full.c

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    1 /*-
    2  * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
    3  * 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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.4/sys/dev/lindev/full.c 197518 2009-09-26 12:45:28Z bz $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/conf.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 #include <sys/module.h>
   35 #include <sys/systm.h>
   36 #include <sys/uio.h>
   37 
   38 #include <dev/lindev/lindev.h>
   39 
   40 static struct cdev *full_dev;
   41 
   42 static d_read_t full_read;
   43 static d_write_t full_write;
   44 
   45 static struct cdevsw full_cdevsw = {
   46         .d_version =    D_VERSION,
   47         .d_read =       full_read,
   48         .d_write =      full_write,
   49         .d_name =       "full",
   50 };
   51 
   52 static void *zbuf;
   53 
   54 /* ARGSUSED */
   55 static int
   56 full_read(struct cdev *dev __unused, struct uio *uio, int flags __unused)
   57 {
   58         int error = 0;
   59 
   60         while (uio->uio_resid > 0 && error == 0)
   61                 error = uiomove(zbuf, MIN(uio->uio_resid, PAGE_SIZE), uio);
   62 
   63         return (error);
   64 }
   65 
   66 /* ARGSUSED */
   67 static int
   68 full_write(struct cdev *dev __unused, struct uio *uio __unused,
   69     int flags __unused)
   70 {
   71 
   72         return (ENOSPC);
   73 }
   74 
   75 /* ARGSUSED */
   76 int
   77 lindev_modevent_full(module_t mod __unused, int type, void *data __unused)
   78 {
   79 
   80         switch(type) {
   81         case MOD_LOAD:
   82                 zbuf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK | M_ZERO);
   83                 full_dev = make_dev(&full_cdevsw, 0, UID_ROOT, GID_WHEEL,
   84                     0666, "full");
   85                 if (bootverbose)
   86                         printf("full: <full device>\n");
   87                 break;
   88 
   89         case MOD_UNLOAD:
   90                 destroy_dev(full_dev);
   91                 free(zbuf, M_TEMP);
   92                 break;
   93 
   94         case MOD_SHUTDOWN:
   95                 break;
   96 
   97         default:
   98                 return (EOPNOTSUPP);
   99         }
  100 
  101         return (0);
  102 }
  103

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FreeBSD/Linux Kernel Cross Reference sys/dev/lindev/full.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/lindev/full.c