2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
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22 * 4. Neither the name of the University nor the names of its contributors
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34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.24 2006/06/13 08:12:03 dillon Exp $
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
51 * o Do the new sio locking stuff here and use it to avoid special
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
62 * o Now that historical speed conversions are handled here, don't
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
83 #include <sys/clist.h>
85 #include <sys/fcntl.h>
87 #include <sys/dkstat.h>
89 #include <sys/kernel.h>
90 #include <sys/vnode.h>
91 #include <sys/signalvar.h>
92 #include <sys/resourcevar.h>
93 #include <sys/malloc.h>
94 #include <sys/filedesc.h>
95 #include <sys/sysctl.h>
96 #include <sys/thread2.h>
101 #include <vm/vm_map.h>
103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105 static int proc_compare (struct proc *p1, struct proc *p2);
106 static int ttnread (struct tty *tp);
107 static void ttyecho (int c, struct tty *tp);
108 static int ttyoutput (int c, struct tty *tp);
109 static void ttypend (struct tty *tp);
110 static void ttyretype (struct tty *tp);
111 static void ttyrub (int c, struct tty *tp);
112 static void ttyrubo (struct tty *tp, int cnt);
113 static void ttyunblock (struct tty *tp);
114 static int ttywflush (struct tty *tp);
115 static int filt_ttyread (struct knote *kn, long hint);
116 static void filt_ttyrdetach (struct knote *kn);
117 static int filt_ttywrite (struct knote *kn, long hint);
118 static void filt_ttywdetach (struct knote *kn);
121 * Table with character classes and parity. The 8th bit indicates parity,
122 * the 7th bit indicates the character is an alphameric or underscore (for
123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
124 * are 0 then the character needs no special processing on output; classes
125 * other than 0 might be translated or (not currently) require delays.
127 #define E 0x00 /* Even parity. */
128 #define O 0x80 /* Odd parity. */
129 #define PARITY(c) (char_type[c] & O)
131 #define ALPHA 0x40 /* Alpha or underscore. */
132 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
134 #define CCLASSMASK 0x3f
135 #define CCLASS(c) (char_type[c] & CCLASSMASK)
140 #define NA ORDINARY | ALPHA
146 static u_char const char_type[] = {
147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
164 * Meta chars; should be settable per character set;
165 * for now, treat them all as normal characters.
167 NA, NA, NA, NA, NA, NA, NA, NA,
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
193 /* Macros to clear/set/test flags. */
194 #define SET(t, f) (t) |= (f)
195 #define CLR(t, f) (t) &= ~(f)
196 #define ISSET(t, f) ((t) & (f))
198 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
199 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
202 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
203 "LU", "TTY input statistic");
205 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
206 "LU", "TTY output statistic");
210 * list of struct tty where pstat(8) can pick it up with sysctl
212 static SLIST_HEAD(, tty) tty_list;
215 * Initial open of tty, or (re)entry to standard tty line discipline.
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
248 funsetown(tp->t_sigio);
253 ttyflush(tp, FREAD | FWRITE);
254 clist_free_cblocks(&tp->t_canq);
255 clist_free_cblocks(&tp->t_outq);
256 clist_free_cblocks(&tp->t_rawq);
259 tp->t_line = TTYDISC;
267 * Disassociate the tty from its session. Traditionally this has only been
268 * a half-close, meaning that the session was still allowed to point at the
269 * tty (resulting in the tty in the ps command showing something like 'p0-'),
270 * even though the tty is no longer pointing at the session.
272 * The half close seems to be useful only for 'ps' output but there is as
273 * yet no reason to remove the feature. The full-close code is currently
274 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
277 ttyclearsession(struct tty *tp)
282 if ((sp = tp->t_session) != NULL) {
283 tp->t_session = NULL;
284 #ifdef TTY_DO_FULL_CLOSE
285 /* FULL CLOSE (not yet) */
286 if (sp->s_ttyp == tp) {
289 printf("ttyclearsession: warning: sp->s_ttyp != tp "
290 "%p/%p\n", sp->s_ttyp, tp);
297 * Terminate the tty vnode association for a session. This is the
298 * 'other half' of the close. Because multiple opens of /dev/tty
299 * only generate a single open to the actual tty, the file modes
300 * are locked to FREAD|FWRITE.
303 ttyclosesession(struct session *sp, int dorele)
307 if ((vp = sp->s_ttyvp) == NULL)
310 if (vp->v_flag & VCTTYISOPEN) {
311 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY) == 0) {
312 vclrflags(vp, VCTTYISOPEN);
313 VOP_CLOSE(vp, FREAD|FWRITE);
322 #define FLUSHQ(q) { \
324 ndflush(q, (q)->c_cc); \
327 /* Is 'c' a line delimiter ("break" character)? */
328 #define TTBREAKC(c, lflag) \
329 ((c) == '\n' || (((c) == cc[VEOF] || \
330 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
331 (c) != _POSIX_VDISABLE))
334 * Process input of a single character received on a tty.
341 tcflag_t iflag, lflag;
346 * If input is pending take it first.
349 if (ISSET(lflag, PENDIN))
354 if (ISSET(lflag, ICANON))
361 * Block further input iff:
362 * current input > threshold AND input is available to user program
363 * AND input flow control is enabled and not yet invoked.
364 * The 3 is slop for PARMRK.
