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);
345 VOP_REVOKE(vp, REVOKEALL);
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;
936 case TIOCHPCL: /* hang up on last close */
938 SET(tp->t_cflag, HUPCL);
942 case TIOCNXCL: /* reset exclusive use of tty */
944 CLR(tp->t_state, TS_XCLUDE);
947 case TIOCOUTQ: /* output queue size */
948 *(int *)data = tp->t_outq.c_cc;
950 case TIOCSETA: /* set termios struct */
951 case TIOCSETAW: /* drain output, set */
952 case TIOCSETAF: { /* drn out, fls in, set */
953 struct termios *t = (struct termios *)data;
955 if (t->c_ispeed == 0)
956 t->c_ispeed = t->c_ospeed;
957 if (t->c_ispeed == 0)
958 t->c_ispeed = tp->t_ospeed;
959 if (t->c_ispeed == 0)
962 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
968 if (cmd == TIOCSETAF)
971 if (!ISSET(t->c_cflag, CIGNORE)) {
973 * Set device hardware.
975 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
979 if (ISSET(t->c_cflag, CLOCAL) &&
980 !ISSET(tp->t_cflag, CLOCAL)) {
982 * XXX disconnections would be too hard to
983 * get rid of without this kludge. The only
984 * way to get rid of controlling terminals
985 * is to exit from the session leader.
987 CLR(tp->t_state, TS_ZOMBIE);
989 wakeup(TSA_CARR_ON(tp));
993 if ((ISSET(tp->t_state, TS_CARR_ON) ||
994 ISSET(t->c_cflag, CLOCAL)) &&
995 !ISSET(tp->t_state, TS_ZOMBIE))
996 SET(tp->t_state, TS_CONNECTED);
998 CLR(tp->t_state, TS_CONNECTED);
999 tp->t_cflag = t->c_cflag;
1000 tp->t_ispeed = t->c_ispeed;
1001 if (t->c_ospeed != 0)
1002 tp->t_ospeed = t->c_ospeed;
1005 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1007 if (ISSET(t->c_lflag, ICANON))
1008 SET(tp->t_lflag, PENDIN);
1011 * XXX we really shouldn't allow toggling
1012 * ICANON while we're in a non-termios line
1013 * discipline. Now we have to worry about
1014 * panicing for a null queue.
1016 if (tp->t_canq.c_cbreserved > 0 &&
1017 tp->t_rawq.c_cbreserved > 0) {
1018 catq(&tp->t_rawq, &tp->t_canq);
1020 * XXX the queue limits may be
1021 * different, so the old queue
1022 * swapping method no longer works.
1024 catq(&tp->t_canq, &tp->t_rawq);
1026 CLR(tp->t_lflag, PENDIN);
1030 tp->t_iflag = t->c_iflag;
1031 tp->t_oflag = t->c_oflag;
1033 * Make the EXTPROC bit read only.
1035 if (ISSET(tp->t_lflag, EXTPROC))
1036 SET(t->c_lflag, EXTPROC);
1038 CLR(t->c_lflag, EXTPROC);
1039 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1040 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1041 t->c_cc[VTIME] != tp->t_cc[VTIME])
1043 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1047 case TIOCSETD: { /* set line discipline */
1048 int t = *(int *)data;
1049 cdev_t device = tp->t_dev;
1051 if ((u_int)t >= nlinesw)
1053 if (t != tp->t_line) {
1055 (*linesw[tp->t_line].l_close)(tp, flag);
1056 error = (*linesw[t].l_open)(device, tp);
1058 (void)(*linesw[tp->t_line].l_open)(device, tp);
1067 case TIOCSTART: /* start output, like ^Q */
1069 if (ISSET(tp->t_state, TS_TTSTOP) ||
1070 ISSET(tp->t_lflag, FLUSHO)) {
1071 CLR(tp->t_lflag, FLUSHO);
1072 CLR(tp->t_state, TS_TTSTOP);
1077 case TIOCSTI: /* simulate terminal input */
1078 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
1080 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
1083 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1086 case TIOCSTOP: /* stop output, like ^S */
1088 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1089 SET(tp->t_state, TS_TTSTOP);
1090 (*tp->t_stop)(tp, 0);
1094 case TIOCSCTTY: /* become controlling tty */
1095 /* Session ctty vnode pointer set in vnode layer. */
