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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14 * notice, this list of conditions and the following disclaimer.
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18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
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33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $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 1.36 2007/02/03 17:05:58 corecode 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.
218 ttyopen(cdev_t device, struct tty *tp)
222 if (!ISSET(tp->t_state, TS_ISOPEN)) {
223 SET(tp->t_state, TS_ISOPEN);
224 if (ISSET(tp->t_cflag, CLOCAL))
225 SET(tp->t_state, TS_CONNECTED);
226 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
234 * Handle close() on a tty line: flush and set to initial state,
235 * bumping generation number so that pending read/write calls
236 * can detect recycling of the tty.
238 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
239 * and l_close() should have flushed, but we repeat the spltty() and
240 * the flush in case there are buggy callers.
243 ttyclose(struct tty *tp)
245 funsetown(tp->t_sigio);
250 ttyflush(tp, FREAD | FWRITE);
251 clist_free_cblocks(&tp->t_canq);
252 clist_free_cblocks(&tp->t_outq);
253 clist_free_cblocks(&tp->t_rawq);
256 tp->t_line = TTYDISC;
264 * Disassociate the tty from its session. Traditionally this has only been
265 * a half-close, meaning that the session was still allowed to point at the
266 * tty (resulting in the tty in the ps command showing something like 'p0-'),
267 * even though the tty is no longer pointing at the session.
269 * The half close seems to be useful only for 'ps' output but there is as
270 * yet no reason to remove the feature. The full-close code is currently
271 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
274 ttyclearsession(struct tty *tp)
279 if ((sp = tp->t_session) != NULL) {
280 tp->t_session = NULL;
281 #ifdef TTY_DO_FULL_CLOSE
282 /* FULL CLOSE (not yet) */
283 if (sp->s_ttyp == tp) {
286 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
287 "%p/%p\n", sp->s_ttyp, tp);
294 * Terminate the tty vnode association for a session. This is the
295 * 'other half' of the close. Because multiple opens of /dev/tty
296 * only generate a single open to the actual tty, the file modes
297 * are locked to FREAD|FWRITE.
300 ttyclosesession(struct session *sp, int dorele)
304 if ((vp = sp->s_ttyvp) == NULL)
307 if (vp->v_flag & VCTTYISOPEN) {
308 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY) == 0) {
309 vclrflags(vp, VCTTYISOPEN);
310 VOP_CLOSE(vp, FREAD|FWRITE);
319 #define FLUSHQ(q) { \
321 ndflush(q, (q)->c_cc); \
324 /* Is 'c' a line delimiter ("break" character)? */
325 #define TTBREAKC(c, lflag) \
326 ((c) == '\n' || (((c) == cc[VEOF] || \
327 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
328 (c) != _POSIX_VDISABLE))
331 * Process input of a single character received on a tty.
334 ttyinput(int c, struct tty *tp)
336 tcflag_t iflag, lflag;
341 * If input is pending take it first.
344 if (ISSET(lflag, PENDIN))
349 if (ISSET(lflag, ICANON))
356 * Block further input iff:
357 * current input > threshold AND input is available to user program
358 * AND input flow control is enabled and not yet invoked.
359 * The 3 is slop for PARMRK.
362 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
363 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
364 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
365 !ISSET(tp->t_state, TS_TBLOCK))
368 /* Handle exceptional conditions (break, parity, framing). */
370 err = (ISSET(c, TTY_ERRORMASK));
372 CLR(c, TTY_ERRORMASK);
373 if (ISSET(err, TTY_BI)) {
374 if (ISSET(iflag, IGNBRK))
376 if (ISSET(iflag, BRKINT)) {
377 ttyflush(tp, FREAD | FWRITE);
378 pgsignal(tp->t_pgrp, SIGINT, 1);
381 if (ISSET(iflag, PARMRK))
383 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
384 || ISSET(err, TTY_FE)) {
385 if (ISSET(iflag, IGNPAR))
387 else if (ISSET(iflag, PARMRK)) {
389 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
392 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
393 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
394 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
401 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
403 if (!ISSET(lflag, EXTPROC)) {
405 * Check for literal nexting very first
407 if (ISSET(tp->t_state, TS_LNCH)) {
409 CLR(tp->t_state, TS_LNCH);
412 * Scan for special characters. This code
413 * is really just a big case statement with
414 * non-constant cases. The bottom of the
415 * case statement is labeled ``endcase'', so goto
416 * it after a case match, or similar.
420 * Control chars which aren't controlled
421 * by ICANON, ISIG, or IXON.
423 if (ISSET(lflag, IEXTEN)) {
424 if (CCEQ(cc[VLNEXT], c)) {
425 if (ISSET(lflag, ECHO)) {
426 if (ISSET(lflag, ECHOE)) {
427 (void)ttyoutput('^', tp);
428 (void)ttyoutput('\b', tp);
432 SET(tp->t_state, TS_LNCH);
435 if (CCEQ(cc[VDISCARD], c)) {
436 if (ISSET(lflag, FLUSHO))
437 CLR(tp->t_lflag, FLUSHO);
439 ttyflush(tp, FWRITE);
441 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
443 SET(tp->t_lflag, FLUSHO);
451 if (ISSET(lflag, ISIG)) {
452 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
453 if (!ISSET(lflag, NOFLSH))
454 ttyflush(tp, FREAD | FWRITE);
457 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
460 if (CCEQ(cc[VSUSP], c)) {
461 if (!ISSET(lflag, NOFLSH))
464 pgsignal(tp->t_pgrp, SIGTSTP, 1);
469 * Handle start/stop characters.