367 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
368 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
369 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
370 !ISSET(tp->t_state, TS_TBLOCK))
373 /* Handle exceptional conditions (break, parity, framing). */
375 err = (ISSET(c, TTY_ERRORMASK));
377 CLR(c, TTY_ERRORMASK);
378 if (ISSET(err, TTY_BI)) {
379 if (ISSET(iflag, IGNBRK))
381 if (ISSET(iflag, BRKINT)) {
382 ttyflush(tp, FREAD | FWRITE);
383 pgsignal(tp->t_pgrp, SIGINT, 1);
386 if (ISSET(iflag, PARMRK))
388 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
389 || ISSET(err, TTY_FE)) {
390 if (ISSET(iflag, IGNPAR))
392 else if (ISSET(iflag, PARMRK)) {
394 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
397 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
398 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
399 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
406 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
408 if (!ISSET(lflag, EXTPROC)) {
410 * Check for literal nexting very first
412 if (ISSET(tp->t_state, TS_LNCH)) {
414 CLR(tp->t_state, TS_LNCH);
417 * Scan for special characters. This code
418 * is really just a big case statement with
419 * non-constant cases. The bottom of the
420 * case statement is labeled ``endcase'', so goto
421 * it after a case match, or similar.
425 * Control chars which aren't controlled
426 * by ICANON, ISIG, or IXON.
428 if (ISSET(lflag, IEXTEN)) {
429 if (CCEQ(cc[VLNEXT], c)) {
430 if (ISSET(lflag, ECHO)) {
431 if (ISSET(lflag, ECHOE)) {
432 (void)ttyoutput('^', tp);
433 (void)ttyoutput('\b', tp);
437 SET(tp->t_state, TS_LNCH);
440 if (CCEQ(cc[VDISCARD], c)) {
441 if (ISSET(lflag, FLUSHO))
442 CLR(tp->t_lflag, FLUSHO);
444 ttyflush(tp, FWRITE);
446 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
448 SET(tp->t_lflag, FLUSHO);
456 if (ISSET(lflag, ISIG)) {
457 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
458 if (!ISSET(lflag, NOFLSH))
459 ttyflush(tp, FREAD | FWRITE);
462 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
465 if (CCEQ(cc[VSUSP], c)) {
466 if (!ISSET(lflag, NOFLSH))
469 pgsignal(tp->t_pgrp, SIGTSTP, 1);
474 * Handle start/stop characters.
476 if (ISSET(iflag, IXON)) {
477 if (CCEQ(cc[VSTOP], c)) {
478 if (!ISSET(tp->t_state, TS_TTSTOP)) {
479 SET(tp->t_state, TS_TTSTOP);
480 (*tp->t_stop)(tp, 0);
483 if (!CCEQ(cc[VSTART], c))
486 * if VSTART == VSTOP then toggle
490 if (CCEQ(cc[VSTART], c))
494 * IGNCR, ICRNL, & INLCR
497 if (ISSET(iflag, IGNCR))
499 else if (ISSET(iflag, ICRNL))
501 } else if (c == '\n' && ISSET(iflag, INLCR))
504 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
506 * From here on down canonical mode character
507 * processing takes place.
510 * erase or erase2 (^H / ^?)
512 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
514 ttyrub(unputc(&tp->t_rawq), tp);
520 if (CCEQ(cc[VKILL], c)) {
521 if (ISSET(lflag, ECHOKE) &&
522 tp->t_rawq.c_cc == tp->t_rocount &&
523 !ISSET(lflag, ECHOPRT))
524 while (tp->t_rawq.c_cc)
525 ttyrub(unputc(&tp->t_rawq), tp);
528 if (ISSET(lflag, ECHOK) ||
529 ISSET(lflag, ECHOKE))
534 CLR(tp->t_state, TS_LOCAL);
540 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
546 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
551 * erase last char of word and remember the
552 * next chars type (for ALTWERASE)
555 c = unputc(&tp->t_rawq);
558 if (c == ' ' || c == '\t') {
559 (void)putc(c, &tp->t_rawq);
568 c = unputc(&tp->t_rawq);
571 } while (c != ' ' && c != '\t' &&
572 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
573 (void)putc(c, &tp->t_rawq);
579 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
584 * ^T - kernel info and generate SIGINFO
586 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
587 if (ISSET(lflag, ISIG))
588 pgsignal(tp->t_pgrp, SIGINFO, 1);
589 if (!ISSET(lflag, NOKERNINFO))
593 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
594 if (ISSET(lflag, ISIG))
595 pgsignal(tp->t_pgrp, SIGCKPT, 1);
600 * Check for input buffer overflow
602 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
604 if (ISSET(iflag, IMAXBEL)) {
605 if (tp->t_outq.c_cc < tp->t_ohiwat)
606 (void)ttyoutput(CTRL('g'), tp);
611 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
612 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
613 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
616 * Put data char in q for user and
617 * wakeup on seeing a line delimiter.
619 if (putc(c, &tp->t_rawq) >= 0) {
620 if (!ISSET(lflag, ICANON)) {
625 if (TTBREAKC(c, lflag)) {
627 catq(&tp->t_rawq, &tp->t_canq);
629 } else if (tp->t_rocount++ == 0)
630 tp->t_rocol = tp->t_column;
631 if (ISSET(tp->t_state, TS_ERASE)) {
633 * end of prterase \.../
635 CLR(tp->t_state, TS_ERASE);
636 (void)ttyoutput('/', tp);
640 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
642 * Place the cursor over the '^' of the ^D.
644 i = imin(2, tp->t_column - i);
646 (void)ttyoutput('\b', tp);
653 * IXANY means allow any character to restart output.
655 if (ISSET(tp->t_state, TS_TTSTOP) &&
656 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
659 CLR(tp->t_lflag, FLUSHO);
660 CLR(tp->t_state, TS_TTSTOP);
662 return (ttstart(tp));
666 * Output a single character on a tty, doing output processing
667 * as needed (expanding tabs, newline processing, etc.).
