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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20 * This product includes software developed by the University of
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22 * 4. Neither the name of the University nor the names of its contributors
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
84 #include <sys/clist.h>
86 #include <sys/fcntl.h>
88 #include <sys/dkstat.h>
90 #include <sys/kernel.h>
91 #include <sys/vnode.h>
92 #include <sys/signalvar.h>
93 #include <sys/signal2.h>
94 #include <sys/resourcevar.h>
95 #include <sys/malloc.h>
96 #include <sys/filedesc.h>
97 #include <sys/sysctl.h>
98 #include <sys/thread2.h>
101 #include <sys/lock.h>
103 #include <vm/vm_map.h>
105 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
107 static int proc_compare (struct proc *p1, struct proc *p2);
108 static int ttnread (struct tty *tp);
109 static void ttyecho (int c, struct tty *tp);
110 static int ttyoutput (int c, struct tty *tp);
111 static void ttypend (struct tty *tp);
112 static void ttyretype (struct tty *tp);
113 static void ttyrub (int c, struct tty *tp);
114 static void ttyrubo (struct tty *tp, int cnt);
115 static void ttyunblock (struct tty *tp);
116 static int ttywflush (struct tty *tp);
117 static int filt_ttyread (struct knote *kn, long hint);
118 static void filt_ttyrdetach (struct knote *kn);
119 static int filt_ttywrite (struct knote *kn, long hint);
120 static void filt_ttywdetach (struct knote *kn);
123 * Table with character classes and parity. The 8th bit indicates parity,
124 * the 7th bit indicates the character is an alphameric or underscore (for
125 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
126 * are 0 then the character needs no special processing on output; classes
127 * other than 0 might be translated or (not currently) require delays.
129 #define E 0x00 /* Even parity. */
130 #define O 0x80 /* Odd parity. */
131 #define PARITY(c) (char_type[c] & O)
133 #define ALPHA 0x40 /* Alpha or underscore. */
134 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
136 #define CCLASSMASK 0x3f
137 #define CCLASS(c) (char_type[c] & CCLASSMASK)
142 #define NA ORDINARY | ALPHA
148 static u_char const char_type[] = {
149 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
150 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
151 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
152 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
153 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
154 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
156 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
157 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
159 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
160 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
161 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
163 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
164 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
166 * Meta chars; should be settable per character set;
167 * for now, treat them all as normal characters.
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
183 NA, NA, NA, NA, NA, NA, NA, NA,
184 NA, NA, NA, NA, NA, NA, NA, NA,
195 /* Macros to clear/set/test flags. */
196 #define SET(t, f) (t) |= (f)
197 #define CLR(t, f) (t) &= ~(f)
198 #define ISSET(t, f) ((t) & (f))
200 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
201 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
204 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
205 "LU", "TTY input statistic");
207 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
208 "LU", "TTY output statistic");
212 * list of struct tty where pstat(8) can pick it up with sysctl
214 static SLIST_HEAD(, tty) tty_list;
217 * Initial open of tty, or (re)entry to standard tty line discipline.
220 ttyopen(cdev_t device, struct tty *tp)
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
245 ttyclose(struct tty *tp)
247 funsetown(tp->t_sigio);
252 ttyflush(tp, FREAD | FWRITE);
253 clist_free_cblocks(&tp->t_canq);
254 clist_free_cblocks(&tp->t_outq);
255 clist_free_cblocks(&tp->t_rawq);
258 tp->t_line = TTYDISC;
266 * Disassociate the tty from its session. Traditionally this has only been
267 * a half-close, meaning that the session was still allowed to point at the
268 * tty (resulting in the tty in the ps command showing something like 'p0-'),
269 * even though the tty is no longer pointing at the session.
271 * The half close seems to be useful only for 'ps' output but there is as
272 * yet no reason to remove the feature. The full-close code is currently
273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
276 ttyclearsession(struct tty *tp)
281 if ((sp = tp->t_session) != NULL) {
282 tp->t_session = NULL;
283 #ifdef TTY_DO_FULL_CLOSE
284 /* FULL CLOSE (not yet) */
285 if (sp->s_ttyp == tp) {
288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
289 "%p/%p\n", sp->s_ttyp, tp);
296 * Release the tty vnode association for a session. This is the
297 * 'other half' of the close. Because multiple opens of /dev/tty
298 * only generate a single open to the actual tty, the file modes
299 * are locked to FREAD|FWRITE.
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
305 ttyclosesession(struct session *sp, int dorevoke)
311 * There may not be a controlling terminal or it may have been closed
314 if ((vp = sp->s_ttyvp) == NULL)
318 * We need a lock if we have to close or revoke.
320 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
322 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
328 * Retry if the vnode was ripped out from under us
330 if (vp != sp->s_ttyvp) {
337 * Close and revoke as needed
340 if (vp->v_flag & VCTTYISOPEN) {
341 vclrflags(vp, VCTTYISOPEN);
342 VOP_CLOSE(vp, FREAD|FWRITE);
346 vrevoke(vp, proc0.p_ucred);
354 #define FLUSHQ(q) { \
356 ndflush(q, (q)->c_cc); \
359 /* Is 'c' a line delimiter ("break" character)? */
360 #define TTBREAKC(c, lflag) \
361 ((c) == '\n' || (((c) == cc[VEOF] || \
362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
363 (c) != _POSIX_VDISABLE))
366 * Process input of a single character received on a tty.
369 ttyinput(int c, struct tty *tp)
371 tcflag_t iflag, lflag;
376 * If input is pending take it first.
379 if (ISSET(lflag, PENDIN))
384 if (ISSET(lflag, ICANON))
391 * Block further input iff:
392 * current input > threshold AND input is available to user program
393 * AND input flow control is enabled and not yet invoked.
394 * The 3 is slop for PARMRK.
