2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
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34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.21 2006/04/03 21:32:23 dillon Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
83 #include <sys/clist.h>
85 #include <sys/fcntl.h>
87 #include <sys/dkstat.h>
89 #include <sys/kernel.h>
90 #include <sys/vnode.h>
91 #include <sys/signalvar.h>
92 #include <sys/resourcevar.h>
93 #include <sys/malloc.h>
94 #include <sys/filedesc.h>
95 #include <sys/sysctl.h>
96 #include <sys/thread2.h>
101 #include <vm/vm_map.h>
103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105 static int proc_compare (struct proc *p1, struct proc *p2);
106 static int ttnread (struct tty *tp);
107 static void ttyecho (int c, struct tty *tp);
108 static int ttyoutput (int c, struct tty *tp);
109 static void ttypend (struct tty *tp);
110 static void ttyretype (struct tty *tp);
111 static void ttyrub (int c, struct tty *tp);
112 static void ttyrubo (struct tty *tp, int cnt);
113 static void ttyunblock (struct tty *tp);
114 static int ttywflush (struct tty *tp);
115 static int filt_ttyread (struct knote *kn, long hint);
116 static void filt_ttyrdetach (struct knote *kn);
117 static int filt_ttywrite (struct knote *kn, long hint);
118 static void filt_ttywdetach (struct knote *kn);
121 * Table with character classes and parity. The 8th bit indicates parity,
122 * the 7th bit indicates the character is an alphameric or underscore (for
123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
124 * are 0 then the character needs no special processing on output; classes
125 * other than 0 might be translated or (not currently) require delays.
127 #define E 0x00 /* Even parity. */
128 #define O 0x80 /* Odd parity. */
129 #define PARITY(c) (char_type[c] & O)
131 #define ALPHA 0x40 /* Alpha or underscore. */
132 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
134 #define CCLASSMASK 0x3f
135 #define CCLASS(c) (char_type[c] & CCLASSMASK)
140 #define NA ORDINARY | ALPHA
146 static u_char const char_type[] = {
147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
164 * Meta chars; should be settable per character set;
165 * for now, treat them all as normal characters.
167 NA, NA, NA, NA, NA, NA, NA, NA,
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
193 /* Macros to clear/set/test flags. */
194 #define SET(t, f) (t) |= (f)
195 #define CLR(t, f) (t) &= ~(f)
196 #define ISSET(t, f) ((t) & (f))
198 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
199 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
202 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
203 "LU", "TTY input statistic");
205 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
206 "LU", "TTY output statistic");
210 * list of struct tty where pstat(8) can pick it up with sysctl
212 static SLIST_HEAD(, tty) tty_list;
215 * Initial open of tty, or (re)entry to standard tty line discipline.
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.
248 funsetown(tp->t_sigio);
253 ttyflush(tp, FREAD | FWRITE);
254 clist_free_cblocks(&tp->t_canq);
255 clist_free_cblocks(&tp->t_outq);
256 clist_free_cblocks(&tp->t_rawq);
259 tp->t_line = TTYDISC;
267 * Disassociate the tty from its session. Traditionally this has only been
268 * a half-close, meaning that the session was still allowed to point at the
269 * tty (resulting in the tty in the ps command showing something like 'p0-'),
270 * even though the tty is no longer pointing at the session.
272 * The half close seems to be useful only for 'ps' output but there is as
273 * yet no reason to remove the feature. The full-close code is currently
274 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
277 ttyclearsession(struct tty *tp)
282 if ((sp = tp->t_session) != NULL) {
283 tp->t_session = NULL;
284 #ifdef TTY_DO_FULL_CLOSE
285 /* FULL CLOSE (not yet) */
286 if (sp->s_ttyp == tp) {
289 printf("ttyclearsession: warning: sp->s_ttyp != tp "
290 "%p/%p\n", sp->s_ttyp, tp);
297 * Terminate the tty vnode association for a session. This is the
298 * 'other half' of the close. Because multiple opens of /dev/tty
299 * only generate a single open to the actual tty, the file modes
300 * are locked to FREAD|FWRITE.
303 ttyclosesession(struct session *sp, int dorele)
306 struct thread *td = curthread;
308 if ((vp = sp->s_ttyvp) == NULL)
311 if (vp->v_flag & VCTTYISOPEN) {
312 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td) == 0) {
313 vclrflags(vp, VCTTYISOPEN);
314 VOP_CLOSE(vp, FREAD|FWRITE, td);
315 VOP_UNLOCK(vp, 0, td);
323 #define FLUSHQ(q) { \
325 ndflush(q, (q)->c_cc); \
328 /* Is 'c' a line delimiter ("break" character)? */
329 #define TTBREAKC(c, lflag) \
330 ((c) == '\n' || (((c) == cc[VEOF] || \
331 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
332 (c) != _POSIX_VDISABLE))
335 * Process input of a single character received on a tty.
342 tcflag_t iflag, lflag;
347 * If input is pending take it first.
350 if (ISSET(lflag, PENDIN))
355 if (ISSET(lflag, ICANON))
362 * Block further input iff:
363 * current input > threshold AND input is available to user program
364 * AND input flow control is enabled and not yet invoked.
365 * The 3 is slop for PARMRK.
