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
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
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34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.8 2003/10/13 21:08:48 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>
84 #include <sys/fcntl.h>
86 #include <sys/dkstat.h>
88 #include <sys/kernel.h>
89 #include <sys/vnode.h>
90 #include <sys/signalvar.h>
91 #include <sys/resourcevar.h>
92 #include <sys/malloc.h>
93 #include <sys/filedesc.h>
94 #include <sys/sysctl.h>
99 #include <vm/vm_map.h>
101 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
103 static int proc_compare (struct proc *p1, struct proc *p2);
104 static int ttnread (struct tty *tp);
105 static void ttyecho (int c, struct tty *tp);
106 static int ttyoutput (int c, struct tty *tp);
107 static void ttypend (struct tty *tp);
108 static void ttyretype (struct tty *tp);
109 static void ttyrub (int c, struct tty *tp);
110 static void ttyrubo (struct tty *tp, int cnt);
111 static void ttyunblock (struct tty *tp);
112 static int ttywflush (struct tty *tp);
113 static int filt_ttyread (struct knote *kn, long hint);
114 static void filt_ttyrdetach (struct knote *kn);
115 static int filt_ttywrite (struct knote *kn, long hint);
116 static void filt_ttywdetach (struct knote *kn);
119 * Table with character classes and parity. The 8th bit indicates parity,
120 * the 7th bit indicates the character is an alphameric or underscore (for
121 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
122 * are 0 then the character needs no special processing on output; classes
123 * other than 0 might be translated or (not currently) require delays.
125 #define E 0x00 /* Even parity. */
126 #define O 0x80 /* Odd parity. */
127 #define PARITY(c) (char_type[c] & O)
129 #define ALPHA 0x40 /* Alpha or underscore. */
130 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
132 #define CCLASSMASK 0x3f
133 #define CCLASS(c) (char_type[c] & CCLASSMASK)
138 #define NA ORDINARY | ALPHA
144 static u_char const char_type[] = {
145 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
146 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
147 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
149 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
150 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
151 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
152 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
153 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
156 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
157 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
158 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
159 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
160 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
162 * Meta chars; should be settable per character set;
163 * for now, treat them all as normal characters.
165 NA, NA, NA, NA, NA, NA, NA, NA,
166 NA, NA, NA, NA, NA, NA, NA, NA,
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,
191 /* Macros to clear/set/test flags. */
192 #define SET(t, f) (t) |= (f)
193 #define CLR(t, f) (t) &= ~(f)
194 #define ISSET(t, f) ((t) & (f))
196 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
197 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
200 * list of struct tty where pstat(8) can pick it up with sysctl
202 static SLIST_HEAD(, tty) tty_list;
205 * Initial open of tty, or (re)entry to standard tty line discipline.
216 if (!ISSET(tp->t_state, TS_ISOPEN)) {
217 SET(tp->t_state, TS_ISOPEN);
218 if (ISSET(tp->t_cflag, CLOCAL))
219 SET(tp->t_state, TS_CONNECTED);
220 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
228 * Handle close() on a tty line: flush and set to initial state,
229 * bumping generation number so that pending read/write calls
230 * can detect recycling of the tty.
231 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
232 * and l_close() should have flushed, but we repeat the spltty() and
233 * the flush in case there are buggy callers.
241 funsetown(tp->t_sigio);
246 ttyflush(tp, FREAD | FWRITE);
247 clist_free_cblocks(&tp->t_canq);
248 clist_free_cblocks(&tp->t_outq);
249 clist_free_cblocks(&tp->t_rawq);
252 tp->t_line = TTYDISC;
254 tp->t_session = NULL;
260 #define FLUSHQ(q) { \
262 ndflush(q, (q)->c_cc); \
265 /* Is 'c' a line delimiter ("break" character)? */
266 #define TTBREAKC(c, lflag) \
267 ((c) == '\n' || (((c) == cc[VEOF] || \
268 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
269 (c) != _POSIX_VDISABLE))
272 * Process input of a single character received on a tty.
279 tcflag_t iflag, lflag;
284 * If input is pending take it first.
287 if (ISSET(lflag, PENDIN))
292 if (ISSET(lflag, ICANON)) {
302 * Block further input iff:
303 * current input > threshold AND input is available to user program
304 * AND input flow control is enabled and not yet invoked.
305 * The 3 is slop for PARMRK.
308 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
309 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
310 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
311 !ISSET(tp->t_state, TS_TBLOCK))
314 /* Handle exceptional conditions (break, parity, framing). */
316 err = (ISSET(c, TTY_ERRORMASK));
318 CLR(c, TTY_ERRORMASK);
319 if (ISSET(err, TTY_BI)) {
320 if (ISSET(iflag, IGNBRK))
322 if (ISSET(iflag, BRKINT)) {
323 ttyflush(tp, FREAD | FWRITE);
324 pgsignal(tp->t_pgrp, SIGINT, 1);
327 if (ISSET(iflag, PARMRK))
329 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
330 || ISSET(err, TTY_FE)) {
331 if (ISSET(iflag, IGNPAR))
333 else if (ISSET(iflag, PARMRK)) {
335 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
338 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
339 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
340 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
347 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
349 if (!ISSET(lflag, EXTPROC)) {
351 * Check for literal nexting very first
353 if (ISSET(tp->t_state, TS_LNCH)) {
355 CLR(tp->t_state, TS_LNCH);
358 * Scan for special characters. This code
359 * is really just a big case statement with
360 * non-constant cases. The bottom of the
361 * case statement is labeled ``endcase'', so goto
362 * it after a case match, or similar.