397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
398 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
399 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
400 !ISSET(tp->t_state, TS_TBLOCK))
403 /* Handle exceptional conditions (break, parity, framing). */
405 err = (ISSET(c, TTY_ERRORMASK));
407 CLR(c, TTY_ERRORMASK);
408 if (ISSET(err, TTY_BI)) {
409 if (ISSET(iflag, IGNBRK))
411 if (ISSET(iflag, BRKINT)) {
412 ttyflush(tp, FREAD | FWRITE);
413 pgsignal(tp->t_pgrp, SIGINT, 1);
416 if (ISSET(iflag, PARMRK))
418 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
419 || ISSET(err, TTY_FE)) {
420 if (ISSET(iflag, IGNPAR))
422 else if (ISSET(iflag, PARMRK)) {
424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
427 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
428 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
429 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
436 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
438 if (!ISSET(lflag, EXTPROC)) {
440 * Check for literal nexting very first
442 if (ISSET(tp->t_state, TS_LNCH)) {
444 CLR(tp->t_state, TS_LNCH);
447 * Scan for special characters. This code
448 * is really just a big case statement with
449 * non-constant cases. The bottom of the
450 * case statement is labeled ``endcase'', so goto
451 * it after a case match, or similar.
455 * Control chars which aren't controlled
456 * by ICANON, ISIG, or IXON.
458 if (ISSET(lflag, IEXTEN)) {
459 if (CCEQ(cc[VLNEXT], c)) {
460 if (ISSET(lflag, ECHO)) {
461 if (ISSET(lflag, ECHOE)) {
462 (void)ttyoutput('^', tp);
463 (void)ttyoutput('\b', tp);
467 SET(tp->t_state, TS_LNCH);
470 if (CCEQ(cc[VDISCARD], c)) {
471 if (ISSET(lflag, FLUSHO))
472 CLR(tp->t_lflag, FLUSHO);
474 ttyflush(tp, FWRITE);
476 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
478 SET(tp->t_lflag, FLUSHO);
486 if (ISSET(lflag, ISIG)) {
487 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
488 if (!ISSET(lflag, NOFLSH))
489 ttyflush(tp, FREAD | FWRITE);
492 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
495 if (CCEQ(cc[VSUSP], c)) {
496 if (!ISSET(lflag, NOFLSH))
499 pgsignal(tp->t_pgrp, SIGTSTP, 1);
504 * Handle start/stop characters.
506 if (ISSET(iflag, IXON)) {
507 if (CCEQ(cc[VSTOP], c)) {
508 if (!ISSET(tp->t_state, TS_TTSTOP)) {
509 SET(tp->t_state, TS_TTSTOP);
510 (*tp->t_stop)(tp, 0);
513 if (!CCEQ(cc[VSTART], c))
516 * if VSTART == VSTOP then toggle
520 if (CCEQ(cc[VSTART], c))
524 * IGNCR, ICRNL, & INLCR
527 if (ISSET(iflag, IGNCR))
529 else if (ISSET(iflag, ICRNL))
531 } else if (c == '\n' && ISSET(iflag, INLCR))
534 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
536 * From here on down canonical mode character
537 * processing takes place.
540 * erase or erase2 (^H / ^?)
542 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
544 ttyrub(clist_unputc(&tp->t_rawq), tp);
550 if (CCEQ(cc[VKILL], c)) {
551 if (ISSET(lflag, ECHOKE) &&
552 tp->t_rawq.c_cc == tp->t_rocount &&
553 !ISSET(lflag, ECHOPRT))
554 while (tp->t_rawq.c_cc)
555 ttyrub(clist_unputc(&tp->t_rawq), tp);
558 if (ISSET(lflag, ECHOK) ||
559 ISSET(lflag, ECHOKE))
564 CLR(tp->t_state, TS_LOCAL);
570 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
581 * erase last char of word and remember the
582 * next chars type (for ALTWERASE)
585 c = clist_unputc(&tp->t_rawq);
588 if (c == ' ' || c == '\t') {
589 clist_putc(c, &tp->t_rawq);
598 c = clist_unputc(&tp->t_rawq);
601 } while (c != ' ' && c != '\t' &&
602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
603 clist_putc(c, &tp->t_rawq);
609 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
614 * ^T - kernel info and generate SIGINFO
616 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
617 if (ISSET(lflag, ISIG))
618 pgsignal(tp->t_pgrp, SIGINFO, 1);
619 if (!ISSET(lflag, NOKERNINFO))
623 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
624 if (ISSET(lflag, ISIG))
625 pgsignal(tp->t_pgrp, SIGCKPT, 1);
630 * Check for input buffer overflow
632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
634 if (ISSET(iflag, IMAXBEL)) {
635 if (tp->t_outq.c_cc < tp->t_ohiwat)
636 (void)ttyoutput(CTRL('g'), tp);
641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
649 if (clist_putc(c, &tp->t_rawq) >= 0) {
650 if (!ISSET(lflag, ICANON)) {
655 if (TTBREAKC(c, lflag)) {
657 catq(&tp->t_rawq, &tp->t_canq);
659 } else if (tp->t_rocount++ == 0)
660 tp->t_rocol = tp->t_column;
661 if (ISSET(tp->t_state, TS_ERASE)) {
663 * end of prterase \.../
665 CLR(tp->t_state, TS_ERASE);
666 (void)ttyoutput('/', tp);
670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
672 * Place the cursor over the '^' of the ^D.
674 i = imin(2, tp->t_column - i);
676 (void)ttyoutput('\b', tp);
683 * IXANY means allow any character to restart output.
685 if (ISSET(tp->t_state, TS_TTSTOP) &&
686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
689 CLR(tp->t_lflag, FLUSHO);
690 CLR(tp->t_state, TS_TTSTOP);
692 return (ttstart(tp));
696 * Output a single character on a tty, doing output processing
697 * as needed (expanding tabs, newline processing, etc.).
698 * Returns < 0 if succeeds, otherwise returns char to resend.
702 ttyoutput(int c, struct tty *tp)
708 if (!ISSET(oflag, OPOST)) {
709 if (ISSET(tp->t_lflag, FLUSHO))
711 if (clist_putc(c, &tp->t_outq))
718 * Do tab expansion if OXTABS is set. Special case if we external
719 * processing, we don't do the tab expansion because we'll probably
720 * get it wrong. If tab expansion needs to be done, let it happen
723 CLR(c, ~TTY_CHARMASK);
725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
726 c = 8 - (tp->t_column & 7);
727 if (!ISSET(tp->t_lflag, FLUSHO)) {
728 crit_enter(); /* Don't interrupt tabs. */
729 c -= b_to_q(" ", c, &tp->t_outq);
735 return (c ? -1 : '\t');
737 if (c == CEOT && ISSET(oflag, ONOEOT))
741 * Newline translation: if ONLCR is set,
742 * translate newline into "\r\n".