668 * Returns < 0 if succeeds, otherwise returns char to resend.
680 if (!ISSET(oflag, OPOST)) {
681 if (ISSET(tp->t_lflag, FLUSHO))
683 if (putc(c, &tp->t_outq))
690 * Do tab expansion if OXTABS is set. Special case if we external
691 * processing, we don't do the tab expansion because we'll probably
692 * get it wrong. If tab expansion needs to be done, let it happen
695 CLR(c, ~TTY_CHARMASK);
697 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
698 c = 8 - (tp->t_column & 7);
699 if (!ISSET(tp->t_lflag, FLUSHO)) {
700 crit_enter(); /* Don't interrupt tabs. */
701 c -= b_to_q(" ", c, &tp->t_outq);
707 return (c ? -1 : '\t');
709 if (c == CEOT && ISSET(oflag, ONOEOT))
713 * Newline translation: if ONLCR is set,
714 * translate newline into "\r\n".
716 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
719 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
722 /* If OCRNL is set, translate "\r" into "\n". */
723 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
725 /* If ONOCR is set, don't transmit CRs when on column 0. */
726 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
731 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
743 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
753 col = (col + 8) & ~7;
761 * Ioctls for all tty devices. Called after line-discipline specific ioctl
762 * has been called to do discipline-specific functions and/or reject any
763 * of these ioctl commands.
767 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
769 struct thread *td = curthread;
770 struct proc *p = td->td_proc;
775 /* If the ioctl involves modification, hang if in the background. */
799 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
809 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
810 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
811 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
812 if (p->p_pgrp->pg_jobc == 0)
814 pgsignal(p->p_pgrp, SIGTTOU, 1);
815 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
823 switch (cmd) { /* Process the ioctl. */
824 case FIOASYNC: /* set/clear async i/o */
827 SET(tp->t_state, TS_ASYNC);
829 CLR(tp->t_state, TS_ASYNC);
832 case FIONREAD: /* get # bytes to read */
834 *(int *)data = ttnread(tp);
840 * Policy -- Don't allow FIOSETOWN on someone else's
843 if (tp->t_session != NULL && !isctty(p, tp))
846 error = fsetown(*(int *)data, &tp->t_sigio);
851 if (tp->t_session != NULL && !isctty(p, tp))
853 *(int *)data = fgetown(tp->t_sigio);
856 case TIOCEXCL: /* set exclusive use of tty */
858 SET(tp->t_state, TS_XCLUDE);
861 case TIOCFLUSH: { /* flush buffers */
862 int flags = *(int *)data;
865 flags = FREAD | FWRITE;
867 flags &= FREAD | FWRITE;
871 case TIOCCONS: /* become virtual console */
873 if (constty && constty != tp &&
874 ISSET(constty->t_state, TS_CONNECTED))
877 if ((error = suser(td)) != 0)
881 } else if (tp == constty)
884 case TIOCDRAIN: /* wait till output drained */
889 case TIOCGETA: { /* get termios struct */
890 struct termios *t = (struct termios *)data;
892 bcopy(&tp->t_termios, t, sizeof(struct termios));
895 case TIOCGETD: /* get line discipline */
896 *(int *)data = tp->t_line;
898 case TIOCGWINSZ: /* get window size */
899 *(struct winsize *)data = tp->t_winsize;
901 case TIOCGPGRP: /* get pgrp of tty */
904 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
907 case TIOCHPCL: /* hang up on last close */
909 SET(tp->t_cflag, HUPCL);
913 case TIOCNXCL: /* reset exclusive use of tty */
915 CLR(tp->t_state, TS_XCLUDE);
918 case TIOCOUTQ: /* output queue size */
919 *(int *)data = tp->t_outq.c_cc;
921 case TIOCSETA: /* set termios struct */
922 case TIOCSETAW: /* drain output, set */
923 case TIOCSETAF: { /* drn out, fls in, set */
924 struct termios *t = (struct termios *)data;
926 if (t->c_ispeed == 0)
927 t->c_ispeed = t->c_ospeed;
928 if (t->c_ispeed == 0)
929 t->c_ispeed = tp->t_ospeed;
930 if (t->c_ispeed == 0)
933 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
939 if (cmd == TIOCSETAF)
942 if (!ISSET(t->c_cflag, CIGNORE)) {
944 * Set device hardware.
946 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
950 if (ISSET(t->c_cflag, CLOCAL) &&
951 !ISSET(tp->t_cflag, CLOCAL)) {
953 * XXX disconnections would be too hard to
954 * get rid of without this kludge. The only
955 * way to get rid of controlling terminals
956 * is to exit from the session leader.
958 CLR(tp->t_state, TS_ZOMBIE);
960 wakeup(TSA_CARR_ON(tp));
964 if ((ISSET(tp->t_state, TS_CARR_ON) ||
965 ISSET(t->c_cflag, CLOCAL)) &&
966 !ISSET(tp->t_state, TS_ZOMBIE))
967 SET(tp->t_state, TS_CONNECTED);
969 CLR(tp->t_state, TS_CONNECTED);
970 tp->t_cflag = t->c_cflag;
971 tp->t_ispeed = t->c_ispeed;
972 if (t->c_ospeed != 0)
973 tp->t_ospeed = t->c_ospeed;
976 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
978 if (ISSET(t->c_lflag, ICANON))
979 SET(tp->t_lflag, PENDIN);
982 * XXX we really shouldn't allow toggling
983 * ICANON while we're in a non-termios line
984 * discipline. Now we have to worry about
985 * panicing for a null queue.
987 if (tp->t_canq.c_cbreserved > 0 &&
988 tp->t_rawq.c_cbreserved > 0) {
989 catq(&tp->t_rawq, &tp->t_canq);
991 * XXX the queue limits may be
992 * different, so the old queue
993 * swapping method no longer works.
