } else if (tp->t_rocount++ == 0)
695 tp->t_rocol = tp->t_column;
696 if (ISSET(tp->t_state, TS_ERASE)) {
698 * end of prterase \.../
700 CLR(tp->t_state, TS_ERASE);
701 (void)ttyoutput('/', tp);
705 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
707 * Place the cursor over the '^' of the ^D.
709 i = imin(2, tp->t_column - i);
711 (void)ttyoutput('\b', tp);
718 * IXANY means allow any character to restart output.
720 if (ISSET(tp->t_state, TS_TTSTOP) &&
721 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) {
722 lwkt_reltoken(&tty_token);
726 CLR(tp->t_lflag, FLUSHO);
727 CLR(tp->t_state, TS_TTSTOP);
729 lwkt_reltoken(&tty_token);
730 return (ttstart(tp));
734 * Output a single character on a tty, doing output processing
735 * as needed (expanding tabs, newline processing, etc.).
736 * Returns < 0 if succeeds, otherwise returns char to resend.
740 ttyoutput(int c, struct tty *tp)
745 lwkt_gettoken(&tty_token);
747 if (!ISSET(oflag, OPOST)) {
748 if (ISSET(tp->t_lflag, FLUSHO)) {
749 lwkt_reltoken(&tty_token);
752 if (clist_putc(c, &tp->t_outq)) {
753 lwkt_reltoken(&tty_token);
758 lwkt_reltoken(&tty_token);
762 * Do tab expansion if OXTABS is set. Special case if we external
763 * processing, we don't do the tab expansion because we'll probably
764 * get it wrong. If tab expansion needs to be done, let it happen
767 CLR(c, ~TTY_CHARMASK);
769 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
770 c = 8 - (tp->t_column & 7);
771 if (!ISSET(tp->t_lflag, FLUSHO)) {
772 crit_enter(); /* Don't interrupt tabs. */
773 c -= b_to_q(" ", c, &tp->t_outq);
779 lwkt_reltoken(&tty_token);
780 return (c ? -1 : '\t');
782 if (c == CEOT && ISSET(oflag, ONOEOT)) {
783 lwkt_reltoken(&tty_token);
788 * Newline translation: if ONLCR is set,
789 * translate newline into "\r\n".
791 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
794 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq)) {
795 lwkt_reltoken(&tty_token);
799 /* If OCRNL is set, translate "\r" into "\n". */
800 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
802 /* If ONOCR is set, don't transmit CRs when on column 0. */
803 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) {
804 lwkt_reltoken(&tty_token);
810 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq)) {
811 lwkt_reltoken(&tty_token);
824 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
834 col = (col + 8) & ~7;
838 lwkt_reltoken(&tty_token);
843 * Ioctls for all tty devices. Called after line-discipline specific ioctl
844 * has been called to do discipline-specific functions and/or reject any
845 * of these ioctl commands.
849 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
851 struct thread *td = curthread;
852 struct lwp *lp = td->td_lwp;
853 struct proc *p = td->td_proc;
859 lwkt_gettoken(&tty_token);
860 lwkt_gettoken(&proc_token);
861 lwkt_gettoken(&p->p_token);
863 /* If the ioctl involves modification, hang if in the background. */
887 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
897 while (isbackground(p, tp) && !(p->p_flags & P_PPWAIT) &&
898 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
899 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
900 if (p->p_pgrp->pg_jobc == 0) {
901 lwkt_reltoken(&p->p_token);
902 lwkt_reltoken(&proc_token);
903 lwkt_reltoken(&tty_token);
906 pgsignal(p->p_pgrp, SIGTTOU, 1);
907 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
910 lwkt_reltoken(&p->p_token);
911 lwkt_reltoken(&proc_token);
912 lwkt_reltoken(&tty_token);
919 switch (cmd) { /* Process the ioctl. */
920 case FIOASYNC: /* set/clear async i/o */
923 SET(tp->t_state, TS_ASYNC);
925 CLR(tp->t_state, TS_ASYNC);
928 case FIONREAD: /* get # bytes to read */
930 *(int *)data = ttnread(tp);
936 * Policy -- Don't allow FIOSETOWN on someone else's
939 if (tp->t_session != NULL && !isctty(p, tp)) {
940 lwkt_reltoken(&p->p_token);
941 lwkt_reltoken(&proc_token);
942 lwkt_reltoken(&tty_token);
946 error = fsetown(*(int *)data, &tp->t_sigio);
948 lwkt_reltoken(&p->p_token);
949 lwkt_reltoken(&proc_token);
950 lwkt_reltoken(&tty_token);
955 if (tp->t_session != NULL && !isctty(p, tp)) {
956 lwkt_reltoken(&p->p_token);
957 lwkt_reltoken(&proc_token);
958 lwkt_reltoken(&tty_token);
961 *(int *)data = fgetown(&tp->t_sigio);
964 case TIOCEXCL: /* set exclusive use of tty */
966 SET(tp->t_state, TS_XCLUDE);
969 case TIOCFLUSH: { /* flush buffers */
970 int flags = *(int *)data;
973 flags = FREAD | FWRITE;
975 flags &= FREAD | FWRITE;
979 case TIOCCONS: /* become virtual console */
981 if (constty && constty != tp &&
982 ISSET(constty->t_state, TS_CONNECTED)) {
983 lwkt_reltoken(&p->p_token);
984 lwkt_reltoken(&proc_token);
985 lwkt_reltoken(&tty_token);
989 if ((error = priv_check(td, PRIV_ROOT)) != 0) {
990 lwkt_reltoken(&p->p_token);
991 lwkt_reltoken(&proc_token);
992 lwkt_reltoken(&tty_token);
997 } else if (tp == constty)
1000 case TIOCDRAIN: /* wait till output drained */
