2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
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8 * the permission of UNIX System Laboratories, Inc.
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20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
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29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $Id: tty.c,v 1.110 1998/12/08 10:22:07 bde Exp $
44 * o Fix races for sending the start char in ttyflush().
45 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
46 * With luck, there will be MIN chars before select() returns().
47 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
48 * o Don't allow input in TS_ZOMBIE case. It would be visible through
50 * o Do the new sio locking stuff here and use it to avoid special
53 * o Move EXTPROC and/or PENDIN to t_state?
54 * o Wrap most of ttioctl in spltty/splx.
55 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
56 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
57 * o Don't allow certain termios flags to affect disciplines other
58 * than TTYDISC. Cancel their effects before switch disciplines
59 * and ignore them if they are set while we are in another
61 * o Now that historical speed conversions are handled here, don't
63 * o Check for TS_CARR_ON being set while everything is closed and not
64 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
65 * so it would live until the next open even if carrier drops.
66 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
67 * 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>
95 #include <sys/snoop.h>
101 #include <vm/vm_map.h>
103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105 static int proc_compare __P((struct proc *p1, struct proc *p2));
106 static int ttnread __P((struct tty *tp));
107 static void ttyecho __P((int c, struct tty *tp));
108 static int ttyoutput __P((int c, register struct tty *tp));
109 static void ttypend __P((struct tty *tp));
110 static void ttyretype __P((struct tty *tp));
111 static void ttyrub __P((int c, struct tty *tp));
112 static void ttyrubo __P((struct tty *tp, int cnt));
113 static void ttyunblock __P((struct tty *tp));
114 static int ttywflush __P((struct tty *tp));
117 * Table with character classes and parity. The 8th bit indicates parity,
118 * the 7th bit indicates the character is an alphameric or underscore (for
119 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
120 * are 0 then the character needs no special processing on output; classes
121 * other than 0 might be translated or (not currently) require delays.
123 #define E 0x00 /* Even parity. */
124 #define O 0x80 /* Odd parity. */
125 #define PARITY(c) (char_type[c] & O)
127 #define ALPHA 0x40 /* Alpha or underscore. */
128 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
130 #define CCLASSMASK 0x3f
131 #define CCLASS(c) (char_type[c] & CCLASSMASK)
136 #define NA ORDINARY | ALPHA
142 static u_char const char_type[] = {
143 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
144 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
145 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
146 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
147 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
148 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
149 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
150 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
151 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
152 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
154 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
155 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
156 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
157 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
158 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
160 * Meta chars; should be settable per character set;
161 * for now, treat them all as normal characters.
163 NA, NA, NA, NA, NA, NA, NA, NA,
164 NA, NA, NA, NA, NA, NA, NA, NA,
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,
189 /* Macros to clear/set/test flags. */
190 #define SET(t, f) (t) |= (f)
191 #define CLR(t, f) (t) &= ~(f)
192 #define ISSET(t, f) ((t) & (f))
194 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
195 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
198 * Initial open of tty, or (re)entry to standard tty line discipline.
203 register struct tty *tp;
209 if (!ISSET(tp->t_state, TS_ISOPEN)) {
210 SET(tp->t_state, TS_ISOPEN);
211 if (ISSET(tp->t_cflag, CLOCAL))
212 SET(tp->t_state, TS_CONNECTED);
213 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
221 * Handle close() on a tty line: flush and set to initial state,
222 * bumping generation number so that pending read/write calls
223 * can detect recycling of the tty.
224 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
225 * and l_close() should have flushed, but we repeat the spltty() and
226 * the flush in case there are buggy callers.
230 register struct tty *tp;
234 funsetown(tp->t_sigio);
239 ttyflush(tp, FREAD | FWRITE);
240 clist_free_cblocks(&tp->t_canq);
241 clist_free_cblocks(&tp->t_outq);
242 clist_free_cblocks(&tp->t_rawq);
245 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
246 snpdown((struct snoop *)tp->t_sc);
250 tp->t_line = TTYDISC;
252 tp->t_session = NULL;
258 #define FLUSHQ(q) { \
260 ndflush(q, (q)->c_cc); \
263 /* Is 'c' a line delimiter ("break" character)? */
264 #define TTBREAKC(c, lflag) \
265 ((c) == '\n' || (((c) == cc[VEOF] || \
266 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
267 (c) != _POSIX_VDISABLE))
270 * Process input of a single character received on a tty.
275 register struct tty *tp;
277 register tcflag_t iflag, lflag;
282 * If input is pending take it first.
285 if (ISSET(lflag, PENDIN))
290 if (ISSET(lflag, ICANON)) {
300 * Block further input iff:
301 * current input > threshold AND input is available to user program
302 * AND input flow control is enabled and not yet invoked.
303 * The 3 is slop for PARMRK.
306 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
307 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
308 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
309 !ISSET(tp->t_state, TS_TBLOCK))
312 /* Handle exceptional conditions (break, parity, framing). */
314 err = (ISSET(c, TTY_ERRORMASK));
316 CLR(c, TTY_ERRORMASK);
317 if (ISSET(err, TTY_BI)) {
318 if (ISSET(iflag, IGNBRK))
320 if (ISSET(iflag, BRKINT)) {
321 ttyflush(tp, FREAD | FWRITE);
322 pgsignal(tp->t_pgrp, SIGINT, 1);
325 if (ISSET(iflag, PARMRK))
327 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
328 || ISSET(err, TTY_FE)) {
329 if (ISSET(iflag, IGNPAR))
331 else if (ISSET(iflag, PARMRK)) {
333 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
336 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
337 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
338 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
345 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
347 if (!ISSET(lflag, EXTPROC)) {
349 * Check for literal nexting very first
351 if (ISSET(tp->t_state, TS_LNCH)) {
353 CLR(tp->t_state, TS_LNCH);
356 * Scan for special characters. This code
357 * is really just a big case statement with
358 * non-constant cases. The bottom of the
359 * case statement is labeled ``endcase'', so goto
360 * it after a case match, or similar.