368 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
369 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
370 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
371 !ISSET(tp->t_state, TS_TBLOCK))
374 /* Handle exceptional conditions (break, parity, framing). */
376 err = (ISSET(c, TTY_ERRORMASK));
378 CLR(c, TTY_ERRORMASK);
379 if (ISSET(err, TTY_BI)) {
380 if (ISSET(iflag, IGNBRK))
382 if (ISSET(iflag, BRKINT)) {
383 ttyflush(tp, FREAD | FWRITE);
384 pgsignal(tp->t_pgrp, SIGINT, 1);
387 if (ISSET(iflag, PARMRK))
389 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
390 || ISSET(err, TTY_FE)) {
391 if (ISSET(iflag, IGNPAR))
393 else if (ISSET(iflag, PARMRK)) {
395 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
398 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
399 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
400 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
407 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
409 if (!ISSET(lflag, EXTPROC)) {
411 * Check for literal nexting very first
413 if (ISSET(tp->t_state, TS_LNCH)) {
415 CLR(tp->t_state, TS_LNCH);
418 * Scan for special characters. This code
419 * is really just a big case statement with
420 * non-constant cases. The bottom of the
421 * case statement is labeled ``endcase'', so goto
422 * it after a case match, or similar.
426 * Control chars which aren't controlled
427 * by ICANON, ISIG, or IXON.
429 if (ISSET(lflag, IEXTEN)) {
430 if (CCEQ(cc[VLNEXT], c)) {
431 if (ISSET(lflag, ECHO)) {
432 if (ISSET(lflag, ECHOE)) {
433 (void)ttyoutput('^', tp);
434 (void)ttyoutput('\b', tp);
438 SET(tp->t_state, TS_LNCH);
441 if (CCEQ(cc[VDISCARD], c)) {
442 if (ISSET(lflag, FLUSHO))
443 CLR(tp->t_lflag, FLUSHO);
445 ttyflush(tp, FWRITE);
447 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
449 SET(tp->t_lflag, FLUSHO);
457 if (ISSET(lflag, ISIG)) {
458 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
459 if (!ISSET(lflag, NOFLSH))
460 ttyflush(tp, FREAD | FWRITE);
463 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
466 if (CCEQ(cc[VSUSP], c)) {
467 if (!ISSET(lflag, NOFLSH))
470 pgsignal(tp->t_pgrp, SIGTSTP, 1);
475 * Handle start/stop characters.
477 if (ISSET(iflag, IXON)) {
478 if (CCEQ(cc[VSTOP], c)) {
479 if (!ISSET(tp->t_state, TS_TTSTOP)) {
480 SET(tp->t_state, TS_TTSTOP);
481 (*tp->t_stop)(tp, 0);
484 if (!CCEQ(cc[VSTART], c))
487 * if VSTART == VSTOP then toggle
491 if (CCEQ(cc[VSTART], c))
495 * IGNCR, ICRNL, & INLCR
498 if (ISSET(iflag, IGNCR))
500 else if (ISSET(iflag, ICRNL))
502 } else if (c == '\n' && ISSET(iflag, INLCR))
505 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
507 * From here on down canonical mode character
508 * processing takes place.
511 * erase or erase2 (^H / ^?)
513 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
515 ttyrub(unputc(&tp->t_rawq), tp);
521 if (CCEQ(cc[VKILL], c)) {
522 if (ISSET(lflag, ECHOKE) &&
523 tp->t_rawq.c_cc == tp->t_rocount &&
524 !ISSET(lflag, ECHOPRT))
525 while (tp->t_rawq.c_cc)
526 ttyrub(unputc(&tp->t_rawq), tp);
529 if (ISSET(lflag, ECHOK) ||
530 ISSET(lflag, ECHOKE))
535 CLR(tp->t_state, TS_LOCAL);
541 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
547 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
552 * erase last char of word and remember the
553 * next chars type (for ALTWERASE)
556 c = unputc(&tp->t_rawq);
559 if (c == ' ' || c == '\t') {
560 (void)putc(c, &tp->t_rawq);
569 c = unputc(&tp->t_rawq);
572 } while (c != ' ' && c != '\t' &&
573 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
574 (void)putc(c, &tp->t_rawq);
580 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
585 * ^T - kernel info and generate SIGINFO
587 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
588 if (ISSET(lflag, ISIG))
589 pgsignal(tp->t_pgrp, SIGINFO, 1);
590 if (!ISSET(lflag, NOKERNINFO))
594 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
595 if (ISSET(lflag, ISIG))
596 pgsignal(tp->t_pgrp, SIGCKPT, 1);
601 * Check for input buffer overflow
603 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
605 if (ISSET(iflag, IMAXBEL)) {
606 if (tp->t_outq.c_cc < tp->t_ohiwat)
607 (void)ttyoutput(CTRL('g'), tp);
612 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
613 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
614 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
617 * Put data char in q for user and
618 * wakeup on seeing a line delimiter.
620 if (putc(c, &tp->t_rawq) >= 0) {
621 if (!ISSET(lflag, ICANON)) {
626 if (TTBREAKC(c, lflag)) {
628 catq(&tp->t_rawq, &tp->t_canq);
630 } else if (tp->t_rocount++ == 0)
631 tp->t_rocol = tp->t_column;
632 if (ISSET(tp->t_state, TS_ERASE)) {
634 * end of prterase \.../
636 CLR(tp->t_state, TS_ERASE);
637 (void)ttyoutput('/', tp);
641 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
643 * Place the cursor over the '^' of the ^D.
645 i = imin(2, tp->t_column - i);
647 (void)ttyoutput('\b', tp);
654 * IXANY means allow any character to restart output.
656 if (ISSET(tp->t_state, TS_TTSTOP) &&
657 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
660 CLR(tp->t_lflag, FLUSHO);
661 CLR(tp->t_state, TS_TTSTOP);
663 return (ttstart(tp));
667 * Output a single character on a tty, doing output processing
668 * as needed (expanding tabs, newline processing, etc.).
669 * Returns < 0 if succeeds, otherwise returns char to resend.
