2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
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20 * This product includes software developed by the University of
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22 * 4. Neither the name of the University nor the names of its contributors
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
84 #include <sys/clist.h>
86 #include <sys/fcntl.h>
88 #include <sys/dkstat.h>
90 #include <sys/kernel.h>
91 #include <sys/vnode.h>
92 #include <sys/signalvar.h>
93 #include <sys/signal2.h>
94 #include <sys/resourcevar.h>
95 #include <sys/malloc.h>
96 #include <sys/filedesc.h>
97 #include <sys/sysctl.h>
98 #include <sys/thread2.h>
101 #include <sys/lock.h>
103 #include <vm/vm_map.h>
105 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
107 static int proc_compare (struct proc *p1, struct proc *p2);
108 static int ttnread (struct tty *tp);
109 static void ttyecho (int c, struct tty *tp);
110 static int ttyoutput (int c, struct tty *tp);
111 static void ttypend (struct tty *tp);
112 static void ttyretype (struct tty *tp);
113 static void ttyrub (int c, struct tty *tp);
114 static void ttyrubo (struct tty *tp, int cnt);
115 static void ttyunblock (struct tty *tp);
116 static int ttywflush (struct tty *tp);
117 static int filt_ttyread (struct knote *kn, long hint);
118 static void filt_ttyrdetach (struct knote *kn);
119 static int filt_ttywrite (struct knote *kn, long hint);
120 static void filt_ttywdetach (struct knote *kn);
123 * Table with character classes and parity. The 8th bit indicates parity,
124 * the 7th bit indicates the character is an alphameric or underscore (for
125 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
126 * are 0 then the character needs no special processing on output; classes
127 * other than 0 might be translated or (not currently) require delays.
129 #define E 0x00 /* Even parity. */
130 #define O 0x80 /* Odd parity. */
131 #define PARITY(c) (char_type[c] & O)
133 #define ALPHA 0x40 /* Alpha or underscore. */
134 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
136 #define CCLASSMASK 0x3f
137 #define CCLASS(c) (char_type[c] & CCLASSMASK)
142 #define NA ORDINARY | ALPHA
148 static u_char const char_type[] = {
149 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
150 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
151 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
152 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
153 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
154 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
156 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
157 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
159 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
160 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
161 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
163 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
164 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
166 * Meta chars; should be settable per character set;
167 * for now, treat them all as normal characters.
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
183 NA, NA, NA, NA, NA, NA, NA, NA,
184 NA, NA, NA, NA, NA, NA, NA, NA,
195 /* Macros to clear/set/test flags. */
196 #define SET(t, f) (t) |= (f)
197 #define CLR(t, f) (t) &= ~(f)
198 #define ISSET(t, f) ((t) & (f))
200 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
201 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
204 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
205 "LU", "TTY input statistic");
207 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
208 "LU", "TTY output statistic");
212 * list of struct tty where pstat(8) can pick it up with sysctl
214 static SLIST_HEAD(, tty) tty_list;
217 * Initial open of tty, or (re)entry to standard tty line discipline.
220 ttyopen(cdev_t device, struct tty *tp)
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
245 ttyclose(struct tty *tp)
247 funsetown(tp->t_sigio);
252 ttyflush(tp, FREAD | FWRITE);
253 clist_free_cblocks(&tp->t_canq);
254 clist_free_cblocks(&tp->t_outq);
255 clist_free_cblocks(&tp->t_rawq);
258 tp->t_line = TTYDISC;
266 * Disassociate the tty from its session. Traditionally this has only been
267 * a half-close, meaning that the session was still allowed to point at the
268 * tty (resulting in the tty in the ps command showing something like 'p0-'),
269 * even though the tty is no longer pointing at the session.
271 * The half close seems to be useful only for 'ps' output but there is as
272 * yet no reason to remove the feature. The full-close code is currently
273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
276 ttyclearsession(struct tty *tp)
281 if ((sp = tp->t_session) != NULL) {
282 tp->t_session = NULL;
283 #ifdef TTY_DO_FULL_CLOSE
284 /* FULL CLOSE (not yet) */
285 if (sp->s_ttyp == tp) {
288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
289 "%p/%p\n", sp->s_ttyp, tp);
296 * Release the tty vnode association for a session. This is the
297 * 'other half' of the close. Because multiple opens of /dev/tty
298 * only generate a single open to the actual tty, the file modes
299 * are locked to FREAD|FWRITE.
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
305 ttyclosesession(struct session *sp, int dorevoke)
311 * There may not be a controlling terminal or it may have been closed
314 if ((vp = sp->s_ttyvp) == NULL)
318 * We need a lock if we have to close or revoke.
320 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
322 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
328 * Retry if the vnode was ripped out from under us
330 if (vp != sp->s_ttyvp) {
337 * Close and revoke as needed
340 if (vp->v_flag & VCTTYISOPEN) {
341 vclrflags(vp, VCTTYISOPEN);
342 VOP_CLOSE(vp, FREAD|FWRITE);
346 vrevoke(vp, proc0.p_ucred);
354 #define FLUSHQ(q) { \
356 ndflush(q, (q)->c_cc); \
359 /* Is 'c' a line delimiter ("break" character)? */
360 #define TTBREAKC(c, lflag) \
361 ((c) == '\n' || (((c) == cc[VEOF] || \
362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
363 (c) != _POSIX_VDISABLE))
366 * Process input of a single character received on a tty.
369 ttyinput(int c, struct tty *tp)
371 tcflag_t iflag, lflag;
376 * If input is pending take it first.
379 if (ISSET(lflag, PENDIN))
384 if (ISSET(lflag, ICANON))
391 * Block further input iff:
392 * current input > threshold AND input is available to user program
393 * AND input flow control is enabled and not yet invoked.
394 * The 3 is slop for PARMRK.
