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) 2003 Poul-Henning Kamp.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD: releng/5.1/sys/kern/tty_tty.c 111815 2003-03-03 12:15:54Z phk $
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/conf.h>
   31 #include <sys/kernel.h>
   32 #include <sys/proc.h>
   33 #include <sys/vnode.h>
   34 
   35 static  d_open_t        cttyopen;
   36 
   37 #define CDEV_MAJOR      1
   38 
   39 static struct cdevsw ctty_cdevsw = {
   40         .d_open =       cttyopen,
   41         .d_close =      nullclose,
   42         .d_name =       "ctty",
   43         .d_maj =        CDEV_MAJOR,
   44         .d_flags =      D_TTY,
   45 };
   46 
   47 static dev_t ctty;
   48 
   49 static  int
   50 cttyopen(dev_t dev, int flag, int mode, struct thread *td)
   51 {
   52 
   53         return (ENXIO);
   54 }
   55 
   56 static void
   57 ctty_clone(void *arg, char *name, int namelen, dev_t *dev)
   58 {
   59 
   60         if (*dev != NODEV)
   61                 return;
   62         if (strcmp(name, "tty"))
   63                 return;
   64         if (!(curthread->td_proc->p_flag & P_CONTROLT))
   65                 *dev = ctty;
   66         else if (curthread->td_proc->p_session->s_ttyvp == NULL)
   67                 *dev = ctty;
   68         else
   69                 *dev = curthread->td_proc->p_session->s_ttyvp->v_rdev;
   70 }
   71 
   72 static void
   73 ctty_drvinit(void *unused)
   74 {
   75 
   76         EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
   77         ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty");
   78 }
   79 
   80 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)

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