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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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20 * This product includes software developed by the University of
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34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $Id: tty.c,v 1.105 1998/07/11 10:41:15 bde Exp $
44 * o Fix races for sending the start char in ttyflush().
45 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
46 * With luck, there will be MIN chars before select() returns().
47 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
48 * o Don't allow input in TS_ZOMBIE case. It would be visible through
50 * o Do the new sio locking stuff here and use it to avoid special
53 * o Move EXTPROC and/or PENDIN to t_state?
54 * o Wrap most of ttioctl in spltty/splx.
55 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
56 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
57 * o Don't allow certain termios flags to affect disciplines other
58 * than TTYDISC. Cancel their effects before switch disciplines
59 * and ignore them if they are set while we are in another
61 * o Handle c_ispeed = 0 to c_ispeed = c_ospeed conversion here instead
62 * of in drivers and fix drivers that write to tp->t_termios.
63 * o Check for TS_CARR_ON being set while everything is closed and not
64 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
65 * so it would live until the next open even if carrier drops.
66 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
67 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
84 #include <sys/fcntl.h>
86 #include <sys/dkstat.h>
88 #include <sys/kernel.h>
89 #include <sys/vnode.h>
90 #include <sys/signalvar.h>
91 #include <sys/resourcevar.h>
92 #include <sys/malloc.h>
94 #include <sys/snoop.h>
100 #include <vm/vm_map.h>
102 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
104 static int proc_compare __P((struct proc *p1, struct proc *p2));
105 static int ttnread __P((struct tty *tp));
106 static void ttyecho __P((int c, struct tty *tp));
107 static int ttyoutput __P((int c, register struct tty *tp));
108 static void ttypend __P((struct tty *tp));
109 static void ttyretype __P((struct tty *tp));
110 static void ttyrub __P((int c, struct tty *tp));
111 static void ttyrubo __P((struct tty *tp, int cnt));
112 static void ttyunblock __P((struct tty *tp));
113 static int ttywflush __P((struct tty *tp));
116 * Table with character classes and parity. The 8th bit indicates parity,
117 * the 7th bit indicates the character is an alphameric or underscore (for
118 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
119 * are 0 then the character needs no special processing on output; classes
120 * other than 0 might be translated or (not currently) require delays.
122 #define E 0x00 /* Even parity. */
123 #define O 0x80 /* Odd parity. */
124 #define PARITY(c) (char_type[c] & O)
126 #define ALPHA 0x40 /* Alpha or underscore. */
127 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
129 #define CCLASSMASK 0x3f
130 #define CCLASS(c) (char_type[c] & CCLASSMASK)
135 #define NA ORDINARY | ALPHA
141 static u_char const char_type[] = {
142 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
143 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
144 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
145 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
146 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
147 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
148 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
149 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
150 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
151 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
152 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
153 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
154 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
155 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
156 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
157 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
159 * Meta chars; should be settable per character set;
160 * for now, treat them all as normal characters.
162 NA, NA, NA, NA, NA, NA, NA, NA,
163 NA, NA, NA, NA, NA, NA, NA, NA,
164 NA, NA, NA, NA, NA, NA, NA, NA,
165 NA, NA, NA, NA, NA, NA, NA, NA,
166 NA, NA, NA, NA, NA, NA, NA, NA,
167 NA, NA, NA, NA, NA, NA, NA, NA,
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
188 /* Macros to clear/set/test flags. */
189 #define SET(t, f) (t) |= (f)
190 #define CLR(t, f) (t) &= ~(f)
191 #define ISSET(t, f) ((t) & (f))
193 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
194 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
197 * Initial open of tty, or (re)entry to standard tty line discipline.
202 register struct tty *tp;
208 if (!ISSET(tp->t_state, TS_ISOPEN)) {
209 SET(tp->t_state, TS_ISOPEN);
210 if (ISSET(tp->t_cflag, CLOCAL))
211 SET(tp->t_state, TS_CONNECTED);
212 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
220 * Handle close() on a tty line: flush and set to initial state,
221 * bumping generation number so that pending read/write calls
222 * can detect recycling of the tty.
223 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
224 * and l_close() should have flushed, but we repeat the spltty() and
225 * the flush in case there are buggy callers.
229 register struct tty *tp;
237 ttyflush(tp, FREAD | FWRITE);
238 clist_free_cblocks(&tp->t_canq);
239 clist_free_cblocks(&tp->t_outq);
240 clist_free_cblocks(&tp->t_rawq);
243 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
244 snpdown((struct snoop *)tp->t_sc);
248 tp->t_line = TTYDISC;
250 tp->t_session = NULL;
256 #define FLUSHQ(q) { \
258 ndflush(q, (q)->c_cc); \
261 /* Is 'c' a line delimiter ("break" character)? */
262 #define TTBREAKC(c, lflag) \
263 ((c) == '\n' || (((c) == cc[VEOF] || \
264 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
265 (c) != _POSIX_VDISABLE))
268 * Process input of a single character received on a tty.
273 register struct tty *tp;
275 register tcflag_t iflag, lflag;
280 * If input is pending take it first.
283 if (ISSET(lflag, PENDIN))
288 if (ISSET(lflag, ICANON)) {
298 * Block further input iff:
299 * current input > threshold AND input is available to user program
300 * AND input flow control is enabled and not yet invoked.
301 * The 3 is slop for PARMRK.