995 catq(&tp->t_canq, &tp->t_rawq);
997 CLR(tp->t_lflag, PENDIN);
1001 tp->t_iflag = t->c_iflag;
1002 tp->t_oflag = t->c_oflag;
1004 * Make the EXTPROC bit read only.
1006 if (ISSET(tp->t_lflag, EXTPROC))
1007 SET(t->c_lflag, EXTPROC);
1009 CLR(t->c_lflag, EXTPROC);
1010 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1011 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1012 t->c_cc[VTIME] != tp->t_cc[VTIME])
1014 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1018 case TIOCSETD: { /* set line discipline */
1019 int t = *(int *)data;
1020 dev_t device = tp->t_dev;
1022 if ((u_int)t >= nlinesw)
1024 if (t != tp->t_line) {
1026 (*linesw[tp->t_line].l_close)(tp, flag);
1027 error = (*linesw[t].l_open)(device, tp);
1029 (void)(*linesw[tp->t_line].l_open)(device, tp);
1038 case TIOCSTART: /* start output, like ^Q */
1040 if (ISSET(tp->t_state, TS_TTSTOP) ||
1041 ISSET(tp->t_lflag, FLUSHO)) {
1042 CLR(tp->t_lflag, FLUSHO);
1043 CLR(tp->t_state, TS_TTSTOP);
1048 case TIOCSTI: /* simulate terminal input */
1049 if ((flag & FREAD) == 0 && suser(td))
1051 if (!isctty(p, tp) && suser(td))
1054 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1057 case TIOCSTOP: /* stop output, like ^S */
1059 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1060 SET(tp->t_state, TS_TTSTOP);
1061 (*tp->t_stop)(tp, 0);
1065 case TIOCSCTTY: /* become controlling tty */
1066 /* Session ctty vnode pointer set in vnode layer. */
1067 if (!SESS_LEADER(p) ||
1068 ((p->p_session->s_ttyvp || tp->t_session) &&
1069 (tp->t_session != p->p_session)))
1071 tp->t_session = p->p_session;
1072 tp->t_pgrp = p->p_pgrp;
1073 p->p_session->s_ttyp = tp;
1074 p->p_flag |= P_CONTROLT;
1076 case TIOCSPGRP: { /* set pgrp of tty */
1077 struct pgrp *pgrp = pgfind(*(int *)data);
1081 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1086 case TIOCSTAT: /* simulate control-T */
1091 case TIOCSWINSZ: /* set window size */
1092 if (bcmp((caddr_t)&tp->t_winsize, data,
1093 sizeof (struct winsize))) {
1094 tp->t_winsize = *(struct winsize *)data;
1095 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1098 case TIOCSDRAINWAIT:
1102 tp->t_timeout = *(int *)data * hz;
1103 wakeup(TSA_OCOMPLETE(tp));
1104 wakeup(TSA_OLOWAT(tp));
1106 case TIOCGDRAINWAIT:
1107 *(int *)data = tp->t_timeout / hz;
1110 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1111 return (ttcompat(tp, cmd, data, flag));
1120 ttypoll(dev, events, td)
1129 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1130 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1134 if (events & (POLLIN | POLLRDNORM)) {
1135 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1136 revents |= events & (POLLIN | POLLRDNORM);
1138 selrecord(td, &tp->t_rsel);
1140 if (events & (POLLOUT | POLLWRNORM)) {
1141 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1142 ISSET(tp->t_state, TS_CONNECTED))
1143 || ISSET(tp->t_state, TS_ZOMBIE))
1144 revents |= events & (POLLOUT | POLLWRNORM);
1146 selrecord(td, &tp->t_wsel);
1152 static struct filterops ttyread_filtops =
1153 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1154 static struct filterops ttywrite_filtops =
1155 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1158 ttykqfilter(dev, kn)
1162 struct tty *tp = dev->si_tty;
1163 struct klist *klist;
1165 switch (kn->kn_filter) {
1167 klist = &tp->t_rsel.si_note;
1168 kn->kn_fop = &ttyread_filtops;
1171 klist = &tp->t_wsel.si_note;
1172 kn->kn_fop = &ttywrite_filtops;
1178 kn->kn_hook = (caddr_t)dev;
1181 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1188 filt_ttyrdetach(struct knote *kn)
1190 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1193 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1198 filt_ttyread(struct knote *kn, long hint)
1200 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1202 kn->kn_data = ttnread(tp);
1203 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1204 kn->kn_flags |= EV_EOF;
1207 return (kn->kn_data > 0);
1211 filt_ttywdetach(struct knote *kn)
1213 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1216 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1221 filt_ttywrite(kn, hint)
1225 struct tty *tp = ((dev_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.
1243 if (ISSET(tp->t_lflag, PENDIN))
1245 nread = tp->t_canq.c_cc;
1246 if (!ISSET(tp->t_lflag, ICANON)) {
1247 nread += tp->t_rawq.c_cc;
1248 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1255 * Wait for output to drain.
1265 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1266 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1268 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1269 ISSET(tp->t_state, TS_CONNECTED)) {
1270 SET(tp->t_state, TS_SO_OCOMPLETE);
1271 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1275 if (error == EWOULDBLOCK)
1282 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1289 * Flush if successfully wait.
1297 if ((error = ttywait(tp)) == 0)
1298 ttyflush(tp, FREAD);
1303 * Flush tty read and/or write queues, notifying anyone waiting.