366 * Control chars which aren't controlled
367 * by ICANON, ISIG, or IXON.
369 if (ISSET(lflag, IEXTEN)) {
370 if (CCEQ(cc[VLNEXT], c)) {
371 if (ISSET(lflag, ECHO)) {
372 if (ISSET(lflag, ECHOE)) {
373 (void)ttyoutput('^', tp);
374 (void)ttyoutput('\b', tp);
378 SET(tp->t_state, TS_LNCH);
381 if (CCEQ(cc[VDISCARD], c)) {
382 if (ISSET(lflag, FLUSHO))
383 CLR(tp->t_lflag, FLUSHO);
385 ttyflush(tp, FWRITE);
387 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
389 SET(tp->t_lflag, FLUSHO);
397 if (ISSET(lflag, ISIG)) {
398 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
399 if (!ISSET(lflag, NOFLSH))
400 ttyflush(tp, FREAD | FWRITE);
403 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
406 if (CCEQ(cc[VSUSP], c)) {
407 if (!ISSET(lflag, NOFLSH))
410 pgsignal(tp->t_pgrp, SIGTSTP, 1);
415 * Handle start/stop characters.
417 if (ISSET(iflag, IXON)) {
418 if (CCEQ(cc[VSTOP], c)) {
419 if (!ISSET(tp->t_state, TS_TTSTOP)) {
420 SET(tp->t_state, TS_TTSTOP);
421 (*tp->t_stop)(tp, 0);
424 if (!CCEQ(cc[VSTART], c))
427 * if VSTART == VSTOP then toggle
431 if (CCEQ(cc[VSTART], c))
435 * IGNCR, ICRNL, & INLCR
438 if (ISSET(iflag, IGNCR))
440 else if (ISSET(iflag, ICRNL))
442 } else if (c == '\n' && ISSET(iflag, INLCR))
445 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
447 * From here on down canonical mode character
448 * processing takes place.
451 * erase or erase2 (^H / ^?)
453 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
455 ttyrub(unputc(&tp->t_rawq), tp);
461 if (CCEQ(cc[VKILL], c)) {
462 if (ISSET(lflag, ECHOKE) &&
463 tp->t_rawq.c_cc == tp->t_rocount &&
464 !ISSET(lflag, ECHOPRT))
465 while (tp->t_rawq.c_cc)
466 ttyrub(unputc(&tp->t_rawq), tp);
469 if (ISSET(lflag, ECHOK) ||
470 ISSET(lflag, ECHOKE))
475 CLR(tp->t_state, TS_LOCAL);
481 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
487 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
492 * erase last char of word and remember the
493 * next chars type (for ALTWERASE)
496 c = unputc(&tp->t_rawq);
499 if (c == ' ' || c == '\t') {
500 (void)putc(c, &tp->t_rawq);
509 c = unputc(&tp->t_rawq);
512 } while (c != ' ' && c != '\t' &&
513 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
514 (void)putc(c, &tp->t_rawq);
520 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
525 * ^T - kernel info and generate SIGINFO
527 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
528 if (ISSET(lflag, ISIG))
529 pgsignal(tp->t_pgrp, SIGINFO, 1);
530 if (!ISSET(lflag, NOKERNINFO))
534 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
535 if (ISSET(lflag, ISIG))
536 pgsignal(tp->t_pgrp, SIGCKPT, 1);
541 * Check for input buffer overflow
543 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
545 if (ISSET(iflag, IMAXBEL)) {
546 if (tp->t_outq.c_cc < tp->t_ohiwat)
547 (void)ttyoutput(CTRL('g'), tp);
552 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
553 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
554 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
557 * Put data char in q for user and
558 * wakeup on seeing a line delimiter.
560 if (putc(c, &tp->t_rawq) >= 0) {
561 if (!ISSET(lflag, ICANON)) {
566 if (TTBREAKC(c, lflag)) {
568 catq(&tp->t_rawq, &tp->t_canq);
570 } else if (tp->t_rocount++ == 0)
571 tp->t_rocol = tp->t_column;
572 if (ISSET(tp->t_state, TS_ERASE)) {
574 * end of prterase \.../
576 CLR(tp->t_state, TS_ERASE);
577 (void)ttyoutput('/', tp);
581 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
583 * Place the cursor over the '^' of the ^D.
585 i = imin(2, tp->t_column - i);
587 (void)ttyoutput('\b', tp);
594 * IXANY means allow any character to restart output.
596 if (ISSET(tp->t_state, TS_TTSTOP) &&
597 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
600 CLR(tp->t_lflag, FLUSHO);
601 CLR(tp->t_state, TS_TTSTOP);
603 return (ttstart(tp));
607 * Output a single character on a tty, doing output processing
608 * as needed (expanding tabs, newline processing, etc.).
609 * Returns < 0 if succeeds, otherwise returns char to resend.
621 if (!ISSET(oflag, OPOST)) {
622 if (ISSET(tp->t_lflag, FLUSHO))
624 if (putc(c, &tp->t_outq))
631 * Do tab expansion if OXTABS is set. Special case if we external
632 * processing, we don't do the tab expansion because we'll probably
633 * get it wrong. If tab expansion needs to be done, let it happen
636 CLR(c, ~TTY_CHARMASK);
638 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
639 c = 8 - (tp->t_column & 7);
640 if (!ISSET(tp->t_lflag, FLUSHO)) {
641 s = spltty(); /* Don't interrupt tabs. */
642 c -= b_to_q(" ", c, &tp->t_outq);
648 return (c ? -1 : '\t');
650 if (c == CEOT && ISSET(oflag, ONOEOT))
654 * Newline translation: if ONLCR is set,
655 * translate newline into "\r\n".
