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
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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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 1.5 2003/07/19 21:14:39 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(struct tty *tp, u_long cmd, void *data, int flag)
705 struct thread *td = curthread;
706 struct proc *p = td->td_proc;
711 /* If the ioctl involves modification, hang if in the background. */
735 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
745 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
746 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
747 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
748 if (p->p_pgrp->pg_jobc == 0)
750 pgsignal(p->p_pgrp, SIGTTOU, 1);
751 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
759 switch (cmd) { /* Process the ioctl. */
760 case FIOASYNC: /* set/clear async i/o */
763 SET(tp->t_state, TS_ASYNC);
765 CLR(tp->t_state, TS_ASYNC);
768 case FIONBIO: /* set/clear non-blocking i/o */
769 break; /* XXX: delete. */
770 case FIONREAD: /* get # bytes to read */
772 *(int *)data = ttnread(tp);
778 * Policy -- Don't allow FIOSETOWN on someone else's
781 if (tp->t_session != NULL && !isctty(p, tp))
784 error = fsetown(*(int *)data, &tp->t_sigio);
789 if (tp->t_session != NULL && !isctty(p, tp))
791 *(int *)data = fgetown(tp->t_sigio);
794 case TIOCEXCL: /* set exclusive use of tty */
796 SET(tp->t_state, TS_XCLUDE);
799 case TIOCFLUSH: { /* flush buffers */
800 register int flags = *(int *)data;
803 flags = FREAD | FWRITE;
805 flags &= FREAD | FWRITE;
809 case TIOCCONS: /* become virtual console */
811 if (constty && constty != tp &&
812 ISSET(constty->t_state, TS_CONNECTED))
815 if ((error = suser(td)) != 0)
819 } else if (tp == constty)
822 case TIOCDRAIN: /* wait till output drained */
827 case TIOCGETA: { /* get termios struct */
828 struct termios *t = (struct termios *)data;
830 bcopy(&tp->t_termios, t, sizeof(struct termios));
833 case TIOCGETD: /* get line discipline */
834 *(int *)data = tp->t_line;
836 case TIOCGWINSZ: /* get window size */
837 *(struct winsize *)data = tp->t_winsize;
839 case TIOCGPGRP: /* get pgrp of tty */
842 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
845 case TIOCHPCL: /* hang up on last close */
847 SET(tp->t_cflag, HUPCL);
851 case TIOCNXCL: /* reset exclusive use of tty */
853 CLR(tp->t_state, TS_XCLUDE);
856 case TIOCOUTQ: /* output queue size */
857 *(int *)data = tp->t_outq.c_cc;
859 case TIOCSETA: /* set termios struct */
860 case TIOCSETAW: /* drain output, set */
861 case TIOCSETAF: { /* drn out, fls in, set */
862 register struct termios *t = (struct termios *)data;
864 if (t->c_ispeed == 0)
865 t->c_ispeed = t->c_ospeed;
866 if (t->c_ispeed == 0)
867 t->c_ispeed = tp->t_ospeed;
868 if (t->c_ispeed == 0)
871 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
877 if (cmd == TIOCSETAF)
880 if (!ISSET(t->c_cflag, CIGNORE)) {
882 * Set device hardware.
884 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
888 if (ISSET(t->c_cflag, CLOCAL) &&
889 !ISSET(tp->t_cflag, CLOCAL)) {
891 * XXX disconnections would be too hard to
892 * get rid of without this kludge. The only
893 * way to get rid of controlling terminals
894 * is to exit from the session leader.
896 CLR(tp->t_state, TS_ZOMBIE);
898 wakeup(TSA_CARR_ON(tp));
902 if ((ISSET(tp->t_state, TS_CARR_ON) ||
903 ISSET(t->c_cflag, CLOCAL)) &&
904 !ISSET(tp->t_state, TS_ZOMBIE))
905 SET(tp->t_state, TS_CONNECTED);
907 CLR(tp->t_state, TS_CONNECTED);
908 tp->t_cflag = t->c_cflag;
909 tp->t_ispeed = t->c_ispeed;
910 if (t->c_ospeed != 0)
911 tp->t_ospeed = t->c_ospeed;
914 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
916 if (ISSET(t->c_lflag, ICANON))
917 SET(tp->t_lflag, PENDIN);
920 * XXX we really shouldn't allow toggling
921 * ICANON while we're in a non-termios line
922 * discipline. Now we have to worry about
923 * panicing for a null queue.
