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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22 * 4. Neither the name of the University nor the names of its contributors
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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 1.16 2004/12/29 02:40:52 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.
226 if (!ISSET(tp->t_state, TS_ISOPEN)) {
227 SET(tp->t_state, TS_ISOPEN);
228 if (ISSET(tp->t_cflag, CLOCAL))
229 SET(tp->t_state, TS_CONNECTED);
230 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
238 * Handle close() on a tty line: flush and set to initial state,
239 * bumping generation number so that pending read/write calls
240 * can detect recycling of the tty.
242 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
243 * and l_close() should have flushed, but we repeat the spltty() and
244 * the flush in case there are buggy callers.
252 funsetown(tp->t_sigio);
257 ttyflush(tp, FREAD | FWRITE);
258 clist_free_cblocks(&tp->t_canq);
259 clist_free_cblocks(&tp->t_outq);
260 clist_free_cblocks(&tp->t_rawq);
263 tp->t_line = TTYDISC;
271 * Disassociate the tty from its session. Traditionally this has only been
272 * a half-close, meaning that the session was still allowed to point at the
273 * tty (resulting in the tty in the ps command showing something like 'p0-'),
274 * even though the tty is no longer pointing at the session.
276 * The half close seems to be useful only for 'ps' output but there is as
277 * yet no reason to remove the feature. The full-close code is currently
278 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
281 ttyclearsession(struct tty *tp)
286 if ((sp = tp->t_session) != NULL) {
287 tp->t_session = NULL;
288 #ifdef TTY_DO_FULL_CLOSE
289 /* FULL CLOSE (not yet) */
290 if (sp->s_ttyp == tp) {
293 printf("ttyclearsession: warning: sp->s_ttyp != tp "
294 "%p/%p\n", sp->s_ttyp, tp);
301 * Terminate the tty vnode association for a session. This is the
302 * 'other half' of the close.
305 ttyclosesession(struct session *sp, int dorele)
308 struct thread *td = curthread;
310 if ((vp = sp->s_ttyvp) == NULL)
313 if (vp->v_flag & VCTTYISOPEN) {
314 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td) == 0) {
315 vclrflags(vp, VCTTYISOPEN);
316 VOP_CLOSE(vp, 0, td);
317 VOP_UNLOCK(vp, 0, td);
325 #define FLUSHQ(q) { \
327 ndflush(q, (q)->c_cc); \
330 /* Is 'c' a line delimiter ("break" character)? */
331 #define TTBREAKC(c, lflag) \
332 ((c) == '\n' || (((c) == cc[VEOF] || \
333 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
334 (c) != _POSIX_VDISABLE))
337 * Process input of a single character received on a tty.
344 tcflag_t iflag, lflag;
349 * If input is pending take it first.
352 if (ISSET(lflag, PENDIN))
357 if (ISSET(lflag, ICANON))
364 * Block further input iff:
365 * current input > threshold AND input is available to user program
366 * AND input flow control is enabled and not yet invoked.
367 * The 3 is slop for PARMRK.
370 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
371 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
372 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
373 !ISSET(tp->t_state, TS_TBLOCK))
376 /* Handle exceptional conditions (break, parity, framing). */
378 err = (ISSET(c, TTY_ERRORMASK));
380 CLR(c, TTY_ERRORMASK);
381 if (ISSET(err, TTY_BI)) {
382 if (ISSET(iflag, IGNBRK))
384 if (ISSET(iflag, BRKINT)) {
385 ttyflush(tp, FREAD | FWRITE);
386 pgsignal(tp->t_pgrp, SIGINT, 1);
389 if (ISSET(iflag, PARMRK))
391 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
392 || ISSET(err, TTY_FE)) {
393 if (ISSET(iflag, IGNPAR))
395 else if (ISSET(iflag, PARMRK)) {
397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
400 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
401 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
402 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
409 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
411 if (!ISSET(lflag, EXTPROC)) {
413 * Check for literal nexting very first
415 if (ISSET(tp->t_state, TS_LNCH)) {
417 CLR(tp->t_state, TS_LNCH);
420 * Scan for special characters. This code
421 * is really just a big case statement with
422 * non-constant cases. The bottom of the
423 * case statement is labeled ``endcase'', so goto
424 * it after a case match, or similar.
428 * Control chars which aren't controlled
429 * by ICANON, ISIG, or IXON.
431 if (ISSET(lflag, IEXTEN)) {
432 if (CCEQ(cc[VLNEXT], c)) {
433 if (ISSET(lflag, ECHO)) {
434 if (ISSET(lflag, ECHOE)) {
435 (void)ttyoutput('^', tp);
436 (void)ttyoutput('\b', tp);
440 SET(tp->t_state, TS_LNCH);
443 if (CCEQ(cc[VDISCARD], c)) {
444 if (ISSET(lflag, FLUSHO))
445 CLR(tp->t_lflag, FLUSHO);
447 ttyflush(tp, FWRITE);
449 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
451 SET(tp->t_lflag, FLUSHO);
459 if (ISSET(lflag, ISIG)) {
460 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
461 if (!ISSET(lflag, NOFLSH))
462 ttyflush(tp, FREAD | FWRITE);
465 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
468 if (CCEQ(cc[VSUSP], c)) {
469 if (!ISSET(lflag, NOFLSH))
472 pgsignal(tp->t_pgrp, SIGTSTP, 1);
477 * Handle start/stop characters.