681 if (!ISSET(oflag, OPOST)) {
682 if (ISSET(tp->t_lflag, FLUSHO))
684 if (putc(c, &tp->t_outq))
691 * Do tab expansion if OXTABS is set. Special case if we external
692 * processing, we don't do the tab expansion because we'll probably
693 * get it wrong. If tab expansion needs to be done, let it happen
696 CLR(c, ~TTY_CHARMASK);
698 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
699 c = 8 - (tp->t_column & 7);
700 if (!ISSET(tp->t_lflag, FLUSHO)) {
701 crit_enter(); /* Don't interrupt tabs. */
702 c -= b_to_q(" ", c, &tp->t_outq);
708 return (c ? -1 : '\t');
710 if (c == CEOT && ISSET(oflag, ONOEOT))
714 * Newline translation: if ONLCR is set,
715 * translate newline into "\r\n".
717 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
720 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
723 /* If OCRNL is set, translate "\r" into "\n". */
724 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
726 /* If ONOCR is set, don't transmit CRs when on column 0. */
727 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
732 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
744 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
754 col = (col + 8) & ~7;
762 * Ioctls for all tty devices. Called after line-discipline specific ioctl
763 * has been called to do discipline-specific functions and/or reject any
764 * of these ioctl commands.
768 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
770 struct thread *td = curthread;
771 struct proc *p = td->td_proc;
776 /* If the ioctl involves modification, hang if in the background. */
800 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
810 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
811 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
812 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
813 if (p->p_pgrp->pg_jobc == 0)
815 pgsignal(p->p_pgrp, SIGTTOU, 1);
816 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
824 switch (cmd) { /* Process the ioctl. */
825 case FIOASYNC: /* set/clear async i/o */
828 SET(tp->t_state, TS_ASYNC);
830 CLR(tp->t_state, TS_ASYNC);
833 case FIONBIO: /* set/clear non-blocking i/o */
834 break; /* XXX: delete. */
835 case FIONREAD: /* get # bytes to read */
837 *(int *)data = ttnread(tp);
843 * Policy -- Don't allow FIOSETOWN on someone else's
846 if (tp->t_session != NULL && !isctty(p, tp))
849 error = fsetown(*(int *)data, &tp->t_sigio);
854 if (tp->t_session != NULL && !isctty(p, tp))
856 *(int *)data = fgetown(tp->t_sigio);
859 case TIOCEXCL: /* set exclusive use of tty */
861 SET(tp->t_state, TS_XCLUDE);
864 case TIOCFLUSH: { /* flush buffers */
865 int flags = *(int *)data;
868 flags = FREAD | FWRITE;
870 flags &= FREAD | FWRITE;
874 case TIOCCONS: /* become virtual console */
876 if (constty && constty != tp &&
877 ISSET(constty->t_state, TS_CONNECTED))
880 if ((error = suser(td)) != 0)
884 } else if (tp == constty)
887 case TIOCDRAIN: /* wait till output drained */
892 case TIOCGETA: { /* get termios struct */
893 struct termios *t = (struct termios *)data;
895 bcopy(&tp->t_termios, t, sizeof(struct termios));
898 case TIOCGETD: /* get line discipline */
899 *(int *)data = tp->t_line;
901 case TIOCGWINSZ: /* get window size */
902 *(struct winsize *)data = tp->t_winsize;
904 case TIOCGPGRP: /* get pgrp of tty */
907 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
910 case TIOCHPCL: /* hang up on last close */
912 SET(tp->t_cflag, HUPCL);
916 case TIOCNXCL: /* reset exclusive use of tty */
918 CLR(tp->t_state, TS_XCLUDE);
921 case TIOCOUTQ: /* output queue size */
922 *(int *)data = tp->t_outq.c_cc;
924 case TIOCSETA: /* set termios struct */
925 case TIOCSETAW: /* drain output, set */
926 case TIOCSETAF: { /* drn out, fls in, set */
927 struct termios *t = (struct termios *)data;
929 if (t->c_ispeed == 0)
930 t->c_ispeed = t->c_ospeed;
931 if (t->c_ispeed == 0)
932 t->c_ispeed = tp->t_ospeed;
933 if (t->c_ispeed == 0)
936 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
942 if (cmd == TIOCSETAF)
945 if (!ISSET(t->c_cflag, CIGNORE)) {
947 * Set device hardware.
949 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
953 if (ISSET(t->c_cflag, CLOCAL) &&
954 !ISSET(tp->t_cflag, CLOCAL)) {
956 * XXX disconnections would be too hard to
957 * get rid of without this kludge. The only
958 * way to get rid of controlling terminals
959 * is to exit from the session leader.
961 CLR(tp->t_state, TS_ZOMBIE);
963 wakeup(TSA_CARR_ON(tp));
967 if ((ISSET(tp->t_state, TS_CARR_ON) ||
968 ISSET(t->c_cflag, CLOCAL)) &&
969 !ISSET(tp->t_state, TS_ZOMBIE))
970 SET(tp->t_state, TS_CONNECTED);
972 CLR(tp->t_state, TS_CONNECTED);
973 tp->t_cflag = t->c_cflag;
974 tp->t_ispeed = t->c_ispeed;
975 if (t->c_ospeed != 0)
976 tp->t_ospeed = t->c_ospeed;
979 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
981 if (ISSET(t->c_lflag, ICANON))
982 SET(tp->t_lflag, PENDIN);
985 * XXX we really shouldn't allow toggling
986 * ICANON while we're in a non-termios line
987 * discipline. Now we have to worry about
988 * panicing for a null queue.
990 if (tp->t_canq.c_cbreserved > 0 &&
991 tp->t_rawq.c_cbreserved > 0) {
992 catq(&tp->t_rawq, &tp->t_canq);
994 * XXX the queue limits may be
995 * different, so the old queue
996 * swapping method no longer works.
