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 { FILTEROP_ISFD, NULL, filt_ttyrdetach, filt_ttyread };
1161 static struct filterops ttywrite_filtops =
1162 { FILTEROP_ISFD, 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_rkq.ki_note;
1176 kn->kn_fop = &ttyread_filtops;
1179 klist = &tp->t_wkq.ki_note;
1180 kn->kn_fop = &ttywrite_filtops;
1183 ap->a_result = EOPNOTSUPP;
1187 kn->kn_hook = (caddr_t)dev;
1188 knote_insert(klist, kn);
1194 filt_ttyrdetach(struct knote *kn)
1196 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1198 knote_remove(&tp->t_rkq.ki_note, kn);
1202 filt_ttyread(struct knote *kn, long hint)
1204 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1206 kn->kn_data = ttnread(tp);
1207 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1208 kn->kn_flags |= EV_EOF;
1211 return (kn->kn_data > 0);
1215 filt_ttywdetach(struct knote *kn)
1217 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1219 knote_remove(&tp->t_wkq.ki_note, kn);
1223 filt_ttywrite(struct knote *kn, long hint)
1225 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1227 kn->kn_data = tp->t_outq.c_cc;
1228 if (ISSET(tp->t_state, TS_ZOMBIE))
1230 return (kn->kn_data <= tp->t_olowat &&
1231 ISSET(tp->t_state, TS_CONNECTED));
1235 * Must be called while in a critical section.
1238 ttnread(struct tty *tp)
1242 if (ISSET(tp->t_lflag, PENDIN))
1244 nread = tp->t_canq.c_cc;
1245 if (!ISSET(tp->t_lflag, ICANON)) {
1246 nread += tp->t_rawq.c_cc;
1247 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1254 * Wait for output to drain.
1257 ttywait(struct tty *tp)
1263 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1264 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1266 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1267 ISSET(tp->t_state, TS_CONNECTED)) {
1268 SET(tp->t_state, TS_SO_OCOMPLETE);
1269 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1273 if (error == EWOULDBLOCK)
1280 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1287 * Flush if successfully wait.
1290 ttywflush(struct tty *tp)
1294 if ((error = ttywait(tp)) == 0)
1295 ttyflush(tp, FREAD);
1300 * Flush tty read and/or write queues, notifying anyone waiting.
1303 ttyflush(struct tty *tp, int rw)
1310 FLUSHQ(&tp->t_outq);
1311 CLR(tp->t_state, TS_TTSTOP);
1313 (*tp->t_stop)(tp, rw);
1315 FLUSHQ(&tp->t_canq);
1316 FLUSHQ(&tp->t_rawq);
1317 CLR(tp->t_lflag, PENDIN);
1320 CLR(tp->t_state, TS_LOCAL);
1322 if (ISSET(tp->t_state, TS_TBLOCK)) {
1324 FLUSHQ(&tp->t_outq);
1328 * Don't let leave any state that might clobber the
1329 * next line discipline (although we should do more
1330 * to send the START char). Not clearing the state
1331 * may have caused the "putc to a clist with no
1332 * reserved cblocks" panic/kprintf.
1334 CLR(tp->t_state, TS_TBLOCK);
1336 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1337 if (ISSET(tp->t_iflag, IXOFF)) {
1339 * XXX wait a bit in the hope that the stop
1340 * character (if any) will go out. Waiting
1341 * isn't good since it allows races. This
1342 * will be fixed when the stop character is
1343 * put in a special queue. Don't bother with
1344 * the checks in ttywait() since the timeout
1347 SET(tp->t_state, TS_SO_OCOMPLETE);
1348 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1351 * Don't try sending the stop character again.
1353 CLR(tp->t_state, TS_TBLOCK);
1360 FLUSHQ(&tp->t_outq);
1367 * Copy in the default termios characters.
