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("$FreeBSD$"); 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 40static struct cdev *full_dev; 41 42static d_read_t full_read; 43static d_write_t full_write; 44 45static 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 52static void *zbuf; 53 54/* ARGSUSED */ 55static int 56full_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 */ 67static int 68full_write(struct cdev *dev __unused, struct uio *uio __unused, 69 int flags __unused) 70{ 71 72 return (ENOSPC); 73} 74 75/* ARGSUSED */ 76int 77lindev_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} 103 104