998 catq(&tp->t_canq, &tp->t_rawq);
1000 CLR(tp->t_lflag, PENDIN);
1004 tp->t_iflag = t->c_iflag;
1005 tp->t_oflag = t->c_oflag;
1007 * Make the EXTPROC bit read only.
1009 if (ISSET(tp->t_lflag, EXTPROC))
1010 SET(t->c_lflag, EXTPROC);
1012 CLR(t->c_lflag, EXTPROC);
1013 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1014 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1015 t->c_cc[VTIME] != tp->t_cc[VTIME])
1017 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1021 case TIOCSETD: { /* set line discipline */
1022 int t = *(int *)data;
1023 dev_t device = tp->t_dev;
1025 if ((u_int)t >= nlinesw)
1027 if (t != tp->t_line) {
1029 (*linesw[tp->t_line].l_close)(tp, flag);
1030 error = (*linesw[t].l_open)(device, tp);
1032 (void)(*linesw[tp->t_line].l_open)(device, tp);
1041 case TIOCSTART: /* start output, like ^Q */
1043 if (ISSET(tp->t_state, TS_TTSTOP) ||
1044 ISSET(tp->t_lflag, FLUSHO)) {
1045 CLR(tp->t_lflag, FLUSHO);
1046 CLR(tp->t_state, TS_TTSTOP);
1051 case TIOCSTI: /* simulate terminal input */
1052 if ((flag & FREAD) == 0 && suser(td))
1054 if (!isctty(p, tp) && suser(td))
1057 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1060 case TIOCSTOP: /* stop output, like ^S */
1062 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1063 SET(tp->t_state, TS_TTSTOP);
1064 (*tp->t_stop)(tp, 0);
1068 case TIOCSCTTY: /* become controlling tty */
1069 /* Session ctty vnode pointer set in vnode layer. */
1070 if (!SESS_LEADER(p) ||
1071 ((p->p_session->s_ttyvp || tp->t_session) &&
1072 (tp->t_session != p->p_session)))
1074 tp->t_session = p->p_session;
1075 tp->t_pgrp = p->p_pgrp;
1076 p->p_session->s_ttyp = tp;
1077 p->p_flag |= P_CONTROLT;
1079 case TIOCSPGRP: { /* set pgrp of tty */
1080 struct pgrp *pgrp = pgfind(*(int *)data);
1084 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1089 case TIOCSTAT: /* simulate control-T */
1094 case TIOCSWINSZ: /* set window size */
1095 if (bcmp((caddr_t)&tp->t_winsize, data,
1096 sizeof (struct winsize))) {
1097 tp->t_winsize = *(struct winsize *)data;
1098 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1101 case TIOCSDRAINWAIT:
1105 tp->t_timeout = *(int *)data * hz;
1106 wakeup(TSA_OCOMPLETE(tp));
1107 wakeup(TSA_OLOWAT(tp));
1109 case TIOCGDRAINWAIT:
1110 *(int *)data = tp->t_timeout / hz;
1113 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1114 return (ttcompat(tp, cmd, data, flag));
1123 ttypoll(dev, events, td)
1132 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1133 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1137 if (events & (POLLIN | POLLRDNORM)) {
1138 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1139 revents |= events & (POLLIN | POLLRDNORM);
1141 selrecord(td, &tp->t_rsel);
1143 if (events & (POLLOUT | POLLWRNORM)) {
1144 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1145 ISSET(tp->t_state, TS_CONNECTED))
1146 || ISSET(tp->t_state, TS_ZOMBIE))
1147 revents |= events & (POLLOUT | POLLWRNORM);
1149 selrecord(td, &tp->t_wsel);
1155 static struct filterops ttyread_filtops =
1156 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1157 static struct filterops ttywrite_filtops =
1158 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1161 ttykqfilter(dev, kn)
1165 struct tty *tp = dev->si_tty;
1166 struct klist *klist;
1168 switch (kn->kn_filter) {
1170 klist = &tp->t_rsel.si_note;
1171 kn->kn_fop = &ttyread_filtops;
1174 klist = &tp->t_wsel.si_note;
1175 kn->kn_fop = &ttywrite_filtops;
1181 kn->kn_hook = (caddr_t)dev;
1184 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1191 filt_ttyrdetach(struct knote *kn)
1193 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1196 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1201 filt_ttyread(struct knote *kn, long hint)
1203 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1205 kn->kn_data = ttnread(tp);
1206 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1207 kn->kn_flags |= EV_EOF;
1210 return (kn->kn_data > 0);
1214 filt_ttywdetach(struct knote *kn)
1216 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1219 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1224 filt_ttywrite(kn, hint)
1228 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1230 kn->kn_data = tp->t_outq.c_cc;
1231 if (ISSET(tp->t_state, TS_ZOMBIE))
1233 return (kn->kn_data <= tp->t_olowat &&
1234 ISSET(tp->t_state, TS_CONNECTED));
1238 * Must be called while in a critical section.
1246 if (ISSET(tp->t_lflag, PENDIN))
1248 nread = tp->t_canq.c_cc;
1249 if (!ISSET(tp->t_lflag, ICANON)) {
1250 nread += tp->t_rawq.c_cc;
1251 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1258 * Wait for output to drain.
1268 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1269 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1271 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1272 ISSET(tp->t_state, TS_CONNECTED)) {
1273 SET(tp->t_state, TS_SO_OCOMPLETE);
1274 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1278 if (error == EWOULDBLOCK)
1285 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1292 * Flush if successfully wait.
1300 if ((error = ttywait(tp)) == 0)
1301 ttyflush(tp, FREAD);
1306 * Flush tty read and/or write queues, notifying anyone waiting.