925 if (tp->t_canq.c_cbreserved > 0 &&
926 tp->t_rawq.c_cbreserved > 0) {
927 catq(&tp->t_rawq, &tp->t_canq);
929 * XXX the queue limits may be
930 * different, so the old queue
931 * swapping method no longer works.
933 catq(&tp->t_canq, &tp->t_rawq);
935 CLR(tp->t_lflag, PENDIN);
939 tp->t_iflag = t->c_iflag;
940 tp->t_oflag = t->c_oflag;
942 * Make the EXTPROC bit read only.
944 if (ISSET(tp->t_lflag, EXTPROC))
945 SET(t->c_lflag, EXTPROC);
947 CLR(t->c_lflag, EXTPROC);
948 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
949 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
950 t->c_cc[VTIME] != tp->t_cc[VTIME])
952 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
956 case TIOCSETD: { /* set line discipline */
957 register int t = *(int *)data;
958 dev_t device = tp->t_dev;
960 if ((u_int)t >= nlinesw)
962 if (t != tp->t_line) {
964 (*linesw[tp->t_line].l_close)(tp, flag);
965 error = (*linesw[t].l_open)(device, tp);
967 (void)(*linesw[tp->t_line].l_open)(device, tp);
976 case TIOCSTART: /* start output, like ^Q */
978 if (ISSET(tp->t_state, TS_TTSTOP) ||
979 ISSET(tp->t_lflag, FLUSHO)) {
980 CLR(tp->t_lflag, FLUSHO);
981 CLR(tp->t_state, TS_TTSTOP);
986 case TIOCSTI: /* simulate terminal input */
987 if ((flag & FREAD) == 0 && suser(td))
989 if (!isctty(p, tp) && suser(td))
992 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
995 case TIOCSTOP: /* stop output, like ^S */
997 if (!ISSET(tp->t_state, TS_TTSTOP)) {
998 SET(tp->t_state, TS_TTSTOP);
999 (*tp->t_stop)(tp, 0);
1003 case TIOCSCTTY: /* become controlling tty */
1004 /* Session ctty vnode pointer set in vnode layer. */
1005 if (!SESS_LEADER(p) ||
1006 ((p->p_session->s_ttyvp || tp->t_session) &&
1007 (tp->t_session != p->p_session)))
1009 tp->t_session = p->p_session;
1010 tp->t_pgrp = p->p_pgrp;
1011 p->p_session->s_ttyp = tp;
1012 p->p_flag |= P_CONTROLT;
1014 case TIOCSPGRP: { /* set pgrp of tty */
1015 register struct pgrp *pgrp = pgfind(*(int *)data);
1019 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1024 case TIOCSTAT: /* simulate control-T */
1029 case TIOCSWINSZ: /* set window size */
1030 if (bcmp((caddr_t)&tp->t_winsize, data,
1031 sizeof (struct winsize))) {
1032 tp->t_winsize = *(struct winsize *)data;
1033 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1036 case TIOCSDRAINWAIT:
1040 tp->t_timeout = *(int *)data * hz;
1041 wakeup(TSA_OCOMPLETE(tp));
1042 wakeup(TSA_OLOWAT(tp));
1044 case TIOCGDRAINWAIT:
1045 *(int *)data = tp->t_timeout / hz;
1048 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1049 return (ttcompat(tp, cmd, data, flag));
1058 ttypoll(dev, events, td)
1068 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1069 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1073 if (events & (POLLIN | POLLRDNORM)) {
1074 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1075 revents |= events & (POLLIN | POLLRDNORM);
1077 selrecord(td, &tp->t_rsel);
1079 if (events & (POLLOUT | POLLWRNORM)) {
1080 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1081 ISSET(tp->t_state, TS_CONNECTED))
1082 || ISSET(tp->t_state, TS_ZOMBIE))
1083 revents |= events & (POLLOUT | POLLWRNORM);
1085 selrecord(td, &tp->t_wsel);
1091 static struct filterops ttyread_filtops =
1092 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1093 static struct filterops ttywrite_filtops =
1094 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1097 ttykqfilter(dev, kn)
1101 struct tty *tp = dev->si_tty;
1102 struct klist *klist;
1105 switch (kn->kn_filter) {
1107 klist = &tp->t_rsel.si_note;
1108 kn->kn_fop = &ttyread_filtops;
1111 klist = &tp->t_wsel.si_note;
1112 kn->kn_fop = &ttywrite_filtops;
1118 kn->kn_hook = (caddr_t)dev;
1121 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1128 filt_ttyrdetach(struct knote *kn)
1130 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1133 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1138 filt_ttyread(struct knote *kn, long hint)
1140 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1142 kn->kn_data = ttnread(tp);
1143 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1144 kn->kn_flags |= EV_EOF;
1147 return (kn->kn_data > 0);
1151 filt_ttywdetach(struct knote *kn)
1153 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1156 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1161 filt_ttywrite(kn, hint)
1165 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1167 kn->kn_data = tp->t_outq.c_cc;
1168 if (ISSET(tp->t_state, TS_ZOMBIE))
1170 return (kn->kn_data <= tp->t_olowat &&
1171 ISSET(tp->t_state, TS_CONNECTED));
1175 * Must be called at spltty().
