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.
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
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33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.44 2008/01/15 14:19:11 hasso Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
83 #include <sys/clist.h>
85 #include <sys/fcntl.h>
87 #include <sys/dkstat.h>
89 #include <sys/kernel.h>
90 #include <sys/vnode.h>
91 #include <sys/signalvar.h>
92 #include <sys/signal2.h>
93 #include <sys/resourcevar.h>
94 #include <sys/malloc.h>
95 #include <sys/filedesc.h>
96 #include <sys/sysctl.h>
97 #include <sys/thread2.h>
100 #include <sys/lock.h>
102 #include <vm/vm_map.h>
104 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
106 static int proc_compare (struct proc *p1, struct proc *p2);
107 static int ttnread (struct tty *tp);
108 static void ttyecho (int c, struct tty *tp);
109 static int ttyoutput (int c, struct tty *tp);
110 static void ttypend (struct tty *tp);
111 static void ttyretype (struct tty *tp);
112 static void ttyrub (int c, struct tty *tp);
113 static void ttyrubo (struct tty *tp, int cnt);
114 static void ttyunblock (struct tty *tp);
115 static int ttywflush (struct tty *tp);
116 static int filt_ttyread (struct knote *kn, long hint);
117 static void filt_ttyrdetach (struct knote *kn);
118 static int filt_ttywrite (struct knote *kn, long hint);
119 static void filt_ttywdetach (struct knote *kn);
122 * Table with character classes and parity. The 8th bit indicates parity,
123 * the 7th bit indicates the character is an alphameric or underscore (for
124 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
125 * are 0 then the character needs no special processing on output; classes
126 * other than 0 might be translated or (not currently) require delays.
128 #define E 0x00 /* Even parity. */
129 #define O 0x80 /* Odd parity. */
130 #define PARITY(c) (char_type[c] & O)
132 #define ALPHA 0x40 /* Alpha or underscore. */
133 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
135 #define CCLASSMASK 0x3f
136 #define CCLASS(c) (char_type[c] & CCLASSMASK)
141 #define NA ORDINARY | ALPHA
147 static u_char const char_type[] = {
148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
149 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
150 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
151 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
152 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
153 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
155 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
156 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
159 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
160 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
163 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
165 * Meta chars; should be settable per character set;
166 * for now, treat them all as normal characters.
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
183 NA, NA, NA, NA, NA, NA, NA, NA,
194 /* Macros to clear/set/test flags. */
195 #define SET(t, f) (t) |= (f)
196 #define CLR(t, f) (t) &= ~(f)
197 #define ISSET(t, f) ((t) & (f))
199 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
200 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
203 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
204 "LU", "TTY input statistic");
206 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
207 "LU", "TTY output statistic");
211 * list of struct tty where pstat(8) can pick it up with sysctl
213 static SLIST_HEAD(, tty) tty_list;
216 * Initial open of tty, or (re)entry to standard tty line discipline.
219 ttyopen(cdev_t device, struct tty *tp)
223 if (!ISSET(tp->t_state, TS_ISOPEN)) {
224 SET(tp->t_state, TS_ISOPEN);
225 if (ISSET(tp->t_cflag, CLOCAL))
226 SET(tp->t_state, TS_CONNECTED);
227 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
235 * Handle close() on a tty line: flush and set to initial state,
236 * bumping generation number so that pending read/write calls
237 * can detect recycling of the tty.
239 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
240 * and l_close() should have flushed, but we repeat the spltty() and
241 * the flush in case there are buggy callers.
244 ttyclose(struct tty *tp)
246 funsetown(tp->t_sigio);
251 ttyflush(tp, FREAD | FWRITE);
252 clist_free_cblocks(&tp->t_canq);
253 clist_free_cblocks(&tp->t_outq);
254 clist_free_cblocks(&tp->t_rawq);
257 tp->t_line = TTYDISC;
265 * Disassociate the tty from its session. Traditionally this has only been
266 * a half-close, meaning that the session was still allowed to point at the
267 * tty (resulting in the tty in the ps command showing something like 'p0-'),
268 * even though the tty is no longer pointing at the session.
270 * The half close seems to be useful only for 'ps' output but there is as
271 * yet no reason to remove the feature. The full-close code is currently
272 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
275 ttyclearsession(struct tty *tp)
280 if ((sp = tp->t_session) != NULL) {
281 tp->t_session = NULL;
282 #ifdef TTY_DO_FULL_CLOSE
283 /* FULL CLOSE (not yet) */
284 if (sp->s_ttyp == tp) {
287 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
288 "%p/%p\n", sp->s_ttyp, tp);
295 * Release the tty vnode association for a session. This is the
296 * 'other half' of the close. Because multiple opens of /dev/tty
297 * only generate a single open to the actual tty, the file modes
298 * are locked to FREAD|FWRITE.
300 * If dorevoke is non-zero, the session is also revoked. We have to
301 * close the vnode if VCTTYISOPEN is set.
304 ttyclosesession(struct session *sp, int dorevoke)
310 * There may not be a controlling terminal or it may have been closed
313 if ((vp = sp->s_ttyvp) == NULL)
317 * We need a lock if we have to close or revoke.
319 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
321 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
327 * Retry if the vnode was ripped out from under us
329 if (vp != sp->s_ttyvp) {
336 * Close and revoke as needed
339 if (vp->v_flag & VCTTYISOPEN) {
340 vclrflags(vp, VCTTYISOPEN);
341 VOP_CLOSE(vp, FREAD|FWRITE);
344 VOP_REVOKE(vp, REVOKEALL);
353 #define FLUSHQ(q) { \
355 ndflush(q, (q)->c_cc); \
358 /* Is 'c' a line delimiter ("break" character)? */
359 #define TTBREAKC(c, lflag) \
360 ((c) == '\n' || (((c) == cc[VEOF] || \
361 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
362 (c) != _POSIX_VDISABLE))
365 * Process input of a single character received on a tty.
368 ttyinput(int c, struct tty *tp)
370 tcflag_t iflag, lflag;
375 * If input is pending take it first.