1096 if (!SESS_LEADER(p) ||
1097 ((p->p_session->s_ttyvp || tp->t_session) &&
1098 (tp->t_session != p->p_session)))
1100 tp->t_session = p->p_session;
1101 tp->t_pgrp = p->p_pgrp;
1102 p->p_session->s_ttyp = tp;
1103 p->p_flag |= P_CONTROLT;
1105 case TIOCSPGRP: { /* set pgrp of tty */
1106 struct pgrp *pgrp = pgfind(*(int *)data);
1110 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1115 case TIOCSTAT: /* simulate control-T */
1120 case TIOCSWINSZ: /* set window size */
1121 if (bcmp((caddr_t)&tp->t_winsize, data,
1122 sizeof (struct winsize))) {
1123 tp->t_winsize = *(struct winsize *)data;
1124 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1127 case TIOCSDRAINWAIT:
1128 error = priv_check(td, PRIV_ROOT);
1131 tp->t_timeout = *(int *)data * hz;
1132 wakeup(TSA_OCOMPLETE(tp));
1133 wakeup(TSA_OLOWAT(tp));
1135 case TIOCGDRAINWAIT:
1136 *(int *)data = tp->t_timeout / hz;
1139 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1140 return (ttcompat(tp, cmd, data, flag));
1149 ttypoll(struct dev_poll_args *ap)
1151 cdev_t dev = ap->a_head.a_dev;
1152 int events = ap->a_events;
1157 /* XXX used to return ENXIO, but that means true! */
1159 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1160 POLLWRNORM)) | POLLHUP;
1165 if (events & (POLLIN | POLLRDNORM)) {
1166 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1167 revents |= events & (POLLIN | POLLRDNORM);
1169 selrecord(curthread, &tp->t_rsel);
1171 if (events & (POLLOUT | POLLWRNORM)) {
1172 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1173 ISSET(tp->t_state, TS_CONNECTED))
1174 || ISSET(tp->t_state, TS_ZOMBIE))
1175 revents |= events & (POLLOUT | POLLWRNORM);
1177 selrecord(curthread, &tp->t_wsel);
1180 ap->a_events = revents;
1184 static struct filterops ttyread_filtops =
1185 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1186 static struct filterops ttywrite_filtops =
1187 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1190 ttykqfilter(struct dev_kqfilter_args *ap)
1192 cdev_t dev = ap->a_head.a_dev;
1193 struct knote *kn = ap->a_kn;
1194 struct tty *tp = dev->si_tty;
1195 struct klist *klist;
1198 switch (kn->kn_filter) {
1200 klist = &tp->t_rsel.si_note;
1201 kn->kn_fop = &ttyread_filtops;
1204 klist = &tp->t_wsel.si_note;
1205 kn->kn_fop = &ttywrite_filtops;
1212 kn->kn_hook = (caddr_t)dev;
1215 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1222 filt_ttyrdetach(struct knote *kn)
1224 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1227 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1232 filt_ttyread(struct knote *kn, long hint)
1234 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1236 kn->kn_data = ttnread(tp);
1237 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1238 kn->kn_flags |= EV_EOF;
1241 return (kn->kn_data > 0);
1245 filt_ttywdetach(struct knote *kn)
1247 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1250 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1255 filt_ttywrite(struct knote *kn, long hint)
1257 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1259 kn->kn_data = tp->t_outq.c_cc;
1260 if (ISSET(tp->t_state, TS_ZOMBIE))
1262 return (kn->kn_data <= tp->t_olowat &&
1263 ISSET(tp->t_state, TS_CONNECTED));
1267 * Must be called while in a critical section.
1270 ttnread(struct tty *tp)
1274 if (ISSET(tp->t_lflag, PENDIN))
1276 nread = tp->t_canq.c_cc;
1277 if (!ISSET(tp->t_lflag, ICANON)) {
1278 nread += tp->t_rawq.c_cc;
1279 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1286 * Wait for output to drain.