1370 termioschars(struct termios *t)
1373 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1380 ttychars(struct tty *tp)
1383 termioschars(&tp->t_termios);
1387 * Handle input high water. Send stop character for the IXOFF case. Turn
1388 * on our input flow control bit and propagate the changes to the driver.
1389 * XXX the stop character should be put in a special high priority queue.
1392 ttyblock(struct tty *tp)
1395 SET(tp->t_state, TS_TBLOCK);
1396 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1397 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1398 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1403 * Handle input low water. Send start character for the IXOFF case. Turn
1404 * off our input flow control bit and propagate the changes to the driver.
1405 * XXX the start character should be put in a special high priority queue.
1408 ttyunblock(struct tty *tp)
1411 CLR(tp->t_state, TS_TBLOCK);
1412 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1413 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1414 SET(tp->t_state, TS_TBLOCK); /* try again later */
1419 /* Not used by any current (i386) drivers. */
1421 * Restart after an inter-char delay.
1424 ttrstrt(void *tp_arg)
1428 KASSERT(tp_arg != NULL, ("ttrstrt"));
1432 CLR(tp->t_state, TS_TIMEOUT);
1439 ttstart(struct tty *tp)
1442 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1448 * "close" a line discipline
1451 ttylclose(struct tty *tp, int flag)
1454 if (flag & FNONBLOCK || ttywflush(tp))
1455 ttyflush(tp, FREAD | FWRITE);
1460 * Handle modem control transition on a tty.
1461 * Flag indicates new state of carrier.
1462 * Returns 0 if the line should be turned off, otherwise 1.
1465 ttymodem(struct tty *tp, int flag)
1468 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1470 * MDMBUF: do flow control according to carrier flag
1471 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1472 * works if IXON and IXANY are clear.
1475 CLR(tp->t_state, TS_CAR_OFLOW);
1476 CLR(tp->t_state, TS_TTSTOP);
1478 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1479 SET(tp->t_state, TS_CAR_OFLOW);
1480 SET(tp->t_state, TS_TTSTOP);
1481 (*tp->t_stop)(tp, 0);
1483 } else if (flag == 0) {
1487 CLR(tp->t_state, TS_CARR_ON);
1488 if (ISSET(tp->t_state, TS_ISOPEN) &&
1489 !ISSET(tp->t_cflag, CLOCAL)) {
1490 SET(tp->t_state, TS_ZOMBIE);
1491 CLR(tp->t_state, TS_CONNECTED);
1492 if (tp->t_session && tp->t_session->s_leader)
1493 ksignal(tp->t_session->s_leader, SIGHUP);
1494 ttyflush(tp, FREAD | FWRITE);
1501 SET(tp->t_state, TS_CARR_ON);
1502 if (!ISSET(tp->t_state, TS_ZOMBIE))
1503 SET(tp->t_state, TS_CONNECTED);
1504 wakeup(TSA_CARR_ON(tp));
1512 * Reinput pending characters after state switch
1513 * call from a critical section.
1516 ttypend(struct tty *tp)
1521 CLR(tp->t_lflag, PENDIN);
1522 SET(tp->t_state, TS_TYPEN);
1524 * XXX this assumes too much about clist internals. It may even
1525 * fail if the cblock slush pool is empty. We can't allocate more
1526 * cblocks here because we are called from an interrupt handler
1527 * and clist_alloc_cblocks() can wait.
1530 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1531 tp->t_rawq.c_cbmax = tq.c_cbmax;
1532 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1533 while ((c = clist_getc(&tq)) >= 0)
1535 CLR(tp->t_state, TS_TYPEN);
1539 * Process a read call on a tty device.
1542 ttread(struct tty *tp, struct uio *uio, int flag)
1547 cc_t *cc = tp->t_cc;
1550 int first, error = 0;
1551 int has_stime = 0, last_cc = 0;
1552 long slp = 0; /* XXX this should be renamed `timo'. */
1553 struct timeval stime;
1555 lp = curthread->td_lwp;
1556 stime.tv_sec = 0; /* fix compiler warnings */
1561 lflag = tp->t_lflag;
1563 * take pending input first
1565 if (ISSET(lflag, PENDIN)) {
1567 splz(); /* reduce latency */
1568 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1572 * Hang process if it's in the background.
