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 * Copyright (c) 2002 Networks Associates Technologies, Inc.
11 * All rights reserved.
13 * Portions of this software were developed for the FreeBSD Project by
14 * ThinkSec AS and NAI Labs, the Security Research Division of Network
15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
16 * ("CBOSS"), as part of the DARPA CHATS research program.
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * @(#)tty.c 8.8 (Berkeley) 1/21/94
47 * o Fix races for sending the start char in ttyflush().
48 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
49 * With luck, there will be MIN chars before select() returns().
50 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
51 * o Don't allow input in TS_ZOMBIE case. It would be visible through
53 * o Do the new sio locking stuff here and use it to avoid special
56 * o Move EXTPROC and/or PENDIN to t_state?
57 * o Wrap most of ttioctl in spltty/splx.
58 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
59 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
60 * o Don't allow certain termios flags to affect disciplines other
61 * than TTYDISC. Cancel their effects before switch disciplines
62 * and ignore them if they are set while we are in another
64 * o Now that historical speed conversions are handled here, don't
66 * o Check for TS_CARR_ON being set while everything is closed and not
67 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
68 * so it would live until the next open even if carrier drops.
69 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
70 * only when _all_ openers leave open().
73 #include <sys/cdefs.h>
74 __FBSDID("$FreeBSD$");
76 #include "opt_compat.h"
79 #include <sys/param.h>
80 #include <sys/systm.h>
81 #include <sys/filio.h>
83 #include <sys/mutex.h>
84 #include <sys/namei.h>
87 #if defined(COMPAT_43)
88 #include <sys/ioctl_compat.h>
95 #include <sys/fcntl.h>
98 #include <sys/kernel.h>
99 #include <sys/vnode.h>
100 #include <sys/serial.h>
101 #include <sys/signalvar.h>
102 #include <sys/resourcevar.h>
103 #include <sys/malloc.h>
104 #include <sys/filedesc.h>
105 #include <sys/sched.h>
106 #include <sys/sysctl.h>
107 #include <sys/timepps.h>
109 #include <machine/stdarg.h>
113 #include <vm/vm_map.h>
115 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
122 static d_open_t ttysopen;
123 static d_close_t ttysclose;
124 static d_read_t ttysrdwr;
125 static d_ioctl_t ttysioctl;
126 static d_purge_t ttypurge;
128 /* Default cdevsw for common tty devices */
129 static struct cdevsw tty_cdevsw = {
130 .d_version = D_VERSION,
136 .d_flags = D_TTY | D_NEEDGIANT,
139 /* Cdevsw for slave tty devices */
140 static struct cdevsw ttys_cdevsw = {
141 .d_version = D_VERSION,
143 .d_close = ttysclose,
146 .d_ioctl = ttysioctl,
148 .d_flags = D_TTY | D_NEEDGIANT,
151 static int proc_compare(struct proc *p1, struct proc *p2);
152 static int ttnread(struct tty *tp);
153 static void ttyecho(int c, struct tty *tp);
154 static int ttyoutput(int c, struct tty *tp);
155 static void ttypend(struct tty *tp);
156 static void ttyretype(struct tty *tp);
157 static void ttyrub(int c, struct tty *tp);
158 static void ttyrubo(struct tty *tp, int cnt);
159 static void ttyunblock(struct tty *tp);
160 static int ttywflush(struct tty *tp);
161 static int filt_ttyread(struct knote *kn, long hint);
162 static void filt_ttyrdetach(struct knote *kn);
163 static int filt_ttywrite(struct knote *kn, long hint);
164 static void filt_ttywdetach(struct knote *kn);
167 * Table with character classes and parity. The 8th bit indicates parity,
168 * the 7th bit indicates the character is an alphameric or underscore (for
169 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
170 * are 0 then the character needs no special processing on output; classes
171 * other than 0 might be translated or (not currently) require delays.
173 #define E 0x00 /* Even parity. */
174 #define O 0x80 /* Odd parity. */
175 #define PARITY(c) (char_type[c] & O)
177 #define ALPHA 0x40 /* Alpha or underscore. */
178 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
180 #define CCLASSMASK 0x3f
181 #define CCLASS(c) (char_type[c] & CCLASSMASK)
186 #define NA ORDINARY | ALPHA
192 static u_char const char_type[] = {
193 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
194 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
195 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
196 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
197 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
198 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
199 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
200 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
201 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
202 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
203 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
204 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
205 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
206 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
207 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
208 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
210 * Meta chars; should be settable per character set;
211 * for now, treat them all as normal characters.
213 NA, NA, NA, NA, NA, NA, NA, NA,
214 NA, NA, NA, NA, NA, NA, NA, NA,
215 NA, NA, NA, NA, NA, NA, NA, NA,
216 NA, NA, NA, NA, NA, NA, NA, NA,
217 NA, NA, NA, NA, NA, NA, NA, NA,
218 NA, NA, NA, NA, NA, NA, NA, NA,
219 NA, NA, NA, NA, NA, NA, NA, NA,
220 NA, NA, NA, NA, NA, NA, NA, NA,
221 NA, NA, NA, NA, NA, NA, NA, NA,
222 NA, NA, NA, NA, NA, NA, NA, NA,
223 NA, NA, NA, NA, NA, NA, NA, NA,
224 NA, NA, NA, NA, NA, NA, NA, NA,
225 NA, NA, NA, NA, NA, NA, NA, NA,
226 NA, NA, NA, NA, NA, NA, NA, NA,
227 NA, NA, NA, NA, NA, NA, NA, NA,
228 NA, NA, NA, NA, NA, NA, NA, NA,
239 /* Macros to clear/set/test flags. */
240 #define SET(t, f) (t) |= (f)
241 #define CLR(t, f) (t) &= ~(f)
242 #define ISSET(t, f) ((t) & (f))
244 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
245 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
248 * list of struct tty where pstat(8) can pick it up with sysctl
250 * The lock order is to grab the list mutex before the tty mutex.
251 * Together with additions going on the tail of the list, this allows
252 * the sysctl to avoid doing retries.
254 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
255 static struct mtx tty_list_mutex;
257 static struct unrhdr *tty_unit;
259 static int drainwait = 5*60;
260 SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait,
261 0, "Output drain timeout in seconds");
264 tty_gettp(struct cdev *dev)
269 csw = dev_refthread(dev);
270 KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev)));
271 KASSERT(csw->d_flags & D_TTY,
272 ("non D_TTY (%s) in tty code", devtoname(dev)));
276 ("no tty pointer on (%s) in tty code", devtoname(dev)));
281 * Initial open of tty, or (re)entry to standard tty line discipline.
284 tty_open(struct cdev *device, struct tty *tp)
291 if (!ISSET(tp->t_state, TS_ISOPEN)) {
293 SET(tp->t_state, TS_ISOPEN);
294 if (ISSET(tp->t_cflag, CLOCAL))
295 SET(tp->t_state, TS_CONNECTED);
296 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
298 /* XXX don't hang forever on output */
299 if (tp->t_timeout < 0)
300 tp->t_timeout = drainwait*hz;
307 * Handle close() on a tty line: flush and set to initial state,
308 * bumping generation number so that pending read/write calls
309 * can detect recycling of the tty.
310 * XXX our caller should have done `spltty(); l_close(); tty_close();'
311 * and l_close() should have flushed, but we repeat the spltty() and
312 * the flush in case there are buggy callers.
315 tty_close(struct tty *tp)
319 funsetown(&tp->t_sigio);
324 ttyflush(tp, FREAD | FWRITE);
325 clist_free_cblocks(&tp->t_canq);
326 clist_free_cblocks(&tp->t_outq);
327 clist_free_cblocks(&tp->t_rawq);
330 tp->t_line = TTYDISC;
333 tp->t_session = NULL;
335 knlist_clear(&tp->t_rsel.si_note, 0);
336 knlist_clear(&tp->t_wsel.si_note, 0);
342 #define FLUSHQ(q) { \
344 ndflush(q, (q)->c_cc); \
347 /* Is 'c' a line delimiter ("break" character)? */
348 #define TTBREAKC(c, lflag) \
349 ((c) == '\n' || (((c) == cc[VEOF] || \
350 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
351 (c) != _POSIX_VDISABLE))
354 * Process input of a single character received on a tty.
357 ttyinput(int c, struct tty *tp)
359 tcflag_t iflag, lflag;
364 * If input is pending take it first.
