2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
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20 * This product includes software developed by the University of
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34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
40 * $DragonFly: src/sys/kern/tty.c,v 1.18 2005/06/27 18:37:57 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>
83 #include <sys/clist.h>
85 #include <sys/fcntl.h>
87 #include <sys/dkstat.h>
89 #include <sys/kernel.h>
90 #include <sys/vnode.h>
91 #include <sys/signalvar.h>
92 #include <sys/resourcevar.h>
93 #include <sys/malloc.h>
94 #include <sys/filedesc.h>
95 #include <sys/sysctl.h>
96 #include <sys/thread2.h>
101 #include <vm/vm_map.h>
103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105 static int proc_compare (struct proc *p1, struct proc *p2);
106 static int ttnread (struct tty *tp);
107 static void ttyecho (int c, struct tty *tp);
108 static int ttyoutput (int c, struct tty *tp);
109 static void ttypend (struct tty *tp);
110 static void ttyretype (struct tty *tp);
111 static void ttyrub (int c, struct tty *tp);
112 static void ttyrubo (struct tty *tp, int cnt);
113 static void ttyunblock (struct tty *tp);
114 static int ttywflush (struct tty *tp);
115 static int filt_ttyread (struct knote *kn, long hint);
116 static void filt_ttyrdetach (struct knote *kn);
117 static int filt_ttywrite (struct knote *kn, long hint);
118 static void filt_ttywdetach (struct knote *kn);
121 * Table with character classes and parity. The 8th bit indicates parity,
122 * the 7th bit indicates the character is an alphameric or underscore (for
123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
124 * are 0 then the character needs no special processing on output; classes
125 * other than 0 might be translated or (not currently) require delays.
127 #define E 0x00 /* Even parity. */
128 #define O 0x80 /* Odd parity. */
129 #define PARITY(c) (char_type[c] & O)
131 #define ALPHA 0x40 /* Alpha or underscore. */
132 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
134 #define CCLASSMASK 0x3f
135 #define CCLASS(c) (char_type[c] & CCLASSMASK)
140 #define NA ORDINARY | ALPHA
146 static u_char const char_type[] = {
147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
164 * Meta chars; should be settable per character set;
165 * for now, treat them all as normal characters.
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,
181 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
193 /* Macros to clear/set/test flags. */
194 #define SET(t, f) (t) |= (f)
195 #define CLR(t, f) (t) &= ~(f)
196 #define ISSET(t, f) ((t) & (f))
198 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
199 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
202 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
203 "LU", "TTY input statistic");
205 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
206 "LU", "TTY output statistic");
210 * list of struct tty where pstat(8) can pick it up with sysctl
212 static SLIST_HEAD(, tty) tty_list;
215 * Initial open of tty, or (re)entry to standard tty line discipline.
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
248 funsetown(tp->t_sigio);
253 ttyflush(tp, FREAD | FWRITE);
254 clist_free_cblocks(&tp->t_canq);
255 clist_free_cblocks(&tp->t_outq);
256 clist_free_cblocks(&tp->t_rawq);
259 tp->t_line = TTYDISC;
267 * Disassociate the tty from its session. Traditionally this has only been
268 * a half-close, meaning that the session was still allowed to point at the
269 * tty (resulting in the tty in the ps command showing something like 'p0-'),
270 * even though the tty is no longer pointing at the session.
272 * The half close seems to be useful only for 'ps' output but there is as
273 * yet no reason to remove the feature. The full-close code is currently
274 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
277 ttyclearsession(struct tty *tp)
282 if ((sp = tp->t_session) != NULL) {
283 tp->t_session = NULL;
284 #ifdef TTY_DO_FULL_CLOSE
285 /* FULL CLOSE (not yet) */
286 if (sp->s_ttyp == tp) {
289 printf("ttyclearsession: warning: sp->s_ttyp != tp "
290 "%p/%p\n", sp->s_ttyp, tp);
297 * Terminate the tty vnode association for a session. This is the
298 * 'other half' of the close.
301 ttyclosesession(struct session *sp, int dorele)
304 struct thread *td = curthread;
306 if ((vp = sp->s_ttyvp) == NULL)
309 if (vp->v_flag & VCTTYISOPEN) {
310 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td) == 0) {
311 vclrflags(vp, VCTTYISOPEN);
312 VOP_CLOSE(vp, 0, td);
313 VOP_UNLOCK(vp, 0, td);
321 #define FLUSHQ(q) { \
323 ndflush(q, (q)->c_cc); \
326 /* Is 'c' a line delimiter ("break" character)? */
327 #define TTBREAKC(c, lflag) \
328 ((c) == '\n' || (((c) == cc[VEOF] || \
329 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
330 (c) != _POSIX_VDISABLE))
333 * Process input of a single character received on a tty.
340 tcflag_t iflag, lflag;
345 * If input is pending take it first.
348 if (ISSET(lflag, PENDIN))
353 if (ISSET(lflag, ICANON))
360 * Block further input iff:
361 * current input > threshold AND input is available to user program
362 * AND input flow control is enabled and not yet invoked.
363 * The 3 is slop for PARMRK.