744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
750 /* If OCRNL is set, translate "\r" into "\n". */
751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
753 /* If ONOCR is set, don't transmit CRs when on column 0. */
754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
771 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
781 col = (col + 8) & ~7;
789 * Ioctls for all tty devices. Called after line-discipline specific ioctl
790 * has been called to do discipline-specific functions and/or reject any
791 * of these ioctl commands.
795 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
797 struct thread *td = curthread;
798 struct lwp *lp = td->td_lwp;
799 struct proc *p = td->td_proc;
804 /* If the ioctl involves modification, hang if in the background. */
828 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
838 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
839 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
841 if (p->p_pgrp->pg_jobc == 0)
843 pgsignal(p->p_pgrp, SIGTTOU, 1);
844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
852 switch (cmd) { /* Process the ioctl. */
853 case FIOASYNC: /* set/clear async i/o */
856 SET(tp->t_state, TS_ASYNC);
858 CLR(tp->t_state, TS_ASYNC);
861 case FIONREAD: /* get # bytes to read */
863 *(int *)data = ttnread(tp);
869 * Policy -- Don't allow FIOSETOWN on someone else's
872 if (tp->t_session != NULL && !isctty(p, tp))
875 error = fsetown(*(int *)data, &tp->t_sigio);
880 if (tp->t_session != NULL && !isctty(p, tp))
882 *(int *)data = fgetown(tp->t_sigio);
885 case TIOCEXCL: /* set exclusive use of tty */
887 SET(tp->t_state, TS_XCLUDE);
890 case TIOCFLUSH: { /* flush buffers */
891 int flags = *(int *)data;
894 flags = FREAD | FWRITE;
896 flags &= FREAD | FWRITE;
900 case TIOCCONS: /* become virtual console */
902 if (constty && constty != tp &&
903 ISSET(constty->t_state, TS_CONNECTED))
906 if ((error = priv_check(td, PRIV_ROOT)) != 0)
910 } else if (tp == constty)
913 case TIOCDRAIN: /* wait till output drained */
918 case TIOCGETA: { /* get termios struct */
919 struct termios *t = (struct termios *)data;
921 bcopy(&tp->t_termios, t, sizeof(struct termios));
924 case TIOCGETD: /* get line discipline */
925 *(int *)data = tp->t_line;
927 case TIOCGWINSZ: /* get window size */
928 *(struct winsize *)data = tp->t_winsize;
930 case TIOCGPGRP: /* get pgrp of tty */
933 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
935 case TIOCGSID: /* get sid of tty */
938 *(int *)data = tp->t_session->s_sid;
941 case TIOCHPCL: /* hang up on last close */
943 SET(tp->t_cflag, HUPCL);
947 case TIOCNXCL: /* reset exclusive use of tty */
949 CLR(tp->t_state, TS_XCLUDE);
952 case TIOCOUTQ: /* output queue size */
953 *(int *)data = tp->t_outq.c_cc;
955 case TIOCSETA: /* set termios struct */
956 case TIOCSETAW: /* drain output, set */
957 case TIOCSETAF: { /* drn out, fls in, set */
958 struct termios *t = (struct termios *)data;
960 if (t->c_ispeed == 0)
961 t->c_ispeed = t->c_ospeed;
962 if (t->c_ispeed == 0)
963 t->c_ispeed = tp->t_ospeed;
964 if (t->c_ispeed == 0)
967 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
973 if (cmd == TIOCSETAF)
976 if (!ISSET(t->c_cflag, CIGNORE)) {
978 * Set device hardware.
980 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
984 if (ISSET(t->c_cflag, CLOCAL) &&
985 !ISSET(tp->t_cflag, CLOCAL)) {
987 * XXX disconnections would be too hard to
988 * get rid of without this kludge. The only
989 * way to get rid of controlling terminals
990 * is to exit from the session leader.
992 CLR(tp->t_state, TS_ZOMBIE);
994 wakeup(TSA_CARR_ON(tp));
998 if ((ISSET(tp->t_state, TS_CARR_ON) ||
999 ISSET(t->c_cflag, CLOCAL)) &&
1000 !ISSET(tp->t_state, TS_ZOMBIE))
1001 SET(tp->t_state, TS_CONNECTED);
1003 CLR(tp->t_state, TS_CONNECTED);
1004 tp->t_cflag = t->c_cflag;
1005 tp->t_ispeed = t->c_ispeed;
1006 if (t->c_ospeed != 0)
1007 tp->t_ospeed = t->c_ospeed;
1010 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1012 if (ISSET(t->c_lflag, ICANON))
1013 SET(tp->t_lflag, PENDIN);
1016 * XXX we really shouldn't allow toggling
1017 * ICANON while we're in a non-termios line
1018 * discipline. Now we have to worry about
1019 * panicing for a null queue.
1021 if (tp->t_canq.c_cbreserved > 0 &&
1022 tp->t_rawq.c_cbreserved > 0) {
1023 catq(&tp->t_rawq, &tp->t_canq);
1025 * XXX the queue limits may be
1026 * different, so the old queue
1027 * swapping method no longer works.
1029 catq(&tp->t_canq, &tp->t_rawq);
1031 CLR(tp->t_lflag, PENDIN);
1035 tp->t_iflag = t->c_iflag;
1036 tp->t_oflag = t->c_oflag;
1038 * Make the EXTPROC bit read only.
