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("$FreeBSD$");
   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 static int ttcompatgetflags(struct tty *tp);
   49 static void ttcompatsetflags(struct tty *tp, struct termios *t);
   50 static void ttcompatsetlflags(struct tty *tp, struct termios *t);
   51 static int ttcompatspeedtab(int speed, struct speedtab *table);
   52 
   53 static int ttydebug = 0;
   54 SYSCTL_INT(_debug, OID_AUTO, ttydebug, CTLFLAG_RW, &ttydebug, 0, "");
   55 
   56 static struct speedtab compatspeeds[] = {
   57 #define MAX_SPEED       17
   58         { 115200, 17 },
   59         { 57600, 16 },
   60         { 38400, 15 },
   61         { 19200, 14 },
   62         { 9600, 13 },
   63         { 4800, 12 },
   64         { 2400, 11 },
   65         { 1800, 10 },
   66         { 1200, 9 },
   67         { 600,  8 },
   68         { 300,  7 },
   69         { 200,  6 },
   70         { 150,  5 },
   71         { 134,  4 },
   72         { 110,  3 },
   73         { 75,   2 },
   74         { 50,   1 },
   75         { 0,    0 },
   76         { -1,   -1 },
   77 };
   78 static int compatspcodes[] = {
   79         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
   80         1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
   81 };
   82 
   83 static int
   84 ttcompatspeedtab(int speed, struct speedtab *table)
   85 {
   86         if (speed == 0)
   87                 return (0); /* hangup */
   88         for ( ; table->sp_speed > 0; table++)
   89                 if (table->sp_speed <= speed) /* nearest one, rounded down */
   90                         return (table->sp_code);
   91         return (1); /* 50, min and not hangup */
   92 }
   93 
   94 static int
   95 ttsetcompat(struct tty *tp, u_long *com, caddr_t data, struct termios *term)
   96 {
   97         switch (*com) {
   98         case TIOCSETP:
   99         case TIOCSETN: {
  100                 struct sgttyb *sg = (struct sgttyb *)data;
  101                 int speed;
  102 
  103                 if ((speed = sg->sg_ispeed) > MAX_SPEED || speed < 0)
  104                         return(EINVAL);
  105                 else if (speed != ttcompatspeedtab(tp->t_ispeed, compatspeeds))
  106                         term->c_ispeed = compatspcodes[speed];
  107                 else
  108                         term->c_ispeed = tp->t_ispeed;
  109                 if ((speed = sg->sg_ospeed) > MAX_SPEED || speed < 0)
  110                         return(EINVAL);
  111                 else if (speed != ttcompatspeedtab(tp->t_ospeed, compatspeeds))
  112                         term->c_ospeed = compatspcodes[speed];
  113                 else
  114                         term->c_ospeed = tp->t_ospeed;
  115                 term->c_cc[VERASE] = sg->sg_erase;
  116                 term->c_cc[VKILL] = sg->sg_kill;
  117                 tp->t_flags = (tp->t_flags&0xffff0000) | (sg->sg_flags&0xffff);
  118                 ttcompatsetflags(tp, term);
  119                 *com = (*com == TIOCSETP) ? TIOCSETAF : TIOCSETA;
  120                 break;
  121         }
  122         case TIOCSETC: {
  123                 struct tchars *tc = (struct tchars *)data;
  124                 cc_t *cc;
  125 
  126                 cc = term->c_cc;
  127                 cc[VINTR] = tc->t_intrc;
  128                 cc[VQUIT] = tc->t_quitc;
  129                 cc[VSTART] = tc->t_startc;
  130                 cc[VSTOP] = tc->t_stopc;
  131                 cc[VEOF] = tc->t_eofc;
  132                 cc[VEOL] = tc->t_brkc;
  133                 if (tc->t_brkc == (char)_POSIX_VDISABLE)
  134                         cc[VEOL2] = _POSIX_VDISABLE;
  135                 *com = TIOCSETA;
  136                 break;
  137         }
  138         case TIOCSLTC: {
  139                 struct ltchars *ltc = (struct ltchars *)data;
  140                 cc_t *cc;
  141 
  142                 cc = term->c_cc;
  143                 cc[VSUSP] = ltc->t_suspc;
  144                 cc[VDSUSP] = ltc->t_dsuspc;
  145                 cc[VREPRINT] = ltc->t_rprntc;