1001 error = ttywait(tp);
1003 lwkt_reltoken(&p->p_token);
1004 lwkt_reltoken(&proc_token);
1005 lwkt_reltoken(&tty_token);
1009 case TIOCGETA: { /* get termios struct */
1010 struct termios *t = (struct termios *)data;
1012 bcopy(&tp->t_termios, t, sizeof(struct termios));
1015 case TIOCGETD: /* get line discipline */
1016 *(int *)data = tp->t_line;
1018 case TIOCGWINSZ: /* get window size */
1019 *(struct winsize *)data = tp->t_winsize;
1021 case TIOCGPGRP: /* get pgrp of tty */
1022 if (!isctty(p, tp)) {
1023 lwkt_reltoken(&p->p_token);
1024 lwkt_reltoken(&proc_token);
1025 lwkt_reltoken(&tty_token);
1028 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
1030 case TIOCGSID: /* get sid of tty */
1031 if (!isctty(p, tp)) {
1032 lwkt_reltoken(&p->p_token);
1033 lwkt_reltoken(&proc_token);
1034 lwkt_reltoken(&tty_token);
1037 *(int *)data = tp->t_session->s_sid;
1040 case TIOCHPCL: /* hang up on last close */
1042 SET(tp->t_cflag, HUPCL);
1046 case TIOCNXCL: /* reset exclusive use of tty */
1048 CLR(tp->t_state, TS_XCLUDE);
1051 case TIOCOUTQ: /* output queue size */
1052 *(int *)data = tp->t_outq.c_cc;
1054 case TIOCSETA: /* set termios struct */
1055 case TIOCSETAW: /* drain output, set */
1056 case TIOCSETAF: { /* drn out, fls in, set */
1057 struct termios *t = (struct termios *)data;
1059 if (t->c_ispeed == 0)
1060 t->c_ispeed = t->c_ospeed;
1061 if (t->c_ispeed == 0)
1062 t->c_ispeed = tp->t_ospeed;
1063 if (t->c_ispeed == 0) {
1064 lwkt_reltoken(&p->p_token);
1065 lwkt_reltoken(&proc_token);
1066 lwkt_reltoken(&tty_token);
1070 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1071 error = ttywait(tp);
1074 lwkt_reltoken(&p->p_token);
1075 lwkt_reltoken(&proc_token);
1076 lwkt_reltoken(&tty_token);
1079 if (cmd == TIOCSETAF)
1080 ttyflush(tp, FREAD);
1082 if (!ISSET(t->c_cflag, CIGNORE)) {
1084 * Set device hardware.
1086 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
1088 lwkt_reltoken(&p->p_token);
1089 lwkt_reltoken(&proc_token);
1090 lwkt_reltoken(&tty_token);
1093 if (ISSET(t->c_cflag, CLOCAL) &&
1094 !ISSET(tp->t_cflag, CLOCAL)) {
1096 * XXX disconnections would be too hard to
1097 * get rid of without this kludge. The only
1098 * way to get rid of controlling terminals
1099 * is to exit from the session leader.
1101 CLR(tp->t_state, TS_ZOMBIE);
1103 wakeup(TSA_CARR_ON(tp));
1107 if ((ISSET(tp->t_state, TS_CARR_ON) ||
1108 ISSET(t->c_cflag, CLOCAL)) &&
1109 !ISSET(tp->t_state, TS_ZOMBIE))
1110 SET(tp->t_state, TS_CONNECTED);
1112 CLR(tp->t_state, TS_CONNECTED);
1113 tp->t_cflag = t->c_cflag;
1114 tp->t_ispeed = t->c_ispeed;
1115 if (t->c_ospeed != 0)
1116 tp->t_ospeed = t->c_ospeed;
1119 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1121 if (ISSET(t->c_lflag, ICANON))
1122 SET(tp->t_lflag, PENDIN);
1125 * XXX we really shouldn't allow toggling
1126 * ICANON while we're in a non-termios line
1127 * discipline. Now we have to worry about
1128 * panicing for a null queue.
1130 if (tp->t_canq.c_cbreserved > 0 &&
1131 tp->t_rawq.c_cbreserved > 0) {
1132 catq(&tp->t_rawq, &tp->t_canq);
1134 * XXX the queue limits may be
1135 * different, so the old queue
1136 * swapping method no longer works.
1138 catq(&tp->t_canq, &tp->t_rawq);
1140 CLR(tp->t_lflag, PENDIN);
1144 tp->t_iflag = t->c_iflag;
1145 tp->t_oflag = t->c_oflag;
1147 * Make the EXTPROC bit read only.
1149 if (ISSET(tp->t_lflag, EXTPROC))
1150 SET(t->c_lflag, EXTPROC);
1152 CLR(t->c_lflag, EXTPROC);
1153 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1154 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1155 t->c_cc[VTIME] != tp->t_cc[VTIME])
1157 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1161 case TIOCSETD: { /* set line discipline */
1162 int t = *(int *)data;
1163 cdev_t device = tp->t_dev;
1165 if ((u_int)t >= nlinesw) {
1166 lwkt_reltoken(&p->p_token);
1167 lwkt_reltoken(&proc_token);
1168 lwkt_reltoken(&tty_token);
1171 if (t != tp->t_line) {
1173 (*linesw[tp->t_line].l_close)(tp, flag);
1174 error = (*linesw[t].l_open)(device, tp);
1176 (void)(*linesw[tp->t_line].l_open)(device, tp);
1178 lwkt_reltoken(&p->p_token);
1179 lwkt_reltoken(&proc_token);
1180 lwkt_reltoken(&tty_token);
1188 case TIOCSTART: /* start output, like ^Q */
1190 if (ISSET(tp->t_state, TS_TTSTOP) ||
1191 ISSET(tp->t_lflag, FLUSHO)) {
1192 CLR(tp->t_lflag, FLUSHO);
1193 CLR(tp->t_state, TS_TTSTOP);
1198 case TIOCSTI: /* simulate terminal input */
1199 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT)) {
1200 lwkt_reltoken(&p->p_token);
1201 lwkt_reltoken(&proc_token);
1202 lwkt_reltoken(&tty_token);
1205 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT)) {
1206 lwkt_reltoken(&p->p_token);
1207 lwkt_reltoken(&proc_token);
1208 lwkt_reltoken(&tty_token);
1212 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1215 case TIOCSTOP: /* stop output, like ^S */
1217 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1218 SET(tp->t_state, TS_TTSTOP);