1040 if (ISSET(tp->t_lflag, EXTPROC))
1041 SET(t->c_lflag, EXTPROC);
1043 CLR(t->c_lflag, EXTPROC);
1044 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1045 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1046 t->c_cc[VTIME] != tp->t_cc[VTIME])
1048 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1052 case TIOCSETD: { /* set line discipline */
1053 int t = *(int *)data;
1054 cdev_t device = tp->t_dev;
1056 if ((u_int)t >= nlinesw)
1058 if (t != tp->t_line) {
1060 (*linesw[tp->t_line].l_close)(tp, flag);
1061 error = (*linesw[t].l_open)(device, tp);
1063 (void)(*linesw[tp->t_line].l_open)(device, tp);
1072 case TIOCSTART: /* start output, like ^Q */
1074 if (ISSET(tp->t_state, TS_TTSTOP) ||
1075 ISSET(tp->t_lflag, FLUSHO)) {
1076 CLR(tp->t_lflag, FLUSHO);
1077 CLR(tp->t_state, TS_TTSTOP);
1082 case TIOCSTI: /* simulate terminal input */
1083 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
1085 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
1088 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1091 case TIOCSTOP: /* stop output, like ^S */
1093 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1094 SET(tp->t_state, TS_TTSTOP);
1095 (*tp->t_stop)(tp, 0);
1099 case TIOCSCTTY: /* become controlling tty */
1100 /* Session ctty vnode pointer set in vnode layer. */
1101 if (!SESS_LEADER(p) ||
1102 ((p->p_session->s_ttyvp || tp->t_session) &&
1103 (tp->t_session != p->p_session)))
1105 tp->t_session = p->p_session;
1106 tp->t_pgrp = p->p_pgrp;
1107 p->p_session->s_ttyp = tp;
1108 p->p_flag |= P_CONTROLT;
1110 case TIOCSPGRP: { /* set pgrp of tty */
1111 pid_t pgid = *(int *)data;
1115 else if (pgid < 1 || pgid > PID_MAX)
1118 struct pgrp *pgrp = pgfind(pgid);
1119 if (pgrp == NULL || pgrp->pg_session != p->p_session)
1126 case TIOCSTAT: /* simulate control-T */
1131 case TIOCSWINSZ: /* set window size */
1132 if (bcmp((caddr_t)&tp->t_winsize, data,
1133 sizeof (struct winsize))) {
1134 tp->t_winsize = *(struct winsize *)data;
1135 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1138 case TIOCSDRAINWAIT:
1139 error = priv_check(td, PRIV_ROOT);
1142 tp->t_timeout = *(int *)data * hz;
1143 wakeup(TSA_OCOMPLETE(tp));
1144 wakeup(TSA_OLOWAT(tp));
1146 case TIOCGDRAINWAIT:
1147 *(int *)data = tp->t_timeout / hz;
1150 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1151 return (ttcompat(tp, cmd, data, flag));
1160 ttypoll(struct dev_poll_args *ap)
1162 cdev_t dev = ap->a_head.a_dev;
1163 int events = ap->a_events;
1168 /* XXX used to return ENXIO, but that means true! */
1170 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1171 POLLWRNORM)) | POLLHUP;
1176 if (events & (POLLIN | POLLRDNORM)) {
1177 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1178 revents |= events & (POLLIN | POLLRDNORM);
1180 selrecord(curthread, &tp->t_rsel);
1182 if (events & (POLLOUT | POLLWRNORM)) {
1183 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1184 ISSET(tp->t_state, TS_CONNECTED))
1185 || ISSET(tp->t_state, TS_ZOMBIE))
1186 revents |= events & (POLLOUT | POLLWRNORM);
1188 selrecord(curthread, &tp->t_wsel);
1191 ap->a_events = revents;
1195 static struct filterops ttyread_filtops =
1196 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1197 static struct filterops ttywrite_filtops =
1198 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1201 ttykqfilter(struct dev_kqfilter_args *ap)
1203 cdev_t dev = ap->a_head.a_dev;
1204 struct knote *kn = ap->a_kn;
1205 struct tty *tp = dev->si_tty;
1206 struct klist *klist;
1209 switch (kn->kn_filter) {
1211 klist = &tp->t_rsel.si_note;
1212 kn->kn_fop = &ttyread_filtops;
1215 klist = &tp->t_wsel.si_note;
1216 kn->kn_fop = &ttywrite_filtops;
1223 kn->kn_hook = (caddr_t)dev;
1226 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1233 filt_ttyrdetach(struct knote *kn)
1235 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1238 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1243 filt_ttyread(struct knote *kn, long hint)
1245 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1247 kn->kn_data = ttnread(tp);
1248 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1249 kn->kn_flags |= EV_EOF;
1252 return (kn->kn_data > 0);
1256 filt_ttywdetach(struct knote *kn)
1258 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1261 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1266 filt_ttywrite(struct knote *kn, long hint)
1268 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1270 kn->kn_data = tp->t_outq.c_cc;
1271 if (ISSET(tp->t_state, TS_ZOMBIE))
1273 return (kn->kn_data <= tp->t_olowat &&
1274 ISSET(tp->t_state, TS_CONNECTED));
1278 * Must be called while in a critical section.
1281 ttnread(struct tty *tp)
1285 if (ISSET(tp->t_lflag, PENDIN))
1287 nread = tp->t_canq.c_cc;
1288 if (!ISSET(tp->t_lflag, ICANON)) {
1289 nread += tp->t_rawq.c_cc;
1290 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1297 * Wait for output to drain.
1300 ttywait(struct tty *tp)
1306 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1307 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1309 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1310 ISSET(tp->t_state, TS_CONNECTED)) {
1311 SET(tp->t_state, TS_SO_OCOMPLETE);
1312 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1316 if (error == EWOULDBLOCK)
1323 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1330 * Flush if successfully wait.
1333 ttywflush(struct tty *tp)
1337 if ((error = ttywait(tp)) == 0)
1338 ttyflush(tp, FREAD);
1343 * Flush tty read and/or write queues, notifying anyone waiting.