304 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
305 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
306 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
307 !ISSET(tp->t_state, TS_TBLOCK))
310 /* Handle exceptional conditions (break, parity, framing). */
312 err = (ISSET(c, TTY_ERRORMASK));
314 CLR(c, TTY_ERRORMASK);
315 if (ISSET(err, TTY_BI)) {
316 if (ISSET(iflag, IGNBRK))
318 if (ISSET(iflag, BRKINT)) {
319 ttyflush(tp, FREAD | FWRITE);
320 pgsignal(tp->t_pgrp, SIGINT, 1);
323 if (ISSET(iflag, PARMRK))
325 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
326 || ISSET(err, TTY_FE)) {
327 if (ISSET(iflag, IGNPAR))
329 else if (ISSET(iflag, PARMRK)) {
331 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
334 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
335 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
336 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
343 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
345 if (!ISSET(lflag, EXTPROC)) {
347 * Check for literal nexting very first
349 if (ISSET(tp->t_state, TS_LNCH)) {
351 CLR(tp->t_state, TS_LNCH);
354 * Scan for special characters. This code
355 * is really just a big case statement with
356 * non-constant cases. The bottom of the
357 * case statement is labeled ``endcase'', so goto
358 * it after a case match, or similar.
362 * Control chars which aren't controlled
363 * by ICANON, ISIG, or IXON.
365 if (ISSET(lflag, IEXTEN)) {
366 if (CCEQ(cc[VLNEXT], c)) {
367 if (ISSET(lflag, ECHO)) {
368 if (ISSET(lflag, ECHOE)) {
369 (void)ttyoutput('^', tp);
370 (void)ttyoutput('\b', tp);
374 SET(tp->t_state, TS_LNCH);
377 if (CCEQ(cc[VDISCARD], c)) {
378 if (ISSET(lflag, FLUSHO))
379 CLR(tp->t_lflag, FLUSHO);
381 ttyflush(tp, FWRITE);
383 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
385 SET(tp->t_lflag, FLUSHO);
393 if (ISSET(lflag, ISIG)) {
394 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
395 if (!ISSET(lflag, NOFLSH))
396 ttyflush(tp, FREAD | FWRITE);
399 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
402 if (CCEQ(cc[VSUSP], c)) {
403 if (!ISSET(lflag, NOFLSH))
406 pgsignal(tp->t_pgrp, SIGTSTP, 1);
411 * Handle start/stop characters.
413 if (ISSET(iflag, IXON)) {
414 if (CCEQ(cc[VSTOP], c)) {
415 if (!ISSET(tp->t_state, TS_TTSTOP)) {
416 SET(tp->t_state, TS_TTSTOP);
417 #ifdef sun4c /* XXX */
418 (*tp->t_stop)(tp, 0);
420 (*cdevsw[major(tp->t_dev)]->d_stop)(tp,
425 if (!CCEQ(cc[VSTART], c))
428 * if VSTART == VSTOP then toggle
432 if (CCEQ(cc[VSTART], c))
436 * IGNCR, ICRNL, & INLCR
439 if (ISSET(iflag, IGNCR))
441 else if (ISSET(iflag, ICRNL))
443 } else if (c == '\n' && ISSET(iflag, INLCR))
446 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
448 * From here on down canonical mode character
449 * processing takes place.
454 if (CCEQ(cc[VERASE], c)) {
456 ttyrub(unputc(&tp->t_rawq), tp);
462 if (CCEQ(cc[VKILL], c)) {
463 if (ISSET(lflag, ECHOKE) &&
464 tp->t_rawq.c_cc == tp->t_rocount &&
465 !ISSET(lflag, ECHOPRT))
466 while (tp->t_rawq.c_cc)
467 ttyrub(unputc(&tp->t_rawq), tp);
470 if (ISSET(lflag, ECHOK) ||
471 ISSET(lflag, ECHOKE))
476 CLR(tp->t_state, TS_LOCAL);
482 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
488 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
493 * erase last char of word and remember the
494 * next chars type (for ALTWERASE)
497 c = unputc(&tp->t_rawq);
500 if (c == ' ' || c == '\t') {
501 (void)putc(c, &tp->t_rawq);
510 c = unputc(&tp->t_rawq);
513 } while (c != ' ' && c != '\t' &&
514 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
515 (void)putc(c, &tp->t_rawq);
521 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
526 * ^T - kernel info and generate SIGINFO
528 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
529 if (ISSET(lflag, ISIG))
530 pgsignal(tp->t_pgrp, SIGINFO, 1);
531 if (!ISSET(lflag, NOKERNINFO))
537 * Check for input buffer overflow
539 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
541 if (ISSET(iflag, IMAXBEL)) {
542 if (tp->t_outq.c_cc < tp->t_ohiwat)
543 (void)ttyoutput(CTRL('g'), tp);
548 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
549 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
550 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
553 * Put data char in q for user and
554 * wakeup on seeing a line delimiter.
556 if (putc(c, &tp->t_rawq) >= 0) {
557 if (!ISSET(lflag, ICANON)) {
562 if (TTBREAKC(c, lflag)) {
564 catq(&tp->t_rawq, &tp->t_canq);
566 } else if (tp->t_rocount++ == 0)
567 tp->t_rocol = tp->t_column;
568 if (ISSET(tp->t_state, TS_ERASE)) {
570 * end of prterase \.../
572 CLR(tp->t_state, TS_ERASE);
573 (void)ttyoutput('/', tp);
577 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
579 * Place the cursor over the '^' of the ^D.
581 i = imin(2, tp->t_column - i);
583 (void)ttyoutput('\b', tp);
590 * IXANY means allow any character to restart output.
592 if (ISSET(tp->t_state, TS_TTSTOP) &&
593 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
596 CLR(tp->t_lflag, FLUSHO);
597 CLR(tp->t_state, TS_TTSTOP);
599 return (ttstart(tp));
603 * Output a single character on a tty, doing output processing
604 * as needed (expanding tabs, newline processing, etc.).