366 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
367 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
368 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
369 !ISSET(tp->t_state, TS_TBLOCK))
372 /* Handle exceptional conditions (break, parity, framing). */
374 err = (ISSET(c, TTY_ERRORMASK));
376 CLR(c, TTY_ERRORMASK);
377 if (ISSET(err, TTY_BI)) {
378 if (ISSET(iflag, IGNBRK))
380 if (ISSET(iflag, BRKINT)) {
381 ttyflush(tp, FREAD | FWRITE);
382 pgsignal(tp->t_pgrp, SIGINT, 1);
385 if (ISSET(iflag, PARMRK))
387 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
388 || ISSET(err, TTY_FE)) {
389 if (ISSET(iflag, IGNPAR))
391 else if (ISSET(iflag, PARMRK)) {
393 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
396 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
397 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
398 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
405 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
407 if (!ISSET(lflag, EXTPROC)) {
409 * Check for literal nexting very first
411 if (ISSET(tp->t_state, TS_LNCH)) {
413 CLR(tp->t_state, TS_LNCH);
416 * Scan for special characters. This code
417 * is really just a big case statement with
418 * non-constant cases. The bottom of the
419 * case statement is labeled ``endcase'', so goto
420 * it after a case match, or similar.
424 * Control chars which aren't controlled
425 * by ICANON, ISIG, or IXON.
427 if (ISSET(lflag, IEXTEN)) {
428 if (CCEQ(cc[VLNEXT], c)) {
429 if (ISSET(lflag, ECHO)) {
430 if (ISSET(lflag, ECHOE)) {
431 (void)ttyoutput('^', tp);
432 (void)ttyoutput('\b', tp);
436 SET(tp->t_state, TS_LNCH);
439 if (CCEQ(cc[VDISCARD], c)) {
440 if (ISSET(lflag, FLUSHO))
441 CLR(tp->t_lflag, FLUSHO);
443 ttyflush(tp, FWRITE);
445 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
447 SET(tp->t_lflag, FLUSHO);
455 if (ISSET(lflag, ISIG)) {
456 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
457 if (!ISSET(lflag, NOFLSH))
458 ttyflush(tp, FREAD | FWRITE);
461 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
464 if (CCEQ(cc[VSUSP], c)) {
465 if (!ISSET(lflag, NOFLSH))
468 pgsignal(tp->t_pgrp, SIGTSTP, 1);
473 * Handle start/stop characters.
475 if (ISSET(iflag, IXON)) {
476 if (CCEQ(cc[VSTOP], c)) {
477 if (!ISSET(tp->t_state, TS_TTSTOP)) {
478 SET(tp->t_state, TS_TTSTOP);
479 (*tp->t_stop)(tp, 0);
482 if (!CCEQ(cc[VSTART], c))
485 * if VSTART == VSTOP then toggle
489 if (CCEQ(cc[VSTART], c))
493 * IGNCR, ICRNL, & INLCR
496 if (ISSET(iflag, IGNCR))
498 else if (ISSET(iflag, ICRNL))
500 } else if (c == '\n' && ISSET(iflag, INLCR))
503 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
505 * From here on down canonical mode character
506 * processing takes place.
509 * erase or erase2 (^H / ^?)
511 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
513 ttyrub(unputc(&tp->t_rawq), tp);
519 if (CCEQ(cc[VKILL], c)) {
520 if (ISSET(lflag, ECHOKE) &&
521 tp->t_rawq.c_cc == tp->t_rocount &&
522 !ISSET(lflag, ECHOPRT))
523 while (tp->t_rawq.c_cc)
524 ttyrub(unputc(&tp->t_rawq), tp);
527 if (ISSET(lflag, ECHOK) ||
528 ISSET(lflag, ECHOKE))
533 CLR(tp->t_state, TS_LOCAL);
539 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
545 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
550 * erase last char of word and remember the
551 * next chars type (for ALTWERASE)
554 c = unputc(&tp->t_rawq);
557 if (c == ' ' || c == '\t') {
558 (void)putc(c, &tp->t_rawq);
567 c = unputc(&tp->t_rawq);
570 } while (c != ' ' && c != '\t' &&
571 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
572 (void)putc(c, &tp->t_rawq);
578 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
583 * ^T - kernel info and generate SIGINFO
585 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
586 if (ISSET(lflag, ISIG))
587 pgsignal(tp->t_pgrp, SIGINFO, 1);
588 if (!ISSET(lflag, NOKERNINFO))
592 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
593 if (ISSET(lflag, ISIG))
594 pgsignal(tp->t_pgrp, SIGCKPT, 1);
599 * Check for input buffer overflow
601 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
603 if (ISSET(iflag, IMAXBEL)) {
604 if (tp->t_outq.c_cc < tp->t_ohiwat)
605 (void)ttyoutput(CTRL('g'), tp);
610 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
611 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
612 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
615 * Put data char in q for user and
616 * wakeup on seeing a line delimiter.
618 if (putc(c, &tp->t_rawq) >= 0) {
619 if (!ISSET(lflag, ICANON)) {
624 if (TTBREAKC(c, lflag)) {
626 catq(&tp->t_rawq, &tp->t_canq);
628 } else if (tp->t_rocount++ == 0)
629 tp->t_rocol = tp->t_column;
630 if (ISSET(tp->t_state, TS_ERASE)) {
632 * end of prterase \.../
634 CLR(tp->t_state, TS_ERASE);
635 (void)ttyoutput('/', tp);
639 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
641 * Place the cursor over the '^' of the ^D.
643 i = imin(2, tp->t_column - i);
645 (void)ttyoutput('\b', tp);
652 * IXANY means allow any character to restart output.
654 if (ISSET(tp->t_state, TS_TTSTOP) &&
655 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
658 CLR(tp->t_lflag, FLUSHO);
659 CLR(tp->t_state, TS_TTSTOP);
661 return (ttstart(tp));
665 * Output a single character on a tty, doing output processing
666 * as needed (expanding tabs, newline processing, etc.).
667 * Returns < 0 if succeeds, otherwise returns char to resend.
