2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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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 1.14 2004/10/12 19:20:46 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 * list of struct tty where pstat(8) can pick it up with sysctl
204 static SLIST_HEAD(, tty) tty_list;
207 * Initial open of tty, or (re)entry to standard tty line discipline.
218 if (!ISSET(tp->t_state, TS_ISOPEN)) {
219 SET(tp->t_state, TS_ISOPEN);
220 if (ISSET(tp->t_cflag, CLOCAL))
221 SET(tp->t_state, TS_CONNECTED);
222 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
230 * Handle close() on a tty line: flush and set to initial state,
231 * bumping generation number so that pending read/write calls
232 * can detect recycling of the tty.
234 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
235 * and l_close() should have flushed, but we repeat the spltty() and
236 * the flush in case there are buggy callers.
244 funsetown(tp->t_sigio);
249 ttyflush(tp, FREAD | FWRITE);
250 clist_free_cblocks(&tp->t_canq);
251 clist_free_cblocks(&tp->t_outq);
252 clist_free_cblocks(&tp->t_rawq);
255 tp->t_line = TTYDISC;
263 * Disassociate the tty from its session. Traditionally this has only been
264 * a half-close, meaning that the session was still allowed to point at the
265 * tty (resulting in the tty in the ps command showing something like 'p0-'),
266 * even though the tty is no longer pointing at the session.
268 * The half close seems to be useful only for 'ps' output but there is as
269 * yet no reason to remove the feature. The full-close code is currently
270 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
273 ttyclearsession(struct tty *tp)
278 if ((sp = tp->t_session) != NULL) {
279 tp->t_session = NULL;
280 #ifdef TTY_DO_FULL_CLOSE
281 /* FULL CLOSE (not yet) */
282 if (sp->s_ttyp == tp) {
285 printf("ttyclearsession: warning: sp->s_ttyp != tp "
286 "%p/%p\n", sp->s_ttyp, tp);
293 * Terminate the tty vnode association for a session. This is the
294 * 'other half' of the close.
297 ttyclosesession(struct session *sp, int dorele)
300 struct thread *td = curthread;
302 if ((vp = sp->s_ttyvp) == NULL)
305 if (vp->v_flag & VCTTYISOPEN) {
306 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td) == 0) {
307 vclrflags(vp, VCTTYISOPEN);
308 VOP_CLOSE(vp, 0, td);
309 VOP_UNLOCK(vp, 0, td);
317 #define FLUSHQ(q) { \
319 ndflush(q, (q)->c_cc); \
322 /* Is 'c' a line delimiter ("break" character)? */
323 #define TTBREAKC(c, lflag) \
324 ((c) == '\n' || (((c) == cc[VEOF] || \
325 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
326 (c) != _POSIX_VDISABLE))
329 * Process input of a single character received on a tty.
336 tcflag_t iflag, lflag;
341 * If input is pending take it first.
344 if (ISSET(lflag, PENDIN))
349 if (ISSET(lflag, ICANON)) {
359 * Block further input iff:
360 * current input > threshold AND input is available to user program
361 * AND input flow control is enabled and not yet invoked.
362 * The 3 is slop for PARMRK.
365 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
366 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
367 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
368 !ISSET(tp->t_state, TS_TBLOCK))
371 /* Handle exceptional conditions (break, parity, framing). */
373 err = (ISSET(c, TTY_ERRORMASK));
375 CLR(c, TTY_ERRORMASK);
376 if (ISSET(err, TTY_BI)) {
377 if (ISSET(iflag, IGNBRK))
379 if (ISSET(iflag, BRKINT)) {
380 ttyflush(tp, FREAD | FWRITE);
381 pgsignal(tp->t_pgrp, SIGINT, 1);
384 if (ISSET(iflag, PARMRK))
386 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
387 || ISSET(err, TTY_FE)) {
388 if (ISSET(iflag, IGNPAR))
390 else if (ISSET(iflag, PARMRK)) {
392 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
395 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
396 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
397 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
404 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
406 if (!ISSET(lflag, EXTPROC)) {
408 * Check for literal nexting very first
410 if (ISSET(tp->t_state, TS_LNCH)) {
412 CLR(tp->t_state, TS_LNCH);
415 * Scan for special characters. This code
416 * is really just a big case statement with
417 * non-constant cases. The bottom of the
418 * case statement is labeled ``endcase'', so goto
419 * it after a case match, or similar.
423 * Control chars which aren't controlled
424 * by ICANON, ISIG, or IXON.
426 if (ISSET(lflag, IEXTEN)) {
427 if (CCEQ(cc[VLNEXT], c)) {
428 if (ISSET(lflag, ECHO)) {
429 if (ISSET(lflag, ECHOE)) {
430 (void)ttyoutput('^', tp);
431 (void)ttyoutput('\b', tp);
435 SET(tp->t_state, TS_LNCH);
438 if (CCEQ(cc[VDISCARD], c)) {
439 if (ISSET(lflag, FLUSHO))
440 CLR(tp->t_lflag, FLUSHO);
442 ttyflush(tp, FWRITE);
444 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
446 SET(tp->t_lflag, FLUSHO);
454 if (ISSET(lflag, ISIG)) {
455 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
456 if (!ISSET(lflag, NOFLSH))
457 ttyflush(tp, FREAD | FWRITE);
460 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
463 if (CCEQ(cc[VSUSP], c)) {
464 if (!ISSET(lflag, NOFLSH))
467 pgsignal(tp->t_pgrp, SIGTSTP, 1);
472 * Handle start/stop characters.