1574 if ((pp = curproc) && isbackground(pp, tp)) {
1576 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1577 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1578 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1580 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1581 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1587 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1589 return (0); /* EOF */
1593 * If canonical, use the canonical queue,
1594 * else use the raw queue.
1596 * (should get rid of clists...)
1598 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1600 if (flag & IO_NDELAY) {
1603 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1608 return (EWOULDBLOCK);
1610 if (!ISSET(lflag, ICANON)) {
1613 struct timeval timecopy;
1616 * Check each of the four combinations.
1617 * (m > 0 && t == 0) is the normal read case.
1618 * It should be fairly efficient, so we check that and its
1619 * companion case (m == 0 && t == 0) first.
1620 * For the other two cases, we compute the target sleep time
1629 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1633 t *= 100000; /* time in us */
1634 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1635 ((t1).tv_usec - (t2).tv_usec))
1641 getmicrotime(&timecopy);
1642 if (has_stime == 0) {
1643 /* first character, start timer */
1647 } else if (qp->c_cc > last_cc) {
1648 /* got a character, restart timer */
1652 /* nothing, check expiration */
1653 slp = t - diff(timecopy, stime);
1658 } else { /* m == 0 */
1661 getmicrotime(&timecopy);
1662 if (has_stime == 0) {
1667 slp = t - diff(timecopy, stime);
1669 /* Timed out, but 0 is enough input. */
1677 * Rounding down may make us wake up just short
1678 * of the target, so we round up.
1679 * The formula is ceiling(slp * hz/1000000).
1680 * 32-bit arithmetic is enough for hz < 169.
1681 * XXX see tvtohz() for how to avoid overflow if hz
1682 * is large (divide by `tick' and/or arrange to
1683 * use tvtohz() if hz is large).
1685 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1688 if (qp->c_cc <= 0) {
1691 * There is no input, or not enough input and we can block.
1693 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1694 ISSET(tp->t_state, TS_CONNECTED) ?
1695 "ttyin" : "ttyhup", (int)slp);
1697 if (error == EWOULDBLOCK)
1702 * XXX what happens if another process eats some input
1703 * while we are asleep (not just here)? It would be
1704 * safest to detect changes and reset our state variables
1705 * (has_stime and last_cc).
1713 * Input present, check for input mapping and processing.
1716 if (ISSET(lflag, ICANON | ISIG))
1722 icc = (int)szmin(uio->uio_resid, IBUFSIZ);
1723 icc = q_to_b(qp, ibuf, icc);
1729 error = uiomove(ibuf, (size_t)icc, uio);
1731 * XXX if there was an error then we should ungetc() the
1732 * unmoved chars and reduce icc here.
1736 if (uio->uio_resid == 0)
1750 * delayed suspend (^Y)
1752 if (CCEQ(cc[VDSUSP], c) &&
1753 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1754 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1756 error = ttysleep(tp, &lbolt, PCATCH,
1765 * Interpret EOF only in canonical mode.
1767 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1770 * Give user character.
1772 error = ureadc(c, uio);
1774 /* XXX should ungetc(c, qp). */
1776 if (uio->uio_resid == 0)
1779 * In canonical mode check for a "break character"
1780 * marking the end of a "line of input".
1782 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1789 * Look to unblock input now that (presumably)
1790 * the input queue has gone down.
1793 if (ISSET(tp->t_state, TS_TBLOCK) &&
1794 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1802 * Check the output queue on tp for space for a kernel message (from uprintf
1803 * or tprintf). Allow some space over the normal hiwater mark so we don't
1804 * lose messages due to normal flow control, but don't let the tty run amok.