1289 ttywait(struct tty *tp)
1295 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1296 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1298 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1299 ISSET(tp->t_state, TS_CONNECTED)) {
1300 SET(tp->t_state, TS_SO_OCOMPLETE);
1301 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1305 if (error == EWOULDBLOCK)
1312 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1319 * Flush if successfully wait.
1322 ttywflush(struct tty *tp)
1326 if ((error = ttywait(tp)) == 0)
1327 ttyflush(tp, FREAD);
1332 * Flush tty read and/or write queues, notifying anyone waiting.
1335 ttyflush(struct tty *tp, int rw)
1342 FLUSHQ(&tp->t_outq);
1343 CLR(tp->t_state, TS_TTSTOP);
1345 (*tp->t_stop)(tp, rw);
1347 FLUSHQ(&tp->t_canq);
1348 FLUSHQ(&tp->t_rawq);
1349 CLR(tp->t_lflag, PENDIN);
1352 CLR(tp->t_state, TS_LOCAL);
1354 if (ISSET(tp->t_state, TS_TBLOCK)) {
1356 FLUSHQ(&tp->t_outq);
1360 * Don't let leave any state that might clobber the
1361 * next line discipline (although we should do more
1362 * to send the START char). Not clearing the state
1363 * may have caused the "putc to a clist with no
1364 * reserved cblocks" panic/kprintf.
1366 CLR(tp->t_state, TS_TBLOCK);
1368 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1369 if (ISSET(tp->t_iflag, IXOFF)) {
1371 * XXX wait a bit in the hope that the stop
1372 * character (if any) will go out. Waiting
1373 * isn't good since it allows races. This
1374 * will be fixed when the stop character is
1375 * put in a special queue. Don't bother with
1376 * the checks in ttywait() since the timeout
1379 SET(tp->t_state, TS_SO_OCOMPLETE);
1380 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1383 * Don't try sending the stop character again.
1385 CLR(tp->t_state, TS_TBLOCK);
1392 FLUSHQ(&tp->t_outq);
1399 * Copy in the default termios characters.
1402 termioschars(struct termios *t)
1405 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1412 ttychars(struct tty *tp)
1415 termioschars(&tp->t_termios);
1419 * Handle input high water. Send stop character for the IXOFF case. Turn
1420 * on our input flow control bit and propagate the changes to the driver.
1421 * XXX the stop character should be put in a special high priority queue.
1424 ttyblock(struct tty *tp)
1427 SET(tp->t_state, TS_TBLOCK);
1428 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1429 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1430 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1435 * Handle input low water. Send start character for the IXOFF case. Turn
1436 * off our input flow control bit and propagate the changes to the driver.
1437 * XXX the start character should be put in a special high priority queue.
1440 ttyunblock(struct tty *tp)
1443 CLR(tp->t_state, TS_TBLOCK);
1444 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1445 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1446 SET(tp->t_state, TS_TBLOCK); /* try again later */
1451 /* Not used by any current (i386) drivers. */
1453 * Restart after an inter-char delay.
1456 ttrstrt(void *tp_arg)
1460 KASSERT(tp_arg != NULL, ("ttrstrt"));
1464 CLR(tp->t_state, TS_TIMEOUT);
1471 ttstart(struct tty *tp)
1474 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1480 * "close" a line discipline
1483 ttylclose(struct tty *tp, int flag)
1486 if (flag & FNONBLOCK || ttywflush(tp))
1487 ttyflush(tp, FREAD | FWRITE);
1492 * Handle modem control transition on a tty.
1493 * Flag indicates new state of carrier.
1494 * Returns 0 if the line should be turned off, otherwise 1.
1497 ttymodem(struct tty *tp, int flag)
1500 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1502 * MDMBUF: do flow control according to carrier flag
1503 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1504 * works if IXON and IXANY are clear.