657 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
660 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
663 /* If OCRNL is set, translate "\r" into "\n". */
664 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
666 /* If ONOCR is set, don't transmit CRs when on column 0. */
667 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
672 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
684 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
694 col = (col + 8) & ~7;
702 * Ioctls for all tty devices. Called after line-discipline specific ioctl
703 * has been called to do discipline-specific functions and/or reject any
704 * of these ioctl commands.
708 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
710 struct thread *td = curthread;
711 struct proc *p = td->td_proc;
716 /* If the ioctl involves modification, hang if in the background. */
740 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
750 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
751 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
752 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
753 if (p->p_pgrp->pg_jobc == 0)
755 pgsignal(p->p_pgrp, SIGTTOU, 1);
756 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
764 switch (cmd) { /* Process the ioctl. */
765 case FIOASYNC: /* set/clear async i/o */
768 SET(tp->t_state, TS_ASYNC);
770 CLR(tp->t_state, TS_ASYNC);
773 case FIONBIO: /* set/clear non-blocking i/o */
774 break; /* XXX: delete. */
775 case FIONREAD: /* get # bytes to read */
777 *(int *)data = ttnread(tp);
783 * Policy -- Don't allow FIOSETOWN on someone else's
786 if (tp->t_session != NULL && !isctty(p, tp))
789 error = fsetown(*(int *)data, &tp->t_sigio);
794 if (tp->t_session != NULL && !isctty(p, tp))
796 *(int *)data = fgetown(tp->t_sigio);
799 case TIOCEXCL: /* set exclusive use of tty */
801 SET(tp->t_state, TS_XCLUDE);
804 case TIOCFLUSH: { /* flush buffers */
805 int flags = *(int *)data;
808 flags = FREAD | FWRITE;
810 flags &= FREAD | FWRITE;
814 case TIOCCONS: /* become virtual console */
816 if (constty && constty != tp &&
817 ISSET(constty->t_state, TS_CONNECTED))
820 if ((error = suser(td)) != 0)
824 } else if (tp == constty)
827 case TIOCDRAIN: /* wait till output drained */
832 case TIOCGETA: { /* get termios struct */
833 struct termios *t = (struct termios *)data;
835 bcopy(&tp->t_termios, t, sizeof(struct termios));
838 case TIOCGETD: /* get line discipline */
839 *(int *)data = tp->t_line;
841 case TIOCGWINSZ: /* get window size */
842 *(struct winsize *)data = tp->t_winsize;
844 case TIOCGPGRP: /* get pgrp of tty */
847 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
850 case TIOCHPCL: /* hang up on last close */
852 SET(tp->t_cflag, HUPCL);
856 case TIOCNXCL: /* reset exclusive use of tty */
858 CLR(tp->t_state, TS_XCLUDE);
861 case TIOCOUTQ: /* output queue size */
862 *(int *)data = tp->t_outq.c_cc;
864 case TIOCSETA: /* set termios struct */
865 case TIOCSETAW: /* drain output, set */
866 case TIOCSETAF: { /* drn out, fls in, set */
867 struct termios *t = (struct termios *)data;
869 if (t->c_ispeed == 0)
870 t->c_ispeed = t->c_ospeed;
871 if (t->c_ispeed == 0)
872 t->c_ispeed = tp->t_ospeed;
873 if (t->c_ispeed == 0)
876 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
882 if (cmd == TIOCSETAF)
885 if (!ISSET(t->c_cflag, CIGNORE)) {
887 * Set device hardware.
889 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
893 if (ISSET(t->c_cflag, CLOCAL) &&
894 !ISSET(tp->t_cflag, CLOCAL)) {
896 * XXX disconnections would be too hard to
897 * get rid of without this kludge. The only
898 * way to get rid of controlling terminals
899 * is to exit from the session leader.
901 CLR(tp->t_state, TS_ZOMBIE);
903 wakeup(TSA_CARR_ON(tp));
907 if ((ISSET(tp->t_state, TS_CARR_ON) ||
908 ISSET(t->c_cflag, CLOCAL)) &&
909 !ISSET(tp->t_state, TS_ZOMBIE))
910 SET(tp->t_state, TS_CONNECTED);
912 CLR(tp->t_state, TS_CONNECTED);
913 tp->t_cflag = t->c_cflag;
914 tp->t_ispeed = t->c_ispeed;
915 if (t->c_ospeed != 0)
916 tp->t_ospeed = t->c_ospeed;
919 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
921 if (ISSET(t->c_lflag, ICANON))
922 SET(tp->t_lflag, PENDIN);
925 * XXX we really shouldn't allow toggling
926 * ICANON while we're in a non-termios line
927 * discipline. Now we have to worry about
928 * panicing for a null queue.
930 if (tp->t_canq.c_cbreserved > 0 &&
931 tp->t_rawq.c_cbreserved > 0) {
932 catq(&tp->t_rawq, &tp->t_canq);
934 * XXX the queue limits may be
935 * different, so the old queue
936 * swapping method no longer works.
938 catq(&tp->t_canq, &tp->t_rawq);
940 CLR(tp->t_lflag, PENDIN);
944 tp->t_iflag = t->c_iflag;
945 tp->t_oflag = t->c_oflag;
947 * Make the EXTPROC bit read only.