1346 ttyflush(struct tty *tp, int rw)
1353 FLUSHQ(&tp->t_outq);
1354 CLR(tp->t_state, TS_TTSTOP);
1356 (*tp->t_stop)(tp, rw);
1358 FLUSHQ(&tp->t_canq);
1359 FLUSHQ(&tp->t_rawq);
1360 CLR(tp->t_lflag, PENDIN);
1363 CLR(tp->t_state, TS_LOCAL);
1365 if (ISSET(tp->t_state, TS_TBLOCK)) {
1367 FLUSHQ(&tp->t_outq);
1371 * Don't let leave any state that might clobber the
1372 * next line discipline (although we should do more
1373 * to send the START char). Not clearing the state
1374 * may have caused the "putc to a clist with no
1375 * reserved cblocks" panic/kprintf.
1377 CLR(tp->t_state, TS_TBLOCK);
1379 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1380 if (ISSET(tp->t_iflag, IXOFF)) {
1382 * XXX wait a bit in the hope that the stop
1383 * character (if any) will go out. Waiting
1384 * isn't good since it allows races. This
1385 * will be fixed when the stop character is
1386 * put in a special queue. Don't bother with
1387 * the checks in ttywait() since the timeout
1390 SET(tp->t_state, TS_SO_OCOMPLETE);
1391 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1394 * Don't try sending the stop character again.
1396 CLR(tp->t_state, TS_TBLOCK);
1403 FLUSHQ(&tp->t_outq);
1410 * Copy in the default termios characters.
1413 termioschars(struct termios *t)
1416 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1423 ttychars(struct tty *tp)
1426 termioschars(&tp->t_termios);
1430 * Handle input high water. Send stop character for the IXOFF case. Turn
1431 * on our input flow control bit and propagate the changes to the driver.
1432 * XXX the stop character should be put in a special high priority queue.
1435 ttyblock(struct tty *tp)
1438 SET(tp->t_state, TS_TBLOCK);
1439 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1440 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1441 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1446 * Handle input low water. Send start character for the IXOFF case. Turn
1447 * off our input flow control bit and propagate the changes to the driver.
1448 * XXX the start character should be put in a special high priority queue.
1451 ttyunblock(struct tty *tp)
1454 CLR(tp->t_state, TS_TBLOCK);
1455 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1456 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1457 SET(tp->t_state, TS_TBLOCK); /* try again later */
1462 /* Not used by any current (i386) drivers. */
1464 * Restart after an inter-char delay.
1467 ttrstrt(void *tp_arg)
1471 KASSERT(tp_arg != NULL, ("ttrstrt"));
1475 CLR(tp->t_state, TS_TIMEOUT);
1482 ttstart(struct tty *tp)
1485 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1491 * "close" a line discipline
1494 ttylclose(struct tty *tp, int flag)
1497 if (flag & FNONBLOCK || ttywflush(tp))
1498 ttyflush(tp, FREAD | FWRITE);
1503 * Handle modem control transition on a tty.
1504 * Flag indicates new state of carrier.
1505 * Returns 0 if the line should be turned off, otherwise 1.
1508 ttymodem(struct tty *tp, int flag)
1511 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1513 * MDMBUF: do flow control according to carrier flag
1514 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1515 * works if IXON and IXANY are clear.
1518 CLR(tp->t_state, TS_CAR_OFLOW);
1519 CLR(tp->t_state, TS_TTSTOP);
1521 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1522 SET(tp->t_state, TS_CAR_OFLOW);
1523 SET(tp->t_state, TS_TTSTOP);
1524 (*tp->t_stop)(tp, 0);
1526 } else if (flag == 0) {
1530 CLR(tp->t_state, TS_CARR_ON);
1531 if (ISSET(tp->t_state, TS_ISOPEN) &&
1532 !ISSET(tp->t_cflag, CLOCAL)) {
1533 SET(tp->t_state, TS_ZOMBIE);
1534 CLR(tp->t_state, TS_CONNECTED);
1535 if (tp->t_session && tp->t_session->s_leader)
1536 ksignal(tp->t_session->s_leader, SIGHUP);
1537 ttyflush(tp, FREAD | FWRITE);
1544 SET(tp->t_state, TS_CARR_ON);
1545 if (!ISSET(tp->t_state, TS_ZOMBIE))
1546 SET(tp->t_state, TS_CONNECTED);
1547 wakeup(TSA_CARR_ON(tp));
1555 * Reinput pending characters after state switch
1556 * call from a critical section.
1559 ttypend(struct tty *tp)
1564 CLR(tp->t_lflag, PENDIN);
1565 SET(tp->t_state, TS_TYPEN);
1567 * XXX this assumes too much about clist internals. It may even
1568 * fail if the cblock slush pool is empty. We can't allocate more
1569 * cblocks here because we are called from an interrupt handler
1570 * and clist_alloc_cblocks() can wait.
1573 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1574 tp->t_rawq.c_cbmax = tq.c_cbmax;
1575 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1576 while ((c = clist_getc(&tq)) >= 0)
1578 CLR(tp->t_state, TS_TYPEN);
1582 * Process a read call on a tty device.
1585 ttread(struct tty *tp, struct uio *uio, int flag)
1590 cc_t *cc = tp->t_cc;
1593 int first, error = 0;
1594 int has_stime = 0, last_cc = 0;
1595 long slp = 0; /* XXX this should be renamed `timo'. */
1596 struct timeval stime;
1598 lp = curthread->td_lwp;
1602 lflag = tp->t_lflag;
1604 * take pending input first
1606 if (ISSET(lflag, PENDIN)) {
1608 splz(); /* reduce latency */
1609 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1613 * Hang process if it's in the background.
1615 if ((pp = curproc) && isbackground(pp, tp)) {
1617 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1618 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1619 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1621 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1622 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1628 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1630 return (0); /* EOF */
1634 * If canonical, use the canonical queue,
1635 * else use the raw queue.
1637 * (should get rid of clists...)
1639 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1641 if (flag & IO_NDELAY) {
1644 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1649 return (EWOULDBLOCK);
1651 if (!ISSET(lflag, ICANON)) {
1654 struct timeval timecopy;
1657 * Check each of the four combinations.
1658 * (m > 0 && t == 0) is the normal read case.
1659 * It should be fairly efficient, so we check that and its
1660 * companion case (m == 0 && t == 0) first.
