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
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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 1.2 2003/06/17 04:28:41 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)
704 register struct tty *tp;
709 register struct proc *p;
712 p = curproc; /* XXX */
714 /* If the ioctl involves modification, hang if in the background. */
738 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
748 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
749 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
750 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
751 if (p->p_pgrp->pg_jobc == 0)
753 pgsignal(p->p_pgrp, SIGTTOU, 1);
754 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
762 switch (cmd) { /* Process the ioctl. */
763 case FIOASYNC: /* set/clear async i/o */
766 SET(tp->t_state, TS_ASYNC);
768 CLR(tp->t_state, TS_ASYNC);
771 case FIONBIO: /* set/clear non-blocking i/o */
772 break; /* XXX: delete. */
773 case FIONREAD: /* get # bytes to read */
775 *(int *)data = ttnread(tp);
781 * Policy -- Don't allow FIOSETOWN on someone else's
784 if (tp->t_session != NULL && !isctty(p, tp))
787 error = fsetown(*(int *)data, &tp->t_sigio);
792 if (tp->t_session != NULL && !isctty(p, tp))
794 *(int *)data = fgetown(tp->t_sigio);
797 case TIOCEXCL: /* set exclusive use of tty */
799 SET(tp->t_state, TS_XCLUDE);
802 case TIOCFLUSH: { /* flush buffers */
803 register int flags = *(int *)data;
806 flags = FREAD | FWRITE;
808 flags &= FREAD | FWRITE;
812 case TIOCCONS: /* become virtual console */
814 if (constty && constty != tp &&
815 ISSET(constty->t_state, TS_CONNECTED))
818 if ((error = suser(p)) != 0)
822 } else if (tp == constty)
825 case TIOCDRAIN: /* wait till output drained */
830 case TIOCGETA: { /* get termios struct */
831 struct termios *t = (struct termios *)data;
833 bcopy(&tp->t_termios, t, sizeof(struct termios));
836 case TIOCGETD: /* get line discipline */
837 *(int *)data = tp->t_line;
839 case TIOCGWINSZ: /* get window size */
840 *(struct winsize *)data = tp->t_winsize;
842 case TIOCGPGRP: /* get pgrp of tty */
845 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
848 case TIOCHPCL: /* hang up on last close */
850 SET(tp->t_cflag, HUPCL);
854 case TIOCNXCL: /* reset exclusive use of tty */
856 CLR(tp->t_state, TS_XCLUDE);
859 case TIOCOUTQ: /* output queue size */
860 *(int *)data = tp->t_outq.c_cc;
862 case TIOCSETA: /* set termios struct */
863 case TIOCSETAW: /* drain output, set */
864 case TIOCSETAF: { /* drn out, fls in, set */
865 register struct termios *t = (struct termios *)data;
867 if (t->c_ispeed == 0)
868 t->c_ispeed = t->c_ospeed;
869 if (t->c_ispeed == 0)
870 t->c_ispeed = tp->t_ospeed;
871 if (t->c_ispeed == 0)
874 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
880 if (cmd == TIOCSETAF)
883 if (!ISSET(t->c_cflag, CIGNORE)) {
885 * Set device hardware.
887 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
891 if (ISSET(t->c_cflag, CLOCAL) &&
892 !ISSET(tp->t_cflag, CLOCAL)) {
894 * XXX disconnections would be too hard to
895 * get rid of without this kludge. The only
896 * way to get rid of controlling terminals
897 * is to exit from the session leader.
899 CLR(tp->t_state, TS_ZOMBIE);
901 wakeup(TSA_CARR_ON(tp));
905 if ((ISSET(tp->t_state, TS_CARR_ON) ||
906 ISSET(t->c_cflag, CLOCAL)) &&
907 !ISSET(tp->t_state, TS_ZOMBIE))
908 SET(tp->t_state, TS_CONNECTED);
910 CLR(tp->t_state, TS_CONNECTED);
911 tp->t_cflag = t->c_cflag;
912 tp->t_ispeed = t->c_ispeed;
913 if (t->c_ospeed != 0)
914 tp->t_ospeed = t->c_ospeed;
917 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
919 if (ISSET(t->c_lflag, ICANON))
920 SET(tp->t_lflag, PENDIN);
923 * XXX we really shouldn't allow toggling
924 * ICANON while we're in a non-termios line
925 * discipline. Now we have to worry about
926 * panicing for a null queue.