397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
398 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
399 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
400 !ISSET(tp->t_state, TS_TBLOCK))
403 /* Handle exceptional conditions (break, parity, framing). */
405 err = (ISSET(c, TTY_ERRORMASK));
407 CLR(c, TTY_ERRORMASK);
408 if (ISSET(err, TTY_BI)) {
409 if (ISSET(iflag, IGNBRK))
411 if (ISSET(iflag, BRKINT)) {
412 ttyflush(tp, FREAD | FWRITE);
413 pgsignal(tp->t_pgrp, SIGINT, 1);
416 if (ISSET(iflag, PARMRK))
418 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
419 || ISSET(err, TTY_FE)) {
420 if (ISSET(iflag, IGNPAR))
422 else if (ISSET(iflag, PARMRK)) {
424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
427 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
428 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
429 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
436 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
438 if (!ISSET(lflag, EXTPROC)) {
440 * Check for literal nexting very first
442 if (ISSET(tp->t_state, TS_LNCH)) {
444 CLR(tp->t_state, TS_LNCH);
447 * Scan for special characters. This code
448 * is really just a big case statement with
449 * non-constant cases. The bottom of the
450 * case statement is labeled ``endcase'', so goto
451 * it after a case match, or similar.
455 * Control chars which aren't controlled
456 * by ICANON, ISIG, or IXON.
458 if (ISSET(lflag, IEXTEN)) {
459 if (CCEQ(cc[VLNEXT], c)) {
460 if (ISSET(lflag, ECHO)) {
461 if (ISSET(lflag, ECHOE)) {
462 (void)ttyoutput('^', tp);
463 (void)ttyoutput('\b', tp);
467 SET(tp->t_state, TS_LNCH);
470 if (CCEQ(cc[VDISCARD], c)) {
471 if (ISSET(lflag, FLUSHO))
472 CLR(tp->t_lflag, FLUSHO);
474 ttyflush(tp, FWRITE);
476 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
478 SET(tp->t_lflag, FLUSHO);
486 if (ISSET(lflag, ISIG)) {
487 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
488 if (!ISSET(lflag, NOFLSH))
489 ttyflush(tp, FREAD | FWRITE);
492 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
495 if (CCEQ(cc[VSUSP], c)) {
496 if (!ISSET(lflag, NOFLSH))
499 pgsignal(tp->t_pgrp, SIGTSTP, 1);
504 * Handle start/stop characters.
506 if (ISSET(iflag, IXON)) {
507 if (CCEQ(cc[VSTOP], c)) {
508 if (!ISSET(tp->t_state, TS_TTSTOP)) {
509 SET(tp->t_state, TS_TTSTOP);
510 (*tp->t_stop)(tp, 0);
513 if (!CCEQ(cc[VSTART], c))
516 * if VSTART == VSTOP then toggle
520 if (CCEQ(cc[VSTART], c))
524 * IGNCR, ICRNL, & INLCR
527 if (ISSET(iflag, IGNCR))
529 else if (ISSET(iflag, ICRNL))
531 } else if (c == '\n' && ISSET(iflag, INLCR))
534 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
536 * From here on down canonical mode character
537 * processing takes place.
540 * erase or erase2 (^H / ^?)
542 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
544 ttyrub(clist_unputc(&tp->t_rawq), tp);
550 if (CCEQ(cc[VKILL], c)) {
551 if (ISSET(lflag, ECHOKE) &&
552 tp->t_rawq.c_cc == tp->t_rocount &&
553 !ISSET(lflag, ECHOPRT))
554 while (tp->t_rawq.c_cc)
555 ttyrub(clist_unputc(&tp->t_rawq), tp);
558 if (ISSET(lflag, ECHOK) ||
559 ISSET(lflag, ECHOKE))
564 CLR(tp->t_state, TS_LOCAL);
570 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
581 * erase last char of word and remember the
582 * next chars type (for ALTWERASE)
585 c = clist_unputc(&tp->t_rawq);
588 if (c == ' ' || c == '\t') {
589 clist_putc(c, &tp->t_rawq);
598 c = clist_unputc(&tp->t_rawq);
601 } while (c != ' ' && c != '\t' &&
602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
603 clist_putc(c, &tp->t_rawq);
609 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
614 * ^T - kernel info and generate SIGINFO
616 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
617 if (ISSET(lflag, ISIG))
618 pgsignal(tp->t_pgrp, SIGINFO, 1);
619 if (!ISSET(lflag, NOKERNINFO))
623 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
624 if (ISSET(lflag, ISIG))
625 pgsignal(tp->t_pgrp, SIGCKPT, 1);
630 * Check for input buffer overflow
632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
634 if (ISSET(iflag, IMAXBEL)) {
635 if (tp->t_outq.c_cc < tp->t_ohiwat)
636 (void)ttyoutput(CTRL('g'), tp);
641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
649 if (clist_putc(c, &tp->t_rawq) >= 0) {
650 if (!ISSET(lflag, ICANON)) {
655 if (TTBREAKC(c, lflag)) {
657 catq(&tp->t_rawq, &tp->t_canq);
659 } else if (tp->t_rocount++ == 0)
660 tp->t_rocol = tp->t_column;
661 if (ISSET(tp->t_state, TS_ERASE)) {
663 * end of prterase \.../
665 CLR(tp->t_state, TS_ERASE);
666 (void)ttyoutput('/', tp);
670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
672 * Place the cursor over the '^' of the ^D.
674 i = imin(2, tp->t_column - i);
676 (void)ttyoutput('\b', tp);
683 * IXANY means allow any character to restart output.
685 if (ISSET(tp->t_state, TS_TTSTOP) &&
686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
689 CLR(tp->t_lflag, FLUSHO);
690 CLR(tp->t_state, TS_TTSTOP);
692 return (ttstart(tp));
696 * Output a single character on a tty, doing output processing
697 * as needed (expanding tabs, newline processing, etc.).
698 * Returns < 0 if succeeds, otherwise returns char to resend.