471 if (ISSET(iflag, IXON)) {
472 if (CCEQ(cc[VSTOP], c)) {
473 if (!ISSET(tp->t_state, TS_TTSTOP)) {
474 SET(tp->t_state, TS_TTSTOP);
475 (*tp->t_stop)(tp, 0);
478 if (!CCEQ(cc[VSTART], c))
481 * if VSTART == VSTOP then toggle
485 if (CCEQ(cc[VSTART], c))
489 * IGNCR, ICRNL, & INLCR
492 if (ISSET(iflag, IGNCR))
494 else if (ISSET(iflag, ICRNL))
496 } else if (c == '\n' && ISSET(iflag, INLCR))
499 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
501 * From here on down canonical mode character
502 * processing takes place.
505 * erase or erase2 (^H / ^?)
507 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
509 ttyrub(clist_unputc(&tp->t_rawq), tp);
515 if (CCEQ(cc[VKILL], c)) {
516 if (ISSET(lflag, ECHOKE) &&
517 tp->t_rawq.c_cc == tp->t_rocount &&
518 !ISSET(lflag, ECHOPRT))
519 while (tp->t_rawq.c_cc)
520 ttyrub(clist_unputc(&tp->t_rawq), tp);
523 if (ISSET(lflag, ECHOK) ||
524 ISSET(lflag, ECHOKE))
529 CLR(tp->t_state, TS_LOCAL);
535 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
541 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
546 * erase last char of word and remember the
547 * next chars type (for ALTWERASE)
550 c = clist_unputc(&tp->t_rawq);
553 if (c == ' ' || c == '\t') {
554 clist_putc(c, &tp->t_rawq);
563 c = clist_unputc(&tp->t_rawq);
566 } while (c != ' ' && c != '\t' &&
567 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
568 clist_putc(c, &tp->t_rawq);
574 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
579 * ^T - kernel info and generate SIGINFO
581 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
582 if (ISSET(lflag, ISIG))
583 pgsignal(tp->t_pgrp, SIGINFO, 1);
584 if (!ISSET(lflag, NOKERNINFO))
588 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
589 if (ISSET(lflag, ISIG))
590 pgsignal(tp->t_pgrp, SIGCKPT, 1);
595 * Check for input buffer overflow
597 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
599 if (ISSET(iflag, IMAXBEL)) {
600 if (tp->t_outq.c_cc < tp->t_ohiwat)
601 (void)ttyoutput(CTRL('g'), tp);
606 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
607 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
608 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
611 * Put data char in q for user and
612 * wakeup on seeing a line delimiter.
614 if (clist_putc(c, &tp->t_rawq) >= 0) {
615 if (!ISSET(lflag, ICANON)) {
620 if (TTBREAKC(c, lflag)) {
622 catq(&tp->t_rawq, &tp->t_canq);
624 } else if (tp->t_rocount++ == 0)
625 tp->t_rocol = tp->t_column;
626 if (ISSET(tp->t_state, TS_ERASE)) {
628 * end of prterase \.../
630 CLR(tp->t_state, TS_ERASE);
631 (void)ttyoutput('/', tp);
635 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
637 * Place the cursor over the '^' of the ^D.
639 i = imin(2, tp->t_column - i);
641 (void)ttyoutput('\b', tp);
648 * IXANY means allow any character to restart output.
650 if (ISSET(tp->t_state, TS_TTSTOP) &&
651 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
654 CLR(tp->t_lflag, FLUSHO);
655 CLR(tp->t_state, TS_TTSTOP);
657 return (ttstart(tp));
661 * Output a single character on a tty, doing output processing
662 * as needed (expanding tabs, newline processing, etc.).
663 * Returns < 0 if succeeds, otherwise returns char to resend.
667 ttyoutput(int c, struct tty *tp)
673 if (!ISSET(oflag, OPOST)) {
674 if (ISSET(tp->t_lflag, FLUSHO))
676 if (clist_putc(c, &tp->t_outq))
683 * Do tab expansion if OXTABS is set. Special case if we external
684 * processing, we don't do the tab expansion because we'll probably
685 * get it wrong. If tab expansion needs to be done, let it happen
688 CLR(c, ~TTY_CHARMASK);
690 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
691 c = 8 - (tp->t_column & 7);
692 if (!ISSET(tp->t_lflag, FLUSHO)) {
693 crit_enter(); /* Don't interrupt tabs. */
694 c -= b_to_q(" ", c, &tp->t_outq);
700 return (c ? -1 : '\t');
702 if (c == CEOT && ISSET(oflag, ONOEOT))
706 * Newline translation: if ONLCR is set,
707 * translate newline into "\r\n".
709 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
712 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
715 /* If OCRNL is set, translate "\r" into "\n". */
716 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
718 /* If ONOCR is set, don't transmit CRs when on column 0. */
719 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
724 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
736 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
746 col = (col + 8) & ~7;
754 * Ioctls for all tty devices. Called after line-discipline specific ioctl
755 * has been called to do discipline-specific functions and/or reject any
756 * of these ioctl commands.