1507 CLR(tp->t_state, TS_CAR_OFLOW);
1508 CLR(tp->t_state, TS_TTSTOP);
1510 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1511 SET(tp->t_state, TS_CAR_OFLOW);
1512 SET(tp->t_state, TS_TTSTOP);
1513 (*tp->t_stop)(tp, 0);
1515 } else if (flag == 0) {
1519 CLR(tp->t_state, TS_CARR_ON);
1520 if (ISSET(tp->t_state, TS_ISOPEN) &&
1521 !ISSET(tp->t_cflag, CLOCAL)) {
1522 SET(tp->t_state, TS_ZOMBIE);
1523 CLR(tp->t_state, TS_CONNECTED);
1524 if (tp->t_session && tp->t_session->s_leader)
1525 ksignal(tp->t_session->s_leader, SIGHUP);
1526 ttyflush(tp, FREAD | FWRITE);
1533 SET(tp->t_state, TS_CARR_ON);
1534 if (!ISSET(tp->t_state, TS_ZOMBIE))
1535 SET(tp->t_state, TS_CONNECTED);
1536 wakeup(TSA_CARR_ON(tp));
1544 * Reinput pending characters after state switch
1545 * call from a critical section.
1548 ttypend(struct tty *tp)
1553 CLR(tp->t_lflag, PENDIN);
1554 SET(tp->t_state, TS_TYPEN);
1556 * XXX this assumes too much about clist internals. It may even
1557 * fail if the cblock slush pool is empty. We can't allocate more
1558 * cblocks here because we are called from an interrupt handler
1559 * and clist_alloc_cblocks() can wait.
1562 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1563 tp->t_rawq.c_cbmax = tq.c_cbmax;
1564 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1565 while ((c = clist_getc(&tq)) >= 0)
1567 CLR(tp->t_state, TS_TYPEN);
1571 * Process a read call on a tty device.
1574 ttread(struct tty *tp, struct uio *uio, int flag)
1579 cc_t *cc = tp->t_cc;
1582 int first, error = 0;
1583 int has_stime = 0, last_cc = 0;
1584 long slp = 0; /* XXX this should be renamed `timo'. */
1585 struct timeval stime;
1587 lp = curthread->td_lwp;
1591 lflag = tp->t_lflag;
1593 * take pending input first
1595 if (ISSET(lflag, PENDIN)) {
1597 splz(); /* reduce latency */
1598 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1602 * Hang process if it's in the background.
1604 if ((pp = curproc) && isbackground(pp, tp)) {
1606 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1607 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1608 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1610 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1611 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1617 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1619 return (0); /* EOF */
1623 * If canonical, use the canonical queue,
1624 * else use the raw queue.
1626 * (should get rid of clists...)
1628 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1630 if (flag & IO_NDELAY) {
1633 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1638 return (EWOULDBLOCK);
1640 if (!ISSET(lflag, ICANON)) {
1643 struct timeval timecopy;
1646 * Check each of the four combinations.
1647 * (m > 0 && t == 0) is the normal read case.
1648 * It should be fairly efficient, so we check that and its
1649 * companion case (m == 0 && t == 0) first.
1650 * For the other two cases, we compute the target sleep time
1659 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1663 t *= 100000; /* time in us */
1664 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1665 ((t1).tv_usec - (t2).tv_usec))
1671 getmicrotime(&timecopy);
1673 /* first character, start timer */
1677 } else if (qp->c_cc > last_cc) {
1678 /* got a character, restart timer */
1682 /* nothing, check expiration */
1683 slp = t - diff(timecopy, stime);
1688 } else { /* m == 0 */
1691 getmicrotime(&timecopy);
1697 slp = t - diff(timecopy, stime);
1699 /* Timed out, but 0 is enough input. */
1707 * Rounding down may make us wake up just short
1708 * of the target, so we round up.
1709 * The formula is ceiling(slp * hz/1000000).
1710 * 32-bit arithmetic is enough for hz < 169.
1711 * XXX see tvtohz() for how to avoid overflow if hz
1712 * is large (divide by `tick' and/or arrange to
1713 * use tvtohz() if hz is large).
1715 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1718 if (qp->c_cc <= 0) {
1721 * There is no input, or not enough input and we can block.
1723 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1724 ISSET(tp->t_state, TS_CONNECTED) ?
1725 "ttyin" : "ttyhup", (int)slp);
1727 if (error == EWOULDBLOCK)
1732 * XXX what happens if another process eats some input
1733 * while we are asleep (not just here)? It would be
1734 * safest to detect changes and reset our state variables
1735 * (has_stime and last_cc).