702 ttyoutput(int c, struct tty *tp)
708 if (!ISSET(oflag, OPOST)) {
709 if (ISSET(tp->t_lflag, FLUSHO))
711 if (clist_putc(c, &tp->t_outq))
718 * Do tab expansion if OXTABS is set. Special case if we external
719 * processing, we don't do the tab expansion because we'll probably
720 * get it wrong. If tab expansion needs to be done, let it happen
723 CLR(c, ~TTY_CHARMASK);
725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
726 c = 8 - (tp->t_column & 7);
727 if (!ISSET(tp->t_lflag, FLUSHO)) {
728 crit_enter(); /* Don't interrupt tabs. */
729 c -= b_to_q(" ", c, &tp->t_outq);
735 return (c ? -1 : '\t');
737 if (c == CEOT && ISSET(oflag, ONOEOT))
741 * Newline translation: if ONLCR is set,
742 * translate newline into "\r\n".
744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
750 /* If OCRNL is set, translate "\r" into "\n". */
751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
753 /* If ONOCR is set, don't transmit CRs when on column 0. */
754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
771 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
781 col = (col + 8) & ~7;
789 * Ioctls for all tty devices. Called after line-discipline specific ioctl
790 * has been called to do discipline-specific functions and/or reject any
791 * of these ioctl commands.
795 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
797 struct thread *td = curthread;
798 struct lwp *lp = td->td_lwp;
799 struct proc *p = td->td_proc;
804 /* If the ioctl involves modification, hang if in the background. */
828 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
838 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
839 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
841 if (p->p_pgrp->pg_jobc == 0)
843 pgsignal(p->p_pgrp, SIGTTOU, 1);
844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
852 switch (cmd) { /* Process the ioctl. */
853 case FIOASYNC: /* set/clear async i/o */
856 SET(tp->t_state, TS_ASYNC);
858 CLR(tp->t_state, TS_ASYNC);
861 case FIONREAD: /* get # bytes to read */
863 *(int *)data = ttnread(tp);
869 * Policy -- Don't allow FIOSETOWN on someone else's
872 if (tp->t_session != NULL && !isctty(p, tp))
875 error = fsetown(*(int *)data, &tp->t_sigio);
880 if (tp->t_session != NULL && !isctty(p, tp))
882 *(int *)data = fgetown(tp->t_sigio);
885 case TIOCEXCL: /* set exclusive use of tty */
887 SET(tp->t_state, TS_XCLUDE);
890 case TIOCFLUSH: { /* flush buffers */
891 int flags = *(int *)data;
894 flags = FREAD | FWRITE;
896 flags &= FREAD | FWRITE;
900 case TIOCCONS: /* become virtual console */
902 if (constty && constty != tp &&
903 ISSET(constty->t_state, TS_CONNECTED))
906 if ((error = priv_check(td, PRIV_ROOT)) != 0)
910 } else if (tp == constty)
913 case TIOCDRAIN: /* wait till output drained */
918 case TIOCGETA: { /* get termios struct */
919 struct termios *t = (struct termios *)data;
921 bcopy(&tp->t_termios, t, sizeof(struct termios));
924 case TIOCGETD: /* get line discipline */
925 *(int *)data = tp->t_line;
927 case TIOCGWINSZ: /* get window size */
928 *(struct winsize *)data = tp->t_winsize;
930 case TIOCGPGRP: /* get pgrp of tty */
933 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
935 case TIOCGSID: /* get sid of tty */
938 *(int *)data = tp->t_session->s_sid;
941 case TIOCHPCL: /* hang up on last close */
943 SET(tp->t_cflag, HUPCL);
947 case TIOCNXCL: /* reset exclusive use of tty */
949 CLR(tp->t_state, TS_XCLUDE);
952 case TIOCOUTQ: /* output queue size */
953 *(int *)data = tp->t_outq.c_cc;
955 case TIOCSETA: /* set termios struct */
956 case TIOCSETAW: /* drain output, set */
957 case TIOCSETAF: { /* drn out, fls in, set */
958 struct termios *t = (struct termios *)data;
960 if (t->c_ispeed == 0)
961 t->c_ispeed = t->c_ospeed;
962 if (t->c_ispeed == 0)
963 t->c_ispeed = tp->t_ospeed;
964 if (t->c_ispeed == 0)
967 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
973 if (cmd == TIOCSETAF)
976 if (!ISSET(t->c_cflag, CIGNORE)) {
978 * Set device hardware.
980 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
984 if (ISSET(t->c_cflag, CLOCAL) &&
985 !ISSET(tp->t_cflag, CLOCAL)) {
987 * XXX disconnections would be too hard to
988 * get rid of without this kludge. The only
989 * way to get rid of controlling terminals
990 * is to exit from the session leader.
992 CLR(tp->t_state, TS_ZOMBIE);
994 wakeup(TSA_CARR_ON(tp));
998 if ((ISSET(tp->t_state, TS_CARR_ON) ||
999 ISSET(t->c_cflag, CLOCAL)) &&
1000 !ISSET(tp->t_state, TS_ZOMBIE))
1001 SET(tp->t_state, TS_CONNECTED);
1003 CLR(tp->t_state, TS_CONNECTED);
1004 tp->t_cflag = t->c_cflag;
1005 tp->t_ispeed = t->c_ispeed;
1006 if (t->c_ospeed != 0)
1007 tp->t_ospeed = t->c_ospeed;
1010 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1012 if (ISSET(t->c_lflag, ICANON))
1013 SET(tp->t_lflag, PENDIN);
1016 * XXX we really shouldn't allow toggling
1017 * ICANON while we're in a non-termios line
1018 * discipline. Now we have to worry about
1019 * panicing for a null queue.
1021 if (tp->t_canq.c_cbreserved > 0 &&
1022 tp->t_rawq.c_cbreserved > 0) {
1023 catq(&tp->t_rawq, &tp->t_canq);
1025 * XXX the queue limits may be
1026 * different, so the old queue
1027 * swapping method no longer works.
1029 catq(&tp->t_canq, &tp->t_rawq);
1031 CLR(tp->t_lflag, PENDIN);
1035 tp->t_iflag = t->c_iflag;
1036 tp->t_oflag = t->c_oflag;
1038 * Make the EXTPROC bit read only.