760 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
762 struct thread *td = curthread;
763 struct lwp *lp = td->td_lwp;
764 struct proc *p = td->td_proc;
769 /* If the ioctl involves modification, hang if in the background. */
793 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
803 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
804 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
805 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
806 if (p->p_pgrp->pg_jobc == 0)
808 pgsignal(p->p_pgrp, SIGTTOU, 1);
809 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
817 switch (cmd) { /* Process the ioctl. */
818 case FIOASYNC: /* set/clear async i/o */
821 SET(tp->t_state, TS_ASYNC);
823 CLR(tp->t_state, TS_ASYNC);
826 case FIONREAD: /* get # bytes to read */
828 *(int *)data = ttnread(tp);
834 * Policy -- Don't allow FIOSETOWN on someone else's
837 if (tp->t_session != NULL && !isctty(p, tp))
840 error = fsetown(*(int *)data, &tp->t_sigio);
845 if (tp->t_session != NULL && !isctty(p, tp))
847 *(int *)data = fgetown(tp->t_sigio);
850 case TIOCEXCL: /* set exclusive use of tty */
852 SET(tp->t_state, TS_XCLUDE);
855 case TIOCFLUSH: { /* flush buffers */
856 int flags = *(int *)data;
859 flags = FREAD | FWRITE;
861 flags &= FREAD | FWRITE;
865 case TIOCCONS: /* become virtual console */
867 if (constty && constty != tp &&
868 ISSET(constty->t_state, TS_CONNECTED))
871 if ((error = suser(td)) != 0)
875 } else if (tp == constty)
878 case TIOCDRAIN: /* wait till output drained */
883 case TIOCGETA: { /* get termios struct */
884 struct termios *t = (struct termios *)data;
886 bcopy(&tp->t_termios, t, sizeof(struct termios));
889 case TIOCGETD: /* get line discipline */
890 *(int *)data = tp->t_line;
892 case TIOCGWINSZ: /* get window size */
893 *(struct winsize *)data = tp->t_winsize;
895 case TIOCGPGRP: /* get pgrp of tty */
898 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
901 case TIOCHPCL: /* hang up on last close */
903 SET(tp->t_cflag, HUPCL);
907 case TIOCNXCL: /* reset exclusive use of tty */
909 CLR(tp->t_state, TS_XCLUDE);
912 case TIOCOUTQ: /* output queue size */
913 *(int *)data = tp->t_outq.c_cc;
915 case TIOCSETA: /* set termios struct */
916 case TIOCSETAW: /* drain output, set */
917 case TIOCSETAF: { /* drn out, fls in, set */
918 struct termios *t = (struct termios *)data;
920 if (t->c_ispeed == 0)
921 t->c_ispeed = t->c_ospeed;
922 if (t->c_ispeed == 0)
923 t->c_ispeed = tp->t_ospeed;
924 if (t->c_ispeed == 0)
927 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
933 if (cmd == TIOCSETAF)
936 if (!ISSET(t->c_cflag, CIGNORE)) {
938 * Set device hardware.
940 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
944 if (ISSET(t->c_cflag, CLOCAL) &&
945 !ISSET(tp->t_cflag, CLOCAL)) {
947 * XXX disconnections would be too hard to
948 * get rid of without this kludge. The only
949 * way to get rid of controlling terminals
950 * is to exit from the session leader.
952 CLR(tp->t_state, TS_ZOMBIE);
954 wakeup(TSA_CARR_ON(tp));
958 if ((ISSET(tp->t_state, TS_CARR_ON) ||
959 ISSET(t->c_cflag, CLOCAL)) &&
960 !ISSET(tp->t_state, TS_ZOMBIE))
961 SET(tp->t_state, TS_CONNECTED);
963 CLR(tp->t_state, TS_CONNECTED);
964 tp->t_cflag = t->c_cflag;
965 tp->t_ispeed = t->c_ispeed;
966 if (t->c_ospeed != 0)
967 tp->t_ospeed = t->c_ospeed;
970 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
972 if (ISSET(t->c_lflag, ICANON))
973 SET(tp->t_lflag, PENDIN);
976 * XXX we really shouldn't allow toggling
977 * ICANON while we're in a non-termios line
978 * discipline. Now we have to worry about
979 * panicing for a null queue.
981 if (tp->t_canq.c_cbreserved > 0 &&
982 tp->t_rawq.c_cbreserved > 0) {
983 catq(&tp->t_rawq, &tp->t_canq);
985 * XXX the queue limits may be
986 * different, so the old queue
987 * swapping method no longer works.
989 catq(&tp->t_canq, &tp->t_rawq);
991 CLR(tp->t_lflag, PENDIN);
995 tp->t_iflag = t->c_iflag;
996 tp->t_oflag = t->c_oflag;
998 * Make the EXTPROC bit read only.
1000 if (ISSET(tp->t_lflag, EXTPROC))
1001 SET(t->c_lflag, EXTPROC);
1003 CLR(t->c_lflag, EXTPROC);
1004 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1005 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1006 t->c_cc[VTIME] != tp->t_cc[VTIME])
1008 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1012 case TIOCSETD: { /* set line discipline */
1013 int t = *(int *)data;
1014 cdev_t device = tp->t_dev;
1016 if ((u_int)t >= nlinesw)
1018 if (t != tp->t_line) {
1020 (*linesw[tp->t_line].l_close)(tp, flag);
1021 error = (*linesw[t].l_open)(device, tp);
1023 (void)(*linesw[tp->t_line].l_open)(device, tp);
1032 case TIOCSTART: /* start output, like ^Q */
1034 if (ISSET(tp->t_state, TS_TTSTOP) ||
1035 ISSET(tp->t_lflag, FLUSHO)) {
1036 CLR(tp->t_lflag, FLUSHO);
1037 CLR(tp->t_state, TS_TTSTOP);
1042 case TIOCSTI: /* simulate terminal input */
1043 if ((flag & FREAD) == 0 && suser(td))
1045 if (!isctty(p, tp) && suser(td))
1048 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1051 case TIOCSTOP: /* stop output, like ^S */
1053 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1054 SET(tp->t_state, TS_TTSTOP);
1055 (*tp->t_stop)(tp, 0);
1059 case TIOCSCTTY: /* become controlling tty */
1060 /* Session ctty vnode pointer set in vnode layer. */
1061 if (!SESS_LEADER(p) ||