605 * Returns < 0 if succeeds, otherwise returns char to resend.
611 register struct tty *tp;
613 register tcflag_t oflag;
617 if (!ISSET(oflag, OPOST)) {
618 if (ISSET(tp->t_lflag, FLUSHO))
620 if (putc(c, &tp->t_outq))
627 * Do tab expansion if OXTABS is set. Special case if we external
628 * processing, we don't do the tab expansion because we'll probably
629 * get it wrong. If tab expansion needs to be done, let it happen
632 CLR(c, ~TTY_CHARMASK);
634 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
635 c = 8 - (tp->t_column & 7);
636 if (!ISSET(tp->t_lflag, FLUSHO)) {
637 s = spltty(); /* Don't interrupt tabs. */
638 c -= b_to_q(" ", c, &tp->t_outq);
644 return (c ? -1 : '\t');
646 if (c == CEOT && ISSET(oflag, ONOEOT))
650 * Newline translation: if ONLCR is set,
651 * translate newline into "\r\n".
653 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
656 if (putc('\r', &tp->t_outq))
661 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
680 col = (col + 8) & ~7;
688 * Ioctls for all tty devices. Called after line-discipline specific ioctl
689 * has been called to do discipline-specific functions and/or reject any
690 * of these ioctl commands.
694 ttioctl(tp, cmd, data, flag)
695 register struct tty *tp;
700 register struct proc *p;
703 p = curproc; /* XXX */
705 /* If the ioctl involves modification, hang if in the background. */
718 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
728 while (isbackground(p, tp) &&
729 (p->p_flag & P_PPWAIT) == 0 &&
730 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
731 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
732 if (p->p_pgrp->pg_jobc == 0)
734 pgsignal(p->p_pgrp, SIGTTOU, 1);
735 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
743 switch (cmd) { /* Process the ioctl. */
744 case FIOASYNC: /* set/clear async i/o */
747 SET(tp->t_state, TS_ASYNC);
749 CLR(tp->t_state, TS_ASYNC);
752 case FIONBIO: /* set/clear non-blocking i/o */
753 break; /* XXX: delete. */
754 case FIONREAD: /* get # bytes to read */
756 *(int *)data = ttnread(tp);
759 case TIOCEXCL: /* set exclusive use of tty */
761 SET(tp->t_state, TS_XCLUDE);
764 case TIOCFLUSH: { /* flush buffers */
765 register int flags = *(int *)data;
768 flags = FREAD | FWRITE;
770 flags &= FREAD | FWRITE;
774 case TIOCCONS: /* become virtual console */
776 if (constty && constty != tp &&
777 ISSET(constty->t_state, TS_CONNECTED))
780 if (error = suser(p->p_ucred, &p->p_acflag))
784 } else if (tp == constty)
787 case TIOCDRAIN: /* wait till output drained */
792 case TIOCGETA: { /* get termios struct */
793 struct termios *t = (struct termios *)data;
795 bcopy(&tp->t_termios, t, sizeof(struct termios));
798 case TIOCGETD: /* get line discipline */
799 *(int *)data = tp->t_line;
801 case TIOCGWINSZ: /* get window size */
802 *(struct winsize *)data = tp->t_winsize;
804 case TIOCGPGRP: /* get pgrp of tty */
807 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
810 case TIOCHPCL: /* hang up on last close */
812 SET(tp->t_cflag, HUPCL);
816 case TIOCNXCL: /* reset exclusive use of tty */
818 CLR(tp->t_state, TS_XCLUDE);
821 case TIOCOUTQ: /* output queue size */
822 *(int *)data = tp->t_outq.c_cc;
824 case TIOCSETA: /* set termios struct */
825 case TIOCSETAW: /* drain output, set */
826 case TIOCSETAF: { /* drn out, fls in, set */
827 register struct termios *t = (struct termios *)data;
829 if (t->c_ispeed < 0 || t->c_ospeed < 0)
832 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
838 if (cmd == TIOCSETAF)
841 if (!ISSET(t->c_cflag, CIGNORE)) {
843 * Set device hardware.
845 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
849 if (ISSET(t->c_cflag, CLOCAL) &&
850 !ISSET(tp->t_cflag, CLOCAL)) {
852 * XXX disconnections would be too hard to
853 * get rid of without this kludge. The only
854 * way to get rid of controlling terminals
855 * is to exit from the session leader.
857 CLR(tp->t_state, TS_ZOMBIE);
859 wakeup(TSA_CARR_ON(tp));
863 if ((ISSET(tp->t_state, TS_CARR_ON) ||
864 ISSET(t->c_cflag, CLOCAL)) &&
865 !ISSET(tp->t_state, TS_ZOMBIE))
866 SET(tp->t_state, TS_CONNECTED);
868 CLR(tp->t_state, TS_CONNECTED);
869 tp->t_cflag = t->c_cflag;
870 tp->t_ispeed = t->c_ispeed;
871 tp->t_ospeed = t->c_ospeed;
874 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
876 if (ISSET(t->c_lflag, ICANON))
877 SET(tp->t_lflag, PENDIN);
880 * XXX we really shouldn't allow toggling
881 * ICANON while we're in a non-termios line
882 * discipline. Now we have to worry about
883 * panicing for a null queue.
885 if (tp->t_canq.c_cbreserved > 0 &&
886 tp->t_rawq.c_cbreserved > 0) {
887 catq(&tp->t_rawq, &tp->t_canq);
889 * XXX the queue limits may be
890 * different, so the old queue
891 * swapping method no longer works.