364 * Control chars which aren't controlled
365 * by ICANON, ISIG, or IXON.
367 if (ISSET(lflag, IEXTEN)) {
368 if (CCEQ(cc[VLNEXT], c)) {
369 if (ISSET(lflag, ECHO)) {
370 if (ISSET(lflag, ECHOE)) {
371 (void)ttyoutput('^', tp);
372 (void)ttyoutput('\b', tp);
376 SET(tp->t_state, TS_LNCH);
379 if (CCEQ(cc[VDISCARD], c)) {
380 if (ISSET(lflag, FLUSHO))
381 CLR(tp->t_lflag, FLUSHO);
383 ttyflush(tp, FWRITE);
385 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
387 SET(tp->t_lflag, FLUSHO);
395 if (ISSET(lflag, ISIG)) {
396 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
397 if (!ISSET(lflag, NOFLSH))
398 ttyflush(tp, FREAD | FWRITE);
401 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
404 if (CCEQ(cc[VSUSP], c)) {
405 if (!ISSET(lflag, NOFLSH))
408 pgsignal(tp->t_pgrp, SIGTSTP, 1);
413 * Handle start/stop characters.
415 if (ISSET(iflag, IXON)) {
416 if (CCEQ(cc[VSTOP], c)) {
417 if (!ISSET(tp->t_state, TS_TTSTOP)) {
418 SET(tp->t_state, TS_TTSTOP);
419 #ifdef sun4c /* XXX */
420 (*tp->t_stop)(tp, 0);
422 (*cdevsw[major(tp->t_dev)]->d_stop)(tp,
427 if (!CCEQ(cc[VSTART], c))
430 * if VSTART == VSTOP then toggle
434 if (CCEQ(cc[VSTART], c))
438 * IGNCR, ICRNL, & INLCR
441 if (ISSET(iflag, IGNCR))
443 else if (ISSET(iflag, ICRNL))
445 } else if (c == '\n' && ISSET(iflag, INLCR))
448 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
450 * From here on down canonical mode character
451 * processing takes place.
456 if (CCEQ(cc[VERASE], c)) {
458 ttyrub(unputc(&tp->t_rawq), tp);
464 if (CCEQ(cc[VKILL], c)) {
465 if (ISSET(lflag, ECHOKE) &&
466 tp->t_rawq.c_cc == tp->t_rocount &&
467 !ISSET(lflag, ECHOPRT))
468 while (tp->t_rawq.c_cc)
469 ttyrub(unputc(&tp->t_rawq), tp);
472 if (ISSET(lflag, ECHOK) ||
473 ISSET(lflag, ECHOKE))
478 CLR(tp->t_state, TS_LOCAL);
484 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
490 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
495 * erase last char of word and remember the
496 * next chars type (for ALTWERASE)
499 c = unputc(&tp->t_rawq);
502 if (c == ' ' || c == '\t') {
503 (void)putc(c, &tp->t_rawq);
512 c = unputc(&tp->t_rawq);
515 } while (c != ' ' && c != '\t' &&
516 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
517 (void)putc(c, &tp->t_rawq);
523 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
528 * ^T - kernel info and generate SIGINFO
530 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
531 if (ISSET(lflag, ISIG))
532 pgsignal(tp->t_pgrp, SIGINFO, 1);
533 if (!ISSET(lflag, NOKERNINFO))
539 * Check for input buffer overflow
541 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
543 if (ISSET(iflag, IMAXBEL)) {
544 if (tp->t_outq.c_cc < tp->t_ohiwat)
545 (void)ttyoutput(CTRL('g'), tp);
550 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
551 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
552 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
555 * Put data char in q for user and
556 * wakeup on seeing a line delimiter.
558 if (putc(c, &tp->t_rawq) >= 0) {
559 if (!ISSET(lflag, ICANON)) {
564 if (TTBREAKC(c, lflag)) {
566 catq(&tp->t_rawq, &tp->t_canq);
568 } else if (tp->t_rocount++ == 0)
569 tp->t_rocol = tp->t_column;
570 if (ISSET(tp->t_state, TS_ERASE)) {
572 * end of prterase \.../
574 CLR(tp->t_state, TS_ERASE);
575 (void)ttyoutput('/', tp);
579 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
581 * Place the cursor over the '^' of the ^D.
583 i = imin(2, tp->t_column - i);
585 (void)ttyoutput('\b', tp);
592 * IXANY means allow any character to restart output.
594 if (ISSET(tp->t_state, TS_TTSTOP) &&
595 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
598 CLR(tp->t_lflag, FLUSHO);
599 CLR(tp->t_state, TS_TTSTOP);
601 return (ttstart(tp));
605 * Output a single character on a tty, doing output processing
606 * as needed (expanding tabs, newline processing, etc.).
607 * Returns < 0 if succeeds, otherwise returns char to resend.