  146                 cc[VDISCARD] = ltc->t_flushc;
  147                 cc[VWERASE] = ltc->t_werasc;
  148                 cc[VLNEXT] = ltc->t_lnextc;
  149                 *com = TIOCSETA;
  150                 break;
  151         }
  152         case TIOCLBIS:
  153         case TIOCLBIC:
  154         case TIOCLSET:
  155                 if (*com == TIOCLSET)
  156                         tp->t_flags = (tp->t_flags&0xffff) | *(int *)data<<16;
  157                 else {
  158                         tp->t_flags =
  159                          (ttcompatgetflags(tp)&0xffff0000)|(tp->t_flags&0xffff);
  160                         if (*com == TIOCLBIS)
  161                                 tp->t_flags |= *(int *)data<<16;
  162                         else
  163                                 tp->t_flags &= ~(*(int *)data<<16);
  164                 }
  165                 ttcompatsetlflags(tp, term);
  166                 *com = TIOCSETA;
  167                 break;
  168         }
  169         return 0;
  170 }
  171 
  172 /*ARGSUSED*/
  173 int
  174 ttcompat(struct tty *tp, u_long com, caddr_t data, int flag)
  175 {
  176         switch (com) {
  177         case TIOCSETP:
  178         case TIOCSETN:
  179         case TIOCSETC:
  180         case TIOCSLTC:
  181         case TIOCLBIS:
  182         case TIOCLBIC:
  183         case TIOCLSET: {
  184                 struct termios term;
  185                 int error;
  186 
  187                 term = tp->t_termios;
  188                 if ((error = ttsetcompat(tp, &com, data, &term)) != 0)
  189                         return error;
  190                 return ttioctl(tp, com, &term, flag);
  191         }
  192         case TIOCGETP: {
  193                 struct sgttyb *sg = (struct sgttyb *)data;
  194                 cc_t *cc = tp->t_cc;
  195 
  196                 sg->sg_ospeed = ttcompatspeedtab(tp->t_ospeed, compatspeeds);
  197                 if (tp->t_ispeed == 0)
  198                         sg->sg_ispeed = sg->sg_ospeed;
  199                 else
  200                         sg->sg_ispeed = ttcompatspeedtab(tp->t_ispeed, compatspeeds);
  201                 sg->sg_erase = cc[VERASE];
  202                 sg->sg_kill = cc[VKILL];
  203                 sg->sg_flags = tp->t_flags = ttcompatgetflags(tp);
  204                 break;
  205         }
  206         case TIOCGETC: {
  207                 struct tchars *tc = (struct tchars *)data;
  208                 cc_t *cc = tp->t_cc;
  209 
  210                 tc->t_intrc = cc[VINTR];
  211                 tc->t_quitc = cc[VQUIT];
  212                 tc->t_startc = cc[VSTART];
  213                 tc->t_stopc = cc[VSTOP];
  214                 tc->t_eofc = cc[VEOF];
  215                 tc->t_brkc = cc[VEOL];
  216                 break;
  217         }
  218         case TIOCGLTC: {
  219                 struct ltchars *ltc = (struct ltchars *)data;
  220                 cc_t *cc = tp->t_cc;
  221 
  222                 ltc->t_suspc = cc[VSUSP];
  223                 ltc->t_dsuspc = cc[VDSUSP];
  224                 ltc->t_rprntc = cc[VREPRINT];
  225                 ltc->t_flushc = cc[VDISCARD];
  226                 ltc->t_werasc = cc[VWERASE];
  227                 ltc->t_lnextc = cc[VLNEXT];
  228                 break;
  229         }
  230         case TIOCLGET:
  231                 tp->t_flags =
  232                  (ttcompatgetflags(tp) & 0xffff0000UL)
  233                    | (tp->t_flags & 0xffff);
  234                 *(int *)data = tp->t_flags>>16;
  235                 if (ttydebug)
  236                         printf("CLGET: returning %x\n", *(int *)data);
  237                 break;
  238 
  239         case OTIOCGETD:
  240                 *(int *)data = tp->t_line ? tp->t_line : 2;
  241                 break;
  242 
  243         case OTIOCSETD: {
  244                 int ldisczero = 0;
  245 
  246                 return (ttioctl(tp, TIOCSETD,
  247                         *(int *)data == 2 ? (caddr_t)&ldisczero : data, flag));
  248             }
  249 
  250         case OTIOCCONS:
  251                 *(int *)data = 1;
  252                 return (ttioctl(tp, TIOCCONS, data, flag));
  253 
  254         default:
  255                 return (ENOIOCTL);
  256         }
  257         return (0);
  258 }
  259 
  260 static int
  261 ttcompatgetflags(struct tty *tp)
  262 {
  263         tcflag_t iflag  = tp->t_iflag;
  264         tcflag_t lflag  = tp->t_lflag;
  265         tcflag_t oflag  = tp->t_oflag;
  266         tcflag_t cflag  = tp->t_cflag;
  267         int flags = 0;
  268 
  269         if (iflag&IXOFF)
  270                 flags |= TANDEM;
  271         if (iflag&ICRNL || oflag&ONLCR)
  272                 flags |= CRMOD;
  273         if ((cflag&CSIZE) == CS8) {
  274                 flags |= PASS8;
  275                 if (iflag&ISTRIP)
  276                         flags |= ANYP;
  277         }
  278         else if (cflag&PARENB) {
  279                 if (iflag&INPCK) {
  280                         if (cflag&PARODD)
  281                                 flags |= ODDP;
  282                         else
  283                                 flags |= EVENP;
  284                 } else
  285                         flags |= EVENP | ODDP;
  286         }
  287 
  288         if ((lflag&ICANON) == 0) {
  289                 /* fudge */
  290                 if (iflag&(INPCK|ISTRIP|IXON) || lflag&(IEXTEN|ISIG)
  291                     || (cflag&(CSIZE|PARENB)) != CS8)
  292                         flags |= CBREAK;
  293                 else
  294                         flags |= RAW;
  295         }
  296         if (!(flags&RAW) && !(oflag&OPOST) && (cflag&(CSIZE|PARENB)) == CS8)
  297                 flags |= LITOUT;
  298         if (cflag&MDMBUF)
  299                 flags |= MDMBUF;
  300         if ((cflag&HUPCL) == 0)
  301                 flags |= NOHANG;
  302         if (oflag&OXTABS)
  303                 flags |= XTABS;
  304         if (lflag&ECHOE)
  305                 flags |= CRTERA|CRTBS;
  306         if (lflag&ECHOKE)
  307                 flags |= CRTKIL|CRTBS;
  308         if (lflag&ECHOPRT)
  309                 flags |= PRTERA;
  310         if (lflag&ECHOCTL)
  311                 flags |= CTLECH;
  312         if ((iflag&IXANY) == 0)
  313                 flags |= DECCTQ;
  314         flags |= lflag&(ECHO|TOSTOP|FLUSHO|PENDIN|NOFLSH);
  315         if (ttydebug)
  316                 printf("getflags: %x\n", flags);
  317         return (flags);
  318 }
  319 
  320 static void
  321 ttcompatsetflags(struct tty *tp, struct termios *t)
  322 {
  323         int flags = tp->t_flags;
  324         tcflag_t iflag  = t->c_iflag;
  325         tcflag_t oflag  = t->c_oflag;
  326         tcflag_t lflag  = t->c_lflag;
  327         tcflag_t cflag  = t->c_cflag;
  328 
  329         if (flags & RAW) {
  330                 iflag = IGNBRK;
  331                 lflag &= ~(ECHOCTL|ISIG|ICANON|IEXTEN);
  332         } else {
  333                 iflag &= ~(PARMRK|IGNPAR|IGNCR|INLCR);
  334                 iflag |= BRKINT|IXON|IMAXBEL;
  335                 lflag |= ISIG|IEXTEN|ECHOCTL;   /* XXX was echoctl on ? */
  336                 if (flags & XTABS)
  337                         oflag |= OXTABS;
  338                 else
  339                         oflag &= ~OXTABS;
  340                 if (flags & CBREAK)
  341                         lflag &= ~ICANON;
  342                 else
  343                         lflag |= ICANON;
  344                 if (flags&CRMOD) {
  345                         iflag |= ICRNL;
  346                         oflag |= ONLCR;
  347                 } else {
  348                         iflag &= ~ICRNL;
  349                         oflag &= ~ONLCR;
  350                 }
  351         }
  352         if (flags&ECHO)
  353                 lflag |= ECHO;
  354         else
  355                 lflag &= ~ECHO;
  356 
  357         cflag &= ~(CSIZE|PARENB);
  358         if (flags&(RAW|LITOUT|PASS8)) {
  359                 cflag |= CS8;
  360                 if (!(flags&(RAW|PASS8))
  361                     || (flags&(RAW|PASS8|ANYP)) == (PASS8|ANYP))