679 if (!ISSET(oflag, OPOST)) {
680 if (ISSET(tp->t_lflag, FLUSHO))
682 if (putc(c, &tp->t_outq))
689 * Do tab expansion if OXTABS is set. Special case if we external
690 * processing, we don't do the tab expansion because we'll probably
691 * get it wrong. If tab expansion needs to be done, let it happen
694 CLR(c, ~TTY_CHARMASK);
696 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
697 c = 8 - (tp->t_column & 7);
698 if (!ISSET(tp->t_lflag, FLUSHO)) {
699 crit_enter(); /* Don't interrupt tabs. */
700 c -= b_to_q(" ", c, &tp->t_outq);
706 return (c ? -1 : '\t');
708 if (c == CEOT && ISSET(oflag, ONOEOT))
712 * Newline translation: if ONLCR is set,
713 * translate newline into "\r\n".
715 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
718 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
721 /* If OCRNL is set, translate "\r" into "\n". */
722 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
724 /* If ONOCR is set, don't transmit CRs when on column 0. */
725 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
730 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
742 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
752 col = (col + 8) & ~7;
760 * Ioctls for all tty devices. Called after line-discipline specific ioctl
761 * has been called to do discipline-specific functions and/or reject any
762 * of these ioctl commands.
766 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
768 struct thread *td = curthread;
769 struct proc *p = td->td_proc;
774 /* If the ioctl involves modification, hang if in the background. */
798 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
808 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
809 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
810 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
811 if (p->p_pgrp->pg_jobc == 0)
813 pgsignal(p->p_pgrp, SIGTTOU, 1);
814 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
822 switch (cmd) { /* Process the ioctl. */
823 case FIOASYNC: /* set/clear async i/o */
826 SET(tp->t_state, TS_ASYNC);
828 CLR(tp->t_state, TS_ASYNC);
831 case FIONBIO: /* set/clear non-blocking i/o */
832 break; /* XXX: delete. */
833 case FIONREAD: /* get # bytes to read */
835 *(int *)data = ttnread(tp);
841 * Policy -- Don't allow FIOSETOWN on someone else's
844 if (tp->t_session != NULL && !isctty(p, tp))
847 error = fsetown(*(int *)data, &tp->t_sigio);
852 if (tp->t_session != NULL && !isctty(p, tp))
854 *(int *)data = fgetown(tp->t_sigio);
857 case TIOCEXCL: /* set exclusive use of tty */
859 SET(tp->t_state, TS_XCLUDE);
862 case TIOCFLUSH: { /* flush buffers */
863 int flags = *(int *)data;
866 flags = FREAD | FWRITE;
868 flags &= FREAD | FWRITE;
872 case TIOCCONS: /* become virtual console */
874 if (constty && constty != tp &&
875 ISSET(constty->t_state, TS_CONNECTED))
878 if ((error = suser(td)) != 0)
882 } else if (tp == constty)
885 case TIOCDRAIN: /* wait till output drained */
890 case TIOCGETA: { /* get termios struct */
891 struct termios *t = (struct termios *)data;
893 bcopy(&tp->t_termios, t, sizeof(struct termios));
896 case TIOCGETD: /* get line discipline */
897 *(int *)data = tp->t_line;
899 case TIOCGWINSZ: /* get window size */
900 *(struct winsize *)data = tp->t_winsize;
902 case TIOCGPGRP: /* get pgrp of tty */
905 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
908 case TIOCHPCL: /* hang up on last close */
910 SET(tp->t_cflag, HUPCL);
914 case TIOCNXCL: /* reset exclusive use of tty */
916 CLR(tp->t_state, TS_XCLUDE);
919 case TIOCOUTQ: /* output queue size */
920 *(int *)data = tp->t_outq.c_cc;
922 case TIOCSETA: /* set termios struct */
923 case TIOCSETAW: /* drain output, set */
924 case TIOCSETAF: { /* drn out, fls in, set */
925 struct termios *t = (struct termios *)data;
927 if (t->c_ispeed == 0)
928 t->c_ispeed = t->c_ospeed;
929 if (t->c_ispeed == 0)
930 t->c_ispeed = tp->t_ospeed;
931 if (t->c_ispeed == 0)
934 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
940 if (cmd == TIOCSETAF)
943 if (!ISSET(t->c_cflag, CIGNORE)) {
945 * Set device hardware.
947 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
951 if (ISSET(t->c_cflag, CLOCAL) &&
952 !ISSET(tp->t_cflag, CLOCAL)) {
954 * XXX disconnections would be too hard to
955 * get rid of without this kludge. The only
956 * way to get rid of controlling terminals
957 * is to exit from the session leader.
959 CLR(tp->t_state, TS_ZOMBIE);
961 wakeup(TSA_CARR_ON(tp));
965 if ((ISSET(tp->t_state, TS_CARR_ON) ||
966 ISSET(t->c_cflag, CLOCAL)) &&
967 !ISSET(tp->t_state, TS_ZOMBIE))
968 SET(tp->t_state, TS_CONNECTED);
970 CLR(tp->t_state, TS_CONNECTED);
971 tp->t_cflag = t->c_cflag;
972 tp->t_ispeed = t->c_ispeed;
973 if (t->c_ospeed != 0)
974 tp->t_ospeed = t->c_ospeed;
977 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
979 if (ISSET(t->c_lflag, ICANON))
980 SET(tp->t_lflag, PENDIN);
983 * XXX we really shouldn't allow toggling
984 * ICANON while we're in a non-termios line
985 * discipline. Now we have to worry about
986 * panicing for a null queue.
988 if (tp->t_canq.c_cbreserved > 0 &&
989 tp->t_rawq.c_cbreserved > 0) {
990 catq(&tp->t_rawq, &tp->t_canq);
992 * XXX the queue limits may be
993 * different, so the old queue
994 * swapping method no longer works.