1040 if (ISSET(tp->t_lflag, EXTPROC))
1041 SET(t->c_lflag, EXTPROC);
1043 CLR(t->c_lflag, EXTPROC);
1044 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1045 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1046 t->c_cc[VTIME] != tp->t_cc[VTIME])
1048 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1052 case TIOCSETD: { /* set line discipline */
1053 int t = *(int *)data;
1054 cdev_t device = tp->t_dev;
1056 if ((u_int)t >= nlinesw)
1058 if (t != tp->t_line) {
1060 (*linesw[tp->t_line].l_close)(tp, flag);
1061 error = (*linesw[t].l_open)(device, tp);
1063 (void)(*linesw[tp->t_line].l_open)(device, tp);
1072 case TIOCSTART: /* start output, like ^Q */
1074 if (ISSET(tp->t_state, TS_TTSTOP) ||
1075 ISSET(tp->t_lflag, FLUSHO)) {
1076 CLR(tp->t_lflag, FLUSHO);
1077 CLR(tp->t_state, TS_TTSTOP);
1082 case TIOCSTI: /* simulate terminal input */
1083 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
1085 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
1088 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1091 case TIOCSTOP: /* stop output, like ^S */
1093 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1094 SET(tp->t_state, TS_TTSTOP);
1095 (*tp->t_stop)(tp, 0);
1099 case TIOCSCTTY: /* become controlling tty */
1100 /* Session ctty vnode pointer set in vnode layer. */
1101 if (!SESS_LEADER(p) ||
1102 ((p->p_session->s_ttyvp || tp->t_session) &&
1103 (tp->t_session != p->p_session)))
1105 tp->t_session = p->p_session;
1106 tp->t_pgrp = p->p_pgrp;
1107 p->p_session->s_ttyp = tp;
1108 p->p_flag |= P_CONTROLT;
1110 case TIOCSPGRP: { /* set pgrp of tty */
1111 struct pgrp *pgrp = pgfind(*(int *)data);
1115 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1120 case TIOCSTAT: /* simulate control-T */
1125 case TIOCSWINSZ: /* set window size */
1126 if (bcmp((caddr_t)&tp->t_winsize, data,
1127 sizeof (struct winsize))) {
1128 tp->t_winsize = *(struct winsize *)data;
1129 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1132 case TIOCSDRAINWAIT:
1133 error = priv_check(td, PRIV_ROOT);
1136 tp->t_timeout = *(int *)data * hz;
1137 wakeup(TSA_OCOMPLETE(tp));
1138 wakeup(TSA_OLOWAT(tp));
1140 case TIOCGDRAINWAIT:
1141 *(int *)data = tp->t_timeout / hz;
1144 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1145 return (ttcompat(tp, cmd, data, flag));
1154 ttypoll(struct dev_poll_args *ap)
1156 cdev_t dev = ap->a_head.a_dev;
1157 int events = ap->a_events;
1162 /* XXX used to return ENXIO, but that means true! */
1164 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1165 POLLWRNORM)) | POLLHUP;
1170 if (events & (POLLIN | POLLRDNORM)) {
1171 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1172 revents |= events & (POLLIN | POLLRDNORM);
1174 selrecord(curthread, &tp->t_rsel);
1176 if (events & (POLLOUT | POLLWRNORM)) {
1177 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1178 ISSET(tp->t_state, TS_CONNECTED))
1179 || ISSET(tp->t_state, TS_ZOMBIE))
1180 revents |= events & (POLLOUT | POLLWRNORM);
1182 selrecord(curthread, &tp->t_wsel);
1185 ap->a_events = revents;
1189 static struct filterops ttyread_filtops =
1190 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1191 static struct filterops ttywrite_filtops =
1192 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1195 ttykqfilter(struct dev_kqfilter_args *ap)
1197 cdev_t dev = ap->a_head.a_dev;
1198 struct knote *kn = ap->a_kn;
1199 struct tty *tp = dev->si_tty;
1200 struct klist *klist;
1203 switch (kn->kn_filter) {
1205 klist = &tp->t_rsel.si_note;
1206 kn->kn_fop = &ttyread_filtops;
1209 klist = &tp->t_wsel.si_note;
1210 kn->kn_fop = &ttywrite_filtops;
1217 kn->kn_hook = (caddr_t)dev;
1220 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1227 filt_ttyrdetach(struct knote *kn)
1229 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1232 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1237 filt_ttyread(struct knote *kn, long hint)
1239 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1241 kn->kn_data = ttnread(tp);
1242 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1243 kn->kn_flags |= EV_EOF;
1246 return (kn->kn_data > 0);
1250 filt_ttywdetach(struct knote *kn)
1252 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1255 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1260 filt_ttywrite(struct knote *kn, long hint)
1262 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1264 kn->kn_data = tp->t_outq.c_cc;
1265 if (ISSET(tp->t_state, TS_ZOMBIE))
1267 return (kn->kn_data <= tp->t_olowat &&
1268 ISSET(tp->t_state, TS_CONNECTED));
1272 * Must be called while in a critical section.
1275 ttnread(struct tty *tp)
1279 if (ISSET(tp->t_lflag, PENDIN))
1281 nread = tp->t_canq.c_cc;
1282 if (!ISSET(tp->t_lflag, ICANON)) {
1283 nread += tp->t_rawq.c_cc;
1284 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1291 * Wait for output to drain.
1294 ttywait(struct tty *tp)
1300 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1301 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1303 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1304 ISSET(tp->t_state, TS_CONNECTED)) {
1305 SET(tp->t_state, TS_SO_OCOMPLETE);
1306 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1310 if (error == EWOULDBLOCK)
1317 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1324 * Flush if successfully wait.
1327 ttywflush(struct tty *tp)
1331 if ((error = ttywait(tp)) == 0)
1332 ttyflush(tp, FREAD);
1337 * Flush tty read and/or write queues, notifying anyone waiting.