479 if (ISSET(iflag, IXON)) {
480 if (CCEQ(cc[VSTOP], c)) {
481 if (!ISSET(tp->t_state, TS_TTSTOP)) {
482 SET(tp->t_state, TS_TTSTOP);
483 (*tp->t_stop)(tp, 0);
486 if (!CCEQ(cc[VSTART], c))
489 * if VSTART == VSTOP then toggle
493 if (CCEQ(cc[VSTART], c))
497 * IGNCR, ICRNL, & INLCR
500 if (ISSET(iflag, IGNCR))
502 else if (ISSET(iflag, ICRNL))
504 } else if (c == '\n' && ISSET(iflag, INLCR))
507 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
509 * From here on down canonical mode character
510 * processing takes place.
513 * erase or erase2 (^H / ^?)
515 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
517 ttyrub(unputc(&tp->t_rawq), tp);
523 if (CCEQ(cc[VKILL], c)) {
524 if (ISSET(lflag, ECHOKE) &&
525 tp->t_rawq.c_cc == tp->t_rocount &&
526 !ISSET(lflag, ECHOPRT))
527 while (tp->t_rawq.c_cc)
528 ttyrub(unputc(&tp->t_rawq), tp);
531 if (ISSET(lflag, ECHOK) ||
532 ISSET(lflag, ECHOKE))
537 CLR(tp->t_state, TS_LOCAL);
543 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
549 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
554 * erase last char of word and remember the
555 * next chars type (for ALTWERASE)
558 c = unputc(&tp->t_rawq);
561 if (c == ' ' || c == '\t') {
562 (void)putc(c, &tp->t_rawq);
571 c = unputc(&tp->t_rawq);
574 } while (c != ' ' && c != '\t' &&
575 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
576 (void)putc(c, &tp->t_rawq);
582 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
587 * ^T - kernel info and generate SIGINFO
589 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
590 if (ISSET(lflag, ISIG))
591 pgsignal(tp->t_pgrp, SIGINFO, 1);
592 if (!ISSET(lflag, NOKERNINFO))
596 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
597 if (ISSET(lflag, ISIG))
598 pgsignal(tp->t_pgrp, SIGCKPT, 1);
603 * Check for input buffer overflow
605 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
607 if (ISSET(iflag, IMAXBEL)) {
608 if (tp->t_outq.c_cc < tp->t_ohiwat)
609 (void)ttyoutput(CTRL('g'), tp);
614 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
615 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
616 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
619 * Put data char in q for user and
620 * wakeup on seeing a line delimiter.
622 if (putc(c, &tp->t_rawq) >= 0) {
623 if (!ISSET(lflag, ICANON)) {
628 if (TTBREAKC(c, lflag)) {
630 catq(&tp->t_rawq, &tp->t_canq);
632 } else if (tp->t_rocount++ == 0)
633 tp->t_rocol = tp->t_column;
634 if (ISSET(tp->t_state, TS_ERASE)) {
636 * end of prterase \.../
638 CLR(tp->t_state, TS_ERASE);
639 (void)ttyoutput('/', tp);
643 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
645 * Place the cursor over the '^' of the ^D.
647 i = imin(2, tp->t_column - i);
649 (void)ttyoutput('\b', tp);
656 * IXANY means allow any character to restart output.
658 if (ISSET(tp->t_state, TS_TTSTOP) &&
659 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
662 CLR(tp->t_lflag, FLUSHO);
663 CLR(tp->t_state, TS_TTSTOP);
665 return (ttstart(tp));
669 * Output a single character on a tty, doing output processing
670 * as needed (expanding tabs, newline processing, etc.).
671 * Returns < 0 if succeeds, otherwise returns char to resend.
683 if (!ISSET(oflag, OPOST)) {
684 if (ISSET(tp->t_lflag, FLUSHO))
686 if (putc(c, &tp->t_outq))
693 * Do tab expansion if OXTABS is set. Special case if we external
694 * processing, we don't do the tab expansion because we'll probably
695 * get it wrong. If tab expansion needs to be done, let it happen
698 CLR(c, ~TTY_CHARMASK);
700 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
701 c = 8 - (tp->t_column & 7);
702 if (!ISSET(tp->t_lflag, FLUSHO)) {
703 s = spltty(); /* Don't interrupt tabs. */
704 c -= b_to_q(" ", c, &tp->t_outq);
710 return (c ? -1 : '\t');
712 if (c == CEOT && ISSET(oflag, ONOEOT))
716 * Newline translation: if ONLCR is set,
717 * translate newline into "\r\n".
719 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
722 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
725 /* If OCRNL is set, translate "\r" into "\n". */
726 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
728 /* If ONOCR is set, don't transmit CRs when on column 0. */
729 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
734 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
746 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
756 col = (col + 8) & ~7;
764 * Ioctls for all tty devices. Called after line-discipline specific ioctl
765 * has been called to do discipline-specific functions and/or reject any
766 * of these ioctl commands.
