Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/kernel/configs.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 3335 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * kernel/configs.c |
3 | * Echo the kernel .config file used to build the kernel |
4 | * |
5 | * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com> |
6 | * Copyright (C) 2002 Randy Dunlap <rddunlap@osdl.org> |
7 | * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com> |
8 | * Copyright (C) 2002 Hewlett-Packard Company |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2 of the License, or (at |
13 | * your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, but |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
18 | * NON INFRINGEMENT. See the GNU General Public License for more |
19 | * details. |
20 | * |
21 | * You should have received a copy of the GNU General Public License |
22 | * along with this program; if not, write to the Free Software |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
24 | */ |
25 | |
26 | #include <linux/config.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/module.h> |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> |
31 | #include <linux/init.h> |
32 | #include <asm/uaccess.h> |
33 | |
34 | /**************************************************/ |
35 | /* the actual current config file */ |
36 | |
37 | /* |
38 | * Define kernel_config_data and kernel_config_data_size, which contains the |
39 | * wrapped and compressed configuration file. The file is first compressed |
40 | * with gzip and then bounded by two eight byte magic numbers to allow |
41 | * extraction from a binary kernel image: |
42 | * |
43 | * IKCFG_ST |
44 | * <image> |
45 | * IKCFG_ED |
46 | */ |
47 | #define MAGIC_START "IKCFG_ST" |
48 | #define MAGIC_END "IKCFG_ED" |
49 | #include "config_data.h" |
50 | |
51 | |
52 | #define MAGIC_SIZE (sizeof(MAGIC_START) - 1) |
53 | #define kernel_config_data_size \ |
54 | (sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2) |
55 | |
56 | #ifdef CONFIG_IKCONFIG_PROC |
57 | |
58 | /**************************************************/ |
59 | /* globals and useful constants */ |
60 | |
61 | static ssize_t |
62 | ikconfig_read_current(struct file *file, char __user *buf, |
63 | size_t len, loff_t * offset) |
64 | { |
65 | loff_t pos = *offset; |
66 | ssize_t count; |
67 | |
68 | if (pos >= kernel_config_data_size) |
69 | return 0; |
70 | |
71 | count = min(len, (size_t)(kernel_config_data_size - pos)); |
72 | if (copy_to_user(buf, kernel_config_data + MAGIC_SIZE + pos, count)) |
73 | return -EFAULT; |
74 | |
75 | *offset += count; |
76 | return count; |
77 | } |
78 | |
79 | static struct file_operations ikconfig_file_ops = { |
80 | .owner = THIS_MODULE, |
81 | .read = ikconfig_read_current, |
82 | }; |
83 | |
84 | /***************************************************/ |
85 | /* ikconfig_init: start up everything we need to */ |
86 | |
87 | static int __init ikconfig_init(void) |
88 | { |
89 | struct proc_dir_entry *entry; |
90 | |
91 | /* create the current config file */ |
92 | entry = create_proc_entry("config.gz", S_IFREG | S_IRUGO, |
93 | &proc_root); |
94 | if (!entry) |
95 | return -ENOMEM; |
96 | |
97 | entry->proc_fops = &ikconfig_file_ops; |
98 | entry->size = kernel_config_data_size; |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | /***************************************************/ |
104 | /* ikconfig_cleanup: clean up our mess */ |
105 | |
106 | static void __exit ikconfig_cleanup(void) |
107 | { |
108 | remove_proc_entry("config.gz", &proc_root); |
109 | } |
110 | |
111 | module_init(ikconfig_init); |
112 | module_exit(ikconfig_cleanup); |
113 | |
114 | MODULE_LICENSE("GPL"); |
115 | MODULE_AUTHOR("Randy Dunlap"); |
116 | MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); |
117 | |
118 | #endif /* CONFIG_IKCONFIG_PROC */ |