1340 ttyflush(struct tty *tp, int rw)
1347 FLUSHQ(&tp->t_outq);
1348 CLR(tp->t_state, TS_TTSTOP);
1350 (*tp->t_stop)(tp, rw);
1352 FLUSHQ(&tp->t_canq);
1353 FLUSHQ(&tp->t_rawq);
1354 CLR(tp->t_lflag, PENDIN);
1357 CLR(tp->t_state, TS_LOCAL);
1359 if (ISSET(tp->t_state, TS_TBLOCK)) {
1361 FLUSHQ(&tp->t_outq);
1365 * Don't let leave any state that might clobber the
1366 * next line discipline (although we should do more
1367 * to send the START char). Not clearing the state
1368 * may have caused the "putc to a clist with no
1369 * reserved cblocks" panic/kprintf.
1371 CLR(tp->t_state, TS_TBLOCK);
1373 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1374 if (ISSET(tp->t_iflag, IXOFF)) {
1376 * XXX wait a bit in the hope that the stop
1377 * character (if any) will go out. Waiting
1378 * isn't good since it allows races. This
1379 * will be fixed when the stop character is
1380 * put in a special queue. Don't bother with
1381 * the checks in ttywait() since the timeout
1384 SET(tp->t_state, TS_SO_OCOMPLETE);
1385 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1388 * Don't try sending the stop character again.
1390 CLR(tp->t_state, TS_TBLOCK);
1397 FLUSHQ(&tp->t_outq);
1404 * Copy in the default termios characters.
1407 termioschars(struct termios *t)
1410 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1417 ttychars(struct tty *tp)
1420 termioschars(&tp->t_termios);
1424 * Handle input high water. Send stop character for the IXOFF case. Turn
1425 * on our input flow control bit and propagate the changes to the driver.
1426 * XXX the stop character should be put in a special high priority queue.
1429 ttyblock(struct tty *tp)
1432 SET(tp->t_state, TS_TBLOCK);
1433 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1434 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1435 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1440 * Handle input low water. Send start character for the IXOFF case. Turn
1441 * off our input flow control bit and propagate the changes to the driver.
1442 * XXX the start character should be put in a special high priority queue.
1445 ttyunblock(struct tty *tp)
1448 CLR(tp->t_state, TS_TBLOCK);
1449 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1450 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1451 SET(tp->t_state, TS_TBLOCK); /* try again later */
1456 /* Not used by any current (i386) drivers. */
1458 * Restart after an inter-char delay.
1461 ttrstrt(void *tp_arg)
1465 KASSERT(tp_arg != NULL, ("ttrstrt"));
1469 CLR(tp->t_state, TS_TIMEOUT);
1476 ttstart(struct tty *tp)
1479 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1485 * "close" a line discipline
1488 ttylclose(struct tty *tp, int flag)
1491 if (flag & FNONBLOCK || ttywflush(tp))
1492 ttyflush(tp, FREAD | FWRITE);
1497 * Handle modem control transition on a tty.
1498 * Flag indicates new state of carrier.
1499 * Returns 0 if the line should be turned off, otherwise 1.
1502 ttymodem(struct tty *tp, int flag)
1505 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1507 * MDMBUF: do flow control according to carrier flag
1508 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1509 * works if IXON and IXANY are clear.
1512 CLR(tp->t_state, TS_CAR_OFLOW);
1513 CLR(tp->t_state, TS_TTSTOP);
1515 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1516 SET(tp->t_state, TS_CAR_OFLOW);
1517 SET(tp->t_state, TS_TTSTOP);
1518 (*tp->t_stop)(tp, 0);
1520 } else if (flag == 0) {
1524 CLR(tp->t_state, TS_CARR_ON);
1525 if (ISSET(tp->t_state, TS_ISOPEN) &&
1526 !ISSET(tp->t_cflag, CLOCAL)) {
1527 SET(tp->t_state, TS_ZOMBIE);
1528 CLR(tp->t_state, TS_CONNECTED);
1529 if (tp->t_session && tp->t_session->s_leader)
1530 ksignal(tp->t_session->s_leader, SIGHUP);
1531 ttyflush(tp, FREAD | FWRITE);
1538 SET(tp->t_state, TS_CARR_ON);
1539 if (!ISSET(tp->t_state, TS_ZOMBIE))
1540 SET(tp->t_state, TS_CONNECTED);
1541 wakeup(TSA_CARR_ON(tp));
1549 * Reinput pending characters after state switch
1550 * call from a critical section.
1553 ttypend(struct tty *tp)
1558 CLR(tp->t_lflag, PENDIN);
1559 SET(tp->t_state, TS_TYPEN);
1561 * XXX this assumes too much about clist internals. It may even
1562 * fail if the cblock slush pool is empty. We can't allocate more
1563 * cblocks here because we are called from an interrupt handler
1564 * and clist_alloc_cblocks() can wait.
1567 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1568 tp->t_rawq.c_cbmax = tq.c_cbmax;
1569 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1570 while ((c = clist_getc(&tq)) >= 0)
1572 CLR(tp->t_state, TS_TYPEN);
1576 * Process a read call on a tty device.
1579 ttread(struct tty *tp, struct uio *uio, int flag)
1584 cc_t *cc = tp->t_cc;
1587 int first, error = 0;
1588 int has_stime = 0, last_cc = 0;
1589 long slp = 0; /* XXX this should be renamed `timo'. */
1590 struct timeval stime;
1592 lp = curthread->td_lwp;
1596 lflag = tp->t_lflag;
1598 * take pending input first
1600 if (ISSET(lflag, PENDIN)) {
1602 splz(); /* reduce latency */
1603 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1607 * Hang process if it's in the background.
1609 if ((pp = curproc) && isbackground(pp, tp)) {
1611 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1612 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1613 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1615 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1616 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1622 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1624 return (0); /* EOF */
1628 * If canonical, use the canonical queue,
1629 * else use the raw queue.
1631 * (should get rid of clists...)
1633 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1635 if (flag & IO_NDELAY) {
1638 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1643 return (EWOULDBLOCK);
1645 if (!ISSET(lflag, ICANON)) {
1648 struct timeval timecopy;
1651 * Check each of the four combinations.
1652 * (m > 0 && t == 0) is the normal read case.
1653 * It should be fairly efficient, so we check that and its
1654 * companion case (m == 0 && t == 0) first.