770 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
772 struct thread *td = curthread;
773 struct proc *p = td->td_proc;
778 /* If the ioctl involves modification, hang if in the background. */
802 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
812 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
813 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
814 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
815 if (p->p_pgrp->pg_jobc == 0)
817 pgsignal(p->p_pgrp, SIGTTOU, 1);
818 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
826 switch (cmd) { /* Process the ioctl. */
827 case FIOASYNC: /* set/clear async i/o */
830 SET(tp->t_state, TS_ASYNC);
832 CLR(tp->t_state, TS_ASYNC);
835 case FIONBIO: /* set/clear non-blocking i/o */
836 break; /* XXX: delete. */
837 case FIONREAD: /* get # bytes to read */
839 *(int *)data = ttnread(tp);
845 * Policy -- Don't allow FIOSETOWN on someone else's
848 if (tp->t_session != NULL && !isctty(p, tp))
851 error = fsetown(*(int *)data, &tp->t_sigio);
856 if (tp->t_session != NULL && !isctty(p, tp))
858 *(int *)data = fgetown(tp->t_sigio);
861 case TIOCEXCL: /* set exclusive use of tty */
863 SET(tp->t_state, TS_XCLUDE);
866 case TIOCFLUSH: { /* flush buffers */
867 int flags = *(int *)data;
870 flags = FREAD | FWRITE;
872 flags &= FREAD | FWRITE;
876 case TIOCCONS: /* become virtual console */
878 if (constty && constty != tp &&
879 ISSET(constty->t_state, TS_CONNECTED))
882 if ((error = suser(td)) != 0)
886 } else if (tp == constty)
889 case TIOCDRAIN: /* wait till output drained */
894 case TIOCGETA: { /* get termios struct */
895 struct termios *t = (struct termios *)data;
897 bcopy(&tp->t_termios, t, sizeof(struct termios));
900 case TIOCGETD: /* get line discipline */
901 *(int *)data = tp->t_line;
903 case TIOCGWINSZ: /* get window size */
904 *(struct winsize *)data = tp->t_winsize;
906 case TIOCGPGRP: /* get pgrp of tty */
909 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
912 case TIOCHPCL: /* hang up on last close */
914 SET(tp->t_cflag, HUPCL);
918 case TIOCNXCL: /* reset exclusive use of tty */
920 CLR(tp->t_state, TS_XCLUDE);
923 case TIOCOUTQ: /* output queue size */
924 *(int *)data = tp->t_outq.c_cc;
926 case TIOCSETA: /* set termios struct */
927 case TIOCSETAW: /* drain output, set */
928 case TIOCSETAF: { /* drn out, fls in, set */
929 struct termios *t = (struct termios *)data;
931 if (t->c_ispeed == 0)
932 t->c_ispeed = t->c_ospeed;
933 if (t->c_ispeed == 0)
934 t->c_ispeed = tp->t_ospeed;
935 if (t->c_ispeed == 0)
938 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
944 if (cmd == TIOCSETAF)
947 if (!ISSET(t->c_cflag, CIGNORE)) {
949 * Set device hardware.
951 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
955 if (ISSET(t->c_cflag, CLOCAL) &&
956 !ISSET(tp->t_cflag, CLOCAL)) {
958 * XXX disconnections would be too hard to
959 * get rid of without this kludge. The only
960 * way to get rid of controlling terminals
961 * is to exit from the session leader.
963 CLR(tp->t_state, TS_ZOMBIE);
965 wakeup(TSA_CARR_ON(tp));
969 if ((ISSET(tp->t_state, TS_CARR_ON) ||
970 ISSET(t->c_cflag, CLOCAL)) &&
971 !ISSET(tp->t_state, TS_ZOMBIE))
972 SET(tp->t_state, TS_CONNECTED);
974 CLR(tp->t_state, TS_CONNECTED);
975 tp->t_cflag = t->c_cflag;
976 tp->t_ispeed = t->c_ispeed;
977 if (t->c_ospeed != 0)
978 tp->t_ospeed = t->c_ospeed;
981 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
983 if (ISSET(t->c_lflag, ICANON))
984 SET(tp->t_lflag, PENDIN);
987 * XXX we really shouldn't allow toggling
988 * ICANON while we're in a non-termios line
989 * discipline. Now we have to worry about
990 * panicing for a null queue.
992 if (tp->t_canq.c_cbreserved > 0 &&
993 tp->t_rawq.c_cbreserved > 0) {
994 catq(&tp->t_rawq, &tp->t_canq);
996 * XXX the queue limits may be
997 * different, so the old queue
998 * swapping method no longer works.
1000 catq(&tp->t_canq, &tp->t_rawq);
1002 CLR(tp->t_lflag, PENDIN);
1006 tp->t_iflag = t->c_iflag;
1007 tp->t_oflag = t->c_oflag;
1009 * Make the EXTPROC bit read only.