1219 (*tp->t_stop)(tp, 0);
1223 case TIOCSCTTY: /* become controlling tty */
1224 /* Session ctty vnode pointer set in vnode layer. */
1225 if (!SESS_LEADER(p) ||
1226 ((p->p_session->s_ttyvp || tp->t_session) &&
1227 (tp->t_session != p->p_session))) {
1228 lwkt_reltoken(&p->p_token);
1229 lwkt_reltoken(&proc_token);
1230 lwkt_reltoken(&tty_token);
1234 tp->t_session = p->p_session;
1237 tp->t_pgrp = p->p_pgrp;
1238 otp = p->p_session->s_ttyp;
1239 p->p_session->s_ttyp = tp;
1240 p->p_flags |= P_CONTROLT;
1248 case TIOCSPGRP: { /* set pgrp of tty */
1249 pid_t pgid = *(int *)data;
1251 if (!isctty(p, tp)) {
1252 lwkt_reltoken(&p->p_token);
1253 lwkt_reltoken(&proc_token);
1254 lwkt_reltoken(&tty_token);
1257 else if (pgid < 1 || pgid > PID_MAX) {
1258 lwkt_reltoken(&p->p_token);
1259 lwkt_reltoken(&proc_token);
1260 lwkt_reltoken(&tty_token);
1263 struct pgrp *pgrp = pgfind(pgid);
1264 if (pgrp == NULL || pgrp->pg_session != p->p_session) {
1267 lwkt_reltoken(&p->p_token);
1268 lwkt_reltoken(&proc_token);
1269 lwkt_reltoken(&tty_token);
1281 case TIOCSTAT: /* simulate control-T */
1286 case TIOCSWINSZ: /* set window size */
1287 if (bcmp((caddr_t)&tp->t_winsize, data,
1288 sizeof (struct winsize))) {
1289 tp->t_winsize = *(struct winsize *)data;
1290 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1293 case TIOCSDRAINWAIT:
1294 error = priv_check(td, PRIV_ROOT);
1296 lwkt_reltoken(&p->p_token);
1297 lwkt_reltoken(&proc_token);
1298 lwkt_reltoken(&tty_token);
1301 tp->t_timeout = *(int *)data * hz;
1302 wakeup(TSA_OCOMPLETE(tp));
1303 wakeup(TSA_OLOWAT(tp));
1305 case TIOCGDRAINWAIT:
1306 *(int *)data = tp->t_timeout / hz;
1309 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1310 lwkt_reltoken(&p->p_token);
1311 lwkt_reltoken(&proc_token);
1312 lwkt_reltoken(&tty_token);
1313 return (ttcompat(tp, cmd, data, flag));
1315 lwkt_reltoken(&p->p_token);
1316 lwkt_reltoken(&proc_token);
1317 lwkt_reltoken(&tty_token);
1321 lwkt_reltoken(&p->p_token);
1322 lwkt_reltoken(&proc_token);
1323 lwkt_reltoken(&tty_token);
1327 static struct filterops ttyread_filtops =
1328 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ttyrdetach, filt_ttyread };
1329 static struct filterops ttywrite_filtops =
1330 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ttywdetach, filt_ttywrite };
1333 ttykqfilter(struct dev_kqfilter_args *ap)
1335 cdev_t dev = ap->a_head.a_dev;
1336 struct knote *kn = ap->a_kn;
1337 struct tty *tp = dev->si_tty;
1338 struct klist *klist;
1342 lwkt_gettoken(&tty_token);
1343 switch (kn->kn_filter) {
1345 klist = &tp->t_rkq.ki_note;
1346 kn->kn_fop = &ttyread_filtops;
1349 klist = &tp->t_wkq.ki_note;
1350 kn->kn_fop = &ttywrite_filtops;
1353 ap->a_result = EOPNOTSUPP;
1354 lwkt_reltoken(&tty_token);
1357 lwkt_reltoken(&tty_token);
1358 kn->kn_hook = (caddr_t)dev;
1359 knote_insert(klist, kn);
1365 filt_ttyrdetach(struct knote *kn)
1367 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1369 lwkt_gettoken(&tty_token);
1370 knote_remove(&tp->t_rkq.ki_note, kn);
1371 lwkt_reltoken(&tty_token);
1375 filt_ttyread(struct knote *kn, long hint)
1377 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1379 lwkt_gettoken(&tty_token);
1380 kn->kn_data = ttnread(tp);
1381 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1382 kn->kn_flags |= (EV_EOF | EV_NODATA);
1383 lwkt_reltoken(&tty_token);
1386 lwkt_reltoken(&tty_token);
1387 return (kn->kn_data > 0);
1391 filt_ttywdetach(struct knote *kn)
1393 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1395 lwkt_gettoken(&tty_token);
1396 knote_remove(&tp->t_wkq.ki_note, kn);
1397 lwkt_reltoken(&tty_token);
1401 filt_ttywrite(struct knote *kn, long hint)
1403 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1406 lwkt_gettoken(&tty_token);
1407 kn->kn_data = tp->t_outq.c_cc;
1408 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1409 lwkt_reltoken(&tty_token);
1412 ret = (kn->kn_data <= tp->t_olowat &&
1413 ISSET(tp->t_state, TS_CONNECTED));
1414 lwkt_reltoken(&tty_token);
1419 * Must be called while in a critical section.
1420 * NOTE: tty_token must be held.
1423 ttnread(struct tty *tp)
1427 ASSERT_LWKT_TOKEN_HELD(&tty_token);
1428 if (ISSET(tp->t_lflag, PENDIN))
1430 nread = tp->t_canq.c_cc;
1431 if (!ISSET(tp->t_lflag, ICANON)) {
1432 nread += tp->t_rawq.c_cc;
1433 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1440 * Wait for output to drain.
1443 ttywait(struct tty *tp)
1449 lwkt_gettoken(&tty_token);
1450 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1451 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1453 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1454 ISSET(tp->t_state, TS_CONNECTED)) {
1455 SET(tp->t_state, TS_SO_OCOMPLETE);
1456 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1460 if (error == EWOULDBLOCK)
1467 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1469 lwkt_reltoken(&tty_token);
1475 * Flush if successfully wait.
