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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003 Poul-Henning Kamp.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: head/sys/kern/tty_tty.c 326271 2017-11-27 15:20:12Z pfg $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/conf.h>
   34 #include <sys/kernel.h>
   35 #include <sys/proc.h>
   36 #include <sys/sx.h>
   37 #include <sys/vnode.h>
   38 
   39 #include <fs/devfs/devfs.h>
   40 #include <fs/devfs/devfs_int.h>
   41 
   42 static  d_open_t        cttyopen;
   43 
   44 static struct cdevsw ctty_cdevsw = {
   45         .d_version =    D_VERSION,
   46         .d_open =       cttyopen,
   47         .d_name =       "ctty",
   48 };
   49 
   50 static struct cdev *ctty;
   51 
   52 static  int
   53 cttyopen(struct cdev *dev, int flag, int mode, struct thread *td)
   54 {
   55 
   56         return (ENXIO);
   57 }
   58 
   59 static void
   60 ctty_clone(void *arg, struct ucred *cred, char *name, int namelen,
   61     struct cdev **dev)
   62 {
   63         struct proc *p;
   64 
   65         if (*dev != NULL)
   66                 return;
   67         if (strcmp(name, "tty"))
   68                 return;
   69         p = curproc;
   70         sx_sunlock(&clone_drain_lock);
   71         sx_slock(&proctree_lock);
   72         sx_slock(&clone_drain_lock);
   73         dev_lock();
   74         if (!(p->p_flag & P_CONTROLT))
   75                 *dev = ctty;
   76         else if (p->p_session->s_ttyvp == NULL)
   77                 *dev = ctty;
   78         else if (p->p_session->s_ttyvp->v_type == VBAD ||
   79             p->p_session->s_ttyvp->v_rdev == NULL) {
   80                 /* e.g. s_ttyvp was revoked */
   81                 *dev = ctty;
   82         } else
   83                 *dev = p->p_session->s_ttyvp->v_rdev;
   84         dev_refl(*dev);
   85         dev_unlock();
   86         sx_sunlock(&proctree_lock);
   87 }
   88 
   89 static void
   90 ctty_drvinit(void *unused)
   91 {
   92 
   93         EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
   94         ctty = make_dev_credf(MAKEDEV_ETERNAL, &ctty_cdevsw, 0, NULL, UID_ROOT,
   95             GID_WHEEL, 0666, "ctty");
   96 }
   97 
   98 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ctty_drvinit,NULL);

Cache object: 297d1bca866c46522569dd3e835c38df


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