1183 if (ISSET(tp->t_lflag, PENDIN))
1185 nread = tp->t_canq.c_cc;
1186 if (!ISSET(tp->t_lflag, ICANON)) {
1187 nread += tp->t_rawq.c_cc;
1188 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1195 * Wait for output to drain.
1199 register struct tty *tp;
1205 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1206 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1208 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1209 ISSET(tp->t_state, TS_CONNECTED)) {
1210 SET(tp->t_state, TS_SO_OCOMPLETE);
1211 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1215 if (error == EWOULDBLOCK)
1222 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1229 * Flush if successfully wait.
1237 if ((error = ttywait(tp)) == 0)
1238 ttyflush(tp, FREAD);
1243 * Flush tty read and/or write queues, notifying anyone waiting.
1247 register struct tty *tp;
1257 FLUSHQ(&tp->t_outq);
1258 CLR(tp->t_state, TS_TTSTOP);
1260 (*tp->t_stop)(tp, rw);
1262 FLUSHQ(&tp->t_canq);
1263 FLUSHQ(&tp->t_rawq);
1264 CLR(tp->t_lflag, PENDIN);
1267 CLR(tp->t_state, TS_LOCAL);
1269 if (ISSET(tp->t_state, TS_TBLOCK)) {
1271 FLUSHQ(&tp->t_outq);
1275 * Don't let leave any state that might clobber the
1276 * next line discipline (although we should do more
1277 * to send the START char). Not clearing the state
1278 * may have caused the "putc to a clist with no
1279 * reserved cblocks" panic/printf.
1281 CLR(tp->t_state, TS_TBLOCK);
1283 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1284 if (ISSET(tp->t_iflag, IXOFF)) {
1286 * XXX wait a bit in the hope that the stop
1287 * character (if any) will go out. Waiting
1288 * isn't good since it allows races. This
1289 * will be fixed when the stop character is
1290 * put in a special queue. Don't bother with
1291 * the checks in ttywait() since the timeout
1294 SET(tp->t_state, TS_SO_OCOMPLETE);
1295 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1298 * Don't try sending the stop character again.
1300 CLR(tp->t_state, TS_TBLOCK);
1307 FLUSHQ(&tp->t_outq);
1314 * Copy in the default termios characters.
1321 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1332 termioschars(&tp->t_termios);
1336 * Handle input high water. Send stop character for the IXOFF case. Turn
1337 * on our input flow control bit and propagate the changes to the driver.
1338 * XXX the stop character should be put in a special high priority queue.
1345 SET(tp->t_state, TS_TBLOCK);
1346 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1347 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1348 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1353 * Handle input low water. Send start character for the IXOFF case. Turn
1354 * off our input flow control bit and propagate the changes to the driver.
1355 * XXX the start character should be put in a special high priority queue.
1362 CLR(tp->t_state, TS_TBLOCK);
1363 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1364 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1365 SET(tp->t_state, TS_TBLOCK); /* try again later */
1370 /* Not used by any current (i386) drivers. */
1372 * Restart after an inter-char delay.