378 if (ISSET(lflag, PENDIN))
383 if (ISSET(lflag, ICANON))
390 * Block further input iff:
391 * current input > threshold AND input is available to user program
392 * AND input flow control is enabled and not yet invoked.
393 * The 3 is slop for PARMRK.
396 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
397 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
398 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
399 !ISSET(tp->t_state, TS_TBLOCK))
402 /* Handle exceptional conditions (break, parity, framing). */
404 err = (ISSET(c, TTY_ERRORMASK));
406 CLR(c, TTY_ERRORMASK);
407 if (ISSET(err, TTY_BI)) {
408 if (ISSET(iflag, IGNBRK))
410 if (ISSET(iflag, BRKINT)) {
411 ttyflush(tp, FREAD | FWRITE);
412 pgsignal(tp->t_pgrp, SIGINT, 1);
415 if (ISSET(iflag, PARMRK))
417 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
418 || ISSET(err, TTY_FE)) {
419 if (ISSET(iflag, IGNPAR))
421 else if (ISSET(iflag, PARMRK)) {
423 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
426 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
427 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
428 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
435 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
437 if (!ISSET(lflag, EXTPROC)) {
439 * Check for literal nexting very first
441 if (ISSET(tp->t_state, TS_LNCH)) {
443 CLR(tp->t_state, TS_LNCH);
446 * Scan for special characters. This code
447 * is really just a big case statement with
448 * non-constant cases. The bottom of the
449 * case statement is labeled ``endcase'', so goto
450 * it after a case match, or similar.
454 * Control chars which aren't controlled
455 * by ICANON, ISIG, or IXON.
457 if (ISSET(lflag, IEXTEN)) {
458 if (CCEQ(cc[VLNEXT], c)) {
459 if (ISSET(lflag, ECHO)) {
460 if (ISSET(lflag, ECHOE)) {
461 (void)ttyoutput('^', tp);
462 (void)ttyoutput('\b', tp);
466 SET(tp->t_state, TS_LNCH);
469 if (CCEQ(cc[VDISCARD], c)) {
470 if (ISSET(lflag, FLUSHO))
471 CLR(tp->t_lflag, FLUSHO);
473 ttyflush(tp, FWRITE);
475 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
477 SET(tp->t_lflag, FLUSHO);
485 if (ISSET(lflag, ISIG)) {
486 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
487 if (!ISSET(lflag, NOFLSH))
488 ttyflush(tp, FREAD | FWRITE);
491 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
494 if (CCEQ(cc[VSUSP], c)) {
495 if (!ISSET(lflag, NOFLSH))
498 pgsignal(tp->t_pgrp, SIGTSTP, 1);
503 * Handle start/stop characters.
505 if (ISSET(iflag, IXON)) {
506 if (CCEQ(cc[VSTOP], c)) {
507 if (!ISSET(tp->t_state, TS_TTSTOP)) {
508 SET(tp->t_state, TS_TTSTOP);
509 (*tp->t_stop)(tp, 0);
512 if (!CCEQ(cc[VSTART], c))
515 * if VSTART == VSTOP then toggle
519 if (CCEQ(cc[VSTART], c))
523 * IGNCR, ICRNL, & INLCR
526 if (ISSET(iflag, IGNCR))
528 else if (ISSET(iflag, ICRNL))
530 } else if (c == '\n' && ISSET(iflag, INLCR))
533 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
535 * From here on down canonical mode character
536 * processing takes place.
539 * erase or erase2 (^H / ^?)
541 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
543 ttyrub(clist_unputc(&tp->t_rawq), tp);
549 if (CCEQ(cc[VKILL], c)) {
550 if (ISSET(lflag, ECHOKE) &&
551 tp->t_rawq.c_cc == tp->t_rocount &&
552 !ISSET(lflag, ECHOPRT))
553 while (tp->t_rawq.c_cc)
554 ttyrub(clist_unputc(&tp->t_rawq), tp);
557 if (ISSET(lflag, ECHOK) ||
558 ISSET(lflag, ECHOKE))
563 CLR(tp->t_state, TS_LOCAL);
569 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
575 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
580 * erase last char of word and remember the
581 * next chars type (for ALTWERASE)
584 c = clist_unputc(&tp->t_rawq);
587 if (c == ' ' || c == '\t') {
588 clist_putc(c, &tp->t_rawq);
597 c = clist_unputc(&tp->t_rawq);
600 } while (c != ' ' && c != '\t' &&
601 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
602 clist_putc(c, &tp->t_rawq);
608 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
613 * ^T - kernel info and generate SIGINFO
615 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
616 if (ISSET(lflag, ISIG))
617 pgsignal(tp->t_pgrp, SIGINFO, 1);
618 if (!ISSET(lflag, NOKERNINFO))
622 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
623 if (ISSET(lflag, ISIG))
624 pgsignal(tp->t_pgrp, SIGCKPT, 1);
629 * Check for input buffer overflow
631 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
633 if (ISSET(iflag, IMAXBEL)) {
634 if (tp->t_outq.c_cc < tp->t_ohiwat)
635 (void)ttyoutput(CTRL('g'), tp);
640 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
641 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
642 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
645 * Put data char in q for user and
646 * wakeup on seeing a line delimiter.
648 if (clist_putc(c, &tp->t_rawq) >= 0) {
649 if (!ISSET(lflag, ICANON)) {
654 if (TTBREAKC(c, lflag)) {
656 catq(&tp->t_rawq, &tp->t_canq);
658 } else if (tp->t_rocount++ == 0)
659 tp->t_rocol = tp->t_column;
660 if (ISSET(tp->t_state, TS_ERASE)) {
662 * end of prterase \.../
664 CLR(tp->t_state, TS_ERASE);
665 (void)ttyoutput('/', tp);
669 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
671 * Place the cursor over the '^' of the ^D.
673 i = imin(2, tp->t_column - i);
675 (void)ttyoutput('\b', tp);
682 * IXANY means allow any character to restart output.
684 if (ISSET(tp->t_state, TS_TTSTOP) &&
685 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
688 CLR(tp->t_lflag, FLUSHO);
689 CLR(tp->t_state, TS_TTSTOP);
691 return (ttstart(tp));
695 * Output a single character on a tty, doing output processing
696 * as needed (expanding tabs, newline processing, etc.).
