2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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8 * the permission of UNIX System Laboratories, Inc.
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.3 2003/06/23 17:55:41 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 __P((struct proc *p1, struct proc *p2));
104 static int ttnread __P((struct tty *tp));
105 static void ttyecho __P((int c, struct tty *tp));
106 static int ttyoutput __P((int c, register struct tty *tp));
107 static void ttypend __P((struct tty *tp));
108 static void ttyretype __P((struct tty *tp));
109 static void ttyrub __P((int c, struct tty *tp));
110 static void ttyrubo __P((struct tty *tp, int cnt));
111 static void ttyunblock __P((struct tty *tp));
112 static int ttywflush __P((struct tty *tp));
113 static int filt_ttyread __P((struct knote *kn, long hint));
114 static void filt_ttyrdetach __P((struct knote *kn));
115 static int filt_ttywrite __P((struct knote *kn, long hint));
116 static void filt_ttywdetach __P((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.
210 register struct tty *tp;
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.
237 register struct tty *tp;
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.
277 register struct tty *tp;
279 register 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))
536 * Check for input buffer overflow
538 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
540 if (ISSET(iflag, IMAXBEL)) {
541 if (tp->t_outq.c_cc < tp->t_ohiwat)
542 (void)ttyoutput(CTRL('g'), tp);
547 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
548 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
549 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
552 * Put data char in q for user and
553 * wakeup on seeing a line delimiter.
555 if (putc(c, &tp->t_rawq) >= 0) {
556 if (!ISSET(lflag, ICANON)) {
561 if (TTBREAKC(c, lflag)) {
563 catq(&tp->t_rawq, &tp->t_canq);
565 } else if (tp->t_rocount++ == 0)
566 tp->t_rocol = tp->t_column;
567 if (ISSET(tp->t_state, TS_ERASE)) {
569 * end of prterase \.../
571 CLR(tp->t_state, TS_ERASE);
572 (void)ttyoutput('/', tp);
576 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
578 * Place the cursor over the '^' of the ^D.
580 i = imin(2, tp->t_column - i);
582 (void)ttyoutput('\b', tp);
589 * IXANY means allow any character to restart output.
591 if (ISSET(tp->t_state, TS_TTSTOP) &&
592 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
595 CLR(tp->t_lflag, FLUSHO);
596 CLR(tp->t_state, TS_TTSTOP);
598 return (ttstart(tp));
602 * Output a single character on a tty, doing output processing
603 * as needed (expanding tabs, newline processing, etc.).
604 * Returns < 0 if succeeds, otherwise returns char to resend.
610 register struct tty *tp;
612 register tcflag_t oflag;
616 if (!ISSET(oflag, OPOST)) {
617 if (ISSET(tp->t_lflag, FLUSHO))
619 if (putc(c, &tp->t_outq))
626 * Do tab expansion if OXTABS is set. Special case if we external
627 * processing, we don't do the tab expansion because we'll probably
628 * get it wrong. If tab expansion needs to be done, let it happen
631 CLR(c, ~TTY_CHARMASK);
633 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
634 c = 8 - (tp->t_column & 7);
635 if (!ISSET(tp->t_lflag, FLUSHO)) {
636 s = spltty(); /* Don't interrupt tabs. */
637 c -= b_to_q(" ", c, &tp->t_outq);
643 return (c ? -1 : '\t');
645 if (c == CEOT && ISSET(oflag, ONOEOT))
649 * Newline translation: if ONLCR is set,
650 * translate newline into "\r\n".
652 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
655 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
658 /* If OCRNL is set, translate "\r" into "\n". */
659 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
661 /* If ONOCR is set, don't transmit CRs when on column 0. */
662 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
667 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
679 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
689 col = (col + 8) & ~7;
697 * Ioctls for all tty devices. Called after line-discipline specific ioctl
698 * has been called to do discipline-specific functions and/or reject any
699 * of these ioctl commands.