928 if (tp->t_canq.c_cbreserved > 0 &&
929 tp->t_rawq.c_cbreserved > 0) {
930 catq(&tp->t_rawq, &tp->t_canq);
932 * XXX the queue limits may be
933 * different, so the old queue
934 * swapping method no longer works.
936 catq(&tp->t_canq, &tp->t_rawq);
938 CLR(tp->t_lflag, PENDIN);
942 tp->t_iflag = t->c_iflag;
943 tp->t_oflag = t->c_oflag;
945 * Make the EXTPROC bit read only.
947 if (ISSET(tp->t_lflag, EXTPROC))
948 SET(t->c_lflag, EXTPROC);
950 CLR(t->c_lflag, EXTPROC);
951 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
952 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
953 t->c_cc[VTIME] != tp->t_cc[VTIME])
955 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
959 case TIOCSETD: { /* set line discipline */
960 register int t = *(int *)data;
961 dev_t device = tp->t_dev;
963 if ((u_int)t >= nlinesw)
965 if (t != tp->t_line) {
967 (*linesw[tp->t_line].l_close)(tp, flag);
968 error = (*linesw[t].l_open)(device, tp);
970 (void)(*linesw[tp->t_line].l_open)(device, tp);
979 case TIOCSTART: /* start output, like ^Q */
981 if (ISSET(tp->t_state, TS_TTSTOP) ||
982 ISSET(tp->t_lflag, FLUSHO)) {
983 CLR(tp->t_lflag, FLUSHO);
984 CLR(tp->t_state, TS_TTSTOP);
989 case TIOCSTI: /* simulate terminal input */
990 if ((flag & FREAD) == 0 && suser(p))
992 if (!isctty(p, tp) && suser(p))
995 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
998 case TIOCSTOP: /* stop output, like ^S */
1000 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1001 SET(tp->t_state, TS_TTSTOP);
1002 (*tp->t_stop)(tp, 0);
1006 case TIOCSCTTY: /* become controlling tty */
1007 /* Session ctty vnode pointer set in vnode layer. */
1008 if (!SESS_LEADER(p) ||
1009 ((p->p_session->s_ttyvp || tp->t_session) &&
1010 (tp->t_session != p->p_session)))
1012 tp->t_session = p->p_session;
1013 tp->t_pgrp = p->p_pgrp;
1014 p->p_session->s_ttyp = tp;
1015 p->p_flag |= P_CONTROLT;
1017 case TIOCSPGRP: { /* set pgrp of tty */
1018 register struct pgrp *pgrp = pgfind(*(int *)data);
1022 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1027 case TIOCSTAT: /* simulate control-T */
1032 case TIOCSWINSZ: /* set window size */
1033 if (bcmp((caddr_t)&tp->t_winsize, data,
1034 sizeof (struct winsize))) {
1035 tp->t_winsize = *(struct winsize *)data;
1036 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1039 case TIOCSDRAINWAIT:
1043 tp->t_timeout = *(int *)data * hz;
1044 wakeup(TSA_OCOMPLETE(tp));
1045 wakeup(TSA_OLOWAT(tp));
1047 case TIOCGDRAINWAIT:
1048 *(int *)data = tp->t_timeout / hz;
1051 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1052 return (ttcompat(tp, cmd, data, flag));
1061 ttypoll(dev, events, p)
1071 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1072 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1076 if (events & (POLLIN | POLLRDNORM)) {
1077 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1078 revents |= events & (POLLIN | POLLRDNORM);
1080 selrecord(p, &tp->t_rsel);
1082 if (events & (POLLOUT | POLLWRNORM)) {
1083 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1084 ISSET(tp->t_state, TS_CONNECTED))
1085 || ISSET(tp->t_state, TS_ZOMBIE))
1086 revents |= events & (POLLOUT | POLLWRNORM);
1088 selrecord(p, &tp->t_wsel);
1094 static struct filterops ttyread_filtops =
1095 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1096 static struct filterops ttywrite_filtops =
1097 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1100 ttykqfilter(dev, kn)
1104 struct tty *tp = dev->si_tty;