1743 * Input present, check for input mapping and processing.
1746 if (ISSET(lflag, ICANON | ISIG))
1752 icc = imin(uio->uio_resid, IBUFSIZ);
1753 icc = q_to_b(qp, ibuf, icc);
1759 error = uiomove(ibuf, icc, uio);
1761 * XXX if there was an error then we should ungetc() the
1762 * unmoved chars and reduce icc here.
1766 if (uio->uio_resid == 0)
1780 * delayed suspend (^Y)
1782 if (CCEQ(cc[VDSUSP], c) &&
1783 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1784 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1786 error = ttysleep(tp, &lbolt, PCATCH,
1795 * Interpret EOF only in canonical mode.
1797 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1800 * Give user character.
1802 error = ureadc(c, uio);
1804 /* XXX should ungetc(c, qp). */
1806 if (uio->uio_resid == 0)
1809 * In canonical mode check for a "break character"
1810 * marking the end of a "line of input".
1812 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1819 * Look to unblock input now that (presumably)
1820 * the input queue has gone down.
1823 if (ISSET(tp->t_state, TS_TBLOCK) &&
1824 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1832 * Check the output queue on tp for space for a kernel message (from uprintf
1833 * or tprintf). Allow some space over the normal hiwater mark so we don't
1834 * lose messages due to normal flow control, but don't let the tty run amok.
1835 * Sleeps here are not interruptible, but we return prematurely if new signals
1839 ttycheckoutq(struct tty *tp, int wait)
1841 struct lwp *lp = curthread->td_lwp;
1843 sigset_t oldset, newset;
1845 hiwat = tp->t_ohiwat;
1846 SIGEMPTYSET(oldset);
1847 SIGEMPTYSET(newset);
1850 oldset = lwp_sigpend(lp);
1851 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1852 while (tp->t_outq.c_cc > hiwat) {
1854 if (tp->t_outq.c_cc <= hiwat)
1857 newset = lwp_sigpend(lp);
1858 if (!wait || SIGSETNEQ(oldset, newset)) {
1862 SET(tp->t_state, TS_SO_OLOWAT);
1863 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1871 * Process a write call on a tty device.
1874 ttwrite(struct tty *tp, struct uio *uio, int flag)
1880 int i, hiwat, cnt, error;
1883 lp = curthread->td_lwp;
1884 hiwat = tp->t_ohiwat;
1885 cnt = uio->uio_resid;
1890 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1892 if (uio->uio_resid == cnt)
1896 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1897 if (flag & IO_NDELAY) {
1899 error = EWOULDBLOCK;
1902 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1911 * Hang the process if it's in the background.
1913 if ((pp = curproc) && isbackground(pp, tp) &&
1914 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1915 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1916 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1917 if (pp->p_pgrp->pg_jobc == 0) {
1921 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1922 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1928 * Process the user's data in at most OBUFSIZ chunks. Perform any
1929 * output translation. Keep track of high water mark, sleep on
1930 * overflow awaiting device aid in acquiring new space.
1932 while (uio->uio_resid > 0 || cc > 0) {
1933 if (ISSET(tp->t_lflag, FLUSHO)) {
1937 if (tp->t_outq.c_cc > hiwat)
1940 * Grab a hunk of data from the user, unless we have some
1941 * leftover from last time.
1944 cc = imin(uio->uio_resid, OBUFSIZ);
1946 error = uiomove(cp, cc, uio);
1953 * If nothing fancy need be done, grab those characters we
1954 * can handle without any of ttyoutput's processing and
1955 * just transfer them to the output q. For those chars
1956 * which require special processing (as indicated by the
1957 * bits in char_type), call ttyoutput. After processing
1958 * a hunk of data, look for FLUSHO so ^O's will take effect
1962 if (!ISSET(tp->t_oflag, OPOST))
1965 ce = cc - scanc((u_int)cc, (u_char *)cp,
1966 char_type, CCLASSMASK);
1968 * If ce is zero, then we're processing
1969 * a special character through ttyoutput.
