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tty.c (9622) tty.c (9624)
1/*-
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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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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
36 * SUCH DAMAGE.
37 *
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
1/*-
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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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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
36 * SUCH DAMAGE.
37 *
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $Id: tty.c,v 1.52 1995/07/21 16:30:51 bde Exp $
39 * $Id: tty.c,v 1.53 1995/07/21 17:30:12 bde Exp $
40 */
41
42/*-
43 * TODO:
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.

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94
95
96static int proc_compare __P((struct proc *p1, struct proc *p2));
97static int ttnread __P((struct tty *));
98static void ttyblock __P((struct tty *tp));
99static void ttyecho __P((int, struct tty *tp));
100static void ttyrubo __P((struct tty *, int));
101
40 */
41
42/*-
43 * TODO:
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.

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94
95
96static int proc_compare __P((struct proc *p1, struct proc *p2));
97static int ttnread __P((struct tty *));
98static void ttyblock __P((struct tty *tp));
99static void ttyecho __P((int, struct tty *tp));
100static void ttyrubo __P((struct tty *, int));
101
102/* Symbolic sleep message strings. */
103char ttclos[] = "ttycls";
104char ttopen[] = "ttyopn";
105char ttybg[] = "ttybg";
106char ttybuf[] = "ttybuf";
107char ttyin[] = "ttyin";
108char ttyout[] = "ttyout";
109
110/*
111 * Table with character classes and parity. The 8th bit indicates parity,
112 * the 7th bit indicates the character is an alphameric or underscore (for
113 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
114 * are 0 then the character needs no special processing on output; classes
115 * other than 0 might be translated or (not currently) require delays.
116 */
117#define E 0x00 /* Even parity. */

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715 case TIOCSETP:
716 case TIOCSLTC:
717#endif
718 while (isbackground(curproc, tp) &&
719 p->p_pgrp->pg_jobc && (p->p_flag & P_PPWAIT) == 0 &&
720 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
721 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
722 pgsignal(p->p_pgrp, SIGTTOU, 1);
102/*
103 * Table with character classes and parity. The 8th bit indicates parity,
104 * the 7th bit indicates the character is an alphameric or underscore (for
105 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
106 * are 0 then the character needs no special processing on output; classes
107 * other than 0 might be translated or (not currently) require delays.
108 */
109#define E 0x00 /* Even parity. */

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707 case TIOCSETP:
708 case TIOCSLTC:
709#endif
710 while (isbackground(curproc, tp) &&
711 p->p_pgrp->pg_jobc && (p->p_flag & P_PPWAIT) == 0 &&
712 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
713 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
714 pgsignal(p->p_pgrp, SIGTTOU, 1);
723 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, ttybg, 0);
715 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
716 0);
724 if (error)
725 return (error);
726 }
727 break;
728 }
729
730 switch (cmd) { /* Process the ioctl. */
731 case FIOASYNC: /* set/clear async i/o */

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1381 */
1382 if (isbackground(p, tp)) {
1383 splx(s);
1384 if ((p->p_sigignore & sigmask(SIGTTIN)) ||
1385 (p->p_sigmask & sigmask(SIGTTIN)) ||
1386 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
1387 return (EIO);
1388 pgsignal(p->p_pgrp, SIGTTIN, 1);
717 if (error)
718 return (error);
719 }
720 break;
721 }
722
723 switch (cmd) { /* Process the ioctl. */
724 case FIOASYNC: /* set/clear async i/o */

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1374 */
1375 if (isbackground(p, tp)) {
1376 splx(s);
1377 if ((p->p_sigignore & sigmask(SIGTTIN)) ||
1378 (p->p_sigmask & sigmask(SIGTTIN)) ||
1379 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
1380 return (EIO);
1381 pgsignal(p->p_pgrp, SIGTTIN, 1);
1389 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0);
1382 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1390 if (error)
1391 return (error);
1392 goto loop;
1393 }
1394
1395 /*
1396 * If canonical, use the canonical queue,
1397 * else use the raw queue.

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1506sleep:
1507 carrier = ISSET(tp->t_state, TS_CARR_ON) ||
1508 ISSET(tp->t_cflag, CLOCAL);
1509 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) {
1510 splx(s);
1511 return (0); /* EOF */
1512 }
1513 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
1383 if (error)
1384 return (error);
1385 goto loop;
1386 }
1387
1388 /*
1389 * If canonical, use the canonical queue,
1390 * else use the raw queue.

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1499sleep:
1500 carrier = ISSET(tp->t_state, TS_CARR_ON) ||
1501 ISSET(tp->t_cflag, CLOCAL);
1502 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) {
1503 splx(s);
1504 return (0); /* EOF */
1505 }
1506 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
1514 carrier ? ttyin : ttopen, (int)slp);
1507 carrier ?
1508 "ttyin" : "ttyhup", (int)slp);
1515 splx(s);
1516 if (error == EWOULDBLOCK)
1517 error = 0;
1518 else if (error)
1519 return (error);
1520 /*
1521 * XXX what happens if another process eats some input
1522 * while we are asleep (not just here)? It would be

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1571 break;
1572 }
1573 /*
1574 * delayed suspend (^Y)
1575 */
1576 if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, ISIG)) {
1577 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1578 if (first) {
1509 splx(s);
1510 if (error == EWOULDBLOCK)
1511 error = 0;
1512 else if (error)
1513 return (error);
1514 /*
1515 * XXX what happens if another process eats some input
1516 * while we are asleep (not just here)? It would be

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1565 break;
1566 }
1567 /*
1568 * delayed suspend (^Y)
1569 */
1570 if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, ISIG)) {
1571 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1572 if (first) {
1579 error = ttysleep(tp,
1580 &lbolt, TTIPRI | PCATCH, ttybg, 0);
1573 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1574 "ttybg3", 0);
1581 if (error)
1582 break;
1583 goto loop;
1584 }
1585 break;
1586 }
1587 /*
1588 * Interpret EOF only in canonical mode.