  362                         iflag |= ISTRIP;
  363                 else
  364                         iflag &= ~ISTRIP;
  365                 if (flags&(RAW|LITOUT))
  366                         oflag &= ~OPOST;
  367                 else
  368                         oflag |= OPOST;
  369         } else {
  370                 cflag |= CS7|PARENB;
  371                 iflag |= ISTRIP;
  372                 oflag |= OPOST;
  373         }
  374         /* XXX don't set INPCK if RAW or PASS8? */
  375         if ((flags&(EVENP|ODDP)) == EVENP) {
  376                 iflag |= INPCK;
  377                 cflag &= ~PARODD;
  378         } else if ((flags&(EVENP|ODDP)) == ODDP) {
  379                 iflag |= INPCK;
  380                 cflag |= PARODD;
  381         } else
  382                 iflag &= ~INPCK;
  383         if (flags&TANDEM)
  384                 iflag |= IXOFF;
  385         else
  386                 iflag &= ~IXOFF;
  387         if ((flags&DECCTQ) == 0)
  388                 iflag |= IXANY;
  389         else
  390                 iflag &= ~IXANY;
  391         t->c_iflag = iflag;
  392         t->c_oflag = oflag;
  393         t->c_lflag = lflag;
  394         t->c_cflag = cflag;
  395 }
  396 
  397 static void
  398 ttcompatsetlflags(struct tty *tp, struct termios *t)
  399 {
  400         int flags = tp->t_flags;
  401         tcflag_t iflag  = t->c_iflag;
  402         tcflag_t oflag  = t->c_oflag;
  403         tcflag_t lflag  = t->c_lflag;
  404         tcflag_t cflag  = t->c_cflag;
  405 
  406         iflag &= ~(PARMRK|IGNPAR|IGNCR|INLCR);
  407         if (flags&CRTERA)
  408                 lflag |= ECHOE;
  409         else
  410                 lflag &= ~ECHOE;
  411         if (flags&CRTKIL)
  412                 lflag |= ECHOKE;
  413         else
  414                 lflag &= ~ECHOKE;
  415         if (flags&PRTERA)
  416                 lflag |= ECHOPRT;
  417         else
  418                 lflag &= ~ECHOPRT;
  419         if (flags&CTLECH)
  420                 lflag |= ECHOCTL;
  421         else
  422                 lflag &= ~ECHOCTL;
  423         if (flags&TANDEM)
  424                 iflag |= IXOFF;
  425         else
  426                 iflag &= ~IXOFF;
  427         if ((flags&DECCTQ) == 0)
  428                 iflag |= IXANY;
  429         else
  430                 iflag &= ~IXANY;
  431         if (flags & MDMBUF)
  432                 cflag |= MDMBUF;
  433         else
  434                 cflag &= ~MDMBUF;
  435         if (flags&NOHANG)
  436                 cflag &= ~HUPCL;
  437         else
  438                 cflag |= HUPCL;
  439         lflag &= ~(TOSTOP|FLUSHO|PENDIN|NOFLSH);
  440         lflag |= flags&(TOSTOP|FLUSHO|PENDIN|NOFLSH);
  441 
  442         /*
  443          * The next if-else statement is copied from above so don't bother
  444          * checking it separately.  We could avoid fiddlling with the
  445          * character size if the mode is already RAW or if neither the
  446          * LITOUT bit or the PASS8 bit is being changed, but the delta of
  447          * the change is not available here and skipping the RAW case would
  448          * make the code different from above.
  449          */
  450         cflag &= ~(CSIZE|PARENB);
  451         if (flags&(RAW|LITOUT|PASS8)) {
  452                 cflag |= CS8;
  453                 if (!(flags&(RAW|PASS8))
  454                     || (flags&(RAW|PASS8|ANYP)) == (PASS8|ANYP))
  455                         iflag |= ISTRIP;
  456                 else
  457                         iflag &= ~ISTRIP;
  458                 if (flags&(RAW|LITOUT))
  459                         oflag &= ~OPOST;
  460                 else
  461                         oflag |= OPOST;
  462         } else {
  463                 cflag |= CS7|PARENB;
  464                 iflag |= ISTRIP;
  465                 oflag |= OPOST;
  466         }
  467         t->c_iflag = iflag;
  468         t->c_oflag = oflag;
  469         t->c_lflag = lflag;
  470         t->c_cflag = cflag;
  471 }

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