949 if (ISSET(tp->t_lflag, EXTPROC))
950 SET(t->c_lflag, EXTPROC);
952 CLR(t->c_lflag, EXTPROC);
953 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
954 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
955 t->c_cc[VTIME] != tp->t_cc[VTIME])
957 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
961 case TIOCSETD: { /* set line discipline */
962 int t = *(int *)data;
963 dev_t device = tp->t_dev;
965 if ((u_int)t >= nlinesw)
967 if (t != tp->t_line) {
969 (*linesw[tp->t_line].l_close)(tp, flag);
970 error = (*linesw[t].l_open)(device, tp);
972 (void)(*linesw[tp->t_line].l_open)(device, tp);
981 case TIOCSTART: /* start output, like ^Q */
983 if (ISSET(tp->t_state, TS_TTSTOP) ||
984 ISSET(tp->t_lflag, FLUSHO)) {
985 CLR(tp->t_lflag, FLUSHO);
986 CLR(tp->t_state, TS_TTSTOP);
991 case TIOCSTI: /* simulate terminal input */
992 if ((flag & FREAD) == 0 && suser(td))
994 if (!isctty(p, tp) && suser(td))
997 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1000 case TIOCSTOP: /* stop output, like ^S */
1002 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1003 SET(tp->t_state, TS_TTSTOP);
1004 (*tp->t_stop)(tp, 0);
1008 case TIOCSCTTY: /* become controlling tty */
1009 /* Session ctty vnode pointer set in vnode layer. */
1010 if (!SESS_LEADER(p) ||
1011 ((p->p_session->s_ttyvp || tp->t_session) &&
1012 (tp->t_session != p->p_session)))
1014 tp->t_session = p->p_session;
1015 tp->t_pgrp = p->p_pgrp;
1016 p->p_session->s_ttyp = tp;
1017 p->p_flag |= P_CONTROLT;
1019 case TIOCSPGRP: { /* set pgrp of tty */
1020 struct pgrp *pgrp = pgfind(*(int *)data);
1024 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1029 case TIOCSTAT: /* simulate control-T */
1034 case TIOCSWINSZ: /* set window size */
1035 if (bcmp((caddr_t)&tp->t_winsize, data,
1036 sizeof (struct winsize))) {
1037 tp->t_winsize = *(struct winsize *)data;
1038 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1041 case TIOCSDRAINWAIT:
1045 tp->t_timeout = *(int *)data * hz;
1046 wakeup(TSA_OCOMPLETE(tp));
1047 wakeup(TSA_OLOWAT(tp));
1049 case TIOCGDRAINWAIT:
1050 *(int *)data = tp->t_timeout / hz;
1053 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1054 return (ttcompat(tp, cmd, data, flag));
1063 ttypoll(dev, events, td)
1073 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1074 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1078 if (events & (POLLIN | POLLRDNORM)) {
1079 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1080 revents |= events & (POLLIN | POLLRDNORM);
1082 selrecord(td, &tp->t_rsel);
1084 if (events & (POLLOUT | POLLWRNORM)) {
1085 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1086 ISSET(tp->t_state, TS_CONNECTED))
1087 || ISSET(tp->t_state, TS_ZOMBIE))
1088 revents |= events & (POLLOUT | POLLWRNORM);
1090 selrecord(td, &tp->t_wsel);
1096 static struct filterops ttyread_filtops =
1097 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1098 static struct filterops ttywrite_filtops =
1099 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1102 ttykqfilter(dev, kn)
1106 struct tty *tp = dev->si_tty;
1107 struct klist *klist;
1110 switch (kn->kn_filter) {
1112 klist = &tp->t_rsel.si_note;
1113 kn->kn_fop = &ttyread_filtops;
1116 klist = &tp->t_wsel.si_note;
1117 kn->kn_fop = &ttywrite_filtops;
1123 kn->kn_hook = (caddr_t)dev;
1126 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1133 filt_ttyrdetach(struct knote *kn)
1135 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1138 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1143 filt_ttyread(struct knote *kn, long hint)
1145 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1147 kn->kn_data = ttnread(tp);
1148 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1149 kn->kn_flags |= EV_EOF;
1152 return (kn->kn_data > 0);
1156 filt_ttywdetach(struct knote *kn)
1158 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1161 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1166 filt_ttywrite(kn, hint)
1170 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1172 kn->kn_data = tp->t_outq.c_cc;
1173 if (ISSET(tp->t_state, TS_ZOMBIE))
1175 return (kn->kn_data <= tp->t_olowat &&
1176 ISSET(tp->t_state, TS_CONNECTED));
1180 * Must be called at spltty().
1188 if (ISSET(tp->t_lflag, PENDIN))
1190 nread = tp->t_canq.c_cc;
1191 if (!ISSET(tp->t_lflag, ICANON)) {
1192 nread += tp->t_rawq.c_cc;
1193 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1200 * Wait for output to drain.
1210 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1211 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1213 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1214 ISSET(tp->t_state, TS_CONNECTED)) {
1215 SET(tp->t_state, TS_SO_OCOMPLETE);
1216 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1220 if (error == EWOULDBLOCK)
1227 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1234 * Flush if successfully wait.
1242 if ((error = ttywait(tp)) == 0)
1243 ttyflush(tp, FREAD);
1248 * Flush tty read and/or write queues, notifying anyone waiting.