1805 * Sleeps here are not interruptible, but we return prematurely if new signals
1809 ttycheckoutq(struct tty *tp, int wait)
1811 struct lwp *lp = curthread->td_lwp;
1813 sigset_t oldset, newset;
1815 hiwat = tp->t_ohiwat;
1816 SIGEMPTYSET(oldset);
1817 SIGEMPTYSET(newset);
1820 oldset = lwp_sigpend(lp);
1821 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1822 while (tp->t_outq.c_cc > hiwat) {
1824 if (tp->t_outq.c_cc <= hiwat)
1827 newset = lwp_sigpend(lp);
1828 if (!wait || SIGSETNEQ(oldset, newset)) {
1832 SET(tp->t_state, TS_SO_OLOWAT);
1833 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1841 * Process a write call on a tty device.
1844 ttwrite(struct tty *tp, struct uio *uio, int flag)
1850 int i, hiwat, error;
1855 lp = curthread->td_lwp;
1856 hiwat = tp->t_ohiwat;
1857 cnt = uio->uio_resid;
1862 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1864 if (uio->uio_resid == cnt)
1868 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1869 if (flag & IO_NDELAY) {
1871 error = EWOULDBLOCK;
1874 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1883 * Hang the process if it's in the background.
1885 if ((pp = curproc) && isbackground(pp, tp) &&
1886 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1887 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1888 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1889 if (pp->p_pgrp->pg_jobc == 0) {
1893 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1894 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1900 * Process the user's data in at most OBUFSIZ chunks. Perform any
1901 * output translation. Keep track of high water mark, sleep on
1902 * overflow awaiting device aid in acquiring new space.
1904 while (uio->uio_resid > 0 || cc > 0) {
1905 if (ISSET(tp->t_lflag, FLUSHO)) {
1909 if (tp->t_outq.c_cc > hiwat)
1912 * Grab a hunk of data from the user, unless we have some
1913 * leftover from last time.
1916 cc = szmin(uio->uio_resid, OBUFSIZ);
1918 error = uiomove(cp, (size_t)cc, uio);
1925 * If nothing fancy need be done, grab those characters we
1926 * can handle without any of ttyoutput's processing and
1927 * just transfer them to the output q. For those chars
1928 * which require special processing (as indicated by the
1929 * bits in char_type), call ttyoutput. After processing
1930 * a hunk of data, look for FLUSHO so ^O's will take effect
1934 if (!ISSET(tp->t_oflag, OPOST))
1937 ce = cc - scanc((u_int)cc, (u_char *)cp,
1938 char_type, CCLASSMASK);
1940 * If ce is zero, then we're processing
1941 * a special character through ttyoutput.
1945 if (ttyoutput(*cp, tp) >= 0) {
1946 /* No Clists, wait a bit. */
1948 if (flag & IO_NDELAY) {
1949 error = EWOULDBLOCK;
1952 error = ttysleep(tp, &lbolt,
1961 if (ISSET(tp->t_lflag, FLUSHO) ||
1962 tp->t_outq.c_cc > hiwat)
1968 * A bunch of normal characters have been found.
1969 * Transfer them en masse to the output queue and
1970 * continue processing at the top of the loop.
1971 * If there are any further characters in this
1972 * <= OBUFSIZ chunk, the first should be a character
1973 * requiring special handling by ttyoutput.
1976 i = b_to_q(cp, ce, &tp->t_outq);
1979 cp += ce, cc -= ce, tk_nout += ce;
1982 /* No Clists, wait a bit. */
1984 if (flag & IO_NDELAY) {
1985 error = EWOULDBLOCK;
1988 error = ttysleep(tp, &lbolt, PCATCH,
1994 if (ISSET(tp->t_lflag, FLUSHO) ||
1995 tp->t_outq.c_cc > hiwat)
2002 * If cc is nonzero, we leave the uio structure inconsistent, as the
2003 * offset and iov pointers have moved forward, but it doesn't matter
2004 * (the call will either return short or restart with a new uio).