367 if (ISSET(lflag, PENDIN))
372 if (ISSET(lflag, ICANON)) {
382 * Block further input iff:
383 * current input > threshold AND input is available to user program
384 * AND input flow control is enabled and not yet invoked.
385 * The 3 is slop for PARMRK.
388 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
389 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
390 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
391 !ISSET(tp->t_state, TS_TBLOCK))
394 /* Handle exceptional conditions (break, parity, framing). */
396 err = (ISSET(c, TTY_ERRORMASK));
398 CLR(c, TTY_ERRORMASK);
399 if (ISSET(err, TTY_BI)) {
400 if (ISSET(iflag, IGNBRK))
402 if (ISSET(iflag, BRKINT)) {
403 ttyflush(tp, FREAD | FWRITE);
404 if (tp->t_pgrp != NULL) {
405 PGRP_LOCK(tp->t_pgrp);
406 pgsignal(tp->t_pgrp, SIGINT, 1);
407 PGRP_UNLOCK(tp->t_pgrp);
411 if (ISSET(iflag, PARMRK))
413 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
414 || ISSET(err, TTY_FE)) {
415 if (ISSET(iflag, IGNPAR))
417 else if (ISSET(iflag, PARMRK)) {
419 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
422 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
423 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
424 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
431 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
433 if (!ISSET(lflag, EXTPROC)) {
435 * Check for literal nexting very first
437 if (ISSET(tp->t_state, TS_LNCH)) {
439 CLR(tp->t_state, TS_LNCH);
442 * Scan for special characters. This code
443 * is really just a big case statement with
444 * non-constant cases. The bottom of the
445 * case statement is labeled ``endcase'', so goto
446 * it after a case match, or similar.
450 * Control chars which aren't controlled
451 * by ICANON, ISIG, or IXON.
453 if (ISSET(lflag, IEXTEN)) {
454 if (CCEQ(cc[VLNEXT], c)) {
455 if (ISSET(lflag, ECHO)) {
456 if (ISSET(lflag, ECHOE)) {
457 (void)ttyoutput('^', tp);
458 (void)ttyoutput('\b', tp);
462 SET(tp->t_state, TS_LNCH);
465 if (CCEQ(cc[VDISCARD], c)) {
466 if (ISSET(lflag, FLUSHO))
467 CLR(tp->t_lflag, FLUSHO);
469 ttyflush(tp, FWRITE);
471 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
473 SET(tp->t_lflag, FLUSHO);
481 if (ISSET(lflag, ISIG)) {
482 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
483 if (!ISSET(lflag, NOFLSH))
484 ttyflush(tp, FREAD | FWRITE);
486 if (tp->t_pgrp != NULL) {
487 PGRP_LOCK(tp->t_pgrp);
489 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
490 PGRP_UNLOCK(tp->t_pgrp);
494 if (CCEQ(cc[VSUSP], c)) {
495 if (!ISSET(lflag, NOFLSH))
498 if (tp->t_pgrp != NULL) {
499 PGRP_LOCK(tp->t_pgrp);
500 pgsignal(tp->t_pgrp, SIGTSTP, 1);
501 PGRP_UNLOCK(tp->t_pgrp);
507 * Handle start/stop characters.
509 if (ISSET(iflag, IXON)) {
510 if (CCEQ(cc[VSTOP], c)) {
511 if (!ISSET(tp->t_state, TS_TTSTOP)) {
512 SET(tp->t_state, TS_TTSTOP);
513 (*tp->t_stop)(tp, 0);
516 if (!CCEQ(cc[VSTART], c))
519 * if VSTART == VSTOP then toggle
523 if (CCEQ(cc[VSTART], c))
527 * IGNCR, ICRNL, & INLCR
530 if (ISSET(iflag, IGNCR))
532 else if (ISSET(iflag, ICRNL))
534 } else if (c == '\n' && ISSET(iflag, INLCR))
537 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
539 * From here on down canonical mode character
540 * processing takes place.
543 * erase or erase2 (^H / ^?)
545 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
547 ttyrub(unputc(&tp->t_rawq), tp);
553 if (CCEQ(cc[VKILL], c)) {
554 if (ISSET(lflag, ECHOKE) &&
555 tp->t_rawq.c_cc == tp->t_rocount &&
556 !ISSET(lflag, ECHOPRT))
557 while (tp->t_rawq.c_cc)
558 ttyrub(unputc(&tp->t_rawq), tp);
561 if (ISSET(lflag, ECHOK) ||
562 ISSET(lflag, ECHOKE))
567 CLR(tp->t_state, TS_LOCAL);
573 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
579 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
584 * erase last char of word and remember the
585 * next chars type (for ALTWERASE)
588 c = unputc(&tp->t_rawq);
591 if (c == ' ' || c == '\t') {
592 (void)putc(c, &tp->t_rawq);
601 c = unputc(&tp->t_rawq);
604 } while (c != ' ' && c != '\t' &&
605 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
606 (void)putc(c, &tp->t_rawq);
612 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
617 * ^T - kernel info and generate SIGINFO
619 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
620 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) {
621 PGRP_LOCK(tp->t_pgrp);
622 pgsignal(tp->t_pgrp, SIGINFO, 1);
623 PGRP_UNLOCK(tp->t_pgrp);
625 if (!ISSET(lflag, NOKERNINFO))
631 * Check for input buffer overflow
633 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
635 if (ISSET(iflag, IMAXBEL)) {
636 if (tp->t_outq.c_cc < tp->t_ohiwat)
637 (void)ttyoutput(CTRL('g'), tp);
642 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
643 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
644 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
647 * Put data char in q for user and
648 * wakeup on seeing a line delimiter.
650 if (putc(c, &tp->t_rawq) >= 0) {
651 if (!ISSET(lflag, ICANON)) {
656 if (TTBREAKC(c, lflag)) {
658 catq(&tp->t_rawq, &tp->t_canq);
660 } else if (tp->t_rocount++ == 0)
661 tp->t_rocol = tp->t_column;
662 if (ISSET(tp->t_state, TS_ERASE)) {
664 * end of prterase \.../
666 CLR(tp->t_state, TS_ERASE);
667 (void)ttyoutput('/', tp);
671 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
673 * Place the cursor over the '^' of the ^D.
675 i = imin(2, tp->t_column - i);
677 (void)ttyoutput('\b', tp);
684 * IXANY means allow any character to restart output.
686 if (ISSET(tp->t_state, TS_TTSTOP) &&
687 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
690 CLR(tp->t_lflag, FLUSHO);
691 CLR(tp->t_state, TS_TTSTOP);
693 return (ttstart(tp));
697 * Output a single character on a tty, doing output processing
698 * as needed (expanding tabs, newline processing, etc.).
699 * Returns < 0 if succeeds, otherwise returns char to resend.
703 ttyoutput(int c, struct tty *tp)
709 if (!ISSET(oflag, OPOST)) {
710 if (ISSET(tp->t_lflag, FLUSHO))
712 if (putc(c, &tp->t_outq))
719 * Do tab expansion if OXTABS is set. Special case if we external
720 * processing, we don't do the tab expansion because we'll probably
721 * get it wrong. If tab expansion needs to be done, let it happen
724 CLR(c, ~TTY_CHARMASK);
726 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
727 c = 8 - (tp->t_column & 7);
728 if (!ISSET(tp->t_lflag, FLUSHO)) {
729 s = spltty(); /* Don't interrupt tabs. */
730 c -= b_to_q(" ", c, &tp->t_outq);
736 return (c ? -1 : '\t');
738 if (c == CEOT && ISSET(oflag, ONOEOT))
742 * Newline translation: if ONLCR is set,
743 * translate newline into "\r\n".
745 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
748 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
751 /* If OCRNL is set, translate "\r" into "\n". */
752 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
754 /* If ONOCR is set, don't transmit CRs when on column 0. */
755 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
760 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
772 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
782 col = (col + 8) & ~7;
790 * Ioctls for all tty devices. Called after line-discipline specific ioctl
791 * has been called to do discipline-specific functions and/or reject any
792 * of these ioctl commands.
