k_helper2.c revision 272343 
1/*	$NetBSD: k_helper2.c,v 1.2 2010/11/03 16:10:23 christos Exp $ */
2/*
3 * Copyright (c) 2010 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
16 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
22 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
24 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: k_helper2.c,v 1.2 2010/11/03 16:10:23 christos Exp $");
31
32#include <sys/param.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/sysctl.h>
36
37#include <prop/proplib.h>
38
39MODULE(MODULE_CLASS_MISC, k_helper2, NULL);
40
41/* --------------------------------------------------------------------- */
42/* Sysctl interface to query information about the module.               */
43/* --------------------------------------------------------------------- */
44
45/* TODO: Change the integer variables below that represent booleans to
46 * bools, once sysctl(8) supports CTLTYPE_BOOL nodes. */
47
48static struct sysctllog *clogp;
49static int present = 1;
50
51#define K_HELPER2 0x23456781
52#define K_HELPER_PRESENT 0
53
54SYSCTL_SETUP(sysctl_k_helper2_setup, "sysctl k_helper subtree setup")
55{
56
57	sysctl_createv(clog, 0, NULL, NULL,
58	               CTLFLAG_PERMANENT,
59	               CTLTYPE_NODE, "k_helper2", NULL,
60	               NULL, 0, NULL, 0,
61	               CTL_VENDOR, K_HELPER2, CTL_EOL);
62
63	sysctl_createv(clog, 0, NULL, NULL,
64	               CTLFLAG_PERMANENT,
65	               CTLTYPE_INT, "present",
66		       SYSCTL_DESCR("Whether the module was loaded or not"),
67		       NULL, 0, &present, 0,
68	               CTL_VENDOR, K_HELPER2, K_HELPER_PRESENT, CTL_EOL);
69}
70
71/* --------------------------------------------------------------------- */
72/* Module management.                                                    */
73/* --------------------------------------------------------------------- */
74
75static
76int
77k_helper2_init(prop_dictionary_t props)
78{
79	sysctl_k_helper2_setup(&clogp);
80
81	return 0;
82}
83
84static
85int
86k_helper2_fini(void *arg)
87{
88
89	sysctl_teardown(&clogp);
90
91	return 0;
92}
93
94static
95int
96k_helper2_modcmd(modcmd_t cmd, void *arg)
97{
98	int ret;
99
100	switch (cmd) {
101	case MODULE_CMD_INIT:
102		ret = k_helper2_init(arg);
103		break;
104
105	case MODULE_CMD_FINI:
106		ret = k_helper2_fini(arg);
107		break;
108
109	case MODULE_CMD_STAT:
110	default:
111		ret = ENOTTY;
112	}
113
114	return ret;
115}
116