474 if (ISSET(iflag, IXON)) {
475 if (CCEQ(cc[VSTOP], c)) {
476 if (!ISSET(tp->t_state, TS_TTSTOP)) {
477 SET(tp->t_state, TS_TTSTOP);
478 (*tp->t_stop)(tp, 0);
481 if (!CCEQ(cc[VSTART], c))
484 * if VSTART == VSTOP then toggle
488 if (CCEQ(cc[VSTART], c))
492 * IGNCR, ICRNL, & INLCR
495 if (ISSET(iflag, IGNCR))
497 else if (ISSET(iflag, ICRNL))
499 } else if (c == '\n' && ISSET(iflag, INLCR))
502 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
504 * From here on down canonical mode character
505 * processing takes place.
508 * erase or erase2 (^H / ^?)
510 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
512 ttyrub(unputc(&tp->t_rawq), tp);
518 if (CCEQ(cc[VKILL], c)) {
519 if (ISSET(lflag, ECHOKE) &&
520 tp->t_rawq.c_cc == tp->t_rocount &&
521 !ISSET(lflag, ECHOPRT))
522 while (tp->t_rawq.c_cc)
523 ttyrub(unputc(&tp->t_rawq), tp);
526 if (ISSET(lflag, ECHOK) ||
527 ISSET(lflag, ECHOKE))
532 CLR(tp->t_state, TS_LOCAL);
538 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
544 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
549 * erase last char of word and remember the
550 * next chars type (for ALTWERASE)
553 c = unputc(&tp->t_rawq);
556 if (c == ' ' || c == '\t') {
557 (void)putc(c, &tp->t_rawq);
566 c = unputc(&tp->t_rawq);
569 } while (c != ' ' && c != '\t' &&
570 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
571 (void)putc(c, &tp->t_rawq);
577 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
582 * ^T - kernel info and generate SIGINFO
584 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
585 if (ISSET(lflag, ISIG))
586 pgsignal(tp->t_pgrp, SIGINFO, 1);
587 if (!ISSET(lflag, NOKERNINFO))
591 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
592 if (ISSET(lflag, ISIG))
593 pgsignal(tp->t_pgrp, SIGCKPT, 1);
598 * Check for input buffer overflow
600 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
602 if (ISSET(iflag, IMAXBEL)) {
603 if (tp->t_outq.c_cc < tp->t_ohiwat)
604 (void)ttyoutput(CTRL('g'), tp);
609 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
610 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
611 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
614 * Put data char in q for user and
615 * wakeup on seeing a line delimiter.
617 if (putc(c, &tp->t_rawq) >= 0) {
618 if (!ISSET(lflag, ICANON)) {
623 if (TTBREAKC(c, lflag)) {
625 catq(&tp->t_rawq, &tp->t_canq);
627 } else if (tp->t_rocount++ == 0)
628 tp->t_rocol = tp->t_column;
629 if (ISSET(tp->t_state, TS_ERASE)) {
631 * end of prterase \.../
633 CLR(tp->t_state, TS_ERASE);
634 (void)ttyoutput('/', tp);
638 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
640 * Place the cursor over the '^' of the ^D.
642 i = imin(2, tp->t_column - i);
644 (void)ttyoutput('\b', tp);
651 * IXANY means allow any character to restart output.
653 if (ISSET(tp->t_state, TS_TTSTOP) &&
654 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
657 CLR(tp->t_lflag, FLUSHO);
658 CLR(tp->t_state, TS_TTSTOP);
660 return (ttstart(tp));
664 * Output a single character on a tty, doing output processing
665 * as needed (expanding tabs, newline processing, etc.).
666 * Returns < 0 if succeeds, otherwise returns char to resend.
678 if (!ISSET(oflag, OPOST)) {
679 if (ISSET(tp->t_lflag, FLUSHO))
681 if (putc(c, &tp->t_outq))
688 * Do tab expansion if OXTABS is set. Special case if we external
689 * processing, we don't do the tab expansion because we'll probably
690 * get it wrong. If tab expansion needs to be done, let it happen
693 CLR(c, ~TTY_CHARMASK);
695 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
696 c = 8 - (tp->t_column & 7);
697 if (!ISSET(tp->t_lflag, FLUSHO)) {
698 s = spltty(); /* Don't interrupt tabs. */
699 c -= b_to_q(" ", c, &tp->t_outq);
705 return (c ? -1 : '\t');
707 if (c == CEOT && ISSET(oflag, ONOEOT))
711 * Newline translation: if ONLCR is set,
712 * translate newline into "\r\n".
714 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
717 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
720 /* If OCRNL is set, translate "\r" into "\n". */
721 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
723 /* If ONOCR is set, don't transmit CRs when on column 0. */
724 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
729 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
741 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
751 col = (col + 8) & ~7;
759 * Ioctls for all tty devices. Called after line-discipline specific ioctl
760 * has been called to do discipline-specific functions and/or reject any
761 * of these ioctl commands.