796 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
801 int s, error, bits, sig, sig2;
803 td = curthread; /* XXX */
806 /* If the ioctl involves modification, hang if in the background. */
831 #if defined(COMPAT_43)
842 sx_slock(&proctree_lock);
844 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
845 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) &&
846 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) {
849 if (pgrp->pg_jobc == 0) {
850 sx_sunlock(&proctree_lock);
854 sx_sunlock(&proctree_lock);
855 pgsignal(pgrp, SIGTTOU, 1);
857 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
861 sx_slock(&proctree_lock);
865 sx_sunlock(&proctree_lock);
869 if (tp->t_break != NULL) {
882 if (tp->t_modem != NULL) {
885 tp->t_modem(tp, SER_DTR, 0);
888 tp->t_modem(tp, 0, SER_DTR);
892 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
893 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1;
894 tp->t_modem(tp, sig, sig2);
898 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
899 tp->t_modem(tp, sig, 0);
903 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
904 tp->t_modem(tp, 0, sig);
907 sig = tp->t_modem(tp, 0, 0);
908 /* See <sys/serial.h. for the "<< 1" stuff */
909 bits = TIOCM_LE + (sig << 1);
917 switch (cmd) { /* Process the ioctl. */
918 case FIOASYNC: /* set/clear async i/o */
921 SET(tp->t_state, TS_ASYNC);
923 CLR(tp->t_state, TS_ASYNC);
926 case FIONBIO: /* set/clear non-blocking i/o */
927 break; /* XXX: delete. */
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))
942 error = fsetown(*(int *)data, &tp->t_sigio);
947 if (tp->t_session != NULL && !isctty(p, tp))
949 *(int *)data = fgetown(&tp->t_sigio);
952 case TIOCEXCL: /* set exclusive use of tty */
954 SET(tp->t_state, TS_XCLUDE);
957 case TIOCFLUSH: { /* flush buffers */
958 int flags = *(int *)data;
961 flags = FREAD | FWRITE;
963 flags &= FREAD | FWRITE;
967 case TIOCCONS: /* become virtual console */
969 struct nameidata nid;
971 if (constty && constty != tp &&
972 ISSET(constty->t_state, TS_CONNECTED))
975 /* Ensure user can open the real console. */
976 NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE,
978 if ((error = namei(&nid)) != 0)
980 NDFREE(&nid, NDF_ONLY_PNBUF);
981 error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td);
987 } else if (tp == constty)
990 case TIOCDRAIN: /* wait till output drained */
995 case TIOCGETA: { /* get termios struct */
996 struct termios *t = (struct termios *)data;
998 bcopy(&tp->t_termios, t, sizeof(struct termios));
1001 case TIOCGETD: /* get line discipline */
1002 *(int *)data = tp->t_line;
1004 case TIOCGWINSZ: /* get window size */
1005 *(struct winsize *)data = tp->t_winsize;
1007 case TIOCGPGRP: /* get pgrp of tty */
1010 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
1013 case TIOCHPCL: /* hang up on last close */
1015 SET(tp->t_cflag, HUPCL);
1020 *(int *)data = tp->t_dtr_wait * 100 / hz;
1023 /* must be root since the wait applies to following logins */
1027 tp->t_dtr_wait = *(int *)data * hz / 100;
1029 case TIOCNXCL: /* reset exclusive use of tty */
1031 CLR(tp->t_state, TS_XCLUDE);
1034 case TIOCOUTQ: /* output queue size */
1035 *(int *)data = tp->t_outq.c_cc;
1037 case TIOCSETA: /* set termios struct */
1038 case TIOCSETAW: /* drain output, set */
1039 case TIOCSETAF: { /* drn out, fls in, set */
1040 struct termios *t = (struct termios *)data;
1042 if (t->c_ispeed == 0)
1043 t->c_ispeed = t->c_ospeed;
1044 if (t->c_ispeed == 0)
1045 t->c_ispeed = tp->t_ospeed;
1046 if (t->c_ispeed == 0)
1049 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1050 error = ttywait(tp);
1055 if (cmd == TIOCSETAF)
1056 ttyflush(tp, FREAD);
1058 if (!ISSET(t->c_cflag, CIGNORE)) {
1060 * Set device hardware.
1062 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
1066 if (ISSET(t->c_cflag, CLOCAL) &&
1067 !ISSET(tp->t_cflag, CLOCAL)) {
1069 * XXX disconnections would be too hard to
1070 * get rid of without this kludge. The only
1071 * way to get rid of controlling terminals
1072 * is to exit from the session leader.
1074 CLR(tp->t_state, TS_ZOMBIE);
1076 wakeup(TSA_CARR_ON(tp));
1080 if ((ISSET(tp->t_state, TS_CARR_ON) ||
1081 ISSET(t->c_cflag, CLOCAL)) &&
1082 !ISSET(tp->t_state, TS_ZOMBIE))
1083 SET(tp->t_state, TS_CONNECTED);
1085 CLR(tp->t_state, TS_CONNECTED);
1086 tp->t_cflag = t->c_cflag;
1087 tp->t_ispeed = t->c_ispeed;
1088 if (t->c_ospeed != 0)
1089 tp->t_ospeed = t->c_ospeed;
1092 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1094 if (ISSET(t->c_lflag, ICANON))
1095 SET(tp->t_lflag, PENDIN);
1098 * XXX we really shouldn't allow toggling
1099 * ICANON while we're in a non-termios line
1100 * discipline. Now we have to worry about
1101 * panicing for a null queue.
1103 if (tp->t_canq.c_cbreserved > 0 &&
1104 tp->t_rawq.c_cbreserved > 0) {
1105 catq(&tp->t_rawq, &tp->t_canq);
1107 * XXX the queue limits may be
1108 * different, so the old queue
1109 * swapping method no longer works.
1111 catq(&tp->t_canq, &tp->t_rawq);
1113 CLR(tp->t_lflag, PENDIN);
1117 tp->t_iflag = t->c_iflag;
1118 tp->t_oflag = t->c_oflag;
1120 * Make the EXTPROC bit read only.
1122 if (ISSET(tp->t_lflag, EXTPROC))
1123 SET(t->c_lflag, EXTPROC);
1125 CLR(t->c_lflag, EXTPROC);
1126 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1127 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1128 t->c_cc[VTIME] != tp->t_cc[VTIME])
1130 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1134 case TIOCSETD: { /* set line discipline */
1135 int t = *(int *)data;
1137 if ((u_int)t >= nlinesw)
1139 if (t == tp->t_line)
1142 ttyld_close(tp, flag);
1144 /* XXX: we should use the correct cdev here */
1145 error = ttyld_open(tp, tp->t_dev);
1148 * If we fail to switch line discipline we cannot
1149 * fall back to the previous, because we can not
1150 * trust that ldisc to open successfully either.
1151 * Fall back to the default ldisc which we know
1152 * will allways succeed.