703 ttioctl(tp, cmd, data, flag)
709 struct proc *p = curproc;
712 /* If the ioctl involves modification, hang if in the background. */
736 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
746 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
747 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
748 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
749 if (p->p_pgrp->pg_jobc == 0)
751 pgsignal(p->p_pgrp, SIGTTOU, 1);
752 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
760 switch (cmd) { /* Process the ioctl. */
761 case FIOASYNC: /* set/clear async i/o */
764 SET(tp->t_state, TS_ASYNC);
766 CLR(tp->t_state, TS_ASYNC);
769 case FIONBIO: /* set/clear non-blocking i/o */
770 break; /* XXX: delete. */
771 case FIONREAD: /* get # bytes to read */
773 *(int *)data = ttnread(tp);
779 * Policy -- Don't allow FIOSETOWN on someone else's
782 if (tp->t_session != NULL && !isctty(p, tp))
785 error = fsetown(*(int *)data, &tp->t_sigio);
790 if (tp->t_session != NULL && !isctty(p, tp))
792 *(int *)data = fgetown(tp->t_sigio);
795 case TIOCEXCL: /* set exclusive use of tty */
797 SET(tp->t_state, TS_XCLUDE);
800 case TIOCFLUSH: { /* flush buffers */
801 register int flags = *(int *)data;
804 flags = FREAD | FWRITE;
806 flags &= FREAD | FWRITE;
810 case TIOCCONS: /* become virtual console */
812 if (constty && constty != tp &&
813 ISSET(constty->t_state, TS_CONNECTED))
816 if ((error = suser()) != 0)
820 } else if (tp == constty)
823 case TIOCDRAIN: /* wait till output drained */
828 case TIOCGETA: { /* get termios struct */
829 struct termios *t = (struct termios *)data;
831 bcopy(&tp->t_termios, t, sizeof(struct termios));
834 case TIOCGETD: /* get line discipline */
835 *(int *)data = tp->t_line;
837 case TIOCGWINSZ: /* get window size */
838 *(struct winsize *)data = tp->t_winsize;
840 case TIOCGPGRP: /* get pgrp of tty */
843 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
846 case TIOCHPCL: /* hang up on last close */
848 SET(tp->t_cflag, HUPCL);
852 case TIOCNXCL: /* reset exclusive use of tty */
854 CLR(tp->t_state, TS_XCLUDE);
857 case TIOCOUTQ: /* output queue size */
858 *(int *)data = tp->t_outq.c_cc;
860 case TIOCSETA: /* set termios struct */
861 case TIOCSETAW: /* drain output, set */
862 case TIOCSETAF: { /* drn out, fls in, set */
863 register struct termios *t = (struct termios *)data;
865 if (t->c_ispeed == 0)
866 t->c_ispeed = t->c_ospeed;
867 if (t->c_ispeed == 0)
868 t->c_ispeed = tp->t_ospeed;
869 if (t->c_ispeed == 0)
872 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
878 if (cmd == TIOCSETAF)
881 if (!ISSET(t->c_cflag, CIGNORE)) {
883 * Set device hardware.
885 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
889 if (ISSET(t->c_cflag, CLOCAL) &&
890 !ISSET(tp->t_cflag, CLOCAL)) {
892 * XXX disconnections would be too hard to
893 * get rid of without this kludge. The only
894 * way to get rid of controlling terminals
895 * is to exit from the session leader.
897 CLR(tp->t_state, TS_ZOMBIE);
899 wakeup(TSA_CARR_ON(tp));
903 if ((ISSET(tp->t_state, TS_CARR_ON) ||
904 ISSET(t->c_cflag, CLOCAL)) &&
905 !ISSET(tp->t_state, TS_ZOMBIE))
906 SET(tp->t_state, TS_CONNECTED);
908 CLR(tp->t_state, TS_CONNECTED);
909 tp->t_cflag = t->c_cflag;
910 tp->t_ispeed = t->c_ispeed;
911 if (t->c_ospeed != 0)
912 tp->t_ospeed = t->c_ospeed;
915 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
917 if (ISSET(t->c_lflag, ICANON))
918 SET(tp->t_lflag, PENDIN);
921 * XXX we really shouldn't allow toggling
922 * ICANON while we're in a non-termios line
923 * discipline. Now we have to worry about
924 * panicing for a null queue.
926 if (tp->t_canq.c_cbreserved > 0 &&
927 tp->t_rawq.c_cbreserved > 0) {
928 catq(&tp->t_rawq, &tp->t_canq);
930 * XXX the queue limits may be
931 * different, so the old queue
932 * swapping method no longer works.
934 catq(&tp->t_canq, &tp->t_rawq);
936 CLR(tp->t_lflag, PENDIN);
940 tp->t_iflag = t->c_iflag;
941 tp->t_oflag = t->c_oflag;
943 * Make the EXTPROC bit read only.