697 * Returns < 0 if succeeds, otherwise returns char to resend.
701 ttyoutput(int c, struct tty *tp)
707 if (!ISSET(oflag, OPOST)) {
708 if (ISSET(tp->t_lflag, FLUSHO))
710 if (clist_putc(c, &tp->t_outq))
717 * Do tab expansion if OXTABS is set. Special case if we external
718 * processing, we don't do the tab expansion because we'll probably
719 * get it wrong. If tab expansion needs to be done, let it happen
722 CLR(c, ~TTY_CHARMASK);
724 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
725 c = 8 - (tp->t_column & 7);
726 if (!ISSET(tp->t_lflag, FLUSHO)) {
727 crit_enter(); /* Don't interrupt tabs. */
728 c -= b_to_q(" ", c, &tp->t_outq);
734 return (c ? -1 : '\t');
736 if (c == CEOT && ISSET(oflag, ONOEOT))
740 * Newline translation: if ONLCR is set,
741 * translate newline into "\r\n".
743 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
746 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
749 /* If OCRNL is set, translate "\r" into "\n". */
750 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
752 /* If ONOCR is set, don't transmit CRs when on column 0. */
753 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
758 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
770 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
780 col = (col + 8) & ~7;
788 * Ioctls for all tty devices. Called after line-discipline specific ioctl
789 * has been called to do discipline-specific functions and/or reject any
790 * of these ioctl commands.
794 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
796 struct thread *td = curthread;
797 struct lwp *lp = td->td_lwp;
798 struct proc *p = td->td_proc;
803 /* If the ioctl involves modification, hang if in the background. */
827 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
837 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
838 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
839 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
840 if (p->p_pgrp->pg_jobc == 0)
842 pgsignal(p->p_pgrp, SIGTTOU, 1);
843 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
851 switch (cmd) { /* Process the ioctl. */
852 case FIOASYNC: /* set/clear async i/o */
855 SET(tp->t_state, TS_ASYNC);
857 CLR(tp->t_state, TS_ASYNC);
860 case FIONREAD: /* get # bytes to read */
862 *(int *)data = ttnread(tp);
868 * Policy -- Don't allow FIOSETOWN on someone else's
871 if (tp->t_session != NULL && !isctty(p, tp))
874 error = fsetown(*(int *)data, &tp->t_sigio);
879 if (tp->t_session != NULL && !isctty(p, tp))
881 *(int *)data = fgetown(tp->t_sigio);
884 case TIOCEXCL: /* set exclusive use of tty */
886 SET(tp->t_state, TS_XCLUDE);
889 case TIOCFLUSH: { /* flush buffers */
890 int flags = *(int *)data;
893 flags = FREAD | FWRITE;
895 flags &= FREAD | FWRITE;
899 case TIOCCONS: /* become virtual console */
901 if (constty && constty != tp &&
902 ISSET(constty->t_state, TS_CONNECTED))
905 if ((error = suser(td)) != 0)
909 } else if (tp == constty)
912 case TIOCDRAIN: /* wait till output drained */
917 case TIOCGETA: { /* get termios struct */
918 struct termios *t = (struct termios *)data;
920 bcopy(&tp->t_termios, t, sizeof(struct termios));
923 case TIOCGETD: /* get line discipline */
924 *(int *)data = tp->t_line;
926 case TIOCGWINSZ: /* get window size */
927 *(struct winsize *)data = tp->t_winsize;
929 case TIOCGPGRP: /* get pgrp of tty */
932 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
935 case TIOCHPCL: /* hang up on last close */
937 SET(tp->t_cflag, HUPCL);
941 case TIOCNXCL: /* reset exclusive use of tty */
943 CLR(tp->t_state, TS_XCLUDE);
946 case TIOCOUTQ: /* output queue size */
947 *(int *)data = tp->t_outq.c_cc;
949 case TIOCSETA: /* set termios struct */
950 case TIOCSETAW: /* drain output, set */
951 case TIOCSETAF: { /* drn out, fls in, set */
952 struct termios *t = (struct termios *)data;
954 if (t->c_ispeed == 0)
955 t->c_ispeed = t->c_ospeed;
956 if (t->c_ispeed == 0)
957 t->c_ispeed = tp->t_ospeed;
958 if (t->c_ispeed == 0)
961 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
967 if (cmd == TIOCSETAF)
970 if (!ISSET(t->c_cflag, CIGNORE)) {
972 * Set device hardware.
974 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
978 if (ISSET(t->c_cflag, CLOCAL) &&
979 !ISSET(tp->t_cflag, CLOCAL)) {
981 * XXX disconnections would be too hard to
982 * get rid of without this kludge. The only
983 * way to get rid of controlling terminals
984 * is to exit from the session leader.
986 CLR(tp->t_state, TS_ZOMBIE);
988 wakeup(TSA_CARR_ON(tp));
992 if ((ISSET(tp->t_state, TS_CARR_ON) ||
993 ISSET(t->c_cflag, CLOCAL)) &&
994 !ISSET(tp->t_state, TS_ZOMBIE))
995 SET(tp->t_state, TS_CONNECTED);
997 CLR(tp->t_state, TS_CONNECTED);
998 tp->t_cflag = t->c_cflag;
999 tp->t_ispeed = t->c_ispeed;
1000 if (t->c_ospeed != 0)
1001 tp->t_ospeed = t->c_ospeed;
1004 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1006 if (ISSET(t->c_lflag, ICANON))
1007 SET(tp->t_lflag, PENDIN);
1010 * XXX we really shouldn't allow toggling
1011 * ICANON while we're in a non-termios line
1012 * discipline. Now we have to worry about
1013 * panicing for a null queue.
1015 if (tp->t_canq.c_cbreserved > 0 &&
1016 tp->t_rawq.c_cbreserved > 0) {
1017 catq(&tp->t_rawq, &tp->t_canq);
1019 * XXX the queue limits may be
1020 * different, so the old queue
1021 * swapping method no longer works.