1011 if (ISSET(tp->t_lflag, EXTPROC))
1012 SET(t->c_lflag, EXTPROC);
1014 CLR(t->c_lflag, EXTPROC);
1015 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1016 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1017 t->c_cc[VTIME] != tp->t_cc[VTIME])
1019 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1023 case TIOCSETD: { /* set line discipline */
1024 int t = *(int *)data;
1025 dev_t device = tp->t_dev;
1027 if ((u_int)t >= nlinesw)
1029 if (t != tp->t_line) {
1031 (*linesw[tp->t_line].l_close)(tp, flag);
1032 error = (*linesw[t].l_open)(device, tp);
1034 (void)(*linesw[tp->t_line].l_open)(device, tp);
1043 case TIOCSTART: /* start output, like ^Q */
1045 if (ISSET(tp->t_state, TS_TTSTOP) ||
1046 ISSET(tp->t_lflag, FLUSHO)) {
1047 CLR(tp->t_lflag, FLUSHO);
1048 CLR(tp->t_state, TS_TTSTOP);
1053 case TIOCSTI: /* simulate terminal input */
1054 if ((flag & FREAD) == 0 && suser(td))
1056 if (!isctty(p, tp) && suser(td))
1059 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1062 case TIOCSTOP: /* stop output, like ^S */
1064 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1065 SET(tp->t_state, TS_TTSTOP);
1066 (*tp->t_stop)(tp, 0);
1070 case TIOCSCTTY: /* become controlling tty */
1071 /* Session ctty vnode pointer set in vnode layer. */
1072 if (!SESS_LEADER(p) ||
1073 ((p->p_session->s_ttyvp || tp->t_session) &&
1074 (tp->t_session != p->p_session)))
1076 tp->t_session = p->p_session;
1077 tp->t_pgrp = p->p_pgrp;
1078 p->p_session->s_ttyp = tp;
1079 p->p_flag |= P_CONTROLT;
1081 case TIOCSPGRP: { /* set pgrp of tty */
1082 struct pgrp *pgrp = pgfind(*(int *)data);
1086 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1091 case TIOCSTAT: /* simulate control-T */
1096 case TIOCSWINSZ: /* set window size */
1097 if (bcmp((caddr_t)&tp->t_winsize, data,
1098 sizeof (struct winsize))) {
1099 tp->t_winsize = *(struct winsize *)data;
1100 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1103 case TIOCSDRAINWAIT:
1107 tp->t_timeout = *(int *)data * hz;
1108 wakeup(TSA_OCOMPLETE(tp));
1109 wakeup(TSA_OLOWAT(tp));
1111 case TIOCGDRAINWAIT:
1112 *(int *)data = tp->t_timeout / hz;
1115 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1116 return (ttcompat(tp, cmd, data, flag));
1125 ttypoll(dev, events, td)
1135 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1136 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1140 if (events & (POLLIN | POLLRDNORM)) {
1141 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1142 revents |= events & (POLLIN | POLLRDNORM);
1144 selrecord(td, &tp->t_rsel);
1146 if (events & (POLLOUT | POLLWRNORM)) {
1147 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1148 ISSET(tp->t_state, TS_CONNECTED))
1149 || ISSET(tp->t_state, TS_ZOMBIE))
1150 revents |= events & (POLLOUT | POLLWRNORM);
1152 selrecord(td, &tp->t_wsel);
1158 static struct filterops ttyread_filtops =
1159 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1160 static struct filterops ttywrite_filtops =
1161 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1164 ttykqfilter(dev, kn)
1168 struct tty *tp = dev->si_tty;
1169 struct klist *klist;
1172 switch (kn->kn_filter) {
1174 klist = &tp->t_rsel.si_note;
1175 kn->kn_fop = &ttyread_filtops;
1178 klist = &tp->t_wsel.si_note;
1179 kn->kn_fop = &ttywrite_filtops;
1185 kn->kn_hook = (caddr_t)dev;
1188 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1195 filt_ttyrdetach(struct knote *kn)
1197 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1200 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1205 filt_ttyread(struct knote *kn, long hint)
1207 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1209 kn->kn_data = ttnread(tp);
1210 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1211 kn->kn_flags |= EV_EOF;
1214 return (kn->kn_data > 0);
1218 filt_ttywdetach(struct knote *kn)
1220 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1223 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1228 filt_ttywrite(kn, hint)
1232 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1234 kn->kn_data = tp->t_outq.c_cc;
1235 if (ISSET(tp->t_state, TS_ZOMBIE))
1237 return (kn->kn_data <= tp->t_olowat &&
1238 ISSET(tp->t_state, TS_CONNECTED));
1242 * Must be called at spltty().
1250 if (ISSET(tp->t_lflag, PENDIN))
1252 nread = tp->t_canq.c_cc;
1253 if (!ISSET(tp->t_lflag, ICANON)) {
1254 nread += tp->t_rawq.c_cc;
1255 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1262 * Wait for output to drain.
1272 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1273 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1275 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1276 ISSET(tp->t_state, TS_CONNECTED)) {
1277 SET(tp->t_state, TS_SO_OCOMPLETE);
1278 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1282 if (error == EWOULDBLOCK)
1289 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1296 * Flush if successfully wait.
1304 if ((error = ttywait(tp)) == 0)
1305 ttyflush(tp, FREAD);
1310 * Flush tty read and/or write queues, notifying anyone waiting.
1324 FLUSHQ(&tp->t_outq);
1325 CLR(tp->t_state, TS_TTSTOP);
1327 (*tp->t_stop)(tp, rw);
1329 FLUSHQ(&tp->t_canq);
1330 FLUSHQ(&tp->t_rawq);
1331 CLR(tp->t_lflag, PENDIN);
1334 CLR(tp->t_state, TS_LOCAL);
1336 if (ISSET(tp->t_state, TS_TBLOCK)) {
1338 FLUSHQ(&tp->t_outq);
1342 * Don't let leave any state that might clobber the
1343 * next line discipline (although we should do more
1344 * to send the START char). Not clearing the state
1345 * may have caused the "putc to a clist with no
1346 * reserved cblocks" panic/printf.
1348 CLR(tp->t_state, TS_TBLOCK);
1350 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1351 if (ISSET(tp->t_iflag, IXOFF)) {
1353 * XXX wait a bit in the hope that the stop
1354 * character (if any) will go out. Waiting
1355 * isn't good since it allows races. This
1356 * will be fixed when the stop character is
1357 * put in a special queue. Don't bother with
1358 * the checks in ttywait() since the timeout
1361 SET(tp->t_state, TS_SO_OCOMPLETE);
1362 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1365 * Don't try sending the stop character again.
