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>
89 #include <sys/kernel.h>
90 #include <sys/vnode.h>
91 #include <sys/signalvar.h>
92 #include <sys/signal2.h>
93 #include <sys/resourcevar.h>
94 #include <sys/malloc.h>
95 #include <sys/filedesc.h>
96 #include <sys/sysctl.h>
97 #include <sys/thread2.h>
100 #include <sys/lock.h>
102 #include <vm/vm_map.h>
104 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
106 static int proc_compare (struct proc *p1, struct proc *p2);
107 static int ttnread (struct tty *tp);
108 static void ttyecho (int c, struct tty *tp);
109 static int ttyoutput (int c, struct tty *tp);
110 static void ttypend (struct tty *tp);
111 static void ttyretype (struct tty *tp);
112 static void ttyrub (int c, struct tty *tp);
113 static void ttyrubo (struct tty *tp, int cnt);
114 static void ttyunblock (struct tty *tp);
115 static int ttywflush (struct tty *tp);
116 static int filt_ttyread (struct knote *kn, long hint);
117 static void filt_ttyrdetach (struct knote *kn);
118 static int filt_ttywrite (struct knote *kn, long hint);
119 static void filt_ttywdetach (struct knote *kn);
122 * Table with character classes and parity. The 8th bit indicates parity,
123 * the 7th bit indicates the character is an alphameric or underscore (for
124 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
125 * are 0 then the character needs no special processing on output; classes
126 * other than 0 might be translated or (not currently) require delays.
128 #define E 0x00 /* Even parity. */
129 #define O 0x80 /* Odd parity. */
130 #define PARITY(c) (char_type[c] & O)
132 #define ALPHA 0x40 /* Alpha or underscore. */
133 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
135 #define CCLASSMASK 0x3f
136 #define CCLASS(c) (char_type[c] & CCLASSMASK)
141 #define NA ORDINARY | ALPHA
147 static u_char const char_type[] = {
148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
149 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
150 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
151 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
152 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
153 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
155 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
156 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
159 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
160 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
163 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
165 * Meta chars; should be settable per character set;
166 * for now, treat them all as normal characters.
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
183 NA, NA, NA, NA, NA, NA, NA, NA,
194 /* Macros to clear/set/test flags. */
195 #define SET(t, f) (t) |= (f)
196 #define CLR(t, f) (t) &= ~(f)
197 #define ISSET(t, f) ((t) & (f))
199 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
200 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
203 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
204 "LU", "TTY input statistic");
206 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
207 "LU", "TTY output statistic");
211 * list of struct tty where pstat(8) can pick it up with sysctl
213 static SLIST_HEAD(, tty) tty_list;
216 * Initial open of tty, or (re)entry to standard tty line discipline.
219 ttyopen(cdev_t device, struct tty *tp)
223 if (!ISSET(tp->t_state, TS_ISOPEN)) {
224 SET(tp->t_state, TS_ISOPEN);
225 if (ISSET(tp->t_cflag, CLOCAL)) {
226 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
245 ttyclose(struct tty *tp)
247 funsetown(tp->t_sigio);
252 ttyflush(tp, FREAD | FWRITE);
253 clist_free_cblocks(&tp->t_canq);
254 clist_free_cblocks(&tp->t_outq);
255 clist_free_cblocks(&tp->t_rawq);
258 tp->t_line = TTYDISC;
266 * Disassociate the tty from its session. Traditionally this has only been
267 * a half-close, meaning that the session was still allowed to point at the
268 * tty (resulting in the tty in the ps command showing something like 'p0-'),
269 * even though the tty is no longer pointing at the session.
271 * The half close seems to be useful only for 'ps' output but there is as
272 * yet no reason to remove the feature. The full-close code is currently
273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
276 ttyclearsession(struct tty *tp)
281 if ((sp = tp->t_session) != NULL) {
282 tp->t_session = NULL;
283 #ifdef TTY_DO_FULL_CLOSE
284 /* FULL CLOSE (not yet) */
285 if (sp->s_ttyp == tp) {
288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
289 "%p/%p\n", sp->s_ttyp, tp);
296 * Release the tty vnode association for a session. This is the
297 * 'other half' of the close. Because multiple opens of /dev/tty
298 * only generate a single open to the actual tty, the file modes
299 * are locked to FREAD|FWRITE.
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
305 ttyclosesession(struct session *sp, int dorevoke)
311 * There may not be a controlling terminal or it may have been closed
314 if ((vp = sp->s_ttyvp) == NULL)
318 * We need a lock if we have to close or revoke.
320 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
322 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
328 * Retry if the vnode was ripped out from under us
330 if (vp != sp->s_ttyvp) {
337 * Close and revoke as needed
340 if (vp->v_flag & VCTTYISOPEN) {
341 vclrflags(vp, VCTTYISOPEN);
342 VOP_CLOSE(vp, FREAD|FWRITE);
346 vrevoke(vp, proc0.p_ucred);
354 #define FLUSHQ(q) { \
356 ndflush(q, (q)->c_cc); \
359 /* Is 'c' a line delimiter ("break" character)? */
360 #define TTBREAKC(c, lflag) \
361 ((c) == '\n' || (((c) == cc[VEOF] || \
362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
363 (c) != _POSIX_VDISABLE))
366 * Process input of a single character received on a tty.
369 ttyinput(int c, struct tty *tp)
371 tcflag_t iflag, lflag;
376 * If input is pending take it first.
379 if (ISSET(lflag, PENDIN))
384 if (ISSET(lflag, ICANON))
391 * Block further input iff:
392 * current input > threshold AND input is available to user program
393 * AND input flow control is enabled and not yet invoked.
394 * The 3 is slop for PARMRK.