613 register struct tty *tp;
615 register tcflag_t oflag;
619 if (!ISSET(oflag, OPOST)) {
620 if (ISSET(tp->t_lflag, FLUSHO))
622 if (putc(c, &tp->t_outq))
629 * Do tab expansion if OXTABS is set. Special case if we external
630 * processing, we don't do the tab expansion because we'll probably
631 * get it wrong. If tab expansion needs to be done, let it happen
634 CLR(c, ~TTY_CHARMASK);
636 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
637 c = 8 - (tp->t_column & 7);
638 if (!ISSET(tp->t_lflag, FLUSHO)) {
639 s = spltty(); /* Don't interrupt tabs. */
640 c -= b_to_q(" ", c, &tp->t_outq);
646 return (c ? -1 : '\t');
648 if (c == CEOT && ISSET(oflag, ONOEOT))
652 * Newline translation: if ONLCR is set,
653 * translate newline into "\r\n".
655 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
658 if (putc('\r', &tp->t_outq))
663 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
682 col = (col + 8) & ~7;
690 * Ioctls for all tty devices. Called after line-discipline specific ioctl
691 * has been called to do discipline-specific functions and/or reject any
692 * of these ioctl commands.
696 ttioctl(tp, cmd, data, flag)
697 register struct tty *tp;
702 register struct proc *p;
705 p = curproc; /* XXX */
707 /* If the ioctl involves modification, hang if in the background. */
731 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
741 while (isbackground(p, tp) &&
742 (p->p_flag & P_PPWAIT) == 0 &&
743 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
744 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
745 if (p->p_pgrp->pg_jobc == 0)
747 pgsignal(p->p_pgrp, SIGTTOU, 1);
748 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
756 switch (cmd) { /* Process the ioctl. */
757 case FIOASYNC: /* set/clear async i/o */
760 SET(tp->t_state, TS_ASYNC);
762 CLR(tp->t_state, TS_ASYNC);
765 case FIONBIO: /* set/clear non-blocking i/o */
766 break; /* XXX: delete. */
767 case FIONREAD: /* get # bytes to read */
769 *(int *)data = ttnread(tp);
775 * Policy -- Don't allow FIOSETOWN on someone else's
778 if (tp->t_session != NULL && !isctty(p, tp))
781 error = fsetown(*(int *)data, &tp->t_sigio);
786 if (tp->t_session != NULL && !isctty(p, tp))
788 *(int *)data = fgetown(tp->t_sigio);
791 case TIOCEXCL: /* set exclusive use of tty */
793 SET(tp->t_state, TS_XCLUDE);
796 case TIOCFLUSH: { /* flush buffers */
797 register int flags = *(int *)data;
800 flags = FREAD | FWRITE;
802 flags &= FREAD | FWRITE;
806 case TIOCCONS: /* become virtual console */
808 if (constty && constty != tp &&
809 ISSET(constty->t_state, TS_CONNECTED))
812 if (error = suser(p->p_ucred, &p->p_acflag))
816 } else if (tp == constty)
819 case TIOCDRAIN: /* wait till output drained */
824 case TIOCGETA: { /* get termios struct */
825 struct termios *t = (struct termios *)data;
827 bcopy(&tp->t_termios, t, sizeof(struct termios));
830 case TIOCGETD: /* get line discipline */
831 *(int *)data = tp->t_line;
833 case TIOCGWINSZ: /* get window size */
834 *(struct winsize *)data = tp->t_winsize;
836 case TIOCGPGRP: /* get pgrp of tty */
839 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
842 case TIOCHPCL: /* hang up on last close */
844 SET(tp->t_cflag, HUPCL);
848 case TIOCNXCL: /* reset exclusive use of tty */
850 CLR(tp->t_state, TS_XCLUDE);
853 case TIOCOUTQ: /* output queue size */
854 *(int *)data = tp->t_outq.c_cc;
856 case TIOCSETA: /* set termios struct */
857 case TIOCSETAW: /* drain output, set */
858 case TIOCSETAF: { /* drn out, fls in, set */
859 register struct termios *t = (struct termios *)data;
861 if (t->c_ispeed == 0)
862 t->c_ispeed = t->c_ospeed;
863 if (t->c_ispeed == 0)
864 t->c_ispeed = tp->t_ospeed;
865 if (t->c_ispeed == 0)
868 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
874 if (cmd == TIOCSETAF)
877 if (!ISSET(t->c_cflag, CIGNORE)) {
879 * Set device hardware.
881 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
885 if (ISSET(t->c_cflag, CLOCAL) &&
886 !ISSET(tp->t_cflag, CLOCAL)) {
888 * XXX disconnections would be too hard to
889 * get rid of without this kludge. The only
890 * way to get rid of controlling terminals
891 * is to exit from the session leader.
893 CLR(tp->t_state, TS_ZOMBIE);
895 wakeup(TSA_CARR_ON(tp));
899 if ((ISSET(tp->t_state, TS_CARR_ON) ||
900 ISSET(t->c_cflag, CLOCAL)) &&
901 !ISSET(tp->t_state, TS_ZOMBIE))
902 SET(tp->t_state, TS_CONNECTED);
904 CLR(tp->t_state, TS_CONNECTED);
905 tp->t_cflag = t->c_cflag;
906 tp->t_ispeed = t->c_ispeed;
907 if (t->c_ospeed != 0)
908 tp->t_ospeed = t->c_ospeed;
911 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
913 if (ISSET(t->c_lflag, ICANON))
914 SET(tp->t_lflag, PENDIN);
917 * XXX we really shouldn't allow toggling
918 * ICANON while we're in a non-termios line
919 * discipline. Now we have to worry about
920 * panicing for a null queue.
