1/*-
2 * Copyright (c) 2000 Mark R. V. Murray & Jeroen C. van Gelderen
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

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18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/dev/null/null.c 111815 2003-03-03 12:15:54Z phk $
27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/conf.h>
32#include <sys/uio.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>

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46static d_read_t zero_read;
47static d_read_t null_read;
48
49#define CDEV_MAJOR 2
50#define NULL_MINOR 2
51#define ZERO_MINOR 12
52
53static struct cdevsw null_cdevsw = {
54 .d_open = nullopen,
55 .d_close = nullclose,
56 .d_read = null_read,
57 .d_write = null_write,
58 .d_ioctl = null_ioctl,
59 .d_name = "null",
60 .d_maj = CDEV_MAJOR,
61};
62
63static struct cdevsw zero_cdevsw = {
64 .d_open = nullopen,
65 .d_close = nullclose,
66 .d_read = zero_read,
67 .d_write = null_write,
68 .d_name = "zero",
69 .d_maj = CDEV_MAJOR,
70 .d_flags = D_MMAP_ANON,
71};
72
73static void *zbuf;
74
75static int
76null_read(dev_t dev __unused, struct uio *uio, int flags __unused)
77{
78

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