397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
398 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
399 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
400 !ISSET(tp->t_state, TS_TBLOCK))
403 /* Handle exceptional conditions (break, parity, framing). */
405 err = (ISSET(c, TTY_ERRORMASK));
407 CLR(c, TTY_ERRORMASK);
408 if (ISSET(err, TTY_BI)) {
409 if (ISSET(iflag, IGNBRK))
411 if (ISSET(iflag, BRKINT)) {
412 ttyflush(tp, FREAD | FWRITE);
413 pgsignal(tp->t_pgrp, SIGINT, 1);
416 if (ISSET(iflag, PARMRK))
418 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
419 || ISSET(err, TTY_FE)) {
420 if (ISSET(iflag, IGNPAR))
422 else if (ISSET(iflag, PARMRK)) {
424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
427 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
428 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
429 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
436 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
438 if (!ISSET(lflag, EXTPROC)) {
440 * Check for literal nexting very first
442 if (ISSET(tp->t_state, TS_LNCH)) {
444 CLR(tp->t_state, TS_LNCH);
447 * Scan for special characters. This code
448 * is really just a big case statement with
449 * non-constant cases. The bottom of the
450 * case statement is labeled ``endcase'', so goto
451 * it after a case match, or similar.
455 * Control chars which aren't controlled
456 * by ICANON, ISIG, or IXON.
458 if (ISSET(lflag, IEXTEN)) {
459 if (CCEQ(cc[VLNEXT], c)) {
460 if (ISSET(lflag, ECHO)) {
461 if (ISSET(lflag, ECHOE)) {
462 (void)ttyoutput('^', tp);
463 (void)ttyoutput('\b', tp);
467 SET(tp->t_state, TS_LNCH);
470 if (CCEQ(cc[VDISCARD], c)) {
471 if (ISSET(lflag, FLUSHO))
472 CLR(tp->t_lflag, FLUSHO);
474 ttyflush(tp, FWRITE);
476 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
478 SET(tp->t_lflag, FLUSHO);
486 if (ISSET(lflag, ISIG)) {
487 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
488 if (!ISSET(lflag, NOFLSH))
489 ttyflush(tp, FREAD | FWRITE);
492 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
495 if (CCEQ(cc[VSUSP], c)) {
496 if (!ISSET(lflag, NOFLSH))
499 pgsignal(tp->t_pgrp, SIGTSTP, 1);
504 * Handle start/stop characters.
506 if (ISSET(iflag, IXON)) {
507 if (CCEQ(cc[VSTOP], c)) {
508 if (!ISSET(tp->t_state, TS_TTSTOP)) {
509 SET(tp->t_state, TS_TTSTOP);
510 (*tp->t_stop)(tp, 0);
513 if (!CCEQ(cc[VSTART], c))
516 * if VSTART == VSTOP then toggle
520 if (CCEQ(cc[VSTART], c))
524 * IGNCR, ICRNL, & INLCR
527 if (ISSET(iflag, IGNCR))
529 else if (ISSET(iflag, ICRNL))
531 } else if (c == '\n' && ISSET(iflag, INLCR))
534 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
536 * From here on down canonical mode character
537 * processing takes place.
540 * erase or erase2 (^H / ^?)
542 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
544 ttyrub(clist_unputc(&tp->t_rawq), tp);
550 if (CCEQ(cc[VKILL], c)) {
551 if (ISSET(lflag, ECHOKE) &&
552 tp->t_rawq.c_cc == tp->t_rocount &&
553 !ISSET(lflag, ECHOPRT))
554 while (tp->t_rawq.c_cc)
555 ttyrub(clist_unputc(&tp->t_rawq), tp);
558 if (ISSET(lflag, ECHOK) ||
559 ISSET(lflag, ECHOKE))
564 CLR(tp->t_state, TS_LOCAL);
570 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
581 * erase last char of word and remember the
582 * next chars type (for ALTWERASE)
585 c = clist_unputc(&tp->t_rawq);
588 if (c == ' ' || c == '\t') {
589 clist_putc(c, &tp->t_rawq);
598 c = clist_unputc(&tp->t_rawq);
601 } while (c != ' ' && c != '\t' &&
602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
603 clist_putc(c, &tp->t_rawq);
609 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
614 * ^T - kernel info and generate SIGINFO
616 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
617 if (ISSET(lflag, ISIG))
618 pgsignal(tp->t_pgrp, SIGINFO, 1);
619 if (!ISSET(lflag, NOKERNINFO))
623 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
624 if (ISSET(lflag, ISIG))
625 pgsignal(tp->t_pgrp, SIGCKPT, 1);
630 * Check for input buffer overflow
632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
634 if (ISSET(iflag, IMAXBEL)) {
635 if (tp->t_outq.c_cc < tp->t_ohiwat)
636 (void)ttyoutput(CTRL('g'), tp);
641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
649 if (clist_putc(c, &tp->t_rawq) >= 0) {
650 if (!ISSET(lflag, ICANON)) {
655 if (TTBREAKC(c, lflag)) {
657 catq(&tp->t_rawq, &tp->t_canq);
659 } else if (tp->t_rocount++ == 0)
660 tp->t_rocol = tp->t_column;
661 if (ISSET(tp->t_state, TS_ERASE)) {
663 * end of prterase \.../
665 CLR(tp->t_state, TS_ERASE);
666 (void)ttyoutput('/', tp);
670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
672 * Place the cursor over the '^' of the ^D.
674 i = imin(2, tp->t_column - i);
676 (void)ttyoutput('\b', tp);
683 * IXANY means allow any character to restart output.
685 if (ISSET(tp->t_state, TS_TTSTOP) &&
686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
689 CLR(tp->t_lflag, FLUSHO);
690 CLR(tp->t_state, TS_TTSTOP);
692 return (ttstart(tp));
696 * Output a single character on a tty, doing output processing
697 * as needed (expanding tabs, newline processing, etc.).
698 * Returns < 0 if succeeds, otherwise returns char to resend.