1367 CLR(tp->t_state, TS_TBLOCK);
1374 FLUSHQ(&tp->t_outq);
1381 * Copy in the default termios characters.
1388 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1399 termioschars(&tp->t_termios);
1403 * Handle input high water. Send stop character for the IXOFF case. Turn
1404 * on our input flow control bit and propagate the changes to the driver.
1405 * XXX the stop character should be put in a special high priority queue.
1412 SET(tp->t_state, TS_TBLOCK);
1413 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1414 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1415 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1420 * Handle input low water. Send start character for the IXOFF case. Turn
1421 * off our input flow control bit and propagate the changes to the driver.
1422 * XXX the start character should be put in a special high priority queue.
1429 CLR(tp->t_state, TS_TBLOCK);
1430 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1431 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1432 SET(tp->t_state, TS_TBLOCK); /* try again later */
1437 /* Not used by any current (i386) drivers. */
1439 * Restart after an inter-char delay.
1448 KASSERT(tp_arg != NULL, ("ttrstrt"));
1453 CLR(tp->t_state, TS_TIMEOUT);
1465 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1471 * "close" a line discipline
1479 if (flag & FNONBLOCK || ttywflush(tp))
1480 ttyflush(tp, FREAD | FWRITE);
1485 * Handle modem control transition on a tty.
1486 * Flag indicates new state of carrier.
1487 * Returns 0 if the line should be turned off, otherwise 1.
1495 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1497 * MDMBUF: do flow control according to carrier flag
1498 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1499 * works if IXON and IXANY are clear.
1502 CLR(tp->t_state, TS_CAR_OFLOW);
1503 CLR(tp->t_state, TS_TTSTOP);
1505 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1506 SET(tp->t_state, TS_CAR_OFLOW);
1507 SET(tp->t_state, TS_TTSTOP);
1508 (*tp->t_stop)(tp, 0);
1510 } else if (flag == 0) {
1514 CLR(tp->t_state, TS_CARR_ON);
1515 if (ISSET(tp->t_state, TS_ISOPEN) &&
1516 !ISSET(tp->t_cflag, CLOCAL)) {
1517 SET(tp->t_state, TS_ZOMBIE);
1518 CLR(tp->t_state, TS_CONNECTED);
1519 if (tp->t_session && tp->t_session->s_leader)
1520 psignal(tp->t_session->s_leader, SIGHUP);
1521 ttyflush(tp, FREAD | FWRITE);
1528 SET(tp->t_state, TS_CARR_ON);
1529 if (!ISSET(tp->t_state, TS_ZOMBIE))
1530 SET(tp->t_state, TS_CONNECTED);
1531 wakeup(TSA_CARR_ON(tp));
1539 * Reinput pending characters after state switch
1549 CLR(tp->t_lflag, PENDIN);
1550 SET(tp->t_state, TS_TYPEN);
1552 * XXX this assumes too much about clist internals. It may even
1553 * fail if the cblock slush pool is empty. We can't allocate more
1554 * cblocks here because we are called from an interrupt handler
1555 * and clist_alloc_cblocks() can wait.
1558 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1559 tp->t_rawq.c_cbmax = tq.c_cbmax;
1560 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1561 while ((c = getc(&tq)) >= 0)
1563 CLR(tp->t_state, TS_TYPEN);
1567 * Process a read call on a tty device.
1570 ttread(tp, uio, flag)
1578 cc_t *cc = tp->t_cc;
1580 int s, first, error = 0;
1581 int has_stime = 0, last_cc = 0;
1582 long slp = 0; /* XXX this should be renamed `timo'. */
1583 struct timeval stime;
1587 lflag = tp->t_lflag;
1589 * take pending input first
1591 if (ISSET(lflag, PENDIN)) {
1593 splx(s); /* reduce latency */
1595 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1599 * Hang process if it's in the background.
1601 if ((pp = curproc) && isbackground(pp, tp)) {
1603 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1604 SIGISMEMBER(pp->p_sigmask, SIGTTIN) ||
1605 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1607 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1608 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1614 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1616 return (0); /* EOF */
1620 * If canonical, use the canonical queue,
1621 * else use the raw queue.
1623 * (should get rid of clists...)
1625 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1627 if (flag & IO_NDELAY) {
1630 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1635 return (EWOULDBLOCK);
1637 if (!ISSET(lflag, ICANON)) {
1640 struct timeval timecopy;
1643 * Check each of the four combinations.
1644 * (m > 0 && t == 0) is the normal read case.
1645 * It should be fairly efficient, so we check that and its
1646 * companion case (m == 0 && t == 0) first.
1647 * For the other two cases, we compute the target sleep time
1656 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1660 t *= 100000; /* time in us */
1661 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1662 ((t1).tv_usec - (t2).tv_usec))
1668 getmicrotime(&timecopy);
1670 /* first character, start timer */
1674 } else if (qp->c_cc > last_cc) {
1675 /* got a character, restart timer */
1679 /* nothing, check expiration */
1680 slp = t - diff(timecopy, stime);
1685 } else { /* m == 0 */
1688 getmicrotime(&timecopy);
1694 slp = t - diff(timecopy, stime);
1696 /* Timed out, but 0 is enough input. */
1704 * Rounding down may make us wake up just short
1705 * of the target, so we round up.
1706 * The formula is ceiling(slp * hz/1000000).
1707 * 32-bit arithmetic is enough for hz < 169.