1973 if (ttyoutput(*cp, tp) >= 0) {
1974 /* No Clists, wait a bit. */
1976 if (flag & IO_NDELAY) {
1977 error = EWOULDBLOCK;
1980 error = ttysleep(tp, &lbolt,
1989 if (ISSET(tp->t_lflag, FLUSHO) ||
1990 tp->t_outq.c_cc > hiwat)
1996 * A bunch of normal characters have been found.
1997 * Transfer them en masse to the output queue and
1998 * continue processing at the top of the loop.
1999 * If there are any further characters in this
2000 * <= OBUFSIZ chunk, the first should be a character
2001 * requiring special handling by ttyoutput.
2004 i = b_to_q(cp, ce, &tp->t_outq);
2007 cp += ce, cc -= ce, tk_nout += ce;
2010 /* No Clists, wait a bit. */
2012 if (flag & IO_NDELAY) {
2013 error = EWOULDBLOCK;
2016 error = ttysleep(tp, &lbolt, PCATCH,
2022 if (ISSET(tp->t_lflag, FLUSHO) ||
2023 tp->t_outq.c_cc > hiwat)
2030 * If cc is nonzero, we leave the uio structure inconsistent, as the
2031 * offset and iov pointers have moved forward, but it doesn't matter
2032 * (the call will either return short or restart with a new uio).
2034 uio->uio_resid += cc;
2041 * This can only occur if FLUSHO is set in t_lflag,
2042 * or if ttstart/oproc is synchronous (or very fast).
2044 if (tp->t_outq.c_cc <= hiwat) {
2048 if (flag & IO_NDELAY) {
2050 uio->uio_resid += cc;
2051 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2053 SET(tp->t_state, TS_SO_OLOWAT);
2054 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2056 if (error == EWOULDBLOCK)
2064 * Rubout one character from the rawq of tp
2065 * as cleanly as possible.
2068 ttyrub(int c, struct tty *tp)
2074 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2076 CLR(tp->t_lflag, FLUSHO);
2077 if (ISSET(tp->t_lflag, ECHOE)) {
2078 if (tp->t_rocount == 0) {
2080 * Screwed by ttwrite; retype
2085 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2088 CLR(c, ~TTY_CHARMASK);
2089 switch (CCLASS(c)) {
2098 if (ISSET(tp->t_lflag, ECHOCTL))
2102 if (tp->t_rocount < tp->t_rawq.c_cc) {
2107 savecol = tp->t_column;
2108 SET(tp->t_state, TS_CNTTB);
2109 SET(tp->t_lflag, FLUSHO);
2110 tp->t_column = tp->t_rocol;
2111 cp = tp->t_rawq.c_cf;
2113 tabc = *cp; /* XXX FIX NEXTC */
2114 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2116 CLR(tp->t_lflag, FLUSHO);
2117 CLR(tp->t_state, TS_CNTTB);
2120 /* savecol will now be length of the tab. */
2121 savecol -= tp->t_column;
2122 tp->t_column += savecol;
2124 savecol = 8; /* overflow screw */
2125 while (--savecol >= 0)
2126 (void)ttyoutput('\b', tp);
2129 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2130 (void)kprintf(PANICSTR, c, CCLASS(c));
2132 panic(PANICSTR, c, CCLASS(c));
2136 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2137 if (!ISSET(tp->t_state, TS_ERASE)) {
2138 SET(tp->t_state, TS_ERASE);
2139 (void)ttyoutput('\\', tp);
2143 ttyecho(tp->t_cc[VERASE], tp);
2145 * This code may be executed not only when an ERASE key
2146 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2147 * So, I didn't think it was worthwhile to pass the extra
2148 * information (which would need an extra parameter,
2149 * changing every call) needed to distinguish the ERASE2
2150 * case from the ERASE.
2157 * Back over cnt characters, erasing them.
2160 ttyrubo(struct tty *tp, int cnt)
2164 (void)ttyoutput('\b', tp);
2165 (void)ttyoutput(' ', tp);
2166 (void)ttyoutput('\b', tp);
2172 * Reprint the rawq line. Note, it is assumed that c_cc has already
2176 ttyretype(struct tty *tp)
2181 /* Echo the reprint character. */
2182 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2183 ttyecho(tp->t_cc[VREPRINT], tp);
2185 (void)ttyoutput('\n', tp);
2189 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2190 * BIT OF FIRST CHAR.
