1 /* $NetBSD: example.c,v 1.3 2008/04/28 20:24:09 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: example.c,v 1.3 2008/04/28 20:24:09 martin Exp $");
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35
36 MODULE(MODULE_CLASS_MISC, example, NULL);
37
38 static
39 void
40 handle_props(prop_dictionary_t props)
41 {
42 prop_string_t str;
43
44 str = prop_dictionary_get(props, "msg");
45 if (str == NULL)
46 printf("The 'msg' property was not given.\n");
47 else if (prop_object_type(str) != PROP_TYPE_STRING)
48 printf("The 'msg' property is not a string.\n");
49 else {
50 const char *msg = prop_string_cstring_nocopy(str);
51 if (msg == NULL)
52 printf("Failed to process the 'msg' property.\n");
53 else
54 printf("The 'msg' property is: %s\n", msg);
55 }
56 }
57
58 static int
59 example_modcmd(modcmd_t cmd, void *arg)
60 {
61
62 switch (cmd) {
63 case MODULE_CMD_INIT:
64 printf("Example module loaded.\n");
65 handle_props(arg);
66 break;
67
68 case MODULE_CMD_FINI:
69 printf("Example module unloaded.\n");
70 break;
71
72 case MODULE_CMD_STAT:
73 printf("Example module status queried.\n");
74 return ENOTTY;
75
76 default:
77 return ENOTTY;
78 }
79
80 return 0;
81 }
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