996 catq(&tp->t_canq, &tp->t_rawq);
998 CLR(tp->t_lflag, PENDIN);
1002 tp->t_iflag = t->c_iflag;
1003 tp->t_oflag = t->c_oflag;
1005 * Make the EXTPROC bit read only.
1007 if (ISSET(tp->t_lflag, EXTPROC))
1008 SET(t->c_lflag, EXTPROC);
1010 CLR(t->c_lflag, EXTPROC);
1011 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1012 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1013 t->c_cc[VTIME] != tp->t_cc[VTIME])
1015 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1019 case TIOCSETD: { /* set line discipline */
1020 int t = *(int *)data;
1021 dev_t device = tp->t_dev;
1023 if ((u_int)t >= nlinesw)
1025 if (t != tp->t_line) {
1027 (*linesw[tp->t_line].l_close)(tp, flag);
1028 error = (*linesw[t].l_open)(device, tp);
1030 (void)(*linesw[tp->t_line].l_open)(device, tp);
1039 case TIOCSTART: /* start output, like ^Q */
1041 if (ISSET(tp->t_state, TS_TTSTOP) ||
1042 ISSET(tp->t_lflag, FLUSHO)) {
1043 CLR(tp->t_lflag, FLUSHO);
1044 CLR(tp->t_state, TS_TTSTOP);
1049 case TIOCSTI: /* simulate terminal input */
1050 if ((flag & FREAD) == 0 && suser(td))
1052 if (!isctty(p, tp) && suser(td))
1055 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1058 case TIOCSTOP: /* stop output, like ^S */
1060 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1061 SET(tp->t_state, TS_TTSTOP);
1062 (*tp->t_stop)(tp, 0);
1066 case TIOCSCTTY: /* become controlling tty */
1067 /* Session ctty vnode pointer set in vnode layer. */
1068 if (!SESS_LEADER(p) ||
1069 ((p->p_session->s_ttyvp || tp->t_session) &&
1070 (tp->t_session != p->p_session)))
1072 tp->t_session = p->p_session;
1073 tp->t_pgrp = p->p_pgrp;
1074 p->p_session->s_ttyp = tp;
1075 p->p_flag |= P_CONTROLT;
1077 case TIOCSPGRP: { /* set pgrp of tty */
1078 struct pgrp *pgrp = pgfind(*(int *)data);
1082 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1087 case TIOCSTAT: /* simulate control-T */
1092 case TIOCSWINSZ: /* set window size */
1093 if (bcmp((caddr_t)&tp->t_winsize, data,
1094 sizeof (struct winsize))) {
1095 tp->t_winsize = *(struct winsize *)data;
1096 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1099 case TIOCSDRAINWAIT:
1103 tp->t_timeout = *(int *)data * hz;
1104 wakeup(TSA_OCOMPLETE(tp));
1105 wakeup(TSA_OLOWAT(tp));
1107 case TIOCGDRAINWAIT:
1108 *(int *)data = tp->t_timeout / hz;
1111 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1112 return (ttcompat(tp, cmd, data, flag));
1121 ttypoll(dev, events, td)
1130 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1131 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1135 if (events & (POLLIN | POLLRDNORM)) {
1136 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1137 revents |= events & (POLLIN | POLLRDNORM);
1139 selrecord(td, &tp->t_rsel);
1141 if (events & (POLLOUT | POLLWRNORM)) {
1142 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1143 ISSET(tp->t_state, TS_CONNECTED))
1144 || ISSET(tp->t_state, TS_ZOMBIE))
1145 revents |= events & (POLLOUT | POLLWRNORM);
1147 selrecord(td, &tp->t_wsel);
1153 static struct filterops ttyread_filtops =
1154 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1155 static struct filterops ttywrite_filtops =
1156 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1159 ttykqfilter(dev, kn)
1163 struct tty *tp = dev->si_tty;
1164 struct klist *klist;
1166 switch (kn->kn_filter) {
1168 klist = &tp->t_rsel.si_note;
1169 kn->kn_fop = &ttyread_filtops;
1172 klist = &tp->t_wsel.si_note;
1173 kn->kn_fop = &ttywrite_filtops;
1179 kn->kn_hook = (caddr_t)dev;
1182 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1189 filt_ttyrdetach(struct knote *kn)
1191 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1194 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1199 filt_ttyread(struct knote *kn, long hint)
1201 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1203 kn->kn_data = ttnread(tp);
1204 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1205 kn->kn_flags |= EV_EOF;
1208 return (kn->kn_data > 0);
1212 filt_ttywdetach(struct knote *kn)
1214 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1217 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1222 filt_ttywrite(kn, hint)
1226 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1228 kn->kn_data = tp->t_outq.c_cc;
1229 if (ISSET(tp->t_state, TS_ZOMBIE))
1231 return (kn->kn_data <= tp->t_olowat &&
1232 ISSET(tp->t_state, TS_CONNECTED));
1236 * Must be called while in a critical section.
1244 if (ISSET(tp->t_lflag, PENDIN))
1246 nread = tp->t_canq.c_cc;
1247 if (!ISSET(tp->t_lflag, ICANON)) {
1248 nread += tp->t_rawq.c_cc;
1249 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1256 * Wait for output to drain.
1266 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1267 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1269 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1270 ISSET(tp->t_state, TS_CONNECTED)) {
1271 SET(tp->t_state, TS_SO_OCOMPLETE);
1272 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1276 if (error == EWOULDBLOCK)
1283 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1290 * Flush if successfully wait.
1298 if ((error = ttywait(tp)) == 0)
1299 ttyflush(tp, FREAD);
1304 * Flush tty read and/or write queues, notifying anyone waiting.