765 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
767 struct thread *td = curthread;
768 struct proc *p = td->td_proc;
773 /* If the ioctl involves modification, hang if in the background. */
797 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
807 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
808 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
809 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
810 if (p->p_pgrp->pg_jobc == 0)
812 pgsignal(p->p_pgrp, SIGTTOU, 1);
813 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
821 switch (cmd) { /* Process the ioctl. */
822 case FIOASYNC: /* set/clear async i/o */
825 SET(tp->t_state, TS_ASYNC);
827 CLR(tp->t_state, TS_ASYNC);
830 case FIONBIO: /* set/clear non-blocking i/o */
831 break; /* XXX: delete. */
832 case FIONREAD: /* get # bytes to read */
834 *(int *)data = ttnread(tp);
840 * Policy -- Don't allow FIOSETOWN on someone else's
843 if (tp->t_session != NULL && !isctty(p, tp))
846 error = fsetown(*(int *)data, &tp->t_sigio);
851 if (tp->t_session != NULL && !isctty(p, tp))
853 *(int *)data = fgetown(tp->t_sigio);
856 case TIOCEXCL: /* set exclusive use of tty */
858 SET(tp->t_state, TS_XCLUDE);
861 case TIOCFLUSH: { /* flush buffers */
862 int flags = *(int *)data;
865 flags = FREAD | FWRITE;
867 flags &= FREAD | FWRITE;
871 case TIOCCONS: /* become virtual console */
873 if (constty && constty != tp &&
874 ISSET(constty->t_state, TS_CONNECTED))
877 if ((error = suser(td)) != 0)
881 } else if (tp == constty)
884 case TIOCDRAIN: /* wait till output drained */
889 case TIOCGETA: { /* get termios struct */
890 struct termios *t = (struct termios *)data;
892 bcopy(&tp->t_termios, t, sizeof(struct termios));
895 case TIOCGETD: /* get line discipline */
896 *(int *)data = tp->t_line;
898 case TIOCGWINSZ: /* get window size */
899 *(struct winsize *)data = tp->t_winsize;
901 case TIOCGPGRP: /* get pgrp of tty */
904 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
907 case TIOCHPCL: /* hang up on last close */
909 SET(tp->t_cflag, HUPCL);
913 case TIOCNXCL: /* reset exclusive use of tty */
915 CLR(tp->t_state, TS_XCLUDE);
918 case TIOCOUTQ: /* output queue size */
919 *(int *)data = tp->t_outq.c_cc;
921 case TIOCSETA: /* set termios struct */
922 case TIOCSETAW: /* drain output, set */
923 case TIOCSETAF: { /* drn out, fls in, set */
924 struct termios *t = (struct termios *)data;
926 if (t->c_ispeed == 0)
927 t->c_ispeed = t->c_ospeed;
928 if (t->c_ispeed == 0)
929 t->c_ispeed = tp->t_ospeed;
930 if (t->c_ispeed == 0)
933 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
939 if (cmd == TIOCSETAF)
942 if (!ISSET(t->c_cflag, CIGNORE)) {
944 * Set device hardware.
946 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
950 if (ISSET(t->c_cflag, CLOCAL) &&
951 !ISSET(tp->t_cflag, CLOCAL)) {
953 * XXX disconnections would be too hard to
954 * get rid of without this kludge. The only
955 * way to get rid of controlling terminals
956 * is to exit from the session leader.
958 CLR(tp->t_state, TS_ZOMBIE);
960 wakeup(TSA_CARR_ON(tp));
964 if ((ISSET(tp->t_state, TS_CARR_ON) ||
965 ISSET(t->c_cflag, CLOCAL)) &&
966 !ISSET(tp->t_state, TS_ZOMBIE))
967 SET(tp->t_state, TS_CONNECTED);
969 CLR(tp->t_state, TS_CONNECTED);
970 tp->t_cflag = t->c_cflag;
971 tp->t_ispeed = t->c_ispeed;
972 if (t->c_ospeed != 0)
973 tp->t_ospeed = t->c_ospeed;
976 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
978 if (ISSET(t->c_lflag, ICANON))
979 SET(tp->t_lflag, PENDIN);
982 * XXX we really shouldn't allow toggling
983 * ICANON while we're in a non-termios line
984 * discipline. Now we have to worry about
985 * panicing for a null queue.
987 if (tp->t_canq.c_cbreserved > 0 &&
988 tp->t_rawq.c_cbreserved > 0) {
989 catq(&tp->t_rawq, &tp->t_canq);
991 * XXX the queue limits may be
992 * different, so the old queue
993 * swapping method no longer works.
995 catq(&tp->t_canq, &tp->t_rawq);
997 CLR(tp->t_lflag, PENDIN);
1001 tp->t_iflag = t->c_iflag;
1002 tp->t_oflag = t->c_oflag;
1004 * Make the EXTPROC bit read only.