1105 struct klist *klist;
1108 switch (kn->kn_filter) {
1110 klist = &tp->t_rsel.si_note;
1111 kn->kn_fop = &ttyread_filtops;
1114 klist = &tp->t_wsel.si_note;
1115 kn->kn_fop = &ttywrite_filtops;
1121 kn->kn_hook = (caddr_t)dev;
1124 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1131 filt_ttyrdetach(struct knote *kn)
1133 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1136 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1141 filt_ttyread(struct knote *kn, long hint)
1143 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1145 kn->kn_data = ttnread(tp);
1146 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1147 kn->kn_flags |= EV_EOF;
1150 return (kn->kn_data > 0);
1154 filt_ttywdetach(struct knote *kn)
1156 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1159 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1164 filt_ttywrite(kn, hint)
1168 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1170 kn->kn_data = tp->t_outq.c_cc;
1171 if (ISSET(tp->t_state, TS_ZOMBIE))
1173 return (kn->kn_data <= tp->t_olowat &&
1174 ISSET(tp->t_state, TS_CONNECTED));
1178 * Must be called at spltty().
1186 if (ISSET(tp->t_lflag, PENDIN))
1188 nread = tp->t_canq.c_cc;
1189 if (!ISSET(tp->t_lflag, ICANON)) {
1190 nread += tp->t_rawq.c_cc;
1191 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1198 * Wait for output to drain.
1202 register struct tty *tp;
1208 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1209 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1211 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1212 ISSET(tp->t_state, TS_CONNECTED)) {
1213 SET(tp->t_state, TS_SO_OCOMPLETE);
1214 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1215 TTOPRI | PCATCH, "ttywai",
1218 if (error == EWOULDBLOCK)
1225 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1232 * Flush if successfully wait.
1240 if ((error = ttywait(tp)) == 0)
1241 ttyflush(tp, FREAD);
1246 * Flush tty read and/or write queues, notifying anyone waiting.
1250 register struct tty *tp;
1260 FLUSHQ(&tp->t_outq);
1261 CLR(tp->t_state, TS_TTSTOP);
1263 (*tp->t_stop)(tp, rw);
1265 FLUSHQ(&tp->t_canq);
1266 FLUSHQ(&tp->t_rawq);
1267 CLR(tp->t_lflag, PENDIN);
1270 CLR(tp->t_state, TS_LOCAL);
1272 if (ISSET(tp->t_state, TS_TBLOCK)) {
1274 FLUSHQ(&tp->t_outq);
1278 * Don't let leave any state that might clobber the
1279 * next line discipline (although we should do more
1280 * to send the START char). Not clearing the state
1281 * may have caused the "putc to a clist with no
1282 * reserved cblocks" panic/printf.
1284 CLR(tp->t_state, TS_TBLOCK);
1286 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1287 if (ISSET(tp->t_iflag, IXOFF)) {
1289 * XXX wait a bit in the hope that the stop
1290 * character (if any) will go out. Waiting
1291 * isn't good since it allows races. This
1292 * will be fixed when the stop character is
1293 * put in a special queue. Don't bother with
1294 * the checks in ttywait() since the timeout
1297 SET(tp->t_state, TS_SO_OCOMPLETE);
1298 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1301 * Don't try sending the stop character again.
1303 CLR(tp->t_state, TS_TBLOCK);
1310 FLUSHQ(&tp->t_outq);
1317 * Copy in the default termios characters.
1324 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1335 termioschars(&tp->t_termios);
1339 * Handle input high water. Send stop character for the IXOFF case. Turn
1340 * on our input flow control bit and propagate the changes to the driver.