1655 * For the other two cases, we compute the target sleep time
1664 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1668 t *= 100000; /* time in us */
1669 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1670 ((t1).tv_usec - (t2).tv_usec))
1676 getmicrotime(&timecopy);
1678 /* first character, start timer */
1682 } else if (qp->c_cc > last_cc) {
1683 /* got a character, restart timer */
1687 /* nothing, check expiration */
1688 slp = t - diff(timecopy, stime);
1693 } else { /* m == 0 */
1696 getmicrotime(&timecopy);
1702 slp = t - diff(timecopy, stime);
1704 /* Timed out, but 0 is enough input. */
1712 * Rounding down may make us wake up just short
1713 * of the target, so we round up.
1714 * The formula is ceiling(slp * hz/1000000).
1715 * 32-bit arithmetic is enough for hz < 169.
1716 * XXX see tvtohz() for how to avoid overflow if hz
1717 * is large (divide by `tick' and/or arrange to
1718 * use tvtohz() if hz is large).
1720 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1723 if (qp->c_cc <= 0) {
1726 * There is no input, or not enough input and we can block.
1728 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1729 ISSET(tp->t_state, TS_CONNECTED) ?
1730 "ttyin" : "ttyhup", (int)slp);
1732 if (error == EWOULDBLOCK)
1737 * XXX what happens if another process eats some input
1738 * while we are asleep (not just here)? It would be
1739 * safest to detect changes and reset our state variables
1740 * (has_stime and last_cc).
1748 * Input present, check for input mapping and processing.
1751 if (ISSET(lflag, ICANON | ISIG))
1757 icc = imin(uio->uio_resid, IBUFSIZ);
1758 icc = q_to_b(qp, ibuf, icc);
1764 error = uiomove(ibuf, icc, uio);
1766 * XXX if there was an error then we should ungetc() the
1767 * unmoved chars and reduce icc here.
1771 if (uio->uio_resid == 0)
1785 * delayed suspend (^Y)
1787 if (CCEQ(cc[VDSUSP], c) &&
1788 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1789 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1791 error = ttysleep(tp, &lbolt, PCATCH,
1800 * Interpret EOF only in canonical mode.
1802 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1805 * Give user character.
1807 error = ureadc(c, uio);
1809 /* XXX should ungetc(c, qp). */
1811 if (uio->uio_resid == 0)
1814 * In canonical mode check for a "break character"
1815 * marking the end of a "line of input".
1817 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1824 * Look to unblock input now that (presumably)
1825 * the input queue has gone down.
1828 if (ISSET(tp->t_state, TS_TBLOCK) &&
1829 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1837 * Check the output queue on tp for space for a kernel message (from uprintf
1838 * or tprintf). Allow some space over the normal hiwater mark so we don't
1839 * lose messages due to normal flow control, but don't let the tty run amok.
1840 * Sleeps here are not interruptible, but we return prematurely if new signals
1844 ttycheckoutq(struct tty *tp, int wait)
1846 struct lwp *lp = curthread->td_lwp;
1848 sigset_t oldset, newset;
1850 hiwat = tp->t_ohiwat;
1851 SIGEMPTYSET(oldset);
1852 SIGEMPTYSET(newset);
1855 oldset = lwp_sigpend(lp);
1856 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1857 while (tp->t_outq.c_cc > hiwat) {
1859 if (tp->t_outq.c_cc <= hiwat)
1862 newset = lwp_sigpend(lp);
1863 if (!wait || SIGSETNEQ(oldset, newset)) {
1867 SET(tp->t_state, TS_SO_OLOWAT);
1868 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1876 * Process a write call on a tty device.
1879 ttwrite(struct tty *tp, struct uio *uio, int flag)
1885 int i, hiwat, cnt, error;
1888 lp = curthread->td_lwp;
1889 hiwat = tp->t_ohiwat;
1890 cnt = uio->uio_resid;
1895 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1897 if (uio->uio_resid == cnt)
1901 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1902 if (flag & IO_NDELAY) {
1904 error = EWOULDBLOCK;
1907 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1916 * Hang the process if it's in the background.
1918 if ((pp = curproc) && isbackground(pp, tp) &&
1919 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1920 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1921 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1922 if (pp->p_pgrp->pg_jobc == 0) {
1926 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1927 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1933 * Process the user's data in at most OBUFSIZ chunks. Perform any
1934 * output translation. Keep track of high water mark, sleep on
1935 * overflow awaiting device aid in acquiring new space.
1937 while (uio->uio_resid > 0 || cc > 0) {
1938 if (ISSET(tp->t_lflag, FLUSHO)) {
1942 if (tp->t_outq.c_cc > hiwat)
1945 * Grab a hunk of data from the user, unless we have some
1946 * leftover from last time.
1949 cc = imin(uio->uio_resid, OBUFSIZ);
1951 error = uiomove(cp, cc, uio);
1958 * If nothing fancy need be done, grab those characters we
1959 * can handle without any of ttyoutput's processing and
1960 * just transfer them to the output q. For those chars
1961 * which require special processing (as indicated by the
1962 * bits in char_type), call ttyoutput. After processing
1963 * a hunk of data, look for FLUSHO so ^O's will take effect
1967 if (!ISSET(tp->t_oflag, OPOST))
1970 ce = cc - scanc((u_int)cc, (u_char *)cp,
1971 char_type, CCLASSMASK);
1973 * If ce is zero, then we're processing
1974 * a special character through ttyoutput.
1978 if (ttyoutput(*cp, tp) >= 0) {
1979 /* No Clists, wait a bit. */
1981 if (flag & IO_NDELAY) {
1982 error = EWOULDBLOCK;
1985 error = ttysleep(tp, &lbolt,
1994 if (ISSET(tp->t_lflag, FLUSHO) ||
1995 tp->t_outq.c_cc > hiwat)
2001 * A bunch of normal characters have been found.
2002 * Transfer them en masse to the output queue and
2003 * continue processing at the top of the loop.
2004 * If there are any further characters in this
2005 * <= OBUFSIZ chunk, the first should be a character
2006 * requiring special handling by ttyoutput.
