]>
Commit | Line | Data |
---|---|---|
9308f2f9 LR |
1 | /* |
2 | * proc sysctl test driver | |
3 | * | |
4 | * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or at your option any | |
9 | * later version; or, when distributed separately from the Linux kernel or | |
10 | * when incorporated into other software packages, subject to the following | |
11 | * license: | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of copyleft-next (version 0.3.1 or later) as published | |
15 | * at http://copyleft-next.org/. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * This module provides an interface to the the proc sysctl interfaces. This | |
20 | * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the | |
21 | * system unless explicitly requested by name. You can also build this driver | |
22 | * into your kernel. | |
23 | */ | |
24 | ||
25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
26 | ||
27 | #include <linux/init.h> | |
28 | #include <linux/list.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/printk.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/miscdevice.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/uaccess.h> | |
35 | #include <linux/async.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/vmalloc.h> | |
38 | ||
39 | static int i_zero; | |
40 | static int i_one_hundred = 100; | |
41 | ||
42 | struct test_sysctl_data { | |
43 | int int_0001; | |
eb965eda LR |
44 | int int_0002; |
45 | ||
9308f2f9 LR |
46 | char string_0001[65]; |
47 | }; | |
48 | ||
49 | static struct test_sysctl_data test_data = { | |
50 | .int_0001 = 60, | |
eb965eda LR |
51 | .int_0002 = 1, |
52 | ||
9308f2f9 LR |
53 | .string_0001 = "(none)", |
54 | }; | |
55 | ||
56 | /* These are all under /proc/sys/debug/test_sysctl/ */ | |
57 | static struct ctl_table test_table[] = { | |
58 | { | |
59 | .procname = "int_0001", | |
60 | .data = &test_data.int_0001, | |
61 | .maxlen = sizeof(int), | |
62 | .mode = 0644, | |
63 | .proc_handler = proc_dointvec_minmax, | |
64 | .extra1 = &i_zero, | |
65 | .extra2 = &i_one_hundred, | |
66 | }, | |
eb965eda LR |
67 | { |
68 | .procname = "int_0002", | |
69 | .data = &test_data.int_0002, | |
70 | .maxlen = sizeof(int), | |
71 | .mode = 0644, | |
72 | .proc_handler = proc_dointvec, | |
73 | }, | |
9308f2f9 LR |
74 | { |
75 | .procname = "string_0001", | |
76 | .data = &test_data.string_0001, | |
77 | .maxlen = sizeof(test_data.string_0001), | |
78 | .mode = 0644, | |
79 | .proc_handler = proc_dostring, | |
80 | }, | |
81 | { } | |
82 | }; | |
83 | ||
84 | static struct ctl_table test_sysctl_table[] = { | |
85 | { | |
86 | .procname = "test_sysctl", | |
87 | .maxlen = 0, | |
88 | .mode = 0555, | |
89 | .child = test_table, | |
90 | }, | |
91 | { } | |
92 | }; | |
93 | ||
94 | static struct ctl_table test_sysctl_root_table[] = { | |
95 | { | |
96 | .procname = "debug", | |
97 | .maxlen = 0, | |
98 | .mode = 0555, | |
99 | .child = test_sysctl_table, | |
100 | }, | |
101 | { } | |
102 | }; | |
103 | ||
104 | static struct ctl_table_header *test_sysctl_header; | |
105 | ||
106 | static int __init test_sysctl_init(void) | |
107 | { | |
108 | test_sysctl_header = register_sysctl_table(test_sysctl_root_table); | |
109 | if (!test_sysctl_header) | |
110 | return -ENOMEM; | |
111 | return 0; | |
112 | } | |
113 | late_initcall(test_sysctl_init); | |
114 | ||
115 | static void __exit test_sysctl_exit(void) | |
116 | { | |
117 | if (test_sysctl_header) | |
118 | unregister_sysctl_table(test_sysctl_header); | |
119 | } | |
120 | ||
121 | module_exit(test_sysctl_exit); | |
122 | ||
123 | MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); | |
124 | MODULE_LICENSE("GPL"); |