1062 ((p->p_session->s_ttyvp || tp->t_session) &&
1063 (tp->t_session != p->p_session)))
1065 tp->t_session = p->p_session;
1066 tp->t_pgrp = p->p_pgrp;
1067 p->p_session->s_ttyp = tp;
1068 p->p_flag |= P_CONTROLT;
1070 case TIOCSPGRP: { /* set pgrp of tty */
1071 struct pgrp *pgrp = pgfind(*(int *)data);
1075 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1080 case TIOCSTAT: /* simulate control-T */
1085 case TIOCSWINSZ: /* set window size */
1086 if (bcmp((caddr_t)&tp->t_winsize, data,
1087 sizeof (struct winsize))) {
1088 tp->t_winsize = *(struct winsize *)data;
1089 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1092 case TIOCSDRAINWAIT:
1096 tp->t_timeout = *(int *)data * hz;
1097 wakeup(TSA_OCOMPLETE(tp));
1098 wakeup(TSA_OLOWAT(tp));
1100 case TIOCGDRAINWAIT:
1101 *(int *)data = tp->t_timeout / hz;
1104 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1105 return (ttcompat(tp, cmd, data, flag));
1114 ttypoll(struct dev_poll_args *ap)
1116 cdev_t dev = ap->a_head.a_dev;
1117 int events = ap->a_events;
1122 /* XXX used to return ENXIO, but that means true! */
1124 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1125 POLLWRNORM)) | POLLHUP;
1130 if (events & (POLLIN | POLLRDNORM)) {
1131 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1132 revents |= events & (POLLIN | POLLRDNORM);
1134 selrecord(curthread, &tp->t_rsel);
1136 if (events & (POLLOUT | POLLWRNORM)) {
1137 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1138 ISSET(tp->t_state, TS_CONNECTED))
1139 || ISSET(tp->t_state, TS_ZOMBIE))
1140 revents |= events & (POLLOUT | POLLWRNORM);
1142 selrecord(curthread, &tp->t_wsel);
1145 ap->a_events = revents;
1149 static struct filterops ttyread_filtops =
1150 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1151 static struct filterops ttywrite_filtops =
1152 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1155 ttykqfilter(struct dev_kqfilter_args *ap)
1157 cdev_t dev = ap->a_head.a_dev;
1158 struct knote *kn = ap->a_kn;
1159 struct tty *tp = dev->si_tty;
1160 struct klist *klist;
1163 switch (kn->kn_filter) {
1165 klist = &tp->t_rsel.si_note;
1166 kn->kn_fop = &ttyread_filtops;
1169 klist = &tp->t_wsel.si_note;
1170 kn->kn_fop = &ttywrite_filtops;
1177 kn->kn_hook = (caddr_t)dev;
1180 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1187 filt_ttyrdetach(struct knote *kn)
1189 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1192 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1197 filt_ttyread(struct knote *kn, long hint)
1199 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1201 kn->kn_data = ttnread(tp);
1202 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1203 kn->kn_flags |= EV_EOF;
1206 return (kn->kn_data > 0);
1210 filt_ttywdetach(struct knote *kn)
1212 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1215 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1220 filt_ttywrite(struct knote *kn, long hint)
1222 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1224 kn->kn_data = tp->t_outq.c_cc;
1225 if (ISSET(tp->t_state, TS_ZOMBIE))
1227 return (kn->kn_data <= tp->t_olowat &&
1228 ISSET(tp->t_state, TS_CONNECTED));
1232 * Must be called while in a critical section.
1235 ttnread(struct tty *tp)
1239 if (ISSET(tp->t_lflag, PENDIN))
1241 nread = tp->t_canq.c_cc;
1242 if (!ISSET(tp->t_lflag, ICANON)) {
1243 nread += tp->t_rawq.c_cc;
1244 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1251 * Wait for output to drain.
1254 ttywait(struct tty *tp)
1260 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1261 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1263 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1264 ISSET(tp->t_state, TS_CONNECTED)) {
1265 SET(tp->t_state, TS_SO_OCOMPLETE);
1266 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1270 if (error == EWOULDBLOCK)
1277 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1284 * Flush if successfully wait.
1287 ttywflush(struct tty *tp)
1291 if ((error = ttywait(tp)) == 0)
1292 ttyflush(tp, FREAD);
1297 * Flush tty read and/or write queues, notifying anyone waiting.
1300 ttyflush(struct tty *tp, int rw)
1307 FLUSHQ(&tp->t_outq);
1308 CLR(tp->t_state, TS_TTSTOP);
1310 (*tp->t_stop)(tp, rw);
1312 FLUSHQ(&tp->t_canq);
1313 FLUSHQ(&tp->t_rawq);
1314 CLR(tp->t_lflag, PENDIN);
1317 CLR(tp->t_state, TS_LOCAL);
1319 if (ISSET(tp->t_state, TS_TBLOCK)) {
1321 FLUSHQ(&tp->t_outq);
1325 * Don't let leave any state that might clobber the
1326 * next line discipline (although we should do more
1327 * to send the START char). Not clearing the state
1328 * may have caused the "putc to a clist with no
1329 * reserved cblocks" panic/kprintf.
1331 CLR(tp->t_state, TS_TBLOCK);
1333 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1334 if (ISSET(tp->t_iflag, IXOFF)) {
1336 * XXX wait a bit in the hope that the stop
1337 * character (if any) will go out. Waiting
1338 * isn't good since it allows races. This
1339 * will be fixed when the stop character is
1340 * put in a special queue. Don't bother with
1341 * the checks in ttywait() since the timeout
1344 SET(tp->t_state, TS_SO_OCOMPLETE);
1345 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1348 * Don't try sending the stop character again.
1350 CLR(tp->t_state, TS_TBLOCK);
1357 FLUSHQ(&tp->t_outq);
1364 * Copy in the default termios characters.
