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 /*      $NetBSD: tty_tty.c,v 1.24 2005/02/26 21:34:55 perry Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1991, 1993, 1995
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tty_tty.c   8.2 (Berkeley) 9/23/93
   32  */
   33 
   34 /*
   35  * Indirect driver for controlling tty.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __KERNEL_RCSID(0, "$NetBSD: tty_tty.c,v 1.24 2005/02/26 21:34:55 perry Exp $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.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/conf.h>
   49 
   50 
   51 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
   52 
   53 dev_type_open(cttyopen);
   54 dev_type_read(cttyread);
   55 dev_type_write(cttywrite);
   56 dev_type_ioctl(cttyioctl);
   57 dev_type_poll(cttypoll);
   58 dev_type_kqfilter(cttykqfilter);
   59 
   60 const struct cdevsw ctty_cdevsw = {
   61         cttyopen, nullclose, cttyread, cttywrite, cttyioctl,
   62         nullstop, notty, cttypoll, nommap, cttykqfilter, D_TTY
   63 };
   64 
   65 /*ARGSUSED*/
   66 int
   67 cttyopen(dev, flag, mode, p)
   68         dev_t dev;
   69         int flag, mode;
   70         struct proc *p;
   71 {
   72         struct vnode *ttyvp = cttyvp(p);
   73         int error;
   74 
   75         if (ttyvp == NULL)
   76                 return (ENXIO);
   77         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
   78 #ifdef PARANOID
   79         /*
   80          * Since group is tty and mode is 620 on most terminal lines
   81          * and since sessions protect terminals from processes outside
   82          * your session, this check is probably no longer necessary.
   83          * Since it inhibits setuid root programs that later switch
   84          * to another user from accessing /dev/tty, we have decided
   85          * to delete this test. (mckusick 5/93)
   86          */
   87         error = VOP_ACCESS(ttyvp,
   88           (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
   89         if (!error)
   90 #endif /* PARANOID */
   91                 error = VOP_OPEN(ttyvp, flag, NOCRED, p);
   92         VOP_UNLOCK(ttyvp, 0);
   93         return (error);
   94 }
   95 
   96 /*ARGSUSED*/
   97 int
   98 cttyread(dev, uio, flag)
   99         dev_t dev;
  100         struct uio *uio;
  101         int flag;
  102 {
  103         struct vnode *ttyvp = cttyvp(uio->uio_procp);
  104         int error;
  105 
  106         if (ttyvp == NULL)
  107                 return (EIO);
  108         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
  109         error = VOP_READ(ttyvp, uio, flag, NOCRED);
  110         VOP_UNLOCK(ttyvp, 0);
  111         return (error);
  112 }
  113 
  114 /*ARGSUSED*/
  115 int
  116 cttywrite(dev, uio, flag)
  117         dev_t dev;
  118         struct uio *uio;
  119         int flag;
  120 {
  121         struct vnode *ttyvp = cttyvp(uio->uio_procp);
  122         struct mount *mp;
  123         int error;
  124 
  125         if (ttyvp == NULL)
  126                 return (EIO);
  127         mp = NULL;
  128         if (ttyvp->v_type != VCHR &&
  129             (error = vn_start_write(ttyvp, &mp, V_WAIT | V_PCATCH)) != 0)
  130                 return (error);
  131         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
  132         error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
  133         VOP_UNLOCK(ttyvp, 0);
  134         vn_finished_write(mp, 0);
  135         return (error);
  136 }
  137 
  138 /*ARGSUSED*/
  139 int
  140 cttyioctl(dev, cmd, addr, flag, p)
  141         dev_t dev;
  142         u_long cmd;
  143         caddr_t addr;
  144         int flag;
  145         struct proc *p;
  146 {
  147         struct vnode *ttyvp = cttyvp(p);
  148 
  149         if (ttyvp == NULL)
  150                 return (EIO);
  151         if (cmd == TIOCSCTTY)           /* XXX */
  152                 return (EINVAL);
  153         if (cmd == TIOCNOTTY) {
  154                 if (!SESS_LEADER(p)) {
  155                         p->p_flag &= ~P_CONTROLT;
  156                         return (0);
  157                 } else
  158                         return (EINVAL);
  159         }
  160         return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
  161 }
  162 
  163 /*ARGSUSED*/
  164 int
  165 cttypoll(dev, events, p)
  166         dev_t dev;
  167         int events;
  168         struct proc *p;
  169 {
  170         struct vnode *ttyvp = cttyvp(p);
  171 
  172         if (ttyvp == NULL)
  173                 return (seltrue(dev, events, p));
  174         return (VOP_POLL(ttyvp, events, p));
  175 }
  176 
  177 int
  178 cttykqfilter(dev, kn)
  179         dev_t dev;
  180         struct knote *kn;
  181 {
  182         /* This is called from filt_fileattach() by the attaching process. */
  183         struct proc *p = curproc;
  184         struct vnode *ttyvp = cttyvp(p);
  185 
  186         if (ttyvp == NULL)
  187                 return (1);
  188         return (VOP_KQFILTER(ttyvp, kn));
  189 }

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