702 ttyoutput(int c, struct tty *tp)
708 if (!ISSET(oflag, OPOST)) {
709 if (ISSET(tp->t_lflag, FLUSHO))
711 if (clist_putc(c, &tp->t_outq))
718 * Do tab expansion if OXTABS is set. Special case if we external
719 * processing, we don't do the tab expansion because we'll probably
720 * get it wrong. If tab expansion needs to be done, let it happen
723 CLR(c, ~TTY_CHARMASK);
725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
726 c = 8 - (tp->t_column & 7);
727 if (!ISSET(tp->t_lflag, FLUSHO)) {
728 crit_enter(); /* Don't interrupt tabs. */
729 c -= b_to_q(" ", c, &tp->t_outq);
735 return (c ? -1 : '\t');
737 if (c == CEOT && ISSET(oflag, ONOEOT))
741 * Newline translation: if ONLCR is set,
742 * translate newline into "\r\n".
744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
750 /* If OCRNL is set, translate "\r" into "\n". */
751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
753 /* If ONOCR is set, don't transmit CRs when on column 0. */
754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
771 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
781 col = (col + 8) & ~7;
789 * Ioctls for all tty devices. Called after line-discipline specific ioctl
790 * has been called to do discipline-specific functions and/or reject any
791 * of these ioctl commands.
795 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
797 struct thread *td = curthread;
798 struct lwp *lp = td->td_lwp;
799 struct proc *p = td->td_proc;
804 /* If the ioctl involves modification, hang if in the background. */
828 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
838 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
839 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
841 if (p->p_pgrp->pg_jobc == 0)
843 pgsignal(p->p_pgrp, SIGTTOU, 1);
844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
852 switch (cmd) { /* Process the ioctl. */
853 case FIOASYNC: /* set/clear async i/o */
856 SET(tp->t_state, TS_ASYNC);
858 CLR(tp->t_state, TS_ASYNC);
861 case FIONREAD: /* get # bytes to read */
863 *(int *)data = ttnread(tp);
869 * Policy -- Don't allow FIOSETOWN on someone else's
872 if (tp->t_session != NULL && !isctty(p, tp))
875 error = fsetown(*(int *)data, &tp->t_sigio);
880 if (tp->t_session != NULL && !isctty(p, tp))
882 *(int *)data = fgetown(tp->t_sigio);
885 case TIOCEXCL: /* set exclusive use of tty */
887 SET(tp->t_state, TS_XCLUDE);
890 case TIOCFLUSH: { /* flush buffers */
891 int flags = *(int *)data;
894 flags = FREAD | FWRITE;
896 flags &= FREAD | FWRITE;
900 case TIOCCONS: /* become virtual console */
902 if (constty && constty != tp &&
903 ISSET(constty->t_state, TS_CONNECTED))
906 if ((error = priv_check(td, PRIV_ROOT)) != 0)
910 } else if (tp == constty)
913 case TIOCDRAIN: /* wait till output drained */
918 case TIOCGETA: { /* get termios struct */
919 struct termios *t = (struct termios *)data;
921 bcopy(&tp->t_termios, t, sizeof(struct termios));
924 case TIOCGETD: /* get line discipline */
925 *(int *)data = tp->t_line;
927 case TIOCGWINSZ: /* get window size */
928 *(struct winsize *)data = tp->t_winsize;
930 case TIOCGPGRP: /* get pgrp of tty */
933 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
935 case TIOCGSID: /* get sid of tty */
938 *(int *)data = tp->t_session->s_sid;
941 case TIOCHPCL: /* hang up on last close */
943 SET(tp->t_cflag, HUPCL);
947 case TIOCNXCL: /* reset exclusive use of tty */
949 CLR(tp->t_state, TS_XCLUDE);
952 case TIOCOUTQ: /* output queue size */
953 *(int *)data = tp->t_outq.c_cc;
955 case TIOCSETA: /* set termios struct */
956 case TIOCSETAW: /* drain output, set */
957 case TIOCSETAF: { /* drn out, fls in, set */
958 struct termios *t = (struct termios *)data;
960 if (t->c_ispeed == 0)
961 t->c_ispeed = t->c_ospeed;
962 if (t->c_ispeed == 0)
963 t->c_ispeed = tp->t_ospeed;
964 if (t->c_ispeed == 0)
967 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
973 if (cmd == TIOCSETAF)
976 if (!ISSET(t->c_cflag, CIGNORE)) {
978 * Set device hardware.
980 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
984 if (ISSET(t->c_cflag, CLOCAL) &&
985 !ISSET(tp->t_cflag, CLOCAL)) {
987 * XXX disconnections would be too hard to
988 * get rid of without this kludge. The only
989 * way to get rid of controlling terminals
990 * is to exit from the session leader.
992 CLR(tp->t_state, TS_ZOMBIE);
994 wakeup(TSA_CARR_ON(tp));
998 if ((ISSET(tp->t_state, TS_CARR_ON) ||
999 ISSET(t->c_cflag, CLOCAL)) &&
1000 !ISSET(tp->t_state, TS_ZOMBIE))
1001 SET(tp->t_state, TS_CONNECTED);
1003 CLR(tp->t_state, TS_CONNECTED);
1004 tp->t_cflag = t->c_cflag;
1005 tp->t_ispeed = t->c_ispeed;
1006 if (t->c_ospeed != 0)
1007 tp->t_ospeed = t->c_ospeed;
1010 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1012 if (ISSET(t->c_lflag, ICANON))
1013 SET(tp->t_lflag, PENDIN);
1016 * XXX we really shouldn't allow toggling
1017 * ICANON while we're in a non-termios line
1018 * discipline. Now we have to worry about
1019 * panicing for a null queue.
1021 if (tp->t_canq.c_cbreserved > 0 &&
1022 tp->t_rawq.c_cbreserved > 0) {
1023 catq(&tp->t_rawq, &tp->t_canq);
1025 * XXX the queue limits may be
1026 * different, so the old queue
1027 * swapping method no longer works.
1029 catq(&tp->t_canq, &tp->t_rawq);
1031 CLR(tp->t_lflag, PENDIN);
1035 tp->t_iflag = t->c_iflag;
1036 tp->t_oflag = t->c_oflag;
1038 * Make the EXTPROC bit read only.