1154 tp->t_line = TTYDISC;
1155 (void)ttyld_open(tp, tp->t_dev);
1161 case TIOCSTART: /* start output, like ^Q */
1163 if (ISSET(tp->t_state, TS_TTSTOP) ||
1164 ISSET(tp->t_lflag, FLUSHO)) {
1165 CLR(tp->t_lflag, FLUSHO);
1166 CLR(tp->t_state, TS_TTSTOP);
1171 case TIOCSTI: /* simulate terminal input */
1172 if ((flag & FREAD) == 0 && suser(td))
1174 if (!isctty(p, tp) && suser(td))
1177 ttyld_rint(tp, *(u_char *)data);
1180 case TIOCSTOP: /* stop output, like ^S */
1182 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1183 SET(tp->t_state, TS_TTSTOP);
1184 (*tp->t_stop)(tp, 0);
1188 case TIOCSCTTY: /* become controlling tty */
1189 /* Session ctty vnode pointer set in vnode layer. */
1190 sx_slock(&proctree_lock);
1191 if (!SESS_LEADER(p) ||
1192 ((p->p_session->s_ttyvp || tp->t_session) &&
1193 (tp->t_session != p->p_session))) {
1194 sx_sunlock(&proctree_lock);
1197 tp->t_session = p->p_session;
1198 tp->t_pgrp = p->p_pgrp;
1199 SESS_LOCK(p->p_session);
1200 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */
1201 p->p_session->s_ttyp = tp;
1202 SESS_UNLOCK(p->p_session);
1204 p->p_flag |= P_CONTROLT;
1206 sx_sunlock(&proctree_lock);
1208 case TIOCSPGRP: { /* set pgrp of tty */
1209 sx_slock(&proctree_lock);
1210 pgrp = pgfind(*(int *)data);
1211 if (!isctty(p, tp)) {
1214 sx_sunlock(&proctree_lock);
1218 sx_sunlock(&proctree_lock);
1222 if (pgrp->pg_session != p->p_session) {
1223 sx_sunlock(&proctree_lock);
1226 sx_sunlock(&proctree_lock);
1230 case TIOCSTAT: /* simulate control-T */
1235 case TIOCSWINSZ: /* set window size */
1236 if (bcmp((caddr_t)&tp->t_winsize, data,
1237 sizeof (struct winsize))) {
1238 tp->t_winsize = *(struct winsize *)data;
1239 if (tp->t_pgrp != NULL) {
1240 PGRP_LOCK(tp->t_pgrp);
1241 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1242 PGRP_UNLOCK(tp->t_pgrp);
1246 case TIOCSDRAINWAIT:
1250 tp->t_timeout = *(int *)data * hz;
1251 wakeup(TSA_OCOMPLETE(tp));
1252 wakeup(TSA_OLOWAT(tp));
1254 case TIOCGDRAINWAIT:
1255 *(int *)data = tp->t_timeout / hz;
1258 #if defined(COMPAT_43)
1259 #ifndef BURN_BRIDGES
1260 return (ttcompat(tp, cmd, data, flag));
1272 ttypoll(struct cdev *dev, int events, struct thread *td)
1278 tp = tty_gettp(dev);
1280 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1281 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1285 if (events & (POLLIN | POLLRDNORM)) {
1286 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1287 revents |= events & (POLLIN | POLLRDNORM);
1289 selrecord(td, &tp->t_rsel);
1291 if (events & (POLLOUT | POLLWRNORM)) {
1292 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1293 ISSET(tp->t_state, TS_CONNECTED))
1294 || ISSET(tp->t_state, TS_ZOMBIE))
1295 revents |= events & (POLLOUT | POLLWRNORM);
1297 selrecord(td, &tp->t_wsel);
1303 static struct filterops ttyread_filtops =
1304 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1305 static struct filterops ttywrite_filtops =
1306 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1309 ttykqfilter(struct cdev *dev, struct knote *kn)
1312 struct knlist *klist;
1315 tp = tty_gettp(dev);
1317 switch (kn->kn_filter) {
1319 klist = &tp->t_rsel.si_note;
1320 kn->kn_fop = &ttyread_filtops;
1323 klist = &tp->t_wsel.si_note;
1324 kn->kn_fop = &ttywrite_filtops;
1330 kn->kn_hook = (caddr_t)dev;
1333 knlist_add(klist, kn, 0);
1340 filt_ttyrdetach(struct knote *kn)
1342 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty;
1345 knlist_remove(&tp->t_rsel.si_note, kn, 0);
1350 filt_ttyread(struct knote *kn, long hint)
1352 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty;
1354 kn->kn_data = ttnread(tp);
1355 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1356 kn->kn_flags |= EV_EOF;
1359 return (kn->kn_data > 0);
1363 filt_ttywdetach(struct knote *kn)
1365 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty;
1368 knlist_remove(&tp->t_wsel.si_note, kn, 0);
1373 filt_ttywrite(struct knote *kn, long hint)
1375 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty;
1377 kn->kn_data = tp->t_outq.c_cc;
1378 if (ISSET(tp->t_state, TS_ZOMBIE))
1380 return (kn->kn_data <= tp->t_olowat &&
1381 ISSET(tp->t_state, TS_CONNECTED));
1385 * Must be called at spltty().
1388 ttnread(struct tty *tp)
1392 if (ISSET(tp->t_lflag, PENDIN))
1394 nread = tp->t_canq.c_cc;
1395 if (!ISSET(tp->t_lflag, ICANON)) {
1396 nread += tp->t_rawq.c_cc;
1397 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1404 * Wait for output to drain.
1407 ttywait(struct tty *tp)
1413 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1414 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1416 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1417 ISSET(tp->t_state, TS_CONNECTED)) {
1418 SET(tp->t_state, TS_SO_OCOMPLETE);
1419 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1420 TTOPRI | PCATCH, "ttywai",
1423 if (error == EWOULDBLOCK)
1430 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1437 * Flush if successfully wait.
1440 ttywflush(struct tty *tp)
1444 if ((error = ttywait(tp)) == 0)
1445 ttyflush(tp, FREAD);
1450 * Flush tty read and/or write queues, notifying anyone waiting.
1453 ttyflush(struct tty *tp, int rw)
1462 FLUSHQ(&tp->t_outq);
1463 CLR(tp->t_state, TS_TTSTOP);
1465 (*tp->t_stop)(tp, rw);
1467 FLUSHQ(&tp->t_canq);
1468 FLUSHQ(&tp->t_rawq);
1469 CLR(tp->t_lflag, PENDIN);
1472 CLR(tp->t_state, TS_LOCAL);
1474 if (ISSET(tp->t_state, TS_TBLOCK)) {
1476 FLUSHQ(&tp->t_outq);
1480 * Don't let leave any state that might clobber the
1481 * next line discipline (although we should do more
1482 * to send the START char). Not clearing the state
1483 * may have caused the "putc to a clist with no
1484 * reserved cblocks" panic/printf.
1486 CLR(tp->t_state, TS_TBLOCK);
1488 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1489 if (ISSET(tp->t_iflag, IXOFF)) {
1491 * XXX wait a bit in the hope that the stop
1492 * character (if any) will go out. Waiting
1493 * isn't good since it allows races. This
1494 * will be fixed when the stop character is
1495 * put in a special queue. Don't bother with
1496 * the checks in ttywait() since the timeout
1499 SET(tp->t_state, TS_SO_OCOMPLETE);
1500 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1503 * Don't try sending the stop character again.
1505 CLR(tp->t_state, TS_TBLOCK);
1512 FLUSHQ(&tp->t_outq);
1519 * Copy in the default termios characters.
1522 termioschars(struct termios *t)
1525 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1532 ttychars(struct tty *tp)
1535 termioschars(&tp->t_termios);
1539 * Handle input high water. Send stop character for the IXOFF case. Turn
1540 * on our input flow control bit and propagate the changes to the driver.
1541 * XXX the stop character should be put in a special high priority queue.
1544 ttyblock(struct tty *tp)
1547 SET(tp->t_state, TS_TBLOCK);
1548 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1549 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1550 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1555 * Handle input low water. Send start character for the IXOFF case. Turn
1556 * off our input flow control bit and propagate the changes to the driver.
1557 * XXX the start character should be put in a special high priority queue.
1560 ttyunblock(struct tty *tp)
1563 CLR(tp->t_state, TS_TBLOCK);
1564 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1565 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1566 SET(tp->t_state, TS_TBLOCK); /* try again later */
1571 /* Not used by any current (i386) drivers. */
1573 * Restart after an inter-char delay.
1576 ttrstrt(void *tp_arg)
1581 KASSERT(tp_arg != NULL, ("ttrstrt"));
1586 CLR(tp->t_state, TS_TIMEOUT);
1594 ttstart(struct tty *tp)
1597 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1603 * "close" a line discipline
1606 ttylclose(struct tty *tp, int flag)
1609 if (flag & FNONBLOCK || ttywflush(tp))
1610 ttyflush(tp, FREAD | FWRITE);
1615 * Handle modem control transition on a tty.
1616 * Flag indicates new state of carrier.
1617 * Returns 0 if the line should be turned off, otherwise 1.
1620 ttymodem(struct tty *tp, int flag)
1623 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1625 * MDMBUF: do flow control according to carrier flag
1626 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1627 * works if IXON and IXANY are clear.
1630 CLR(tp->t_state, TS_CAR_OFLOW);
1631 CLR(tp->t_state, TS_TTSTOP);
1633 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1634 SET(tp->t_state, TS_CAR_OFLOW);
1635 SET(tp->t_state, TS_TTSTOP);
1636 (*tp->t_stop)(tp, 0);
1638 } else if (flag == 0) {
1642 CLR(tp->t_state, TS_CARR_ON);
1643 if (ISSET(tp->t_state, TS_ISOPEN) &&
1644 !ISSET(tp->t_cflag, CLOCAL)) {
1645 SET(tp->t_state, TS_ZOMBIE);
1646 CLR(tp->t_state, TS_CONNECTED);
1647 if (tp->t_session) {
1648 sx_slock(&proctree_lock);
1649 if (tp->t_session->s_leader) {
1652 p = tp->t_session->s_leader;
1657 sx_sunlock(&proctree_lock);
1659 ttyflush(tp, FREAD | FWRITE);
1666 SET(tp->t_state, TS_CARR_ON);
1667 if (!ISSET(tp->t_state, TS_ZOMBIE))
1668 SET(tp->t_state, TS_CONNECTED);
1669 wakeup(TSA_CARR_ON(tp));
1677 * Reinput pending characters after state switch
1681 ttypend(struct tty *tp)
1686 CLR(tp->t_lflag, PENDIN);
1687 SET(tp->t_state, TS_TYPEN);
1689 * XXX this assumes too much about clist internals. It may even
1690 * fail if the cblock slush pool is empty. We can't allocate more
1691 * cblocks here because we are called from an interrupt handler
1692 * and clist_alloc_cblocks() can wait.