893 catq(&tp->t_canq, &tp->t_rawq);
895 CLR(tp->t_lflag, PENDIN);
899 tp->t_iflag = t->c_iflag;
900 tp->t_oflag = t->c_oflag;
902 * Make the EXTPROC bit read only.
904 if (ISSET(tp->t_lflag, EXTPROC))
905 SET(t->c_lflag, EXTPROC);
907 CLR(t->c_lflag, EXTPROC);
908 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
909 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
910 t->c_cc[VTIME] != tp->t_cc[VTIME])
912 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
916 case TIOCSETD: { /* set line discipline */
917 register int t = *(int *)data;
918 dev_t device = tp->t_dev;
920 if ((u_int)t >= nlinesw)
922 if (t != tp->t_line) {
924 (*linesw[tp->t_line].l_close)(tp, flag);
925 error = (*linesw[t].l_open)(device, tp);
927 (void)(*linesw[tp->t_line].l_open)(device, tp);
936 case TIOCSTART: /* start output, like ^Q */
938 if (ISSET(tp->t_state, TS_TTSTOP) ||
939 ISSET(tp->t_lflag, FLUSHO)) {
940 CLR(tp->t_lflag, FLUSHO);
941 CLR(tp->t_state, TS_TTSTOP);
946 case TIOCSTI: /* simulate terminal input */
947 if (p->p_ucred->cr_uid && (flag & FREAD) == 0)
949 if (p->p_ucred->cr_uid && !isctty(p, tp))
952 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
955 case TIOCSTOP: /* stop output, like ^S */
957 if (!ISSET(tp->t_state, TS_TTSTOP)) {
958 SET(tp->t_state, TS_TTSTOP);
959 #ifdef sun4c /* XXX */
960 (*tp->t_stop)(tp, 0);
962 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0);
967 case TIOCSCTTY: /* become controlling tty */
968 /* Session ctty vnode pointer set in vnode layer. */
969 if (!SESS_LEADER(p) ||
970 ((p->p_session->s_ttyvp || tp->t_session) &&
971 (tp->t_session != p->p_session)))
973 tp->t_session = p->p_session;
974 tp->t_pgrp = p->p_pgrp;
975 p->p_session->s_ttyp = tp;
976 p->p_flag |= P_CONTROLT;
978 case TIOCSPGRP: { /* set pgrp of tty */
979 register struct pgrp *pgrp = pgfind(*(int *)data);
983 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
988 case TIOCSTAT: /* simulate control-T */
993 case TIOCSWINSZ: /* set window size */
994 if (bcmp((caddr_t)&tp->t_winsize, data,
995 sizeof (struct winsize))) {
996 tp->t_winsize = *(struct winsize *)data;
997 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1000 case TIOCSDRAINWAIT:
1001 error = suser(p->p_ucred, &p->p_acflag);
1004 tp->t_timeout = *(int *)data * hz;
1005 wakeup(TSA_OCOMPLETE(tp));
1006 wakeup(TSA_OLOWAT(tp));
1008 case TIOCGDRAINWAIT:
1009 *(int *)data = tp->t_timeout / hz;
1012 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1013 return (ttcompat(tp, cmd, data, flag));
1022 ttypoll(tp, events, p)
1030 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1031 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1035 if (events & (POLLIN | POLLRDNORM))
1036 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1037 revents |= events & (POLLIN | POLLRDNORM);
1039 selrecord(p, &tp->t_rsel);
1041 if (events & (POLLOUT | POLLWRNORM))
1042 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1043 ISSET(tp->t_state, TS_CONNECTED))
1044 || ISSET(tp->t_state, TS_ZOMBIE))
1045 revents |= events & (POLLOUT | POLLWRNORM);
1047 selrecord(p, &tp->t_wsel);
1053 * This is a wrapper for compatibility with the select vector used by
1054 * cdevsw. It relies on a proper xxxdevtotty routine.
1057 ttpoll(dev, events, p)
1062 return ttypoll((*cdevsw[major(dev)]->d_devtotty)(dev), events, p);
1066 * Must be called at spltty().
1074 if (ISSET(tp->t_lflag, PENDIN))
1076 nread = tp->t_canq.c_cc;
1077 if (!ISSET(tp->t_lflag, ICANON)) {
1078 nread += tp->t_rawq.c_cc;
1079 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1086 * Wait for output to drain.
1090 register struct tty *tp;
1096 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1097 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1099 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1100 ISSET(tp->t_state, TS_CONNECTED)) {
1101 SET(tp->t_state, TS_SO_OCOMPLETE);
1102 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1103 TTOPRI | PCATCH, "ttywai",
1106 if (error == EWOULDBLOCK)
1113 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1120 * Flush if successfully wait.
1128 if ((error = ttywait(tp)) == 0)
1129 ttyflush(tp, FREAD);
1134 * Flush tty read and/or write queues, notifying anyone waiting.
1138 register struct tty *tp;
1148 FLUSHQ(&tp->t_outq);
1149 CLR(tp->t_state, TS_TTSTOP);
1151 #ifdef sun4c /* XXX */
1152 (*tp->t_stop)(tp, rw);
1154 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw);
1157 FLUSHQ(&tp->t_canq);
1158 FLUSHQ(&tp->t_rawq);
1159 CLR(tp->t_lflag, PENDIN);
1162 CLR(tp->t_state, TS_LOCAL);
1164 if (ISSET(tp->t_state, TS_TBLOCK)) {
1166 FLUSHQ(&tp->t_outq);
1170 * Don't let leave any state that might clobber the
1171 * next line discipline (although we should do more
1172 * to send the START char). Not clearing the state
1173 * may have caused the "putc to a clist with no
1174 * reserved cblocks" panic/printf.
