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157 lines
3.6 KiB
157 lines
3.6 KiB
/* |
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* proc sysctl test driver |
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* |
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* Copyright (C) 2017 Luis R. Rodriguez <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the Free |
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* Software Foundation; either version 2 of the License, or at your option any |
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* later version; or, when distributed separately from the Linux kernel or |
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* when incorporated into other software packages, subject to the following |
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* license: |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of copyleft-next (version 0.3.1 or later) as published |
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* at http://copyleft-next.org/. |
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*/ |
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/* |
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* This module provides an interface to the proc sysctl interfaces. This |
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* driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the |
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* system unless explicitly requested by name. You can also build this driver |
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* into your kernel. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/printk.h> |
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#include <linux/fs.h> |
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#include <linux/miscdevice.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <linux/async.h> |
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#include <linux/delay.h> |
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#include <linux/vmalloc.h> |
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static int i_zero; |
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static int i_one_hundred = 100; |
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struct test_sysctl_data { |
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int int_0001; |
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int int_0002; |
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int int_0003[4]; |
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int boot_int; |
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unsigned int uint_0001; |
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char string_0001[65]; |
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#define SYSCTL_TEST_BITMAP_SIZE 65536 |
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unsigned long *bitmap_0001; |
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}; |
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static struct test_sysctl_data test_data = { |
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.int_0001 = 60, |
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.int_0002 = 1, |
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.int_0003[0] = 0, |
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.int_0003[1] = 1, |
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.int_0003[2] = 2, |
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.int_0003[3] = 3, |
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.boot_int = 0, |
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.uint_0001 = 314, |
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.string_0001 = "(none)", |
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}; |
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/* These are all under /proc/sys/debug/test_sysctl/ */ |
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static struct ctl_table test_table[] = { |
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{ |
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.procname = "int_0001", |
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.data = &test_data.int_0001, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_minmax, |
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.extra1 = &i_zero, |
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.extra2 = &i_one_hundred, |
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}, |
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{ |
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.procname = "int_0002", |
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.data = &test_data.int_0002, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ |
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.procname = "int_0003", |
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.data = &test_data.int_0003, |
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.maxlen = sizeof(test_data.int_0003), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ |
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.procname = "boot_int", |
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.data = &test_data.boot_int, |
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.maxlen = sizeof(test_data.boot_int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE, |
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}, |
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{ |
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.procname = "uint_0001", |
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.data = &test_data.uint_0001, |
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.maxlen = sizeof(unsigned int), |
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.mode = 0644, |
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.proc_handler = proc_douintvec, |
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}, |
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{ |
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.procname = "string_0001", |
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.data = &test_data.string_0001, |
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.maxlen = sizeof(test_data.string_0001), |
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.mode = 0644, |
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.proc_handler = proc_dostring, |
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}, |
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{ |
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.procname = "bitmap_0001", |
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.data = &test_data.bitmap_0001, |
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.maxlen = SYSCTL_TEST_BITMAP_SIZE, |
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.mode = 0644, |
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.proc_handler = proc_do_large_bitmap, |
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}, |
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{ } |
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}; |
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static struct ctl_table_header *test_sysctl_header; |
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static int __init test_sysctl_init(void) |
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{ |
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test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL); |
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if (!test_data.bitmap_0001) |
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return -ENOMEM; |
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test_sysctl_header = register_sysctl("debug/test_sysctl", test_table); |
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if (!test_sysctl_header) { |
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kfree(test_data.bitmap_0001); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
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module_init(test_sysctl_init); |
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static void __exit test_sysctl_exit(void) |
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{ |
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kfree(test_data.bitmap_0001); |
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if (test_sysctl_header) |
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unregister_sysctl_table(test_sysctl_header); |
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} |
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module_exit(test_sysctl_exit); |
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MODULE_AUTHOR("Luis R. Rodriguez <[email protected]>"); |
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MODULE_LICENSE("GPL");
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