1262 FLUSHQ(&tp->t_outq);
1263 CLR(tp->t_state, TS_TTSTOP);
1265 (*tp->t_stop)(tp, rw);
1267 FLUSHQ(&tp->t_canq);
1268 FLUSHQ(&tp->t_rawq);
1269 CLR(tp->t_lflag, PENDIN);
1272 CLR(tp->t_state, TS_LOCAL);
1274 if (ISSET(tp->t_state, TS_TBLOCK)) {
1276 FLUSHQ(&tp->t_outq);
1280 * Don't let leave any state that might clobber the
1281 * next line discipline (although we should do more
1282 * to send the START char). Not clearing the state
1283 * may have caused the "putc to a clist with no
1284 * reserved cblocks" panic/printf.
1286 CLR(tp->t_state, TS_TBLOCK);
1288 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1289 if (ISSET(tp->t_iflag, IXOFF)) {
1291 * XXX wait a bit in the hope that the stop
1292 * character (if any) will go out. Waiting
1293 * isn't good since it allows races. This
1294 * will be fixed when the stop character is
1295 * put in a special queue. Don't bother with
1296 * the checks in ttywait() since the timeout
1299 SET(tp->t_state, TS_SO_OCOMPLETE);
1300 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1303 * Don't try sending the stop character again.
1305 CLR(tp->t_state, TS_TBLOCK);
1312 FLUSHQ(&tp->t_outq);
1319 * Copy in the default termios characters.
1326 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1337 termioschars(&tp->t_termios);
1341 * Handle input high water. Send stop character for the IXOFF case. Turn
1342 * on our input flow control bit and propagate the changes to the driver.
1343 * XXX the stop character should be put in a special high priority queue.
1350 SET(tp->t_state, TS_TBLOCK);
1351 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1352 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1353 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1358 * Handle input low water. Send start character for the IXOFF case. Turn
1359 * off our input flow control bit and propagate the changes to the driver.
1360 * XXX the start character should be put in a special high priority queue.
1367 CLR(tp->t_state, TS_TBLOCK);
1368 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1369 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1370 SET(tp->t_state, TS_TBLOCK); /* try again later */
1375 /* Not used by any current (i386) drivers. */
1377 * Restart after an inter-char delay.
1386 KASSERT(tp_arg != NULL, ("ttrstrt"));
1391 CLR(tp->t_state, TS_TIMEOUT);
1403 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1409 * "close" a line discipline
1417 if (flag & FNONBLOCK || ttywflush(tp))
1418 ttyflush(tp, FREAD | FWRITE);
1423 * Handle modem control transition on a tty.
1424 * Flag indicates new state of carrier.
1425 * Returns 0 if the line should be turned off, otherwise 1.
1433 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1435 * MDMBUF: do flow control according to carrier flag
1436 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1437 * works if IXON and IXANY are clear.
1440 CLR(tp->t_state, TS_CAR_OFLOW);
1441 CLR(tp->t_state, TS_TTSTOP);
1443 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1444 SET(tp->t_state, TS_CAR_OFLOW);
1445 SET(tp->t_state, TS_TTSTOP);
1446 (*tp->t_stop)(tp, 0);
1448 } else if (flag == 0) {
1452 CLR(tp->t_state, TS_CARR_ON);
1453 if (ISSET(tp->t_state, TS_ISOPEN) &&
1454 !ISSET(tp->t_cflag, CLOCAL)) {
1455 SET(tp->t_state, TS_ZOMBIE);
1456 CLR(tp->t_state, TS_CONNECTED);
1457 if (tp->t_session && tp->t_session->s_leader)
1458 psignal(tp->t_session->s_leader, SIGHUP);
1459 ttyflush(tp, FREAD | FWRITE);
1466 SET(tp->t_state, TS_CARR_ON);
1467 if (!ISSET(tp->t_state, TS_ZOMBIE))
1468 SET(tp->t_state, TS_CONNECTED);
1469 wakeup(TSA_CARR_ON(tp));
1477 * Reinput pending characters after state switch
1487 CLR(tp->t_lflag, PENDIN);
1488 SET(tp->t_state, TS_TYPEN);
1490 * XXX this assumes too much about clist internals. It may even
1491 * fail if the cblock slush pool is empty. We can't allocate more
1492 * cblocks here because we are called from an interrupt handler
1493 * and clist_alloc_cblocks() can wait.
1496 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1497 tp->t_rawq.c_cbmax = tq.c_cbmax;
1498 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1499 while ((c = getc(&tq)) >= 0)
1501 CLR(tp->t_state, TS_TYPEN);
1505 * Process a read call on a tty device.
1508 ttread(tp, uio, flag)
1516 cc_t *cc = tp->t_cc;
1517 struct proc *p = curproc;
1518 int s, first, error = 0;
1519 int has_stime = 0, last_cc = 0;
1520 long slp = 0; /* XXX this should be renamed `timo'. */
1521 struct timeval stime;
1525 lflag = tp->t_lflag;
1527 * take pending input first
1529 if (ISSET(lflag, PENDIN)) {
1531 splx(s); /* reduce latency */
1533 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1537 * Hang process if it's in the background.
1539 if (isbackground(p, tp)) {
1541 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1542 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1543 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1545 pgsignal(p->p_pgrp, SIGTTIN, 1);
1546 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1552 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1554 return (0); /* EOF */
1558 * If canonical, use the canonical queue,
1559 * else use the raw queue.
1561 * (should get rid of clists...)
1563 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1565 if (flag & IO_NDELAY) {
1568 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1573 return (EWOULDBLOCK);
1575 if (!ISSET(lflag, ICANON)) {
1578 struct timeval timecopy;
1581 * Check each of the four combinations.
1582 * (m > 0 && t == 0) is the normal read case.
1583 * It should be fairly efficient, so we check that and its
1584 * companion case (m == 0 && t == 0) first.