1695 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1696 tp->t_rawq.c_cbmax = tq.c_cbmax;
1697 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1698 while ((c = getc(&tq)) >= 0)
1700 CLR(tp->t_state, TS_TYPEN);
1704 * Process a read call on a tty device.
1707 ttread(struct tty *tp, struct uio *uio, int flag)
1712 cc_t *cc = tp->t_cc;
1715 int s, first, error = 0;
1716 int has_stime = 0, last_cc = 0;
1717 long slp = 0; /* XXX this should be renamed `timo'. */
1718 struct timeval stime;
1725 lflag = tp->t_lflag;
1727 * take pending input first
1729 if (ISSET(lflag, PENDIN)) {
1731 splx(s); /* reduce latency */
1733 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1737 * Hang process if it's in the background.
1739 if (isbackground(p, tp)) {
1741 sx_slock(&proctree_lock);
1743 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) ||
1744 SIGISMEMBER(td->td_sigmask, SIGTTIN) ||
1745 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) {
1747 sx_sunlock(&proctree_lock);
1753 sx_sunlock(&proctree_lock);
1754 pgsignal(pg, SIGTTIN, 1);
1756 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1762 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1764 return (0); /* EOF */
1768 * If canonical, use the canonical queue,
1769 * else use the raw queue.
1771 * (should get rid of clists...)
1773 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1775 if (flag & IO_NDELAY) {
1778 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1783 return (EWOULDBLOCK);
1785 if (!ISSET(lflag, ICANON)) {
1788 struct timeval timecopy;
1791 * Check each of the four combinations.
1792 * (m > 0 && t == 0) is the normal read case.
1793 * It should be fairly efficient, so we check that and its
1794 * companion case (m == 0 && t == 0) first.
1795 * For the other two cases, we compute the target sleep time
1804 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1808 t *= 100000; /* time in us */
1809 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1810 ((t1).tv_usec - (t2).tv_usec))
1816 getmicrotime(&timecopy);
1818 /* first character, start timer */
1822 } else if (qp->c_cc > last_cc) {
1823 /* got a character, restart timer */
1827 /* nothing, check expiration */
1828 slp = t - diff(timecopy, stime);
1833 } else { /* m == 0 */
1836 getmicrotime(&timecopy);
1842 slp = t - diff(timecopy, stime);
1844 /* Timed out, but 0 is enough input. */
1852 * Rounding down may make us wake up just short
1853 * of the target, so we round up.
1854 * The formula is ceiling(slp * hz/1000000).
1855 * 32-bit arithmetic is enough for hz < 169.
1856 * XXX see tvtohz() for how to avoid overflow if hz
1857 * is large (divide by `tick' and/or arrange to
1858 * use tvtohz() if hz is large).
1860 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1863 if (qp->c_cc <= 0) {
1866 * There is no input, or not enough input and we can block.
1868 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1869 ISSET(tp->t_state, TS_CONNECTED) ?
1870 "ttyin" : "ttyhup", (int)slp);
1872 if (error == EWOULDBLOCK)
1877 * XXX what happens if another process eats some input
1878 * while we are asleep (not just here)? It would be
1879 * safest to detect changes and reset our state variables
1880 * (has_stime and last_cc).
1888 * Input present, check for input mapping and processing.
1891 if (ISSET(lflag, ICANON | ISIG))
1897 icc = imin(uio->uio_resid, IBUFSIZ);
1898 icc = q_to_b(qp, ibuf, icc);
1904 error = uiomove(ibuf, icc, uio);
1906 * XXX if there was an error then we should ungetc() the
1907 * unmoved chars and reduce icc here.
1911 if (uio->uio_resid == 0)
1925 * delayed suspend (^Y)
1927 if (CCEQ(cc[VDSUSP], c) &&
1928 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1929 if (tp->t_pgrp != NULL) {
1930 PGRP_LOCK(tp->t_pgrp);
1931 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1932 PGRP_UNLOCK(tp->t_pgrp);
1935 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1944 * Interpret EOF only in canonical mode.
1946 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1949 * Give user character.
1951 error = ureadc(c, uio);
1953 /* XXX should ungetc(c, qp). */
1955 if (uio->uio_resid == 0)
1958 * In canonical mode check for a "break character"
1959 * marking the end of a "line of input".
1961 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1968 * Look to unblock input now that (presumably)
1969 * the input queue has gone down.
1972 if (ISSET(tp->t_state, TS_TBLOCK) &&
1973 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1981 * Check the output queue on tp for space for a kernel message (from uprintf
1982 * or tprintf). Allow some space over the normal hiwater mark so we don't
1983 * lose messages due to normal flow control, but don't let the tty run amok.
1984 * Sleeps here are not interruptible, but we return prematurely if new signals
1988 ttycheckoutq(struct tty *tp, int wait)
1997 hiwat = tp->t_ohiwat;
1998 SIGEMPTYSET(oldmask);
2002 oldmask = td->td_siglist;
2005 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
2006 while (tp->t_outq.c_cc > hiwat) {
2008 if (tp->t_outq.c_cc <= hiwat)
2015 if (!SIGSETEQ(td->td_siglist, oldmask)) {
2021 SET(tp->t_state, TS_SO_OLOWAT);
2022 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
2029 * Process a write call on a tty device.
2032 ttwrite(struct tty *tp, struct uio *uio, int flag)
2038 int i, hiwat, cnt, error, s;
2041 hiwat = tp->t_ohiwat;
2042 cnt = uio->uio_resid;
2049 if (ISSET(tp->t_state, TS_ZOMBIE)) {
2051 if (uio->uio_resid == cnt)
2055 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2056 if (flag & IO_NDELAY) {
2058 error = EWOULDBLOCK;
2061 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
2070 * Hang the process if it's in the background.
2072 sx_slock(&proctree_lock);
2074 if (isbackground(p, tp) &&
2075 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
2076 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) &&
2077 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) {
2078 if (p->p_pgrp->pg_jobc == 0) {
2080 sx_sunlock(&proctree_lock);
2085 PGRP_LOCK(p->p_pgrp);
2086 sx_sunlock(&proctree_lock);
2087 pgsignal(p->p_pgrp, SIGTTOU, 1);
2088 PGRP_UNLOCK(p->p_pgrp);
2089 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
2095 sx_sunlock(&proctree_lock);
2098 * Process the user's data in at most OBUFSIZ chunks. Perform any
2099 * output translation. Keep track of high water mark, sleep on
2100 * overflow awaiting device aid in acquiring new space.
2102 while (uio->uio_resid > 0 || cc > 0) {
2103 if (ISSET(tp->t_lflag, FLUSHO)) {
2107 if (tp->t_outq.c_cc > hiwat)
2110 * Grab a hunk of data from the user, unless we have some
2111 * leftover from last time.
2114 cc = imin(uio->uio_resid, OBUFSIZ);
2116 error = uiomove(cp, cc, uio);
2123 * If nothing fancy need be done, grab those characters we
2124 * can handle without any of ttyoutput's processing and
2125 * just transfer them to the output q. For those chars
2126 * which require special processing (as indicated by the
2127 * bits in char_type), call ttyoutput. After processing
2128 * a hunk of data, look for FLUSHO so ^O's will take effect
2132 if (!ISSET(tp->t_oflag, OPOST))
2135 ce = cc - scanc((u_int)cc, (u_char *)cp,
2136 char_type, CCLASSMASK);
2138 * If ce is zero, then we're processing
2139 * a special character through ttyoutput.
2143 if (ttyoutput(*cp, tp) >= 0) {
2144 /* No Clists, wait a bit. */
2146 if (flag & IO_NDELAY) {
2147 error = EWOULDBLOCK;
2150 error = ttysleep(tp, &lbolt,
2159 if (ISSET(tp->t_lflag, FLUSHO) ||
2160 tp->t_outq.c_cc > hiwat)
2166 * A bunch of normal characters have been found.