1478 ttywflush(struct tty *tp)
1482 if ((error = ttywait(tp)) == 0)
1483 ttyflush(tp, FREAD);
1488 * Flush tty read and/or write queues, notifying anyone waiting.
1491 ttyflush(struct tty *tp, int rw)
1494 lwkt_gettoken(&tty_token);
1499 FLUSHQ(&tp->t_outq);
1500 CLR(tp->t_state, TS_TTSTOP);
1502 (*tp->t_stop)(tp, rw);
1504 FLUSHQ(&tp->t_canq);
1505 FLUSHQ(&tp->t_rawq);
1506 CLR(tp->t_lflag, PENDIN);
1509 CLR(tp->t_state, TS_LOCAL);
1511 if (ISSET(tp->t_state, TS_TBLOCK)) {
1513 FLUSHQ(&tp->t_outq);
1517 * Don't let leave any state that might clobber the
1518 * next line discipline (although we should do more
1519 * to send the START char). Not clearing the state
1520 * may have caused the "putc to a clist with no
1521 * reserved cblocks" panic/kprintf.
1523 CLR(tp->t_state, TS_TBLOCK);
1525 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1526 if (ISSET(tp->t_iflag, IXOFF)) {
1528 * XXX wait a bit in the hope that the stop
1529 * character (if any) will go out. Waiting
1530 * isn't good since it allows races. This
1531 * will be fixed when the stop character is
1532 * put in a special queue. Don't bother with
1533 * the checks in ttywait() since the timeout
1536 SET(tp->t_state, TS_SO_OCOMPLETE);
1537 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1540 * Don't try sending the stop character again.
1542 CLR(tp->t_state, TS_TBLOCK);
1549 FLUSHQ(&tp->t_outq);
1552 lwkt_reltoken(&tty_token);
1557 * Copy in the default termios characters.
1560 termioschars(struct termios *t)
1562 lwkt_gettoken(&tty_token);
1563 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1564 lwkt_reltoken(&tty_token);
1571 ttychars(struct tty *tp)
1573 lwkt_gettoken(&tty_token);
1574 termioschars(&tp->t_termios);
1575 lwkt_reltoken(&tty_token);
1579 * Handle input high water. Send stop character for the IXOFF case. Turn
1580 * on our input flow control bit and propagate the changes to the driver.
1581 * XXX the stop character should be put in a special high priority queue.
1584 ttyblock(struct tty *tp)
1586 lwkt_gettoken(&tty_token);
1587 SET(tp->t_state, TS_TBLOCK);
1588 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1589 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1590 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1592 lwkt_reltoken(&tty_token);
1596 * Handle input low water. Send start character for the IXOFF case. Turn
1597 * off our input flow control bit and propagate the changes to the driver.
1598 * XXX the start character should be put in a special high priority queue.
1601 ttyunblock(struct tty *tp)
1603 lwkt_gettoken(&tty_token);
1604 CLR(tp->t_state, TS_TBLOCK);
1605 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1606 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1607 SET(tp->t_state, TS_TBLOCK); /* try again later */
1609 lwkt_reltoken(&tty_token);
1613 /* Not used by any current (i386) drivers. */
1615 * Restart after an inter-char delay.
1618 ttrstrt(void *tp_arg)
1622 KASSERT(tp_arg != NULL, ("ttrstrt"));
1626 lwkt_gettoken(&tty_token);
1627 CLR(tp->t_state, TS_TIMEOUT);
1629 lwkt_reltoken(&tty_token);
1635 ttstart(struct tty *tp)
1637 lwkt_gettoken(&tty_token);
1638 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1640 lwkt_reltoken(&tty_token);
1645 * "close" a line discipline
1648 ttylclose(struct tty *tp, int flag)
1650 lwkt_gettoken(&tty_token);
1651 if (flag & FNONBLOCK || ttywflush(tp))
1652 ttyflush(tp, FREAD | FWRITE);
1653 lwkt_reltoken(&tty_token);
1658 ttyhold(struct tty *tp)
1664 ttyunhold(struct tty *tp)
1673 * Handle modem control transition on a tty.
1674 * Flag indicates new state of carrier.
1675 * Returns 0 if the line should be turned off, otherwise 1.
1678 ttymodem(struct tty *tp, int flag)
1680 lwkt_gettoken(&tty_token);
1681 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1683 * MDMBUF: do flow control according to carrier flag
1684 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1685 * works if IXON and IXANY are clear.
1688 CLR(tp->t_state, TS_CAR_OFLOW);
1689 CLR(tp->t_state, TS_TTSTOP);
1691 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1692 SET(tp->t_state, TS_CAR_OFLOW);
1693 SET(tp->t_state, TS_TTSTOP);
1694 (*tp->t_stop)(tp, 0);
1696 } else if (flag == 0) {
1700 CLR(tp->t_state, TS_CARR_ON);
1701 if (ISSET(tp->t_state, TS_ISOPEN) &&
1702 !ISSET(tp->t_cflag, CLOCAL)) {
1703 SET(tp->t_state, TS_ZOMBIE);
1704 CLR(tp->t_state, TS_CONNECTED);
1705 if (tp->t_session && tp->t_session->s_leader)
1706 ksignal(tp->t_session->s_leader, SIGHUP);
1707 ttyflush(tp, FREAD | FWRITE);
1708 lwkt_reltoken(&tty_token);
1715 SET(tp->t_state, TS_CARR_ON);
1716 if (!ISSET(tp->t_state, TS_ZOMBIE))
1717 SET(tp->t_state, TS_CONNECTED);
1718 wakeup(TSA_CARR_ON(tp));
1722 lwkt_reltoken(&tty_token);
1727 * Reinput pending characters after state switch
1728 * call from a critical section.
1731 ttypend(struct tty *tp)
1736 lwkt_gettoken(&tty_token);
1737 CLR(tp->t_lflag, PENDIN);
1738 SET(tp->t_state, TS_TYPEN);
1740 * XXX this assumes too much about clist internals. It may even
1741 * fail if the cblock slush pool is empty. We can't allocate more
1742 * cblocks here because we are called from an interrupt handler
1743 * and clist_alloc_cblocks() can wait.