1023 catq(&tp->t_canq, &tp->t_rawq);
1025 CLR(tp->t_lflag, PENDIN);
1029 tp->t_iflag = t->c_iflag;
1030 tp->t_oflag = t->c_oflag;
1032 * Make the EXTPROC bit read only.
1034 if (ISSET(tp->t_lflag, EXTPROC))
1035 SET(t->c_lflag, EXTPROC);
1037 CLR(t->c_lflag, EXTPROC);
1038 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1039 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1040 t->c_cc[VTIME] != tp->t_cc[VTIME])
1042 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1046 case TIOCSETD: { /* set line discipline */
1047 int t = *(int *)data;
1048 cdev_t device = tp->t_dev;
1050 if ((u_int)t >= nlinesw)
1052 if (t != tp->t_line) {
1054 (*linesw[tp->t_line].l_close)(tp, flag);
1055 error = (*linesw[t].l_open)(device, tp);
1057 (void)(*linesw[tp->t_line].l_open)(device, tp);
1066 case TIOCSTART: /* start output, like ^Q */
1068 if (ISSET(tp->t_state, TS_TTSTOP) ||
1069 ISSET(tp->t_lflag, FLUSHO)) {
1070 CLR(tp->t_lflag, FLUSHO);
1071 CLR(tp->t_state, TS_TTSTOP);
1076 case TIOCSTI: /* simulate terminal input */
1077 if ((flag & FREAD) == 0 && suser(td))
1079 if (!isctty(p, tp) && suser(td))
1082 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1085 case TIOCSTOP: /* stop output, like ^S */
1087 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1088 SET(tp->t_state, TS_TTSTOP);
1089 (*tp->t_stop)(tp, 0);
1093 case TIOCSCTTY: /* become controlling tty */
1094 /* Session ctty vnode pointer set in vnode layer. */
1095 if (!SESS_LEADER(p) ||
1096 ((p->p_session->s_ttyvp || tp->t_session) &&
1097 (tp->t_session != p->p_session)))
1099 tp->t_session = p->p_session;
1100 tp->t_pgrp = p->p_pgrp;
1101 p->p_session->s_ttyp = tp;
1102 p->p_flag |= P_CONTROLT;
1104 case TIOCSPGRP: { /* set pgrp of tty */
1105 struct pgrp *pgrp = pgfind(*(int *)data);
1109 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1114 case TIOCSTAT: /* simulate control-T */
1119 case TIOCSWINSZ: /* set window size */
1120 if (bcmp((caddr_t)&tp->t_winsize, data,
1121 sizeof (struct winsize))) {
1122 tp->t_winsize = *(struct winsize *)data;
1123 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1126 case TIOCSDRAINWAIT:
1130 tp->t_timeout = *(int *)data * hz;
1131 wakeup(TSA_OCOMPLETE(tp));
1132 wakeup(TSA_OLOWAT(tp));
1134 case TIOCGDRAINWAIT:
1135 *(int *)data = tp->t_timeout / hz;
1138 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1139 return (ttcompat(tp, cmd, data, flag));
1148 ttypoll(struct dev_poll_args *ap)
1150 cdev_t dev = ap->a_head.a_dev;
1151 int events = ap->a_events;
1156 /* XXX used to return ENXIO, but that means true! */
1158 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1159 POLLWRNORM)) | POLLHUP;
1164 if (events & (POLLIN | POLLRDNORM)) {
1165 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1166 revents |= events & (POLLIN | POLLRDNORM);
1168 selrecord(curthread, &tp->t_rsel);
1170 if (events & (POLLOUT | POLLWRNORM)) {
1171 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1172 ISSET(tp->t_state, TS_CONNECTED))
1173 || ISSET(tp->t_state, TS_ZOMBIE))
1174 revents |= events & (POLLOUT | POLLWRNORM);
1176 selrecord(curthread, &tp->t_wsel);
1179 ap->a_events = revents;
1183 static struct filterops ttyread_filtops =
1184 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1185 static struct filterops ttywrite_filtops =
1186 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1189 ttykqfilter(struct dev_kqfilter_args *ap)
1191 cdev_t dev = ap->a_head.a_dev;
1192 struct knote *kn = ap->a_kn;
1193 struct tty *tp = dev->si_tty;
1194 struct klist *klist;
1197 switch (kn->kn_filter) {
1199 klist = &tp->t_rsel.si_note;
1200 kn->kn_fop = &ttyread_filtops;
1203 klist = &tp->t_wsel.si_note;
1204 kn->kn_fop = &ttywrite_filtops;
1211 kn->kn_hook = (caddr_t)dev;
1214 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1221 filt_ttyrdetach(struct knote *kn)
1223 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1226 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1231 filt_ttyread(struct knote *kn, long hint)
1233 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1235 kn->kn_data = ttnread(tp);
1236 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1237 kn->kn_flags |= EV_EOF;
1240 return (kn->kn_data > 0);
1244 filt_ttywdetach(struct knote *kn)
1246 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1249 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1254 filt_ttywrite(struct knote *kn, long hint)
1256 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1258 kn->kn_data = tp->t_outq.c_cc;
1259 if (ISSET(tp->t_state, TS_ZOMBIE))
1261 return (kn->kn_data <= tp->t_olowat &&
1262 ISSET(tp->t_state, TS_CONNECTED));
1266 * Must be called while in a critical section.
1269 ttnread(struct tty *tp)
1273 if (ISSET(tp->t_lflag, PENDIN))
1275 nread = tp->t_canq.c_cc;
1276 if (!ISSET(tp->t_lflag, ICANON)) {
1277 nread += tp->t_rawq.c_cc;
1278 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1285 * Wait for output to drain.
1288 ttywait(struct tty *tp)
1294 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1295 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1297 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1298 ISSET(tp->t_state, TS_CONNECTED)) {
1299 SET(tp->t_state, TS_SO_OCOMPLETE);
1300 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1304 if (error == EWOULDBLOCK)
1311 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1318 * Flush if successfully wait.
1321 ttywflush(struct tty *tp)
1325 if ((error = ttywait(tp)) == 0)
1326 ttyflush(tp, FREAD);
1331 * Flush tty read and/or write queues, notifying anyone waiting.