1381 KASSERT(tp_arg != NULL, ("ttrstrt"));
1386 CLR(tp->t_state, TS_TIMEOUT);
1398 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1404 * "close" a line discipline
1412 if (flag & FNONBLOCK || ttywflush(tp))
1413 ttyflush(tp, FREAD | FWRITE);
1418 * Handle modem control transition on a tty.
1419 * Flag indicates new state of carrier.
1420 * Returns 0 if the line should be turned off, otherwise 1.
1424 register struct tty *tp;
1428 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1430 * MDMBUF: do flow control according to carrier flag
1431 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1432 * works if IXON and IXANY are clear.
1435 CLR(tp->t_state, TS_CAR_OFLOW);
1436 CLR(tp->t_state, TS_TTSTOP);
1438 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1439 SET(tp->t_state, TS_CAR_OFLOW);
1440 SET(tp->t_state, TS_TTSTOP);
1441 (*tp->t_stop)(tp, 0);
1443 } else if (flag == 0) {
1447 CLR(tp->t_state, TS_CARR_ON);
1448 if (ISSET(tp->t_state, TS_ISOPEN) &&
1449 !ISSET(tp->t_cflag, CLOCAL)) {
1450 SET(tp->t_state, TS_ZOMBIE);
1451 CLR(tp->t_state, TS_CONNECTED);
1452 if (tp->t_session && tp->t_session->s_leader)
1453 psignal(tp->t_session->s_leader, SIGHUP);
1454 ttyflush(tp, FREAD | FWRITE);
1461 SET(tp->t_state, TS_CARR_ON);
1462 if (!ISSET(tp->t_state, TS_ZOMBIE))
1463 SET(tp->t_state, TS_CONNECTED);
1464 wakeup(TSA_CARR_ON(tp));
1472 * Reinput pending characters after state switch
1477 register struct tty *tp;
1482 CLR(tp->t_lflag, PENDIN);
1483 SET(tp->t_state, TS_TYPEN);
1485 * XXX this assumes too much about clist internals. It may even
1486 * fail if the cblock slush pool is empty. We can't allocate more
1487 * cblocks here because we are called from an interrupt handler
1488 * and clist_alloc_cblocks() can wait.
1491 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1492 tp->t_rawq.c_cbmax = tq.c_cbmax;
1493 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1494 while ((c = getc(&tq)) >= 0)
1496 CLR(tp->t_state, TS_TYPEN);
1500 * Process a read call on a tty device.
1503 ttread(tp, uio, flag)
1504 register struct tty *tp;
1508 register struct clist *qp;
1510 register tcflag_t lflag;
1511 register cc_t *cc = tp->t_cc;
1512 register struct proc *p = curproc;
1513 int s, first, error = 0;
1514 int has_stime = 0, last_cc = 0;
1515 long slp = 0; /* XXX this should be renamed `timo'. */
1516 struct timeval stime;
1520 lflag = tp->t_lflag;
1522 * take pending input first
1524 if (ISSET(lflag, PENDIN)) {
1526 splx(s); /* reduce latency */
1528 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1532 * Hang process if it's in the background.
1534 if (isbackground(p, tp)) {
1536 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1537 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1538 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1540 pgsignal(p->p_pgrp, SIGTTIN, 1);
1541 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1547 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1549 return (0); /* EOF */
1553 * If canonical, use the canonical queue,
1554 * else use the raw queue.
1556 * (should get rid of clists...)
1558 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1560 if (flag & IO_NDELAY) {
1563 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1568 return (EWOULDBLOCK);
1570 if (!ISSET(lflag, ICANON)) {
1573 struct timeval timecopy;
1576 * Check each of the four combinations.
1577 * (m > 0 && t == 0) is the normal read case.
1578 * It should be fairly efficient, so we check that and its
1579 * companion case (m == 0 && t == 0) first.