1316 FLUSHQ(&tp->t_outq);
1317 CLR(tp->t_state, TS_TTSTOP);
1319 (*tp->t_stop)(tp, rw);
1321 FLUSHQ(&tp->t_canq);
1322 FLUSHQ(&tp->t_rawq);
1323 CLR(tp->t_lflag, PENDIN);
1326 CLR(tp->t_state, TS_LOCAL);
1328 if (ISSET(tp->t_state, TS_TBLOCK)) {
1330 FLUSHQ(&tp->t_outq);
1334 * Don't let leave any state that might clobber the
1335 * next line discipline (although we should do more
1336 * to send the START char). Not clearing the state
1337 * may have caused the "putc to a clist with no
1338 * reserved cblocks" panic/printf.
1340 CLR(tp->t_state, TS_TBLOCK);
1342 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1343 if (ISSET(tp->t_iflag, IXOFF)) {
1345 * XXX wait a bit in the hope that the stop
1346 * character (if any) will go out. Waiting
1347 * isn't good since it allows races. This
1348 * will be fixed when the stop character is
1349 * put in a special queue. Don't bother with
1350 * the checks in ttywait() since the timeout
1353 SET(tp->t_state, TS_SO_OCOMPLETE);
1354 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1357 * Don't try sending the stop character again.
1359 CLR(tp->t_state, TS_TBLOCK);
1366 FLUSHQ(&tp->t_outq);
1373 * Copy in the default termios characters.
1380 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1391 termioschars(&tp->t_termios);
1395 * Handle input high water. Send stop character for the IXOFF case. Turn
1396 * on our input flow control bit and propagate the changes to the driver.
1397 * XXX the stop character should be put in a special high priority queue.
1404 SET(tp->t_state, TS_TBLOCK);
1405 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1406 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1407 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1412 * Handle input low water. Send start character for the IXOFF case. Turn
1413 * off our input flow control bit and propagate the changes to the driver.
1414 * XXX the start character should be put in a special high priority queue.
1421 CLR(tp->t_state, TS_TBLOCK);
1422 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1423 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1424 SET(tp->t_state, TS_TBLOCK); /* try again later */
1429 /* Not used by any current (i386) drivers. */
1431 * Restart after an inter-char delay.
1439 KASSERT(tp_arg != NULL, ("ttrstrt"));
1443 CLR(tp->t_state, TS_TIMEOUT);
1454 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1460 * "close" a line discipline
1468 if (flag & FNONBLOCK || ttywflush(tp))
1469 ttyflush(tp, FREAD | FWRITE);
1474 * Handle modem control transition on a tty.
1475 * Flag indicates new state of carrier.
1476 * Returns 0 if the line should be turned off, otherwise 1.
1484 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1486 * MDMBUF: do flow control according to carrier flag
1487 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1488 * works if IXON and IXANY are clear.
1491 CLR(tp->t_state, TS_CAR_OFLOW);
1492 CLR(tp->t_state, TS_TTSTOP);
1494 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1495 SET(tp->t_state, TS_CAR_OFLOW);
1496 SET(tp->t_state, TS_TTSTOP);
1497 (*tp->t_stop)(tp, 0);
1499 } else if (flag == 0) {
1503 CLR(tp->t_state, TS_CARR_ON);
1504 if (ISSET(tp->t_state, TS_ISOPEN) &&
1505 !ISSET(tp->t_cflag, CLOCAL)) {
1506 SET(tp->t_state, TS_ZOMBIE);
1507 CLR(tp->t_state, TS_CONNECTED);
1508 if (tp->t_session && tp->t_session->s_leader)
1509 psignal(tp->t_session->s_leader, SIGHUP);
1510 ttyflush(tp, FREAD | FWRITE);
1517 SET(tp->t_state, TS_CARR_ON);
1518 if (!ISSET(tp->t_state, TS_ZOMBIE))
1519 SET(tp->t_state, TS_CONNECTED);
1520 wakeup(TSA_CARR_ON(tp));
1528 * Reinput pending characters after state switch
1529 * call from a critical section.
1538 CLR(tp->t_lflag, PENDIN);
1539 SET(tp->t_state, TS_TYPEN);
1541 * XXX this assumes too much about clist internals. It may even
1542 * fail if the cblock slush pool is empty. We can't allocate more
1543 * cblocks here because we are called from an interrupt handler
1544 * and clist_alloc_cblocks() can wait.
1547 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1548 tp->t_rawq.c_cbmax = tq.c_cbmax;
1549 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1550 while ((c = getc(&tq)) >= 0)
1552 CLR(tp->t_state, TS_TYPEN);
1556 * Process a read call on a tty device.
1559 ttread(tp, uio, flag)
1567 cc_t *cc = tp->t_cc;
1569 int first, error = 0;
1570 int has_stime = 0, last_cc = 0;
1571 long slp = 0; /* XXX this should be renamed `timo'. */
1572 struct timeval stime;
1576 lflag = tp->t_lflag;
1578 * take pending input first
1580 if (ISSET(lflag, PENDIN)) {
1582 splz(); /* reduce latency */
1583 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1587 * Hang process if it's in the background.
1589 if ((pp = curproc) && isbackground(pp, tp)) {
1591 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1592 SIGISMEMBER(pp->p_sigmask, SIGTTIN) ||
1593 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1595 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1596 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1602 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1604 return (0); /* EOF */
1608 * If canonical, use the canonical queue,
1609 * else use the raw queue.
1611 * (should get rid of clists...)
1613 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1615 if (flag & IO_NDELAY) {
1618 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1623 return (EWOULDBLOCK);
1625 if (!ISSET(lflag, ICANON)) {
1628 struct timeval timecopy;
1631 * Check each of the four combinations.
1632 * (m > 0 && t == 0) is the normal read case.
1633 * It should be fairly efficient, so we check that and its
1634 * companion case (m == 0 && t == 0) first.