2006 uio->uio_resid += cc;
2013 * This can only occur if FLUSHO is set in t_lflag,
2014 * or if ttstart/oproc is synchronous (or very fast).
2016 if (tp->t_outq.c_cc <= hiwat) {
2020 if (flag & IO_NDELAY) {
2022 uio->uio_resid += cc;
2023 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2025 SET(tp->t_state, TS_SO_OLOWAT);
2026 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2028 if (error == EWOULDBLOCK)
2036 * Rubout one character from the rawq of tp
2037 * as cleanly as possible.
2040 ttyrub(int c, struct tty *tp)
2046 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2048 CLR(tp->t_lflag, FLUSHO);
2049 if (ISSET(tp->t_lflag, ECHOE)) {
2050 if (tp->t_rocount == 0) {
2052 * Screwed by ttwrite; retype
2057 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2060 CLR(c, ~TTY_CHARMASK);
2061 switch (CCLASS(c)) {
2070 if (ISSET(tp->t_lflag, ECHOCTL))
2074 if (tp->t_rocount < tp->t_rawq.c_cc) {
2079 savecol = tp->t_column;
2080 SET(tp->t_state, TS_CNTTB);
2081 SET(tp->t_lflag, FLUSHO);
2082 tp->t_column = tp->t_rocol;
2083 cp = tp->t_rawq.c_cf;
2085 tabc = *cp; /* XXX FIX NEXTC */
2086 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2088 CLR(tp->t_lflag, FLUSHO);
2089 CLR(tp->t_state, TS_CNTTB);
2092 /* savecol will now be length of the tab. */
2093 savecol -= tp->t_column;
2094 tp->t_column += savecol;
2096 savecol = 8; /* overflow screw */
2097 while (--savecol >= 0)
2098 (void)ttyoutput('\b', tp);
2101 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2102 (void)kprintf(PANICSTR, c, CCLASS(c));
2104 panic(PANICSTR, c, CCLASS(c));
2108 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2109 if (!ISSET(tp->t_state, TS_ERASE)) {
2110 SET(tp->t_state, TS_ERASE);
2111 (void)ttyoutput('\\', tp);
2115 ttyecho(tp->t_cc[VERASE], tp);
2117 * This code may be executed not only when an ERASE key
2118 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2119 * So, I didn't think it was worthwhile to pass the extra
2120 * information (which would need an extra parameter,
2121 * changing every call) needed to distinguish the ERASE2
2122 * case from the ERASE.
2129 * Back over cnt characters, erasing them.
2132 ttyrubo(struct tty *tp, int cnt)
2136 (void)ttyoutput('\b', tp);
2137 (void)ttyoutput(' ', tp);
2138 (void)ttyoutput('\b', tp);
2144 * Reprint the rawq line. Note, it is assumed that c_cc has already
2148 ttyretype(struct tty *tp)
2153 /* Echo the reprint character. */
2154 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2155 ttyecho(tp->t_cc[VREPRINT], tp);
2157 (void)ttyoutput('\n', tp);
2161 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2162 * BIT OF FIRST CHAR.
2165 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2166 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2168 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2169 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2171 CLR(tp->t_state, TS_ERASE);
2174 tp->t_rocount = tp->t_rawq.c_cc;
2179 * Echo a typed character to the terminal.
2182 ttyecho(int c, struct tty *tp)
2185 if (!ISSET(tp->t_state, TS_CNTTB))
2186 CLR(tp->t_lflag, FLUSHO);
2187 if ((!ISSET(tp->t_lflag, ECHO) &&
2188 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2189 ISSET(tp->t_lflag, EXTPROC))
2191 if (ISSET(tp->t_lflag, ECHOCTL) &&
2192 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2193 ISSET(c, TTY_CHARMASK) == 0177)) {
2194 (void)ttyoutput('^', tp);
2195 CLR(c, ~TTY_CHARMASK);
2201 (void)ttyoutput(c, tp);
2205 * Wake up any readers on a tty.