1176 CLR(tp->t_state, TS_TBLOCK);
1178 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1179 if (ISSET(tp->t_iflag, IXOFF)) {
1181 * XXX wait a bit in the hope that the stop
1182 * character (if any) will go out. Waiting
1183 * isn't good since it allows races. This
1184 * will be fixed when the stop character is
1185 * put in a special queue. Don't bother with
1186 * the checks in ttywait() since the timeout
1189 SET(tp->t_state, TS_SO_OCOMPLETE);
1190 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1193 * Don't try sending the stop character again.
1195 CLR(tp->t_state, TS_TBLOCK);
1202 FLUSHQ(&tp->t_outq);
1209 * Copy in the default termios characters.
1216 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1227 termioschars(&tp->t_termios);
1231 * Handle input high water. Send stop character for the IXOFF case. Turn
1232 * on our input flow control bit and propagate the changes to the driver.
1233 * XXX the stop character should be put in a special high priority queue.
1240 SET(tp->t_state, TS_TBLOCK);
1241 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1242 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1243 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1248 * Handle input low water. Send start character for the IXOFF case. Turn
1249 * off our input flow control bit and propagate the changes to the driver.
1250 * XXX the start character should be put in a special high priority queue.
1257 CLR(tp->t_state, TS_TBLOCK);
1258 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1259 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1260 SET(tp->t_state, TS_TBLOCK); /* try again later */
1265 /* Not used by any current (i386) drivers. */
1267 * Restart after an inter-char delay.
1283 CLR(tp->t_state, TS_TIMEOUT);
1295 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1301 * "close" a line discipline
1309 if (flag & FNONBLOCK || ttywflush(tp))
1310 ttyflush(tp, FREAD | FWRITE);
1315 * Handle modem control transition on a tty.
1316 * Flag indicates new state of carrier.
1317 * Returns 0 if the line should be turned off, otherwise 1.
1321 register struct tty *tp;
1325 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1327 * MDMBUF: do flow control according to carrier flag
1328 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1329 * works if IXON and IXANY are clear.
1332 CLR(tp->t_state, TS_CAR_OFLOW);
1333 CLR(tp->t_state, TS_TTSTOP);
1335 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1336 SET(tp->t_state, TS_CAR_OFLOW);
1337 SET(tp->t_state, TS_TTSTOP);
1338 #ifdef sun4c /* XXX */
1339 (*tp->t_stop)(tp, 0);
1341 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0);
1344 } else if (flag == 0) {
1348 CLR(tp->t_state, TS_CARR_ON);
1349 if (ISSET(tp->t_state, TS_ISOPEN) &&
1350 !ISSET(tp->t_cflag, CLOCAL)) {
1351 SET(tp->t_state, TS_ZOMBIE);
1352 CLR(tp->t_state, TS_CONNECTED);
1353 if (tp->t_session && tp->t_session->s_leader)
1354 psignal(tp->t_session->s_leader, SIGHUP);
1355 ttyflush(tp, FREAD | FWRITE);
1362 SET(tp->t_state, TS_CARR_ON);
1363 if (!ISSET(tp->t_state, TS_ZOMBIE))
1364 SET(tp->t_state, TS_CONNECTED);
1365 wakeup(TSA_CARR_ON(tp));
1373 * Reinput pending characters after state switch
1378 register struct tty *tp;
1383 CLR(tp->t_lflag, PENDIN);
1384 SET(tp->t_state, TS_TYPEN);
1386 * XXX this assumes too much about clist internals. It may even
1387 * fail if the cblock slush pool is empty. We can't allocate more
1388 * cblocks here because we are called from an interrupt handler
1389 * and clist_alloc_cblocks() can wait.
1392 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1393 tp->t_rawq.c_cbmax = tq.c_cbmax;
1394 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1395 while ((c = getc(&tq)) >= 0)
1397 CLR(tp->t_state, TS_TYPEN);
1401 * Process a read call on a tty device.
1404 ttread(tp, uio, flag)
1405 register struct tty *tp;
1409 register struct clist *qp;
1411 register tcflag_t lflag;
1412 register cc_t *cc = tp->t_cc;
1413 register struct proc *p = curproc;
1414 int s, first, error = 0;
1415 int has_stime = 0, last_cc = 0;
1416 long slp = 0; /* XXX this should be renamed `timo'. */
1420 lflag = tp->t_lflag;
1422 * take pending input first
1424 if (ISSET(lflag, PENDIN)) {
1426 splx(s); /* reduce latency */
1428 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1432 * Hang process if it's in the background.
1434 if (isbackground(p, tp)) {
1436 if ((p->p_sigignore & sigmask(SIGTTIN)) ||
1437 (p->p_sigmask & sigmask(SIGTTIN)) ||
1438 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
1440 pgsignal(p->p_pgrp, SIGTTIN, 1);
1441 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1447 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1449 return (0); /* EOF */
1453 * If canonical, use the canonical queue,
1454 * else use the raw queue.
1456 * (should get rid of clists...)
1458 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1460 if (flag & IO_NDELAY) {
1463 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1468 return (EWOULDBLOCK);
1470 if (!ISSET(lflag, ICANON)) {
1473 struct timeval stime, timecopy;
1476 * Check each of the four combinations.
1477 * (m > 0 && t == 0) is the normal read case.
1478 * It should be fairly efficient, so we check that and its
1479 * companion case (m == 0 && t == 0) first.