1580 * For the other two cases, we compute the target sleep time
1589 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1593 t *= 100000; /* time in us */
1594 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1595 ((t1).tv_usec - (t2).tv_usec))
1601 getmicrotime(&timecopy);
1603 /* first character, start timer */
1607 } else if (qp->c_cc > last_cc) {
1608 /* got a character, restart timer */
1612 /* nothing, check expiration */
1613 slp = t - diff(timecopy, stime);
1618 } else { /* m == 0 */
1621 getmicrotime(&timecopy);
1627 slp = t - diff(timecopy, stime);
1629 /* Timed out, but 0 is enough input. */
1637 * Rounding down may make us wake up just short
1638 * of the target, so we round up.
1639 * The formula is ceiling(slp * hz/1000000).
1640 * 32-bit arithmetic is enough for hz < 169.
1641 * XXX see tvtohz() for how to avoid overflow if hz
1642 * is large (divide by `tick' and/or arrange to
1643 * use tvtohz() if hz is large).
1645 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1648 if (qp->c_cc <= 0) {
1651 * There is no input, or not enough input and we can block.
1653 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1654 ISSET(tp->t_state, TS_CONNECTED) ?
1655 "ttyin" : "ttyhup", (int)slp);
1657 if (error == EWOULDBLOCK)
1662 * XXX what happens if another process eats some input
1663 * while we are asleep (not just here)? It would be
1664 * safest to detect changes and reset our state variables
1665 * (has_stime and last_cc).
1673 * Input present, check for input mapping and processing.
1676 if (ISSET(lflag, ICANON | ISIG))
1682 icc = imin(uio->uio_resid, IBUFSIZ);
1683 icc = q_to_b(qp, ibuf, icc);
1689 error = uiomove(ibuf, icc, uio);
1691 * XXX if there was an error then we should ungetc() the
1692 * unmoved chars and reduce icc here.
1696 if (uio->uio_resid == 0)
1710 * delayed suspend (^Y)
1712 if (CCEQ(cc[VDSUSP], c) &&
1713 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1714 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1716 error = ttysleep(tp, &lbolt, PCATCH,
1725 * Interpret EOF only in canonical mode.
1727 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1730 * Give user character.
1732 error = ureadc(c, uio);
1734 /* XXX should ungetc(c, qp). */
1736 if (uio->uio_resid == 0)
1739 * In canonical mode check for a "break character"
1740 * marking the end of a "line of input".
1742 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1749 * Look to unblock input now that (presumably)
1750 * the input queue has gone down.
1753 if (ISSET(tp->t_state, TS_TBLOCK) &&
1754 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1762 * Check the output queue on tp for space for a kernel message (from uprintf
1763 * or tprintf). Allow some space over the normal hiwater mark so we don't
1764 * lose messages due to normal flow control, but don't let the tty run amok.
1765 * Sleeps here are not interruptible, but we return prematurely if new signals
1769 ttycheckoutq(tp, wait)
1770 register struct tty *tp;
1776 hiwat = tp->t_ohiwat;
1777 SIGEMPTYSET(oldmask);
1780 oldmask = curproc->p_siglist;
1781 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1782 while (tp->t_outq.c_cc > hiwat) {
1784 if (tp->t_outq.c_cc <= hiwat)
1786 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1790 SET(tp->t_state, TS_SO_OLOWAT);
1791 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1798 * Process a write call on a tty device.
1801 ttwrite(tp, uio, flag)
1802 register struct tty *tp;
1803 register struct uio *uio;
1806 register char *cp = NULL;
1807 register int cc, ce;
1808 register struct proc *p;
1809 int i, hiwat, cnt, error, s;
1812 hiwat = tp->t_ohiwat;
1813 cnt = uio->uio_resid;
1818 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1820 if (uio->uio_resid == cnt)
1824 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1825 if (flag & IO_NDELAY) {
1827 error = EWOULDBLOCK;
1830 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1838 * Hang the process if it's in the background.
1841 if (isbackground(p, tp) &&
1842 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1843 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1844 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1845 if (p->p_pgrp->pg_jobc == 0) {
1849 pgsignal(p->p_pgrp, SIGTTOU, 1);
1850 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1856 * Process the user's data in at most OBUFSIZ chunks. Perform any
1857 * output translation. Keep track of high water mark, sleep on
1858 * overflow awaiting device aid in acquiring new space.
1860 while (uio->uio_resid > 0 || cc > 0) {
1861 if (ISSET(tp->t_lflag, FLUSHO)) {
1865 if (tp->t_outq.c_cc > hiwat)
1868 * Grab a hunk of data from the user, unless we have some
1869 * leftover from last time.