1746 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1747 tp->t_rawq.c_cbmax = tq.c_cbmax;
1748 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1749 while ((c = clist_getc(&tq)) >= 0)
1751 CLR(tp->t_state, TS_TYPEN);
1752 lwkt_reltoken(&tty_token);
1756 * Process a read call on a tty device.
1759 ttread(struct tty *tp, struct uio *uio, int flag)
1764 cc_t *cc = tp->t_cc;
1767 int first, error = 0;
1768 int has_stime = 0, last_cc = 0;
1769 long slp = 0; /* XXX this should be renamed `timo'. */
1770 struct timeval stime;
1772 lp = curthread->td_lwp;
1773 stime.tv_sec = 0; /* fix compiler warnings */
1776 lwkt_gettoken(&tty_token);
1779 lflag = tp->t_lflag;
1781 * take pending input first
1783 if (ISSET(lflag, PENDIN)) {
1785 splz(); /* reduce latency */
1786 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1790 * Hang process if it's in the background.
1792 lwkt_gettoken(&proc_token);
1793 if ((pp = curproc) && isbackground(pp, tp)) {
1795 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1796 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1797 (pp->p_flags & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) {
1798 lwkt_reltoken(&proc_token);
1799 lwkt_reltoken(&tty_token);
1802 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1803 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1805 lwkt_reltoken(&proc_token);
1806 lwkt_reltoken(&tty_token);
1809 lwkt_reltoken(&proc_token);
1812 lwkt_reltoken(&proc_token);
1814 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1816 lwkt_reltoken(&tty_token);
1817 return (0); /* EOF */
1821 * If canonical, use the canonical queue,
1822 * else use the raw queue.
1824 * (should get rid of clists...)
1826 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1828 if (flag & IO_NDELAY) {
1831 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1833 lwkt_reltoken(&tty_token);
1837 lwkt_reltoken(&tty_token);
1838 return (EWOULDBLOCK);
1840 if (!ISSET(lflag, ICANON)) {
1843 struct timeval timecopy;
1846 * Check each of the four combinations.
1847 * (m > 0 && t == 0) is the normal read case.
1848 * It should be fairly efficient, so we check that and its
1849 * companion case (m == 0 && t == 0) first.
1850 * For the other two cases, we compute the target sleep time
1859 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1861 lwkt_reltoken(&tty_token);
1864 t *= 100000; /* time in us */
1865 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1866 ((t1).tv_usec - (t2).tv_usec))
1872 getmicrotime(&timecopy);
1873 if (has_stime == 0) {
1874 /* first character, start timer */
1878 } else if (qp->c_cc > last_cc) {
1879 /* got a character, restart timer */
1883 /* nothing, check expiration */
1884 slp = t - diff(timecopy, stime);
1889 } else { /* m == 0 */
1892 getmicrotime(&timecopy);
1893 if (has_stime == 0) {
1898 slp = t - diff(timecopy, stime);
1900 /* Timed out, but 0 is enough input. */
1902 lwkt_reltoken(&tty_token);
1909 * Rounding down may make us wake up just short
1910 * of the target, so we round up.
1911 * The formula is ceiling(slp * hz/1000000).
1912 * 32-bit arithmetic is enough for hz < 169.
1913 * XXX see tvtohz() for how to avoid overflow if hz
1914 * is large (divide by `tick' and/or arrange to
1915 * use tvtohz() if hz is large).
1917 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1920 if (qp->c_cc <= 0) {
1923 * There is no input, or not enough input and we can block.
1925 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1926 ISSET(tp->t_state, TS_CONNECTED) ?
1927 "ttyin" : "ttyhup", (int)slp);
1929 if (error == EWOULDBLOCK)
1932 lwkt_reltoken(&tty_token);
1936 * XXX what happens if another process eats some input
1937 * while we are asleep (not just here)? It would be
1938 * safest to detect changes and reset our state variables
1939 * (has_stime and last_cc).
1947 * Input present, check for input mapping and processing.
1950 if (ISSET(lflag, ICANON | ISIG))
1956 icc = (int)szmin(uio->uio_resid, IBUFSIZ);
1957 icc = q_to_b(qp, ibuf, icc);
1963 error = uiomove(ibuf, (size_t)icc, uio);
1965 * XXX if there was an error then we should ungetc() the
1966 * unmoved chars and reduce icc here.
1970 if (uio->uio_resid == 0)
1984 * delayed suspend (^Y)
1986 if (CCEQ(cc[VDSUSP], c) &&
1987 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1988 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1990 error = ttysleep(tp, &lbolt, PCATCH,
1999 * Interpret EOF only in canonical mode.
2001 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
2004 * Give user character.
2006 error = ureadc(c, uio);
2008 /* XXX should ungetc(c, qp). */
2010 if (uio->uio_resid == 0)
2013 * In canonical mode check for a "break character"
2014 * marking the end of a "line of input".
2016 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
2023 * Look to unblock input now that (presumably)
2024 * the input queue has gone down.
2027 if (ISSET(tp->t_state, TS_TBLOCK) &&
2028 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
2032 lwkt_reltoken(&tty_token);
2037 * Check the output queue on tp for space for a kernel message (from uprintf
2038 * or tprintf). Allow some space over the normal hiwater mark so we don't
2039 * lose messages due to normal flow control, but don't let the tty run amok.
2040 * Sleeps here are not interruptible, but we return prematurely if new signals
2044 ttycheckoutq(struct tty *tp, int wait)
2046 struct lwp *lp = curthread->td_lwp;
2048 sigset_t oldset, newset;
2050 lwkt_gettoken(&tty_token);
2051 hiwat = tp->t_ohiwat;
2052 SIGEMPTYSET(oldset);
2053 SIGEMPTYSET(newset);
2056 oldset = lwp_sigpend(lp);
2057 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
2058 while (tp->t_outq.c_cc > hiwat) {
2060 if (tp->t_outq.c_cc <= hiwat)
2063 newset = lwp_sigpend(lp);
2064 if (!wait || SIGSETNEQ(oldset, newset)) {
2066 lwkt_reltoken(&tty_token);
2069 SET(tp->t_state, TS_SO_OLOWAT);
2070 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
2074 lwkt_reltoken(&tty_token);
2079 * Process a write call on a tty device.