2167 * Transfer them en masse to the output queue and
2168 * continue processing at the top of the loop.
2169 * If there are any further characters in this
2170 * <= OBUFSIZ chunk, the first should be a character
2171 * requiring special handling by ttyoutput.
2174 i = b_to_q(cp, ce, &tp->t_outq);
2177 cp += ce, cc -= ce, tk_nout += ce;
2180 /* No Clists, wait a bit. */
2182 if (flag & IO_NDELAY) {
2183 error = EWOULDBLOCK;
2186 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
2192 if (ISSET(tp->t_lflag, FLUSHO) ||
2193 tp->t_outq.c_cc > hiwat)
2200 * If cc is nonzero, we leave the uio structure inconsistent, as the
2201 * offset and iov pointers have moved forward, but it doesn't matter
2202 * (the call will either return short or restart with a new uio).
2204 uio->uio_resid += cc;
2211 * This can only occur if FLUSHO is set in t_lflag,
2212 * or if ttstart/oproc is synchronous (or very fast).
2214 if (tp->t_outq.c_cc <= hiwat) {
2218 if (flag & IO_NDELAY) {
2220 uio->uio_resid += cc;
2221 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2223 SET(tp->t_state, TS_SO_OLOWAT);
2224 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
2227 if (error == EWOULDBLOCK)
2235 * Rubout one character from the rawq of tp
2236 * as cleanly as possible.
2239 ttyrub(int c, struct tty *tp)
2245 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2247 CLR(tp->t_lflag, FLUSHO);
2248 if (ISSET(tp->t_lflag, ECHOE)) {
2249 if (tp->t_rocount == 0) {
2251 * Screwed by ttwrite; retype
2256 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2259 CLR(c, ~TTY_CHARMASK);
2260 switch (CCLASS(c)) {
2269 if (ISSET(tp->t_lflag, ECHOCTL))
2273 if (tp->t_rocount < tp->t_rawq.c_cc) {
2278 savecol = tp->t_column;
2279 SET(tp->t_state, TS_CNTTB);
2280 SET(tp->t_lflag, FLUSHO);
2281 tp->t_column = tp->t_rocol;
2282 cp = tp->t_rawq.c_cf;
2284 tabc = *cp; /* XXX FIX NEXTC */
2285 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2287 CLR(tp->t_lflag, FLUSHO);
2288 CLR(tp->t_state, TS_CNTTB);
2291 /* savecol will now be length of the tab. */
2292 savecol -= tp->t_column;
2293 tp->t_column += savecol;
2295 savecol = 8; /* overflow screw */
2296 while (--savecol >= 0)
2297 (void)ttyoutput('\b', tp);
2300 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2301 (void)printf(PANICSTR, c, CCLASS(c));
2303 panic(PANICSTR, c, CCLASS(c));
2307 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2308 if (!ISSET(tp->t_state, TS_ERASE)) {
2309 SET(tp->t_state, TS_ERASE);
2310 (void)ttyoutput('\\', tp);
2314 ttyecho(tp->t_cc[VERASE], tp);
2316 * This code may be executed not only when an ERASE key
2317 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2318 * So, I didn't think it was worthwhile to pass the extra
2319 * information (which would need an extra parameter,
2320 * changing every call) needed to distinguish the ERASE2
2321 * case from the ERASE.
2328 * Back over cnt characters, erasing them.
2331 ttyrubo(struct tty *tp, int cnt)
2335 (void)ttyoutput('\b', tp);
2336 (void)ttyoutput(' ', tp);
2337 (void)ttyoutput('\b', tp);
2343 * Reprint the rawq line. Note, it is assumed that c_cc has already
2347 ttyretype(struct tty *tp)
2352 /* Echo the reprint character. */
2353 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2354 ttyecho(tp->t_cc[VREPRINT], tp);
2356 (void)ttyoutput('\n', tp);
2360 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2361 * BIT OF FIRST CHAR.
2364 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2365 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2367 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2368 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2370 CLR(tp->t_state, TS_ERASE);
2373 tp->t_rocount = tp->t_rawq.c_cc;
2378 * Echo a typed character to the terminal.
2381 ttyecho(int c, struct tty *tp)
2384 if (!ISSET(tp->t_state, TS_CNTTB))
2385 CLR(tp->t_lflag, FLUSHO);
2386 if ((!ISSET(tp->t_lflag, ECHO) &&
2387 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2388 ISSET(tp->t_lflag, EXTPROC))
2390 if (ISSET(tp->t_lflag, ECHOCTL) &&
2391 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2392 ISSET(c, TTY_CHARMASK) == 0177)) {
2393 (void)ttyoutput('^', tp);
2394 CLR(c, ~TTY_CHARMASK);
2400 (void)ttyoutput(c, tp);
2404 * Wake up any readers on a tty.
2407 ttwakeup(struct tty *tp)
2410 if (SEL_WAITING(&tp->t_rsel))
2411 selwakeuppri(&tp->t_rsel, TTIPRI);
2412 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2413 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
2414 wakeup(TSA_HUP_OR_INPUT(tp));
2415 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0);
2419 * Wake up any writers on a tty.
2422 ttwwakeup(struct tty *tp)
2425 if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat)
2426 selwakeuppri(&tp->t_wsel, TTOPRI);
2427 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2428 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
2429 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2430 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2431 CLR(tp->t_state, TS_SO_OCOMPLETE);
2432 wakeup(TSA_OCOMPLETE(tp));
2434 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2435 tp->t_outq.c_cc <= tp->t_olowat) {
2436 CLR(tp->t_state, TS_SO_OLOWAT);
2437 wakeup(TSA_OLOWAT(tp));
2439 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0);
2443 * Look up a code for a specified speed in a conversion table;
2444 * used by drivers to map software speed values to hardware parameters.
2447 ttspeedtab(int speed, struct speedtab *table)
2450 for ( ; table->sp_speed != -1; table++)
2451 if (table->sp_speed == speed)
2452 return (table->sp_code);
2457 * Set input and output watermarks and buffer sizes. For input, the
2458 * high watermark is about one second's worth of input above empty, the
2459 * low watermark is slightly below high water, and the buffer size is a
2460 * driver-dependent amount above high water. For output, the watermarks
2461 * are near the ends of the buffer, with about 1 second's worth of input
2462 * between them. All this only applies to the standard line discipline.
2465 ttsetwater(struct tty *tp)
2467 int cps, ttmaxhiwat, x;
2470 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2471 switch (tp->t_ispeedwat) {
2473 cps = tp->t_ispeed / 10;
2477 * This case is for old drivers that don't know about
2478 * t_ispeedwat. Arrange for them to get the old buffer
2479 * sizes and watermarks.
2481 cps = TTYHOG - 2 * 256;
2482 tp->t_ififosize = 2 * 256;
2485 cps = tp->t_ispeedwat / 10;
2489 tp->t_ilowat = 7 * cps / 8;
2490 x = cps + tp->t_ififosize;
2491 clist_alloc_cblocks(&tp->t_rawq, x, x);
2494 switch (tp->t_ospeedwat) {
2496 cps = tp->t_ospeed / 10;
2497 ttmaxhiwat = 2 * TTMAXHIWAT;
2500 cps = tp->t_ospeed / 10;
2501 ttmaxhiwat = TTMAXHIWAT;
2504 cps = tp->t_ospeedwat / 10;
2505 ttmaxhiwat = 8 * TTMAXHIWAT;
2508 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2509 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2511 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2512 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2513 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2515 clist_alloc_cblocks(&tp->t_outq, x, x);
2520 * Report on state of foreground process group.
2523 ttyinfo(struct tty *tp)
2525 struct timeval utime, stime;
2526 struct proc *p, *pick;
2528 const char *stateprefix, *state;
2532 if (ttycheckoutq(tp,0) == 0)
2535 /* Print load average. */
2536 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2537 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100);
2540 * On return following a ttyprintf(), we set tp->t_rocount to 0 so
2541 * that pending input will be retyped on BS.