1661 * For the other two cases, we compute the target sleep time
1670 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1674 t *= 100000; /* time in us */
1675 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1676 ((t1).tv_usec - (t2).tv_usec))
1682 getmicrotime(&timecopy);
1684 /* first character, start timer */
1688 } else if (qp->c_cc > last_cc) {
1689 /* got a character, restart timer */
1693 /* nothing, check expiration */
1694 slp = t - diff(timecopy, stime);
1699 } else { /* m == 0 */
1702 getmicrotime(&timecopy);
1708 slp = t - diff(timecopy, stime);
1710 /* Timed out, but 0 is enough input. */
1718 * Rounding down may make us wake up just short
1719 * of the target, so we round up.
1720 * The formula is ceiling(slp * hz/1000000).
1721 * 32-bit arithmetic is enough for hz < 169.
1722 * XXX see tvtohz() for how to avoid overflow if hz
1723 * is large (divide by `tick' and/or arrange to
1724 * use tvtohz() if hz is large).
1726 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1729 if (qp->c_cc <= 0) {
1732 * There is no input, or not enough input and we can block.
1734 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1735 ISSET(tp->t_state, TS_CONNECTED) ?
1736 "ttyin" : "ttyhup", (int)slp);
1738 if (error == EWOULDBLOCK)
1743 * XXX what happens if another process eats some input
1744 * while we are asleep (not just here)? It would be
1745 * safest to detect changes and reset our state variables
1746 * (has_stime and last_cc).
1754 * Input present, check for input mapping and processing.
1757 if (ISSET(lflag, ICANON | ISIG))
1763 icc = imin(uio->uio_resid, IBUFSIZ);
1764 icc = q_to_b(qp, ibuf, icc);
1770 error = uiomove(ibuf, icc, uio);
1772 * XXX if there was an error then we should ungetc() the
1773 * unmoved chars and reduce icc here.
1777 if (uio->uio_resid == 0)
1791 * delayed suspend (^Y)
1793 if (CCEQ(cc[VDSUSP], c) &&
1794 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1795 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1797 error = ttysleep(tp, &lbolt, PCATCH,
1806 * Interpret EOF only in canonical mode.
1808 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1811 * Give user character.
1813 error = ureadc(c, uio);
1815 /* XXX should ungetc(c, qp). */
1817 if (uio->uio_resid == 0)
1820 * In canonical mode check for a "break character"
1821 * marking the end of a "line of input".
1823 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1830 * Look to unblock input now that (presumably)
1831 * the input queue has gone down.
1834 if (ISSET(tp->t_state, TS_TBLOCK) &&
1835 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1843 * Check the output queue on tp for space for a kernel message (from uprintf
1844 * or tprintf). Allow some space over the normal hiwater mark so we don't
1845 * lose messages due to normal flow control, but don't let the tty run amok.
1846 * Sleeps here are not interruptible, but we return prematurely if new signals
1850 ttycheckoutq(struct tty *tp, int wait)
1852 struct lwp *lp = curthread->td_lwp;
1854 sigset_t oldset, newset;
1856 hiwat = tp->t_ohiwat;
1857 SIGEMPTYSET(oldset);
1858 SIGEMPTYSET(newset);
1861 oldset = lwp_sigpend(lp);
1862 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1863 while (tp->t_outq.c_cc > hiwat) {
1865 if (tp->t_outq.c_cc <= hiwat)
1868 newset = lwp_sigpend(lp);
1869 if (!wait || SIGSETNEQ(oldset, newset)) {
1873 SET(tp->t_state, TS_SO_OLOWAT);
1874 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1882 * Process a write call on a tty device.
1885 ttwrite(struct tty *tp, struct uio *uio, int flag)
1891 int i, hiwat, cnt, error;
1894 lp = curthread->td_lwp;
1895 hiwat = tp->t_ohiwat;
1896 cnt = uio->uio_resid;
1901 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1903 if (uio->uio_resid == cnt)
1907 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1908 if (flag & IO_NDELAY) {
1910 error = EWOULDBLOCK;
1913 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1922 * Hang the process if it's in the background.
1924 if ((pp = curproc) && isbackground(pp, tp) &&
1925 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1926 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1927 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1928 if (pp->p_pgrp->pg_jobc == 0) {
1932 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1933 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1939 * Process the user's data in at most OBUFSIZ chunks. Perform any
1940 * output translation. Keep track of high water mark, sleep on
1941 * overflow awaiting device aid in acquiring new space.
1943 while (uio->uio_resid > 0 || cc > 0) {
1944 if (ISSET(tp->t_lflag, FLUSHO)) {
1948 if (tp->t_outq.c_cc > hiwat)
1951 * Grab a hunk of data from the user, unless we have some
1952 * leftover from last time.
1955 cc = imin(uio->uio_resid, OBUFSIZ);
1957 error = uiomove(cp, cc, uio);
1964 * If nothing fancy need be done, grab those characters we
1965 * can handle without any of ttyoutput's processing and
1966 * just transfer them to the output q. For those chars
1967 * which require special processing (as indicated by the
1968 * bits in char_type), call ttyoutput. After processing
1969 * a hunk of data, look for FLUSHO so ^O's will take effect
1973 if (!ISSET(tp->t_oflag, OPOST))
1976 ce = cc - scanc((u_int)cc, (u_char *)cp,
1977 char_type, CCLASSMASK);
1979 * If ce is zero, then we're processing
1980 * a special character through ttyoutput.
1984 if (ttyoutput(*cp, tp) >= 0) {
1985 /* No Clists, wait a bit. */
1987 if (flag & IO_NDELAY) {
1988 error = EWOULDBLOCK;
1991 error = ttysleep(tp, &lbolt,
2000 if (ISSET(tp->t_lflag, FLUSHO) ||
2001 tp->t_outq.c_cc > hiwat)
2007 * A bunch of normal characters have been found.
2008 * Transfer them en masse to the output queue and
2009 * continue processing at the top of the loop.
2010 * If there are any further characters in this
2011 * <= OBUFSIZ chunk, the first should be a character
2012 * requiring special handling by ttyoutput.