945 if (ISSET(tp->t_lflag, EXTPROC))
946 SET(t->c_lflag, EXTPROC);
948 CLR(t->c_lflag, EXTPROC);
949 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
950 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
951 t->c_cc[VTIME] != tp->t_cc[VTIME])
953 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
957 case TIOCSETD: { /* set line discipline */
958 register int t = *(int *)data;
959 dev_t device = tp->t_dev;
961 if ((u_int)t >= nlinesw)
963 if (t != tp->t_line) {
965 (*linesw[tp->t_line].l_close)(tp, flag);
966 error = (*linesw[t].l_open)(device, tp);
968 (void)(*linesw[tp->t_line].l_open)(device, tp);
977 case TIOCSTART: /* start output, like ^Q */
979 if (ISSET(tp->t_state, TS_TTSTOP) ||
980 ISSET(tp->t_lflag, FLUSHO)) {
981 CLR(tp->t_lflag, FLUSHO);
982 CLR(tp->t_state, TS_TTSTOP);
987 case TIOCSTI: /* simulate terminal input */
988 if ((flag & FREAD) == 0 && suser())
990 if (!isctty(p, tp) && suser())
993 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
996 case TIOCSTOP: /* stop output, like ^S */
998 if (!ISSET(tp->t_state, TS_TTSTOP)) {
999 SET(tp->t_state, TS_TTSTOP);
1000 (*tp->t_stop)(tp, 0);
1004 case TIOCSCTTY: /* become controlling tty */
1005 /* Session ctty vnode pointer set in vnode layer. */
1006 if (!SESS_LEADER(p) ||
1007 ((p->p_session->s_ttyvp || tp->t_session) &&
1008 (tp->t_session != p->p_session)))
1010 tp->t_session = p->p_session;
1011 tp->t_pgrp = p->p_pgrp;
1012 p->p_session->s_ttyp = tp;
1013 p->p_flag |= P_CONTROLT;
1015 case TIOCSPGRP: { /* set pgrp of tty */
1016 register struct pgrp *pgrp = pgfind(*(int *)data);
1020 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1025 case TIOCSTAT: /* simulate control-T */
1030 case TIOCSWINSZ: /* set window size */
1031 if (bcmp((caddr_t)&tp->t_winsize, data,
1032 sizeof (struct winsize))) {
1033 tp->t_winsize = *(struct winsize *)data;
1034 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1037 case TIOCSDRAINWAIT:
1041 tp->t_timeout = *(int *)data * hz;
1042 wakeup(TSA_OCOMPLETE(tp));
1043 wakeup(TSA_OLOWAT(tp));
1045 case TIOCGDRAINWAIT:
1046 *(int *)data = tp->t_timeout / hz;
1049 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1050 return (ttcompat(tp, cmd, data, flag));
1059 ttypoll(dev, events, td)
1069 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1070 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1074 if (events & (POLLIN | POLLRDNORM)) {
1075 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1076 revents |= events & (POLLIN | POLLRDNORM);
1078 selrecord(td, &tp->t_rsel);
1080 if (events & (POLLOUT | POLLWRNORM)) {
1081 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1082 ISSET(tp->t_state, TS_CONNECTED))
1083 || ISSET(tp->t_state, TS_ZOMBIE))
1084 revents |= events & (POLLOUT | POLLWRNORM);
1086 selrecord(td, &tp->t_wsel);
1092 static struct filterops ttyread_filtops =
1093 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1094 static struct filterops ttywrite_filtops =
1095 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1098 ttykqfilter(dev, kn)
1102 struct tty *tp = dev->si_tty;
1103 struct klist *klist;
1106 switch (kn->kn_filter) {
1108 klist = &tp->t_rsel.si_note;
1109 kn->kn_fop = &ttyread_filtops;
1112 klist = &tp->t_wsel.si_note;
1113 kn->kn_fop = &ttywrite_filtops;
1119 kn->kn_hook = (caddr_t)dev;
1122 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1129 filt_ttyrdetach(struct knote *kn)
1131 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1134 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1139 filt_ttyread(struct knote *kn, long hint)
1141 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1143 kn->kn_data = ttnread(tp);
1144 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1145 kn->kn_flags |= EV_EOF;
1148 return (kn->kn_data > 0);
1152 filt_ttywdetach(struct knote *kn)
1154 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1157 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1162 filt_ttywrite(kn, hint)
1166 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1168 kn->kn_data = tp->t_outq.c_cc;
1169 if (ISSET(tp->t_state, TS_ZOMBIE))
1171 return (kn->kn_data <= tp->t_olowat &&
1172 ISSET(tp->t_state, TS_CONNECTED));
1176 * Must be called at spltty().
1184 if (ISSET(tp->t_lflag, PENDIN))
1186 nread = tp->t_canq.c_cc;
1187 if (!ISSET(tp->t_lflag, ICANON)) {
1188 nread += tp->t_rawq.c_cc;
1189 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1196 * Wait for output to drain.
1200 register struct tty *tp;
1206 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1207 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1209 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1210 ISSET(tp->t_state, TS_CONNECTED)) {
1211 SET(tp->t_state, TS_SO_OCOMPLETE);
1212 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1213 TTOPRI | PCATCH, "ttywai",
1216 if (error == EWOULDBLOCK)
1223 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1230 * Flush if successfully wait.