922 if (tp->t_canq.c_cbreserved > 0 &&
923 tp->t_rawq.c_cbreserved > 0) {
924 catq(&tp->t_rawq, &tp->t_canq);
926 * XXX the queue limits may be
927 * different, so the old queue
928 * swapping method no longer works.
930 catq(&tp->t_canq, &tp->t_rawq);
932 CLR(tp->t_lflag, PENDIN);
936 tp->t_iflag = t->c_iflag;
937 tp->t_oflag = t->c_oflag;
939 * Make the EXTPROC bit read only.
941 if (ISSET(tp->t_lflag, EXTPROC))
942 SET(t->c_lflag, EXTPROC);
944 CLR(t->c_lflag, EXTPROC);
945 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
946 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
947 t->c_cc[VTIME] != tp->t_cc[VTIME])
949 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
953 case TIOCSETD: { /* set line discipline */
954 register int t = *(int *)data;
955 dev_t device = tp->t_dev;
957 if ((u_int)t >= nlinesw)
959 if (t != tp->t_line) {
961 (*linesw[tp->t_line].l_close)(tp, flag);
962 error = (*linesw[t].l_open)(device, tp);
964 (void)(*linesw[tp->t_line].l_open)(device, tp);
973 case TIOCSTART: /* start output, like ^Q */
975 if (ISSET(tp->t_state, TS_TTSTOP) ||
976 ISSET(tp->t_lflag, FLUSHO)) {
977 CLR(tp->t_lflag, FLUSHO);
978 CLR(tp->t_state, TS_TTSTOP);
983 case TIOCSTI: /* simulate terminal input */
984 if (p->p_ucred->cr_uid && (flag & FREAD) == 0)
986 if (p->p_ucred->cr_uid && !isctty(p, tp))
989 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
992 case TIOCSTOP: /* stop output, like ^S */
994 if (!ISSET(tp->t_state, TS_TTSTOP)) {
995 SET(tp->t_state, TS_TTSTOP);
996 #ifdef sun4c /* XXX */
997 (*tp->t_stop)(tp, 0);
999 (*cdevsw[major(tp->t_dev)]->d_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:
1038 error = suser(p->p_ucred, &p->p_acflag);
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(tp, events, p)
1067 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1068 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1072 if (events & (POLLIN | POLLRDNORM))
1073 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1074 revents |= events & (POLLIN | POLLRDNORM);
1076 selrecord(p, &tp->t_rsel);
1078 if (events & (POLLOUT | POLLWRNORM))
1079 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1080 ISSET(tp->t_state, TS_CONNECTED))
1081 || ISSET(tp->t_state, TS_ZOMBIE))
1082 revents |= events & (POLLOUT | POLLWRNORM);
1084 selrecord(p, &tp->t_wsel);
1090 * This is a wrapper for compatibility with the select vector used by
1091 * cdevsw. It relies on a proper xxxdevtotty routine.
1094 ttpoll(dev, events, p)
1099 return ttypoll((*cdevsw[major(dev)]->d_devtotty)(dev), events, p);
1103 * Must be called at spltty().
1111 if (ISSET(tp->t_lflag, PENDIN))
1113 nread = tp->t_canq.c_cc;
1114 if (!ISSET(tp->t_lflag, ICANON)) {
1115 nread += tp->t_rawq.c_cc;
1116 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1123 * Wait for output to drain.
1127 register struct tty *tp;
1133 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1134 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1136 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1137 ISSET(tp->t_state, TS_CONNECTED)) {
1138 SET(tp->t_state, TS_SO_OCOMPLETE);
1139 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1140 TTOPRI | PCATCH, "ttywai",
1143 if (error == EWOULDBLOCK)
1150 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1157 * Flush if successfully wait.
1165 if ((error = ttywait(tp)) == 0)
1166 ttyflush(tp, FREAD);
1171 * Flush tty read and/or write queues, notifying anyone waiting.
1175 register struct tty *tp;
1185 FLUSHQ(&tp->t_outq);
1186 CLR(tp->t_state, TS_TTSTOP);
1188 #ifdef sun4c /* XXX */
1189 (*tp->t_stop)(tp, rw);
1191 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw);
1194 FLUSHQ(&tp->t_canq);
1195 FLUSHQ(&tp->t_rawq);
1196 CLR(tp->t_lflag, PENDIN);
1199 CLR(tp->t_state, TS_LOCAL);
1201 if (ISSET(tp->t_state, TS_TBLOCK)) {
1203 FLUSHQ(&tp->t_outq);
1207 * Don't let leave any state that might clobber the
1208 * next line discipline (although we should do more
1209 * to send the START char). Not clearing the state
1210 * may have caused the "putc to a clist with no
1211 * reserved cblocks" panic/printf.
1213 CLR(tp->t_state, TS_TBLOCK);
1215 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1216 if (ISSET(tp->t_iflag, IXOFF)) {
1218 * XXX wait a bit in the hope that the stop
1219 * character (if any) will go out. Waiting
1220 * isn't good since it allows races. This
1221 * will be fixed when the stop character is
1222 * put in a special queue. Don't bother with
1223 * the checks in ttywait() since the timeout
1226 SET(tp->t_state, TS_SO_OCOMPLETE);
1227 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1230 * Don't try sending the stop character again.
1232 CLR(tp->t_state, TS_TBLOCK);
1239 FLUSHQ(&tp->t_outq);
1246 * Copy in the default termios characters.