1315 FLUSHQ(&tp->t_outq);
1316 CLR(tp->t_state, TS_TTSTOP);
1318 (*tp->t_stop)(tp, rw);
1320 FLUSHQ(&tp->t_canq);
1321 FLUSHQ(&tp->t_rawq);
1322 CLR(tp->t_lflag, PENDIN);
1325 CLR(tp->t_state, TS_LOCAL);
1327 if (ISSET(tp->t_state, TS_TBLOCK)) {
1329 FLUSHQ(&tp->t_outq);
1333 * Don't let leave any state that might clobber the
1334 * next line discipline (although we should do more
1335 * to send the START char). Not clearing the state
1336 * may have caused the "putc to a clist with no
1337 * reserved cblocks" panic/printf.
1339 CLR(tp->t_state, TS_TBLOCK);
1341 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1342 if (ISSET(tp->t_iflag, IXOFF)) {
1344 * XXX wait a bit in the hope that the stop
1345 * character (if any) will go out. Waiting
1346 * isn't good since it allows races. This
1347 * will be fixed when the stop character is
1348 * put in a special queue. Don't bother with
1349 * the checks in ttywait() since the timeout
1352 SET(tp->t_state, TS_SO_OCOMPLETE);
1353 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1356 * Don't try sending the stop character again.
1358 CLR(tp->t_state, TS_TBLOCK);
1365 FLUSHQ(&tp->t_outq);
1372 * Copy in the default termios characters.
1379 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1390 termioschars(&tp->t_termios);
1394 * Handle input high water. Send stop character for the IXOFF case. Turn
1395 * on our input flow control bit and propagate the changes to the driver.
1396 * XXX the stop character should be put in a special high priority queue.
1403 SET(tp->t_state, TS_TBLOCK);
1404 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1405 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1406 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1411 * Handle input low water. Send start character for the IXOFF case. Turn
1412 * off our input flow control bit and propagate the changes to the driver.
1413 * XXX the start character should be put in a special high priority queue.
1420 CLR(tp->t_state, TS_TBLOCK);
1421 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1422 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1423 SET(tp->t_state, TS_TBLOCK); /* try again later */
1428 /* Not used by any current (i386) drivers. */
1430 * Restart after an inter-char delay.
1438 KASSERT(tp_arg != NULL, ("ttrstrt"));
1442 CLR(tp->t_state, TS_TIMEOUT);
1453 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1459 * "close" a line discipline
1467 if (flag & FNONBLOCK || ttywflush(tp))
1468 ttyflush(tp, FREAD | FWRITE);
1473 * Handle modem control transition on a tty.
1474 * Flag indicates new state of carrier.
1475 * Returns 0 if the line should be turned off, otherwise 1.
1483 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1485 * MDMBUF: do flow control according to carrier flag
1486 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1487 * works if IXON and IXANY are clear.
1490 CLR(tp->t_state, TS_CAR_OFLOW);
1491 CLR(tp->t_state, TS_TTSTOP);
1493 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1494 SET(tp->t_state, TS_CAR_OFLOW);
1495 SET(tp->t_state, TS_TTSTOP);
1496 (*tp->t_stop)(tp, 0);
1498 } else if (flag == 0) {
1502 CLR(tp->t_state, TS_CARR_ON);
1503 if (ISSET(tp->t_state, TS_ISOPEN) &&
1504 !ISSET(tp->t_cflag, CLOCAL)) {
1505 SET(tp->t_state, TS_ZOMBIE);
1506 CLR(tp->t_state, TS_CONNECTED);
1507 if (tp->t_session && tp->t_session->s_leader)
1508 psignal(tp->t_session->s_leader, SIGHUP);
1509 ttyflush(tp, FREAD | FWRITE);
1516 SET(tp->t_state, TS_CARR_ON);
1517 if (!ISSET(tp->t_state, TS_ZOMBIE))
1518 SET(tp->t_state, TS_CONNECTED);
1519 wakeup(TSA_CARR_ON(tp));
1527 * Reinput pending characters after state switch
1528 * call from a critical section.
1537 CLR(tp->t_lflag, PENDIN);
1538 SET(tp->t_state, TS_TYPEN);
1540 * XXX this assumes too much about clist internals. It may even
1541 * fail if the cblock slush pool is empty. We can't allocate more
1542 * cblocks here because we are called from an interrupt handler
1543 * and clist_alloc_cblocks() can wait.
1546 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1547 tp->t_rawq.c_cbmax = tq.c_cbmax;
1548 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1549 while ((c = getc(&tq)) >= 0)
1551 CLR(tp->t_state, TS_TYPEN);
1555 * Process a read call on a tty device.
1558 ttread(tp, uio, flag)
1566 cc_t *cc = tp->t_cc;
1568 int first, error = 0;
1569 int has_stime = 0, last_cc = 0;
1570 long slp = 0; /* XXX this should be renamed `timo'. */
1571 struct timeval stime;
1575 lflag = tp->t_lflag;
1577 * take pending input first
1579 if (ISSET(lflag, PENDIN)) {
1581 splz(); /* reduce latency */
1582 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1586 * Hang process if it's in the background.
1588 if ((pp = curproc) && isbackground(pp, tp)) {
1590 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1591 SIGISMEMBER(pp->p_sigmask, SIGTTIN) ||
1592 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1594 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1595 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1601 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1603 return (0); /* EOF */
1607 * If canonical, use the canonical queue,
1608 * else use the raw queue.
1610 * (should get rid of clists...)
1612 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1614 if (flag & IO_NDELAY) {
1617 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1622 return (EWOULDBLOCK);
1624 if (!ISSET(lflag, ICANON)) {
1627 struct timeval timecopy;
1630 * Check each of the four combinations.
1631 * (m > 0 && t == 0) is the normal read case.