1238 if ((error = ttywait(tp)) == 0)
1239 ttyflush(tp, FREAD);
1244 * Flush tty read and/or write queues, notifying anyone waiting.
1248 register struct tty *tp;
1258 FLUSHQ(&tp->t_outq);
1259 CLR(tp->t_state, TS_TTSTOP);
1261 (*tp->t_stop)(tp, rw);
1263 FLUSHQ(&tp->t_canq);
1264 FLUSHQ(&tp->t_rawq);
1265 CLR(tp->t_lflag, PENDIN);
1268 CLR(tp->t_state, TS_LOCAL);
1270 if (ISSET(tp->t_state, TS_TBLOCK)) {
1272 FLUSHQ(&tp->t_outq);
1276 * Don't let leave any state that might clobber the
1277 * next line discipline (although we should do more
1278 * to send the START char). Not clearing the state
1279 * may have caused the "putc to a clist with no
1280 * reserved cblocks" panic/printf.
1282 CLR(tp->t_state, TS_TBLOCK);
1284 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1285 if (ISSET(tp->t_iflag, IXOFF)) {
1287 * XXX wait a bit in the hope that the stop
1288 * character (if any) will go out. Waiting
1289 * isn't good since it allows races. This
1290 * will be fixed when the stop character is
1291 * put in a special queue. Don't bother with
1292 * the checks in ttywait() since the timeout
1295 SET(tp->t_state, TS_SO_OCOMPLETE);
1296 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1299 * Don't try sending the stop character again.
1301 CLR(tp->t_state, TS_TBLOCK);
1308 FLUSHQ(&tp->t_outq);
1315 * Copy in the default termios characters.
1322 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1333 termioschars(&tp->t_termios);
1337 * Handle input high water. Send stop character for the IXOFF case. Turn
1338 * on our input flow control bit and propagate the changes to the driver.
1339 * XXX the stop character should be put in a special high priority queue.
1346 SET(tp->t_state, TS_TBLOCK);
1347 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1348 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1349 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1354 * Handle input low water. Send start character for the IXOFF case. Turn
1355 * off our input flow control bit and propagate the changes to the driver.
1356 * XXX the start character should be put in a special high priority queue.
1363 CLR(tp->t_state, TS_TBLOCK);
1364 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1365 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1366 SET(tp->t_state, TS_TBLOCK); /* try again later */
1371 /* Not used by any current (i386) drivers. */
1373 * Restart after an inter-char delay.
1382 KASSERT(tp_arg != NULL, ("ttrstrt"));
1387 CLR(tp->t_state, TS_TIMEOUT);
1399 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1405 * "close" a line discipline
1413 if (flag & FNONBLOCK || ttywflush(tp))
1414 ttyflush(tp, FREAD | FWRITE);
1419 * Handle modem control transition on a tty.
1420 * Flag indicates new state of carrier.
1421 * Returns 0 if the line should be turned off, otherwise 1.
1425 register struct tty *tp;
1429 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1431 * MDMBUF: do flow control according to carrier flag
1432 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1433 * works if IXON and IXANY are clear.
1436 CLR(tp->t_state, TS_CAR_OFLOW);
1437 CLR(tp->t_state, TS_TTSTOP);
1439 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1440 SET(tp->t_state, TS_CAR_OFLOW);
1441 SET(tp->t_state, TS_TTSTOP);
1442 (*tp->t_stop)(tp, 0);
1444 } else if (flag == 0) {
1448 CLR(tp->t_state, TS_CARR_ON);
1449 if (ISSET(tp->t_state, TS_ISOPEN) &&
1450 !ISSET(tp->t_cflag, CLOCAL)) {
1451 SET(tp->t_state, TS_ZOMBIE);
1452 CLR(tp->t_state, TS_CONNECTED);
1453 if (tp->t_session && tp->t_session->s_leader)
1454 psignal(tp->t_session->s_leader, SIGHUP);
1455 ttyflush(tp, FREAD | FWRITE);
1462 SET(tp->t_state, TS_CARR_ON);
1463 if (!ISSET(tp->t_state, TS_ZOMBIE))
1464 SET(tp->t_state, TS_CONNECTED);
1465 wakeup(TSA_CARR_ON(tp));
1473 * Reinput pending characters after state switch
1478 register struct tty *tp;
1483 CLR(tp->t_lflag, PENDIN);
1484 SET(tp->t_state, TS_TYPEN);
1486 * XXX this assumes too much about clist internals. It may even
1487 * fail if the cblock slush pool is empty. We can't allocate more
1488 * cblocks here because we are called from an interrupt handler
1489 * and clist_alloc_cblocks() can wait.