1872 cc = imin(uio->uio_resid, OBUFSIZ);
1874 error = uiomove(cp, cc, uio);
1881 * If nothing fancy need be done, grab those characters we
1882 * can handle without any of ttyoutput's processing and
1883 * just transfer them to the output q. For those chars
1884 * which require special processing (as indicated by the
1885 * bits in char_type), call ttyoutput. After processing
1886 * a hunk of data, look for FLUSHO so ^O's will take effect
1890 if (!ISSET(tp->t_oflag, OPOST))
1893 ce = cc - scanc((u_int)cc, (u_char *)cp,
1894 char_type, CCLASSMASK);
1896 * If ce is zero, then we're processing
1897 * a special character through ttyoutput.
1901 if (ttyoutput(*cp, tp) >= 0) {
1902 /* No Clists, wait a bit. */
1904 if (flag & IO_NDELAY) {
1905 error = EWOULDBLOCK;
1908 error = ttysleep(tp, &lbolt,
1917 if (ISSET(tp->t_lflag, FLUSHO) ||
1918 tp->t_outq.c_cc > hiwat)
1924 * A bunch of normal characters have been found.
1925 * Transfer them en masse to the output queue and
1926 * continue processing at the top of the loop.
1927 * If there are any further characters in this
1928 * <= OBUFSIZ chunk, the first should be a character
1929 * requiring special handling by ttyoutput.
1932 i = b_to_q(cp, ce, &tp->t_outq);
1935 cp += ce, cc -= ce, tk_nout += ce;
1938 /* No Clists, wait a bit. */
1940 if (flag & IO_NDELAY) {
1941 error = EWOULDBLOCK;
1944 error = ttysleep(tp, &lbolt, PCATCH,
1950 if (ISSET(tp->t_lflag, FLUSHO) ||
1951 tp->t_outq.c_cc > hiwat)
1958 * If cc is nonzero, we leave the uio structure inconsistent, as the
1959 * offset and iov pointers have moved forward, but it doesn't matter
1960 * (the call will either return short or restart with a new uio).
1962 uio->uio_resid += cc;
1969 * This can only occur if FLUSHO is set in t_lflag,
1970 * or if ttstart/oproc is synchronous (or very fast).
1972 if (tp->t_outq.c_cc <= hiwat) {
1976 if (flag & IO_NDELAY) {
1978 uio->uio_resid += cc;
1979 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1981 SET(tp->t_state, TS_SO_OLOWAT);
1982 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
1984 if (error == EWOULDBLOCK)
1992 * Rubout one character from the rawq of tp
1993 * as cleanly as possible.
1998 register struct tty *tp;
2001 register int savecol;
2004 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2006 CLR(tp->t_lflag, FLUSHO);
2007 if (ISSET(tp->t_lflag, ECHOE)) {
2008 if (tp->t_rocount == 0) {
2010 * Screwed by ttwrite; retype
2015 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2018 CLR(c, ~TTY_CHARMASK);
2019 switch (CCLASS(c)) {
2028 if (ISSET(tp->t_lflag, ECHOCTL))
2032 if (tp->t_rocount < tp->t_rawq.c_cc) {
2037 savecol = tp->t_column;
2038 SET(tp->t_state, TS_CNTTB);
2039 SET(tp->t_lflag, FLUSHO);
2040 tp->t_column = tp->t_rocol;
2041 cp = tp->t_rawq.c_cf;
2043 tabc = *cp; /* XXX FIX NEXTC */
2044 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2046 CLR(tp->t_lflag, FLUSHO);
2047 CLR(tp->t_state, TS_CNTTB);
2050 /* savecol will now be length of the tab. */
2051 savecol -= tp->t_column;
2052 tp->t_column += savecol;
2054 savecol = 8; /* overflow screw */
2055 while (--savecol >= 0)
2056 (void)ttyoutput('\b', tp);
2059 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2060 (void)printf(PANICSTR, c, CCLASS(c));
2062 panic(PANICSTR, c, CCLASS(c));
2066 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2067 if (!ISSET(tp->t_state, TS_ERASE)) {
2068 SET(tp->t_state, TS_ERASE);
2069 (void)ttyoutput('\\', tp);
2073 ttyecho(tp->t_cc[VERASE], tp);
2075 * This code may be executed not only when an ERASE key
2076 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2077 * So, I didn't think it was worthwhile to pass the extra
2078 * information (which would need an extra parameter,
2079 * changing every call) needed to distinguish the ERASE2
2080 * case from the ERASE.