1632 * It should be fairly efficient, so we check that and its
1633 * companion case (m == 0 && t == 0) first.
1634 * For the other two cases, we compute the target sleep time
1643 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1647 t *= 100000; /* time in us */
1648 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1649 ((t1).tv_usec - (t2).tv_usec))
1655 getmicrotime(&timecopy);
1657 /* first character, start timer */
1661 } else if (qp->c_cc > last_cc) {
1662 /* got a character, restart timer */
1666 /* nothing, check expiration */
1667 slp = t - diff(timecopy, stime);
1672 } else { /* m == 0 */
1675 getmicrotime(&timecopy);
1681 slp = t - diff(timecopy, stime);
1683 /* Timed out, but 0 is enough input. */
1691 * Rounding down may make us wake up just short
1692 * of the target, so we round up.
1693 * The formula is ceiling(slp * hz/1000000).
1694 * 32-bit arithmetic is enough for hz < 169.
1695 * XXX see tvtohz() for how to avoid overflow if hz
1696 * is large (divide by `tick' and/or arrange to
1697 * use tvtohz() if hz is large).
1699 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1702 if (qp->c_cc <= 0) {
1705 * There is no input, or not enough input and we can block.
1707 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1708 ISSET(tp->t_state, TS_CONNECTED) ?
1709 "ttyin" : "ttyhup", (int)slp);
1711 if (error == EWOULDBLOCK)
1716 * XXX what happens if another process eats some input
1717 * while we are asleep (not just here)? It would be
1718 * safest to detect changes and reset our state variables
1719 * (has_stime and last_cc).
1727 * Input present, check for input mapping and processing.
1730 if (ISSET(lflag, ICANON | ISIG))
1736 icc = imin(uio->uio_resid, IBUFSIZ);
1737 icc = q_to_b(qp, ibuf, icc);
1743 error = uiomove(ibuf, icc, uio);
1745 * XXX if there was an error then we should ungetc() the
1746 * unmoved chars and reduce icc here.
1750 if (uio->uio_resid == 0)
1764 * delayed suspend (^Y)
1766 if (CCEQ(cc[VDSUSP], c) &&
1767 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1768 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1770 error = ttysleep(tp, &lbolt, PCATCH,
1779 * Interpret EOF only in canonical mode.
1781 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1784 * Give user character.
1786 error = ureadc(c, uio);
1788 /* XXX should ungetc(c, qp). */
1790 if (uio->uio_resid == 0)
1793 * In canonical mode check for a "break character"
1794 * marking the end of a "line of input".
1796 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1803 * Look to unblock input now that (presumably)
1804 * the input queue has gone down.
1807 if (ISSET(tp->t_state, TS_TBLOCK) &&
1808 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1816 * Check the output queue on tp for space for a kernel message (from uprintf
1817 * or tprintf). Allow some space over the normal hiwater mark so we don't
1818 * lose messages due to normal flow control, but don't let the tty run amok.
1819 * Sleeps here are not interruptible, but we return prematurely if new signals
1823 ttycheckoutq(tp, wait)
1830 hiwat = tp->t_ohiwat;
1831 SIGEMPTYSET(oldmask);
1834 oldmask = curproc->p_siglist;
1835 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1836 while (tp->t_outq.c_cc > hiwat) {
1838 if (tp->t_outq.c_cc <= hiwat)
1840 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1844 SET(tp->t_state, TS_SO_OLOWAT);
1845 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1853 * Process a write call on a tty device.
1856 ttwrite(tp, uio, flag)
1864 int i, hiwat, cnt, error;
1867 hiwat = tp->t_ohiwat;
1868 cnt = uio->uio_resid;
1873 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1875 if (uio->uio_resid == cnt)
1879 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1880 if (flag & IO_NDELAY) {
1882 error = EWOULDBLOCK;
1885 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1894 * Hang the process if it's in the background.
1896 if ((pp = curproc) && isbackground(pp, tp) &&
1897 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1898 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1899 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) {
1900 if (pp->p_pgrp->pg_jobc == 0) {
1904 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1905 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1911 * Process the user's data in at most OBUFSIZ chunks. Perform any
1912 * output translation. Keep track of high water mark, sleep on
1913 * overflow awaiting device aid in acquiring new space.
1915 while (uio->uio_resid > 0 || cc > 0) {
1916 if (ISSET(tp->t_lflag, FLUSHO)) {
1920 if (tp->t_outq.c_cc > hiwat)
1923 * Grab a hunk of data from the user, unless we have some
1924 * leftover from last time.
1927 cc = imin(uio->uio_resid, OBUFSIZ);
1929 error = uiomove(cp, cc, uio);
1936 * If nothing fancy need be done, grab those characters we
1937 * can handle without any of ttyoutput's processing and
1938 * just transfer them to the output q. For those chars
1939 * which require special processing (as indicated by the
1940 * bits in char_type), call ttyoutput. After processing
1941 * a hunk of data, look for FLUSHO so ^O's will take effect
1945 if (!ISSET(tp->t_oflag, OPOST))
1948 ce = cc - scanc((u_int)cc, (u_char *)cp,
1949 char_type, CCLASSMASK);
1951 * If ce is zero, then we're processing
1952 * a special character through ttyoutput.
1956 if (ttyoutput(*cp, tp) >= 0) {
1957 /* No Clists, wait a bit. */
1959 if (flag & IO_NDELAY) {
1960 error = EWOULDBLOCK;
1963 error = ttysleep(tp, &lbolt,
1972 if (ISSET(tp->t_lflag, FLUSHO) ||
1973 tp->t_outq.c_cc > hiwat)
1979 * A bunch of normal characters have been found.