1492 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1493 tp->t_rawq.c_cbmax = tq.c_cbmax;
1494 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1495 while ((c = getc(&tq)) >= 0)
1497 CLR(tp->t_state, TS_TYPEN);
1501 * Process a read call on a tty device.
1504 ttread(tp, uio, flag)
1505 register struct tty *tp;
1509 register struct clist *qp;
1511 register tcflag_t lflag;
1512 register cc_t *cc = tp->t_cc;
1513 register struct proc *p = curproc;
1514 int s, first, error = 0;
1515 int has_stime = 0, last_cc = 0;
1516 long slp = 0; /* XXX this should be renamed `timo'. */
1517 struct timeval stime;
1521 lflag = tp->t_lflag;
1523 * take pending input first
1525 if (ISSET(lflag, PENDIN)) {
1527 splx(s); /* reduce latency */
1529 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1533 * Hang process if it's in the background.
1535 if (isbackground(p, tp)) {
1537 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1538 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1539 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1541 pgsignal(p->p_pgrp, SIGTTIN, 1);
1542 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1548 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1550 return (0); /* EOF */
1554 * If canonical, use the canonical queue,
1555 * else use the raw queue.
1557 * (should get rid of clists...)
1559 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1561 if (flag & IO_NDELAY) {
1564 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1569 return (EWOULDBLOCK);
1571 if (!ISSET(lflag, ICANON)) {
1574 struct timeval timecopy;
1577 * Check each of the four combinations.
1578 * (m > 0 && t == 0) is the normal read case.
1579 * It should be fairly efficient, so we check that and its
1580 * companion case (m == 0 && t == 0) first.
1581 * For the other two cases, we compute the target sleep time
1590 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1594 t *= 100000; /* time in us */
1595 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1596 ((t1).tv_usec - (t2).tv_usec))
1602 getmicrotime(&timecopy);
1604 /* first character, start timer */
1608 } else if (qp->c_cc > last_cc) {
1609 /* got a character, restart timer */
1613 /* nothing, check expiration */
1614 slp = t - diff(timecopy, stime);
1619 } else { /* m == 0 */
1622 getmicrotime(&timecopy);
1628 slp = t - diff(timecopy, stime);
1630 /* Timed out, but 0 is enough input. */
1638 * Rounding down may make us wake up just short
1639 * of the target, so we round up.
1640 * The formula is ceiling(slp * hz/1000000).
1641 * 32-bit arithmetic is enough for hz < 169.
1642 * XXX see tvtohz() for how to avoid overflow if hz
1643 * is large (divide by `tick' and/or arrange to
1644 * use tvtohz() if hz is large).
1646 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1649 if (qp->c_cc <= 0) {
1652 * There is no input, or not enough input and we can block.
1654 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1655 ISSET(tp->t_state, TS_CONNECTED) ?
1656 "ttyin" : "ttyhup", (int)slp);
1658 if (error == EWOULDBLOCK)
1663 * XXX what happens if another process eats some input
1664 * while we are asleep (not just here)? It would be
1665 * safest to detect changes and reset our state variables
1666 * (has_stime and last_cc).
1674 * Input present, check for input mapping and processing.
1677 if (ISSET(lflag, ICANON | ISIG))
1683 icc = imin(uio->uio_resid, IBUFSIZ);
1684 icc = q_to_b(qp, ibuf, icc);
1690 error = uiomove(ibuf, icc, uio);
1692 * XXX if there was an error then we should ungetc() the
1693 * unmoved chars and reduce icc here.
1697 if (uio->uio_resid == 0)
1711 * delayed suspend (^Y)
1713 if (CCEQ(cc[VDSUSP], c) &&
1714 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1715 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1717 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1726 * Interpret EOF only in canonical mode.
1728 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1731 * Give user character.
1733 error = ureadc(c, uio);
1735 /* XXX should ungetc(c, qp). */
1737 if (uio->uio_resid == 0)
1740 * In canonical mode check for a "break character"
1741 * marking the end of a "line of input".
1743 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1750 * Look to unblock input now that (presumably)
1751 * the input queue has gone down.
1754 if (ISSET(tp->t_state, TS_TBLOCK) &&
1755 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1763 * Check the output queue on tp for space for a kernel message (from uprintf
1764 * or tprintf). Allow some space over the normal hiwater mark so we don't
1765 * lose messages due to normal flow control, but don't let the tty run amok.
1766 * Sleeps here are not interruptible, but we return prematurely if new signals
1770 ttycheckoutq(tp, wait)
1771 register struct tty *tp;
1777 hiwat = tp->t_ohiwat;
1778 SIGEMPTYSET(oldmask);
1781 oldmask = curproc->p_siglist;
1782 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1783 while (tp->t_outq.c_cc > hiwat) {
1785 if (tp->t_outq.c_cc <= hiwat)
1787 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1791 SET(tp->t_state, TS_SO_OLOWAT);
1792 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1799 * Process a write call on a tty device.