1334 ttyflush(struct tty *tp, int rw)
1341 FLUSHQ(&tp->t_outq);
1342 CLR(tp->t_state, TS_TTSTOP);
1344 (*tp->t_stop)(tp, rw);
1346 FLUSHQ(&tp->t_canq);
1347 FLUSHQ(&tp->t_rawq);
1348 CLR(tp->t_lflag, PENDIN);
1351 CLR(tp->t_state, TS_LOCAL);
1353 if (ISSET(tp->t_state, TS_TBLOCK)) {
1355 FLUSHQ(&tp->t_outq);
1359 * Don't let leave any state that might clobber the
1360 * next line discipline (although we should do more
1361 * to send the START char). Not clearing the state
1362 * may have caused the "putc to a clist with no
1363 * reserved cblocks" panic/kprintf.
1365 CLR(tp->t_state, TS_TBLOCK);
1367 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1368 if (ISSET(tp->t_iflag, IXOFF)) {
1370 * XXX wait a bit in the hope that the stop
1371 * character (if any) will go out. Waiting
1372 * isn't good since it allows races. This
1373 * will be fixed when the stop character is
1374 * put in a special queue. Don't bother with
1375 * the checks in ttywait() since the timeout
1378 SET(tp->t_state, TS_SO_OCOMPLETE);
1379 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1382 * Don't try sending the stop character again.
1384 CLR(tp->t_state, TS_TBLOCK);
1391 FLUSHQ(&tp->t_outq);
1398 * Copy in the default termios characters.
1401 termioschars(struct termios *t)
1404 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1411 ttychars(struct tty *tp)
1414 termioschars(&tp->t_termios);
1418 * Handle input high water. Send stop character for the IXOFF case. Turn
1419 * on our input flow control bit and propagate the changes to the driver.
1420 * XXX the stop character should be put in a special high priority queue.
1423 ttyblock(struct tty *tp)
1426 SET(tp->t_state, TS_TBLOCK);
1427 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1428 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1429 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1434 * Handle input low water. Send start character for the IXOFF case. Turn
1435 * off our input flow control bit and propagate the changes to the driver.
1436 * XXX the start character should be put in a special high priority queue.
1439 ttyunblock(struct tty *tp)
1442 CLR(tp->t_state, TS_TBLOCK);
1443 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1444 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1445 SET(tp->t_state, TS_TBLOCK); /* try again later */
1450 /* Not used by any current (i386) drivers. */
1452 * Restart after an inter-char delay.
1455 ttrstrt(void *tp_arg)
1459 KASSERT(tp_arg != NULL, ("ttrstrt"));
1463 CLR(tp->t_state, TS_TIMEOUT);
1470 ttstart(struct tty *tp)
1473 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1479 * "close" a line discipline
1482 ttylclose(struct tty *tp, int flag)
1485 if (flag & FNONBLOCK || ttywflush(tp))
1486 ttyflush(tp, FREAD | FWRITE);
1491 * Handle modem control transition on a tty.
1492 * Flag indicates new state of carrier.
1493 * Returns 0 if the line should be turned off, otherwise 1.
1496 ttymodem(struct tty *tp, int flag)
1499 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1501 * MDMBUF: do flow control according to carrier flag
1502 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1503 * works if IXON and IXANY are clear.
1506 CLR(tp->t_state, TS_CAR_OFLOW);
1507 CLR(tp->t_state, TS_TTSTOP);
1509 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1510 SET(tp->t_state, TS_CAR_OFLOW);
1511 SET(tp->t_state, TS_TTSTOP);
1512 (*tp->t_stop)(tp, 0);
1514 } else if (flag == 0) {
1518 CLR(tp->t_state, TS_CARR_ON);
1519 if (ISSET(tp->t_state, TS_ISOPEN) &&
1520 !ISSET(tp->t_cflag, CLOCAL)) {
1521 SET(tp->t_state, TS_ZOMBIE);
1522 CLR(tp->t_state, TS_CONNECTED);
1523 if (tp->t_session && tp->t_session->s_leader)
1524 ksignal(tp->t_session->s_leader, SIGHUP);
1525 ttyflush(tp, FREAD | FWRITE);
1532 SET(tp->t_state, TS_CARR_ON);
1533 if (!ISSET(tp->t_state, TS_ZOMBIE))
1534 SET(tp->t_state, TS_CONNECTED);
1535 wakeup(TSA_CARR_ON(tp));
1543 * Reinput pending characters after state switch
1544 * call from a critical section.
1547 ttypend(struct tty *tp)
1552 CLR(tp->t_lflag, PENDIN);
1553 SET(tp->t_state, TS_TYPEN);
1555 * XXX this assumes too much about clist internals. It may even
1556 * fail if the cblock slush pool is empty. We can't allocate more
1557 * cblocks here because we are called from an interrupt handler
1558 * and clist_alloc_cblocks() can wait.
1561 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1562 tp->t_rawq.c_cbmax = tq.c_cbmax;
1563 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1564 while ((c = clist_getc(&tq)) >= 0)
1566 CLR(tp->t_state, TS_TYPEN);
1570 * Process a read call on a tty device.
1573 ttread(struct tty *tp, struct uio *uio, int flag)
1578 cc_t *cc = tp->t_cc;
1581 int first, error = 0;
1582 int has_stime = 0, last_cc = 0;
1583 long slp = 0; /* XXX this should be renamed `timo'. */
1584 struct timeval stime;
1586 lp = curthread->td_lwp;
1590 lflag = tp->t_lflag;
1592 * take pending input first
1594 if (ISSET(lflag, PENDIN)) {
1596 splz(); /* reduce latency */
1597 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1601 * Hang process if it's in the background.
1603 if ((pp = curproc) && isbackground(pp, tp)) {
1605 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1606 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1607 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1609 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1610 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1616 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1618 return (0); /* EOF */
1622 * If canonical, use the canonical queue,
1623 * else use the raw queue.
1625 * (should get rid of clists...)
1627 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1629 if (flag & IO_NDELAY) {
1632 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1637 return (EWOULDBLOCK);
1639 if (!ISSET(lflag, ICANON)) {
1642 struct timeval timecopy;
1645 * Check each of the four combinations.