1480 * For the other two cases, we compute the target sleep time
1489 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1493 t *= 100000; /* time in us */
1494 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1495 ((t1).tv_usec - (t2).tv_usec))
1501 getmicrotime(&timecopy);
1503 /* first character, start timer */
1507 } else if (qp->c_cc > last_cc) {
1508 /* got a character, restart timer */
1512 /* nothing, check expiration */
1513 slp = t - diff(timecopy, stime);
1518 } else { /* m == 0 */
1521 getmicrotime(&timecopy);
1527 slp = t - diff(timecopy, stime);
1529 /* Timed out, but 0 is enough input. */
1537 * Rounding down may make us wake up just short
1538 * of the target, so we round up.
1539 * The formula is ceiling(slp * hz/1000000).
1540 * 32-bit arithmetic is enough for hz < 169.
1541 * XXX see tvtohz() for how to avoid overflow if hz
1542 * is large (divide by `tick' and/or arrange to
1543 * use tvtohz() if hz is large).
1545 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1548 if (qp->c_cc <= 0) {
1551 * There is no input, or not enough input and we can block.
1553 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1554 ISSET(tp->t_state, TS_CONNECTED) ?
1555 "ttyin" : "ttyhup", (int)slp);
1557 if (error == EWOULDBLOCK)
1562 * XXX what happens if another process eats some input
1563 * while we are asleep (not just here)? It would be
1564 * safest to detect changes and reset our state variables
1565 * (has_stime and last_cc).
1573 * Input present, check for input mapping and processing.
1576 if (ISSET(lflag, ICANON | ISIG))
1582 icc = imin(uio->uio_resid, IBUFSIZ);
1583 icc = q_to_b(qp, ibuf, icc);
1589 error = uiomove(ibuf, icc, uio);
1591 * XXX if there was an error then we should ungetc() the
1592 * unmoved chars and reduce icc here.
1595 if (ISSET(tp->t_lflag, ECHO) &&
1596 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1597 snpin((struct snoop *)tp->t_sc, ibuf, icc);
1601 if (uio->uio_resid == 0)
1615 * delayed suspend (^Y)
1617 if (CCEQ(cc[VDSUSP], c) &&
1618 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1619 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1621 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1630 * Interpret EOF only in canonical mode.
1632 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1635 * Give user character.
1637 error = ureadc(c, uio);
1639 /* XXX should ungetc(c, qp). */
1643 * Only snoop directly on input in echo mode. Non-echoed
1644 * input will be snooped later iff the application echoes it.
1646 if (ISSET(tp->t_lflag, ECHO) &&
1647 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1648 snpinc((struct snoop *)tp->t_sc, (char)c);
1650 if (uio->uio_resid == 0)
1653 * In canonical mode check for a "break character"
1654 * marking the end of a "line of input".
1656 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1663 * Look to unblock input now that (presumably)
1664 * the input queue has gone down.
1667 if (ISSET(tp->t_state, TS_TBLOCK) &&
1668 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1676 * Check the output queue on tp for space for a kernel message (from uprintf
1677 * or tprintf). Allow some space over the normal hiwater mark so we don't
1678 * lose messages due to normal flow control, but don't let the tty run amok.
1679 * Sleeps here are not interruptible, but we return prematurely if new signals
1683 ttycheckoutq(tp, wait)
1684 register struct tty *tp;
1687 int hiwat, s, oldsig;
1689 hiwat = tp->t_ohiwat;
1691 oldsig = wait ? curproc->p_siglist : 0;
1692 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1693 while (tp->t_outq.c_cc > hiwat) {
1695 if (tp->t_outq.c_cc <= hiwat)
1697 if (wait == 0 || curproc->p_siglist != oldsig) {
1701 SET(tp->t_state, TS_SO_OLOWAT);
1702 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1709 * Process a write call on a tty device.
1712 ttwrite(tp, uio, flag)
1713 register struct tty *tp;
1714 register struct uio *uio;
1717 register char *cp = NULL;
1718 register int cc, ce;
1719 register struct proc *p;
1720 int i, hiwat, cnt, error, s;
1723 hiwat = tp->t_ohiwat;
1724 cnt = uio->uio_resid;
1729 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1731 if (uio->uio_resid == cnt)
1735 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1736 if (flag & IO_NDELAY) {
1738 error = EWOULDBLOCK;
1741 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1750 * Hang the process if it's in the background.
1753 if (isbackground(p, tp) &&
1754 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
1755 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
1756 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
1757 if (p->p_pgrp->pg_jobc == 0) {
1761 pgsignal(p->p_pgrp, SIGTTOU, 1);
1762 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1768 * Process the user's data in at most OBUFSIZ chunks. Perform any
1769 * output translation. Keep track of high water mark, sleep on
1770 * overflow awaiting device aid in acquiring new space.
1772 while (uio->uio_resid > 0 || cc > 0) {
1773 if (ISSET(tp->t_lflag, FLUSHO)) {
1777 if (tp->t_outq.c_cc > hiwat)
1780 * Grab a hunk of data from the user, unless we have some
1781 * leftover from last time.
1784 cc = imin(uio->uio_resid, OBUFSIZ);
1786 error = uiomove(cp, cc, uio);
1792 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1793 snpin((struct snoop *)tp->t_sc, cp, cc);
1797 * If nothing fancy need be done, grab those characters we
1798 * can handle without any of ttyoutput's processing and
1799 * just transfer them to the output q. For those chars
1800 * which require special processing (as indicated by the
1801 * bits in char_type), call ttyoutput. After processing
1802 * a hunk of data, look for FLUSHO so ^O's will take effect
1806 if (!ISSET(tp->t_oflag, OPOST))
1809 ce = cc - scanc((u_int)cc, (u_char *)cp,
1810 char_type, CCLASSMASK);
1812 * If ce is zero, then we're processing
1813 * a special character through ttyoutput.
