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_tty.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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)tty_tty.c   8.2 (Berkeley) 9/23/93
   34  * $FreeBSD: src/sys/kern/tty_tty.c,v 1.11.4.1 1999/09/05 08:15:31 peter Exp $
   35  */
   36 
   37 /*
   38  * Indirect driver for controlling tty.
   39  */
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/conf.h>
   43 #include <sys/ioctl.h>
   44 #include <sys/proc.h>
   45 #include <sys/tty.h>
   46 #include <sys/vnode.h>
   47 #include <sys/file.h>
   48 #include <sys/kernel.h>
   49 #ifdef DEVFS
   50 #include <sys/devfsext.h>
   51 #endif /*DEVFS*/
   52 
   53 static  d_open_t        cttyopen;
   54 static  d_read_t        cttyread;
   55 static  d_write_t       cttywrite;
   56 static  d_ioctl_t       cttyioctl;
   57 static  d_select_t      cttyselect;
   58 
   59 #define CDEV_MAJOR 1
   60 /* Don't make static, fdesc_vnops uses this. */
   61 struct cdevsw ctty_cdevsw = 
   62         { cttyopen,     nullclose,      cttyread,       cttywrite,      /*1*/
   63           cttyioctl,    nullstop,       nullreset,      nodevtotty,/* tty */
   64           cttyselect,   nommap,         NULL,   "ctty", NULL,   -1 };
   65 
   66 
   67 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
   68 
   69 /*ARGSUSED*/
   70 static  int
   71 cttyopen(dev, flag, mode, p)
   72         dev_t dev;
   73         int flag, mode;
   74         struct proc *p;
   75 {
   76         struct vnode *ttyvp = cttyvp(p);
   77         int error;
   78 
   79         if (ttyvp == NULL)
   80                 return (ENXIO);
   81         VOP_LOCK(ttyvp);
   82 #ifdef PARANOID
   83         /*
   84          * Since group is tty and mode is 620 on most terminal lines
   85          * and since sessions protect terminals from processes outside
   86          * your session, this check is probably no longer necessary.
   87          * Since it inhibits setuid root programs that later switch
   88          * to another user from accessing /dev/tty, we have decided
   89          * to delete this test. (mckusick 5/93)
   90          */
   91         error = VOP_ACCESS(ttyvp,
   92           (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
   93         if (!error)
   94 #endif /* PARANOID */
   95                 error = VOP_OPEN(ttyvp, flag, NOCRED, p);
   96         VOP_UNLOCK(ttyvp);
   97         return (error);
   98 }
   99 
  100 /*ARGSUSED*/
  101 static  int
  102 cttyread(dev, uio, flag)
  103         dev_t dev;
  104         struct uio *uio;
  105         int flag;
  106 {
  107         register struct vnode *ttyvp = cttyvp(uio->uio_procp);
  108         int error;
  109 
  110         if (ttyvp == NULL)
  111                 return (EIO);
  112         VOP_LOCK(ttyvp);
  113         error = VOP_READ(ttyvp, uio, flag, NOCRED);
  114         VOP_UNLOCK(ttyvp);
  115         return (error);
  116 }
  117 
  118 /*ARGSUSED*/
  119 static  int
  120 cttywrite(dev, uio, flag)
  121         dev_t dev;
  122         struct uio *uio;
  123         int flag;
  124 {
  125         register struct vnode *ttyvp = cttyvp(uio->uio_procp);
  126         int error;
  127 
  128         if (ttyvp == NULL)
  129                 return (EIO);
  130         VOP_LOCK(ttyvp);
  131         error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
  132         VOP_UNLOCK(ttyvp);
  133         return (error);
  134 }
  135 
  136 /*ARGSUSED*/
  137 static  int
  138 cttyioctl(dev, cmd, addr, flag, p)
  139         dev_t dev;
  140         int cmd;
  141         caddr_t addr;
  142         int flag;
  143         struct proc *p;
  144 {
  145         struct vnode *ttyvp = cttyvp(p);
  146 
  147         if (ttyvp == NULL)
  148                 return (EIO);
  149         if (cmd == TIOCSCTTY)  /* don't allow controlling tty to be set    */
  150                 return EINVAL; /* to controlling tty -- infinite recursion */
  151         if (cmd == TIOCNOTTY) {
  152                 if (!SESS_LEADER(p)) {
  153                         p->p_flag &= ~P_CONTROLT;
  154                         return (0);
  155                 } else
  156                         return (EINVAL);
  157         }
  158         return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
  159 }
  160 
  161 /*ARGSUSED*/
  162 static  int
  163 cttyselect(dev, flag, p)
  164         dev_t dev;
  165         int flag;
  166         struct proc *p;
  167 {
  168         struct vnode *ttyvp = cttyvp(p);
  169 
  170         if (ttyvp == NULL)
  171                 return (1);     /* try operation to get EOF/failure */
  172         return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
  173 }
  174 
  175 static ctty_devsw_installed = 0;
  176 #ifdef DEVFS
  177 static  void    *ctty_devfs_token;
  178 #endif
  179 
  180 static void
  181 ctty_drvinit(void *unused)
  182 {
  183         dev_t dev;
  184 
  185         if( ! ctty_devsw_installed ) {
  186                 dev = makedev(CDEV_MAJOR,0);
  187                 cdevsw_add(&dev,&ctty_cdevsw,NULL);
  188                 ctty_devsw_installed = 1;
  189 #ifdef DEVFS
  190                 ctty_devfs_token = 
  191                         devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 
  192                                         0666, "tty");
  193 #endif
  194         }
  195 }
  196 
  197 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
  198 
  199 

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