2015 i = b_to_q(cp, ce, &tp->t_outq);
2018 cp += ce, cc -= ce, tk_nout += ce;
2021 /* No Clists, wait a bit. */
2023 if (flag & IO_NDELAY) {
2024 error = EWOULDBLOCK;
2027 error = ttysleep(tp, &lbolt, PCATCH,
2033 if (ISSET(tp->t_lflag, FLUSHO) ||
2034 tp->t_outq.c_cc > hiwat)
2041 * If cc is nonzero, we leave the uio structure inconsistent, as the
2042 * offset and iov pointers have moved forward, but it doesn't matter
2043 * (the call will either return short or restart with a new uio).
2045 uio->uio_resid += cc;
2052 * This can only occur if FLUSHO is set in t_lflag,
2053 * or if ttstart/oproc is synchronous (or very fast).
2055 if (tp->t_outq.c_cc <= hiwat) {
2059 if (flag & IO_NDELAY) {
2061 uio->uio_resid += cc;
2062 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2064 SET(tp->t_state, TS_SO_OLOWAT);
2065 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2067 if (error == EWOULDBLOCK)
2075 * Rubout one character from the rawq of tp
2076 * as cleanly as possible.
2079 ttyrub(int c, struct tty *tp)
2085 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2087 CLR(tp->t_lflag, FLUSHO);
2088 if (ISSET(tp->t_lflag, ECHOE)) {
2089 if (tp->t_rocount == 0) {
2091 * Screwed by ttwrite; retype
2096 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2099 CLR(c, ~TTY_CHARMASK);
2100 switch (CCLASS(c)) {
2109 if (ISSET(tp->t_lflag, ECHOCTL))
2113 if (tp->t_rocount < tp->t_rawq.c_cc) {
2118 savecol = tp->t_column;
2119 SET(tp->t_state, TS_CNTTB);
2120 SET(tp->t_lflag, FLUSHO);
2121 tp->t_column = tp->t_rocol;
2122 cp = tp->t_rawq.c_cf;
2124 tabc = *cp; /* XXX FIX NEXTC */
2125 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2127 CLR(tp->t_lflag, FLUSHO);
2128 CLR(tp->t_state, TS_CNTTB);
2131 /* savecol will now be length of the tab. */
2132 savecol -= tp->t_column;
2133 tp->t_column += savecol;
2135 savecol = 8; /* overflow screw */
2136 while (--savecol >= 0)
2137 (void)ttyoutput('\b', tp);
2140 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2141 (void)kprintf(PANICSTR, c, CCLASS(c));
2143 panic(PANICSTR, c, CCLASS(c));
2147 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2148 if (!ISSET(tp->t_state, TS_ERASE)) {
2149 SET(tp->t_state, TS_ERASE);
2150 (void)ttyoutput('\\', tp);
2154 ttyecho(tp->t_cc[VERASE], tp);
2156 * This code may be executed not only when an ERASE key
2157 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2158 * So, I didn't think it was worthwhile to pass the extra
2159 * information (which would need an extra parameter,
2160 * changing every call) needed to distinguish the ERASE2
2161 * case from the ERASE.
2168 * Back over cnt characters, erasing them.
2171 ttyrubo(struct tty *tp, int cnt)
2175 (void)ttyoutput('\b', tp);
2176 (void)ttyoutput(' ', tp);
2177 (void)ttyoutput('\b', tp);
2183 * Reprint the rawq line. Note, it is assumed that c_cc has already
2187 ttyretype(struct tty *tp)
2192 /* Echo the reprint character. */
2193 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2194 ttyecho(tp->t_cc[VREPRINT], tp);
2196 (void)ttyoutput('\n', tp);
2200 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2201 * BIT OF FIRST CHAR.
2204 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2205 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2207 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2208 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2210 CLR(tp->t_state, TS_ERASE);
2213 tp->t_rocount = tp->t_rawq.c_cc;
2218 * Echo a typed character to the terminal.
2221 ttyecho(int c, struct tty *tp)
2224 if (!ISSET(tp->t_state, TS_CNTTB))
2225 CLR(tp->t_lflag, FLUSHO);
2226 if ((!ISSET(tp->t_lflag, ECHO) &&
2227 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2228 ISSET(tp->t_lflag, EXTPROC))
2230 if (ISSET(tp->t_lflag, ECHOCTL) &&
2231 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2232 ISSET(c, TTY_CHARMASK) == 0177)) {
2233 (void)ttyoutput('^', tp);
2234 CLR(c, ~TTY_CHARMASK);
2240 (void)ttyoutput(c, tp);
2244 * Wake up any readers on a tty.
2247 ttwakeup(struct tty *tp)
2250 if (tp->t_rsel.si_pid != 0)
2251 selwakeup(&tp->t_rsel);
2252 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2253 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2254 wakeup(TSA_HUP_OR_INPUT(tp));
2255 KNOTE(&tp->t_rsel.si_note, 0);
2259 * Wake up any writers on a tty.
2262 ttwwakeup(struct tty *tp)
2265 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2266 selwakeup(&tp->t_wsel);
2267 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2268 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2269 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2270 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2271 CLR(tp->t_state, TS_SO_OCOMPLETE);
2272 wakeup(TSA_OCOMPLETE(tp));
2274 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2275 tp->t_outq.c_cc <= tp->t_olowat) {
2276 CLR(tp->t_state, TS_SO_OLOWAT);
2277 wakeup(TSA_OLOWAT(tp));
2279 KNOTE(&tp->t_wsel.si_note, 0);
2283 * Look up a code for a specified speed in a conversion table;
2284 * used by drivers to map software speed values to hardware parameters.
2287 ttspeedtab(int speed, struct speedtab *table)
2290 for ( ; table->sp_speed != -1; table++)
2291 if (table->sp_speed == speed)
2292 return (table->sp_code);
2297 * Set input and output watermarks and buffer sizes. For input, the
2298 * high watermark is about one second's worth of input above empty, the
2299 * low watermark is slightly below high water, and the buffer size is a
2300 * driver-dependent amount above high water. For output, the watermarks
2301 * are near the ends of the buffer, with about 1 second's worth of input
2302 * between them. All this only applies to the standard line discipline.