1585 * For the other two cases, we compute the target sleep time
1594 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1598 t *= 100000; /* time in us */
1599 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1600 ((t1).tv_usec - (t2).tv_usec))
1606 getmicrotime(&timecopy);
1608 /* first character, start timer */
1612 } else if (qp->c_cc > last_cc) {
1613 /* got a character, restart timer */
1617 /* nothing, check expiration */
1618 slp = t - diff(timecopy, stime);
1623 } else { /* m == 0 */
1626 getmicrotime(&timecopy);
1632 slp = t - diff(timecopy, stime);
1634 /* Timed out, but 0 is enough input. */
1642 * Rounding down may make us wake up just short
1643 * of the target, so we round up.
1644 * The formula is ceiling(slp * hz/1000000).
1645 * 32-bit arithmetic is enough for hz < 169.
1646 * XXX see tvtohz() for how to avoid overflow if hz
1647 * is large (divide by `tick' and/or arrange to
1648 * use tvtohz() if hz is large).
1650 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1653 if (qp->c_cc <= 0) {
1656 * There is no input, or not enough input and we can block.
1658 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1659 ISSET(tp->t_state, TS_CONNECTED) ?
1660 "ttyin" : "ttyhup", (int)slp);
1662 if (error == EWOULDBLOCK)
1667 * XXX what happens if another process eats some input
1668 * while we are asleep (not just here)? It would be
1669 * safest to detect changes and reset our state variables
1670 * (has_stime and last_cc).
1678 * Input present, check for input mapping and processing.
1681 if (ISSET(lflag, ICANON | ISIG))
1687 icc = imin(uio->uio_resid, IBUFSIZ);
1688 icc = q_to_b(qp, ibuf, icc);
1694 error = uiomove(ibuf, icc, uio);
1696 * XXX if there was an error then we should ungetc() the
1697 * unmoved chars and reduce icc here.
1701 if (uio->uio_resid == 0)
1715 * delayed suspend (^Y)
1717 if (CCEQ(cc[VDSUSP], c) &&
1718 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1719 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1721 error = ttysleep(tp, &lbolt, PCATCH,
1730 * Interpret EOF only in canonical mode.
1732 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1735 * Give user character.
1737 error = ureadc(c, uio);
1739 /* XXX should ungetc(c, qp). */
1741 if (uio->uio_resid == 0)
1744 * In canonical mode check for a "break character"
1745 * marking the end of a "line of input".
1747 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1754 * Look to unblock input now that (presumably)
1755 * the input queue has gone down.
1758 if (ISSET(tp->t_state, TS_TBLOCK) &&
1759 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1767 * Check the output queue on tp for space for a kernel message (from uprintf
1768 * or tprintf). Allow some space over the normal hiwater mark so we don't
1769 * lose messages due to normal flow control, but don't let the tty run amok.
1770 * Sleeps here are not interruptible, but we return prematurely if new signals
1774 ttycheckoutq(tp, wait)
1781 hiwat = tp->t_ohiwat;
1782 SIGEMPTYSET(oldmask);
1785 oldmask = curproc->p_siglist;
1786 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1787 while (tp->t_outq.c_cc > hiwat) {
1789 if (tp->t_outq.c_cc <= hiwat)
1791 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1795 SET(tp->t_state, TS_SO_OLOWAT);
1796 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1803 * Process a write call on a tty device.
1806 ttwrite(tp, uio, flag)
1814 int i, hiwat, cnt, error, s;
1817 hiwat = tp->t_ohiwat;
1818 cnt = uio->uio_resid;
1823 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1825 if (uio->uio_resid == cnt)
1829 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1830 if (flag & IO_NDELAY) {
1832 error = EWOULDBLOCK;
1835 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1843 * Hang the process if it's in the background.
1846 if (isbackground(p, tp) &&
1847 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1848 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1849 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1850 if (p->p_pgrp->pg_jobc == 0) {
1854 pgsignal(p->p_pgrp, SIGTTOU, 1);
1855 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1861 * Process the user's data in at most OBUFSIZ chunks. Perform any
1862 * output translation. Keep track of high water mark, sleep on
1863 * overflow awaiting device aid in acquiring new space.
1865 while (uio->uio_resid > 0 || cc > 0) {
1866 if (ISSET(tp->t_lflag, FLUSHO)) {
1870 if (tp->t_outq.c_cc > hiwat)
1873 * Grab a hunk of data from the user, unless we have some
1874 * leftover from last time.
1877 cc = imin(uio->uio_resid, OBUFSIZ);
1879 error = uiomove(cp, cc, uio);
1886 * If nothing fancy need be done, grab those characters we
1887 * can handle without any of ttyoutput's processing and
1888 * just transfer them to the output q. For those chars
1889 * which require special processing (as indicated by the
1890 * bits in char_type), call ttyoutput. After processing
1891 * a hunk of data, look for FLUSHO so ^O's will take effect
1895 if (!ISSET(tp->t_oflag, OPOST))
1898 ce = cc - scanc((u_int)cc, (u_char *)cp,
1899 char_type, CCLASSMASK);
1901 * If ce is zero, then we're processing
1902 * a special character through ttyoutput.
1906 if (ttyoutput(*cp, tp) >= 0) {
1907 /* No Clists, wait a bit. */
1909 if (flag & IO_NDELAY) {
1910 error = EWOULDBLOCK;
1913 error = ttysleep(tp, &lbolt,
1922 if (ISSET(tp->t_lflag, FLUSHO) ||
1923 tp->t_outq.c_cc > hiwat)
1929 * A bunch of normal characters have been found.