1817 if (ttyoutput(*cp, tp) >= 0) {
1818 /* No Clists, wait a bit. */
1820 if (flag & IO_NDELAY) {
1821 error = EWOULDBLOCK;
1824 error = ttysleep(tp, &lbolt,
1833 if (ISSET(tp->t_lflag, FLUSHO) ||
1834 tp->t_outq.c_cc > hiwat)
1840 * A bunch of normal characters have been found.
1841 * Transfer them en masse to the output queue and
1842 * continue processing at the top of the loop.
1843 * If there are any further characters in this
1844 * <= OBUFSIZ chunk, the first should be a character
1845 * requiring special handling by ttyoutput.
1848 i = b_to_q(cp, ce, &tp->t_outq);
1851 cp += ce, cc -= ce, tk_nout += ce;
1854 /* No Clists, wait a bit. */
1856 if (flag & IO_NDELAY) {
1857 error = EWOULDBLOCK;
1860 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1866 if (ISSET(tp->t_lflag, FLUSHO) ||
1867 tp->t_outq.c_cc > hiwat)
1874 * If cc is nonzero, we leave the uio structure inconsistent, as the
1875 * offset and iov pointers have moved forward, but it doesn't matter
1876 * (the call will either return short or restart with a new uio).
1878 uio->uio_resid += cc;
1885 * This can only occur if FLUSHO is set in t_lflag,
1886 * or if ttstart/oproc is synchronous (or very fast).
1888 if (tp->t_outq.c_cc <= hiwat) {
1892 if (flag & IO_NDELAY) {
1894 uio->uio_resid += cc;
1895 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1897 SET(tp->t_state, TS_SO_OLOWAT);
1898 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1901 if (error == EWOULDBLOCK)
1909 * Rubout one character from the rawq of tp
1910 * as cleanly as possible.
1915 register struct tty *tp;
1918 register int savecol;
1921 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
1923 CLR(tp->t_lflag, FLUSHO);
1924 if (ISSET(tp->t_lflag, ECHOE)) {
1925 if (tp->t_rocount == 0) {
1927 * Screwed by ttwrite; retype
1932 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
1935 CLR(c, ~TTY_CHARMASK);
1936 switch (CCLASS(c)) {
1945 if (ISSET(tp->t_lflag, ECHOCTL))
1949 if (tp->t_rocount < tp->t_rawq.c_cc) {
1954 savecol = tp->t_column;
1955 SET(tp->t_state, TS_CNTTB);
1956 SET(tp->t_lflag, FLUSHO);
1957 tp->t_column = tp->t_rocol;
1958 cp = tp->t_rawq.c_cf;
1960 tabc = *cp; /* XXX FIX NEXTC */
1961 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
1963 CLR(tp->t_lflag, FLUSHO);
1964 CLR(tp->t_state, TS_CNTTB);
1967 /* savecol will now be length of the tab. */
1968 savecol -= tp->t_column;
1969 tp->t_column += savecol;
1971 savecol = 8; /* overflow screw */
1972 while (--savecol >= 0)
1973 (void)ttyoutput('\b', tp);
1976 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
1977 (void)printf(PANICSTR, c, CCLASS(c));
1979 panic(PANICSTR, c, CCLASS(c));
1983 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
1984 if (!ISSET(tp->t_state, TS_ERASE)) {
1985 SET(tp->t_state, TS_ERASE);
1986 (void)ttyoutput('\\', tp);
1990 ttyecho(tp->t_cc[VERASE], tp);
1995 * Back over cnt characters, erasing them.
1999 register struct tty *tp;
2004 (void)ttyoutput('\b', tp);
2005 (void)ttyoutput(' ', tp);
2006 (void)ttyoutput('\b', tp);
2012 * Reprint the rawq line. Note, it is assumed that c_cc has already
2017 register struct tty *tp;
2022 /* Echo the reprint character. */
2023 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2024 ttyecho(tp->t_cc[VREPRINT], tp);
2026 (void)ttyoutput('\n', tp);
2030 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2031 * BIT OF FIRST CHAR.
2034 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2035 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2037 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2038 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2040 CLR(tp->t_state, TS_ERASE);
2043 tp->t_rocount = tp->t_rawq.c_cc;
2048 * Echo a typed character to the terminal.
2053 register struct tty *tp;
2056 if (!ISSET(tp->t_state, TS_CNTTB))
2057 CLR(tp->t_lflag, FLUSHO);
2058 if ((!ISSET(tp->t_lflag, ECHO) &&
2059 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2060 ISSET(tp->t_lflag, EXTPROC))
2062 if (ISSET(tp->t_lflag, ECHOCTL) &&
2063 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2064 ISSET(c, TTY_CHARMASK) == 0177)) {
2065 (void)ttyoutput('^', tp);
2066 CLR(c, ~TTY_CHARMASK);
2072 (void)ttyoutput(c, tp);
2076 * Wake up any readers on a tty.
2080 register struct tty *tp;
2083 if (tp->t_rsel.si_pid != 0)
2084 selwakeup(&tp->t_rsel);
2085 if (ISSET(tp->t_state, TS_ASYNC))
2086 pgsignal(tp->t_pgrp, SIGIO, 1);
2087 wakeup(TSA_HUP_OR_INPUT(tp));
2091 * Wake up any writers on a tty.
2095 register struct tty *tp;
2098 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2099 selwakeup(&tp->t_wsel);
2100 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2101 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2102 CLR(tp->t_state, TS_SO_OCOMPLETE);
2103 wakeup(TSA_OCOMPLETE(tp));
2105 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2106 tp->t_outq.c_cc <= tp->t_olowat) {
2107 CLR(tp->t_state, TS_SO_OLOWAT);
2108 wakeup(TSA_OLOWAT(tp));
2113 * Look up a code for a specified speed in a conversion table;
2114 * used by drivers to map software speed values to hardware parameters.