1646 * (m > 0 && t == 0) is the normal read case.
1647 * It should be fairly efficient, so we check that and its
1648 * companion case (m == 0 && t == 0) first.
1649 * For the other two cases, we compute the target sleep time
1658 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1662 t *= 100000; /* time in us */
1663 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1664 ((t1).tv_usec - (t2).tv_usec))
1670 getmicrotime(&timecopy);
1672 /* first character, start timer */
1676 } else if (qp->c_cc > last_cc) {
1677 /* got a character, restart timer */
1681 /* nothing, check expiration */
1682 slp = t - diff(timecopy, stime);
1687 } else { /* m == 0 */
1690 getmicrotime(&timecopy);
1696 slp = t - diff(timecopy, stime);
1698 /* Timed out, but 0 is enough input. */
1706 * Rounding down may make us wake up just short
1707 * of the target, so we round up.
1708 * The formula is ceiling(slp * hz/1000000).
1709 * 32-bit arithmetic is enough for hz < 169.
1710 * XXX see tvtohz() for how to avoid overflow if hz
1711 * is large (divide by `tick' and/or arrange to
1712 * use tvtohz() if hz is large).
1714 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1717 if (qp->c_cc <= 0) {
1720 * There is no input, or not enough input and we can block.
1722 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1723 ISSET(tp->t_state, TS_CONNECTED) ?
1724 "ttyin" : "ttyhup", (int)slp);
1726 if (error == EWOULDBLOCK)
1731 * XXX what happens if another process eats some input
1732 * while we are asleep (not just here)? It would be
1733 * safest to detect changes and reset our state variables
1734 * (has_stime and last_cc).
1742 * Input present, check for input mapping and processing.
1745 if (ISSET(lflag, ICANON | ISIG))
1751 icc = imin(uio->uio_resid, IBUFSIZ);
1752 icc = q_to_b(qp, ibuf, icc);
1758 error = uiomove(ibuf, icc, uio);
1760 * XXX if there was an error then we should ungetc() the
1761 * unmoved chars and reduce icc here.
1765 if (uio->uio_resid == 0)
1779 * delayed suspend (^Y)
1781 if (CCEQ(cc[VDSUSP], c) &&
1782 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1783 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1785 error = ttysleep(tp, &lbolt, PCATCH,
1794 * Interpret EOF only in canonical mode.
1796 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1799 * Give user character.
1801 error = ureadc(c, uio);
1803 /* XXX should ungetc(c, qp). */
1805 if (uio->uio_resid == 0)
1808 * In canonical mode check for a "break character"
1809 * marking the end of a "line of input".
1811 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1818 * Look to unblock input now that (presumably)
1819 * the input queue has gone down.
1822 if (ISSET(tp->t_state, TS_TBLOCK) &&
1823 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1831 * Check the output queue on tp for space for a kernel message (from uprintf
1832 * or tprintf). Allow some space over the normal hiwater mark so we don't
1833 * lose messages due to normal flow control, but don't let the tty run amok.
1834 * Sleeps here are not interruptible, but we return prematurely if new signals
1838 ttycheckoutq(struct tty *tp, int wait)
1840 struct lwp *lp = curthread->td_lwp;
1842 sigset_t oldset, newset;
1844 hiwat = tp->t_ohiwat;
1845 SIGEMPTYSET(oldset);
1846 SIGEMPTYSET(newset);
1849 oldset = lwp_sigpend(lp);
1850 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1851 while (tp->t_outq.c_cc > hiwat) {
1853 if (tp->t_outq.c_cc <= hiwat)
1856 newset = lwp_sigpend(lp);
1857 if (!wait || SIGSETNEQ(oldset, newset)) {
1861 SET(tp->t_state, TS_SO_OLOWAT);
1862 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1870 * Process a write call on a tty device.
1873 ttwrite(struct tty *tp, struct uio *uio, int flag)
1879 int i, hiwat, cnt, error;
1882 lp = curthread->td_lwp;
1883 hiwat = tp->t_ohiwat;
1884 cnt = uio->uio_resid;
1889 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1891 if (uio->uio_resid == cnt)
1895 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1896 if (flag & IO_NDELAY) {
1898 error = EWOULDBLOCK;
1901 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1910 * Hang the process if it's in the background.
1912 if ((pp = curproc) && isbackground(pp, tp) &&
1913 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1914 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1915 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1916 if (pp->p_pgrp->pg_jobc == 0) {
1920 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1921 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1927 * Process the user's data in at most OBUFSIZ chunks. Perform any
1928 * output translation. Keep track of high water mark, sleep on
1929 * overflow awaiting device aid in acquiring new space.
1931 while (uio->uio_resid > 0 || cc > 0) {
1932 if (ISSET(tp->t_lflag, FLUSHO)) {
1936 if (tp->t_outq.c_cc > hiwat)
1939 * Grab a hunk of data from the user, unless we have some
1940 * leftover from last time.
1943 cc = imin(uio->uio_resid, OBUFSIZ);
1945 error = uiomove(cp, cc, uio);
1952 * If nothing fancy need be done, grab those characters we
1953 * can handle without any of ttyoutput's processing and
1954 * just transfer them to the output q. For those chars
1955 * which require special processing (as indicated by the
1956 * bits in char_type), call ttyoutput. After processing
1957 * a hunk of data, look for FLUSHO so ^O's will take effect
1961 if (!ISSET(tp->t_oflag, OPOST))
1964 ce = cc - scanc((u_int)cc, (u_char *)cp,
1965 char_type, CCLASSMASK);
1967 * If ce is zero, then we're processing
1968 * a special character through ttyoutput.
1972 if (ttyoutput(*cp, tp) >= 0) {
1973 /* No Clists, wait a bit. */
1975 if (flag & IO_NDELAY) {
1976 error = EWOULDBLOCK;
1979 error = ttysleep(tp, &lbolt,
1988 if (ISSET(tp->t_lflag, FLUSHO) ||
1989 tp->t_outq.c_cc > hiwat)
1995 * A bunch of normal characters have been found.
