104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
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/*-
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* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <dev/lindev/lindev.h>
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static struct cdev *full_dev;
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static d_read_t full_read;
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static d_write_t full_write;
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static struct cdevsw full_cdevsw = {
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.d_version = D_VERSION,
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.d_read = full_read,
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.d_write = full_write,
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.d_name = "full",
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};
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static void *zbuf;
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/* ARGSUSED */
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static int
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full_read(struct cdev *dev __unused, struct uio *uio, int flags __unused)
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{
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int error = 0;
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while (uio->uio_resid > 0 && error == 0)
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error = uiomove(zbuf, MIN(uio->uio_resid, PAGE_SIZE), uio);
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return (error);
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}
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/* ARGSUSED */
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static int
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full_write(struct cdev *dev __unused, struct uio *uio __unused,
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int flags __unused)
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{
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return (ENOSPC);
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}
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/* ARGSUSED */
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int
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lindev_modevent_full(module_t mod __unused, int type, void *data __unused)
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{
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switch(type) {
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case MOD_LOAD:
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zbuf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK | M_ZERO);
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full_dev = make_dev(&full_cdevsw, 0, UID_ROOT, GID_WHEEL,
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0666, "full");
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if (bootverbose)
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printf("full: <full device>\n");
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break;
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case MOD_UNLOAD:
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destroy_dev(full_dev);
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free(zbuf, M_TEMP);
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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