1253 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1264 termioschars(&tp->t_termios);
1268 * Handle input high water. Send stop character for the IXOFF case. Turn
1269 * on our input flow control bit and propagate the changes to the driver.
1270 * XXX the stop character should be put in a special high priority queue.
1277 SET(tp->t_state, TS_TBLOCK);
1278 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1279 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1280 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1285 * Handle input low water. Send start character for the IXOFF case. Turn
1286 * off our input flow control bit and propagate the changes to the driver.
1287 * XXX the start character should be put in a special high priority queue.
1294 CLR(tp->t_state, TS_TBLOCK);
1295 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1296 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1297 SET(tp->t_state, TS_TBLOCK); /* try again later */
1302 /* Not used by any current (i386) drivers. */
1304 * Restart after an inter-char delay.
1313 KASSERT(tp_arg != NULL, ("ttrstrt"));
1318 CLR(tp->t_state, TS_TIMEOUT);
1330 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1336 * "close" a line discipline
1344 if (flag & FNONBLOCK || ttywflush(tp))
1345 ttyflush(tp, FREAD | FWRITE);
1350 * Handle modem control transition on a tty.
1351 * Flag indicates new state of carrier.
1352 * Returns 0 if the line should be turned off, otherwise 1.
1356 register struct tty *tp;
1360 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1362 * MDMBUF: do flow control according to carrier flag
1363 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1364 * works if IXON and IXANY are clear.
1367 CLR(tp->t_state, TS_CAR_OFLOW);
1368 CLR(tp->t_state, TS_TTSTOP);
1370 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1371 SET(tp->t_state, TS_CAR_OFLOW);
1372 SET(tp->t_state, TS_TTSTOP);
1373 #ifdef sun4c /* XXX */
1374 (*tp->t_stop)(tp, 0);
1376 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0);
1379 } else if (flag == 0) {
1383 CLR(tp->t_state, TS_CARR_ON);
1384 if (ISSET(tp->t_state, TS_ISOPEN) &&
1385 !ISSET(tp->t_cflag, CLOCAL)) {
1386 SET(tp->t_state, TS_ZOMBIE);
1387 CLR(tp->t_state, TS_CONNECTED);
1388 if (tp->t_session && tp->t_session->s_leader)
1389 psignal(tp->t_session->s_leader, SIGHUP);
1390 ttyflush(tp, FREAD | FWRITE);
1397 SET(tp->t_state, TS_CARR_ON);
1398 if (!ISSET(tp->t_state, TS_ZOMBIE))
1399 SET(tp->t_state, TS_CONNECTED);
1400 wakeup(TSA_CARR_ON(tp));
1408 * Reinput pending characters after state switch
1413 register struct tty *tp;
1418 CLR(tp->t_lflag, PENDIN);
1419 SET(tp->t_state, TS_TYPEN);
1421 * XXX this assumes too much about clist internals. It may even
1422 * fail if the cblock slush pool is empty. We can't allocate more
1423 * cblocks here because we are called from an interrupt handler
1424 * and clist_alloc_cblocks() can wait.
1427 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1428 tp->t_rawq.c_cbmax = tq.c_cbmax;
1429 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1430 while ((c = getc(&tq)) >= 0)
1432 CLR(tp->t_state, TS_TYPEN);
1436 * Process a read call on a tty device.
1439 ttread(tp, uio, flag)
1440 register struct tty *tp;
1444 register struct clist *qp;
1446 register tcflag_t lflag;
1447 register cc_t *cc = tp->t_cc;
1448 register struct proc *p = curproc;
1449 int s, first, error = 0;
1450 int has_stime = 0, last_cc = 0;
1451 long slp = 0; /* XXX this should be renamed `timo'. */
1452 struct timeval stime;
1456 lflag = tp->t_lflag;
1458 * take pending input first
1460 if (ISSET(lflag, PENDIN)) {
1462 splx(s); /* reduce latency */
1464 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1468 * Hang process if it's in the background.
1470 if (isbackground(p, tp)) {
1472 if ((p->p_sigignore & sigmask(SIGTTIN)) ||
1473 (p->p_sigmask & sigmask(SIGTTIN)) ||
1474 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
1476 pgsignal(p->p_pgrp, SIGTTIN, 1);
1477 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1483 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1485 return (0); /* EOF */
1489 * If canonical, use the canonical queue,
1490 * else use the raw queue.
1492 * (should get rid of clists...)
1494 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1496 if (flag & IO_NDELAY) {
1499 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1504 return (EWOULDBLOCK);
1506 if (!ISSET(lflag, ICANON)) {
1509 struct timeval timecopy;
1512 * Check each of the four combinations.
1513 * (m > 0 && t == 0) is the normal read case.
1514 * It should be fairly efficient, so we check that and its
1515 * companion case (m == 0 && t == 0) first.
1516 * For the other two cases, we compute the target sleep time
1525 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1529 t *= 100000; /* time in us */
1530 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1531 ((t1).tv_usec - (t2).tv_usec))
1537 getmicrotime(&timecopy);
1539 /* first character, start timer */
1543 } else if (qp->c_cc > last_cc) {
1544 /* got a character, restart timer */
1548 /* nothing, check expiration */
1549 slp = t - diff(timecopy, stime);
1554 } else { /* m == 0 */
1557 getmicrotime(&timecopy);
1563 slp = t - diff(timecopy, stime);
1565 /* Timed out, but 0 is enough input. */
1573 * Rounding down may make us wake up just short
1574 * of the target, so we round up.