2087 * Back over cnt characters, erasing them.
2091 register struct tty *tp;
2096 (void)ttyoutput('\b', tp);
2097 (void)ttyoutput(' ', tp);
2098 (void)ttyoutput('\b', tp);
2104 * Reprint the rawq line. Note, it is assumed that c_cc has already
2109 register struct tty *tp;
2114 /* Echo the reprint character. */
2115 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2116 ttyecho(tp->t_cc[VREPRINT], tp);
2118 (void)ttyoutput('\n', tp);
2122 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2123 * BIT OF FIRST CHAR.
2126 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2127 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2129 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2130 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2132 CLR(tp->t_state, TS_ERASE);
2135 tp->t_rocount = tp->t_rawq.c_cc;
2140 * Echo a typed character to the terminal.
2145 register struct tty *tp;
2148 if (!ISSET(tp->t_state, TS_CNTTB))
2149 CLR(tp->t_lflag, FLUSHO);
2150 if ((!ISSET(tp->t_lflag, ECHO) &&
2151 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2152 ISSET(tp->t_lflag, EXTPROC))
2154 if (ISSET(tp->t_lflag, ECHOCTL) &&
2155 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2156 ISSET(c, TTY_CHARMASK) == 0177)) {
2157 (void)ttyoutput('^', tp);
2158 CLR(c, ~TTY_CHARMASK);
2164 (void)ttyoutput(c, tp);
2168 * Wake up any readers on a tty.
2172 register struct tty *tp;
2175 if (tp->t_rsel.si_pid != 0)
2176 selwakeup(&tp->t_rsel);
2177 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2178 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2179 wakeup(TSA_HUP_OR_INPUT(tp));
2180 KNOTE(&tp->t_rsel.si_note, 0);
2184 * Wake up any writers on a tty.
2188 register struct tty *tp;
2191 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2192 selwakeup(&tp->t_wsel);
2193 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2194 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2195 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2196 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2197 CLR(tp->t_state, TS_SO_OCOMPLETE);
2198 wakeup(TSA_OCOMPLETE(tp));
2200 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2201 tp->t_outq.c_cc <= tp->t_olowat) {
2202 CLR(tp->t_state, TS_SO_OLOWAT);
2203 wakeup(TSA_OLOWAT(tp));
2205 KNOTE(&tp->t_wsel.si_note, 0);
2209 * Look up a code for a specified speed in a conversion table;
2210 * used by drivers to map software speed values to hardware parameters.
2213 ttspeedtab(speed, table)
2215 register struct speedtab *table;
2218 for ( ; table->sp_speed != -1; table++)
2219 if (table->sp_speed == speed)
2220 return (table->sp_code);
2225 * Set input and output watermarks and buffer sizes. For input, the
2226 * high watermark is about one second's worth of input above empty, the
2227 * low watermark is slightly below high water, and the buffer size is a
2228 * driver-dependent amount above high water. For output, the watermarks
2229 * are near the ends of the buffer, with about 1 second's worth of input
2230 * between them. All this only applies to the standard line discipline.
2236 register int cps, ttmaxhiwat, x;
2239 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2240 switch (tp->t_ispeedwat) {
2242 cps = tp->t_ispeed / 10;
2246 * This case is for old drivers that don't know about
2247 * t_ispeedwat. Arrange for them to get the old buffer
2248 * sizes and watermarks.
2250 cps = TTYHOG - 2 * 256;
2251 tp->t_ififosize = 2 * 256;
2254 cps = tp->t_ispeedwat / 10;
2258 tp->t_ilowat = 7 * cps / 8;
2259 x = cps + tp->t_ififosize;
2260 clist_alloc_cblocks(&tp->t_rawq, x, x);
2263 switch (tp->t_ospeedwat) {
2265 cps = tp->t_ospeed / 10;
2266 ttmaxhiwat = 2 * TTMAXHIWAT;
2269 cps = tp->t_ospeed / 10;
2270 ttmaxhiwat = TTMAXHIWAT;
2273 cps = tp->t_ospeedwat / 10;
2274 ttmaxhiwat = 8 * TTMAXHIWAT;
2277 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2278 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2280 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2281 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2282 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2284 clist_alloc_cblocks(&tp->t_outq, x, x);
2289 * Report on state of foreground process group.