1367 termioschars(struct termios *t)
1370 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1377 ttychars(struct tty *tp)
1380 termioschars(&tp->t_termios);
1384 * Handle input high water. Send stop character for the IXOFF case. Turn
1385 * on our input flow control bit and propagate the changes to the driver.
1386 * XXX the stop character should be put in a special high priority queue.
1389 ttyblock(struct tty *tp)
1392 SET(tp->t_state, TS_TBLOCK);
1393 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1394 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1395 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1400 * Handle input low water. Send start character for the IXOFF case. Turn
1401 * off our input flow control bit and propagate the changes to the driver.
1402 * XXX the start character should be put in a special high priority queue.
1405 ttyunblock(struct tty *tp)
1408 CLR(tp->t_state, TS_TBLOCK);
1409 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1410 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1411 SET(tp->t_state, TS_TBLOCK); /* try again later */
1416 /* Not used by any current (i386) drivers. */
1418 * Restart after an inter-char delay.
1421 ttrstrt(void *tp_arg)
1425 KASSERT(tp_arg != NULL, ("ttrstrt"));
1429 CLR(tp->t_state, TS_TIMEOUT);
1436 ttstart(struct tty *tp)
1439 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1445 * "close" a line discipline
1448 ttylclose(struct tty *tp, int flag)
1451 if (flag & FNONBLOCK || ttywflush(tp))
1452 ttyflush(tp, FREAD | FWRITE);
1457 * Handle modem control transition on a tty.
1458 * Flag indicates new state of carrier.
1459 * Returns 0 if the line should be turned off, otherwise 1.
1462 ttymodem(struct tty *tp, int flag)
1465 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1467 * MDMBUF: do flow control according to carrier flag
1468 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1469 * works if IXON and IXANY are clear.
1472 CLR(tp->t_state, TS_CAR_OFLOW);
1473 CLR(tp->t_state, TS_TTSTOP);
1475 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1476 SET(tp->t_state, TS_CAR_OFLOW);
1477 SET(tp->t_state, TS_TTSTOP);
1478 (*tp->t_stop)(tp, 0);
1480 } else if (flag == 0) {
1484 CLR(tp->t_state, TS_CARR_ON);
1485 if (ISSET(tp->t_state, TS_ISOPEN) &&
1486 !ISSET(tp->t_cflag, CLOCAL)) {
1487 SET(tp->t_state, TS_ZOMBIE);
1488 CLR(tp->t_state, TS_CONNECTED);
1489 if (tp->t_session && tp->t_session->s_leader)
1490 ksignal(tp->t_session->s_leader, SIGHUP);
1491 ttyflush(tp, FREAD | FWRITE);
1498 SET(tp->t_state, TS_CARR_ON);
1499 if (!ISSET(tp->t_state, TS_ZOMBIE))
1500 SET(tp->t_state, TS_CONNECTED);
1501 wakeup(TSA_CARR_ON(tp));
1509 * Reinput pending characters after state switch
1510 * call from a critical section.
1513 ttypend(struct tty *tp)
1518 CLR(tp->t_lflag, PENDIN);
1519 SET(tp->t_state, TS_TYPEN);
1521 * XXX this assumes too much about clist internals. It may even
1522 * fail if the cblock slush pool is empty. We can't allocate more
1523 * cblocks here because we are called from an interrupt handler
1524 * and clist_alloc_cblocks() can wait.
1527 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1528 tp->t_rawq.c_cbmax = tq.c_cbmax;
1529 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1530 while ((c = clist_getc(&tq)) >= 0)
1532 CLR(tp->t_state, TS_TYPEN);
1536 * Process a read call on a tty device.
1539 ttread(struct tty *tp, struct uio *uio, int flag)
1544 cc_t *cc = tp->t_cc;
1547 int first, error = 0;
1548 int has_stime = 0, last_cc = 0;
1549 long slp = 0; /* XXX this should be renamed `timo'. */
1550 struct timeval stime;
1552 lp = curthread->td_lwp;
1556 lflag = tp->t_lflag;
1558 * take pending input first
1560 if (ISSET(lflag, PENDIN)) {
1562 splz(); /* reduce latency */
1563 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1567 * Hang process if it's in the background.
1569 if ((pp = curproc) && isbackground(pp, tp)) {
1571 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1572 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1573 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1575 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1576 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1582 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1584 return (0); /* EOF */
1588 * If canonical, use the canonical queue,
1589 * else use the raw queue.
1591 * (should get rid of clists...)
1593 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1595 if (flag & IO_NDELAY) {
1598 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1603 return (EWOULDBLOCK);
1605 if (!ISSET(lflag, ICANON)) {
1608 struct timeval timecopy;
1611 * Check each of the four combinations.
1612 * (m > 0 && t == 0) is the normal read case.
1613 * It should be fairly efficient, so we check that and its
1614 * companion case (m == 0 && t == 0) first.
1615 * For the other two cases, we compute the target sleep time
1624 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1628 t *= 100000; /* time in us */
1629 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1630 ((t1).tv_usec - (t2).tv_usec))
1636 getmicrotime(&timecopy);
1638 /* first character, start timer */
1642 } else if (qp->c_cc > last_cc) {
1643 /* got a character, restart timer */
1647 /* nothing, check expiration */
1648 slp = t - diff(timecopy, stime);
1653 } else { /* m == 0 */
1656 getmicrotime(&timecopy);
1662 slp = t - diff(timecopy, stime);
1664 /* Timed out, but 0 is enough input. */
1672 * Rounding down may make us wake up just short
1673 * of the target, so we round up.
1674 * The formula is ceiling(slp * hz/1000000).
1675 * 32-bit arithmetic is enough for hz < 169.