1575 * The formula is ceiling(slp * hz/1000000).
1576 * 32-bit arithmetic is enough for hz < 169.
1577 * XXX see tvtohz() for how to avoid overflow if hz
1578 * is large (divide by `tick' and/or arrange to
1579 * use tvtohz() if hz is large).
1581 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1584 if (qp->c_cc <= 0) {
1587 * There is no input, or not enough input and we can block.
1589 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1590 ISSET(tp->t_state, TS_CONNECTED) ?
1591 "ttyin" : "ttyhup", (int)slp);
1593 if (error == EWOULDBLOCK)
1598 * XXX what happens if another process eats some input
1599 * while we are asleep (not just here)? It would be
1600 * safest to detect changes and reset our state variables
1601 * (has_stime and last_cc).
1609 * Input present, check for input mapping and processing.
1612 if (ISSET(lflag, ICANON | ISIG))
1618 icc = imin(uio->uio_resid, IBUFSIZ);
1619 icc = q_to_b(qp, ibuf, icc);
1625 error = uiomove(ibuf, icc, uio);
1627 * XXX if there was an error then we should ungetc() the
1628 * unmoved chars and reduce icc here.
1631 if (ISSET(tp->t_lflag, ECHO) &&
1632 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1633 snpin((struct snoop *)tp->t_sc, ibuf, icc);
1637 if (uio->uio_resid == 0)
1651 * delayed suspend (^Y)
1653 if (CCEQ(cc[VDSUSP], c) &&
1654 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1655 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1657 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1666 * Interpret EOF only in canonical mode.
1668 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1671 * Give user character.
1673 error = ureadc(c, uio);
1675 /* XXX should ungetc(c, qp). */
1679 * Only snoop directly on input in echo mode. Non-echoed
1680 * input will be snooped later iff the application echoes it.
1682 if (ISSET(tp->t_lflag, ECHO) &&
1683 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1684 snpinc((struct snoop *)tp->t_sc, (char)c);
1686 if (uio->uio_resid == 0)
1689 * In canonical mode check for a "break character"
1690 * marking the end of a "line of input".
1692 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1699 * Look to unblock input now that (presumably)
1700 * the input queue has gone down.
1703 if (ISSET(tp->t_state, TS_TBLOCK) &&
1704 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1712 * Check the output queue on tp for space for a kernel message (from uprintf
1713 * or tprintf). Allow some space over the normal hiwater mark so we don't
1714 * lose messages due to normal flow control, but don't let the tty run amok.
1715 * Sleeps here are not interruptible, but we return prematurely if new signals
1719 ttycheckoutq(tp, wait)
1720 register struct tty *tp;
1723 int hiwat, s, oldsig;
1725 hiwat = tp->t_ohiwat;
1727 oldsig = wait ? curproc->p_siglist : 0;
1728 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1729 while (tp->t_outq.c_cc > hiwat) {
1731 if (tp->t_outq.c_cc <= hiwat)
1733 if (wait == 0 || curproc->p_siglist != oldsig) {
1737 SET(tp->t_state, TS_SO_OLOWAT);
1738 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1745 * Process a write call on a tty device.
1748 ttwrite(tp, uio, flag)
1749 register struct tty *tp;
1750 register struct uio *uio;
1753 register char *cp = NULL;
1754 register int cc, ce;
1755 register struct proc *p;
1756 int i, hiwat, cnt, error, s;
1759 hiwat = tp->t_ohiwat;
1760 cnt = uio->uio_resid;
1765 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1767 if (uio->uio_resid == cnt)
1771 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1772 if (flag & IO_NDELAY) {
1774 error = EWOULDBLOCK;
1777 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1786 * Hang the process if it's in the background.
1789 if (isbackground(p, tp) &&
1790 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
1791 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
1792 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
1793 if (p->p_pgrp->pg_jobc == 0) {
1797 pgsignal(p->p_pgrp, SIGTTOU, 1);
1798 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1804 * Process the user's data in at most OBUFSIZ chunks. Perform any
1805 * output translation. Keep track of high water mark, sleep on
1806 * overflow awaiting device aid in acquiring new space.
1808 while (uio->uio_resid > 0 || cc > 0) {
1809 if (ISSET(tp->t_lflag, FLUSHO)) {
1813 if (tp->t_outq.c_cc > hiwat)
1816 * Grab a hunk of data from the user, unless we have some
1817 * leftover from last time.
1820 cc = imin(uio->uio_resid, OBUFSIZ);
1822 error = uiomove(cp, cc, uio);
1828 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1829 snpin((struct snoop *)tp->t_sc, cp, cc);
1833 * If nothing fancy need be done, grab those characters we
1834 * can handle without any of ttyoutput's processing and
1835 * just transfer them to the output q. For those chars
1836 * which require special processing (as indicated by the
1837 * bits in char_type), call ttyoutput. After processing
1838 * a hunk of data, look for FLUSHO so ^O's will take effect
1842 if (!ISSET(tp->t_oflag, OPOST))
1845 ce = cc - scanc((u_int)cc, (u_char *)cp,
1846 char_type, CCLASSMASK);
1848 * If ce is zero, then we're processing
1849 * a special character through ttyoutput.
1853 if (ttyoutput(*cp, tp) >= 0) {
1854 /* No Clists, wait a bit. */
1856 if (flag & IO_NDELAY) {
1857 error = EWOULDBLOCK;
1860 error = ttysleep(tp, &lbolt,
1869 if (ISSET(tp->t_lflag, FLUSHO) ||
1870 tp->t_outq.c_cc > hiwat)
1876 * A bunch of normal characters have been found.