1980 * Transfer them en masse to the output queue and
1981 * continue processing at the top of the loop.
1982 * If there are any further characters in this
1983 * <= OBUFSIZ chunk, the first should be a character
1984 * requiring special handling by ttyoutput.
1987 i = b_to_q(cp, ce, &tp->t_outq);
1990 cp += ce, cc -= ce, tk_nout += ce;
1993 /* No Clists, wait a bit. */
1995 if (flag & IO_NDELAY) {
1996 error = EWOULDBLOCK;
1999 error = ttysleep(tp, &lbolt, PCATCH,
2005 if (ISSET(tp->t_lflag, FLUSHO) ||
2006 tp->t_outq.c_cc > hiwat)
2013 * If cc is nonzero, we leave the uio structure inconsistent, as the
2014 * offset and iov pointers have moved forward, but it doesn't matter
2015 * (the call will either return short or restart with a new uio).
2017 uio->uio_resid += cc;
2024 * This can only occur if FLUSHO is set in t_lflag,
2025 * or if ttstart/oproc is synchronous (or very fast).
2027 if (tp->t_outq.c_cc <= hiwat) {
2031 if (flag & IO_NDELAY) {
2033 uio->uio_resid += cc;
2034 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2036 SET(tp->t_state, TS_SO_OLOWAT);
2037 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2039 if (error == EWOULDBLOCK)
2047 * Rubout one character from the rawq of tp
2048 * as cleanly as possible.
2059 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2061 CLR(tp->t_lflag, FLUSHO);
2062 if (ISSET(tp->t_lflag, ECHOE)) {
2063 if (tp->t_rocount == 0) {
2065 * Screwed by ttwrite; retype
2070 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2073 CLR(c, ~TTY_CHARMASK);
2074 switch (CCLASS(c)) {
2083 if (ISSET(tp->t_lflag, ECHOCTL))
2087 if (tp->t_rocount < tp->t_rawq.c_cc) {
2092 savecol = tp->t_column;
2093 SET(tp->t_state, TS_CNTTB);
2094 SET(tp->t_lflag, FLUSHO);
2095 tp->t_column = tp->t_rocol;
2096 cp = tp->t_rawq.c_cf;
2098 tabc = *cp; /* XXX FIX NEXTC */
2099 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2101 CLR(tp->t_lflag, FLUSHO);
2102 CLR(tp->t_state, TS_CNTTB);
2105 /* savecol will now be length of the tab. */
2106 savecol -= tp->t_column;
2107 tp->t_column += savecol;
2109 savecol = 8; /* overflow screw */
2110 while (--savecol >= 0)
2111 (void)ttyoutput('\b', tp);
2114 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2115 (void)printf(PANICSTR, c, CCLASS(c));
2117 panic(PANICSTR, c, CCLASS(c));
2121 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2122 if (!ISSET(tp->t_state, TS_ERASE)) {
2123 SET(tp->t_state, TS_ERASE);
2124 (void)ttyoutput('\\', tp);
2128 ttyecho(tp->t_cc[VERASE], tp);
2130 * This code may be executed not only when an ERASE key
2131 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2132 * So, I didn't think it was worthwhile to pass the extra
2133 * information (which would need an extra parameter,
2134 * changing every call) needed to distinguish the ERASE2
2135 * case from the ERASE.
2142 * Back over cnt characters, erasing them.
2151 (void)ttyoutput('\b', tp);
2152 (void)ttyoutput(' ', tp);
2153 (void)ttyoutput('\b', tp);
2159 * Reprint the rawq line. Note, it is assumed that c_cc has already
2169 /* Echo the reprint character. */
2170 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2171 ttyecho(tp->t_cc[VREPRINT], tp);
2173 (void)ttyoutput('\n', tp);
2177 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2178 * BIT OF FIRST CHAR.
2181 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2182 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2184 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2185 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2187 CLR(tp->t_state, TS_ERASE);
2190 tp->t_rocount = tp->t_rawq.c_cc;
2195 * Echo a typed character to the terminal.
2203 if (!ISSET(tp->t_state, TS_CNTTB))
2204 CLR(tp->t_lflag, FLUSHO);
2205 if ((!ISSET(tp->t_lflag, ECHO) &&
2206 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2207 ISSET(tp->t_lflag, EXTPROC))
2209 if (ISSET(tp->t_lflag, ECHOCTL) &&
2210 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2211 ISSET(c, TTY_CHARMASK) == 0177)) {
2212 (void)ttyoutput('^', tp);
2213 CLR(c, ~TTY_CHARMASK);
2219 (void)ttyoutput(c, tp);
2223 * Wake up any readers on a tty.
2230 if (tp->t_rsel.si_pid != 0)
2231 selwakeup(&tp->t_rsel);
2232 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2233 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2234 wakeup(TSA_HUP_OR_INPUT(tp));
2235 KNOTE(&tp->t_rsel.si_note, 0);
2239 * Wake up any writers on a tty.
2246 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2247 selwakeup(&tp->t_wsel);
2248 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2249 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2250 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2251 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2252 CLR(tp->t_state, TS_SO_OCOMPLETE);
2253 wakeup(TSA_OCOMPLETE(tp));
2255 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2256 tp->t_outq.c_cc <= tp->t_olowat) {
2257 CLR(tp->t_state, TS_SO_OLOWAT);
2258 wakeup(TSA_OLOWAT(tp));
2260 KNOTE(&tp->t_wsel.si_note, 0);
2264 * Look up a code for a specified speed in a conversion table;
2265 * used by drivers to map software speed values to hardware parameters.