1676 * XXX see tvtohz() for how to avoid overflow if hz
1677 * is large (divide by `tick' and/or arrange to
1678 * use tvtohz() if hz is large).
1680 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1683 if (qp->c_cc <= 0) {
1686 * There is no input, or not enough input and we can block.
1688 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1689 ISSET(tp->t_state, TS_CONNECTED) ?
1690 "ttyin" : "ttyhup", (int)slp);
1692 if (error == EWOULDBLOCK)
1697 * XXX what happens if another process eats some input
1698 * while we are asleep (not just here)? It would be
1699 * safest to detect changes and reset our state variables
1700 * (has_stime and last_cc).
1708 * Input present, check for input mapping and processing.
1711 if (ISSET(lflag, ICANON | ISIG))
1717 icc = imin(uio->uio_resid, IBUFSIZ);
1718 icc = q_to_b(qp, ibuf, icc);
1724 error = uiomove(ibuf, icc, uio);
1726 * XXX if there was an error then we should ungetc() the
1727 * unmoved chars and reduce icc here.
1731 if (uio->uio_resid == 0)
1745 * delayed suspend (^Y)
1747 if (CCEQ(cc[VDSUSP], c) &&
1748 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1749 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1751 error = ttysleep(tp, &lbolt, PCATCH,
1760 * Interpret EOF only in canonical mode.
1762 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1765 * Give user character.
1767 error = ureadc(c, uio);
1769 /* XXX should ungetc(c, qp). */
1771 if (uio->uio_resid == 0)
1774 * In canonical mode check for a "break character"
1775 * marking the end of a "line of input".
1777 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1784 * Look to unblock input now that (presumably)
1785 * the input queue has gone down.
1788 if (ISSET(tp->t_state, TS_TBLOCK) &&
1789 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1797 * Check the output queue on tp for space for a kernel message (from uprintf
1798 * or tprintf). Allow some space over the normal hiwater mark so we don't
1799 * lose messages due to normal flow control, but don't let the tty run amok.
1800 * Sleeps here are not interruptible, but we return prematurely if new signals
1804 ttycheckoutq(struct tty *tp, int wait)
1809 hiwat = tp->t_ohiwat;
1810 SIGEMPTYSET(oldmask);
1813 oldmask = curproc->p_siglist;
1814 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1815 while (tp->t_outq.c_cc > hiwat) {
1817 if (tp->t_outq.c_cc <= hiwat)
1819 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1823 SET(tp->t_state, TS_SO_OLOWAT);
1824 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1832 * Process a write call on a tty device.
1835 ttwrite(struct tty *tp, struct uio *uio, int flag)
1841 int i, hiwat, cnt, error;
1844 lp = curthread->td_lwp;
1845 hiwat = tp->t_ohiwat;
1846 cnt = uio->uio_resid;
1851 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1853 if (uio->uio_resid == cnt)
1857 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1858 if (flag & IO_NDELAY) {
1860 error = EWOULDBLOCK;
1863 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1872 * Hang the process if it's in the background.
1874 if ((pp = curproc) && isbackground(pp, tp) &&
1875 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1876 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1877 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1878 if (pp->p_pgrp->pg_jobc == 0) {
1882 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1883 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1889 * Process the user's data in at most OBUFSIZ chunks. Perform any
1890 * output translation. Keep track of high water mark, sleep on
1891 * overflow awaiting device aid in acquiring new space.
1893 while (uio->uio_resid > 0 || cc > 0) {
1894 if (ISSET(tp->t_lflag, FLUSHO)) {
1898 if (tp->t_outq.c_cc > hiwat)
1901 * Grab a hunk of data from the user, unless we have some
1902 * leftover from last time.
1905 cc = imin(uio->uio_resid, OBUFSIZ);
1907 error = uiomove(cp, cc, uio);
1914 * If nothing fancy need be done, grab those characters we
1915 * can handle without any of ttyoutput's processing and
1916 * just transfer them to the output q. For those chars
1917 * which require special processing (as indicated by the
1918 * bits in char_type), call ttyoutput. After processing
1919 * a hunk of data, look for FLUSHO so ^O's will take effect
1923 if (!ISSET(tp->t_oflag, OPOST))
1926 ce = cc - scanc((u_int)cc, (u_char *)cp,
1927 char_type, CCLASSMASK);
1929 * If ce is zero, then we're processing
1930 * a special character through ttyoutput.
1934 if (ttyoutput(*cp, tp) >= 0) {
1935 /* No Clists, wait a bit. */
1937 if (flag & IO_NDELAY) {
1938 error = EWOULDBLOCK;
1941 error = ttysleep(tp, &lbolt,
1950 if (ISSET(tp->t_lflag, FLUSHO) ||
1951 tp->t_outq.c_cc > hiwat)
1957 * A bunch of normal characters have been found.
1958 * Transfer them en masse to the output queue and
1959 * continue processing at the top of the loop.
1960 * If there are any further characters in this
1961 * <= OBUFSIZ chunk, the first should be a character
1962 * requiring special handling by ttyoutput.
1965 i = b_to_q(cp, ce, &tp->t_outq);
1968 cp += ce, cc -= ce, tk_nout += ce;
1971 /* No Clists, wait a bit. */
1973 if (flag & IO_NDELAY) {
1974 error = EWOULDBLOCK;
1977 error = ttysleep(tp, &lbolt, PCATCH,
1983 if (ISSET(tp->t_lflag, FLUSHO) ||
1984 tp->t_outq.c_cc > hiwat)
1991 * If cc is nonzero, we leave the uio structure inconsistent, as the
1992 * offset and iov pointers have moved forward, but it doesn't matter
1993 * (the call will either return short or restart with a new uio).