1877 * Transfer them en masse to the output queue and
1878 * continue processing at the top of the loop.
1879 * If there are any further characters in this
1880 * <= OBUFSIZ chunk, the first should be a character
1881 * requiring special handling by ttyoutput.
1884 i = b_to_q(cp, ce, &tp->t_outq);
1887 cp += ce, cc -= ce, tk_nout += ce;
1890 /* No Clists, wait a bit. */
1892 if (flag & IO_NDELAY) {
1893 error = EWOULDBLOCK;
1896 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1902 if (ISSET(tp->t_lflag, FLUSHO) ||
1903 tp->t_outq.c_cc > hiwat)
1910 * If cc is nonzero, we leave the uio structure inconsistent, as the
1911 * offset and iov pointers have moved forward, but it doesn't matter
1912 * (the call will either return short or restart with a new uio).
1914 uio->uio_resid += cc;
1921 * This can only occur if FLUSHO is set in t_lflag,
1922 * or if ttstart/oproc is synchronous (or very fast).
1924 if (tp->t_outq.c_cc <= hiwat) {
1928 if (flag & IO_NDELAY) {
1930 uio->uio_resid += cc;
1931 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1933 SET(tp->t_state, TS_SO_OLOWAT);
1934 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1937 if (error == EWOULDBLOCK)
1945 * Rubout one character from the rawq of tp
1946 * as cleanly as possible.
1951 register struct tty *tp;
1954 register int savecol;
1957 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
1959 CLR(tp->t_lflag, FLUSHO);
1960 if (ISSET(tp->t_lflag, ECHOE)) {
1961 if (tp->t_rocount == 0) {
1963 * Screwed by ttwrite; retype
1968 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
1971 CLR(c, ~TTY_CHARMASK);
1972 switch (CCLASS(c)) {
1981 if (ISSET(tp->t_lflag, ECHOCTL))
1985 if (tp->t_rocount < tp->t_rawq.c_cc) {
1990 savecol = tp->t_column;
1991 SET(tp->t_state, TS_CNTTB);
1992 SET(tp->t_lflag, FLUSHO);
1993 tp->t_column = tp->t_rocol;
1994 cp = tp->t_rawq.c_cf;
1996 tabc = *cp; /* XXX FIX NEXTC */
1997 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
1999 CLR(tp->t_lflag, FLUSHO);
2000 CLR(tp->t_state, TS_CNTTB);
2003 /* savecol will now be length of the tab. */
2004 savecol -= tp->t_column;
2005 tp->t_column += savecol;
2007 savecol = 8; /* overflow screw */
2008 while (--savecol >= 0)
2009 (void)ttyoutput('\b', tp);
2012 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2013 (void)printf(PANICSTR, c, CCLASS(c));
2015 panic(PANICSTR, c, CCLASS(c));
2019 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2020 if (!ISSET(tp->t_state, TS_ERASE)) {
2021 SET(tp->t_state, TS_ERASE);
2022 (void)ttyoutput('\\', tp);
2026 ttyecho(tp->t_cc[VERASE], tp);
2031 * Back over cnt characters, erasing them.
2035 register struct tty *tp;
2040 (void)ttyoutput('\b', tp);
2041 (void)ttyoutput(' ', tp);
2042 (void)ttyoutput('\b', tp);
2048 * Reprint the rawq line. Note, it is assumed that c_cc has already
2053 register struct tty *tp;
2058 /* Echo the reprint character. */
2059 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2060 ttyecho(tp->t_cc[VREPRINT], tp);
2062 (void)ttyoutput('\n', tp);
2066 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2067 * BIT OF FIRST CHAR.
2070 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2071 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2073 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2074 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2076 CLR(tp->t_state, TS_ERASE);
2079 tp->t_rocount = tp->t_rawq.c_cc;
2084 * Echo a typed character to the terminal.
2089 register struct tty *tp;
2092 if (!ISSET(tp->t_state, TS_CNTTB))
2093 CLR(tp->t_lflag, FLUSHO);
2094 if ((!ISSET(tp->t_lflag, ECHO) &&
2095 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2096 ISSET(tp->t_lflag, EXTPROC))
2098 if (ISSET(tp->t_lflag, ECHOCTL) &&
2099 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2100 ISSET(c, TTY_CHARMASK) == 0177)) {
2101 (void)ttyoutput('^', tp);
2102 CLR(c, ~TTY_CHARMASK);
2108 (void)ttyoutput(c, tp);
2112 * Wake up any readers on a tty.
2116 register struct tty *tp;
2119 if (tp->t_rsel.si_pid != 0)
2120 selwakeup(&tp->t_rsel);
2121 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2122 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2123 wakeup(TSA_HUP_OR_INPUT(tp));
2127 * Wake up any writers on a tty.
2131 register struct tty *tp;
2134 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2135 selwakeup(&tp->t_wsel);
2136 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2137 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2138 CLR(tp->t_state, TS_SO_OCOMPLETE);
2139 wakeup(TSA_OCOMPLETE(tp));
2141 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2142 tp->t_outq.c_cc <= tp->t_olowat) {
2143 CLR(tp->t_state, TS_SO_OLOWAT);
2144 wakeup(TSA_OLOWAT(tp));
2149 * Look up a code for a specified speed in a conversion table;
2150 * used by drivers to map software speed values to hardware parameters.