1708 * XXX see tvtohz() for how to avoid overflow if hz
1709 * is large (divide by `tick' and/or arrange to
1710 * use tvtohz() if hz is large).
1712 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1715 if (qp->c_cc <= 0) {
1718 * There is no input, or not enough input and we can block.
1720 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1721 ISSET(tp->t_state, TS_CONNECTED) ?
1722 "ttyin" : "ttyhup", (int)slp);
1724 if (error == EWOULDBLOCK)
1729 * XXX what happens if another process eats some input
1730 * while we are asleep (not just here)? It would be
1731 * safest to detect changes and reset our state variables
1732 * (has_stime and last_cc).
1740 * Input present, check for input mapping and processing.
1743 if (ISSET(lflag, ICANON | ISIG))
1749 icc = imin(uio->uio_resid, IBUFSIZ);
1750 icc = q_to_b(qp, ibuf, icc);
1756 error = uiomove(ibuf, icc, uio);
1758 * XXX if there was an error then we should ungetc() the
1759 * unmoved chars and reduce icc here.
1763 if (uio->uio_resid == 0)
1777 * delayed suspend (^Y)
1779 if (CCEQ(cc[VDSUSP], c) &&
1780 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1781 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1783 error = ttysleep(tp, &lbolt, PCATCH,
1792 * Interpret EOF only in canonical mode.
1794 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1797 * Give user character.
1799 error = ureadc(c, uio);
1801 /* XXX should ungetc(c, qp). */
1803 if (uio->uio_resid == 0)
1806 * In canonical mode check for a "break character"
1807 * marking the end of a "line of input".
1809 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1816 * Look to unblock input now that (presumably)
1817 * the input queue has gone down.
1820 if (ISSET(tp->t_state, TS_TBLOCK) &&
1821 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1829 * Check the output queue on tp for space for a kernel message (from uprintf
1830 * or tprintf). Allow some space over the normal hiwater mark so we don't
1831 * lose messages due to normal flow control, but don't let the tty run amok.
1832 * Sleeps here are not interruptible, but we return prematurely if new signals
1836 ttycheckoutq(tp, wait)
1843 hiwat = tp->t_ohiwat;
1844 SIGEMPTYSET(oldmask);
1847 oldmask = curproc->p_siglist;
1848 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1849 while (tp->t_outq.c_cc > hiwat) {
1851 if (tp->t_outq.c_cc <= hiwat)
1853 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1857 SET(tp->t_state, TS_SO_OLOWAT);
1858 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1865 * Process a write call on a tty device.
1868 ttwrite(tp, uio, flag)
1876 int i, hiwat, cnt, error, s;
1879 hiwat = tp->t_ohiwat;
1880 cnt = uio->uio_resid;
1885 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1887 if (uio->uio_resid == cnt)
1891 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1892 if (flag & IO_NDELAY) {
1894 error = EWOULDBLOCK;
1897 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1906 * Hang the process if it's in the background.
1908 if ((pp = curproc) && isbackground(pp, tp) &&
1909 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1910 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1911 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) {
1912 if (pp->p_pgrp->pg_jobc == 0) {
1916 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1917 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1923 * Process the user's data in at most OBUFSIZ chunks. Perform any
1924 * output translation. Keep track of high water mark, sleep on
1925 * overflow awaiting device aid in acquiring new space.
1927 while (uio->uio_resid > 0 || cc > 0) {
1928 if (ISSET(tp->t_lflag, FLUSHO)) {
1932 if (tp->t_outq.c_cc > hiwat)
1935 * Grab a hunk of data from the user, unless we have some
1936 * leftover from last time.
1939 cc = imin(uio->uio_resid, OBUFSIZ);
1941 error = uiomove(cp, cc, uio);
1948 * If nothing fancy need be done, grab those characters we
1949 * can handle without any of ttyoutput's processing and
1950 * just transfer them to the output q. For those chars
1951 * which require special processing (as indicated by the
1952 * bits in char_type), call ttyoutput. After processing
1953 * a hunk of data, look for FLUSHO so ^O's will take effect
1957 if (!ISSET(tp->t_oflag, OPOST))
1960 ce = cc - scanc((u_int)cc, (u_char *)cp,
1961 char_type, CCLASSMASK);
1963 * If ce is zero, then we're processing
1964 * a special character through ttyoutput.
1968 if (ttyoutput(*cp, tp) >= 0) {
1969 /* No Clists, wait a bit. */
1971 if (flag & IO_NDELAY) {
1972 error = EWOULDBLOCK;
1975 error = ttysleep(tp, &lbolt,
1984 if (ISSET(tp->t_lflag, FLUSHO) ||
1985 tp->t_outq.c_cc > hiwat)
1991 * A bunch of normal characters have been found.
1992 * Transfer them en masse to the output queue and
1993 * continue processing at the top of the loop.
1994 * If there are any further characters in this
1995 * <= OBUFSIZ chunk, the first should be a character
1996 * requiring special handling by ttyoutput.
1999 i = b_to_q(cp, ce, &tp->t_outq);
2002 cp += ce, cc -= ce, tk_nout += ce;
2005 /* No Clists, wait a bit. */
2007 if (flag & IO_NDELAY) {
2008 error = EWOULDBLOCK;
2011 error = ttysleep(tp, &lbolt, PCATCH,
2017 if (ISSET(tp->t_lflag, FLUSHO) ||
2018 tp->t_outq.c_cc > hiwat)
2025 * If cc is nonzero, we leave the uio structure inconsistent, as the
2026 * offset and iov pointers have moved forward, but it doesn't matter
2027 * (the call will either return short or restart with a new uio).