1040 if (ISSET(tp->t_lflag, EXTPROC))
1041 SET(t->c_lflag, EXTPROC);
1043 CLR(t->c_lflag, EXTPROC);
1044 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1045 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1046 t->c_cc[VTIME] != tp->t_cc[VTIME])
1048 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1052 case TIOCSETD: { /* set line discipline */
1053 int t = *(int *)data;
1054 cdev_t device = tp->t_dev;
1056 if ((u_int)t >= nlinesw)
1058 if (t != tp->t_line) {
1060 (*linesw[tp->t_line].l_close)(tp, flag);
1061 error = (*linesw[t].l_open)(device, tp);
1063 (void)(*linesw[tp->t_line].l_open)(device, tp);
1072 case TIOCSTART: /* start output, like ^Q */
1074 if (ISSET(tp->t_state, TS_TTSTOP) ||
1075 ISSET(tp->t_lflag, FLUSHO)) {
1076 CLR(tp->t_lflag, FLUSHO);
1077 CLR(tp->t_state, TS_TTSTOP);
1082 case TIOCSTI: /* simulate terminal input */
1083 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
1085 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
1088 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1091 case TIOCSTOP: /* stop output, like ^S */
1093 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1094 SET(tp->t_state, TS_TTSTOP);
1095 (*tp->t_stop)(tp, 0);
1099 case TIOCSCTTY: /* become controlling tty */
1100 /* Session ctty vnode pointer set in vnode layer. */
1101 if (!SESS_LEADER(p) ||
1102 ((p->p_session->s_ttyvp || tp->t_session) &&
1103 (tp->t_session != p->p_session)))
1105 tp->t_session = p->p_session;
1106 tp->t_pgrp = p->p_pgrp;
1107 p->p_session->s_ttyp = tp;
1108 p->p_flag |= P_CONTROLT;
1110 case TIOCSPGRP: { /* set pgrp of tty */
1111 pid_t pgid = *(int *)data;
1115 else if (pgid < 1 || pgid > PID_MAX)
1118 struct pgrp *pgrp = pgfind(pgid);
1119 if (pgrp == NULL || pgrp->pg_session != p->p_session)
1126 case TIOCSTAT: /* simulate control-T */
1131 case TIOCSWINSZ: /* set window size */
1132 if (bcmp((caddr_t)&tp->t_winsize, data,
1133 sizeof (struct winsize))) {
1134 tp->t_winsize = *(struct winsize *)data;
1135 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1138 case TIOCSDRAINWAIT:
1139 error = priv_check(td, PRIV_ROOT);
1142 tp->t_timeout = *(int *)data * hz;
1143 wakeup(TSA_OCOMPLETE(tp));
1144 wakeup(TSA_OLOWAT(tp));
1146 case TIOCGDRAINWAIT:
1147 *(int *)data = tp->t_timeout / hz;
1150 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1151 return (ttcompat(tp, cmd, data, flag));
1159 static struct filterops ttyread_filtops =
1160 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1161 static struct filterops ttywrite_filtops =
1162 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1165 ttykqfilter(struct dev_kqfilter_args *ap)
1167 cdev_t dev = ap->a_head.a_dev;
1168 struct knote *kn = ap->a_kn;
1169 struct tty *tp = dev->si_tty;
1170 struct klist *klist;
1173 switch (kn->kn_filter) {
1175 klist = &tp->t_rsel.si_note;
1176 kn->kn_fop = &ttyread_filtops;
1179 klist = &tp->t_wsel.si_note;
1180 kn->kn_fop = &ttywrite_filtops;
1183 ap->a_result = EOPNOTSUPP;
1187 kn->kn_hook = (caddr_t)dev;
1190 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1197 filt_ttyrdetach(struct knote *kn)
1199 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1202 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1207 filt_ttyread(struct knote *kn, long hint)
1209 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1211 kn->kn_data = ttnread(tp);
1212 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1213 kn->kn_flags |= EV_EOF;
1216 return (kn->kn_data > 0);
1220 filt_ttywdetach(struct knote *kn)
1222 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1225 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1230 filt_ttywrite(struct knote *kn, long hint)
1232 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1234 kn->kn_data = tp->t_outq.c_cc;
1235 if (ISSET(tp->t_state, TS_ZOMBIE))
1237 return (kn->kn_data <= tp->t_olowat &&
1238 ISSET(tp->t_state, TS_CONNECTED));
1242 * Must be called while in a critical section.
1245 ttnread(struct tty *tp)
1249 if (ISSET(tp->t_lflag, PENDIN))
1251 nread = tp->t_canq.c_cc;
1252 if (!ISSET(tp->t_lflag, ICANON)) {
1253 nread += tp->t_rawq.c_cc;
1254 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1261 * Wait for output to drain.
1264 ttywait(struct tty *tp)
1270 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1271 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1273 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1274 ISSET(tp->t_state, TS_CONNECTED)) {
1275 SET(tp->t_state, TS_SO_OCOMPLETE);
1276 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1280 if (error == EWOULDBLOCK)
1287 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1294 * Flush if successfully wait.
1297 ttywflush(struct tty *tp)
1301 if ((error = ttywait(tp)) == 0)
1302 ttyflush(tp, FREAD);
1307 * Flush tty read and/or write queues, notifying anyone waiting.
1310 ttyflush(struct tty *tp, int rw)
1317 FLUSHQ(&tp->t_outq);
1318 CLR(tp->t_state, TS_TTSTOP);
1320 (*tp->t_stop)(tp, rw);
1322 FLUSHQ(&tp->t_canq);
1323 FLUSHQ(&tp->t_rawq);
1324 CLR(tp->t_lflag, PENDIN);
1327 CLR(tp->t_state, TS_LOCAL);
1329 if (ISSET(tp->t_state, TS_TBLOCK)) {
1331 FLUSHQ(&tp->t_outq);
1335 * Don't let leave any state that might clobber the
1336 * next line discipline (although we should do more
1337 * to send the START char). Not clearing the state
1338 * may have caused the "putc to a clist with no
1339 * reserved cblocks" panic/kprintf.