1318 FLUSHQ(&tp->t_outq);
1319 CLR(tp->t_state, TS_TTSTOP);
1321 (*tp->t_stop)(tp, rw);
1323 FLUSHQ(&tp->t_canq);
1324 FLUSHQ(&tp->t_rawq);
1325 CLR(tp->t_lflag, PENDIN);
1328 CLR(tp->t_state, TS_LOCAL);
1330 if (ISSET(tp->t_state, TS_TBLOCK)) {
1332 FLUSHQ(&tp->t_outq);
1336 * Don't let leave any state that might clobber the
1337 * next line discipline (although we should do more
1338 * to send the START char). Not clearing the state
1339 * may have caused the "putc to a clist with no
1340 * reserved cblocks" panic/printf.
1342 CLR(tp->t_state, TS_TBLOCK);
1344 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1345 if (ISSET(tp->t_iflag, IXOFF)) {
1347 * XXX wait a bit in the hope that the stop
1348 * character (if any) will go out. Waiting
1349 * isn't good since it allows races. This
1350 * will be fixed when the stop character is
1351 * put in a special queue. Don't bother with
1352 * the checks in ttywait() since the timeout
1355 SET(tp->t_state, TS_SO_OCOMPLETE);
1356 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1359 * Don't try sending the stop character again.
1361 CLR(tp->t_state, TS_TBLOCK);
1368 FLUSHQ(&tp->t_outq);
1375 * Copy in the default termios characters.
1382 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1393 termioschars(&tp->t_termios);
1397 * Handle input high water. Send stop character for the IXOFF case. Turn
1398 * on our input flow control bit and propagate the changes to the driver.
1399 * XXX the stop character should be put in a special high priority queue.
1406 SET(tp->t_state, TS_TBLOCK);
1407 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1408 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1409 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1414 * Handle input low water. Send start character for the IXOFF case. Turn
1415 * off our input flow control bit and propagate the changes to the driver.
1416 * XXX the start character should be put in a special high priority queue.
1423 CLR(tp->t_state, TS_TBLOCK);
1424 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1425 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1426 SET(tp->t_state, TS_TBLOCK); /* try again later */
1431 /* Not used by any current (i386) drivers. */
1433 * Restart after an inter-char delay.
1441 KASSERT(tp_arg != NULL, ("ttrstrt"));
1445 CLR(tp->t_state, TS_TIMEOUT);
1456 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1462 * "close" a line discipline
1470 if (flag & FNONBLOCK || ttywflush(tp))
1471 ttyflush(tp, FREAD | FWRITE);
1476 * Handle modem control transition on a tty.
1477 * Flag indicates new state of carrier.
1478 * Returns 0 if the line should be turned off, otherwise 1.
1486 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1488 * MDMBUF: do flow control according to carrier flag
1489 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1490 * works if IXON and IXANY are clear.
1493 CLR(tp->t_state, TS_CAR_OFLOW);
1494 CLR(tp->t_state, TS_TTSTOP);
1496 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1497 SET(tp->t_state, TS_CAR_OFLOW);
1498 SET(tp->t_state, TS_TTSTOP);
1499 (*tp->t_stop)(tp, 0);
1501 } else if (flag == 0) {
1505 CLR(tp->t_state, TS_CARR_ON);
1506 if (ISSET(tp->t_state, TS_ISOPEN) &&
1507 !ISSET(tp->t_cflag, CLOCAL)) {
1508 SET(tp->t_state, TS_ZOMBIE);
1509 CLR(tp->t_state, TS_CONNECTED);
1510 if (tp->t_session && tp->t_session->s_leader)
1511 psignal(tp->t_session->s_leader, SIGHUP);
1512 ttyflush(tp, FREAD | FWRITE);
1519 SET(tp->t_state, TS_CARR_ON);
1520 if (!ISSET(tp->t_state, TS_ZOMBIE))
1521 SET(tp->t_state, TS_CONNECTED);
1522 wakeup(TSA_CARR_ON(tp));
1530 * Reinput pending characters after state switch
1531 * call from a critical section.
1540 CLR(tp->t_lflag, PENDIN);
1541 SET(tp->t_state, TS_TYPEN);
1543 * XXX this assumes too much about clist internals. It may even
1544 * fail if the cblock slush pool is empty. We can't allocate more
1545 * cblocks here because we are called from an interrupt handler
1546 * and clist_alloc_cblocks() can wait.
1549 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1550 tp->t_rawq.c_cbmax = tq.c_cbmax;
1551 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1552 while ((c = getc(&tq)) >= 0)
1554 CLR(tp->t_state, TS_TYPEN);
1558 * Process a read call on a tty device.
1561 ttread(tp, uio, flag)
1569 cc_t *cc = tp->t_cc;
1571 int first, error = 0;
1572 int has_stime = 0, last_cc = 0;
1573 long slp = 0; /* XXX this should be renamed `timo'. */
1574 struct timeval stime;
1578 lflag = tp->t_lflag;
1580 * take pending input first
1582 if (ISSET(lflag, PENDIN)) {
1584 splz(); /* reduce latency */
1585 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1589 * Hang process if it's in the background.
1591 if ((pp = curproc) && isbackground(pp, tp)) {
1593 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1594 SIGISMEMBER(pp->p_sigmask, SIGTTIN) ||
1595 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1597 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1598 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1604 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1606 return (0); /* EOF */
1610 * If canonical, use the canonical queue,
1611 * else use the raw queue.
1613 * (should get rid of clists...)
1615 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1617 if (flag & IO_NDELAY) {
1620 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1625 return (EWOULDBLOCK);
1627 if (!ISSET(lflag, ICANON)) {
1630 struct timeval timecopy;
1633 * Check each of the four combinations.
1634 * (m > 0 && t == 0) is the normal read case.