1930 * Transfer them en masse to the output queue and
1931 * continue processing at the top of the loop.
1932 * If there are any further characters in this
1933 * <= OBUFSIZ chunk, the first should be a character
1934 * requiring special handling by ttyoutput.
1937 i = b_to_q(cp, ce, &tp->t_outq);
1940 cp += ce, cc -= ce, tk_nout += ce;
1943 /* No Clists, wait a bit. */
1945 if (flag & IO_NDELAY) {
1946 error = EWOULDBLOCK;
1949 error = ttysleep(tp, &lbolt, PCATCH,
1955 if (ISSET(tp->t_lflag, FLUSHO) ||
1956 tp->t_outq.c_cc > hiwat)
1963 * If cc is nonzero, we leave the uio structure inconsistent, as the
1964 * offset and iov pointers have moved forward, but it doesn't matter
1965 * (the call will either return short or restart with a new uio).
1967 uio->uio_resid += cc;
1974 * This can only occur if FLUSHO is set in t_lflag,
1975 * or if ttstart/oproc is synchronous (or very fast).
1977 if (tp->t_outq.c_cc <= hiwat) {
1981 if (flag & IO_NDELAY) {
1983 uio->uio_resid += cc;
1984 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1986 SET(tp->t_state, TS_SO_OLOWAT);
1987 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
1989 if (error == EWOULDBLOCK)
1997 * Rubout one character from the rawq of tp
1998 * as cleanly as possible.
2009 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2011 CLR(tp->t_lflag, FLUSHO);
2012 if (ISSET(tp->t_lflag, ECHOE)) {
2013 if (tp->t_rocount == 0) {
2015 * Screwed by ttwrite; retype
2020 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2023 CLR(c, ~TTY_CHARMASK);
2024 switch (CCLASS(c)) {
2033 if (ISSET(tp->t_lflag, ECHOCTL))
2037 if (tp->t_rocount < tp->t_rawq.c_cc) {
2042 savecol = tp->t_column;
2043 SET(tp->t_state, TS_CNTTB);
2044 SET(tp->t_lflag, FLUSHO);
2045 tp->t_column = tp->t_rocol;
2046 cp = tp->t_rawq.c_cf;
2048 tabc = *cp; /* XXX FIX NEXTC */
2049 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2051 CLR(tp->t_lflag, FLUSHO);
2052 CLR(tp->t_state, TS_CNTTB);
2055 /* savecol will now be length of the tab. */
2056 savecol -= tp->t_column;
2057 tp->t_column += savecol;
2059 savecol = 8; /* overflow screw */
2060 while (--savecol >= 0)
2061 (void)ttyoutput('\b', tp);
2064 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2065 (void)printf(PANICSTR, c, CCLASS(c));
2067 panic(PANICSTR, c, CCLASS(c));
2071 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2072 if (!ISSET(tp->t_state, TS_ERASE)) {
2073 SET(tp->t_state, TS_ERASE);
2074 (void)ttyoutput('\\', tp);
2078 ttyecho(tp->t_cc[VERASE], tp);
2080 * This code may be executed not only when an ERASE key
2081 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2082 * So, I didn't think it was worthwhile to pass the extra
2083 * information (which would need an extra parameter,
2084 * changing every call) needed to distinguish the ERASE2
2085 * case from the ERASE.
2092 * Back over cnt characters, erasing them.
2101 (void)ttyoutput('\b', tp);
2102 (void)ttyoutput(' ', tp);
2103 (void)ttyoutput('\b', tp);
2109 * Reprint the rawq line. Note, it is assumed that c_cc has already
2119 /* Echo the reprint character. */
2120 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2121 ttyecho(tp->t_cc[VREPRINT], tp);
2123 (void)ttyoutput('\n', tp);
2127 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2128 * BIT OF FIRST CHAR.
2131 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2132 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2134 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2135 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2137 CLR(tp->t_state, TS_ERASE);
2140 tp->t_rocount = tp->t_rawq.c_cc;
2145 * Echo a typed character to the terminal.
2153 if (!ISSET(tp->t_state, TS_CNTTB))
2154 CLR(tp->t_lflag, FLUSHO);
2155 if ((!ISSET(tp->t_lflag, ECHO) &&
2156 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2157 ISSET(tp->t_lflag, EXTPROC))
2159 if (ISSET(tp->t_lflag, ECHOCTL) &&
2160 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2161 ISSET(c, TTY_CHARMASK) == 0177)) {
2162 (void)ttyoutput('^', tp);
2163 CLR(c, ~TTY_CHARMASK);
2169 (void)ttyoutput(c, tp);
2173 * Wake up any readers on a tty.
2180 if (tp->t_rsel.si_pid != 0)
2181 selwakeup(&tp->t_rsel);
2182 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2183 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2184 wakeup(TSA_HUP_OR_INPUT(tp));
2185 KNOTE(&tp->t_rsel.si_note, 0);
2189 * Wake up any writers on a tty.
2196 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2197 selwakeup(&tp->t_wsel);
2198 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2199 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2200 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2201 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2202 CLR(tp->t_state, TS_SO_OCOMPLETE);
2203 wakeup(TSA_OCOMPLETE(tp));
2205 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2206 tp->t_outq.c_cc <= tp->t_olowat) {
2207 CLR(tp->t_state, TS_SO_OLOWAT);
2208 wakeup(TSA_OLOWAT(tp));
2210 KNOTE(&tp->t_wsel.si_note, 0);
2214 * Look up a code for a specified speed in a conversion table;
2215 * used by drivers to map software speed values to hardware parameters.