2193 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2194 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2196 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2197 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2199 CLR(tp->t_state, TS_ERASE);
2202 tp->t_rocount = tp->t_rawq.c_cc;
2207 * Echo a typed character to the terminal.
2210 ttyecho(int c, struct tty *tp)
2213 if (!ISSET(tp->t_state, TS_CNTTB))
2214 CLR(tp->t_lflag, FLUSHO);
2215 if ((!ISSET(tp->t_lflag, ECHO) &&
2216 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2217 ISSET(tp->t_lflag, EXTPROC))
2219 if (ISSET(tp->t_lflag, ECHOCTL) &&
2220 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2221 ISSET(c, TTY_CHARMASK) == 0177)) {
2222 (void)ttyoutput('^', tp);
2223 CLR(c, ~TTY_CHARMASK);
2229 (void)ttyoutput(c, tp);
2233 * Wake up any readers on a tty.
2236 ttwakeup(struct tty *tp)
2239 if (tp->t_rsel.si_pid != 0)
2240 selwakeup(&tp->t_rsel);
2241 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2242 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2243 wakeup(TSA_HUP_OR_INPUT(tp));
2244 KNOTE(&tp->t_rsel.si_note, 0);
2248 * Wake up any writers on a tty.
2251 ttwwakeup(struct tty *tp)
2254 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2255 selwakeup(&tp->t_wsel);
2256 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2257 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2258 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2259 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2260 CLR(tp->t_state, TS_SO_OCOMPLETE);
2261 wakeup(TSA_OCOMPLETE(tp));
2263 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2264 tp->t_outq.c_cc <= tp->t_olowat) {
2265 CLR(tp->t_state, TS_SO_OLOWAT);
2266 wakeup(TSA_OLOWAT(tp));
2268 KNOTE(&tp->t_wsel.si_note, 0);
2272 * Look up a code for a specified speed in a conversion table;
2273 * used by drivers to map software speed values to hardware parameters.
2276 ttspeedtab(int speed, struct speedtab *table)
2279 for ( ; table->sp_speed != -1; table++)
2280 if (table->sp_speed == speed)
2281 return (table->sp_code);
2286 * Set input and output watermarks and buffer sizes. For input, the
2287 * high watermark is about one second's worth of input above empty, the
2288 * low watermark is slightly below high water, and the buffer size is a
2289 * driver-dependent amount above high water. For output, the watermarks
2290 * are near the ends of the buffer, with about 1 second's worth of input
2291 * between them. All this only applies to the standard line discipline.
2294 ttsetwater(struct tty *tp)
2296 int cps, ttmaxhiwat, x;
2299 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2300 switch (tp->t_ispeedwat) {
2302 cps = tp->t_ispeed / 10;
2306 * This case is for old drivers that don't know about
2307 * t_ispeedwat. Arrange for them to get the old buffer
2308 * sizes and watermarks.
2310 cps = TTYHOG - 2 * 256;
2311 tp->t_ififosize = 2 * 2048;
2314 cps = tp->t_ispeedwat / 10;
2318 tp->t_ilowat = 7 * cps / 8;
2319 x = cps + tp->t_ififosize;
2320 clist_alloc_cblocks(&tp->t_rawq, x, x);
2323 switch (tp->t_ospeedwat) {
2325 cps = tp->t_ospeed / 10;
2326 ttmaxhiwat = 2 * TTMAXHIWAT;
2329 cps = tp->t_ospeed / 10;
2330 ttmaxhiwat = TTMAXHIWAT;
2333 cps = tp->t_ospeedwat / 10;
2334 ttmaxhiwat = 8 * TTMAXHIWAT;
2337 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2338 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2340 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2341 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2342 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2344 clist_alloc_cblocks(&tp->t_outq, x, x);
2349 * Report on state of foreground process group.
2352 ttyinfo(struct tty *tp)
2354 struct proc *p, *pick;
2359 if (ttycheckoutq(tp,0) == 0)
2363 * We always print the load average, then figure out what else to
2364 * print based on the state of the current process group.