1635 * For the other two cases, we compute the target sleep time
1644 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1648 t *= 100000; /* time in us */
1649 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1650 ((t1).tv_usec - (t2).tv_usec))
1656 getmicrotime(&timecopy);
1658 /* first character, start timer */
1662 } else if (qp->c_cc > last_cc) {
1663 /* got a character, restart timer */
1667 /* nothing, check expiration */
1668 slp = t - diff(timecopy, stime);
1673 } else { /* m == 0 */
1676 getmicrotime(&timecopy);
1682 slp = t - diff(timecopy, stime);
1684 /* Timed out, but 0 is enough input. */
1692 * Rounding down may make us wake up just short
1693 * of the target, so we round up.
1694 * The formula is ceiling(slp * hz/1000000).
1695 * 32-bit arithmetic is enough for hz < 169.
1696 * XXX see tvtohz() for how to avoid overflow if hz
1697 * is large (divide by `tick' and/or arrange to
1698 * use tvtohz() if hz is large).
1700 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1703 if (qp->c_cc <= 0) {
1706 * There is no input, or not enough input and we can block.
1708 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1709 ISSET(tp->t_state, TS_CONNECTED) ?
1710 "ttyin" : "ttyhup", (int)slp);
1712 if (error == EWOULDBLOCK)
1717 * XXX what happens if another process eats some input
1718 * while we are asleep (not just here)? It would be
1719 * safest to detect changes and reset our state variables
1720 * (has_stime and last_cc).
1728 * Input present, check for input mapping and processing.
1731 if (ISSET(lflag, ICANON | ISIG))
1737 icc = imin(uio->uio_resid, IBUFSIZ);
1738 icc = q_to_b(qp, ibuf, icc);
1744 error = uiomove(ibuf, icc, uio);
1746 * XXX if there was an error then we should ungetc() the
1747 * unmoved chars and reduce icc here.
1751 if (uio->uio_resid == 0)
1765 * delayed suspend (^Y)
1767 if (CCEQ(cc[VDSUSP], c) &&
1768 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1769 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1771 error = ttysleep(tp, &lbolt, PCATCH,
1780 * Interpret EOF only in canonical mode.
1782 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1785 * Give user character.
1787 error = ureadc(c, uio);
1789 /* XXX should ungetc(c, qp). */
1791 if (uio->uio_resid == 0)
1794 * In canonical mode check for a "break character"
1795 * marking the end of a "line of input".
1797 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1804 * Look to unblock input now that (presumably)
1805 * the input queue has gone down.
1808 if (ISSET(tp->t_state, TS_TBLOCK) &&
1809 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1817 * Check the output queue on tp for space for a kernel message (from uprintf
1818 * or tprintf). Allow some space over the normal hiwater mark so we don't
1819 * lose messages due to normal flow control, but don't let the tty run amok.
1820 * Sleeps here are not interruptible, but we return prematurely if new signals
1824 ttycheckoutq(tp, wait)
1831 hiwat = tp->t_ohiwat;
1832 SIGEMPTYSET(oldmask);
1835 oldmask = curproc->p_siglist;
1836 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1837 while (tp->t_outq.c_cc > hiwat) {
1839 if (tp->t_outq.c_cc <= hiwat)
1841 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1845 SET(tp->t_state, TS_SO_OLOWAT);
1846 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1854 * Process a write call on a tty device.
1857 ttwrite(tp, uio, flag)
1865 int i, hiwat, cnt, error;
1868 hiwat = tp->t_ohiwat;
1869 cnt = uio->uio_resid;
1874 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1876 if (uio->uio_resid == cnt)
1880 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1881 if (flag & IO_NDELAY) {
1883 error = EWOULDBLOCK;
1886 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1895 * Hang the process if it's in the background.
1897 if ((pp = curproc) && isbackground(pp, tp) &&
1898 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1899 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1900 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) {
1901 if (pp->p_pgrp->pg_jobc == 0) {
1905 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1906 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1912 * Process the user's data in at most OBUFSIZ chunks. Perform any
1913 * output translation. Keep track of high water mark, sleep on
1914 * overflow awaiting device aid in acquiring new space.
1916 while (uio->uio_resid > 0 || cc > 0) {
1917 if (ISSET(tp->t_lflag, FLUSHO)) {
1921 if (tp->t_outq.c_cc > hiwat)
1924 * Grab a hunk of data from the user, unless we have some
1925 * leftover from last time.
1928 cc = imin(uio->uio_resid, OBUFSIZ);
1930 error = uiomove(cp, cc, uio);
1937 * If nothing fancy need be done, grab those characters we
1938 * can handle without any of ttyoutput's processing and
1939 * just transfer them to the output q. For those chars
1940 * which require special processing (as indicated by the
1941 * bits in char_type), call ttyoutput. After processing
1942 * a hunk of data, look for FLUSHO so ^O's will take effect
1946 if (!ISSET(tp->t_oflag, OPOST))
1949 ce = cc - scanc((u_int)cc, (u_char *)cp,
1950 char_type, CCLASSMASK);
1952 * If ce is zero, then we're processing
1953 * a special character through ttyoutput.
1957 if (ttyoutput(*cp, tp) >= 0) {
1958 /* No Clists, wait a bit. */
1960 if (flag & IO_NDELAY) {
1961 error = EWOULDBLOCK;
1964 error = ttysleep(tp, &lbolt,
1973 if (ISSET(tp->t_lflag, FLUSHO) ||
1974 tp->t_outq.c_cc > hiwat)
1980 * A bunch of normal characters have been found.
1981 * Transfer them en masse to the output queue and
1982 * continue processing at the top of the loop.