1341 * XXX the stop character should be put in a special high priority queue.
1348 SET(tp->t_state, TS_TBLOCK);
1349 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1350 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1351 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1356 * Handle input low water. Send start character for the IXOFF case. Turn
1357 * off our input flow control bit and propagate the changes to the driver.
1358 * XXX the start character should be put in a special high priority queue.
1365 CLR(tp->t_state, TS_TBLOCK);
1366 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1367 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1368 SET(tp->t_state, TS_TBLOCK); /* try again later */
1373 /* Not used by any current (i386) drivers. */
1375 * Restart after an inter-char delay.
1384 KASSERT(tp_arg != NULL, ("ttrstrt"));
1389 CLR(tp->t_state, TS_TIMEOUT);
1401 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1407 * "close" a line discipline
1415 if (flag & FNONBLOCK || ttywflush(tp))
1416 ttyflush(tp, FREAD | FWRITE);
1421 * Handle modem control transition on a tty.
1422 * Flag indicates new state of carrier.
1423 * Returns 0 if the line should be turned off, otherwise 1.
1427 register struct tty *tp;
1431 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1433 * MDMBUF: do flow control according to carrier flag
1434 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1435 * works if IXON and IXANY are clear.
1438 CLR(tp->t_state, TS_CAR_OFLOW);
1439 CLR(tp->t_state, TS_TTSTOP);
1441 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1442 SET(tp->t_state, TS_CAR_OFLOW);
1443 SET(tp->t_state, TS_TTSTOP);
1444 (*tp->t_stop)(tp, 0);
1446 } else if (flag == 0) {
1450 CLR(tp->t_state, TS_CARR_ON);
1451 if (ISSET(tp->t_state, TS_ISOPEN) &&
1452 !ISSET(tp->t_cflag, CLOCAL)) {
1453 SET(tp->t_state, TS_ZOMBIE);
1454 CLR(tp->t_state, TS_CONNECTED);
1455 if (tp->t_session && tp->t_session->s_leader)
1456 psignal(tp->t_session->s_leader, SIGHUP);
1457 ttyflush(tp, FREAD | FWRITE);
1464 SET(tp->t_state, TS_CARR_ON);
1465 if (!ISSET(tp->t_state, TS_ZOMBIE))
1466 SET(tp->t_state, TS_CONNECTED);
1467 wakeup(TSA_CARR_ON(tp));
1475 * Reinput pending characters after state switch
1480 register struct tty *tp;
1485 CLR(tp->t_lflag, PENDIN);
1486 SET(tp->t_state, TS_TYPEN);
1488 * XXX this assumes too much about clist internals. It may even
1489 * fail if the cblock slush pool is empty. We can't allocate more
1490 * cblocks here because we are called from an interrupt handler
1491 * and clist_alloc_cblocks() can wait.
1494 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1495 tp->t_rawq.c_cbmax = tq.c_cbmax;
1496 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1497 while ((c = getc(&tq)) >= 0)
1499 CLR(tp->t_state, TS_TYPEN);
1503 * Process a read call on a tty device.
1506 ttread(tp, uio, flag)
1507 register struct tty *tp;
1511 register struct clist *qp;
1513 register tcflag_t lflag;
1514 register cc_t *cc = tp->t_cc;
1515 register struct proc *p = curproc;
1516 int s, first, error = 0;
1517 int has_stime = 0, last_cc = 0;
1518 long slp = 0; /* XXX this should be renamed `timo'. */
1519 struct timeval stime;
1523 lflag = tp->t_lflag;
1525 * take pending input first
1527 if (ISSET(lflag, PENDIN)) {
1529 splx(s); /* reduce latency */
1531 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1535 * Hang process if it's in the background.
1537 if (isbackground(p, tp)) {
1539 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1540 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1541 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1543 pgsignal(p->p_pgrp, SIGTTIN, 1);
1544 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1550 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1552 return (0); /* EOF */
1556 * If canonical, use the canonical queue,
1557 * else use the raw queue.