2009 i = b_to_q(cp, ce, &tp->t_outq);
2012 cp += ce, cc -= ce, tk_nout += ce;
2015 /* No Clists, wait a bit. */
2017 if (flag & IO_NDELAY) {
2018 error = EWOULDBLOCK;
2021 error = ttysleep(tp, &lbolt, PCATCH,
2027 if (ISSET(tp->t_lflag, FLUSHO) ||
2028 tp->t_outq.c_cc > hiwat)
2035 * If cc is nonzero, we leave the uio structure inconsistent, as the
2036 * offset and iov pointers have moved forward, but it doesn't matter
2037 * (the call will either return short or restart with a new uio).
2039 uio->uio_resid += cc;
2046 * This can only occur if FLUSHO is set in t_lflag,
2047 * or if ttstart/oproc is synchronous (or very fast).
2049 if (tp->t_outq.c_cc <= hiwat) {
2053 if (flag & IO_NDELAY) {
2055 uio->uio_resid += cc;
2056 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2058 SET(tp->t_state, TS_SO_OLOWAT);
2059 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2061 if (error == EWOULDBLOCK)
2069 * Rubout one character from the rawq of tp
2070 * as cleanly as possible.
2073 ttyrub(int c, struct tty *tp)
2079 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2081 CLR(tp->t_lflag, FLUSHO);
2082 if (ISSET(tp->t_lflag, ECHOE)) {
2083 if (tp->t_rocount == 0) {
2085 * Screwed by ttwrite; retype
2090 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2093 CLR(c, ~TTY_CHARMASK);
2094 switch (CCLASS(c)) {
2103 if (ISSET(tp->t_lflag, ECHOCTL))
2107 if (tp->t_rocount < tp->t_rawq.c_cc) {
2112 savecol = tp->t_column;
2113 SET(tp->t_state, TS_CNTTB);
2114 SET(tp->t_lflag, FLUSHO);
2115 tp->t_column = tp->t_rocol;
2116 cp = tp->t_rawq.c_cf;
2118 tabc = *cp; /* XXX FIX NEXTC */
2119 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2121 CLR(tp->t_lflag, FLUSHO);
2122 CLR(tp->t_state, TS_CNTTB);
2125 /* savecol will now be length of the tab. */
2126 savecol -= tp->t_column;
2127 tp->t_column += savecol;
2129 savecol = 8; /* overflow screw */
2130 while (--savecol >= 0)
2131 (void)ttyoutput('\b', tp);
2134 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2135 (void)kprintf(PANICSTR, c, CCLASS(c));
2137 panic(PANICSTR, c, CCLASS(c));
2141 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2142 if (!ISSET(tp->t_state, TS_ERASE)) {
2143 SET(tp->t_state, TS_ERASE);
2144 (void)ttyoutput('\\', tp);
2148 ttyecho(tp->t_cc[VERASE], tp);
2150 * This code may be executed not only when an ERASE key
2151 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2152 * So, I didn't think it was worthwhile to pass the extra
2153 * information (which would need an extra parameter,
2154 * changing every call) needed to distinguish the ERASE2
2155 * case from the ERASE.
2162 * Back over cnt characters, erasing them.
2165 ttyrubo(struct tty *tp, int cnt)
2169 (void)ttyoutput('\b', tp);
2170 (void)ttyoutput(' ', tp);
2171 (void)ttyoutput('\b', tp);
2177 * Reprint the rawq line. Note, it is assumed that c_cc has already
2181 ttyretype(struct tty *tp)
2186 /* Echo the reprint character. */
2187 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2188 ttyecho(tp->t_cc[VREPRINT], tp);
2190 (void)ttyoutput('\n', tp);
2194 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2195 * BIT OF FIRST CHAR.
2198 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2199 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2201 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2202 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2204 CLR(tp->t_state, TS_ERASE);
2207 tp->t_rocount = tp->t_rawq.c_cc;
2212 * Echo a typed character to the terminal.
2215 ttyecho(int c, struct tty *tp)
2218 if (!ISSET(tp->t_state, TS_CNTTB))
2219 CLR(tp->t_lflag, FLUSHO);
2220 if ((!ISSET(tp->t_lflag, ECHO) &&
2221 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2222 ISSET(tp->t_lflag, EXTPROC))
2224 if (ISSET(tp->t_lflag, ECHOCTL) &&
2225 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2226 ISSET(c, TTY_CHARMASK) == 0177)) {
2227 (void)ttyoutput('^', tp);
2228 CLR(c, ~TTY_CHARMASK);
2234 (void)ttyoutput(c, tp);
2238 * Wake up any readers on a tty.
2241 ttwakeup(struct tty *tp)
2244 if (tp->t_rsel.si_pid != 0)
2245 selwakeup(&tp->t_rsel);
2246 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2247 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2248 wakeup(TSA_HUP_OR_INPUT(tp));
2249 KNOTE(&tp->t_rsel.si_note, 0);
2253 * Wake up any writers on a tty.
2256 ttwwakeup(struct tty *tp)
2259 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2260 selwakeup(&tp->t_wsel);
2261 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2262 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2263 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2264 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2265 CLR(tp->t_state, TS_SO_OCOMPLETE);
2266 wakeup(TSA_OCOMPLETE(tp));
2268 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2269 tp->t_outq.c_cc <= tp->t_olowat) {
2270 CLR(tp->t_state, TS_SO_OLOWAT);
2271 wakeup(TSA_OLOWAT(tp));
2273 KNOTE(&tp->t_wsel.si_note, 0);
2277 * Look up a code for a specified speed in a conversion table;
2278 * used by drivers to map software speed values to hardware parameters.
2281 ttspeedtab(int speed, struct speedtab *table)
2284 for ( ; table->sp_speed != -1; table++)
2285 if (table->sp_speed == speed)
2286 return (table->sp_code);
2291 * Set input and output watermarks and buffer sizes. For input, the
2292 * high watermark is about one second's worth of input above empty, the
2293 * low watermark is slightly below high water, and the buffer size is a
2294 * driver-dependent amount above high water. For output, the watermarks
2295 * are near the ends of the buffer, with about 1 second's worth of input
2296 * between them. All this only applies to the standard line discipline.
