The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_compat.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)tty_compat.c        8.1 (Berkeley) 6/10/93
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/8.3/sys/kern/tty_compat.c 202553 2010-01-18 09:04:53Z ed $");
   34 
   35 #include "opt_compat.h"
   36 
   37 /*
   38  * mapping routines for old line discipline (yuck)
   39  */
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/ioctl_compat.h>
   44 #include <sys/tty.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 
   48 struct speedtab {
   49         int sp_speed;                   /* Speed. */
   50         int sp_code;                    /* Code. */
   51 };
   52 
   53 static int ttcompatgetflags(struct tty *tp);
   54 static void ttcompatsetflags(struct tty *tp, struct termios *t);
   55 static void ttcompatsetlflags(struct tty *tp, struct termios *t);
   56 static int ttcompatspeedtab(int speed, struct speedtab *table);
   57 
   58 static int ttydebug = 0;
   59 SYSCTL_INT(_debug, OID_AUTO, ttydebug, CTLFLAG_RW, &ttydebug, 0, "");
   60 
   61 static struct speedtab compatspeeds[] = {
   62 #define MAX_SPEED       17
   63         { 115200, 17 },
   64         { 57600, 16 },
   65         { 38400, 15 },
   66         { 19200, 14 },
   67         { 9600, 13 },
   68         { 4800, 12 },
   69         { 2400, 11 },
   70         { 1800, 10 },
   71         { 1200, 9 },
   72         { 600,  8 },
   73         { 300,  7 },
   74         { 200,  6 },
   75         { 150,  5 },
   76         { 134,  4 },
   77         { 110,  3 },
   78         { 75,   2 },
   79         { 50,   1 },
   80         { 0,    0 },
   81         { -1,   -1 },
   82 };
   83 static int compatspcodes[] = {
   84         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
   85         1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
   86 };
   87 
   88 static int
   89 ttcompatspeedtab(int speed, struct speedtab *table)
   90 {
   91         if (speed == 0)
   92                 return (0); /* hangup */
   93         for ( ; table->sp_speed > 0; table++)
   94                 if (table->sp_speed <= speed) /* nearest one, rounded down */
   95                         return (table->sp_code);
   96         return (1); /* 50, min and not hangup */
   97 }
   98 
   99 static int
  100 ttsetcompat(struct tty *tp, u_long *com, caddr_t data, struct termios *term)
  101 {
  102         switch (*com) {
  103         case TIOCSETP:
  104         case TIOCSETN: {
  105                 struct sgttyb *sg = (struct sgttyb *)data;
  106                 int speed;
  107 
  108                 if ((speed = sg->sg_ispeed) > MAX_SPEED || speed < 0)
  109                         return(EINVAL);
  110                 else if (speed != ttcompatspeedtab(tp->t_termios.c_ispeed,
  111                     compatspeeds))
  112                         term->c_ispeed = compatspcodes[speed];
  113                 else
  114                         term->c_ispeed = tp->t_termios.c_ispeed;
  115                 if ((speed = sg->sg_ospeed) > MAX_SPEED || speed < 0)
  116                         return(EINVAL);
  117                 else if (speed != ttcompatspeedtab(tp->t_termios.c_ospeed,
  118                     compatspeeds))
  119                         term->c_ospeed = compatspcodes[speed];
  120                 else
  121                         term->c_ospeed = tp->t_termios.c_ospeed;
  122                 term->c_cc[VERASE] = sg->sg_erase;
  123                 term->c_cc[VKILL] = sg->sg_kill;
  124                 tp->t_compatflags = (tp->t_compatflags&0xffff0000) |
  125                     (sg->sg_flags&0xffff);
  126                 ttcompatsetflags(tp, term);
  127                 *com = (*com == TIOCSETP) ? TIOCSETAF : TIOCSETA;
  128                 break;
  129         }
  130         case TIOCSETC: {
  131                 struct tchars *tc = (struct tchars *)data;
  132                 cc_t *cc;
  133 
  134                 cc = term->c_cc;
  135                 cc[VINTR] = tc->t_intrc;
  136                 cc[VQUIT] = tc->t_quitc;
  137                 cc[VSTART] = tc->t_startc;
  138                 cc[VSTOP] = tc->t_stopc;
  139                 cc[VEOF] = tc->t_eofc;
  140                 cc[VEOL] = tc->t_brkc;
  141                 if (tc->t_brkc == (char)_POSIX_VDISABLE)
