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Linux/kernel/configs.c

  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 <rdunlap@xenotime.net>
  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/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/proc_fs.h>
 29 #include <linux/seq_file.h>
 30 #include <linux/init.h>
 31 #include <linux/uaccess.h>
 32 
 33 /**************************************************/
 34 /* the actual current config file                 */
 35 
 36 /*
 37  * Define kernel_config_data and kernel_config_data_size, which contains the
 38  * wrapped and compressed configuration file.  The file is first compressed
 39  * with gzip and then bounded by two eight byte magic numbers to allow
 40  * extraction from a binary kernel image:
 41  *
 42  *   IKCFG_ST
 43  *   <image>
 44  *   IKCFG_ED
 45  */
 46 #define MAGIC_START     "IKCFG_ST"
 47 #define MAGIC_END       "IKCFG_ED"
 48 #include "config_data.h"
 49 
 50 
 51 #define MAGIC_SIZE (sizeof(MAGIC_START) - 1)
 52 #define kernel_config_data_size \
 53         (sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2)
 54 
 55 #ifdef CONFIG_IKCONFIG_PROC
 56 
 57 static ssize_t
 58 ikconfig_read_current(struct file *file, char __user *buf,
 59                       size_t len, loff_t * offset)
 60 {
 61         return simple_read_from_buffer(buf, len, offset,
 62                                        kernel_config_data + MAGIC_SIZE,
 63                                        kernel_config_data_size);
 64 }
 65 
 66 static const struct file_operations ikconfig_file_ops = {
 67         .owner = THIS_MODULE,
 68         .read = ikconfig_read_current,
 69         .llseek = default_llseek,
 70 };
 71 
 72 static int __init ikconfig_init(void)
 73 {
 74         struct proc_dir_entry *entry;
 75 
 76         /* create the current config file */
 77         entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
 78                             &ikconfig_file_ops);
 79         if (!entry)
 80                 return -ENOMEM;
 81 
 82         proc_set_size(entry, kernel_config_data_size);
 83 
 84         return 0;
 85 }
 86 
 87 static void __exit ikconfig_cleanup(void)
 88 {
 89         remove_proc_entry("config.gz", NULL);
 90 }
 91 
 92 module_init(ikconfig_init);
 93 module_exit(ikconfig_cleanup);
 94 
 95 #endif /* CONFIG_IKCONFIG_PROC */
 96 
 97 MODULE_LICENSE("GPL");
 98 MODULE_AUTHOR("Randy Dunlap");
 99 MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
100 

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