1341 CLR(tp->t_state, TS_TBLOCK);
1343 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1344 if (ISSET(tp->t_iflag, IXOFF)) {
1346 * XXX wait a bit in the hope that the stop
1347 * character (if any) will go out. Waiting
1348 * isn't good since it allows races. This
1349 * will be fixed when the stop character is
1350 * put in a special queue. Don't bother with
1351 * the checks in ttywait() since the timeout
1354 SET(tp->t_state, TS_SO_OCOMPLETE);
1355 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1358 * Don't try sending the stop character again.
1360 CLR(tp->t_state, TS_TBLOCK);
1367 FLUSHQ(&tp->t_outq);
1374 * Copy in the default termios characters.
1377 termioschars(struct termios *t)
1380 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1387 ttychars(struct tty *tp)
1390 termioschars(&tp->t_termios);
1394 * Handle input high water. Send stop character for the IXOFF case. Turn
1395 * on our input flow control bit and propagate the changes to the driver.
1396 * XXX the stop character should be put in a special high priority queue.
1399 ttyblock(struct tty *tp)
1402 SET(tp->t_state, TS_TBLOCK);
1403 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1404 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1405 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1410 * Handle input low water. Send start character for the IXOFF case. Turn
1411 * off our input flow control bit and propagate the changes to the driver.
1412 * XXX the start character should be put in a special high priority queue.
1415 ttyunblock(struct tty *tp)
1418 CLR(tp->t_state, TS_TBLOCK);
1419 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1420 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1421 SET(tp->t_state, TS_TBLOCK); /* try again later */
1426 /* Not used by any current (i386) drivers. */
1428 * Restart after an inter-char delay.
1431 ttrstrt(void *tp_arg)
1435 KASSERT(tp_arg != NULL, ("ttrstrt"));
1439 CLR(tp->t_state, TS_TIMEOUT);
1446 ttstart(struct tty *tp)
1449 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1455 * "close" a line discipline
1458 ttylclose(struct tty *tp, int flag)
1461 if (flag & FNONBLOCK || ttywflush(tp))
1462 ttyflush(tp, FREAD | FWRITE);
1467 * Handle modem control transition on a tty.
1468 * Flag indicates new state of carrier.
1469 * Returns 0 if the line should be turned off, otherwise 1.
1472 ttymodem(struct tty *tp, int flag)
1475 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1477 * MDMBUF: do flow control according to carrier flag
1478 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1479 * works if IXON and IXANY are clear.
1482 CLR(tp->t_state, TS_CAR_OFLOW);
1483 CLR(tp->t_state, TS_TTSTOP);
1485 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1486 SET(tp->t_state, TS_CAR_OFLOW);
1487 SET(tp->t_state, TS_TTSTOP);
1488 (*tp->t_stop)(tp, 0);
1490 } else if (flag == 0) {
1494 CLR(tp->t_state, TS_CARR_ON);
1495 if (ISSET(tp->t_state, TS_ISOPEN) &&
1496 !ISSET(tp->t_cflag, CLOCAL)) {
1497 SET(tp->t_state, TS_ZOMBIE);
1498 CLR(tp->t_state, TS_CONNECTED);
1499 if (tp->t_session && tp->t_session->s_leader)
1500 ksignal(tp->t_session->s_leader, SIGHUP);
1501 ttyflush(tp, FREAD | FWRITE);
1508 SET(tp->t_state, TS_CARR_ON);
1509 if (!ISSET(tp->t_state, TS_ZOMBIE))
1510 SET(tp->t_state, TS_CONNECTED);
1511 wakeup(TSA_CARR_ON(tp));
1519 * Reinput pending characters after state switch
1520 * call from a critical section.
1523 ttypend(struct tty *tp)
1528 CLR(tp->t_lflag, PENDIN);
1529 SET(tp->t_state, TS_TYPEN);
1531 * XXX this assumes too much about clist internals. It may even
1532 * fail if the cblock slush pool is empty. We can't allocate more
1533 * cblocks here because we are called from an interrupt handler
1534 * and clist_alloc_cblocks() can wait.
1537 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1538 tp->t_rawq.c_cbmax = tq.c_cbmax;
1539 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1540 while ((c = clist_getc(&tq)) >= 0)
1542 CLR(tp->t_state, TS_TYPEN);
1546 * Process a read call on a tty device.
1549 ttread(struct tty *tp, struct uio *uio, int flag)
1554 cc_t *cc = tp->t_cc;
1557 int first, error = 0;
1558 int has_stime = 0, last_cc = 0;
1559 long slp = 0; /* XXX this should be renamed `timo'. */
1560 struct timeval stime;
1562 lp = curthread->td_lwp;
1563 stime.tv_sec = 0; /* fix compiler warnings */
1568 lflag = tp->t_lflag;
1570 * take pending input first
1572 if (ISSET(lflag, PENDIN)) {
1574 splz(); /* reduce latency */
1575 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1579 * Hang process if it's in the background.
1581 if ((pp = curproc) && isbackground(pp, tp)) {
1583 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1584 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1585 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1587 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1588 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1594 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1596 return (0); /* EOF */
1600 * If canonical, use the canonical queue,
1601 * else use the raw queue.
1603 * (should get rid of clists...)
1605 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1607 if (flag & IO_NDELAY) {
1610 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1615 return (EWOULDBLOCK);
1617 if (!ISSET(lflag, ICANON)) {
1620 struct timeval timecopy;
1623 * Check each of the four combinations.
1624 * (m > 0 && t == 0) is the normal read case.
1625 * It should be fairly efficient, so we check that and its
1626 * companion case (m == 0 && t == 0) first.
1627 * For the other two cases, we compute the target sleep time
1636 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1640 t *= 100000; /* time in us */
1641 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1642 ((t1).tv_usec - (t2).tv_usec))
1648 getmicrotime(&timecopy);
1649 if (has_stime == 0) {
1650 /* first character, start timer */
1654 } else if (qp->c_cc > last_cc) {
1655 /* got a character, restart timer */
1659 /* nothing, check expiration */
1660 slp = t - diff(timecopy, stime);
1665 } else { /* m == 0 */
1668 getmicrotime(&timecopy);
1669 if (has_stime == 0) {
1674 slp = t - diff(timecopy, stime);
1676 /* Timed out, but 0 is enough input. */
1684 * Rounding down may make us wake up just short
1685 * of the target, so we round up.