1983 * If there are any further characters in this
1984 * <= OBUFSIZ chunk, the first should be a character
1985 * requiring special handling by ttyoutput.
1988 i = b_to_q(cp, ce, &tp->t_outq);
1991 cp += ce, cc -= ce, tk_nout += ce;
1994 /* No Clists, wait a bit. */
1996 if (flag & IO_NDELAY) {
1997 error = EWOULDBLOCK;
2000 error = ttysleep(tp, &lbolt, PCATCH,
2006 if (ISSET(tp->t_lflag, FLUSHO) ||
2007 tp->t_outq.c_cc > hiwat)
2014 * If cc is nonzero, we leave the uio structure inconsistent, as the
2015 * offset and iov pointers have moved forward, but it doesn't matter
2016 * (the call will either return short or restart with a new uio).
2018 uio->uio_resid += cc;
2025 * This can only occur if FLUSHO is set in t_lflag,
2026 * or if ttstart/oproc is synchronous (or very fast).
2028 if (tp->t_outq.c_cc <= hiwat) {
2032 if (flag & IO_NDELAY) {
2034 uio->uio_resid += cc;
2035 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2037 SET(tp->t_state, TS_SO_OLOWAT);
2038 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2040 if (error == EWOULDBLOCK)
2048 * Rubout one character from the rawq of tp
2049 * as cleanly as possible.
2060 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2062 CLR(tp->t_lflag, FLUSHO);
2063 if (ISSET(tp->t_lflag, ECHOE)) {
2064 if (tp->t_rocount == 0) {
2066 * Screwed by ttwrite; retype
2071 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2074 CLR(c, ~TTY_CHARMASK);
2075 switch (CCLASS(c)) {
2084 if (ISSET(tp->t_lflag, ECHOCTL))
2088 if (tp->t_rocount < tp->t_rawq.c_cc) {
2093 savecol = tp->t_column;
2094 SET(tp->t_state, TS_CNTTB);
2095 SET(tp->t_lflag, FLUSHO);
2096 tp->t_column = tp->t_rocol;
2097 cp = tp->t_rawq.c_cf;
2099 tabc = *cp; /* XXX FIX NEXTC */
2100 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2102 CLR(tp->t_lflag, FLUSHO);
2103 CLR(tp->t_state, TS_CNTTB);
2106 /* savecol will now be length of the tab. */
2107 savecol -= tp->t_column;
2108 tp->t_column += savecol;
2110 savecol = 8; /* overflow screw */
2111 while (--savecol >= 0)
2112 (void)ttyoutput('\b', tp);
2115 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2116 (void)printf(PANICSTR, c, CCLASS(c));
2118 panic(PANICSTR, c, CCLASS(c));
2122 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2123 if (!ISSET(tp->t_state, TS_ERASE)) {
2124 SET(tp->t_state, TS_ERASE);
2125 (void)ttyoutput('\\', tp);
2129 ttyecho(tp->t_cc[VERASE], tp);
2131 * This code may be executed not only when an ERASE key
2132 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2133 * So, I didn't think it was worthwhile to pass the extra
2134 * information (which would need an extra parameter,
2135 * changing every call) needed to distinguish the ERASE2
2136 * case from the ERASE.
2143 * Back over cnt characters, erasing them.
2152 (void)ttyoutput('\b', tp);
2153 (void)ttyoutput(' ', tp);
2154 (void)ttyoutput('\b', tp);
2160 * Reprint the rawq line. Note, it is assumed that c_cc has already
2170 /* Echo the reprint character. */
2171 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2172 ttyecho(tp->t_cc[VREPRINT], tp);
2174 (void)ttyoutput('\n', tp);
2178 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2179 * BIT OF FIRST CHAR.
2182 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2183 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2185 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2186 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2188 CLR(tp->t_state, TS_ERASE);
2191 tp->t_rocount = tp->t_rawq.c_cc;
2196 * Echo a typed character to the terminal.
2204 if (!ISSET(tp->t_state, TS_CNTTB))
2205 CLR(tp->t_lflag, FLUSHO);
2206 if ((!ISSET(tp->t_lflag, ECHO) &&
2207 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2208 ISSET(tp->t_lflag, EXTPROC))
2210 if (ISSET(tp->t_lflag, ECHOCTL) &&
2211 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2212 ISSET(c, TTY_CHARMASK) == 0177)) {
2213 (void)ttyoutput('^', tp);
2214 CLR(c, ~TTY_CHARMASK);
2220 (void)ttyoutput(c, tp);
2224 * Wake up any readers on a tty.
2231 if (tp->t_rsel.si_pid != 0)
2232 selwakeup(&tp->t_rsel);
2233 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2234 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2235 wakeup(TSA_HUP_OR_INPUT(tp));
2236 KNOTE(&tp->t_rsel.si_note, 0);
2240 * Wake up any writers on a tty.
2247 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2248 selwakeup(&tp->t_wsel);
2249 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2250 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2251 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2252 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2253 CLR(tp->t_state, TS_SO_OCOMPLETE);
2254 wakeup(TSA_OCOMPLETE(tp));
2256 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2257 tp->t_outq.c_cc <= tp->t_olowat) {
2258 CLR(tp->t_state, TS_SO_OLOWAT);
2259 wakeup(TSA_OLOWAT(tp));
2261 KNOTE(&tp->t_wsel.si_note, 0);
2265 * Look up a code for a specified speed in a conversion table;
2266 * used by drivers to map software speed values to hardware parameters.
2269 ttspeedtab(speed, table)
2271 struct speedtab *table;
2274 for ( ; table->sp_speed != -1; table++)
2275 if (table->sp_speed == speed)
2276 return (table->sp_code);
2281 * Set input and output watermarks and buffer sizes. For input, the
2282 * high watermark is about one second's worth of input above empty, the
2283 * low watermark is slightly below high water, and the buffer size is a
2284 * driver-dependent amount above high water. For output, the watermarks
2285 * are near the ends of the buffer, with about 1 second's worth of input
2286 * between them. All this only applies to the standard line discipline.