2029 uio->uio_resid += cc;
2036 * This can only occur if FLUSHO is set in t_lflag,
2037 * or if ttstart/oproc is synchronous (or very fast).
2039 if (tp->t_outq.c_cc <= hiwat) {
2043 if (flag & IO_NDELAY) {
2045 uio->uio_resid += cc;
2046 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2048 SET(tp->t_state, TS_SO_OLOWAT);
2049 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2051 if (error == EWOULDBLOCK)
2059 * Rubout one character from the rawq of tp
2060 * as cleanly as possible.
2071 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2073 CLR(tp->t_lflag, FLUSHO);
2074 if (ISSET(tp->t_lflag, ECHOE)) {
2075 if (tp->t_rocount == 0) {
2077 * Screwed by ttwrite; retype
2082 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2085 CLR(c, ~TTY_CHARMASK);
2086 switch (CCLASS(c)) {
2095 if (ISSET(tp->t_lflag, ECHOCTL))
2099 if (tp->t_rocount < tp->t_rawq.c_cc) {
2104 savecol = tp->t_column;
2105 SET(tp->t_state, TS_CNTTB);
2106 SET(tp->t_lflag, FLUSHO);
2107 tp->t_column = tp->t_rocol;
2108 cp = tp->t_rawq.c_cf;
2110 tabc = *cp; /* XXX FIX NEXTC */
2111 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2113 CLR(tp->t_lflag, FLUSHO);
2114 CLR(tp->t_state, TS_CNTTB);
2117 /* savecol will now be length of the tab. */
2118 savecol -= tp->t_column;
2119 tp->t_column += savecol;
2121 savecol = 8; /* overflow screw */
2122 while (--savecol >= 0)
2123 (void)ttyoutput('\b', tp);
2126 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2127 (void)printf(PANICSTR, c, CCLASS(c));
2129 panic(PANICSTR, c, CCLASS(c));
2133 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2134 if (!ISSET(tp->t_state, TS_ERASE)) {
2135 SET(tp->t_state, TS_ERASE);
2136 (void)ttyoutput('\\', tp);
2140 ttyecho(tp->t_cc[VERASE], tp);
2142 * This code may be executed not only when an ERASE key
2143 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2144 * So, I didn't think it was worthwhile to pass the extra
2145 * information (which would need an extra parameter,
2146 * changing every call) needed to distinguish the ERASE2
2147 * case from the ERASE.
2154 * Back over cnt characters, erasing them.
2163 (void)ttyoutput('\b', tp);
2164 (void)ttyoutput(' ', tp);
2165 (void)ttyoutput('\b', tp);
2171 * Reprint the rawq line. Note, it is assumed that c_cc has already
2181 /* Echo the reprint character. */
2182 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2183 ttyecho(tp->t_cc[VREPRINT], tp);
2185 (void)ttyoutput('\n', tp);
2189 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2190 * BIT OF FIRST CHAR.
2193 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2194 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2196 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2197 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2199 CLR(tp->t_state, TS_ERASE);
2202 tp->t_rocount = tp->t_rawq.c_cc;
2207 * Echo a typed character to the terminal.
2215 if (!ISSET(tp->t_state, TS_CNTTB))
2216 CLR(tp->t_lflag, FLUSHO);
2217 if ((!ISSET(tp->t_lflag, ECHO) &&
2218 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2219 ISSET(tp->t_lflag, EXTPROC))
2221 if (ISSET(tp->t_lflag, ECHOCTL) &&
2222 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2223 ISSET(c, TTY_CHARMASK) == 0177)) {
2224 (void)ttyoutput('^', tp);
2225 CLR(c, ~TTY_CHARMASK);
2231 (void)ttyoutput(c, tp);
2235 * Wake up any readers on a tty.
2242 if (tp->t_rsel.si_pid != 0)
2243 selwakeup(&tp->t_rsel);
2244 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2245 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2246 wakeup(TSA_HUP_OR_INPUT(tp));
2247 KNOTE(&tp->t_rsel.si_note, 0);
2251 * Wake up any writers on a tty.
2258 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2259 selwakeup(&tp->t_wsel);
2260 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2261 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2262 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2263 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2264 CLR(tp->t_state, TS_SO_OCOMPLETE);
2265 wakeup(TSA_OCOMPLETE(tp));
2267 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2268 tp->t_outq.c_cc <= tp->t_olowat) {
2269 CLR(tp->t_state, TS_SO_OLOWAT);
2270 wakeup(TSA_OLOWAT(tp));
2272 KNOTE(&tp->t_wsel.si_note, 0);
2276 * Look up a code for a specified speed in a conversion table;
2277 * used by drivers to map software speed values to hardware parameters.
2280 ttspeedtab(speed, table)
2282 struct speedtab *table;
2285 for ( ; table->sp_speed != -1; table++)
2286 if (table->sp_speed == speed)
2287 return (table->sp_code);
2292 * Set input and output watermarks and buffer sizes. For input, the
2293 * high watermark is about one second's worth of input above empty, the
2294 * low watermark is slightly below high water, and the buffer size is a
2295 * driver-dependent amount above high water. For output, the watermarks
2296 * are near the ends of the buffer, with about 1 second's worth of input
2297 * between them. All this only applies to the standard line discipline.