2299 ttsetwater(struct tty *tp)
2301 int cps, ttmaxhiwat, x;
2304 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2305 switch (tp->t_ispeedwat) {
2307 cps = tp->t_ispeed / 10;
2311 * This case is for old drivers that don't know about
2312 * t_ispeedwat. Arrange for them to get the old buffer
2313 * sizes and watermarks.
2315 cps = TTYHOG - 2 * 256;
2316 tp->t_ififosize = 2 * 2048;
2319 cps = tp->t_ispeedwat / 10;
2323 tp->t_ilowat = 7 * cps / 8;
2324 x = cps + tp->t_ififosize;
2325 clist_alloc_cblocks(&tp->t_rawq, x, x);
2328 switch (tp->t_ospeedwat) {
2330 cps = tp->t_ospeed / 10;
2331 ttmaxhiwat = 2 * TTMAXHIWAT;
2334 cps = tp->t_ospeed / 10;
2335 ttmaxhiwat = TTMAXHIWAT;
2338 cps = tp->t_ospeedwat / 10;
2339 ttmaxhiwat = 8 * TTMAXHIWAT;
2342 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2343 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2345 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2346 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2347 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2349 clist_alloc_cblocks(&tp->t_outq, x, x);
2354 * Report on state of foreground process group.
2357 ttyinfo(struct tty *tp)
2359 struct proc *p, *pick;
2364 if (ttycheckoutq(tp,0) == 0)
2368 * We always print the load average, then figure out what else to
2369 * print based on the state of the current process group.
2371 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2372 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2374 if (tp->t_session == NULL) {
2375 ttyprintf(tp, "not a controlling terminal\n");
2376 } else if (tp->t_pgrp == NULL) {
2377 ttyprintf(tp, "no foreground process group\n");
2378 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2379 ttyprintf(tp, "empty foreground process group\n");
2382 * Pick an interesting process. Note that certain elements,
2383 * in particular the wmesg, require a critical section for
2384 * safe access (YYY and we are still not MP safe).
2386 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2395 /* XXX lwp should compare lwps */
2397 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2398 if (proc_compare(pick, p))
2403 lp = FIRST_LWP_IN_PROC(pick);
2405 ttyprintf(tp, "foreground process without lwp\n");
2412 * Figure out what wait/process-state message, and command
2416 * XXX lwp This is a horrible mixture. We need to rework this
2417 * as soon as lwps have their own runnable status.
2419 if (pick->p_flag & P_WEXIT)
2421 else if (lp->lwp_stat == LSRUN)
2423 else if (pick->p_stat == SIDL)
2425 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2426 str = lp->lwp_wmesg;
2430 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2431 pick->p_comm, pick->p_pid, str);
2434 * Calculate cpu usage, percent cpu, and cmsz. Note that
2435 * 'pick' becomes invalid the moment we exit the critical
2438 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2439 calcru_proc(pick, &ru);
2441 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2443 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2446 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2453 ttyprintf(tp, " %s ", buf);
2454 ttyprintf(tp, "%ld.%02ldu ",
2455 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2456 ttyprintf(tp, "%ld.%02lds ",
2457 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2458 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2460 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2464 * Returns 1 if p2 is "better" than p1
2466 * The algorithm for picking the "interesting" process is thus:
2468 * 1) Only foreground processes are eligible - implied.
2469 * 2) Runnable processes are favored over anything else. The runner
2470 * with the highest cpu utilization is picked (p_cpticks). Ties are
2471 * broken by picking the highest pid.
2472 * 3) The sleeper with the shortest sleep time is next. With ties,
2473 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2474 * 4) Further ties are broken by picking the highest pid.
2476 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2477 #define TESTAB(a, b) ((a)<<1 | (b))
2483 proc_compare(struct proc *p1, struct proc *p2)
2485 struct lwp *lp1, *lp2;
2492 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2498 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2502 lp1 = FIRST_LWP_IN_PROC(p1);
2503 lp2 = FIRST_LWP_IN_PROC(p2);
2506 * see if at least one of them is runnable
2508 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2515 * tie - favor one with highest recent cpu utilization
2517 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2519 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2521 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2524 * pick the one with the smallest sleep time
2526 if (lp2->lwp_slptime > lp1->lwp_slptime)
2528 if (lp1->lwp_slptime > lp2->lwp_slptime)
2531 * favor one sleeping in a non-interruptible sleep
2533 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2535 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2537 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2541 * Output char to tty; console putchar style.
2544 tputchar(int c, struct tty *tp)
2547 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2552 (void)ttyoutput('\r', tp);
2553 (void)ttyoutput(c, tp);
2560 * Sleep on chan, returning ERESTART if tty changed while we napped and
2561 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2562 * the tty is revoked, restarting a pending call will redo validation done
2563 * at the start of the call.
2566 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2572 error = tsleep(chan, slpflags, wmesg, timo);
2575 return (tp->t_gen == gen ? 0 : ERESTART);
2579 * Allocate a tty struct. Clists in the struct will be allocated by
2583 ttymalloc(struct tty *tp)
2588 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2595 * Free a tty struct. Clists in the struct should have been freed by
2598 * XXX not yet usable: since we support a half-closed state and do not
2599 * ref count the tty reference from the session, it is possible for a
2600 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2603 ttyfree(struct tty *tp)
2610 ttyregister(struct tty *tp)
2612 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2616 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2620 SLIST_FOREACH(tp, &tty_list, t_list) {
2623 t.t_dev = (cdev_t)dev2udev(t.t_dev);
2624 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2631 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2632 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2635 nottystop(struct tty *tp, int rw)
2642 ttyread(struct dev_read_args *ap)
2646 tp = ap->a_head.a_dev->si_tty;
2649 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2653 ttywrite(struct dev_write_args *ap)
2657 tp = ap->a_head.a_dev->si_tty;
2660 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));