1635 * It should be fairly efficient, so we check that and its
1636 * companion case (m == 0 && t == 0) first.
1637 * For the other two cases, we compute the target sleep time
1646 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1650 t *= 100000; /* time in us */
1651 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1652 ((t1).tv_usec - (t2).tv_usec))
1658 getmicrotime(&timecopy);
1660 /* first character, start timer */
1664 } else if (qp->c_cc > last_cc) {
1665 /* got a character, restart timer */
1669 /* nothing, check expiration */
1670 slp = t - diff(timecopy, stime);
1675 } else { /* m == 0 */
1678 getmicrotime(&timecopy);
1684 slp = t - diff(timecopy, stime);
1686 /* Timed out, but 0 is enough input. */
1694 * Rounding down may make us wake up just short
1695 * of the target, so we round up.
1696 * The formula is ceiling(slp * hz/1000000).
1697 * 32-bit arithmetic is enough for hz < 169.
1698 * XXX see tvtohz() for how to avoid overflow if hz
1699 * is large (divide by `tick' and/or arrange to
1700 * use tvtohz() if hz is large).
1702 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1705 if (qp->c_cc <= 0) {
1708 * There is no input, or not enough input and we can block.
1710 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1711 ISSET(tp->t_state, TS_CONNECTED) ?
1712 "ttyin" : "ttyhup", (int)slp);
1714 if (error == EWOULDBLOCK)
1719 * XXX what happens if another process eats some input
1720 * while we are asleep (not just here)? It would be
1721 * safest to detect changes and reset our state variables
1722 * (has_stime and last_cc).
1730 * Input present, check for input mapping and processing.
1733 if (ISSET(lflag, ICANON | ISIG))
1739 icc = imin(uio->uio_resid, IBUFSIZ);
1740 icc = q_to_b(qp, ibuf, icc);
1746 error = uiomove(ibuf, icc, uio);
1748 * XXX if there was an error then we should ungetc() the
1749 * unmoved chars and reduce icc here.
1753 if (uio->uio_resid == 0)
1767 * delayed suspend (^Y)
1769 if (CCEQ(cc[VDSUSP], c) &&
1770 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1771 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1773 error = ttysleep(tp, &lbolt, PCATCH,
1782 * Interpret EOF only in canonical mode.
1784 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1787 * Give user character.
1789 error = ureadc(c, uio);
1791 /* XXX should ungetc(c, qp). */
1793 if (uio->uio_resid == 0)
1796 * In canonical mode check for a "break character"
1797 * marking the end of a "line of input".
1799 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1806 * Look to unblock input now that (presumably)
1807 * the input queue has gone down.
1810 if (ISSET(tp->t_state, TS_TBLOCK) &&
1811 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1819 * Check the output queue on tp for space for a kernel message (from uprintf
1820 * or tprintf). Allow some space over the normal hiwater mark so we don't
1821 * lose messages due to normal flow control, but don't let the tty run amok.
1822 * Sleeps here are not interruptible, but we return prematurely if new signals
1826 ttycheckoutq(tp, wait)
1833 hiwat = tp->t_ohiwat;
1834 SIGEMPTYSET(oldmask);
1837 oldmask = curproc->p_siglist;
1838 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1839 while (tp->t_outq.c_cc > hiwat) {
1841 if (tp->t_outq.c_cc <= hiwat)
1843 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1847 SET(tp->t_state, TS_SO_OLOWAT);
1848 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1856 * Process a write call on a tty device.
1859 ttwrite(tp, uio, flag)
1867 int i, hiwat, cnt, error;
1870 hiwat = tp->t_ohiwat;
1871 cnt = uio->uio_resid;
1876 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1878 if (uio->uio_resid == cnt)
1882 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1883 if (flag & IO_NDELAY) {
1885 error = EWOULDBLOCK;
1888 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1897 * Hang the process if it's in the background.
1899 if ((pp = curproc) && isbackground(pp, tp) &&
1900 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1901 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1902 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) {
1903 if (pp->p_pgrp->pg_jobc == 0) {
1907 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1908 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1914 * Process the user's data in at most OBUFSIZ chunks. Perform any
1915 * output translation. Keep track of high water mark, sleep on
1916 * overflow awaiting device aid in acquiring new space.
1918 while (uio->uio_resid > 0 || cc > 0) {
1919 if (ISSET(tp->t_lflag, FLUSHO)) {
1923 if (tp->t_outq.c_cc > hiwat)
1926 * Grab a hunk of data from the user, unless we have some
1927 * leftover from last time.
1930 cc = imin(uio->uio_resid, OBUFSIZ);
1932 error = uiomove(cp, cc, uio);
1939 * If nothing fancy need be done, grab those characters we
1940 * can handle without any of ttyoutput's processing and
1941 * just transfer them to the output q. For those chars
1942 * which require special processing (as indicated by the
1943 * bits in char_type), call ttyoutput. After processing
1944 * a hunk of data, look for FLUSHO so ^O's will take effect
1948 if (!ISSET(tp->t_oflag, OPOST))
1951 ce = cc - scanc((u_int)cc, (u_char *)cp,
1952 char_type, CCLASSMASK);
1954 * If ce is zero, then we're processing
1955 * a special character through ttyoutput.
1959 if (ttyoutput(*cp, tp) >= 0) {
1960 /* No Clists, wait a bit. */
1962 if (flag & IO_NDELAY) {
1963 error = EWOULDBLOCK;
1966 error = ttysleep(tp, &lbolt,
1975 if (ISSET(tp->t_lflag, FLUSHO) ||
1976 tp->t_outq.c_cc > hiwat)
1982 * A bunch of normal characters have been found.
1983 * Transfer them en masse to the output queue and
1984 * continue processing at the top of the loop.