2303 int cps, ttmaxhiwat, x;
2306 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2307 switch (tp->t_ispeedwat) {
2309 cps = tp->t_ispeed / 10;
2313 * This case is for old drivers that don't know about
2314 * t_ispeedwat. Arrange for them to get the old buffer
2315 * sizes and watermarks.
2317 cps = TTYHOG - 2 * 256;
2318 tp->t_ififosize = 2 * 256;
2321 cps = tp->t_ispeedwat / 10;
2325 tp->t_ilowat = 7 * cps / 8;
2326 x = cps + tp->t_ififosize;
2327 clist_alloc_cblocks(&tp->t_rawq, x, x);
2330 switch (tp->t_ospeedwat) {
2332 cps = tp->t_ospeed / 10;
2333 ttmaxhiwat = 2 * TTMAXHIWAT;
2336 cps = tp->t_ospeed / 10;
2337 ttmaxhiwat = TTMAXHIWAT;
2340 cps = tp->t_ospeedwat / 10;
2341 ttmaxhiwat = 8 * TTMAXHIWAT;
2344 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2345 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2347 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2348 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2349 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2351 clist_alloc_cblocks(&tp->t_outq, x, x);
2356 * Report on state of foreground process group.
2362 struct proc *p, *pick;
2363 struct timeval utime, stime;
2366 if (ttycheckoutq(tp,0) == 0)
2370 * We always print the load average, then figure out what else to
2371 * print based on the state of the current process group.
2373 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2374 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2376 if (tp->t_session == NULL) {
2377 ttyprintf(tp, "not a controlling terminal\n");
2378 } else if (tp->t_pgrp == NULL) {
2379 ttyprintf(tp, "no foreground process group\n");
2380 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2381 ttyprintf(tp, "empty foreground process group\n");
2384 * Pick an interesting process. Note that certain elements,
2385 * in particular the wmesg, require a critical section for
2386 * safe access (YYY and we are still not MP safe).
2388 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2389 * p_thread->td_comm.
2399 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2400 if (proc_compare(pick, p))
2405 * Figure out what wait/process-state message, and command
2408 if (pick->p_thread == NULL)
2410 else if (pick->p_stat == SRUN)
2412 else if (pick->p_wmesg) /* p_thread must not be NULL */
2413 str = pick->p_wmesg;
2417 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2418 (pick->p_thread ? pick->p_comm : "?"),
2422 * Calculate cpu usage, percent cpu, and cmsz. Note that
2423 * 'pick' becomes invalid the moment we exit the critical
2426 if (pick->p_thread && (pick->p_flag & P_INMEM)) {
2427 calcru(pick, &utime, &stime, NULL);
2433 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2435 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2438 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2445 ttyprintf(tp, " %s ", buf);
2447 ttyprintf(tp, "%ld.%02ldu ",
2448 utime.tv_sec, utime.tv_usec / 10000);
2449 ttyprintf(tp, "%ld.%02lds ",
2450 stime.tv_sec, stime.tv_usec / 10000);
2452 ttyprintf(tp, "?.??u ?.??s ");
2454 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2456 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2460 * Returns 1 if p2 is "better" than p1
2462 * The algorithm for picking the "interesting" process is thus:
2464 * 1) Only foreground processes are eligible - implied.
2465 * 2) Runnable processes are favored over anything else. The runner
2466 * with the highest cpu utilization is picked (p_estcpu). Ties are
2467 * broken by picking the highest pid.
2468 * 3) The sleeper with the shortest sleep time is next. With ties,
2469 * we pick out just "short-term" sleepers (P_SINTR == 0).
2470 * 4) Further ties are broken by picking the highest pid.
2472 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2473 #define TESTAB(a, b) ((a)<<1 | (b))
2479 proc_compare(p1, p2)
2480 struct proc *p1, *p2;
2486 * see if at least one of them is runnable
2488 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2495 * tie - favor one with highest recent cpu utilization
2497 if (p2->p_estcpu > p1->p_estcpu)
2499 if (p1->p_estcpu > p2->p_estcpu)
2501 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2506 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2512 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2515 * pick the one with the smallest sleep time
2517 if (p2->p_slptime > p1->p_slptime)
2519 if (p1->p_slptime > p2->p_slptime)
2522 * favor one sleeping in a non-interruptible sleep
2524 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2526 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2528 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2532 * Output char to tty; console putchar style.
2542 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2547 (void)ttyoutput('\r', tp);
2548 (void)ttyoutput(c, tp);
2555 * Sleep on chan, returning ERESTART if tty changed while we napped and
2556 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2557 * the tty is revoked, restarting a pending call will redo validation done
2558 * at the start of the call.
2561 ttysleep(tp, chan, slpflags, wmesg, timo)
2571 error = tsleep(chan, slpflags, wmesg, timo);
2574 return (tp->t_gen == gen ? 0 : ERESTART);
2578 * Allocate a tty struct. Clists in the struct will be allocated by
2588 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2595 * Free a tty struct. Clists in the struct should have been freed by
2598 * XXX not yet usable: since we support a half-closed state and do not
2599 * ref count the tty reference from the session, it is possible for a
2600 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2614 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2618 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2622 SLIST_FOREACH(tp, &tty_list, t_list) {
2625 t.t_dev = (dev_t)dev2udev(t.t_dev);
2626 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2633 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2634 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2646 ttyread(dev, uio, flag)
2656 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2660 ttywrite(dev, uio, flag)
2670 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));