1686 * The formula is ceiling(slp * hz/1000000).
1687 * 32-bit arithmetic is enough for hz < 169.
1688 * XXX see tvtohz() for how to avoid overflow if hz
1689 * is large (divide by `tick' and/or arrange to
1690 * use tvtohz() if hz is large).
1692 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1695 if (qp->c_cc <= 0) {
1698 * There is no input, or not enough input and we can block.
1700 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1701 ISSET(tp->t_state, TS_CONNECTED) ?
1702 "ttyin" : "ttyhup", (int)slp);
1704 if (error == EWOULDBLOCK)
1709 * XXX what happens if another process eats some input
1710 * while we are asleep (not just here)? It would be
1711 * safest to detect changes and reset our state variables
1712 * (has_stime and last_cc).
1720 * Input present, check for input mapping and processing.
1723 if (ISSET(lflag, ICANON | ISIG))
1729 icc = (int)szmin(uio->uio_resid, IBUFSIZ);
1730 icc = q_to_b(qp, ibuf, icc);
1736 error = uiomove(ibuf, (size_t)icc, uio);
1738 * XXX if there was an error then we should ungetc() the
1739 * unmoved chars and reduce icc here.
1743 if (uio->uio_resid == 0)
1757 * delayed suspend (^Y)
1759 if (CCEQ(cc[VDSUSP], c) &&
1760 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1761 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1763 error = ttysleep(tp, &lbolt, PCATCH,
1772 * Interpret EOF only in canonical mode.
1774 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1777 * Give user character.
1779 error = ureadc(c, uio);
1781 /* XXX should ungetc(c, qp). */
1783 if (uio->uio_resid == 0)
1786 * In canonical mode check for a "break character"
1787 * marking the end of a "line of input".
1789 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1796 * Look to unblock input now that (presumably)
1797 * the input queue has gone down.
1800 if (ISSET(tp->t_state, TS_TBLOCK) &&
1801 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1809 * Check the output queue on tp for space for a kernel message (from uprintf
1810 * or tprintf). Allow some space over the normal hiwater mark so we don't
1811 * lose messages due to normal flow control, but don't let the tty run amok.
1812 * Sleeps here are not interruptible, but we return prematurely if new signals
1816 ttycheckoutq(struct tty *tp, int wait)
1818 struct lwp *lp = curthread->td_lwp;
1820 sigset_t oldset, newset;
1822 hiwat = tp->t_ohiwat;
1823 SIGEMPTYSET(oldset);
1824 SIGEMPTYSET(newset);
1827 oldset = lwp_sigpend(lp);
1828 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1829 while (tp->t_outq.c_cc > hiwat) {
1831 if (tp->t_outq.c_cc <= hiwat)
1834 newset = lwp_sigpend(lp);
1835 if (!wait || SIGSETNEQ(oldset, newset)) {
1839 SET(tp->t_state, TS_SO_OLOWAT);
1840 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1848 * Process a write call on a tty device.
1851 ttwrite(struct tty *tp, struct uio *uio, int flag)
1857 int i, hiwat, error;
1862 lp = curthread->td_lwp;
1863 hiwat = tp->t_ohiwat;
1864 cnt = uio->uio_resid;
1869 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1871 if (uio->uio_resid == cnt)
1875 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1876 if (flag & IO_NDELAY) {
1878 error = EWOULDBLOCK;
1881 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1890 * Hang the process if it's in the background.
1892 if ((pp = curproc) && isbackground(pp, tp) &&
1893 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1894 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1895 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1896 if (pp->p_pgrp->pg_jobc == 0) {
1900 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1901 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1907 * Process the user's data in at most OBUFSIZ chunks. Perform any
1908 * output translation. Keep track of high water mark, sleep on
1909 * overflow awaiting device aid in acquiring new space.
1911 while (uio->uio_resid > 0 || cc > 0) {
1912 if (ISSET(tp->t_lflag, FLUSHO)) {
1916 if (tp->t_outq.c_cc > hiwat)
1919 * Grab a hunk of data from the user, unless we have some
1920 * leftover from last time.
1923 cc = szmin(uio->uio_resid, OBUFSIZ);
1925 error = uiomove(cp, (size_t)cc, uio);
1932 * If nothing fancy need be done, grab those characters we
1933 * can handle without any of ttyoutput's processing and
1934 * just transfer them to the output q. For those chars
1935 * which require special processing (as indicated by the
1936 * bits in char_type), call ttyoutput. After processing
1937 * a hunk of data, look for FLUSHO so ^O's will take effect
1941 if (!ISSET(tp->t_oflag, OPOST))
1944 ce = cc - scanc((u_int)cc, (u_char *)cp,
1945 char_type, CCLASSMASK);
1947 * If ce is zero, then we're processing
1948 * a special character through ttyoutput.
1952 if (ttyoutput(*cp, tp) >= 0) {
1953 /* No Clists, wait a bit. */
1955 if (flag & IO_NDELAY) {
1956 error = EWOULDBLOCK;
1959 error = ttysleep(tp, &lbolt,
1968 if (ISSET(tp->t_lflag, FLUSHO) ||
1969 tp->t_outq.c_cc > hiwat)
1975 * A bunch of normal characters have been found.
1976 * Transfer them en masse to the output queue and
1977 * continue processing at the top of the loop.
1978 * If there are any further characters in this
1979 * <= OBUFSIZ chunk, the first should be a character
1980 * requiring special handling by ttyoutput.
1983 i = b_to_q(cp, ce, &tp->t_outq);
1986 cp += ce, cc -= ce, tk_nout += ce;
1989 /* No Clists, wait a bit. */
1991 if (flag & IO_NDELAY) {
1992 error = EWOULDBLOCK;
1995 error = ttysleep(tp, &lbolt, PCATCH,
2001 if (ISSET(tp->t_lflag, FLUSHO) ||
2002 tp->t_outq.c_cc > hiwat)
2009 * If cc is nonzero, we leave the uio structure inconsistent, as the
2010 * offset and iov pointers have moved forward, but it doesn't matter
2011 * (the call will either return short or restart with a new uio).