2218 ttspeedtab(speed, table)
2220 struct speedtab *table;
2223 for ( ; table->sp_speed != -1; table++)
2224 if (table->sp_speed == speed)
2225 return (table->sp_code);
2230 * Set input and output watermarks and buffer sizes. For input, the
2231 * high watermark is about one second's worth of input above empty, the
2232 * low watermark is slightly below high water, and the buffer size is a
2233 * driver-dependent amount above high water. For output, the watermarks
2234 * are near the ends of the buffer, with about 1 second's worth of input
2235 * between them. All this only applies to the standard line discipline.
2241 int cps, ttmaxhiwat, x;
2244 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2245 switch (tp->t_ispeedwat) {
2247 cps = tp->t_ispeed / 10;
2251 * This case is for old drivers that don't know about
2252 * t_ispeedwat. Arrange for them to get the old buffer
2253 * sizes and watermarks.
2255 cps = TTYHOG - 2 * 256;
2256 tp->t_ififosize = 2 * 256;
2259 cps = tp->t_ispeedwat / 10;
2263 tp->t_ilowat = 7 * cps / 8;
2264 x = cps + tp->t_ififosize;
2265 clist_alloc_cblocks(&tp->t_rawq, x, x);
2268 switch (tp->t_ospeedwat) {
2270 cps = tp->t_ospeed / 10;
2271 ttmaxhiwat = 2 * TTMAXHIWAT;
2274 cps = tp->t_ospeed / 10;
2275 ttmaxhiwat = TTMAXHIWAT;
2278 cps = tp->t_ospeedwat / 10;
2279 ttmaxhiwat = 8 * TTMAXHIWAT;
2282 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2283 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2285 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2286 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2287 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2289 clist_alloc_cblocks(&tp->t_outq, x, x);
2294 * Report on state of foreground process group.
2300 struct proc *p, *pick;
2301 struct timeval utime, stime;
2304 if (ttycheckoutq(tp,0) == 0)
2307 /* Print load average. */
2308 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2309 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2311 if (tp->t_session == NULL)
2312 ttyprintf(tp, "not a controlling terminal\n");
2313 else if (tp->t_pgrp == NULL)
2314 ttyprintf(tp, "no foreground process group\n");
2315 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0)
2316 ttyprintf(tp, "empty foreground process group\n");
2318 /* Pick interesting process. */
2319 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist))
2320 if (proc_compare(pick, p))
2323 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2324 pick->p_stat == SRUN ? "running" :
2325 pick->p_wmesg ? pick->p_wmesg : "iowait");
2327 if (pick->p_flag & P_INMEM) {
2328 calcru(pick, &utime, &stime, NULL);
2330 /* Print user time. */
2331 ttyprintf(tp, "%ld.%02ldu ",
2332 utime.tv_sec, utime.tv_usec / 10000);
2334 /* Print system time. */
2335 ttyprintf(tp, "%ld.%02lds ",
2336 stime.tv_sec, stime.tv_usec / 10000);
2338 ttyprintf(tp, "?.??u ?.??s ");
2340 /* Print percentage cpu, resident set size. */
2341 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2342 ttyprintf(tp, "%d%% %ldk\n",
2344 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2345 (long)pgtok(vmspace_resident_count(pick->p_vmspace)));
2347 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2351 * Returns 1 if p2 is "better" than p1
2353 * The algorithm for picking the "interesting" process is thus:
2355 * 1) Only foreground processes are eligible - implied.
2356 * 2) Runnable processes are favored over anything else. The runner
2357 * with the highest cpu utilization is picked (p_estcpu). Ties are
2358 * broken by picking the highest pid.
2359 * 3) The sleeper with the shortest sleep time is next. With ties,
2360 * we pick out just "short-term" sleepers (P_SINTR == 0).
2361 * 4) Further ties are broken by picking the highest pid.
2363 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2364 #define TESTAB(a, b) ((a)<<1 | (b))
2370 proc_compare(p1, p2)
2371 struct proc *p1, *p2;
2377 * see if at least one of them is runnable
2379 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2386 * tie - favor one with highest recent cpu utilization
2388 if (p2->p_estcpu > p1->p_estcpu)
2390 if (p1->p_estcpu > p2->p_estcpu)
2392 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2397 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2403 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2406 * pick the one with the smallest sleep time
2408 if (p2->p_slptime > p1->p_slptime)
2410 if (p1->p_slptime > p2->p_slptime)
2413 * favor one sleeping in a non-interruptible sleep
2415 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2417 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2419 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2423 * Output char to tty; console putchar style.
2433 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2438 (void)ttyoutput('\r', tp);
2439 (void)ttyoutput(c, tp);
2446 * Sleep on chan, returning ERESTART if tty changed while we napped and
2447 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2448 * the tty is revoked, restarting a pending call will redo validation done
2449 * at the start of the call.
2452 ttysleep(tp, chan, slpflags, wmesg, timo)
2462 error = tsleep(chan, slpflags, wmesg, timo);
2465 return (tp->t_gen == gen ? 0 : ERESTART);
2469 * Allocate a tty struct. Clists in the struct will be allocated by
2479 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2480 bzero(tp, sizeof *tp);
2485 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2487 * Free a tty struct. Clists in the struct should have been freed by
2502 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2506 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2510 SLIST_FOREACH(tp, &tty_list, t_list) {
2513 t.t_dev = (dev_t)dev2udev(t.t_dev);
2514 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2521 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2522 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2534 ttyread(dev, uio, flag)
2544 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2548 ttywrite(dev, uio, flag)
2558 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));