2153 ttspeedtab(speed, table)
2155 register struct speedtab *table;
2158 for ( ; table->sp_speed != -1; table++)
2159 if (table->sp_speed == speed)
2160 return (table->sp_code);
2165 * Set input and output watermarks and buffer sizes. For input, the
2166 * high watermark is about one second's worth of input above empty, the
2167 * low watermark is slightly below high water, and the buffer size is a
2168 * driver-dependent amount above high water. For output, the watermarks
2169 * are near the ends of the buffer, with about 1 second's worth of input
2170 * between them. All this only applies to the standard line discipline.
2176 register int cps, ttmaxhiwat, x;
2179 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2180 switch (tp->t_ispeedwat) {
2182 cps = tp->t_ispeed / 10;
2186 * This case is for old drivers that don't know about
2187 * t_ispeedwat. Arrange for them to get the old buffer
2188 * sizes and watermarks.
2190 cps = TTYHOG - 2 * 256;
2191 tp->t_ififosize = 2 * 256;
2194 cps = tp->t_ispeedwat / 10;
2198 tp->t_ilowat = 7 * cps / 8;
2199 x = cps + tp->t_ififosize;
2200 clist_alloc_cblocks(&tp->t_rawq, x, x);
2203 switch (tp->t_ospeedwat) {
2205 cps = tp->t_ospeed / 10;
2206 ttmaxhiwat = 2 * TTMAXHIWAT;
2209 cps = tp->t_ospeed / 10;
2210 ttmaxhiwat = TTMAXHIWAT;
2213 cps = tp->t_ospeedwat / 10;
2214 ttmaxhiwat = 8 * TTMAXHIWAT;
2217 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2218 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2220 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2221 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2222 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2224 clist_alloc_cblocks(&tp->t_outq, x, x);
2229 * Report on state of foreground process group.
2233 register struct tty *tp;
2235 register struct proc *p, *pick;
2236 struct timeval utime, stime;
2239 if (ttycheckoutq(tp,0) == 0)
2242 /* Print load average. */
2243 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2244 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2246 if (tp->t_session == NULL)
2247 ttyprintf(tp, "not a controlling terminal\n");
2248 else if (tp->t_pgrp == NULL)
2249 ttyprintf(tp, "no foreground process group\n");
2250 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0)
2251 ttyprintf(tp, "empty foreground process group\n");
2253 /* Pick interesting process. */
2254 for (pick = NULL; p != 0; p = p->p_pglist.le_next)
2255 if (proc_compare(pick, p))
2258 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2259 pick->p_stat == SRUN ? "running" :
2260 pick->p_wmesg ? pick->p_wmesg : "iowait");
2262 calcru(pick, &utime, &stime, NULL);
2264 /* Print user time. */
2265 ttyprintf(tp, "%ld.%02ldu ",
2266 utime.tv_sec, utime.tv_usec / 10000);
2268 /* Print system time. */
2269 ttyprintf(tp, "%ld.%02lds ",
2270 stime.tv_sec, stime.tv_usec / 10000);
2272 #define pgtok(a) (((a) * PAGE_SIZE) / 1024)
2273 /* Print percentage cpu, resident set size. */
2274 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2275 ttyprintf(tp, "%d%% %ldk\n",
2277 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2278 #ifdef pmap_resident_count
2279 (long)pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap))
2281 (long)pgtok(pick->p_vmspace->vm_rssize)
2285 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2289 * Returns 1 if p2 is "better" than p1
2291 * The algorithm for picking the "interesting" process is thus:
2293 * 1) Only foreground processes are eligible - implied.
2294 * 2) Runnable processes are favored over anything else. The runner
2295 * with the highest cpu utilization is picked (p_estcpu). Ties are
2296 * broken by picking the highest pid.
2297 * 3) The sleeper with the shortest sleep time is next. With ties,
2298 * we pick out just "short-term" sleepers (P_SINTR == 0).
2299 * 4) Further ties are broken by picking the highest pid.
2301 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2302 #define TESTAB(a, b) ((a)<<1 | (b))
2308 proc_compare(p1, p2)
2309 register struct proc *p1, *p2;
2315 * see if at least one of them is runnable
2317 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2324 * tie - favor one with highest recent cpu utilization
2326 if (p2->p_estcpu > p1->p_estcpu)
2328 if (p1->p_estcpu > p2->p_estcpu)
2330 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2335 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2341 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2344 * pick the one with the smallest sleep time
2346 if (p2->p_slptime > p1->p_slptime)
2348 if (p1->p_slptime > p2->p_slptime)
2351 * favor one sleeping in a non-interruptible sleep
2353 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2355 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2357 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2361 * Output char to tty; console putchar style.
2371 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2376 (void)ttyoutput('\r', tp);
2377 (void)ttyoutput(c, tp);
2384 * Sleep on chan, returning ERESTART if tty changed while we napped and
2385 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2386 * the tty is revoked, restarting a pending call will redo validation done
2387 * at the start of the call.
2390 ttysleep(tp, chan, pri, wmesg, timo)
2400 error = tsleep(chan, pri, wmesg, timo);
2403 return (tp->t_gen == gen ? 0 : ERESTART);
2408 * XXX this is usable not useful or used. Most tty drivers have
2409 * ifdefs for using ttymalloc() but assume a different interface.
2412 * Allocate a tty struct. Clists in the struct will be allocated by
2420 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2421 bzero(tp, sizeof *tp);
2426 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2428 * Free a tty struct. Clists in the struct should have been freed by