2117 ttspeedtab(speed, table)
2119 register struct speedtab *table;
2122 for ( ; table->sp_speed != -1; table++)
2123 if (table->sp_speed == speed)
2124 return (table->sp_code);
2129 * Set input and output watermarks and buffer sizes. For input, the
2130 * high watermark is about one second's worth of input above empty, the
2131 * low watermark is slightly below high water, and the buffer size is a
2132 * driver-dependent amount above high water. For output, the watermarks
2133 * are near the ends of the buffer, with about 1 second's worth of input
2134 * between them. All this only applies to the standard line discipline.
2140 register int cps, ttmaxhiwat, x;
2143 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2144 switch (tp->t_ispeedwat) {
2146 cps = tp->t_ispeed / 10;
2150 * This case is for old drivers that don't know about
2151 * t_ispeedwat. Arrange for them to get the old buffer
2152 * sizes and watermarks.
2154 cps = TTYHOG - 2 * 256;
2155 tp->t_ififosize = 2 * 256;
2158 cps = tp->t_ispeedwat / 10;
2162 tp->t_ilowat = 7 * cps / 8;
2163 x = cps + tp->t_ififosize;
2164 clist_alloc_cblocks(&tp->t_rawq, x, x);
2167 switch (tp->t_ospeedwat) {
2169 cps = tp->t_ospeed / 10;
2170 ttmaxhiwat = 2 * TTMAXHIWAT;
2173 cps = tp->t_ospeed / 10;
2174 ttmaxhiwat = TTMAXHIWAT;
2177 cps = tp->t_ospeedwat / 10;
2178 ttmaxhiwat = 8 * TTMAXHIWAT;
2181 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2182 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2184 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2185 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2186 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2188 clist_alloc_cblocks(&tp->t_outq, x, x);
2193 * Report on state of foreground process group.
2197 register struct tty *tp;
2199 register struct proc *p, *pick;
2200 struct timeval utime, stime;
2203 if (ttycheckoutq(tp,0) == 0)
2206 /* Print load average. */
2207 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2208 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2210 if (tp->t_session == NULL)
2211 ttyprintf(tp, "not a controlling terminal\n");
2212 else if (tp->t_pgrp == NULL)
2213 ttyprintf(tp, "no foreground process group\n");
2214 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0)
2215 ttyprintf(tp, "empty foreground process group\n");
2217 /* Pick interesting process. */
2218 for (pick = NULL; p != 0; p = p->p_pglist.le_next)
2219 if (proc_compare(pick, p))
2222 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2223 pick->p_stat == SRUN ? "running" :
2224 pick->p_wmesg ? pick->p_wmesg : "iowait");
2226 calcru(pick, &utime, &stime, NULL);
2228 /* Print user time. */
2229 ttyprintf(tp, "%ld.%02ldu ",
2230 utime.tv_sec, utime.tv_usec / 10000);
2232 /* Print system time. */
2233 ttyprintf(tp, "%ld.%02lds ",
2234 stime.tv_sec, stime.tv_usec / 10000);
2236 #define pgtok(a) (((a) * PAGE_SIZE) / 1024)
2237 /* Print percentage cpu, resident set size. */
2238 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2239 ttyprintf(tp, "%d%% %ldk\n",
2241 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2242 #ifdef pmap_resident_count
2243 (long)pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap))
2245 (long)pgtok(pick->p_vmspace->vm_rssize)
2249 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2253 * Returns 1 if p2 is "better" than p1
2255 * The algorithm for picking the "interesting" process is thus:
2257 * 1) Only foreground processes are eligible - implied.
2258 * 2) Runnable processes are favored over anything else. The runner
2259 * with the highest cpu utilization is picked (p_estcpu). Ties are
2260 * broken by picking the highest pid.
2261 * 3) The sleeper with the shortest sleep time is next. With ties,
2262 * we pick out just "short-term" sleepers (P_SINTR == 0).
2263 * 4) Further ties are broken by picking the highest pid.
2265 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2266 #define TESTAB(a, b) ((a)<<1 | (b))
2272 proc_compare(p1, p2)
2273 register struct proc *p1, *p2;
2279 * see if at least one of them is runnable
2281 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2288 * tie - favor one with highest recent cpu utilization
2290 if (p2->p_estcpu > p1->p_estcpu)
2292 if (p1->p_estcpu > p2->p_estcpu)
2294 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2299 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2305 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2308 * pick the one with the smallest sleep time
2310 if (p2->p_slptime > p1->p_slptime)
2312 if (p1->p_slptime > p2->p_slptime)
2315 * favor one sleeping in a non-interruptible sleep
2317 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2319 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2321 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2325 * Output char to tty; console putchar style.
2335 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2340 (void)ttyoutput('\r', tp);
2341 (void)ttyoutput(c, tp);
2348 * Sleep on chan, returning ERESTART if tty changed while we napped and
2349 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2350 * the tty is revoked, restarting a pending call will redo validation done
2351 * at the start of the call.
2354 ttysleep(tp, chan, pri, wmesg, timo)
2364 error = tsleep(chan, pri, wmesg, timo);
2367 return (tp->t_gen == gen ? 0 : ERESTART);
2372 * XXX this is usable not useful or used. Most tty drivers have
2373 * ifdefs for using ttymalloc() but assume a different interface.
2376 * Allocate a tty struct. Clists in the struct will be allocated by
2384 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2385 bzero(tp, sizeof *tp);
2390 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2392 * Free a tty struct. Clists in the struct should have been freed by