1985 * If there are any further characters in this
1986 * <= OBUFSIZ chunk, the first should be a character
1987 * requiring special handling by ttyoutput.
1990 i = b_to_q(cp, ce, &tp->t_outq);
1993 cp += ce, cc -= ce, tk_nout += ce;
1996 /* No Clists, wait a bit. */
1998 if (flag & IO_NDELAY) {
1999 error = EWOULDBLOCK;
2002 error = ttysleep(tp, &lbolt, PCATCH,
2008 if (ISSET(tp->t_lflag, FLUSHO) ||
2009 tp->t_outq.c_cc > hiwat)
2016 * If cc is nonzero, we leave the uio structure inconsistent, as the
2017 * offset and iov pointers have moved forward, but it doesn't matter
2018 * (the call will either return short or restart with a new uio).
2020 uio->uio_resid += cc;
2027 * This can only occur if FLUSHO is set in t_lflag,
2028 * or if ttstart/oproc is synchronous (or very fast).
2030 if (tp->t_outq.c_cc <= hiwat) {
2034 if (flag & IO_NDELAY) {
2036 uio->uio_resid += cc;
2037 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2039 SET(tp->t_state, TS_SO_OLOWAT);
2040 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2042 if (error == EWOULDBLOCK)
2050 * Rubout one character from the rawq of tp
2051 * as cleanly as possible.
2062 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2064 CLR(tp->t_lflag, FLUSHO);
2065 if (ISSET(tp->t_lflag, ECHOE)) {
2066 if (tp->t_rocount == 0) {
2068 * Screwed by ttwrite; retype
2073 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2076 CLR(c, ~TTY_CHARMASK);
2077 switch (CCLASS(c)) {
2086 if (ISSET(tp->t_lflag, ECHOCTL))
2090 if (tp->t_rocount < tp->t_rawq.c_cc) {
2095 savecol = tp->t_column;
2096 SET(tp->t_state, TS_CNTTB);
2097 SET(tp->t_lflag, FLUSHO);
2098 tp->t_column = tp->t_rocol;
2099 cp = tp->t_rawq.c_cf;
2101 tabc = *cp; /* XXX FIX NEXTC */
2102 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2104 CLR(tp->t_lflag, FLUSHO);
2105 CLR(tp->t_state, TS_CNTTB);
2108 /* savecol will now be length of the tab. */
2109 savecol -= tp->t_column;
2110 tp->t_column += savecol;
2112 savecol = 8; /* overflow screw */
2113 while (--savecol >= 0)
2114 (void)ttyoutput('\b', tp);
2117 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2118 (void)printf(PANICSTR, c, CCLASS(c));
2120 panic(PANICSTR, c, CCLASS(c));
2124 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2125 if (!ISSET(tp->t_state, TS_ERASE)) {
2126 SET(tp->t_state, TS_ERASE);
2127 (void)ttyoutput('\\', tp);
2131 ttyecho(tp->t_cc[VERASE], tp);
2133 * This code may be executed not only when an ERASE key
2134 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2135 * So, I didn't think it was worthwhile to pass the extra
2136 * information (which would need an extra parameter,
2137 * changing every call) needed to distinguish the ERASE2
2138 * case from the ERASE.
2145 * Back over cnt characters, erasing them.
2154 (void)ttyoutput('\b', tp);
2155 (void)ttyoutput(' ', tp);
2156 (void)ttyoutput('\b', tp);
2162 * Reprint the rawq line. Note, it is assumed that c_cc has already
2172 /* Echo the reprint character. */
2173 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2174 ttyecho(tp->t_cc[VREPRINT], tp);
2176 (void)ttyoutput('\n', tp);
2180 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2181 * BIT OF FIRST CHAR.
2184 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2185 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2187 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2188 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2190 CLR(tp->t_state, TS_ERASE);
2193 tp->t_rocount = tp->t_rawq.c_cc;
2198 * Echo a typed character to the terminal.
2206 if (!ISSET(tp->t_state, TS_CNTTB))
2207 CLR(tp->t_lflag, FLUSHO);
2208 if ((!ISSET(tp->t_lflag, ECHO) &&
2209 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2210 ISSET(tp->t_lflag, EXTPROC))
2212 if (ISSET(tp->t_lflag, ECHOCTL) &&
2213 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2214 ISSET(c, TTY_CHARMASK) == 0177)) {
2215 (void)ttyoutput('^', tp);
2216 CLR(c, ~TTY_CHARMASK);
2222 (void)ttyoutput(c, tp);
2226 * Wake up any readers on a tty.
2233 if (tp->t_rsel.si_pid != 0)
2234 selwakeup(&tp->t_rsel);
2235 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2236 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2237 wakeup(TSA_HUP_OR_INPUT(tp));
2238 KNOTE(&tp->t_rsel.si_note, 0);
2242 * Wake up any writers on a tty.
2249 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2250 selwakeup(&tp->t_wsel);
2251 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2252 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2253 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2254 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2255 CLR(tp->t_state, TS_SO_OCOMPLETE);
2256 wakeup(TSA_OCOMPLETE(tp));
2258 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2259 tp->t_outq.c_cc <= tp->t_olowat) {
2260 CLR(tp->t_state, TS_SO_OLOWAT);
2261 wakeup(TSA_OLOWAT(tp));
2263 KNOTE(&tp->t_wsel.si_note, 0);
2267 * Look up a code for a specified speed in a conversion table;
2268 * used by drivers to map software speed values to hardware parameters.