2543 if (tp->t_session == NULL) {
2544 ttyprintf(tp, "not a controlling terminal\n");
2548 if (tp->t_pgrp == NULL) {
2549 ttyprintf(tp, "no foreground process group\n");
2553 sx_slock(&proctree_lock);
2554 if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) {
2555 sx_sunlock(&proctree_lock);
2556 ttyprintf(tp, "empty foreground process group\n");
2562 * Pick the most interesting process and copy some of its
2563 * state for printing later. sched_lock must be held for
2564 * most parts of this. Holding it throughout is simplest
2565 * and prevents even unimportant inconsistencies in the
2566 * copy of the state, but may increase interrupt latency
2569 mtx_lock_spin(&sched_lock);
2570 for (pick = NULL; p != NULL; p = LIST_NEXT(p, p_pglist))
2571 if (proc_compare(pick, p))
2574 td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */
2576 KASSERT(td != NULL, ("ttyinfo: no thread"));
2579 mtx_unlock_spin(&sched_lock);
2580 sx_sunlock(&proctree_lock);
2581 ttyprintf(tp, "foreground process without thread\n");
2587 if (TD_IS_RUNNING(td))
2589 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td))
2591 else if (TD_IS_SLEEPING(td)) {
2592 /* XXX: If we're sleeping, are we ever not in a queue? */
2593 if (TD_ON_SLEEPQ(td))
2594 state = td->td_wmesg;
2596 state = "sleeping without queue";
2597 } else if (TD_ON_LOCK(td)) {
2598 state = td->td_lockname;
2600 } else if (TD_IS_SUSPENDED(td))
2601 state = "suspended";
2602 else if (TD_AWAITING_INTR(td))
2606 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT;
2607 if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE)
2610 rss = pgtok(vmspace_resident_count(pick->p_vmspace));
2611 mtx_unlock_spin(&sched_lock);
2613 calcru(pick, &utime, &stime);
2616 /* Print command, pid, state, utime, stime, %cpu, and rss. */
2618 " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n",
2619 pick->p_comm, pick->p_pid, stateprefix, state,
2620 (long)utime.tv_sec, utime.tv_usec / 10000,
2621 (long)stime.tv_sec, stime.tv_usec / 10000,
2624 sx_sunlock(&proctree_lock);
2628 * Returns 1 if p2 is "better" than p1
2630 * The algorithm for picking the "interesting" process is thus:
2632 * 1) Only foreground processes are eligible - implied.
2633 * 2) Runnable processes are favored over anything else. The runner
2634 * with the highest cpu utilization is picked (p_estcpu). Ties are
2635 * broken by picking the highest pid.
2636 * 3) The sleeper with the shortest sleep time is next. With ties,
2637 * we pick out just "short-term" sleepers (P_SINTR == 0).
2638 * 4) Further ties are broken by picking the highest pid.
2640 #define ISRUN(p, val) \
2642 struct thread *td; \
2644 FOREACH_THREAD_IN_PROC(p, td) { \
2645 if (TD_ON_RUNQ(td) || \
2646 TD_IS_RUNNING(td)) { \
2653 #define TESTAB(a, b) ((a)<<1 | (b))
2659 proc_compare(struct proc *p1, struct proc *p2)
2664 mtx_assert(&sched_lock, MA_OWNED);
2672 * see if at least one of them is runnable
2674 switch (TESTAB(esta, estb)) {
2681 * tie - favor one with highest recent cpu utilization
2684 FOREACH_KSEGRP_IN_PROC(p1,kg) {
2685 esta += kg->kg_estcpu;
2687 FOREACH_KSEGRP_IN_PROC(p2,kg) {
2688 estb += kg->kg_estcpu;
2694 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2699 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) {
2705 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2710 * pick the one with the smallest sleep time
2712 if (p2->p_slptime > p1->p_slptime)
2714 if (p1->p_slptime > p2->p_slptime)
2717 * favor one sleeping in a non-interruptible sleep
2719 if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0)
2721 if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0)
2724 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2728 * Output char to tty; console putchar style.
2731 tputchar(int c, struct tty *tp)
2736 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2741 (void)ttyoutput('\r', tp);
2742 (void)ttyoutput(c, tp);
2749 * Sleep on chan, returning ERESTART if tty changed while we napped and
2750 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2751 * the tty is revoked, restarting a pending call will redo validation done
2752 * at the start of the call.
2755 ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo)
2761 error = tsleep(chan, pri, wmesg, timo);
2762 if (tp->t_state & TS_GONE)
2766 return (tp->t_gen == gen ? 0 : ERESTART);
2770 * Gain a reference to a TTY
2773 ttyref(struct tty *tp)
2777 mtx_lock(&tp->t_mtx);
2778 KASSERT(tp->t_refcnt > 0,
2779 ("ttyref(): tty refcnt is %d (%s)",
2780 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??"));
2782 mtx_unlock(&tp->t_mtx);
2787 * Drop a reference to a TTY.
2788 * When reference count drops to zero, we free it.
2791 ttyrel(struct tty *tp)
2795 mtx_lock(&tty_list_mutex);
2796 mtx_lock(&tp->t_mtx);
2797 KASSERT(tp->t_refcnt > 0,
2798 ("ttyrel(): tty refcnt is %d (%s)",
2799 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??"));
2802 mtx_unlock(&tp->t_mtx);
2803 mtx_unlock(&tty_list_mutex);
2806 TAILQ_REMOVE(&tty_list, tp, t_list);
2807 mtx_unlock(&tp->t_mtx);
2808 mtx_unlock(&tty_list_mutex);
2809 knlist_destroy(&tp->t_rsel.si_note);
2810 knlist_destroy(&tp->t_wsel.si_note);
2811 mtx_destroy(&tp->t_mtx);
2817 * Allocate a tty struct. Clists in the struct will be allocated by
2821 ttymalloc(struct tty *tp)
2826 mtx_init(&tty_list_mutex, "ttylist", NULL, MTX_DEF);
2832 * XXX: Either this argument should go away, or we should
2833 * XXX: require it and do a ttyrel(tp) here and allocate
2834 * XXX: a new tty. For now do nothing.
2838 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO);
2839 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF);
2842 * Set up the initial state
2846 tp->t_dtr_wait = 3 * hz;
2848 tp->t_init_in.c_iflag = TTYDEF_IFLAG;
2849 tp->t_init_in.c_oflag = TTYDEF_OFLAG;
2850 tp->t_init_in.c_cflag = TTYDEF_CFLAG;
2851 tp->t_init_in.c_lflag = TTYDEF_LFLAG;
2852 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = TTYDEF_SPEED;
2853 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc);
2855 /* Make callout the same as callin */
2856 tp->t_init_out = tp->t_init_in;
2858 mtx_lock(&tty_list_mutex);
2859 TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
2860 mtx_unlock(&tty_list_mutex);
2861 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx);
2862 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx);
2870 return (ttymalloc(NULL));
2874 ttypurge(struct cdev *dev)
2877 if (dev->si_tty == NULL)
2879 ttygone(dev->si_tty);
2885 * Create the device entries for this tty thereby opening it for business.
2887 * The flags argument controls if "cua" units are created.
2889 * The t_sc filed is copied to si_drv1 in the created cdevs. This
2890 * is particularly important for ->t_cioctl() users.
2892 * XXX: implement the init and lock devices by cloning.
2896 ttycreate(struct tty *tp, struct cdevsw *csw, int unit, int flags, const char *fmt, ...)
2898 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */
2901 int i, minor, sminor, sunit;
2903 mtx_assert(&Giant, MA_OWNED);
2905 if (tty_unit == NULL)
2906 tty_unit = new_unrhdr(0, 0xffff);
2908 sunit = alloc_unr(tty_unit);
2909 tp->t_devunit = sunit;
2915 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge,
2916 ("tty should not have d_purge"));
2918 csw->d_purge = ttypurge;
2920 minor = unit2minor(unit);
2921 sminor = unit2minor(sunit);
2923 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap);
2925 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf));
2927 cp = make_dev(csw, minor,
2928 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf);
2932 cp->si_drv1 = tp->t_sc;
2934 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT,
2935 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf);
2936 dev_depends(tp->t_dev, cp);
2937 cp->si_drv1 = tp->t_sc;
2938 cp->si_drv2 = &tp->t_init_in;
2941 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK,
2942 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf);
2943 dev_depends(tp->t_dev, cp);
2944 cp->si_drv1 = tp->t_sc;
2945 cp->si_drv2 = &tp->t_lock_in;
2948 if (flags & MINOR_CALLOUT) {
2949 cp = make_dev(csw, minor | MINOR_CALLOUT,
2950 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf);
2951 dev_depends(tp->t_dev, cp);
2952 cp->si_drv1 = tp->t_sc;
2955 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT,
2956 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf);
2957 dev_depends(tp->t_dev, cp);
2958 cp->si_drv1 = tp->t_sc;
2959 cp->si_drv2 = &tp->t_init_out;
2962 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK,
2963 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf);
2964 dev_depends(tp->t_dev, cp);
2965 cp->si_drv1 = tp->t_sc;
2966 cp->si_drv2 = &tp->t_lock_out;
2974 * This function is called when the hardware disappears. We set a flag
2975 * and wake up stuff so all sleeping threads will notice.