1802 ttwrite(tp, uio, flag)
1803 register struct tty *tp;
1804 register struct uio *uio;
1807 register char *cp = NULL;
1808 register int cc, ce;
1809 register struct proc *p;
1810 int i, hiwat, cnt, error, s;
1813 hiwat = tp->t_ohiwat;
1814 cnt = uio->uio_resid;
1819 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1821 if (uio->uio_resid == cnt)
1825 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1826 if (flag & IO_NDELAY) {
1828 error = EWOULDBLOCK;
1831 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1840 * Hang the process if it's in the background.
1843 if (isbackground(p, tp) &&
1844 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1845 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1846 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1847 if (p->p_pgrp->pg_jobc == 0) {
1851 pgsignal(p->p_pgrp, SIGTTOU, 1);
1852 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1858 * Process the user's data in at most OBUFSIZ chunks. Perform any
1859 * output translation. Keep track of high water mark, sleep on
1860 * overflow awaiting device aid in acquiring new space.
1862 while (uio->uio_resid > 0 || cc > 0) {
1863 if (ISSET(tp->t_lflag, FLUSHO)) {
1867 if (tp->t_outq.c_cc > hiwat)
1870 * Grab a hunk of data from the user, unless we have some
1871 * leftover from last time.
1874 cc = imin(uio->uio_resid, OBUFSIZ);
1876 error = uiomove(cp, cc, uio);
1883 * If nothing fancy need be done, grab those characters we
1884 * can handle without any of ttyoutput's processing and
1885 * just transfer them to the output q. For those chars
1886 * which require special processing (as indicated by the
1887 * bits in char_type), call ttyoutput. After processing
1888 * a hunk of data, look for FLUSHO so ^O's will take effect
1892 if (!ISSET(tp->t_oflag, OPOST))
1895 ce = cc - scanc((u_int)cc, (u_char *)cp,
1896 char_type, CCLASSMASK);
1898 * If ce is zero, then we're processing
1899 * a special character through ttyoutput.
1903 if (ttyoutput(*cp, tp) >= 0) {
1904 /* No Clists, wait a bit. */
1906 if (flag & IO_NDELAY) {
1907 error = EWOULDBLOCK;
1910 error = ttysleep(tp, &lbolt,
1919 if (ISSET(tp->t_lflag, FLUSHO) ||
1920 tp->t_outq.c_cc > hiwat)
1926 * A bunch of normal characters have been found.
1927 * Transfer them en masse to the output queue and
1928 * continue processing at the top of the loop.
1929 * If there are any further characters in this
1930 * <= OBUFSIZ chunk, the first should be a character
1931 * requiring special handling by ttyoutput.
1934 i = b_to_q(cp, ce, &tp->t_outq);
1937 cp += ce, cc -= ce, tk_nout += ce;
1940 /* No Clists, wait a bit. */
1942 if (flag & IO_NDELAY) {
1943 error = EWOULDBLOCK;
1946 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1952 if (ISSET(tp->t_lflag, FLUSHO) ||
1953 tp->t_outq.c_cc > hiwat)
1960 * If cc is nonzero, we leave the uio structure inconsistent, as the
1961 * offset and iov pointers have moved forward, but it doesn't matter
1962 * (the call will either return short or restart with a new uio).
1964 uio->uio_resid += cc;
1971 * This can only occur if FLUSHO is set in t_lflag,
1972 * or if ttstart/oproc is synchronous (or very fast).
1974 if (tp->t_outq.c_cc <= hiwat) {
1978 if (flag & IO_NDELAY) {
1980 uio->uio_resid += cc;
1981 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1983 SET(tp->t_state, TS_SO_OLOWAT);
1984 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1987 if (error == EWOULDBLOCK)
1995 * Rubout one character from the rawq of tp
1996 * as cleanly as possible.