1996 * Transfer them en masse to the output queue and
1997 * continue processing at the top of the loop.
1998 * If there are any further characters in this
1999 * <= OBUFSIZ chunk, the first should be a character
2000 * requiring special handling by ttyoutput.
2003 i = b_to_q(cp, ce, &tp->t_outq);
2006 cp += ce, cc -= ce, tk_nout += ce;
2009 /* No Clists, wait a bit. */
2011 if (flag & IO_NDELAY) {
2012 error = EWOULDBLOCK;
2015 error = ttysleep(tp, &lbolt, PCATCH,
2021 if (ISSET(tp->t_lflag, FLUSHO) ||
2022 tp->t_outq.c_cc > hiwat)
2029 * If cc is nonzero, we leave the uio structure inconsistent, as the
2030 * offset and iov pointers have moved forward, but it doesn't matter
2031 * (the call will either return short or restart with a new uio).
2033 uio->uio_resid += cc;
2040 * This can only occur if FLUSHO is set in t_lflag,
2041 * or if ttstart/oproc is synchronous (or very fast).
2043 if (tp->t_outq.c_cc <= hiwat) {
2047 if (flag & IO_NDELAY) {
2049 uio->uio_resid += cc;
2050 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2052 SET(tp->t_state, TS_SO_OLOWAT);
2053 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2055 if (error == EWOULDBLOCK)
2063 * Rubout one character from the rawq of tp
2064 * as cleanly as possible.
2067 ttyrub(int c, struct tty *tp)
2073 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2075 CLR(tp->t_lflag, FLUSHO);
2076 if (ISSET(tp->t_lflag, ECHOE)) {
2077 if (tp->t_rocount == 0) {
2079 * Screwed by ttwrite; retype
2084 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2087 CLR(c, ~TTY_CHARMASK);
2088 switch (CCLASS(c)) {
2097 if (ISSET(tp->t_lflag, ECHOCTL))
2101 if (tp->t_rocount < tp->t_rawq.c_cc) {
2106 savecol = tp->t_column;
2107 SET(tp->t_state, TS_CNTTB);
2108 SET(tp->t_lflag, FLUSHO);
2109 tp->t_column = tp->t_rocol;
2110 cp = tp->t_rawq.c_cf;
2112 tabc = *cp; /* XXX FIX NEXTC */
2113 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2115 CLR(tp->t_lflag, FLUSHO);
2116 CLR(tp->t_state, TS_CNTTB);
2119 /* savecol will now be length of the tab. */
2120 savecol -= tp->t_column;
2121 tp->t_column += savecol;
2123 savecol = 8; /* overflow screw */
2124 while (--savecol >= 0)
2125 (void)ttyoutput('\b', tp);
2128 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2129 (void)kprintf(PANICSTR, c, CCLASS(c));
2131 panic(PANICSTR, c, CCLASS(c));
2135 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2136 if (!ISSET(tp->t_state, TS_ERASE)) {
2137 SET(tp->t_state, TS_ERASE);
2138 (void)ttyoutput('\\', tp);
2142 ttyecho(tp->t_cc[VERASE], tp);
2144 * This code may be executed not only when an ERASE key
2145 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2146 * So, I didn't think it was worthwhile to pass the extra
2147 * information (which would need an extra parameter,
2148 * changing every call) needed to distinguish the ERASE2
2149 * case from the ERASE.
2156 * Back over cnt characters, erasing them.
2159 ttyrubo(struct tty *tp, int cnt)
2163 (void)ttyoutput('\b', tp);
2164 (void)ttyoutput(' ', tp);
2165 (void)ttyoutput('\b', tp);
2171 * Reprint the rawq line. Note, it is assumed that c_cc has already
2175 ttyretype(struct tty *tp)
2180 /* Echo the reprint character. */
2181 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2182 ttyecho(tp->t_cc[VREPRINT], tp);
2184 (void)ttyoutput('\n', tp);
2188 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2189 * BIT OF FIRST CHAR.
2192 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2193 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2195 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2196 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2198 CLR(tp->t_state, TS_ERASE);
2201 tp->t_rocount = tp->t_rawq.c_cc;
2206 * Echo a typed character to the terminal.
2209 ttyecho(int c, struct tty *tp)
2212 if (!ISSET(tp->t_state, TS_CNTTB))
2213 CLR(tp->t_lflag, FLUSHO);
2214 if ((!ISSET(tp->t_lflag, ECHO) &&
2215 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2216 ISSET(tp->t_lflag, EXTPROC))
2218 if (ISSET(tp->t_lflag, ECHOCTL) &&
2219 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2220 ISSET(c, TTY_CHARMASK) == 0177)) {
2221 (void)ttyoutput('^', tp);
2222 CLR(c, ~TTY_CHARMASK);
2228 (void)ttyoutput(c, tp);
2232 * Wake up any readers on a tty.
2235 ttwakeup(struct tty *tp)
2238 if (tp->t_rsel.si_pid != 0)
2239 selwakeup(&tp->t_rsel);
2240 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2241 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2242 wakeup(TSA_HUP_OR_INPUT(tp));
2243 KNOTE(&tp->t_rsel.si_note, 0);
2247 * Wake up any writers on a tty.
2250 ttwwakeup(struct tty *tp)
2253 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2254 selwakeup(&tp->t_wsel);
2255 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2256 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2257 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2258 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2259 CLR(tp->t_state, TS_SO_OCOMPLETE);
2260 wakeup(TSA_OCOMPLETE(tp));
2262 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2263 tp->t_outq.c_cc <= tp->t_olowat) {
2264 CLR(tp->t_state, TS_SO_OLOWAT);
2265 wakeup(TSA_OLOWAT(tp));
2267 KNOTE(&tp->t_wsel.si_note, 0);
2271 * Look up a code for a specified speed in a conversion table;
2272 * used by drivers to map software speed values to hardware parameters.
2275 ttspeedtab(int speed, struct speedtab *table)
2278 for ( ; table->sp_speed != -1; table++)
2279 if (table->sp_speed == speed)
2280 return (table->sp_code);
2285 * Set input and output watermarks and buffer sizes. For input, the
2286 * high watermark is about one second's worth of input above empty, the
2287 * low watermark is slightly below high water, and the buffer size is a
2288 * driver-dependent amount above high water. For output, the watermarks
2289 * are near the ends of the buffer, with about 1 second's worth of input
2290 * between them. All this only applies to the standard line discipline.