2082 ttwrite(struct tty *tp, struct uio *uio, int flag)
2088 int i, hiwat, error;
2093 lwkt_gettoken(&tty_token);
2094 lp = curthread->td_lwp;
2095 hiwat = tp->t_ohiwat;
2096 cnt = uio->uio_resid;
2101 if (ISSET(tp->t_state, TS_ZOMBIE)) {
2103 if (uio->uio_resid == cnt)
2107 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2108 if (flag & IO_NDELAY) {
2110 error = EWOULDBLOCK;
2113 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
2122 * Hang the process if it's in the background.
2124 lwkt_gettoken(&proc_token);
2125 if ((pp = curproc) && isbackground(pp, tp) &&
2126 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flags & P_PPWAIT) &&
2127 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
2128 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
2129 if (pp->p_pgrp->pg_jobc == 0) {
2131 lwkt_reltoken(&proc_token);
2134 pgsignal(pp->p_pgrp, SIGTTOU, 1);
2135 lwkt_reltoken(&proc_token);
2136 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
2141 lwkt_reltoken(&proc_token);
2143 * Process the user's data in at most OBUFSIZ chunks. Perform any
2144 * output translation. Keep track of high water mark, sleep on
2145 * overflow awaiting device aid in acquiring new space.
2147 while (uio->uio_resid > 0 || cc > 0) {
2148 if (ISSET(tp->t_lflag, FLUSHO)) {
2150 lwkt_reltoken(&tty_token);
2153 if (tp->t_outq.c_cc > hiwat)
2156 * Grab a hunk of data from the user, unless we have some
2157 * leftover from last time.
2160 cc = szmin(uio->uio_resid, OBUFSIZ);
2162 error = uiomove(cp, (size_t)cc, uio);
2169 * If nothing fancy need be done, grab those characters we
2170 * can handle without any of ttyoutput's processing and
2171 * just transfer them to the output q. For those chars
2172 * which require special processing (as indicated by the
2173 * bits in char_type), call ttyoutput. After processing
2174 * a hunk of data, look for FLUSHO so ^O's will take effect
2178 if (!ISSET(tp->t_oflag, OPOST))
2181 ce = cc - scanc((u_int)cc, (u_char *)cp,
2182 char_type, CCLASSMASK);
2184 * If ce is zero, then we're processing
2185 * a special character through ttyoutput.
2189 if (ttyoutput(*cp, tp) >= 0) {
2190 /* No Clists, wait a bit. */
2192 if (flag & IO_NDELAY) {
2193 error = EWOULDBLOCK;
2196 error = ttysleep(tp, &lbolt,
2205 if (ISSET(tp->t_lflag, FLUSHO) ||
2206 tp->t_outq.c_cc > hiwat)
2212 * A bunch of normal characters have been found.
2213 * Transfer them en masse to the output queue and
2214 * continue processing at the top of the loop.
2215 * If there are any further characters in this
2216 * <= OBUFSIZ chunk, the first should be a character
2217 * requiring special handling by ttyoutput.
2220 i = b_to_q(cp, ce, &tp->t_outq);
2223 cp += ce, cc -= ce, tk_nout += ce;
2226 /* No Clists, wait a bit. */
2228 if (flag & IO_NDELAY) {
2229 error = EWOULDBLOCK;
2232 error = ttysleep(tp, &lbolt, PCATCH,
2238 if (ISSET(tp->t_lflag, FLUSHO) ||
2239 tp->t_outq.c_cc > hiwat)
2246 * If cc is nonzero, we leave the uio structure inconsistent, as the
2247 * offset and iov pointers have moved forward, but it doesn't matter
2248 * (the call will either return short or restart with a new uio).
2250 uio->uio_resid += cc;
2251 lwkt_reltoken(&tty_token);
2258 * This can only occur if FLUSHO is set in t_lflag,
2259 * or if ttstart/oproc is synchronous (or very fast).
2261 if (tp->t_outq.c_cc <= hiwat) {
2265 if (flag & IO_NDELAY) {
2267 uio->uio_resid += cc;
2268 lwkt_reltoken(&tty_token);
2269 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2271 SET(tp->t_state, TS_SO_OLOWAT);
2272 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2274 if (error == EWOULDBLOCK)
2282 * Rubout one character from the rawq of tp
2283 * as cleanly as possible.
2284 * NOTE: Must be called with tty_token held
2287 ttyrub(int c, struct tty *tp)
2293 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2294 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2296 CLR(tp->t_lflag, FLUSHO);
2297 if (ISSET(tp->t_lflag, ECHOE)) {
2298 if (tp->t_rocount == 0) {
2300 * Screwed by ttwrite; retype
2305 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2308 CLR(c, ~TTY_CHARMASK);
2309 switch (CCLASS(c)) {
2318 if (ISSET(tp->t_lflag, ECHOCTL))
2322 if (tp->t_rocount < tp->t_rawq.c_cc) {
2327 savecol = tp->t_column;
2328 SET(tp->t_state, TS_CNTTB);
2329 SET(tp->t_lflag, FLUSHO);
2330 tp->t_column = tp->t_rocol;
2331 cp = tp->t_rawq.c_cf;
2333 tabc = *cp; /* XXX FIX NEXTC */
2334 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2336 CLR(tp->t_lflag, FLUSHO);
2337 CLR(tp->t_state, TS_CNTTB);
2340 /* savecol will now be length of the tab. */
2341 savecol -= tp->t_column;
2342 tp->t_column += savecol;
2344 savecol = 8; /* overflow screw */
2345 while (--savecol >= 0)
2346 (void)ttyoutput('\b', tp);
2349 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2350 (void)kprintf(PANICSTR, c, CCLASS(c));
2352 panic(PANICSTR, c, CCLASS(c));
2356 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2357 if (!ISSET(tp->t_state, TS_ERASE)) {
2358 SET(tp->t_state, TS_ERASE);
2359 (void)ttyoutput('\\', tp);
2363 ttyecho(tp->t_cc[VERASE], tp);
2365 * This code may be executed not only when an ERASE key
2366 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2367 * So, I didn't think it was worthwhile to pass the extra
2368 * information (which would need an extra parameter,
2369 * changing every call) needed to distinguish the ERASE2
2370 * case from the ERASE.