2001 register struct tty *tp;
2004 register int savecol;
2007 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2009 CLR(tp->t_lflag, FLUSHO);
2010 if (ISSET(tp->t_lflag, ECHOE)) {
2011 if (tp->t_rocount == 0) {
2013 * Screwed by ttwrite; retype
2018 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2021 CLR(c, ~TTY_CHARMASK);
2022 switch (CCLASS(c)) {
2031 if (ISSET(tp->t_lflag, ECHOCTL))
2035 if (tp->t_rocount < tp->t_rawq.c_cc) {
2040 savecol = tp->t_column;
2041 SET(tp->t_state, TS_CNTTB);
2042 SET(tp->t_lflag, FLUSHO);
2043 tp->t_column = tp->t_rocol;
2044 cp = tp->t_rawq.c_cf;
2046 tabc = *cp; /* XXX FIX NEXTC */
2047 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2049 CLR(tp->t_lflag, FLUSHO);
2050 CLR(tp->t_state, TS_CNTTB);
2053 /* savecol will now be length of the tab. */
2054 savecol -= tp->t_column;
2055 tp->t_column += savecol;
2057 savecol = 8; /* overflow screw */
2058 while (--savecol >= 0)
2059 (void)ttyoutput('\b', tp);
2062 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2063 (void)printf(PANICSTR, c, CCLASS(c));
2065 panic(PANICSTR, c, CCLASS(c));
2069 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2070 if (!ISSET(tp->t_state, TS_ERASE)) {
2071 SET(tp->t_state, TS_ERASE);
2072 (void)ttyoutput('\\', tp);
2076 ttyecho(tp->t_cc[VERASE], tp);
2078 * This code may be executed not only when an ERASE key
2079 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2080 * So, I didn't think it was worthwhile to pass the extra
2081 * information (which would need an extra parameter,
2082 * changing every call) needed to distinguish the ERASE2
2083 * case from the ERASE.
2090 * Back over cnt characters, erasing them.
2094 register struct tty *tp;
2099 (void)ttyoutput('\b', tp);
2100 (void)ttyoutput(' ', tp);
2101 (void)ttyoutput('\b', tp);
2107 * Reprint the rawq line. Note, it is assumed that c_cc has already
2112 register struct tty *tp;
2117 /* Echo the reprint character. */
2118 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2119 ttyecho(tp->t_cc[VREPRINT], tp);
2121 (void)ttyoutput('\n', tp);
2125 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2126 * BIT OF FIRST CHAR.
2129 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2130 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2132 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2133 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2135 CLR(tp->t_state, TS_ERASE);
2138 tp->t_rocount = tp->t_rawq.c_cc;
2143 * Echo a typed character to the terminal.
2148 register struct tty *tp;
2151 if (!ISSET(tp->t_state, TS_CNTTB))
2152 CLR(tp->t_lflag, FLUSHO);
2153 if ((!ISSET(tp->t_lflag, ECHO) &&
2154 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2155 ISSET(tp->t_lflag, EXTPROC))
2157 if (ISSET(tp->t_lflag, ECHOCTL) &&
2158 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2159 ISSET(c, TTY_CHARMASK) == 0177)) {
2160 (void)ttyoutput('^', tp);
2161 CLR(c, ~TTY_CHARMASK);
2167 (void)ttyoutput(c, tp);
2171 * Wake up any readers on a tty.
2175 register struct tty *tp;
2178 if (tp->t_rsel.si_pid != 0)
2179 selwakeup(&tp->t_rsel);
2180 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2181 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2182 wakeup(TSA_HUP_OR_INPUT(tp));
2183 KNOTE(&tp->t_rsel.si_note, 0);
2187 * Wake up any writers on a tty.
2191 register struct tty *tp;
2194 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2195 selwakeup(&tp->t_wsel);
2196 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2197 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2198 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2199 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2200 CLR(tp->t_state, TS_SO_OCOMPLETE);
2201 wakeup(TSA_OCOMPLETE(tp));
2203 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2204 tp->t_outq.c_cc <= tp->t_olowat) {
2205 CLR(tp->t_state, TS_SO_OLOWAT);
2206 wakeup(TSA_OLOWAT(tp));
2208 KNOTE(&tp->t_wsel.si_note, 0);
2212 * Look up a code for a specified speed in a conversion table;
2213 * used by drivers to map software speed values to hardware parameters.
2216 ttspeedtab(speed, table)
2218 register struct speedtab *table;
2221 for ( ; table->sp_speed != -1; table++)
2222 if (table->sp_speed == speed)
2223 return (table->sp_code);
2228 * Set input and output watermarks and buffer sizes. For input, the
2229 * high watermark is about one second's worth of input above empty, the
2230 * low watermark is slightly below high water, and the buffer size is a
2231 * driver-dependent amount above high water. For output, the watermarks
2232 * are near the ends of the buffer, with about 1 second's worth of input
2233 * between them. All this only applies to the standard line discipline.
2239 register int cps, ttmaxhiwat, x;
2242 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2243 switch (tp->t_ispeedwat) {
2245 cps = tp->t_ispeed / 10;
2249 * This case is for old drivers that don't know about
2250 * t_ispeedwat. Arrange for them to get the old buffer
2251 * sizes and watermarks.