1006 if (ISSET(tp->t_lflag, EXTPROC))
1007 SET(t->c_lflag, EXTPROC);
1009 CLR(t->c_lflag, EXTPROC);
1010 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1011 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1012 t->c_cc[VTIME] != tp->t_cc[VTIME])
1014 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1018 case TIOCSETD: { /* set line discipline */
1019 int t = *(int *)data;
1020 dev_t device = tp->t_dev;
1022 if ((u_int)t >= nlinesw)
1024 if (t != tp->t_line) {
1026 (*linesw[tp->t_line].l_close)(tp, flag);
1027 error = (*linesw[t].l_open)(device, tp);
1029 (void)(*linesw[tp->t_line].l_open)(device, tp);
1038 case TIOCSTART: /* start output, like ^Q */
1040 if (ISSET(tp->t_state, TS_TTSTOP) ||
1041 ISSET(tp->t_lflag, FLUSHO)) {
1042 CLR(tp->t_lflag, FLUSHO);
1043 CLR(tp->t_state, TS_TTSTOP);
1048 case TIOCSTI: /* simulate terminal input */
1049 if ((flag & FREAD) == 0 && suser(td))
1051 if (!isctty(p, tp) && suser(td))
1054 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1057 case TIOCSTOP: /* stop output, like ^S */
1059 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1060 SET(tp->t_state, TS_TTSTOP);
1061 (*tp->t_stop)(tp, 0);
1065 case TIOCSCTTY: /* become controlling tty */
1066 /* Session ctty vnode pointer set in vnode layer. */
1067 if (!SESS_LEADER(p) ||
1068 ((p->p_session->s_ttyvp || tp->t_session) &&
1069 (tp->t_session != p->p_session)))
1071 tp->t_session = p->p_session;
1072 tp->t_pgrp = p->p_pgrp;
1073 p->p_session->s_ttyp = tp;
1074 p->p_flag |= P_CONTROLT;
1076 case TIOCSPGRP: { /* set pgrp of tty */
1077 struct pgrp *pgrp = pgfind(*(int *)data);
1081 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1086 case TIOCSTAT: /* simulate control-T */
1091 case TIOCSWINSZ: /* set window size */
1092 if (bcmp((caddr_t)&tp->t_winsize, data,
1093 sizeof (struct winsize))) {
1094 tp->t_winsize = *(struct winsize *)data;
1095 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1098 case TIOCSDRAINWAIT:
1102 tp->t_timeout = *(int *)data * hz;
1103 wakeup(TSA_OCOMPLETE(tp));
1104 wakeup(TSA_OLOWAT(tp));
1106 case TIOCGDRAINWAIT:
1107 *(int *)data = tp->t_timeout / hz;
1110 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1111 return (ttcompat(tp, cmd, data, flag));
1120 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;
1167 switch (kn->kn_filter) {
1169 klist = &tp->t_rsel.si_note;
1170 kn->kn_fop = &ttyread_filtops;
1173 klist = &tp->t_wsel.si_note;
1174 kn->kn_fop = &ttywrite_filtops;
1180 kn->kn_hook = (caddr_t)dev;
1183 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1190 filt_ttyrdetach(struct knote *kn)
1192 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1195 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1200 filt_ttyread(struct knote *kn, long hint)
1202 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1204 kn->kn_data = ttnread(tp);
1205 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1206 kn->kn_flags |= EV_EOF;
1209 return (kn->kn_data > 0);
1213 filt_ttywdetach(struct knote *kn)
1215 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1218 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1223 filt_ttywrite(kn, hint)
1227 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1229 kn->kn_data = tp->t_outq.c_cc;
1230 if (ISSET(tp->t_state, TS_ZOMBIE))
1232 return (kn->kn_data <= tp->t_olowat &&
1233 ISSET(tp->t_state, TS_CONNECTED));
1237 * Must be called at spltty().
1245 if (ISSET(tp->t_lflag, PENDIN))
1247 nread = tp->t_canq.c_cc;
1248 if (!ISSET(tp->t_lflag, ICANON)) {
1249 nread += tp->t_rawq.c_cc;
1250 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1257 * Wait for output to drain.
1267 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1268 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1270 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1271 ISSET(tp->t_state, TS_CONNECTED)) {
1272 SET(tp->t_state, TS_SO_OCOMPLETE);
1273 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1277 if (error == EWOULDBLOCK)
1284 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1291 * Flush if successfully wait.
1299 if ((error = ttywait(tp)) == 0)
1300 ttyflush(tp, FREAD);
1305 * Flush tty read and/or write queues, notifying anyone waiting.
1319 FLUSHQ(&tp->t_outq);
1320 CLR(tp->t_state, TS_TTSTOP);
1322 (*tp->t_stop)(tp, rw);
1324 FLUSHQ(&tp->t_canq);
1325 FLUSHQ(&tp->t_rawq);
1326 CLR(tp->t_lflag, PENDIN);
1329 CLR(tp->t_state, TS_LOCAL);
1331 if (ISSET(tp->t_state, TS_TBLOCK)) {
1333 FLUSHQ(&tp->t_outq);
1337 * Don't let leave any state that might clobber the
1338 * next line discipline (although we should do more
1339 * to send the START char). Not clearing the state
1340 * may have caused the "putc to a clist with no
1341 * reserved cblocks" panic/printf.
1343 CLR(tp->t_state, TS_TBLOCK);
1345 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1346 if (ISSET(tp->t_iflag, IXOFF)) {
1348 * XXX wait a bit in the hope that the stop
1349 * character (if any) will go out. Waiting
1350 * isn't good since it allows races. This
1351 * will be fixed when the stop character is
1352 * put in a special queue. Don't bother with
1353 * the checks in ttywait() since the timeout
1356 SET(tp->t_state, TS_SO_OCOMPLETE);
1357 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1360 * Don't try sending the stop character again.
1362 CLR(tp->t_state, TS_TBLOCK);
1369 FLUSHQ(&tp->t_outq);
1376 * Copy in the default termios characters.
1383 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1394 termioschars(&tp->t_termios);
1398 * Handle input high water. Send stop character for the IXOFF case. Turn
1399 * on our input flow control bit and propagate the changes to the driver.