2013 uio->uio_resid += cc;
2020 * This can only occur if FLUSHO is set in t_lflag,
2021 * or if ttstart/oproc is synchronous (or very fast).
2023 if (tp->t_outq.c_cc <= hiwat) {
2027 if (flag & IO_NDELAY) {
2029 uio->uio_resid += cc;
2030 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2032 SET(tp->t_state, TS_SO_OLOWAT);
2033 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2035 if (error == EWOULDBLOCK)
2043 * Rubout one character from the rawq of tp
2044 * as cleanly as possible.
2047 ttyrub(int c, struct tty *tp)
2053 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2055 CLR(tp->t_lflag, FLUSHO);
2056 if (ISSET(tp->t_lflag, ECHOE)) {
2057 if (tp->t_rocount == 0) {
2059 * Screwed by ttwrite; retype
2064 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2067 CLR(c, ~TTY_CHARMASK);
2068 switch (CCLASS(c)) {
2077 if (ISSET(tp->t_lflag, ECHOCTL))
2081 if (tp->t_rocount < tp->t_rawq.c_cc) {
2086 savecol = tp->t_column;
2087 SET(tp->t_state, TS_CNTTB);
2088 SET(tp->t_lflag, FLUSHO);
2089 tp->t_column = tp->t_rocol;
2090 cp = tp->t_rawq.c_cf;
2092 tabc = *cp; /* XXX FIX NEXTC */
2093 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2095 CLR(tp->t_lflag, FLUSHO);
2096 CLR(tp->t_state, TS_CNTTB);
2099 /* savecol will now be length of the tab. */
2100 savecol -= tp->t_column;
2101 tp->t_column += savecol;
2103 savecol = 8; /* overflow screw */
2104 while (--savecol >= 0)
2105 (void)ttyoutput('\b', tp);
2108 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2109 (void)kprintf(PANICSTR, c, CCLASS(c));
2111 panic(PANICSTR, c, CCLASS(c));
2115 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2116 if (!ISSET(tp->t_state, TS_ERASE)) {
2117 SET(tp->t_state, TS_ERASE);
2118 (void)ttyoutput('\\', tp);
2122 ttyecho(tp->t_cc[VERASE], tp);
2124 * This code may be executed not only when an ERASE key
2125 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2126 * So, I didn't think it was worthwhile to pass the extra
2127 * information (which would need an extra parameter,
2128 * changing every call) needed to distinguish the ERASE2
2129 * case from the ERASE.
2136 * Back over cnt characters, erasing them.
2139 ttyrubo(struct tty *tp, int cnt)
2143 (void)ttyoutput('\b', tp);
2144 (void)ttyoutput(' ', tp);
2145 (void)ttyoutput('\b', tp);
2151 * Reprint the rawq line. Note, it is assumed that c_cc has already
2155 ttyretype(struct tty *tp)
2160 /* Echo the reprint character. */
2161 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2162 ttyecho(tp->t_cc[VREPRINT], tp);
2164 (void)ttyoutput('\n', tp);
2168 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2169 * BIT OF FIRST CHAR.
2172 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2173 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2175 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2176 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2178 CLR(tp->t_state, TS_ERASE);
2181 tp->t_rocount = tp->t_rawq.c_cc;
2186 * Echo a typed character to the terminal.
2189 ttyecho(int c, struct tty *tp)
2192 if (!ISSET(tp->t_state, TS_CNTTB))
2193 CLR(tp->t_lflag, FLUSHO);
2194 if ((!ISSET(tp->t_lflag, ECHO) &&
2195 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2196 ISSET(tp->t_lflag, EXTPROC))
2198 if (ISSET(tp->t_lflag, ECHOCTL) &&
2199 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2200 ISSET(c, TTY_CHARMASK) == 0177)) {
2201 (void)ttyoutput('^', tp);
2202 CLR(c, ~TTY_CHARMASK);
2208 (void)ttyoutput(c, tp);
2212 * Wake up any readers on a tty.
2215 ttwakeup(struct tty *tp)
2218 if (tp->t_rsel.si_pid != 0)
2219 selwakeup(&tp->t_rsel);
2220 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2221 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2222 wakeup(TSA_HUP_OR_INPUT(tp));
2223 KNOTE(&tp->t_rsel.si_note, 0);
2227 * Wake up any writers on a tty.
2230 ttwwakeup(struct tty *tp)
2233 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2234 selwakeup(&tp->t_wsel);
2235 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2236 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2237 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2238 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2239 CLR(tp->t_state, TS_SO_OCOMPLETE);
2240 wakeup(TSA_OCOMPLETE(tp));
2242 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2243 tp->t_outq.c_cc <= tp->t_olowat) {
2244 CLR(tp->t_state, TS_SO_OLOWAT);
2245 wakeup(TSA_OLOWAT(tp));
2247 KNOTE(&tp->t_wsel.si_note, 0);
2251 * Look up a code for a specified speed in a conversion table;
2252 * used by drivers to map software speed values to hardware parameters.
2255 ttspeedtab(int speed, struct speedtab *table)
2258 for ( ; table->sp_speed != -1; table++)
2259 if (table->sp_speed == speed)
2260 return (table->sp_code);
2265 * Set input and output watermarks and buffer sizes. For input, the
2266 * high watermark is about one second's worth of input above empty, the
2267 * low watermark is slightly below high water, and the buffer size is a
2268 * driver-dependent amount above high water. For output, the watermarks
2269 * are near the ends of the buffer, with about 1 second's worth of input
2270 * between them. All this only applies to the standard line discipline.
2273 ttsetwater(struct tty *tp)
2275 int cps, ttmaxhiwat, x;
2278 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2279 switch (tp->t_ispeedwat) {
2281 cps = tp->t_ispeed / 10;
2285 * This case is for old drivers that don't know about
2286 * t_ispeedwat. Arrange for them to get the old buffer
2287 * sizes and watermarks.