2377 * Back over cnt characters, erasing them.
2378 * NOTE: Must be called with tty_token held
2381 ttyrubo(struct tty *tp, int cnt)
2383 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2385 (void)ttyoutput('\b', tp);
2386 (void)ttyoutput(' ', tp);
2387 (void)ttyoutput('\b', tp);
2393 * Reprint the rawq line. Note, it is assumed that c_cc has already
2395 * NOTE: Must be called with tty_token held
2398 ttyretype(struct tty *tp)
2403 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2404 /* Echo the reprint character. */
2405 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2406 ttyecho(tp->t_cc[VREPRINT], tp);
2408 (void)ttyoutput('\n', tp);
2412 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2413 * BIT OF FIRST CHAR.
2416 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2417 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2419 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2420 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2422 CLR(tp->t_state, TS_ERASE);
2425 tp->t_rocount = tp->t_rawq.c_cc;
2430 * Echo a typed character to the terminal.
2431 * NOTE: Must be called with tty_token held
2434 ttyecho(int c, struct tty *tp)
2436 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2438 if (!ISSET(tp->t_state, TS_CNTTB))
2439 CLR(tp->t_lflag, FLUSHO);
2440 if ((!ISSET(tp->t_lflag, ECHO) &&
2441 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2442 ISSET(tp->t_lflag, EXTPROC))
2444 if (ISSET(tp->t_lflag, ECHOCTL) &&
2445 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2446 ISSET(c, TTY_CHARMASK) == 0177)) {
2447 (void)ttyoutput('^', tp);
2448 CLR(c, ~TTY_CHARMASK);
2454 (void)ttyoutput(c, tp);
2458 * Wake up any readers on a tty.
2461 ttwakeup(struct tty *tp)
2463 lwkt_gettoken(&tty_token);
2464 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2465 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2466 wakeup(TSA_HUP_OR_INPUT(tp));
2467 KNOTE(&tp->t_rkq.ki_note, 0);
2468 lwkt_reltoken(&tty_token);
2472 * Wake up any writers on a tty.
2475 ttwwakeup(struct tty *tp)
2477 lwkt_gettoken(&tty_token);
2478 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2479 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2480 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2481 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2482 CLR(tp->t_state, TS_SO_OCOMPLETE);
2483 wakeup(TSA_OCOMPLETE(tp));
2485 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2486 tp->t_outq.c_cc <= tp->t_olowat) {
2487 CLR(tp->t_state, TS_SO_OLOWAT);
2488 wakeup(TSA_OLOWAT(tp));
2490 KNOTE(&tp->t_wkq.ki_note, 0);
2491 lwkt_reltoken(&tty_token);
2495 * Look up a code for a specified speed in a conversion table;
2496 * used by drivers to map software speed values to hardware parameters.
2500 ttspeedtab(int speed, struct speedtab *table)
2503 for ( ; table->sp_speed != -1; table++)
2504 if (table->sp_speed == speed)
2505 return (table->sp_code);
2510 * Set input and output watermarks and buffer sizes. For input, the
2511 * high watermark is about one second's worth of input above empty, the
2512 * low watermark is slightly below high water, and the buffer size is a
2513 * driver-dependent amount above high water. For output, the watermarks
2514 * are near the ends of the buffer, with about 1 second's worth of input
2515 * between them. All this only applies to the standard line discipline.
2518 ttsetwater(struct tty *tp)
2520 int cps, ttmaxhiwat, x;
2522 lwkt_gettoken(&tty_token);
2524 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2525 switch (tp->t_ispeedwat) {
2527 cps = tp->t_ispeed / 10;
2531 * This case is for old drivers that don't know about
2532 * t_ispeedwat. Arrange for them to get the old buffer
2533 * sizes and watermarks.
2535 cps = TTYHOG - 2 * 256;
2536 tp->t_ififosize = 2 * 2048;
2539 cps = tp->t_ispeedwat / 10;
2543 tp->t_ilowat = 7 * cps / 8;
2544 x = cps + tp->t_ififosize;
2545 clist_alloc_cblocks(&tp->t_rawq, x, x);
2548 switch (tp->t_ospeedwat) {
2550 cps = tp->t_ospeed / 10;
2551 ttmaxhiwat = 2 * TTMAXHIWAT;
2554 cps = tp->t_ospeed / 10;
2555 ttmaxhiwat = TTMAXHIWAT;
2558 cps = tp->t_ospeedwat / 10;
2559 ttmaxhiwat = 8 * TTMAXHIWAT;
2562 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2563 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2565 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2566 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2567 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2569 clist_alloc_cblocks(&tp->t_outq, x, x);
2571 lwkt_reltoken(&tty_token);
2575 * Report on state of foreground process group.
2578 ttyinfo(struct tty *tp)
2580 struct proc *p, *pick;
2585 if (ttycheckoutq(tp,0) == 0)
2588 lwkt_gettoken(&tty_token);
2589 lwkt_gettoken(&proc_token);
2591 * We always print the load average, then figure out what else to
2592 * print based on the state of the current process group.
2594 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2595 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2597 if (tp->t_session == NULL) {
2598 ttyprintf(tp, "not a controlling terminal\n");
2599 } else if (tp->t_pgrp == NULL) {
2600 ttyprintf(tp, "no foreground process group\n");
2601 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) {
2602 ttyprintf(tp, "empty foreground process group\n");
2605 * Pick an interesting process. Note that certain elements,
2606 * in particular the wmesg, require a critical section for
2607 * safe access (YYY and we are still not MP safe).
2609 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2618 /* XXX lwp should compare lwps */
2620 for (pick = NULL; p != NULL; p = LIST_NEXT(p, p_pglist)) {
2621 if (proc_compare(pick, p))
2626 lp = FIRST_LWP_IN_PROC(pick);
2628 ttyprintf(tp, "foreground process without lwp\n");
2631 lwkt_reltoken(&proc_token);
2632 lwkt_reltoken(&tty_token);
2637 * Figure out what wait/process-state message, and command
2641 * XXX lwp This is a horrible mixture. We need to rework this
2642 * as soon as lwps have their own runnable status.