1400 * XXX the stop character should be put in a special high priority queue.
1407 SET(tp->t_state, TS_TBLOCK);
1408 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1409 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1410 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1415 * Handle input low water. Send start character for the IXOFF case. Turn
1416 * off our input flow control bit and propagate the changes to the driver.
1417 * XXX the start character should be put in a special high priority queue.
1424 CLR(tp->t_state, TS_TBLOCK);
1425 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1426 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1427 SET(tp->t_state, TS_TBLOCK); /* try again later */
1432 /* Not used by any current (i386) drivers. */
1434 * Restart after an inter-char delay.
1443 KASSERT(tp_arg != NULL, ("ttrstrt"));
1448 CLR(tp->t_state, TS_TIMEOUT);
1460 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1466 * "close" a line discipline
1474 if (flag & FNONBLOCK || ttywflush(tp))
1475 ttyflush(tp, FREAD | FWRITE);
1480 * Handle modem control transition on a tty.
1481 * Flag indicates new state of carrier.
1482 * Returns 0 if the line should be turned off, otherwise 1.
1490 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1492 * MDMBUF: do flow control according to carrier flag
1493 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1494 * works if IXON and IXANY are clear.
1497 CLR(tp->t_state, TS_CAR_OFLOW);
1498 CLR(tp->t_state, TS_TTSTOP);
1500 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1501 SET(tp->t_state, TS_CAR_OFLOW);
1502 SET(tp->t_state, TS_TTSTOP);
1503 (*tp->t_stop)(tp, 0);
1505 } else if (flag == 0) {
1509 CLR(tp->t_state, TS_CARR_ON);
1510 if (ISSET(tp->t_state, TS_ISOPEN) &&
1511 !ISSET(tp->t_cflag, CLOCAL)) {
1512 SET(tp->t_state, TS_ZOMBIE);
1513 CLR(tp->t_state, TS_CONNECTED);
1514 if (tp->t_session && tp->t_session->s_leader)
1515 psignal(tp->t_session->s_leader, SIGHUP);
1516 ttyflush(tp, FREAD | FWRITE);
1523 SET(tp->t_state, TS_CARR_ON);
1524 if (!ISSET(tp->t_state, TS_ZOMBIE))
1525 SET(tp->t_state, TS_CONNECTED);
1526 wakeup(TSA_CARR_ON(tp));
1534 * Reinput pending characters after state switch
1544 CLR(tp->t_lflag, PENDIN);
1545 SET(tp->t_state, TS_TYPEN);
1547 * XXX this assumes too much about clist internals. It may even
1548 * fail if the cblock slush pool is empty. We can't allocate more
1549 * cblocks here because we are called from an interrupt handler
1550 * and clist_alloc_cblocks() can wait.
1553 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1554 tp->t_rawq.c_cbmax = tq.c_cbmax;
1555 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1556 while ((c = getc(&tq)) >= 0)
1558 CLR(tp->t_state, TS_TYPEN);
1562 * Process a read call on a tty device.
1565 ttread(tp, uio, flag)
1573 cc_t *cc = tp->t_cc;
1574 struct proc *p = curproc;
1575 int s, first, error = 0;
1576 int has_stime = 0, last_cc = 0;
1577 long slp = 0; /* XXX this should be renamed `timo'. */
1578 struct timeval stime;
1582 lflag = tp->t_lflag;
1584 * take pending input first
1586 if (ISSET(lflag, PENDIN)) {
1588 splx(s); /* reduce latency */
1590 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1594 * Hang process if it's in the background.
1596 if (isbackground(p, tp)) {
1598 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1599 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1600 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1602 pgsignal(p->p_pgrp, SIGTTIN, 1);
1603 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1609 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1611 return (0); /* EOF */
1615 * If canonical, use the canonical queue,
1616 * else use the raw queue.
1618 * (should get rid of clists...)
1620 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1622 if (flag & IO_NDELAY) {
1625 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1630 return (EWOULDBLOCK);
1632 if (!ISSET(lflag, ICANON)) {
1635 struct timeval timecopy;
1638 * Check each of the four combinations.
1639 * (m > 0 && t == 0) is the normal read case.
1640 * It should be fairly efficient, so we check that and its
1641 * companion case (m == 0 && t == 0) first.
1642 * For the other two cases, we compute the target sleep time
1651 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1655 t *= 100000; /* time in us */
1656 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1657 ((t1).tv_usec - (t2).tv_usec))
1663 getmicrotime(&timecopy);
1665 /* first character, start timer */
1669 } else if (qp->c_cc > last_cc) {
1670 /* got a character, restart timer */
1674 /* nothing, check expiration */
1675 slp = t - diff(timecopy, stime);
1680 } else { /* m == 0 */
1683 getmicrotime(&timecopy);
1689 slp = t - diff(timecopy, stime);
1691 /* Timed out, but 0 is enough input. */
1699 * Rounding down may make us wake up just short
1700 * of the target, so we round up.
1701 * The formula is ceiling(slp * hz/1000000).
1702 * 32-bit arithmetic is enough for hz < 169.
1703 * XXX see tvtohz() for how to avoid overflow if hz
1704 * is large (divide by `tick' and/or arrange to
1705 * use tvtohz() if hz is large).
1707 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1710 if (qp->c_cc <= 0) {
1713 * There is no input, or not enough input and we can block.