  142                         cc[VEOL2] = _POSIX_VDISABLE;
  143                 *com = TIOCSETA;
  144                 break;
  145         }
  146         case TIOCSLTC: {
  147                 struct ltchars *ltc = (struct ltchars *)data;
  148                 cc_t *cc;
  149 
  150                 cc = term->c_cc;
  151                 cc[VSUSP] = ltc->t_suspc;
  152                 cc[VDSUSP] = ltc->t_dsuspc;
  153                 cc[VREPRINT] = ltc->t_rprntc;
  154                 cc[VDISCARD] = ltc->t_flushc;
  155                 cc[VWERASE] = ltc->t_werasc;
  156                 cc[VLNEXT] = ltc->t_lnextc;
  157                 *com = TIOCSETA;
  158                 break;
  159         }
  160         case TIOCLBIS:
  161         case TIOCLBIC:
  162         case TIOCLSET:
  163                 if (*com == TIOCLSET)
  164                         tp->t_compatflags = (tp->t_compatflags&0xffff) |
  165                             *(int *)data<<16;
  166                 else {
  167                         tp->t_compatflags = (ttcompatgetflags(tp)&0xffff0000) |
  168                             (tp->t_compatflags&0xffff);
  169                         if (*com == TIOCLBIS)
  170                                 tp->t_compatflags |= *(int *)data<<16;
  171                         else
  172                                 tp->t_compatflags &= ~(*(int *)data<<16);
  173                 }
  174                 ttcompatsetlflags(tp, term);
  175                 *com = TIOCSETA;
  176                 break;
  177         }
  178         return 0;
  179 }
  180 
  181 /*ARGSUSED*/
  182 int
  183 tty_ioctl_compat(struct tty *tp, u_long com, caddr_t data, int fflag,
  184     struct thread *td)
  185 {
  186         switch (com) {
  187         case TIOCSETP:
  188         case TIOCSETN:
  189         case TIOCSETC:
  190         case TIOCSLTC:
  191         case TIOCLBIS:
  192         case TIOCLBIC:
  193         case TIOCLSET: {
  194                 struct termios term;
  195                 int error;
  196 
  197                 term = tp->t_termios;
  198                 if ((error = ttsetcompat(tp, &com, data, &term)) != 0)
  199                         return error;
  200                 return tty_ioctl(tp, com, &term, fflag, td);
  201         }
  202         case TIOCGETP: {
  203                 struct sgttyb *sg = (struct sgttyb *)data;
  204                 cc_t *cc = tp->t_termios.c_cc;
  205 
  206                 sg->sg_ospeed = ttcompatspeedtab(tp->t_termios.c_ospeed,
  207                     compatspeeds);
  208                 if (tp->t_termios.c_ispeed == 0)
  209                         sg->sg_ispeed = sg->sg_ospeed;
  210                 else
  211                         sg->sg_ispeed = ttcompatspeedtab(tp->t_termios.c_ispeed,
  212                             compatspeeds);
  213                 sg->sg_erase = cc[VERASE];
  214                 sg->sg_kill = cc[VKILL];
  215                 sg->sg_flags = tp->t_compatflags = ttcompatgetflags(tp);
  216                 break;
  217         }
  218         case TIOCGETC: {
  219                 struct tchars *tc = (struct tchars *)data;
  220                 cc_t *cc = tp->t_termios.c_cc;
  221 
  222                 tc->t_intrc = cc[VINTR];
  223                 tc->t_quitc = cc[VQUIT];
  224                 tc->t_startc = cc[VSTART];
  225                 tc->t_stopc = cc[VSTOP];
  226                 tc->t_eofc = cc[VEOF];
  227                 tc->t_brkc = cc[VEOL];
  228                 break;
  229         }
  230         case TIOCGLTC: {
  231                 struct ltchars *ltc = (struct ltchars *)data;
  232                 cc_t *cc = tp->t_termios.c_cc;
  233 
  234                 ltc->t_suspc = cc[VSUSP];
  235                 ltc->t_dsuspc = cc[VDSUSP];
  236                 ltc->t_rprntc = cc[VREPRINT];
  237                 ltc->t_flushc = cc[VDISCARD];
  238                 ltc->t_werasc = cc[VWERASE];
  239                 ltc->t_lnextc = cc[VLNEXT];
  240                 break;
  241         }
  242         case TIOCLGET:
  243                 tp->t_compatflags =
  244                  (ttcompatgetflags(tp) & 0xffff0000UL)
  245                    | (tp->t_compatflags & 0xffff);
  246                 *(int *)data = tp->t_compatflags>>16;
  247                 if (ttydebug)
  248                         printf("CLGET: returning %x\n", *(int *)data);