2253 cps = TTYHOG - 2 * 256;
2254 tp->t_ififosize = 2 * 256;
2257 cps = tp->t_ispeedwat / 10;
2261 tp->t_ilowat = 7 * cps / 8;
2262 x = cps + tp->t_ififosize;
2263 clist_alloc_cblocks(&tp->t_rawq, x, x);
2266 switch (tp->t_ospeedwat) {
2268 cps = tp->t_ospeed / 10;
2269 ttmaxhiwat = 2 * TTMAXHIWAT;
2272 cps = tp->t_ospeed / 10;
2273 ttmaxhiwat = TTMAXHIWAT;
2276 cps = tp->t_ospeedwat / 10;
2277 ttmaxhiwat = 8 * TTMAXHIWAT;
2280 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2281 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2283 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2284 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2285 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2287 clist_alloc_cblocks(&tp->t_outq, x, x);
2292 * Report on state of foreground process group.
2296 register struct tty *tp;
2298 register struct proc *p, *pick;
2299 struct timeval utime, stime;
2302 if (ttycheckoutq(tp,0) == 0)
2305 /* Print load average. */
2306 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2307 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2309 if (tp->t_session == NULL)
2310 ttyprintf(tp, "not a controlling terminal\n");
2311 else if (tp->t_pgrp == NULL)
2312 ttyprintf(tp, "no foreground process group\n");
2313 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0)
2314 ttyprintf(tp, "empty foreground process group\n");
2316 /* Pick interesting process. */
2317 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist))
2318 if (proc_compare(pick, p))
2321 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2322 pick->p_stat == SRUN ? "running" :
2323 pick->p_wmesg ? pick->p_wmesg : "iowait");
2325 if (pick->p_flag & P_INMEM) {
2326 calcru(pick, &utime, &stime, NULL);
2328 /* Print user time. */
2329 ttyprintf(tp, "%ld.%02ldu ",
2330 utime.tv_sec, utime.tv_usec / 10000);
2332 /* Print system time. */
2333 ttyprintf(tp, "%ld.%02lds ",
2334 stime.tv_sec, stime.tv_usec / 10000);
2336 ttyprintf(tp, "?.??u ?.??s ");
2338 /* Print percentage cpu, resident set size. */
2339 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2340 ttyprintf(tp, "%d%% %ldk\n",
2342 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2343 (long)pgtok(vmspace_resident_count(pick->p_vmspace)));
2345 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2349 * Returns 1 if p2 is "better" than p1
2351 * The algorithm for picking the "interesting" process is thus:
2353 * 1) Only foreground processes are eligible - implied.
2354 * 2) Runnable processes are favored over anything else. The runner
2355 * with the highest cpu utilization is picked (p_estcpu). Ties are
2356 * broken by picking the highest pid.
2357 * 3) The sleeper with the shortest sleep time is next. With ties,
2358 * we pick out just "short-term" sleepers (P_SINTR == 0).
2359 * 4) Further ties are broken by picking the highest pid.
2361 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2362 #define TESTAB(a, b) ((a)<<1 | (b))
2368 proc_compare(p1, p2)
2369 register struct proc *p1, *p2;
2375 * see if at least one of them is runnable
2377 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2384 * tie - favor one with highest recent cpu utilization
2386 if (p2->p_estcpu > p1->p_estcpu)
2388 if (p1->p_estcpu > p2->p_estcpu)
2390 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2395 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2401 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2404 * pick the one with the smallest sleep time
2406 if (p2->p_slptime > p1->p_slptime)
2408 if (p1->p_slptime > p2->p_slptime)
2411 * favor one sleeping in a non-interruptible sleep
2413 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2415 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2417 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2421 * Output char to tty; console putchar style.
2431 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2436 (void)ttyoutput('\r', tp);
2437 (void)ttyoutput(c, tp);
2444 * Sleep on chan, returning ERESTART if tty changed while we napped and
2445 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2446 * the tty is revoked, restarting a pending call will redo validation done
2447 * at the start of the call.
2450 ttysleep(tp, chan, pri, wmesg, timo)
2460 error = tsleep(chan, pri, wmesg, timo);
2463 return (tp->t_gen == gen ? 0 : ERESTART);
2467 * Allocate a tty struct. Clists in the struct will be allocated by
2477 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2478 bzero(tp, sizeof *tp);
2483 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2485 * Free a tty struct. Clists in the struct should have been freed by
2500 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2504 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2508 SLIST_FOREACH(tp, &tty_list, t_list) {
2511 t.t_dev = (dev_t)dev2udev(t.t_dev);
2512 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2519 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2520 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2532 ttyread(dev, uio, flag)
2542 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2546 ttywrite(dev, uio, flag)
2556 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));