1715 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1716 ISSET(tp->t_state, TS_CONNECTED) ?
1717 "ttyin" : "ttyhup", (int)slp);
1719 if (error == EWOULDBLOCK)
1724 * XXX what happens if another process eats some input
1725 * while we are asleep (not just here)? It would be
1726 * safest to detect changes and reset our state variables
1727 * (has_stime and last_cc).
1735 * Input present, check for input mapping and processing.
1738 if (ISSET(lflag, ICANON | ISIG))
1744 icc = imin(uio->uio_resid, IBUFSIZ);
1745 icc = q_to_b(qp, ibuf, icc);
1751 error = uiomove(ibuf, icc, uio);
1753 * XXX if there was an error then we should ungetc() the
1754 * unmoved chars and reduce icc here.
1758 if (uio->uio_resid == 0)
1772 * delayed suspend (^Y)
1774 if (CCEQ(cc[VDSUSP], c) &&
1775 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1776 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1778 error = ttysleep(tp, &lbolt, PCATCH,
1787 * Interpret EOF only in canonical mode.
1789 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1792 * Give user character.
1794 error = ureadc(c, uio);
1796 /* XXX should ungetc(c, qp). */
1798 if (uio->uio_resid == 0)
1801 * In canonical mode check for a "break character"
1802 * marking the end of a "line of input".
1804 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1811 * Look to unblock input now that (presumably)
1812 * the input queue has gone down.
1815 if (ISSET(tp->t_state, TS_TBLOCK) &&
1816 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1824 * Check the output queue on tp for space for a kernel message (from uprintf
1825 * or tprintf). Allow some space over the normal hiwater mark so we don't
1826 * lose messages due to normal flow control, but don't let the tty run amok.
1827 * Sleeps here are not interruptible, but we return prematurely if new signals
1831 ttycheckoutq(tp, wait)
1838 hiwat = tp->t_ohiwat;
1839 SIGEMPTYSET(oldmask);
1842 oldmask = curproc->p_siglist;
1843 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1844 while (tp->t_outq.c_cc > hiwat) {
1846 if (tp->t_outq.c_cc <= hiwat)
1848 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1852 SET(tp->t_state, TS_SO_OLOWAT);
1853 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1860 * Process a write call on a tty device.
1863 ttwrite(tp, uio, flag)
1871 int i, hiwat, cnt, error, s;
1874 hiwat = tp->t_ohiwat;
1875 cnt = uio->uio_resid;
1880 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1882 if (uio->uio_resid == cnt)
1886 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1887 if (flag & IO_NDELAY) {
1889 error = EWOULDBLOCK;
1892 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1900 * Hang the process if it's in the background.
1903 if (isbackground(p, tp) &&
1904 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1905 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1906 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1907 if (p->p_pgrp->pg_jobc == 0) {
1911 pgsignal(p->p_pgrp, SIGTTOU, 1);
1912 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1918 * Process the user's data in at most OBUFSIZ chunks. Perform any
1919 * output translation. Keep track of high water mark, sleep on
1920 * overflow awaiting device aid in acquiring new space.
1922 while (uio->uio_resid > 0 || cc > 0) {
1923 if (ISSET(tp->t_lflag, FLUSHO)) {
1927 if (tp->t_outq.c_cc > hiwat)
1930 * Grab a hunk of data from the user, unless we have some
1931 * leftover from last time.
1934 cc = imin(uio->uio_resid, OBUFSIZ);
1936 error = uiomove(cp, cc, uio);
1943 * If nothing fancy need be done, grab those characters we
1944 * can handle without any of ttyoutput's processing and
1945 * just transfer them to the output q. For those chars
1946 * which require special processing (as indicated by the
1947 * bits in char_type), call ttyoutput. After processing
1948 * a hunk of data, look for FLUSHO so ^O's will take effect
1952 if (!ISSET(tp->t_oflag, OPOST))
1955 ce = cc - scanc((u_int)cc, (u_char *)cp,
1956 char_type, CCLASSMASK);
1958 * If ce is zero, then we're processing
1959 * a special character through ttyoutput.
1963 if (ttyoutput(*cp, tp) >= 0) {
1964 /* No Clists, wait a bit. */
1966 if (flag & IO_NDELAY) {
1967 error = EWOULDBLOCK;
1970 error = ttysleep(tp, &lbolt,
1979 if (ISSET(tp->t_lflag, FLUSHO) ||
1980 tp->t_outq.c_cc > hiwat)
1986 * A bunch of normal characters have been found.
1987 * Transfer them en masse to the output queue and
1988 * continue processing at the top of the loop.
1989 * If there are any further characters in this
1990 * <= OBUFSIZ chunk, the first should be a character
1991 * requiring special handling by ttyoutput.
1994 i = b_to_q(cp, ce, &tp->t_outq);
1997 cp += ce, cc -= ce, tk_nout += ce;
2000 /* No Clists, wait a bit. */
2002 if (flag & IO_NDELAY) {
2003 error = EWOULDBLOCK;
2006 error = ttysleep(tp, &lbolt, PCATCH,
2012 if (ISSET(tp->t_lflag, FLUSHO) ||
2013 tp->t_outq.c_cc > hiwat)
2020 * If cc is nonzero, we leave the uio structure inconsistent, as the
2021 * offset and iov pointers have moved forward, but it doesn't matter
2022 * (the call will either return short or restart with a new uio).