2271 ttspeedtab(speed, table)
2273 struct speedtab *table;
2276 for ( ; table->sp_speed != -1; table++)
2277 if (table->sp_speed == speed)
2278 return (table->sp_code);
2283 * Set input and output watermarks and buffer sizes. For input, the
2284 * high watermark is about one second's worth of input above empty, the
2285 * low watermark is slightly below high water, and the buffer size is a
2286 * driver-dependent amount above high water. For output, the watermarks
2287 * are near the ends of the buffer, with about 1 second's worth of input
2288 * between them. All this only applies to the standard line discipline.
2294 int cps, ttmaxhiwat, x;
2297 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2298 switch (tp->t_ispeedwat) {
2300 cps = tp->t_ispeed / 10;
2304 * This case is for old drivers that don't know about
2305 * t_ispeedwat. Arrange for them to get the old buffer
2306 * sizes and watermarks.
2308 cps = TTYHOG - 2 * 256;
2309 tp->t_ififosize = 2 * 256;
2312 cps = tp->t_ispeedwat / 10;
2316 tp->t_ilowat = 7 * cps / 8;
2317 x = cps + tp->t_ififosize;
2318 clist_alloc_cblocks(&tp->t_rawq, x, x);
2321 switch (tp->t_ospeedwat) {
2323 cps = tp->t_ospeed / 10;
2324 ttmaxhiwat = 2 * TTMAXHIWAT;
2327 cps = tp->t_ospeed / 10;
2328 ttmaxhiwat = TTMAXHIWAT;
2331 cps = tp->t_ospeedwat / 10;
2332 ttmaxhiwat = 8 * TTMAXHIWAT;
2335 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2336 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2338 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2339 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2340 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2342 clist_alloc_cblocks(&tp->t_outq, x, x);
2347 * Report on state of foreground process group.
2353 struct proc *p, *pick;
2354 struct timeval utime, stime;
2357 if (ttycheckoutq(tp,0) == 0)
2361 * We always print the load average, then figure out what else to
2362 * print based on the state of the current process group.
2364 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2365 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2367 if (tp->t_session == NULL) {
2368 ttyprintf(tp, "not a controlling terminal\n");
2369 } else if (tp->t_pgrp == NULL) {
2370 ttyprintf(tp, "no foreground process group\n");
2371 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2372 ttyprintf(tp, "empty foreground process group\n");
2375 * Pick an interesting process. Note that certain elements,
2376 * in particular the wmesg, require a critical section for
2377 * safe access (YYY and we are still not MP safe).
2379 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2380 * p_thread->td_comm.
2390 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2391 if (proc_compare(pick, p))
2396 * Figure out what wait/process-state message, and command
2399 if (pick->p_thread == NULL)
2401 else if (pick->p_stat == SRUN)
2403 else if (pick->p_wmesg) /* p_thread must not be NULL */
2404 str = pick->p_wmesg;
2408 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2409 (pick->p_thread ? pick->p_comm : "?"),
2413 * Calculate cpu usage, percent cpu, and cmsz. Note that
2414 * 'pick' becomes invalid the moment we exit the critical
2417 if (pick->p_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) {
2418 calcru(pick, &utime, &stime, NULL);
2424 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2426 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE))
2429 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2436 ttyprintf(tp, " %s ", buf);
2438 ttyprintf(tp, "%ld.%02ldu ",
2439 utime.tv_sec, utime.tv_usec / 10000);
2440 ttyprintf(tp, "%ld.%02lds ",
2441 stime.tv_sec, stime.tv_usec / 10000);
2443 ttyprintf(tp, "?.??u ?.??s ");
2445 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2447 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2451 * Returns 1 if p2 is "better" than p1
2453 * The algorithm for picking the "interesting" process is thus:
2455 * 1) Only foreground processes are eligible - implied.
2456 * 2) Runnable processes are favored over anything else. The runner
2457 * with the highest cpu utilization is picked (p_cpticks). Ties are
2458 * broken by picking the highest pid.
2459 * 3) The sleeper with the shortest sleep time is next. With ties,
2460 * we pick out just "short-term" sleepers (P_SINTR == 0).
2461 * 4) Further ties are broken by picking the highest pid.
2463 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2464 #define TESTAB(a, b) ((a)<<1 | (b))
2470 proc_compare(p1, p2)
2471 struct proc *p1, *p2;
2477 * see if at least one of them is runnable
2479 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2486 * tie - favor one with highest recent cpu utilization
2488 if (p2->p_cpticks > p1->p_cpticks)
2490 if (p1->p_cpticks > p2->p_cpticks)
2492 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2497 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) {
2503 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2506 * pick the one with the smallest sleep time
2508 if (p2->p_slptime > p1->p_slptime)
2510 if (p1->p_slptime > p2->p_slptime)
2513 * favor one sleeping in a non-interruptible sleep
2515 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2517 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2519 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2523 * Output char to tty; console putchar style.
2531 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2536 (void)ttyoutput('\r', tp);
2537 (void)ttyoutput(c, tp);
2544 * Sleep on chan, returning ERESTART if tty changed while we napped and
2545 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2546 * the tty is revoked, restarting a pending call will redo validation done
2547 * at the start of the call.
2550 ttysleep(tp, chan, slpflags, wmesg, timo)
2560 error = tsleep(chan, slpflags, wmesg, timo);
2563 return (tp->t_gen == gen ? 0 : ERESTART);
2567 * Allocate a tty struct. Clists in the struct will be allocated by
2577 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2584 * Free a tty struct. Clists in the struct should have been freed by
2587 * XXX not yet usable: since we support a half-closed state and do not
2588 * ref count the tty reference from the session, it is possible for a
2589 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2603 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2607 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2611 SLIST_FOREACH(tp, &tty_list, t_list) {
2614 t.t_dev = (dev_t)dev2udev(t.t_dev);
2615 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2622 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2623 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2635 ttyread(dev, uio, flag)
2645 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2649 ttywrite(dev, uio, flag)
2659 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));