2208 ttwakeup(struct tty *tp)
2211 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2212 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2213 wakeup(TSA_HUP_OR_INPUT(tp));
2214 KNOTE(&tp->t_rkq.ki_note, 0);
2218 * Wake up any writers on a tty.
2221 ttwwakeup(struct tty *tp)
2224 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2225 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2226 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2227 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2228 CLR(tp->t_state, TS_SO_OCOMPLETE);
2229 wakeup(TSA_OCOMPLETE(tp));
2231 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2232 tp->t_outq.c_cc <= tp->t_olowat) {
2233 CLR(tp->t_state, TS_SO_OLOWAT);
2234 wakeup(TSA_OLOWAT(tp));
2236 KNOTE(&tp->t_wkq.ki_note, 0);
2240 * Look up a code for a specified speed in a conversion table;
2241 * used by drivers to map software speed values to hardware parameters.
2244 ttspeedtab(int speed, struct speedtab *table)
2247 for ( ; table->sp_speed != -1; table++)
2248 if (table->sp_speed == speed)
2249 return (table->sp_code);
2254 * Set input and output watermarks and buffer sizes. For input, the
2255 * high watermark is about one second's worth of input above empty, the
2256 * low watermark is slightly below high water, and the buffer size is a
2257 * driver-dependent amount above high water. For output, the watermarks
2258 * are near the ends of the buffer, with about 1 second's worth of input
2259 * between them. All this only applies to the standard line discipline.
2262 ttsetwater(struct tty *tp)
2264 int cps, ttmaxhiwat, x;
2267 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2268 switch (tp->t_ispeedwat) {
2270 cps = tp->t_ispeed / 10;
2274 * This case is for old drivers that don't know about
2275 * t_ispeedwat. Arrange for them to get the old buffer
2276 * sizes and watermarks.
2278 cps = TTYHOG - 2 * 256;
2279 tp->t_ififosize = 2 * 2048;
2282 cps = tp->t_ispeedwat / 10;
2286 tp->t_ilowat = 7 * cps / 8;
2287 x = cps + tp->t_ififosize;
2288 clist_alloc_cblocks(&tp->t_rawq, x, x);
2291 switch (tp->t_ospeedwat) {
2293 cps = tp->t_ospeed / 10;
2294 ttmaxhiwat = 2 * TTMAXHIWAT;
2297 cps = tp->t_ospeed / 10;
2298 ttmaxhiwat = TTMAXHIWAT;
2301 cps = tp->t_ospeedwat / 10;
2302 ttmaxhiwat = 8 * TTMAXHIWAT;
2305 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2306 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2308 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2309 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2310 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2312 clist_alloc_cblocks(&tp->t_outq, x, x);
2317 * Report on state of foreground process group.
2320 ttyinfo(struct tty *tp)
2322 struct proc *p, *pick;
2327 if (ttycheckoutq(tp,0) == 0)
2331 * We always print the load average, then figure out what else to
2332 * print based on the state of the current process group.
2334 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2335 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2337 if (tp->t_session == NULL) {
2338 ttyprintf(tp, "not a controlling terminal\n");
2339 } else if (tp->t_pgrp == NULL) {
2340 ttyprintf(tp, "no foreground process group\n");
2341 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2342 ttyprintf(tp, "empty foreground process group\n");
2345 * Pick an interesting process. Note that certain elements,
2346 * in particular the wmesg, require a critical section for
2347 * safe access (YYY and we are still not MP safe).
2349 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2358 /* XXX lwp should compare lwps */
2360 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2361 if (proc_compare(pick, p))
2366 lp = FIRST_LWP_IN_PROC(pick);
2368 ttyprintf(tp, "foreground process without lwp\n");
2375 * Figure out what wait/process-state message, and command
2379 * XXX lwp This is a horrible mixture. We need to rework this
2380 * as soon as lwps have their own runnable status.
