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: stable/3/sys/kern/tty_tty.c 50583 1999-08-29 16:33:42Z peter $
   35  */
   36 
   37 /*
   38  * Indirect driver for controlling tty.
   39  */
   40 
   41 #include "opt_devfs.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/conf.h>
   46 #include <sys/lock.h>
   47 #include <sys/proc.h>
   48 #include <sys/ttycom.h>
   49 #include <sys/vnode.h>
   50 #include <sys/kernel.h>
   51 #ifdef DEVFS
   52 #include <sys/devfsext.h>
   53 #endif /*DEVFS*/
   54 
   55 static  d_open_t        cttyopen;
   56 static  d_read_t        cttyread;
   57 static  d_write_t       cttywrite;
   58 static  d_ioctl_t       cttyioctl;
   59 static  d_poll_t        cttypoll;
   60 
   61 #define CDEV_MAJOR      1
   62 /* Don't make this static, since fdesc_vnops uses it. */
   63 struct cdevsw   ctty_cdevsw = {
   64         cttyopen,       nullclose,      cttyread,       cttywrite,
   65         cttyioctl,      nullstop,       nullreset,      nodevtotty,
   66         cttypoll,       nommap,         NULL,           "ctty",
   67         NULL,           -1,             nodump,         nopsize,
   68         D_TTY,
   69 };
   70 
   71 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
   72 
   73 /*ARGSUSED*/
   74 static  int
   75 cttyopen(dev, flag, mode, p)
   76         dev_t dev;
   77         int flag, mode;
   78         struct proc *p;
   79 {
   80         struct vnode *ttyvp = cttyvp(p);
   81         int error;
   82 
   83         if (ttyvp == NULL)
   84                 return (ENXIO);
   85         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
   86 #ifdef PARANOID
   87         /*
   88          * Since group is tty and mode is 620 on most terminal lines
   89          * and since sessions protect terminals from processes outside
   90          * your session, this check is probably no longer necessary.
   91          * Since it inhibits setuid root programs that later switch
   92          * to another user from accessing /dev/tty, we have decided
   93          * to delete this test. (mckusick 5/93)
   94          */
   95         error = VOP_ACCESS(ttyvp,
   96           (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
   97         if (!error)
   98 #endif /* PARANOID */
   99                 error = VOP_OPEN(ttyvp, flag, NOCRED, p);
  100         VOP_UNLOCK(ttyvp, 0, p);
  101         return (error);
  102 }
  103 
  104 /*ARGSUSED*/
  105 static  int
  106 cttyread(dev, uio, flag)
  107         dev_t dev;
  108         struct uio *uio;
  109         int flag;
  110 {
  111         struct proc *p = uio->uio_procp;
  112         register struct vnode *ttyvp = cttyvp(p);
  113         int error;
  114 
  115         if (ttyvp == NULL)
  116                 return (EIO);
  117         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
  118         error = VOP_READ(ttyvp, uio, flag, NOCRED);
  119         VOP_UNLOCK(ttyvp, 0, p);
  120         return (error);
  121 }
  122 
  123 /*ARGSUSED*/
  124 static  int
  125 cttywrite(dev, uio, flag)
  126         dev_t dev;
  127         struct uio *uio;
  128         int flag;
  129 {
  130         struct proc *p = uio->uio_procp;
  131         struct vnode *ttyvp = cttyvp(uio->uio_procp);
  132         int error;
  133 
  134         if (ttyvp == NULL)
  135                 return (EIO);
  136         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
  137         error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
  138         VOP_UNLOCK(ttyvp, 0, p);
  139         return (error);
  140 }
  141 
  142 /*ARGSUSED*/
  143 static  int
  144 cttyioctl(dev, cmd, addr, flag, p)
  145         dev_t dev;
  146         u_long cmd;
  147         caddr_t addr;
  148         int flag;
  149         struct proc *p;
  150 {
  151         struct vnode *ttyvp = cttyvp(p);
  152 
  153         if (ttyvp == NULL)
  154                 return (EIO);
  155         if (cmd == TIOCSCTTY)  /* don't allow controlling tty to be set    */
  156                 return EINVAL; /* to controlling tty -- infinite recursion */
  157         if (cmd == TIOCNOTTY) {
  158                 if (!SESS_LEADER(p)) {
  159                         p->p_flag &= ~P_CONTROLT;
  160                         return (0);
  161                 } else
  162                         return (EINVAL);
  163         }
  164         return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
  165 }
  166 
  167 /*ARGSUSED*/
  168 static  int
  169 cttypoll(dev, events, p)
  170         dev_t dev;
  171         int events;
  172         struct proc *p;
  173 {
  174         struct vnode *ttyvp = cttyvp(p);
  175 
  176         if (ttyvp == NULL)
  177                 /* try operation to get EOF/failure */
  178                 return (seltrue(dev, events, p));
  179         return (VOP_POLL(ttyvp, events, p->p_ucred, p));
  180 }
  181 
  182 static  int     ctty_devsw_installed;
  183 #ifdef DEVFS
  184 static  void    *ctty_devfs_token;
  185 #endif
  186 
  187 static void ctty_drvinit __P((void *unused));
  188 static void
  189 ctty_drvinit(unused)
  190         void *unused;
  191 {
  192         dev_t dev;
  193 
  194         if( ! ctty_devsw_installed ) {
  195                 dev = makedev(CDEV_MAJOR,0);
  196                 cdevsw_add(&dev,&ctty_cdevsw,NULL);
  197                 ctty_devsw_installed = 1;
  198 #ifdef DEVFS
  199                 ctty_devfs_token = 
  200                         devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 
  201                                         0666, "tty");
  202 #endif
  203         }
  204 }
  205 
  206 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)

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