2293 register struct tty *tp;
2295 register struct proc *p, *pick;
2296 struct timeval utime, stime;
2299 if (ttycheckoutq(tp,0) == 0)
2302 /* Print load average. */
2303 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2304 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2306 if (tp->t_session == NULL)
2307 ttyprintf(tp, "not a controlling terminal\n");
2308 else if (tp->t_pgrp == NULL)
2309 ttyprintf(tp, "no foreground process group\n");
2310 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0)
2311 ttyprintf(tp, "empty foreground process group\n");
2313 /* Pick interesting process. */
2314 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist))
2315 if (proc_compare(pick, p))
2318 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2319 pick->p_stat == SRUN ? "running" :
2320 pick->p_wmesg ? pick->p_wmesg : "iowait");
2322 if (pick->p_flag & P_INMEM) {
2323 calcru(pick, &utime, &stime, NULL);
2325 /* Print user time. */
2326 ttyprintf(tp, "%ld.%02ldu ",
2327 utime.tv_sec, utime.tv_usec / 10000);
2329 /* Print system time. */
2330 ttyprintf(tp, "%ld.%02lds ",
2331 stime.tv_sec, stime.tv_usec / 10000);
2333 ttyprintf(tp, "?.??u ?.??s ");
2335 /* Print percentage cpu, resident set size. */
2336 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2337 ttyprintf(tp, "%d%% %ldk\n",
2339 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2340 (long)pgtok(vmspace_resident_count(pick->p_vmspace)));
2342 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2346 * Returns 1 if p2 is "better" than p1
2348 * The algorithm for picking the "interesting" process is thus:
2350 * 1) Only foreground processes are eligible - implied.
2351 * 2) Runnable processes are favored over anything else. The runner
2352 * with the highest cpu utilization is picked (p_estcpu). Ties are
2353 * broken by picking the highest pid.
2354 * 3) The sleeper with the shortest sleep time is next. With ties,
2355 * we pick out just "short-term" sleepers (P_SINTR == 0).
2356 * 4) Further ties are broken by picking the highest pid.
2358 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2359 #define TESTAB(a, b) ((a)<<1 | (b))
2365 proc_compare(p1, p2)
2366 register struct proc *p1, *p2;
2372 * see if at least one of them is runnable
2374 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2381 * tie - favor one with highest recent cpu utilization
2383 if (p2->p_estcpu > p1->p_estcpu)
2385 if (p1->p_estcpu > p2->p_estcpu)
2387 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2392 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2398 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2401 * pick the one with the smallest sleep time
2403 if (p2->p_slptime > p1->p_slptime)
2405 if (p1->p_slptime > p2->p_slptime)
2408 * favor one sleeping in a non-interruptible sleep
2410 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2412 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2414 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2418 * Output char to tty; console putchar style.
2428 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2433 (void)ttyoutput('\r', tp);
2434 (void)ttyoutput(c, tp);
2441 * Sleep on chan, returning ERESTART if tty changed while we napped and
2442 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2443 * the tty is revoked, restarting a pending call will redo validation done
2444 * at the start of the call.
2447 ttysleep(tp, chan, slpflags, wmesg, timo)
2457 error = tsleep(chan, slpflags, wmesg, timo);
2460 return (tp->t_gen == gen ? 0 : ERESTART);
2464 * Allocate a tty struct. Clists in the struct will be allocated by
2474 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2475 bzero(tp, sizeof *tp);
2480 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2482 * Free a tty struct. Clists in the struct should have been freed by
2497 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2501 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2505 SLIST_FOREACH(tp, &tty_list, t_list) {
2508 t.t_dev = (dev_t)dev2udev(t.t_dev);
2509 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2516 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2517 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2529 ttyread(dev, uio, flag)
2539 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2543 ttywrite(dev, uio, flag)
2553 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));