2366 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2367 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2369 if (tp->t_session == NULL) {
2370 ttyprintf(tp, "not a controlling terminal\n");
2371 } else if (tp->t_pgrp == NULL) {
2372 ttyprintf(tp, "no foreground process group\n");
2373 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2374 ttyprintf(tp, "empty foreground process group\n");
2377 * Pick an interesting process. Note that certain elements,
2378 * in particular the wmesg, require a critical section for
2379 * safe access (YYY and we are still not MP safe).
2381 * 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");
2407 * Figure out what wait/process-state message, and command
2411 * XXX lwp This is a horrible mixture. We need to rework this
2412 * as soon as lwps have their own runnable status.
2414 if (pick->p_flag & P_WEXIT)
2416 else if (lp->lwp_stat == LSRUN)
2418 else if (pick->p_stat == SIDL)
2420 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2421 str = lp->lwp_wmesg;
2425 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2426 pick->p_comm, pick->p_pid, str);
2429 * Calculate cpu usage, percent cpu, and cmsz. Note that
2430 * 'pick' becomes invalid the moment we exit the critical
2433 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2434 calcru_proc(pick, &ru);
2436 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2438 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2441 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2448 ttyprintf(tp, " %s ", buf);
2449 ttyprintf(tp, "%ld.%02ldu ",
2450 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2451 ttyprintf(tp, "%ld.%02lds ",
2452 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2453 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2455 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2459 * Returns 1 if p2 is "better" than p1
2461 * The algorithm for picking the "interesting" process is thus:
2463 * 1) Only foreground processes are eligible - implied.
2464 * 2) Runnable processes are favored over anything else. The runner
2465 * with the highest cpu utilization is picked (p_cpticks). Ties are
2466 * broken by picking the highest pid.
2467 * 3) The sleeper with the shortest sleep time is next. With ties,
2468 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2469 * 4) Further ties are broken by picking the highest pid.
2471 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2472 #define TESTAB(a, b) ((a)<<1 | (b))
2478 proc_compare(struct proc *p1, struct proc *p2)
2480 struct lwp *lp1, *lp2;
2487 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2493 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2497 lp1 = FIRST_LWP_IN_PROC(p1);
2498 lp2 = FIRST_LWP_IN_PROC(p2);
2501 * see if at least one of them is runnable
2503 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2510 * tie - favor one with highest recent cpu utilization
2512 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2514 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2516 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2519 * pick the one with the smallest sleep time
2521 if (lp2->lwp_slptime > lp1->lwp_slptime)
2523 if (lp1->lwp_slptime > lp2->lwp_slptime)
2526 * favor one sleeping in a non-interruptible sleep
2528 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2530 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2532 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2536 * Output char to tty; console putchar style.
2539 tputchar(int c, struct tty *tp)
2542 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2547 (void)ttyoutput('\r', tp);
2548 (void)ttyoutput(c, tp);
2555 * Sleep on chan, returning ERESTART if tty changed while we napped and
2556 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2557 * the tty is revoked, restarting a pending call will redo validation done
2558 * at the start of the call.
2561 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2567 error = tsleep(chan, slpflags, wmesg, timo);
2570 return (tp->t_gen == gen ? 0 : ERESTART);
2574 * Allocate a tty struct. Clists in the struct will be allocated by
2578 ttymalloc(struct tty *tp)
2583 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2590 * Free a tty struct. Clists in the struct should have been freed by
2593 * XXX not yet usable: since we support a half-closed state and do not
2594 * ref count the tty reference from the session, it is possible for a
2595 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2598 ttyfree(struct tty *tp)
2605 ttyregister(struct tty *tp)
2607 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2611 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2615 SLIST_FOREACH(tp, &tty_list, t_list) {
2618 t.t_dev = (cdev_t)dev2udev(t.t_dev);
2619 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2626 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2627 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2630 nottystop(struct tty *tp, int rw)
2637 ttyread(struct dev_read_args *ap)
2641 tp = ap->a_head.a_dev->si_tty;
2644 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2648 ttywrite(struct dev_write_args *ap)
2652 tp = ap->a_head.a_dev->si_tty;
2655 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));