  249                 break;
  250 
  251         case OTIOCGETD:
  252                 *(int *)data = 2;
  253                 break;
  254 
  255         case OTIOCSETD: {
  256                 int ldisczero = 0;
  257 
  258                 return (tty_ioctl(tp, TIOCSETD,
  259                         *(int *)data == 2 ? (caddr_t)&ldisczero : data,
  260                         fflag, td));
  261             }
  262 
  263         case OTIOCCONS:
  264                 *(int *)data = 1;
  265                 return (tty_ioctl(tp, TIOCCONS, data, fflag, td));
  266 
  267         default:
  268                 return (ENOIOCTL);
  269         }
  270         return (0);
  271 }
  272 
  273 static int
  274 ttcompatgetflags(struct tty *tp)
  275 {
  276         tcflag_t iflag  = tp->t_termios.c_iflag;
  277         tcflag_t lflag  = tp->t_termios.c_lflag;
  278         tcflag_t oflag  = tp->t_termios.c_oflag;
  279         tcflag_t cflag  = tp->t_termios.c_cflag;
  280         int flags = 0;
  281 
  282         if (iflag&IXOFF)
  283                 flags |= TANDEM;
  284         if (iflag&ICRNL || oflag&ONLCR)
  285                 flags |= CRMOD;
  286         if ((cflag&CSIZE) == CS8) {
  287                 flags |= PASS8;
  288                 if (iflag&ISTRIP)
  289                         flags |= ANYP;
  290         }
  291         else if (cflag&PARENB) {
  292                 if (iflag&INPCK) {
  293                         if (cflag&PARODD)
  294                                 flags |= ODDP;
  295                         else
  296                                 flags |= EVENP;
  297                 } else
  298                         flags |= EVENP | ODDP;
  299         }
  300 
  301         if ((lflag&ICANON) == 0) {
  302                 /* fudge */
  303                 if (iflag&(INPCK|ISTRIP|IXON) || lflag&(IEXTEN|ISIG)
  304                     || (cflag&(CSIZE|PARENB)) != CS8)
  305                         flags |= CBREAK;
  306                 else
  307                         flags |= RAW;
  308         }
  309         if (!(flags&RAW) && !(oflag&OPOST) && (cflag&(CSIZE|PARENB)) == CS8)
  310                 flags |= LITOUT;
  311         if (cflag&MDMBUF)
  312                 flags |= MDMBUF;
  313         if ((cflag&HUPCL) == 0)
  314                 flags |= NOHANG;
  315         if (oflag&TAB3)
  316                 flags |= XTABS;
  317         if (lflag&ECHOE)
  318                 flags |= CRTERA|CRTBS;
  319         if (lflag&ECHOKE)
  320                 flags |= CRTKIL|CRTBS;
  321         if (lflag&ECHOPRT)
  322                 flags |= PRTERA;
  323         if (lflag&ECHOCTL)
  324                 flags |= CTLECH;
  325         if ((iflag&IXANY) == 0)
  326                 flags |= DECCTQ;
  327         flags |= lflag&(ECHO|TOSTOP|FLUSHO|PENDIN|NOFLSH);
  328         if (ttydebug)
  329                 printf("getflags: %x\n", flags);
  330         return (flags);
  331 }
  332 
  333 static void
  334 ttcompatsetflags(struct tty *tp, struct termios *t)
  335 {
  336         int flags = tp->t_compatflags;
  337         tcflag_t iflag  = t->c_iflag;
  338         tcflag_t oflag  = t->c_oflag;
  339         tcflag_t lflag  = t->c_lflag;
  340         tcflag_t cflag  = t->c_cflag;
  341 
  342         if (flags & RAW) {
  343                 iflag = IGNBRK;
  344                 lflag &= ~(ECHOCTL|ISIG|ICANON|IEXTEN);
  345         } else {
  346                 iflag &= ~(PARMRK|IGNPAR|IGNCR|INLCR);
  347                 iflag |= BRKINT|IXON|IMAXBEL;
  348                 lflag |= ISIG|IEXTEN|ECHOCTL;   /* XXX was echoctl on ? */
  349                 if (flags & XTABS)
  350                         oflag |= TAB3;
  351                 else
  352                         oflag &= ~TAB3;
  353                 if (flags & CBREAK)
  354                         lflag &= ~ICANON;
  355                 else
  356                         lflag |= ICANON;
  357                 if (flags&CRMOD) {
  358                         iflag |= ICRNL;
  359                         oflag |= ONLCR;
  360                 } else {
  361                         iflag &= ~ICRNL;
  362                         oflag &= ~ONLCR;
  363                 }
  364         }
  365         if (flags&ECHO)
  366                 lflag |= ECHO;
  367         else
  368                 lflag &= ~ECHO;
