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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: tty_tty.c,v 1.31 2006/11/01 10:17:59 yamt 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 1.31 2006/11/01 10:17:59 yamt 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 #include <sys/kauth.h>
   50 
   51 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
   52 
   53 /*ARGSUSED*/
   54 static int
   55 cttyopen(dev_t dev, int flag, int mode, struct lwp *l)
   56 {
   57         struct vnode *ttyvp = cttyvp(l->l_proc);
   58         int error;
   59 
   60         if (ttyvp == NULL)
   61                 return (ENXIO);
   62         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
   63 #ifdef PARANOID
   64         /*
   65          * Since group is tty and mode is 620 on most terminal lines
   66          * and since sessions protect terminals from processes outside
   67          * your session, this check is probably no longer necessary.
   68          * Since it inhibits setuid root programs that later switch
   69          * to another user from accessing /dev/tty, we have decided
   70          * to delete this test. (mckusick 5/93)
   71          */
   72         error = VOP_ACCESS(ttyvp,
   73           (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), l->l_cred, l);
   74         if (!error)
   75 #endif /* PARANOID */
   76                 error = VOP_OPEN(ttyvp, flag, NOCRED, l);
   77         VOP_UNLOCK(ttyvp, 0);
   78         return (error);
   79 }
   80 
   81 /*ARGSUSED*/
   82 static int
   83 cttyread(dev_t dev, struct uio *uio, int flag)
   84 {
   85         struct vnode *ttyvp = cttyvp(curproc);
   86         int error;
   87 
   88         if (ttyvp == NULL)
   89                 return (EIO);
   90         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
   91         error = VOP_READ(ttyvp, uio, flag, NOCRED);
   92         VOP_UNLOCK(ttyvp, 0);
   93         return (error);
   94 }
   95 
   96 /*ARGSUSED*/
   97 static int
   98 cttywrite(dev_t dev, struct uio *uio, int flag)
   99 {
  100         struct vnode *ttyvp = cttyvp(curproc);
  101         struct mount *mp;
  102         int error;
  103 
  104         if (ttyvp == NULL)
  105                 return (EIO);
  106         mp = NULL;
  107         if (ttyvp->v_type != VCHR &&
  108             (error = vn_start_write(ttyvp, &mp, V_WAIT | V_PCATCH)) != 0)
  109                 return (error);
  110         vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
  111         error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
  112         VOP_UNLOCK(ttyvp, 0);
  113         vn_finished_write(mp, 0);
  114         return (error);
  115 }
  116 
  117 /*ARGSUSED*/
  118 static int
  119 cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct lwp *l)
  120 {
  121         struct vnode *ttyvp = cttyvp(l->l_proc);
  122 
  123         if (ttyvp == NULL)
  124                 return (EIO);
  125         if (cmd == TIOCSCTTY)           /* XXX */
  126                 return (EINVAL);
  127         if (cmd == TIOCNOTTY) {
  128                 if (!SESS_LEADER(l->l_proc)) {
  129                         l->l_proc->p_flag &= ~P_CONTROLT;
  130                         return (0);
  131                 } else
  132                         return (EINVAL);
  133         }
  134         return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, l));
  135 }
  136 
  137 /*ARGSUSED*/
  138 static int
  139 cttypoll(dev_t dev, int events, struct lwp *l)
  140 {
  141         struct vnode *ttyvp = cttyvp(l->l_proc);
  142 
  143         if (ttyvp == NULL)
  144                 return (seltrue(dev, events, l));
  145         return (VOP_POLL(ttyvp, events, l));
  146 }
  147 
  148 static int
  149 cttykqfilter(dev_t dev, struct knote *kn)
  150 {
  151         /* This is called from filt_fileattach() by the attaching process. */
  152         struct proc *p = curproc;
  153         struct vnode *ttyvp = cttyvp(p);
  154 
  155         if (ttyvp == NULL)
  156                 return (1);
  157         return (VOP_KQFILTER(ttyvp, kn));
  158 }
  159 
  160 const struct cdevsw ctty_cdevsw = {
  161         cttyopen, nullclose, cttyread, cttywrite, cttyioctl,
  162         nullstop, notty, cttypoll, nommap, cttykqfilter, D_TTY
  163 };

Cache object: 50bc6e365eddc845c88bef7af553b1ee


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.