2382 if (pick->p_flag & P_WEXIT)
2384 else if (lp->lwp_stat == LSRUN)
2386 else if (pick->p_stat == SIDL)
2388 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2389 str = lp->lwp_wmesg;
2393 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2394 pick->p_comm, pick->p_pid, str);
2397 * Calculate cpu usage, percent cpu, and cmsz. Note that
2398 * 'pick' becomes invalid the moment we exit the critical
2401 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2402 calcru_proc(pick, &ru);
2404 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2406 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2409 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2416 ttyprintf(tp, " %s ", buf);
2417 ttyprintf(tp, "%ld.%02ldu ",
2418 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2419 ttyprintf(tp, "%ld.%02lds ",
2420 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2421 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2423 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2427 * Returns 1 if p2 is "better" than p1
2429 * The algorithm for picking the "interesting" process is thus:
2431 * 1) Only foreground processes are eligible - implied.
2432 * 2) Runnable processes are favored over anything else. The runner
2433 * with the highest cpu utilization is picked (p_cpticks). Ties are
2434 * broken by picking the highest pid.
2435 * 3) The sleeper with the shortest sleep time is next. With ties,
2436 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2437 * 4) Further ties are broken by picking the highest pid.
2439 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2440 #define TESTAB(a, b) ((a)<<1 | (b))
2446 proc_compare(struct proc *p1, struct proc *p2)
2448 struct lwp *lp1, *lp2;
2455 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2461 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2465 lp1 = FIRST_LWP_IN_PROC(p1);
2466 lp2 = FIRST_LWP_IN_PROC(p2);
2469 * see if at least one of them is runnable
2471 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2478 * tie - favor one with highest recent cpu utilization
2480 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2482 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2484 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2487 * pick the one with the smallest sleep time
2489 if (lp2->lwp_slptime > lp1->lwp_slptime)
2491 if (lp1->lwp_slptime > lp2->lwp_slptime)
2494 * favor one sleeping in a non-interruptible sleep
2496 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2498 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2500 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2504 * Output char to tty; console putchar style.
2507 tputchar(int c, struct tty *tp)
2510 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2515 (void)ttyoutput('\r', tp);
2516 (void)ttyoutput(c, tp);
2523 * Sleep on chan, returning ERESTART if tty changed while we napped and
2524 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2525 * the tty is revoked, restarting a pending call will redo validation done
2526 * at the start of the call.
2529 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2535 error = tsleep(chan, slpflags, wmesg, timo);
2538 return (tp->t_gen == gen ? 0 : ERESTART);
2544 * We bump the gen to force any ttysleep()'s to return with ERESTART
2545 * and flush the tty. The related fp's should already have been
2546 * replaced so the tty will close when the last references on the
2547 * original fp's go away.
2550 ttyrevoke(struct dev_revoke_args *ap)
2554 tp = ap->a_head.a_dev->si_tty;
2556 ttyflush(tp, FREAD | FWRITE);
2557 wakeup(TSA_CARR_ON(tp));
2564 * Allocate a tty struct. Clists in the struct will be allocated by
2568 ttymalloc(struct tty *tp)
2574 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2581 * Free a tty struct. Clists in the struct should have been freed by
2584 * XXX not yet usable: since we support a half-closed state and do not
2585 * ref count the tty reference from the session, it is possible for a
2586 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2589 ttyfree(struct tty *tp)
2596 ttyregister(struct tty *tp)
2598 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2602 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2606 SLIST_FOREACH(tp, &tty_list, t_list) {
2609 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
2610 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2617 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2618 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2621 nottystop(struct tty *tp, int rw)
2628 ttyread(struct dev_read_args *ap)
2632 tp = ap->a_head.a_dev->si_tty;
2635 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2639 ttywrite(struct dev_write_args *ap)
2643 tp = ap->a_head.a_dev->si_tty;
2646 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));