1559 * (should get rid of clists...)
1561 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1563 if (flag & IO_NDELAY) {
1566 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1571 return (EWOULDBLOCK);
1573 if (!ISSET(lflag, ICANON)) {
1576 struct timeval timecopy;
1579 * Check each of the four combinations.
1580 * (m > 0 && t == 0) is the normal read case.
1581 * It should be fairly efficient, so we check that and its
1582 * companion case (m == 0 && t == 0) first.
1583 * For the other two cases, we compute the target sleep time
1592 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1596 t *= 100000; /* time in us */
1597 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1598 ((t1).tv_usec - (t2).tv_usec))
1604 getmicrotime(&timecopy);
1606 /* first character, start timer */
1610 } else if (qp->c_cc > last_cc) {
1611 /* got a character, restart timer */
1615 /* nothing, check expiration */
1616 slp = t - diff(timecopy, stime);
1621 } else { /* m == 0 */
1624 getmicrotime(&timecopy);
1630 slp = t - diff(timecopy, stime);
1632 /* Timed out, but 0 is enough input. */
1640 * Rounding down may make us wake up just short
1641 * of the target, so we round up.
1642 * The formula is ceiling(slp * hz/1000000).
1643 * 32-bit arithmetic is enough for hz < 169.
1644 * XXX see tvtohz() for how to avoid overflow if hz
1645 * is large (divide by `tick' and/or arrange to
1646 * use tvtohz() if hz is large).
1648 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1651 if (qp->c_cc <= 0) {
1654 * There is no input, or not enough input and we can block.
1656 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1657 ISSET(tp->t_state, TS_CONNECTED) ?
1658 "ttyin" : "ttyhup", (int)slp);
1660 if (error == EWOULDBLOCK)
1665 * XXX what happens if another process eats some input
1666 * while we are asleep (not just here)? It would be
1667 * safest to detect changes and reset our state variables
1668 * (has_stime and last_cc).
1676 * Input present, check for input mapping and processing.
1679 if (ISSET(lflag, ICANON | ISIG))
1685 icc = imin(uio->uio_resid, IBUFSIZ);
1686 icc = q_to_b(qp, ibuf, icc);
1692 error = uiomove(ibuf, icc, uio);
1694 * XXX if there was an error then we should ungetc() the
1695 * unmoved chars and reduce icc here.
1699 if (uio->uio_resid == 0)
1713 * delayed suspend (^Y)
1715 if (CCEQ(cc[VDSUSP], c) &&
1716 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1717 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1719 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1728 * Interpret EOF only in canonical mode.
1730 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1733 * Give user character.
1735 error = ureadc(c, uio);
1737 /* XXX should ungetc(c, qp). */
1739 if (uio->uio_resid == 0)
1742 * In canonical mode check for a "break character"
1743 * marking the end of a "line of input".
1745 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1752 * Look to unblock input now that (presumably)
1753 * the input queue has gone down.
1756 if (ISSET(tp->t_state, TS_TBLOCK) &&
1757 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1765 * Check the output queue on tp for space for a kernel message (from uprintf
1766 * or tprintf). Allow some space over the normal hiwater mark so we don't
1767 * lose messages due to normal flow control, but don't let the tty run amok.
1768 * Sleeps here are not interruptible, but we return prematurely if new signals
1772 ttycheckoutq(tp, wait)
1773 register struct tty *tp;
1779 hiwat = tp->t_ohiwat;
1780 SIGEMPTYSET(oldmask);
1783 oldmask = curproc->p_siglist;
1784 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1785 while (tp->t_outq.c_cc > hiwat) {
1787 if (tp->t_outq.c_cc <= hiwat)
1789 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1793 SET(tp->t_state, TS_SO_OLOWAT);
1794 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1801 * Process a write call on a tty device.