2268 ttspeedtab(speed, table)
2270 struct speedtab *table;
2273 for ( ; table->sp_speed != -1; table++)
2274 if (table->sp_speed == speed)
2275 return (table->sp_code);
2280 * Set input and output watermarks and buffer sizes. For input, the
2281 * high watermark is about one second's worth of input above empty, the
2282 * low watermark is slightly below high water, and the buffer size is a
2283 * driver-dependent amount above high water. For output, the watermarks
2284 * are near the ends of the buffer, with about 1 second's worth of input
2285 * between them. All this only applies to the standard line discipline.
2291 int cps, ttmaxhiwat, x;
2294 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2295 switch (tp->t_ispeedwat) {
2297 cps = tp->t_ispeed / 10;
2301 * This case is for old drivers that don't know about
2302 * t_ispeedwat. Arrange for them to get the old buffer
2303 * sizes and watermarks.
2305 cps = TTYHOG - 2 * 256;
2306 tp->t_ififosize = 2 * 256;
2309 cps = tp->t_ispeedwat / 10;
2313 tp->t_ilowat = 7 * cps / 8;
2314 x = cps + tp->t_ififosize;
2315 clist_alloc_cblocks(&tp->t_rawq, x, x);
2318 switch (tp->t_ospeedwat) {
2320 cps = tp->t_ospeed / 10;
2321 ttmaxhiwat = 2 * TTMAXHIWAT;
2324 cps = tp->t_ospeed / 10;
2325 ttmaxhiwat = TTMAXHIWAT;
2328 cps = tp->t_ospeedwat / 10;
2329 ttmaxhiwat = 8 * TTMAXHIWAT;
2332 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2333 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2335 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2336 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2337 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2339 clist_alloc_cblocks(&tp->t_outq, x, x);
2344 * Report on state of foreground process group.
2350 struct proc *p, *pick;
2351 struct timeval utime, stime;
2354 if (ttycheckoutq(tp,0) == 0)
2358 * We always print the load average, then figure out what else to
2359 * print based on the state of the current process group.
2361 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2362 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2364 if (tp->t_session == NULL) {
2365 ttyprintf(tp, "not a controlling terminal\n");
2366 } else if (tp->t_pgrp == NULL) {
2367 ttyprintf(tp, "no foreground process group\n");
2368 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2369 ttyprintf(tp, "empty foreground process group\n");
2372 * Pick an interesting process. Note that certain elements,
2373 * in particular the wmesg, require a critical section for
2374 * safe access (YYY and we are still not MP safe).
2376 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2377 * p_thread->td_comm.
2387 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2388 if (proc_compare(pick, p))
2393 * Figure out what wait/process-state message, and command
2396 if (pick->p_thread == NULL)
2398 else if (pick->p_stat == SRUN)
2400 else if (pick->p_wmesg) /* p_thread must not be NULL */
2401 str = pick->p_wmesg;
2405 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2406 (pick->p_thread ? pick->p_comm : "?"),
2410 * Calculate cpu usage, percent cpu, and cmsz. Note that
2411 * 'pick' becomes invalid the moment we exit the critical
2414 if (pick->p_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) {
2415 calcru(pick, &utime, &stime, NULL);
2421 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2423 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE))
2426 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2433 ttyprintf(tp, " %s ", buf);
2435 ttyprintf(tp, "%ld.%02ldu ",
2436 utime.tv_sec, utime.tv_usec / 10000);
2437 ttyprintf(tp, "%ld.%02lds ",
2438 stime.tv_sec, stime.tv_usec / 10000);
2440 ttyprintf(tp, "?.??u ?.??s ");
2442 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2444 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2448 * Returns 1 if p2 is "better" than p1
2450 * The algorithm for picking the "interesting" process is thus:
2452 * 1) Only foreground processes are eligible - implied.
2453 * 2) Runnable processes are favored over anything else. The runner
2454 * with the highest cpu utilization is picked (p_cpticks). Ties are
2455 * broken by picking the highest pid.
2456 * 3) The sleeper with the shortest sleep time is next. With ties,
2457 * we pick out just "short-term" sleepers (P_SINTR == 0).
2458 * 4) Further ties are broken by picking the highest pid.
2460 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2461 #define TESTAB(a, b) ((a)<<1 | (b))
2467 proc_compare(p1, p2)
2468 struct proc *p1, *p2;
2474 * see if at least one of them is runnable
2476 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2483 * tie - favor one with highest recent cpu utilization
2485 if (p2->p_cpticks > p1->p_cpticks)
2487 if (p1->p_cpticks > p2->p_cpticks)
2489 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2494 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) {
2500 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2503 * pick the one with the smallest sleep time
2505 if (p2->p_slptime > p1->p_slptime)
2507 if (p1->p_slptime > p2->p_slptime)
2510 * favor one sleeping in a non-interruptible sleep
2512 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2514 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2516 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2520 * Output char to tty; console putchar style.
2528 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2533 (void)ttyoutput('\r', tp);
2534 (void)ttyoutput(c, tp);
2541 * Sleep on chan, returning ERESTART if tty changed while we napped and
2542 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2543 * the tty is revoked, restarting a pending call will redo validation done
2544 * at the start of the call.
2547 ttysleep(tp, chan, slpflags, wmesg, timo)
2557 error = tsleep(chan, slpflags, wmesg, timo);
2560 return (tp->t_gen == gen ? 0 : ERESTART);
2564 * Allocate a tty struct. Clists in the struct will be allocated by
2574 tp = malloc(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.
2600 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2604 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2608 SLIST_FOREACH(tp, &tty_list, t_list) {
2611 t.t_dev = (dev_t)dev2udev(t.t_dev);
2612 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2619 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2620 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2632 ttyread(dev, uio, flag)
2642 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2646 ttywrite(dev, uio, flag)
2656 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));