1995 uio->uio_resid += cc;
2002 * This can only occur if FLUSHO is set in t_lflag,
2003 * or if ttstart/oproc is synchronous (or very fast).
2005 if (tp->t_outq.c_cc <= hiwat) {
2009 if (flag & IO_NDELAY) {
2011 uio->uio_resid += cc;
2012 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2014 SET(tp->t_state, TS_SO_OLOWAT);
2015 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2017 if (error == EWOULDBLOCK)
2025 * Rubout one character from the rawq of tp
2026 * as cleanly as possible.
2029 ttyrub(int c, struct tty *tp)
2035 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2037 CLR(tp->t_lflag, FLUSHO);
2038 if (ISSET(tp->t_lflag, ECHOE)) {
2039 if (tp->t_rocount == 0) {
2041 * Screwed by ttwrite; retype
2046 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2049 CLR(c, ~TTY_CHARMASK);
2050 switch (CCLASS(c)) {
2059 if (ISSET(tp->t_lflag, ECHOCTL))
2063 if (tp->t_rocount < tp->t_rawq.c_cc) {
2068 savecol = tp->t_column;
2069 SET(tp->t_state, TS_CNTTB);
2070 SET(tp->t_lflag, FLUSHO);
2071 tp->t_column = tp->t_rocol;
2072 cp = tp->t_rawq.c_cf;
2074 tabc = *cp; /* XXX FIX NEXTC */
2075 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2077 CLR(tp->t_lflag, FLUSHO);
2078 CLR(tp->t_state, TS_CNTTB);
2081 /* savecol will now be length of the tab. */
2082 savecol -= tp->t_column;
2083 tp->t_column += savecol;
2085 savecol = 8; /* overflow screw */
2086 while (--savecol >= 0)
2087 (void)ttyoutput('\b', tp);
2090 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2091 (void)kprintf(PANICSTR, c, CCLASS(c));
2093 panic(PANICSTR, c, CCLASS(c));
2097 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2098 if (!ISSET(tp->t_state, TS_ERASE)) {
2099 SET(tp->t_state, TS_ERASE);
2100 (void)ttyoutput('\\', tp);
2104 ttyecho(tp->t_cc[VERASE], tp);
2106 * This code may be executed not only when an ERASE key
2107 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2108 * So, I didn't think it was worthwhile to pass the extra
2109 * information (which would need an extra parameter,
2110 * changing every call) needed to distinguish the ERASE2
2111 * case from the ERASE.
2118 * Back over cnt characters, erasing them.
2121 ttyrubo(struct tty *tp, int cnt)
2125 (void)ttyoutput('\b', tp);
2126 (void)ttyoutput(' ', tp);
2127 (void)ttyoutput('\b', tp);
2133 * Reprint the rawq line. Note, it is assumed that c_cc has already
2137 ttyretype(struct tty *tp)
2142 /* Echo the reprint character. */
2143 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2144 ttyecho(tp->t_cc[VREPRINT], tp);
2146 (void)ttyoutput('\n', tp);
2150 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2151 * BIT OF FIRST CHAR.
2154 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2155 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2157 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2158 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2160 CLR(tp->t_state, TS_ERASE);
2163 tp->t_rocount = tp->t_rawq.c_cc;
2168 * Echo a typed character to the terminal.
2171 ttyecho(int c, struct tty *tp)
2174 if (!ISSET(tp->t_state, TS_CNTTB))
2175 CLR(tp->t_lflag, FLUSHO);
2176 if ((!ISSET(tp->t_lflag, ECHO) &&
2177 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2178 ISSET(tp->t_lflag, EXTPROC))
2180 if (ISSET(tp->t_lflag, ECHOCTL) &&
2181 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2182 ISSET(c, TTY_CHARMASK) == 0177)) {
2183 (void)ttyoutput('^', tp);
2184 CLR(c, ~TTY_CHARMASK);
2190 (void)ttyoutput(c, tp);
2194 * Wake up any readers on a tty.
2197 ttwakeup(struct tty *tp)
2200 if (tp->t_rsel.si_pid != 0)
2201 selwakeup(&tp->t_rsel);
2202 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2203 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2204 wakeup(TSA_HUP_OR_INPUT(tp));
2205 KNOTE(&tp->t_rsel.si_note, 0);
2209 * Wake up any writers on a tty.
2212 ttwwakeup(struct tty *tp)
2215 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2216 selwakeup(&tp->t_wsel);
2217 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2218 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2219 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2220 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2221 CLR(tp->t_state, TS_SO_OCOMPLETE);
2222 wakeup(TSA_OCOMPLETE(tp));
2224 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2225 tp->t_outq.c_cc <= tp->t_olowat) {
2226 CLR(tp->t_state, TS_SO_OLOWAT);
2227 wakeup(TSA_OLOWAT(tp));
2229 KNOTE(&tp->t_wsel.si_note, 0);
2233 * Look up a code for a specified speed in a conversion table;
2234 * used by drivers to map software speed values to hardware parameters.
2237 ttspeedtab(int speed, struct speedtab *table)
2240 for ( ; table->sp_speed != -1; table++)
2241 if (table->sp_speed == speed)
2242 return (table->sp_code);
2247 * Set input and output watermarks and buffer sizes. For input, the
2248 * high watermark is about one second's worth of input above empty, the
2249 * low watermark is slightly below high water, and the buffer size is a
2250 * driver-dependent amount above high water. For output, the watermarks
2251 * are near the ends of the buffer, with about 1 second's worth of input
2252 * between them. All this only applies to the standard line discipline.
2255 ttsetwater(struct tty *tp)
2257 int cps, ttmaxhiwat, x;
2260 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2261 switch (tp->t_ispeedwat) {
2263 cps = tp->t_ispeed / 10;
2267 * This case is for old drivers that don't know about
2268 * t_ispeedwat. Arrange for them to get the old buffer
2269 * sizes and watermarks.