1804 ttwrite(tp, uio, flag)
1805 register struct tty *tp;
1806 register struct uio *uio;
1809 register char *cp = NULL;
1810 register int cc, ce;
1811 register struct proc *p;
1812 int i, hiwat, cnt, error, s;
1815 hiwat = tp->t_ohiwat;
1816 cnt = uio->uio_resid;
1821 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1823 if (uio->uio_resid == cnt)
1827 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1828 if (flag & IO_NDELAY) {
1830 error = EWOULDBLOCK;
1833 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1842 * Hang the process if it's in the background.
1845 if (isbackground(p, tp) &&
1846 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1847 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1848 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1849 if (p->p_pgrp->pg_jobc == 0) {
1853 pgsignal(p->p_pgrp, SIGTTOU, 1);
1854 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1860 * Process the user's data in at most OBUFSIZ chunks. Perform any
1861 * output translation. Keep track of high water mark, sleep on
1862 * overflow awaiting device aid in acquiring new space.
1864 while (uio->uio_resid > 0 || cc > 0) {
1865 if (ISSET(tp->t_lflag, FLUSHO)) {
1869 if (tp->t_outq.c_cc > hiwat)
1872 * Grab a hunk of data from the user, unless we have some
1873 * leftover from last time.
1876 cc = imin(uio->uio_resid, OBUFSIZ);
1878 error = uiomove(cp, cc, uio);
1885 * If nothing fancy need be done, grab those characters we
1886 * can handle without any of ttyoutput's processing and
1887 * just transfer them to the output q. For those chars
1888 * which require special processing (as indicated by the
1889 * bits in char_type), call ttyoutput. After processing
1890 * a hunk of data, look for FLUSHO so ^O's will take effect
1894 if (!ISSET(tp->t_oflag, OPOST))
1897 ce = cc - scanc((u_int)cc, (u_char *)cp,
1898 char_type, CCLASSMASK);
1900 * If ce is zero, then we're processing
1901 * a special character through ttyoutput.
1905 if (ttyoutput(*cp, tp) >= 0) {
1906 /* No Clists, wait a bit. */
1908 if (flag & IO_NDELAY) {
1909 error = EWOULDBLOCK;
1912 error = ttysleep(tp, &lbolt,
1921 if (ISSET(tp->t_lflag, FLUSHO) ||
1922 tp->t_outq.c_cc > hiwat)
1928 * A bunch of normal characters have been found.
1929 * Transfer them en masse to the output queue and
1930 * continue processing at the top of the loop.
1931 * If there are any further characters in this
1932 * <= OBUFSIZ chunk, the first should be a character
1933 * requiring special handling by ttyoutput.
1936 i = b_to_q(cp, ce, &tp->t_outq);
1939 cp += ce, cc -= ce, tk_nout += ce;
1942 /* No Clists, wait a bit. */
1944 if (flag & IO_NDELAY) {
1945 error = EWOULDBLOCK;
1948 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1954 if (ISSET(tp->t_lflag, FLUSHO) ||
1955 tp->t_outq.c_cc > hiwat)
1962 * If cc is nonzero, we leave the uio structure inconsistent, as the
1963 * offset and iov pointers have moved forward, but it doesn't matter
1964 * (the call will either return short or restart with a new uio).
1966 uio->uio_resid += cc;
1973 * This can only occur if FLUSHO is set in t_lflag,
1974 * or if ttstart/oproc is synchronous (or very fast).
1976 if (tp->t_outq.c_cc <= hiwat) {
1980 if (flag & IO_NDELAY) {
1982 uio->uio_resid += cc;
1983 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1985 SET(tp->t_state, TS_SO_OLOWAT);
1986 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1989 if (error == EWOULDBLOCK)
1997 * Rubout one character from the rawq of tp
1998 * as cleanly as possible.
2003 register struct tty *tp;
2006 register int savecol;
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.
2096 register struct tty *tp;
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
2114 register struct tty *tp;
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.
2150 register struct tty *tp;
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.
2177 register struct tty *tp;
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.
2193 register struct tty *tp;
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 register 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 register 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.
2298 register struct tty *tp;
2300 register 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 register 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, pri, wmesg, timo)
2462 error = tsleep(chan, pri, 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));