2293 ttsetwater(struct tty *tp)
2295 int cps, ttmaxhiwat, x;
2298 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2299 switch (tp->t_ispeedwat) {
2301 cps = tp->t_ispeed / 10;
2305 * This case is for old drivers that don't know about
2306 * t_ispeedwat. Arrange for them to get the old buffer
2307 * sizes and watermarks.
2309 cps = TTYHOG - 2 * 256;
2310 tp->t_ififosize = 2 * 2048;
2313 cps = tp->t_ispeedwat / 10;
2317 tp->t_ilowat = 7 * cps / 8;
2318 x = cps + tp->t_ififosize;
2319 clist_alloc_cblocks(&tp->t_rawq, x, x);
2322 switch (tp->t_ospeedwat) {
2324 cps = tp->t_ospeed / 10;
2325 ttmaxhiwat = 2 * TTMAXHIWAT;
2328 cps = tp->t_ospeed / 10;
2329 ttmaxhiwat = TTMAXHIWAT;
2332 cps = tp->t_ospeedwat / 10;
2333 ttmaxhiwat = 8 * TTMAXHIWAT;
2336 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2337 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2339 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2340 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2341 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2343 clist_alloc_cblocks(&tp->t_outq, x, x);
2348 * Report on state of foreground process group.
2351 ttyinfo(struct tty *tp)
2353 struct proc *p, *pick;
2358 if (ttycheckoutq(tp,0) == 0)
2362 * We always print the load average, then figure out what else to
2363 * print based on the state of the current process group.
2365 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2366 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2368 if (tp->t_session == NULL) {
2369 ttyprintf(tp, "not a controlling terminal\n");
2370 } else if (tp->t_pgrp == NULL) {
2371 ttyprintf(tp, "no foreground process group\n");
2372 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2373 ttyprintf(tp, "empty foreground process group\n");
2376 * Pick an interesting process. Note that certain elements,
2377 * in particular the wmesg, require a critical section for
2378 * safe access (YYY and we are still not MP safe).
2380 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2390 /* XXX lwp should compare lwps */
2392 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2393 if (proc_compare(pick, p))
2398 lp = FIRST_LWP_IN_PROC(pick);
2400 ttyprintf(tp, "foreground process without lwp\n");
2406 * Figure out what wait/process-state message, and command
2410 * XXX lwp This is a horrible mixture. We need to rework this
2411 * as soon as lwps have their own runnable status.
2413 if (pick->p_flag & P_WEXIT)
2415 else if (lp->lwp_stat == LSRUN)
2417 else if (pick->p_stat == SIDL)
2419 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2420 str = lp->lwp_wmesg;
2424 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2425 pick->p_comm, pick->p_pid, str);
2428 * Calculate cpu usage, percent cpu, and cmsz. Note that
2429 * 'pick' becomes invalid the moment we exit the critical
2432 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) {
2433 calcru_proc(pick, &ru);
2439 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2441 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2444 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2451 ttyprintf(tp, " %s ", buf);
2452 ttyprintf(tp, "%ld.%02ldu ",
2453 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2454 ttyprintf(tp, "%ld.%02lds ",
2455 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2456 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2458 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2462 * Returns 1 if p2 is "better" than p1
2464 * The algorithm for picking the "interesting" process is thus:
2466 * 1) Only foreground processes are eligible - implied.
2467 * 2) Runnable processes are favored over anything else. The runner
2468 * with the highest cpu utilization is picked (p_cpticks). Ties are
2469 * broken by picking the highest pid.
2470 * 3) The sleeper with the shortest sleep time is next. With ties,
2471 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2472 * 4) Further ties are broken by picking the highest pid.
2474 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2475 #define TESTAB(a, b) ((a)<<1 | (b))
2481 proc_compare(struct proc *p1, struct proc *p2)
2483 struct lwp *lp1, *lp2;
2490 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2496 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2500 lp1 = FIRST_LWP_IN_PROC(p1);
2501 lp2 = FIRST_LWP_IN_PROC(p2);
2504 * see if at least one of them is runnable
2506 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2513 * tie - favor one with highest recent cpu utilization
2515 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2517 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2519 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2522 * pick the one with the smallest sleep time
2524 if (lp2->lwp_slptime > lp1->lwp_slptime)
2526 if (lp1->lwp_slptime > lp2->lwp_slptime)
2529 * favor one sleeping in a non-interruptible sleep
2531 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2533 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2535 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2539 * Output char to tty; console putchar style.
2542 tputchar(int c, struct tty *tp)
2545 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2550 (void)ttyoutput('\r', tp);
2551 (void)ttyoutput(c, tp);
2558 * Sleep on chan, returning ERESTART if tty changed while we napped and
2559 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2560 * the tty is revoked, restarting a pending call will redo validation done
2561 * at the start of the call.
2564 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2570 error = tsleep(chan, slpflags, wmesg, timo);
2573 return (tp->t_gen == gen ? 0 : ERESTART);
2577 * Allocate a tty struct. Clists in the struct will be allocated by
2581 ttymalloc(struct tty *tp)
2586 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2593 * Free a tty struct. Clists in the struct should have been freed by
2596 * XXX not yet usable: since we support a half-closed state and do not
2597 * ref count the tty reference from the session, it is possible for a
2598 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2601 ttyfree(struct tty *tp)
2608 ttyregister(struct tty *tp)
2610 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2614 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2618 SLIST_FOREACH(tp, &tty_list, t_list) {
2621 t.t_dev = (cdev_t)dev2udev(t.t_dev);
2622 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2629 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2630 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2633 nottystop(struct tty *tp, int rw)
2640 ttyread(struct dev_read_args *ap)
2644 tp = ap->a_head.a_dev->si_tty;
2647 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2651 ttywrite(struct dev_write_args *ap)
2655 tp = ap->a_head.a_dev->si_tty;
2658 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));