2271 cps = TTYHOG - 2 * 256;
2272 tp->t_ififosize = 2 * 256;
2275 cps = tp->t_ispeedwat / 10;
2279 tp->t_ilowat = 7 * cps / 8;
2280 x = cps + tp->t_ififosize;
2281 clist_alloc_cblocks(&tp->t_rawq, x, x);
2284 switch (tp->t_ospeedwat) {
2286 cps = tp->t_ospeed / 10;
2287 ttmaxhiwat = 2 * TTMAXHIWAT;
2290 cps = tp->t_ospeed / 10;
2291 ttmaxhiwat = TTMAXHIWAT;
2294 cps = tp->t_ospeedwat / 10;
2295 ttmaxhiwat = 8 * TTMAXHIWAT;
2298 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2299 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2301 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2302 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2303 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2305 clist_alloc_cblocks(&tp->t_outq, x, x);
2310 * Report on state of foreground process group.
2313 ttyinfo(struct tty *tp)
2315 struct proc *p, *pick;
2320 if (ttycheckoutq(tp,0) == 0)
2324 * We always print the load average, then figure out what else to
2325 * print based on the state of the current process group.
2327 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2328 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2330 if (tp->t_session == NULL) {
2331 ttyprintf(tp, "not a controlling terminal\n");
2332 } else if (tp->t_pgrp == NULL) {
2333 ttyprintf(tp, "no foreground process group\n");
2334 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2335 ttyprintf(tp, "empty foreground process group\n");
2338 * Pick an interesting process. Note that certain elements,
2339 * in particular the wmesg, require a critical section for
2340 * safe access (YYY and we are still not MP safe).
2342 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2352 /* XXX lwp should compare lwps */
2354 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2355 if (proc_compare(pick, p))
2360 lp = FIRST_LWP_IN_PROC(pick);
2362 ttyprintf(tp, "foreground process without lwp\n");
2368 * Figure out what wait/process-state message, and command
2372 * XXX lwp This is a horrible mixture. We need to rework this
2373 * as soon as lwps have their own runnable status.
2375 if (pick->p_flag & P_WEXIT)
2377 else if (pick->p_stat == SRUN)
2379 else if (pick->p_stat == SIDL)
2381 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2382 str = lp->lwp_wmesg;
2386 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2387 pick->p_comm, pick->p_pid, str);
2390 * Calculate cpu usage, percent cpu, and cmsz. Note that
2391 * 'pick' becomes invalid the moment we exit the critical
2394 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) {
2395 calcru_proc(pick, &ru);
2401 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2403 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE))
2406 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2413 ttyprintf(tp, " %s ", buf);
2414 ttyprintf(tp, "%ld.%02ldu ",
2415 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2416 ttyprintf(tp, "%ld.%02lds ",
2417 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2418 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2420 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2424 * Returns 1 if p2 is "better" than p1
2426 * The algorithm for picking the "interesting" process is thus:
2428 * 1) Only foreground processes are eligible - implied.
2429 * 2) Runnable processes are favored over anything else. The runner
2430 * with the highest cpu utilization is picked (p_cpticks). Ties are
2431 * broken by picking the highest pid.
2432 * 3) The sleeper with the shortest sleep time is next. With ties,
2433 * we pick out just "short-term" sleepers (P_SINTR == 0).
2434 * 4) Further ties are broken by picking the highest pid.
2436 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2437 #define TESTAB(a, b) ((a)<<1 | (b))
2443 proc_compare(struct proc *p1, struct proc *p2)
2445 struct lwp *lp1, *lp2;
2450 lp1 = FIRST_LWP_IN_PROC(p1);
2451 lp2 = FIRST_LWP_IN_PROC(p2);
2454 * see if at least one of them is runnable
2456 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2463 * tie - favor one with highest recent cpu utilization
2465 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2467 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2469 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2474 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) {
2480 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2483 * pick the one with the smallest sleep time
2485 if (lp2->lwp_slptime > lp1->lwp_slptime)
2487 if (lp1->lwp_slptime > lp2->lwp_slptime)
2490 * favor one sleeping in a non-interruptible sleep
2492 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2494 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2496 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2500 * Output char to tty; console putchar style.
2503 tputchar(int c, struct tty *tp)
2506 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2511 (void)ttyoutput('\r', tp);
2512 (void)ttyoutput(c, tp);
2519 * Sleep on chan, returning ERESTART if tty changed while we napped and
2520 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2521 * the tty is revoked, restarting a pending call will redo validation done
2522 * at the start of the call.
2525 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2531 error = tsleep(chan, slpflags, wmesg, timo);
2534 return (tp->t_gen == gen ? 0 : ERESTART);
2538 * Allocate a tty struct. Clists in the struct will be allocated by
2542 ttymalloc(struct tty *tp)
2547 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2554 * Free a tty struct. Clists in the struct should have been freed by
2557 * XXX not yet usable: since we support a half-closed state and do not
2558 * ref count the tty reference from the session, it is possible for a
2559 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2562 ttyfree(struct tty *tp)
2569 ttyregister(struct tty *tp)
2571 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2575 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2579 SLIST_FOREACH(tp, &tty_list, t_list) {
2582 t.t_dev = (cdev_t)dev2udev(t.t_dev);
2583 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2590 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2591 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2594 nottystop(struct tty *tp, int rw)
2601 ttyread(struct dev_read_args *ap)
2605 tp = ap->a_head.a_dev->si_tty;
2608 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2612 ttywrite(struct dev_write_args *ap)
2616 tp = ap->a_head.a_dev->si_tty;
2619 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));