2644 if (pick->p_flags & P_WEXIT)
2646 else if (lp->lwp_stat == LSRUN)
2648 else if (pick->p_stat == SIDL)
2650 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2651 str = lp->lwp_wmesg;
2655 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2656 pick->p_comm, pick->p_pid, str);
2659 * Calculate cpu usage, percent cpu, and cmsz. Note that
2660 * 'pick' becomes invalid the moment we exit the critical
2663 if (lp->lwp_thread && (pick->p_flags & P_SWAPPEDOUT) == 0)
2664 calcru_proc(pick, &ru);
2666 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2668 if (pick->p_stat == SIDL || pick->p_stat == SZOMB) {
2671 lwkt_gettoken(&pick->p_vmspace->vm_map.token);
2672 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2673 lwkt_reltoken(&pick->p_vmspace->vm_map.token);
2681 ttyprintf(tp, " %s ", buf);
2682 ttyprintf(tp, "%ld.%02ldu ",
2683 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2684 ttyprintf(tp, "%ld.%02lds ",
2685 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2686 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2688 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2689 lwkt_reltoken(&proc_token);
2690 lwkt_reltoken(&tty_token);
2694 * Returns 1 if p2 is "better" than p1
2696 * The algorithm for picking the "interesting" process is thus:
2698 * 1) Only foreground processes are eligible - implied.
2699 * 2) Runnable processes are favored over anything else. The runner
2700 * with the highest cpu utilization is picked (p_cpticks). Ties are
2701 * broken by picking the highest pid.
2702 * 3) The sleeper with the shortest sleep time is next. With ties,
2703 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2704 * 4) Further ties are broken by picking the highest pid.
2706 * NOTE: must be called with proc_token held.
2708 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2709 #define TESTAB(a, b) ((a)<<1 | (b))
2715 proc_compare(struct proc *p1, struct proc *p2)
2717 struct lwp *lp1, *lp2;
2719 ASSERT_LWKT_TOKEN_HELD(&proc_token);
2727 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2733 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2737 lp1 = FIRST_LWP_IN_PROC(p1);
2738 lp2 = FIRST_LWP_IN_PROC(p2);
2741 * see if at least one of them is runnable
2743 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2750 * tie - favor one with highest recent cpu utilization
2752 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2754 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2756 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2759 * pick the one with the smallest sleep time
2761 if (lp2->lwp_slptime > lp1->lwp_slptime)
2763 if (lp1->lwp_slptime > lp2->lwp_slptime)
2766 * favor one sleeping in a non-interruptible sleep
2768 if (lp1->lwp_flags & LWP_SINTR && (lp2->lwp_flags & LWP_SINTR) == 0)
2770 if (lp2->lwp_flags & LWP_SINTR && (lp1->lwp_flags & LWP_SINTR) == 0)
2772 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2776 * Output char to tty; console putchar style.
2779 tputchar(int c, struct tty *tp)
2782 lwkt_gettoken(&tty_token);
2783 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2784 lwkt_reltoken(&tty_token);
2789 (void)ttyoutput('\r', tp);
2790 (void)ttyoutput(c, tp);
2792 lwkt_reltoken(&tty_token);
2798 * Sleep on chan, returning ERESTART if tty changed while we napped and
2799 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2800 * the tty is revoked, restarting a pending call will redo validation done
2801 * at the start of the call.
2804 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2810 error = tsleep(chan, slpflags, wmesg, timo);
2813 return (tp->t_gen == gen ? 0 : ERESTART);
2819 * We bump the gen to force any ttysleep()'s to return with ERESTART
2820 * and flush the tty. The related fp's should already have been
2821 * replaced so the tty will close when the last references on the
2822 * original fp's go away.
2825 ttyrevoke(struct dev_revoke_args *ap)
2829 lwkt_gettoken(&tty_token);
2830 tp = ap->a_head.a_dev->si_tty;
2832 ttyflush(tp, FREAD | FWRITE);
2833 wakeup(TSA_CARR_ON(tp));
2836 lwkt_reltoken(&tty_token);
2841 * Allocate a tty struct. Clists in the struct will be allocated by
2845 ttymalloc(struct tty *tp)
2851 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2857 ttyunregister(struct tty *tp)
2859 lwkt_gettoken(&tty_token);
2860 KKASSERT(ISSET(tp->t_state, TS_REGISTERED));
2861 CLR(tp->t_state, TS_REGISTERED);
2862 TAILQ_REMOVE(&tty_list, tp, t_list);
2863 lwkt_reltoken(&tty_token);
2867 ttyregister(struct tty *tp)
2869 lwkt_gettoken(&tty_token);
2870 KKASSERT(!ISSET(tp->t_state, TS_REGISTERED));
2871 SET(tp->t_state, TS_REGISTERED);
2872 TAILQ_INSERT_HEAD(&tty_list, tp, t_list);
2873 lwkt_reltoken(&tty_token);
2877 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2884 bzero(&marker, sizeof(marker));
2885 marker.t_state = TS_MARKER;
2888 lwkt_gettoken(&tty_token);
2890 TAILQ_INSERT_HEAD(&tty_list, &marker, t_list);
2891 while ((tp = TAILQ_NEXT(&marker, t_list)) != NULL) {
2892 TAILQ_REMOVE(&tty_list, &marker, t_list);
2893 TAILQ_INSERT_AFTER(&tty_list, tp, &marker, t_list);
2894 if (tp->t_state & TS_MARKER)
2898 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
2899 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2903 TAILQ_REMOVE(&tty_list, &marker, t_list);
2904 lwkt_reltoken(&tty_token);
2908 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2909 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2912 nottystop(struct tty *tp, int rw)
2918 ttyread(struct dev_read_args *ap)
2923 tp = ap->a_head.a_dev->si_tty;
2926 lwkt_gettoken(&tty_token);
2927 ret = ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2928 lwkt_reltoken(&tty_token);
2934 ttywrite(struct dev_write_args *ap)
2939 tp = ap->a_head.a_dev->si_tty;
2942 lwkt_gettoken(&tty_token);
2943 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
2944 lwkt_reltoken(&tty_token);