2024 uio->uio_resid += cc;
2031 * This can only occur if FLUSHO is set in t_lflag,
2032 * or if ttstart/oproc is synchronous (or very fast).
2034 if (tp->t_outq.c_cc <= hiwat) {
2038 if (flag & IO_NDELAY) {
2040 uio->uio_resid += cc;
2041 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2043 SET(tp->t_state, TS_SO_OLOWAT);
2044 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2046 if (error == EWOULDBLOCK)
2054 * Rubout one character from the rawq of tp
2055 * as cleanly as possible.
2066 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2068 CLR(tp->t_lflag, FLUSHO);
2069 if (ISSET(tp->t_lflag, ECHOE)) {
2070 if (tp->t_rocount == 0) {
2072 * Screwed by ttwrite; retype
2077 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2080 CLR(c, ~TTY_CHARMASK);
2081 switch (CCLASS(c)) {
2090 if (ISSET(tp->t_lflag, ECHOCTL))
2094 if (tp->t_rocount < tp->t_rawq.c_cc) {
2099 savecol = tp->t_column;
2100 SET(tp->t_state, TS_CNTTB);
2101 SET(tp->t_lflag, FLUSHO);
2102 tp->t_column = tp->t_rocol;
2103 cp = tp->t_rawq.c_cf;
2105 tabc = *cp; /* XXX FIX NEXTC */
2106 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2108 CLR(tp->t_lflag, FLUSHO);
2109 CLR(tp->t_state, TS_CNTTB);
2112 /* savecol will now be length of the tab. */
2113 savecol -= tp->t_column;
2114 tp->t_column += savecol;
2116 savecol = 8; /* overflow screw */
2117 while (--savecol >= 0)
2118 (void)ttyoutput('\b', tp);
2121 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2122 (void)printf(PANICSTR, c, CCLASS(c));
2124 panic(PANICSTR, c, CCLASS(c));
2128 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2129 if (!ISSET(tp->t_state, TS_ERASE)) {
2130 SET(tp->t_state, TS_ERASE);
2131 (void)ttyoutput('\\', tp);
2135 ttyecho(tp->t_cc[VERASE], tp);
2137 * This code may be executed not only when an ERASE key
2138 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2139 * So, I didn't think it was worthwhile to pass the extra
2140 * information (which would need an extra parameter,
2141 * changing every call) needed to distinguish the ERASE2
2142 * case from the ERASE.
2149 * Back over cnt characters, erasing them.
2158 (void)ttyoutput('\b', tp);
2159 (void)ttyoutput(' ', tp);
2160 (void)ttyoutput('\b', tp);
2166 * Reprint the rawq line. Note, it is assumed that c_cc has already
2176 /* Echo the reprint character. */
2177 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2178 ttyecho(tp->t_cc[VREPRINT], tp);
2180 (void)ttyoutput('\n', tp);
2184 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2185 * BIT OF FIRST CHAR.
2188 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2189 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2191 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2192 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2194 CLR(tp->t_state, TS_ERASE);
2197 tp->t_rocount = tp->t_rawq.c_cc;
2202 * Echo a typed character to the terminal.
2210 if (!ISSET(tp->t_state, TS_CNTTB))
2211 CLR(tp->t_lflag, FLUSHO);
2212 if ((!ISSET(tp->t_lflag, ECHO) &&
2213 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2214 ISSET(tp->t_lflag, EXTPROC))
2216 if (ISSET(tp->t_lflag, ECHOCTL) &&
2217 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2218 ISSET(c, TTY_CHARMASK) == 0177)) {
2219 (void)ttyoutput('^', tp);
2220 CLR(c, ~TTY_CHARMASK);
2226 (void)ttyoutput(c, tp);
2230 * Wake up any readers on a tty.
2237 if (tp->t_rsel.si_pid != 0)
2238 selwakeup(&tp->t_rsel);
2239 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2240 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2241 wakeup(TSA_HUP_OR_INPUT(tp));
2242 KNOTE(&tp->t_rsel.si_note, 0);
2246 * Wake up any writers on a tty.
2253 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2254 selwakeup(&tp->t_wsel);
2255 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2256 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2257 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2258 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2259 CLR(tp->t_state, TS_SO_OCOMPLETE);
2260 wakeup(TSA_OCOMPLETE(tp));
2262 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2263 tp->t_outq.c_cc <= tp->t_olowat) {
2264 CLR(tp->t_state, TS_SO_OLOWAT);
2265 wakeup(TSA_OLOWAT(tp));
2267 KNOTE(&tp->t_wsel.si_note, 0);
2271 * Look up a code for a specified speed in a conversion table;
2272 * used by drivers to map software speed values to hardware parameters.
2275 ttspeedtab(speed, table)
2277 struct speedtab *table;
2280 for ( ; table->sp_speed != -1; table++)
2281 if (table->sp_speed == speed)
2282 return (table->sp_code);
2287 * Set input and output watermarks and buffer sizes. For input, the
2288 * high watermark is about one second's worth of input above empty, the
2289 * low watermark is slightly below high water, and the buffer size is a
2290 * driver-dependent amount above high water. For output, the watermarks
2291 * are near the ends of the buffer, with about 1 second's worth of input
2292 * between them. All this only applies to the standard line discipline.