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1698 splx(s);
1699 return (EIO);
1700 } else if (flag & IO_NDELAY) {
1701 splx(s);
1702 error = EWOULDBLOCK;
1703 goto out;
1704 } else {
1705 /* Sleep awaiting carrier. */
1575 if (error)
1576 break;
1577 goto loop;
1578 }
1579 break;
1580 }
1581 /*
1582 * Interpret EOF only in canonical mode.

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1692 splx(s);
1693 return (EIO);
1694 } else if (flag & IO_NDELAY) {
1695 splx(s);
1696 error = EWOULDBLOCK;
1697 goto out;
1698 } else {
1699 /* Sleep awaiting carrier. */
1706 error = ttysleep(tp,
1707 &tp->t_rawq, TTIPRI | PCATCH,ttopen, 0);
1700 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
1701 "ttydcd", 0);
1708 splx(s);
1709 if (error)
1710 goto out;
1711 goto loop;
1712 }
1713 }
1714 splx(s);
1715 /*
1716 * Hang the process if it's in the background.
1717 */
1718 p = curproc;
1719 if (isbackground(p, tp) &&
1720 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
1721 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
1722 (p->p_sigmask & sigmask(SIGTTOU)) == 0 &&
1723 p->p_pgrp->pg_jobc) {
1724 pgsignal(p->p_pgrp, SIGTTOU, 1);
1702 splx(s);
1703 if (error)
1704 goto out;
1705 goto loop;
1706 }
1707 }
1708 splx(s);
1709 /*
1710 * Hang the process if it's in the background.
1711 */
1712 p = curproc;
1713 if (isbackground(p, tp) &&
1714 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
1715 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
1716 (p->p_sigmask & sigmask(SIGTTOU)) == 0 &&
1717 p->p_pgrp->pg_jobc) {
1718 pgsignal(p->p_pgrp, SIGTTOU, 1);
1725 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0);
1719 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1726 if (error)
1727 goto out;
1728 goto loop;
1729 }
1730 /*
1731 * Process the user's data in at most OBUFSIZ chunks. Perform any
1732 * output translation. Keep track of high water mark, sleep on
1733 * overflow awaiting device aid in acquiring new space.

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1780 if (ttyoutput(*cp, tp) >= 0) {
1781 /* No Clists, wait a bit. */
1782 ttstart(tp);
1783 if (flag & IO_NDELAY) {
1784 error = EWOULDBLOCK;
1785 goto out;
1786 }
1787 error = ttysleep(tp, &lbolt,
1720 if (error)
1721 goto out;
1722 goto loop;
1723 }
1724 /*
1725 * Process the user's data in at most OBUFSIZ chunks. Perform any
1726 * output translation. Keep track of high water mark, sleep on
1727 * overflow awaiting device aid in acquiring new space.

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1774 if (ttyoutput(*cp, tp) >= 0) {
1775 /* No Clists, wait a bit. */
1776 ttstart(tp);
1777 if (flag & IO_NDELAY) {
1778 error = EWOULDBLOCK;
1779 goto out;
1780 }
1781 error = ttysleep(tp, &lbolt,
1788 TTOPRI | PCATCH, ttybuf, 0);
1782 TTOPRI|PCATCH,
1783 "ttybf1", 0);
1789 if (error)
1790 goto out;
1791 goto loop;
1792 }
1793 cp++;
1794 cc--;
1795 if (ISSET(tp->t_lflag, FLUSHO) ||
1796 tp->t_outq.c_cc > hiwat)

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1814 tp->t_outcc += ce;
1815 if (i > 0) {
1816 /* No Clists, wait a bit. */
1817 ttstart(tp);
1818 if (flag & IO_NDELAY) {
1819 error = EWOULDBLOCK;
1820 goto out;
1821 }
1784 if (error)
1785 goto out;
1786 goto loop;
1787 }
1788 cp++;
1789 cc--;
1790 if (ISSET(tp->t_lflag, FLUSHO) ||
1791 tp->t_outq.c_cc > hiwat)

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1809 tp->t_outcc += ce;
1810 if (i > 0) {
1811 /* No Clists, wait a bit. */
1812 ttstart(tp);
1813 if (flag & IO_NDELAY) {
1814 error = EWOULDBLOCK;
1815 goto out;
1816 }
1822 error = ttysleep(tp,
1823 &lbolt, TTOPRI | PCATCH, ttybuf, 0);
1817 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1818 "ttybf2", 0);
1824 if (error)
1825 goto out;
1826 goto loop;
1827 }
1828 if (ISSET(tp->t_lflag, FLUSHO) ||
1829 tp->t_outq.c_cc > hiwat)
1830 break;
1831 }

--- 466 unchanged lines hidden --- 		1819 if (error)
1820 goto out;
1821 goto loop;
1822 }
1823 if (ISSET(tp->t_lflag, FLUSHO) ||
1824 tp->t_outq.c_cc > hiwat)
1825 break;
1826 }

--- 466 unchanged lines hidden ---