2292 int cps, ttmaxhiwat, x;
2295 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2296 switch (tp->t_ispeedwat) {
2298 cps = tp->t_ispeed / 10;
2302 * This case is for old drivers that don't know about
2303 * t_ispeedwat. Arrange for them to get the old buffer
2304 * sizes and watermarks.
2306 cps = TTYHOG - 2 * 256;
2307 tp->t_ififosize = 2 * 256;
2310 cps = tp->t_ispeedwat / 10;
2314 tp->t_ilowat = 7 * cps / 8;
2315 x = cps + tp->t_ififosize;
2316 clist_alloc_cblocks(&tp->t_rawq, x, x);
2319 switch (tp->t_ospeedwat) {
2321 cps = tp->t_ospeed / 10;
2322 ttmaxhiwat = 2 * TTMAXHIWAT;
2325 cps = tp->t_ospeed / 10;
2326 ttmaxhiwat = TTMAXHIWAT;
2329 cps = tp->t_ospeedwat / 10;
2330 ttmaxhiwat = 8 * TTMAXHIWAT;
2333 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2334 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2336 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2337 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2338 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2340 clist_alloc_cblocks(&tp->t_outq, x, x);
2345 * Report on state of foreground process group.
2351 struct proc *p, *pick;
2352 struct timeval utime, stime;
2355 if (ttycheckoutq(tp,0) == 0)
2359 * We always print the load average, then figure out what else to
2360 * print based on the state of the current process group.
2362 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2363 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2365 if (tp->t_session == NULL) {
2366 ttyprintf(tp, "not a controlling terminal\n");
2367 } else if (tp->t_pgrp == NULL) {
2368 ttyprintf(tp, "no foreground process group\n");
2369 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2370 ttyprintf(tp, "empty foreground process group\n");
2373 * Pick an interesting process. Note that certain elements,
2374 * in particular the wmesg, require a critical section for
2375 * safe access (YYY and we are still not MP safe).
2377 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2378 * p_thread->td_comm.
2388 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2389 if (proc_compare(pick, p))
2394 * Figure out what wait/process-state message, and command
2397 if (pick->p_thread == NULL)
2399 else if (pick->p_stat == SRUN)
2401 else if (pick->p_wmesg) /* p_thread must not be NULL */
2402 str = pick->p_wmesg;
2406 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2407 (pick->p_thread ? pick->p_comm : "?"),
2411 * Calculate cpu usage, percent cpu, and cmsz. Note that
2412 * 'pick' becomes invalid the moment we exit the critical
2415 if (pick->p_thread && (pick->p_flag & P_INMEM)) {
2416 calcru(pick, &utime, &stime, NULL);
2422 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2424 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2427 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2434 ttyprintf(tp, " %s ", buf);
2436 ttyprintf(tp, "%ld.%02ldu ",
2437 utime.tv_sec, utime.tv_usec / 10000);
2438 ttyprintf(tp, "%ld.%02lds ",
2439 stime.tv_sec, stime.tv_usec / 10000);
2441 ttyprintf(tp, "?.??u ?.??s ");
2443 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2445 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2449 * Returns 1 if p2 is "better" than p1
2451 * The algorithm for picking the "interesting" process is thus:
2453 * 1) Only foreground processes are eligible - implied.
2454 * 2) Runnable processes are favored over anything else. The runner
2455 * with the highest cpu utilization is picked (p_cpticks). Ties are
2456 * broken by picking the highest pid.
2457 * 3) The sleeper with the shortest sleep time is next. With ties,
2458 * we pick out just "short-term" sleepers (P_SINTR == 0).
2459 * 4) Further ties are broken by picking the highest pid.
2461 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2462 #define TESTAB(a, b) ((a)<<1 | (b))
2468 proc_compare(p1, p2)
2469 struct proc *p1, *p2;
2475 * see if at least one of them is runnable
2477 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2484 * tie - favor one with highest recent cpu utilization
2486 if (p2->p_cpticks > p1->p_cpticks)
2488 if (p1->p_cpticks > p2->p_cpticks)
2490 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2495 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2501 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2504 * pick the one with the smallest sleep time
2506 if (p2->p_slptime > p1->p_slptime)
2508 if (p1->p_slptime > p2->p_slptime)
2511 * favor one sleeping in a non-interruptible sleep
2513 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2515 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2517 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2521 * Output char to tty; console putchar style.
2529 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2534 (void)ttyoutput('\r', tp);
2535 (void)ttyoutput(c, tp);
2542 * Sleep on chan, returning ERESTART if tty changed while we napped and
2543 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2544 * the tty is revoked, restarting a pending call will redo validation done
2545 * at the start of the call.
2548 ttysleep(tp, chan, slpflags, wmesg, timo)
2558 error = tsleep(chan, slpflags, wmesg, timo);
2561 return (tp->t_gen == gen ? 0 : ERESTART);
2565 * Allocate a tty struct. Clists in the struct will be allocated by
2575 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2582 * Free a tty struct. Clists in the struct should have been freed by
2585 * XXX not yet usable: since we support a half-closed state and do not
2586 * ref count the tty reference from the session, it is possible for a
2587 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2601 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2605 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2609 SLIST_FOREACH(tp, &tty_list, t_list) {
2612 t.t_dev = (dev_t)dev2udev(t.t_dev);
2613 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2620 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2621 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2633 ttyread(dev, uio, flag)
2643 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2647 ttywrite(dev, uio, flag)
2657 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));