2298 int cps, ttmaxhiwat, x;
2301 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2302 switch (tp->t_ispeedwat) {
2304 cps = tp->t_ispeed / 10;
2308 * This case is for old drivers that don't know about
2309 * t_ispeedwat. Arrange for them to get the old buffer
2310 * sizes and watermarks.
2312 cps = TTYHOG - 2 * 256;
2313 tp->t_ififosize = 2 * 256;
2316 cps = tp->t_ispeedwat / 10;
2320 tp->t_ilowat = 7 * cps / 8;
2321 x = cps + tp->t_ififosize;
2322 clist_alloc_cblocks(&tp->t_rawq, x, x);
2325 switch (tp->t_ospeedwat) {
2327 cps = tp->t_ospeed / 10;
2328 ttmaxhiwat = 2 * TTMAXHIWAT;
2331 cps = tp->t_ospeed / 10;
2332 ttmaxhiwat = TTMAXHIWAT;
2335 cps = tp->t_ospeedwat / 10;
2336 ttmaxhiwat = 8 * TTMAXHIWAT;
2339 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2340 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2342 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2343 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2344 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2346 clist_alloc_cblocks(&tp->t_outq, x, x);
2351 * Report on state of foreground process group.
2357 struct proc *p, *pick;
2358 struct timeval utime, stime;
2361 if (ttycheckoutq(tp,0) == 0)
2365 * We always print the load average, then figure out what else to
2366 * print based on the state of the current process group.
2368 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2369 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2371 if (tp->t_session == NULL) {
2372 ttyprintf(tp, "not a controlling terminal\n");
2373 } else if (tp->t_pgrp == NULL) {
2374 ttyprintf(tp, "no foreground process group\n");
2375 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2376 ttyprintf(tp, "empty foreground process group\n");
2379 * Pick an interesting process. Note that certain elements,
2380 * in particular the wmesg, require a critical section for
2381 * safe access (YYY and we are still not MP safe).
2383 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2384 * p_thread->td_comm.
2394 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2395 if (proc_compare(pick, p))
2400 * Figure out what wait/process-state message, and command
2403 if (pick->p_thread == NULL)
2405 else if (pick->p_stat == SRUN)
2407 else if (pick->p_wmesg) /* p_thread must not be NULL */
2408 str = pick->p_wmesg;
2412 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2413 (pick->p_thread ? pick->p_comm : "?"),
2417 * Calculate cpu usage, percent cpu, and cmsz. Note that
2418 * 'pick' becomes invalid the moment we exit the critical
2421 if (pick->p_thread && (pick->p_flag & P_INMEM)) {
2422 calcru(pick, &utime, &stime, NULL);
2428 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2430 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2433 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2440 ttyprintf(tp, " %s ", buf);
2442 ttyprintf(tp, "%ld.%02ldu ",
2443 utime.tv_sec, utime.tv_usec / 10000);
2444 ttyprintf(tp, "%ld.%02lds ",
2445 stime.tv_sec, stime.tv_usec / 10000);
2447 ttyprintf(tp, "?.??u ?.??s ");
2449 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2451 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2455 * Returns 1 if p2 is "better" than p1
2457 * The algorithm for picking the "interesting" process is thus:
2459 * 1) Only foreground processes are eligible - implied.
2460 * 2) Runnable processes are favored over anything else. The runner
2461 * with the highest cpu utilization is picked (p_estcpu). Ties are
2462 * broken by picking the highest pid.
2463 * 3) The sleeper with the shortest sleep time is next. With ties,
2464 * we pick out just "short-term" sleepers (P_SINTR == 0).
2465 * 4) Further ties are broken by picking the highest pid.
2467 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2468 #define TESTAB(a, b) ((a)<<1 | (b))
2474 proc_compare(p1, p2)
2475 struct proc *p1, *p2;
2481 * see if at least one of them is runnable
2483 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2490 * tie - favor one with highest recent cpu utilization
2492 if (p2->p_estcpu > p1->p_estcpu)
2494 if (p1->p_estcpu > p2->p_estcpu)
2496 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2501 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2507 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2510 * pick the one with the smallest sleep time
2512 if (p2->p_slptime > p1->p_slptime)
2514 if (p1->p_slptime > p2->p_slptime)
2517 * favor one sleeping in a non-interruptible sleep
2519 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2521 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2523 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2527 * Output char to tty; console putchar style.
2537 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2542 (void)ttyoutput('\r', tp);
2543 (void)ttyoutput(c, tp);
2550 * Sleep on chan, returning ERESTART if tty changed while we napped and
2551 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2552 * the tty is revoked, restarting a pending call will redo validation done
2553 * at the start of the call.
2556 ttysleep(tp, chan, slpflags, wmesg, timo)
2566 error = tsleep(chan, slpflags, wmesg, timo);
2569 return (tp->t_gen == gen ? 0 : ERESTART);
2573 * Allocate a tty struct. Clists in the struct will be allocated by
2583 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2590 * Free a tty struct. Clists in the struct should have been freed by
2593 * XXX not yet usable: since we support a half-closed state and do not
2594 * ref count the tty reference from the session, it is possible for a
2595 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2609 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2613 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2617 SLIST_FOREACH(tp, &tty_list, t_list) {
2620 t.t_dev = (dev_t)dev2udev(t.t_dev);
2621 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2628 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2629 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2641 ttyread(dev, uio, flag)
2651 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2655 ttywrite(dev, uio, flag)
2665 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));