  369 
  370         cflag &= ~(CSIZE|PARENB);
  371         if (flags&(RAW|LITOUT|PASS8)) {
  372                 cflag |= CS8;
  373                 if (!(flags&(RAW|PASS8))
  374                     || (flags&(RAW|PASS8|ANYP)) == (PASS8|ANYP))
  375                         iflag |= ISTRIP;
  376                 else
  377                         iflag &= ~ISTRIP;
  378                 if (flags&(RAW|LITOUT))
  379                         oflag &= ~OPOST;
  380                 else
  381                         oflag |= OPOST;
  382         } else {
  383                 cflag |= CS7|PARENB;
  384                 iflag |= ISTRIP;
  385                 oflag |= OPOST;
  386         }
  387         /* XXX don't set INPCK if RAW or PASS8? */
  388         if ((flags&(EVENP|ODDP)) == EVENP) {
  389                 iflag |= INPCK;
  390                 cflag &= ~PARODD;
  391         } else if ((flags&(EVENP|ODDP)) == ODDP) {
  392                 iflag |= INPCK;
  393                 cflag |= PARODD;
  394         } else
  395                 iflag &= ~INPCK;
  396         if (flags&TANDEM)
  397                 iflag |= IXOFF;
  398         else
  399                 iflag &= ~IXOFF;
  400         if ((flags&DECCTQ) == 0)
  401                 iflag |= IXANY;
  402         else
  403                 iflag &= ~IXANY;
  404         t->c_iflag = iflag;
  405         t->c_oflag = oflag;
  406         t->c_lflag = lflag;
  407         t->c_cflag = cflag;
  408 }
  409 
  410 static void
  411 ttcompatsetlflags(struct tty *tp, struct termios *t)
  412 {
  413         int flags = tp->t_compatflags;
  414         tcflag_t iflag  = t->c_iflag;
  415         tcflag_t oflag  = t->c_oflag;
  416         tcflag_t lflag  = t->c_lflag;
  417         tcflag_t cflag  = t->c_cflag;
  418 
  419         iflag &= ~(PARMRK|IGNPAR|IGNCR|INLCR);
  420         if (flags&CRTERA)
  421                 lflag |= ECHOE;
  422         else
  423                 lflag &= ~ECHOE;
  424         if (flags&CRTKIL)
  425                 lflag |= ECHOKE;
  426         else
  427                 lflag &= ~ECHOKE;
  428         if (flags&PRTERA)
  429                 lflag |= ECHOPRT;
  430         else
  431                 lflag &= ~ECHOPRT;
  432         if (flags&CTLECH)
  433                 lflag |= ECHOCTL;
  434         else
  435                 lflag &= ~ECHOCTL;
  436         if (flags&TANDEM)
  437                 iflag |= IXOFF;
  438         else
  439                 iflag &= ~IXOFF;
  440         if ((flags&DECCTQ) == 0)
  441                 iflag |= IXANY;
  442         else
  443                 iflag &= ~IXANY;
  444         if (flags & MDMBUF)
  445                 cflag |= MDMBUF;
  446         else
  447                 cflag &= ~MDMBUF;
  448         if (flags&NOHANG)
  449                 cflag &= ~HUPCL;
  450         else
  451                 cflag |= HUPCL;
  452         lflag &= ~(TOSTOP|FLUSHO|PENDIN|NOFLSH);
  453         lflag |= flags&(TOSTOP|FLUSHO|PENDIN|NOFLSH);
  454 
  455         /*
  456          * The next if-else statement is copied from above so don't bother
  457          * checking it separately.  We could avoid fiddlling with the
  458          * character size if the mode is already RAW or if neither the
  459          * LITOUT bit or the PASS8 bit is being changed, but the delta of
  460          * the change is not available here and skipping the RAW case would
  461          * make the code different from above.
  462          */
  463         cflag &= ~(CSIZE|PARENB);
  464         if (flags&(RAW|LITOUT|PASS8)) {
  465                 cflag |= CS8;
  466                 if (!(flags&(RAW|PASS8))
  467                     || (flags&(RAW|PASS8|ANYP)) == (PASS8|ANYP))
  468                         iflag |= ISTRIP;
  469                 else
  470                         iflag &= ~ISTRIP;
  471                 if (flags&(RAW|LITOUT))
  472                         oflag &= ~OPOST;
  473                 else
  474                         oflag |= OPOST;
  475         } else {
  476                 cflag |= CS7|PARENB;
  477                 iflag |= ISTRIP;
  478                 oflag |= OPOST;
  479         }
  480         t->c_iflag = iflag;
  481         t->c_oflag = oflag;
  482         t->c_lflag = lflag;
  483         t->c_cflag = cflag;
  484 }

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