2289 cps = TTYHOG - 2 * 256;
2290 tp->t_ififosize = 2 * 2048;
2293 cps = tp->t_ispeedwat / 10;
2297 tp->t_ilowat = 7 * cps / 8;
2298 x = cps + tp->t_ififosize;
2299 clist_alloc_cblocks(&tp->t_rawq, x, x);
2302 switch (tp->t_ospeedwat) {
2304 cps = tp->t_ospeed / 10;
2305 ttmaxhiwat = 2 * TTMAXHIWAT;
2308 cps = tp->t_ospeed / 10;
2309 ttmaxhiwat = TTMAXHIWAT;
2312 cps = tp->t_ospeedwat / 10;
2313 ttmaxhiwat = 8 * TTMAXHIWAT;
2316 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2317 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2319 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2320 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2321 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2323 clist_alloc_cblocks(&tp->t_outq, x, x);
2328 * Report on state of foreground process group.
2331 ttyinfo(struct tty *tp)
2333 struct proc *p, *pick;
2338 if (ttycheckoutq(tp,0) == 0)
2342 * We always print the load average, then figure out what else to
2343 * print based on the state of the current process group.
2345 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2346 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2348 if (tp->t_session == NULL) {
2349 ttyprintf(tp, "not a controlling terminal\n");
2350 } else if (tp->t_pgrp == NULL) {
2351 ttyprintf(tp, "no foreground process group\n");
2352 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2353 ttyprintf(tp, "empty foreground process group\n");
2356 * Pick an interesting process. Note that certain elements,
2357 * in particular the wmesg, require a critical section for
2358 * safe access (YYY and we are still not MP safe).
2360 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2369 /* XXX lwp should compare lwps */
2371 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2372 if (proc_compare(pick, p))
2377 lp = FIRST_LWP_IN_PROC(pick);
2379 ttyprintf(tp, "foreground process without lwp\n");
2386 * Figure out what wait/process-state message, and command
2390 * XXX lwp This is a horrible mixture. We need to rework this
2391 * as soon as lwps have their own runnable status.
2393 if (pick->p_flag & P_WEXIT)
2395 else if (lp->lwp_stat == LSRUN)
2397 else if (pick->p_stat == SIDL)
2399 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2400 str = lp->lwp_wmesg;
2404 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2405 pick->p_comm, pick->p_pid, str);
2408 * Calculate cpu usage, percent cpu, and cmsz. Note that
2409 * 'pick' becomes invalid the moment we exit the critical
2412 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2413 calcru_proc(pick, &ru);
2415 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2417 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2420 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2427 ttyprintf(tp, " %s ", buf);
2428 ttyprintf(tp, "%ld.%02ldu ",
2429 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2430 ttyprintf(tp, "%ld.%02lds ",
2431 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2432 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2434 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2438 * Returns 1 if p2 is "better" than p1
2440 * The algorithm for picking the "interesting" process is thus:
2442 * 1) Only foreground processes are eligible - implied.
2443 * 2) Runnable processes are favored over anything else. The runner
2444 * with the highest cpu utilization is picked (p_cpticks). Ties are
2445 * broken by picking the highest pid.
2446 * 3) The sleeper with the shortest sleep time is next. With ties,
2447 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2448 * 4) Further ties are broken by picking the highest pid.
2450 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2451 #define TESTAB(a, b) ((a)<<1 | (b))
2457 proc_compare(struct proc *p1, struct proc *p2)
2459 struct lwp *lp1, *lp2;
2466 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2472 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2476 lp1 = FIRST_LWP_IN_PROC(p1);
2477 lp2 = FIRST_LWP_IN_PROC(p2);
2480 * see if at least one of them is runnable
2482 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2489 * tie - favor one with highest recent cpu utilization
2491 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2493 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2495 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2498 * pick the one with the smallest sleep time
2500 if (lp2->lwp_slptime > lp1->lwp_slptime)
2502 if (lp1->lwp_slptime > lp2->lwp_slptime)
2505 * favor one sleeping in a non-interruptible sleep
2507 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2509 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2511 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2515 * Output char to tty; console putchar style.
2518 tputchar(int c, struct tty *tp)
2521 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2526 (void)ttyoutput('\r', tp);
2527 (void)ttyoutput(c, tp);
2534 * Sleep on chan, returning ERESTART if tty changed while we napped and
2535 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2536 * the tty is revoked, restarting a pending call will redo validation done
2537 * at the start of the call.
2540 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2546 error = tsleep(chan, slpflags, wmesg, timo);
2549 return (tp->t_gen == gen ? 0 : ERESTART);
2555 * We bump the gen to force any ttysleep()'s to return with ERESTART
2556 * and flush the tty. The related fp's should already have been
2557 * replaced so the tty will close when the last references on the
2558 * original fp's go away.
2561 ttyrevoke(struct dev_revoke_args *ap)
2565 tp = ap->a_head.a_dev->si_tty;
2567 ttyflush(tp, FREAD | FWRITE);
2568 wakeup(TSA_CARR_ON(tp));
2575 * Allocate a tty struct. Clists in the struct will be allocated by
2579 ttymalloc(struct tty *tp)
2585 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2592 * Free a tty struct. Clists in the struct should have been freed by
2595 * XXX not yet usable: since we support a half-closed state and do not
2596 * ref count the tty reference from the session, it is possible for a
2597 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2600 ttyfree(struct tty *tp)
2607 ttyregister(struct tty *tp)
2609 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2613 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2617 SLIST_FOREACH(tp, &tty_list, t_list) {
2620 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
2621 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2628 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2629 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2632 nottystop(struct tty *tp, int rw)
2639 ttyread(struct dev_read_args *ap)
2643 tp = ap->a_head.a_dev->si_tty;
2646 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2650 ttywrite(struct dev_write_args *ap)
2654 tp = ap->a_head.a_dev->si_tty;
2657 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));