2305 ttsetwater(struct tty *tp)
2307 int cps, ttmaxhiwat, x;
2310 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2311 switch (tp->t_ispeedwat) {
2313 cps = tp->t_ispeed / 10;
2317 * This case is for old drivers that don't know about
2318 * t_ispeedwat. Arrange for them to get the old buffer
2319 * sizes and watermarks.
2321 cps = TTYHOG - 2 * 256;
2322 tp->t_ififosize = 2 * 2048;
2325 cps = tp->t_ispeedwat / 10;
2329 tp->t_ilowat = 7 * cps / 8;
2330 x = cps + tp->t_ififosize;
2331 clist_alloc_cblocks(&tp->t_rawq, x, x);
2334 switch (tp->t_ospeedwat) {
2336 cps = tp->t_ospeed / 10;
2337 ttmaxhiwat = 2 * TTMAXHIWAT;
2340 cps = tp->t_ospeed / 10;
2341 ttmaxhiwat = TTMAXHIWAT;
2344 cps = tp->t_ospeedwat / 10;
2345 ttmaxhiwat = 8 * TTMAXHIWAT;
2348 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2349 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2351 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2352 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2353 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2355 clist_alloc_cblocks(&tp->t_outq, x, x);
2360 * Report on state of foreground process group.
2363 ttyinfo(struct tty *tp)
2365 struct proc *p, *pick;
2370 if (ttycheckoutq(tp,0) == 0)
2374 * We always print the load average, then figure out what else to
2375 * print based on the state of the current process group.
2377 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2378 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2380 if (tp->t_session == NULL) {
2381 ttyprintf(tp, "not a controlling terminal\n");
2382 } else if (tp->t_pgrp == NULL) {
2383 ttyprintf(tp, "no foreground process group\n");
2384 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2385 ttyprintf(tp, "empty foreground process group\n");
2388 * Pick an interesting process. Note that certain elements,
2389 * in particular the wmesg, require a critical section for
2390 * safe access (YYY and we are still not MP safe).
2392 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2401 /* XXX lwp should compare lwps */
2403 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2404 if (proc_compare(pick, p))
2409 lp = FIRST_LWP_IN_PROC(pick);
2411 ttyprintf(tp, "foreground process without lwp\n");
2418 * Figure out what wait/process-state message, and command
2422 * XXX lwp This is a horrible mixture. We need to rework this
2423 * as soon as lwps have their own runnable status.
2425 if (pick->p_flag & P_WEXIT)
2427 else if (lp->lwp_stat == LSRUN)
2429 else if (pick->p_stat == SIDL)
2431 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2432 str = lp->lwp_wmesg;
2436 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2437 pick->p_comm, pick->p_pid, str);
2440 * Calculate cpu usage, percent cpu, and cmsz. Note that
2441 * 'pick' becomes invalid the moment we exit the critical
2444 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2445 calcru_proc(pick, &ru);
2447 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2449 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2452 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2459 ttyprintf(tp, " %s ", buf);
2460 ttyprintf(tp, "%ld.%02ldu ",
2461 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2462 ttyprintf(tp, "%ld.%02lds ",
2463 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2464 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2466 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2470 * Returns 1 if p2 is "better" than p1
2472 * The algorithm for picking the "interesting" process is thus:
2474 * 1) Only foreground processes are eligible - implied.
2475 * 2) Runnable processes are favored over anything else. The runner
2476 * with the highest cpu utilization is picked (p_cpticks). Ties are
2477 * broken by picking the highest pid.
2478 * 3) The sleeper with the shortest sleep time is next. With ties,
2479 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2480 * 4) Further ties are broken by picking the highest pid.
2482 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2483 #define TESTAB(a, b) ((a)<<1 | (b))
2489 proc_compare(struct proc *p1, struct proc *p2)
2491 struct lwp *lp1, *lp2;
2498 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2504 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2508 lp1 = FIRST_LWP_IN_PROC(p1);
2509 lp2 = FIRST_LWP_IN_PROC(p2);
2512 * see if at least one of them is runnable
2514 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2521 * tie - favor one with highest recent cpu utilization
2523 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2525 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2527 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2530 * pick the one with the smallest sleep time
2532 if (lp2->lwp_slptime > lp1->lwp_slptime)
2534 if (lp1->lwp_slptime > lp2->lwp_slptime)
2537 * favor one sleeping in a non-interruptible sleep
2539 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2541 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2543 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2547 * Output char to tty; console putchar style.
2550 tputchar(int c, struct tty *tp)
2553 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2558 (void)ttyoutput('\r', tp);
2559 (void)ttyoutput(c, tp);
2566 * Sleep on chan, returning ERESTART if tty changed while we napped and
2567 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2568 * the tty is revoked, restarting a pending call will redo validation done
2569 * at the start of the call.
2572 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2578 error = tsleep(chan, slpflags, wmesg, timo);
2581 return (tp->t_gen == gen ? 0 : ERESTART);
2587 * We bump the gen to force any ttysleep()'s to return with ERESTART
2588 * and flush the tty. The related fp's should already have been
2589 * replaced so the tty will close when the last references on the
2590 * original fp's go away.
2593 ttyrevoke(struct dev_revoke_args *ap)
2597 tp = ap->a_head.a_dev->si_tty;
2599 ttyflush(tp, FREAD | FWRITE);
2600 wakeup(TSA_CARR_ON(tp));
2607 * Allocate a tty struct. Clists in the struct will be allocated by
2611 ttymalloc(struct tty *tp)
2616 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2623 * Free a tty struct. Clists in the struct should have been freed by
2626 * XXX not yet usable: since we support a half-closed state and do not
2627 * ref count the tty reference from the session, it is possible for a
2628 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2631 ttyfree(struct tty *tp)
2638 ttyregister(struct tty *tp)
2640 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2644 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2648 SLIST_FOREACH(tp, &tty_list, t_list) {
2651 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
2652 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2659 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2660 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2663 nottystop(struct tty *tp, int rw)
2670 ttyread(struct dev_read_args *ap)
2674 tp = ap->a_head.a_dev->si_tty;
2677 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2681 ttywrite(struct dev_write_args *ap)
2685 tp = ap->a_head.a_dev->si_tty;
2688 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));