2978 ttygone(struct tty *tp)
2981 tp->t_state |= TS_GONE;
2982 wakeup(&tp->t_dtr_wait);
2983 wakeup(TSA_CARR_ON(tp));
2984 wakeup(TSA_HUP_OR_INPUT(tp));
2985 wakeup(TSA_OCOMPLETE(tp));
2986 wakeup(TSA_OLOWAT(tp));
2987 if (tp->t_purge != NULL)
2994 * Called when the driver is ready to free the tty structure.
2996 * XXX: This shall sleep until all threads have left the driver.
3000 ttyfree(struct tty *tp)
3004 mtx_assert(&Giant, MA_OWNED);
3006 unit = tp->t_devunit;
3007 destroy_dev(tp->t_mdev);
3008 free_unr(tty_unit, unit);
3012 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
3014 struct tty *tp, *tp2;
3019 mtx_lock(&tty_list_mutex);
3020 tp = TAILQ_FIRST(&tty_list);
3023 mtx_unlock(&tty_list_mutex);
3024 while (tp != NULL) {
3025 bzero(&xt, sizeof xt);
3026 xt.xt_size = sizeof xt;
3027 #define XT_COPY(field) xt.xt_##field = tp->t_##field
3028 xt.xt_rawcc = tp->t_rawq.c_cc;
3029 xt.xt_cancc = tp->t_canq.c_cc;
3030 xt.xt_outcc = tp->t_outq.c_cc;
3032 if (tp->t_dev != NULL)
3033 xt.xt_dev = dev2udev(tp->t_dev);
3037 if (tp->t_pgrp != NULL)
3038 xt.xt_pgid = tp->t_pgrp->pg_id;
3039 if (tp->t_session != NULL)
3040 xt.xt_sid = tp->t_session->s_sid;
3054 error = SYSCTL_OUT(req, &xt, sizeof xt);
3059 mtx_lock(&tty_list_mutex);
3060 tp2 = TAILQ_NEXT(tp, t_list);
3063 mtx_unlock(&tty_list_mutex);
3070 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
3071 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys");
3072 SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD,
3073 &tk_nin, 0, "Total TTY in characters");
3074 SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD,
3075 &tk_nout, 0, "Total TTY out characters");
3078 nottystop(struct tty *tp, int rw)
3085 ttyopen(struct cdev *dev, int flag, int mode, struct thread *td)
3094 * We jump to this label after all non-interrupted sleeps to pick
3095 * up any changes of the device state.
3098 if (tp->t_state & TS_GONE)
3100 error = ttydtrwaitsleep(tp);
3103 if (tp->t_state & TS_ISOPEN) {
3105 * The device is open, so everything has been initialized.
3108 if (ISCALLOUT(dev) && !tp->t_actout)
3110 if (tp->t_actout && !ISCALLOUT(dev)) {
3111 if (flag & O_NONBLOCK)
3113 error = tsleep(&tp->t_actout,
3114 TTIPRI | PCATCH, "siobi", 0);
3115 if (error != 0 || (tp->t_flags & TS_GONE))
3119 if (tp->t_state & TS_XCLUDE && suser(td))
3123 * The device isn't open, so there are no conflicts.
3124 * Initialize it. Initialization is done twice in many
3125 * cases: to preempt sleeping callin opens if we are
3126 * callout, and to complete a callin open after DCD rises.
3128 tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in;
3129 tp->t_modem(tp, SER_DTR | SER_RTS, 0);
3131 error = tp->t_param(tp, &tp->t_termios);
3133 if (error == 0 && tp->t_open != NULL)
3134 error = tp->t_open(tp, dev);
3137 if (ISCALLOUT(dev) || (tp->t_modem(tp, 0, 0) & SER_DCD))
3141 * Wait for DCD if necessary.
3143 if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev)
3144 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
3146 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0);
3148 if (error != 0 || (tp->t_state & TS_GONE))
3152 error = ttyld_open(tp, dev);
3154 if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev))
3155 tp->t_actout = TRUE;
3158 if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0)
3164 ttyclose(struct cdev *dev, int flag, int mode, struct thread *td)
3169 ttyld_close(tp, flag);
3173 tp->t_do_timestamp = 0;
3174 if (tp->t_pps != NULL)
3175 tp->t_pps->ppsparam.mode = 0;
3180 ttyread(struct cdev *dev, struct uio *uio, int flag)
3184 tp = tty_gettp(dev);
3186 if (tp->t_state & TS_GONE)
3188 return (ttyld_read(tp, uio, flag));
3192 ttywrite(struct cdev *dev, struct uio *uio, int flag)
3196 tp = tty_gettp(dev);
3198 if (tp->t_state & TS_GONE)
3200 return (ttyld_write(tp, uio, flag));
3204 ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
3210 error = ttyld_ioctl(tp, cmd, data, flag, td);
3211 if (error == ENOIOCTL)
3212 error = ttioctl(tp, cmd, data, flag);
3214 if (error != ENOIOCTL)
3220 ttyldoptim(struct tty *tp)
3225 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
3226 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
3227 && (!(t->c_iflag & PARMRK)
3228 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
3229 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
3230 && linesw[tp->t_line]->l_rint == ttyinput)
3231 tp->t_state |= TS_CAN_BYPASS_L_RINT;
3233 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
3237 ttydtrwaitwakeup(void *arg)
3242 tp->t_state &= ~TS_DTR_WAIT;
3243 wakeup(&tp->t_dtr_wait);
3248 ttydtrwaitstart(struct tty *tp)
3251 if (tp->t_dtr_wait == 0)
3253 if (tp->t_state & TS_DTR_WAIT)
3255 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait);
3256 tp->t_state |= TS_DTR_WAIT;
3260 ttydtrwaitsleep(struct tty *tp)
3265 while (error == 0) {
3266 if (tp->t_state & TS_GONE)
3268 else if (!(tp->t_state & TS_DTR_WAIT))
3271 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH,
3278 ttysopen(struct cdev *dev, int flag, int mode, struct thread *td)
3284 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev)));
3285 if (tp->t_state & TS_GONE)
3291 ttysclose(struct cdev *dev, int flag, int mode, struct thread *td)
3298 ttysrdwr(struct cdev *dev, struct uio *uio, int flag)
3305 ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
3313 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev)));
3314 if (tp->t_state & TS_GONE)
3322 *ct = *(struct termios *)data;
3325 *(struct termios *)data = *ct;
3328 *(int *)data = TTYDISC;
3331 bzero(data, sizeof(struct winsize));
3334 if (tp->t_cioctl != NULL)
3335 return(tp->t_cioctl(dev, cmd, data, flag, td));
3341 * Use more "normal" termios paramters for consoles.
3344 ttyconsolemode(struct tty *tp, int speed)
3347 tp->t_init_in.c_iflag = TTYDEF_IFLAG;
3348 tp->t_init_in.c_oflag = TTYDEF_OFLAG;
3349 tp->t_init_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
3350 tp->t_init_in.c_lflag = TTYDEF_LFLAG | ECHO | ECHOE | ECHOKE | ECHOCTL;
3351 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL;
3353 speed = TTYDEF_SPEED;
3354 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed =
3355 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed =
3356 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed;
3357 tp->t_init_out = tp->t_init_in;
3361 * Record the relationship between the serial ports notion of modem control
3362 * signals and the one used in certain ioctls in a way the compiler can enforce
3363 * XXX: We should define TIOCM_* in terms of SER_ if we can limit the
3364 * XXX: consequences of the #include work that would take.
3366 CTASSERT(SER_DTR == TIOCM_DTR / 2);
3367 CTASSERT(SER_RTS == TIOCM_RTS / 2);
3368 CTASSERT(SER_STX == TIOCM_ST / 2);
3369 CTASSERT(SER_SRX == TIOCM_SR / 2);
3370 CTASSERT(SER_CTS == TIOCM_CTS / 2);
3371 CTASSERT(SER_DCD == TIOCM_DCD / 2);
3372 CTASSERT(SER_RI == TIOCM_RI / 2);
3373 CTASSERT(SER_DSR == TIOCM_DSR / 2);