118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* kernel/configs.c
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* Echo the kernel .config file used to build the kernel
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*
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* Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
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* Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
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* Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
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* Copyright (C) 2002 Hewlett-Packard Company
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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/**************************************************/
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/* the actual current config file */
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/*
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* Define kernel_config_data and kernel_config_data_size, which contains the
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* wrapped and compressed configuration file. The file is first compressed
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* with gzip and then bounded by two eight byte magic numbers to allow
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* extraction from a binary kernel image:
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*
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* IKCFG_ST
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* <image>
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* IKCFG_ED
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*/
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#define MAGIC_START "IKCFG_ST"
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#define MAGIC_END "IKCFG_ED"
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#include "config_data.h"
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#define MAGIC_SIZE (sizeof(MAGIC_START) - 1)
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#define kernel_config_data_size \
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(sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2)
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#ifdef CONFIG_IKCONFIG_PROC
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/**************************************************/
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/* globals and useful constants */
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static ssize_t
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ikconfig_read_current(struct file *file, char __user *buf,
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size_t len, loff_t * offset)
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{
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loff_t pos = *offset;
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ssize_t count;
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if (pos >= kernel_config_data_size)
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return 0;
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count = min(len, (size_t)(kernel_config_data_size - pos));
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if (copy_to_user(buf, kernel_config_data + MAGIC_SIZE + pos, count))
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return -EFAULT;
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*offset += count;
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return count;
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}
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static const struct file_operations ikconfig_file_ops = {
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.owner = THIS_MODULE,
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.read = ikconfig_read_current,
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};
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/***************************************************/
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/* ikconfig_init: start up everything we need to */
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static int __init ikconfig_init(void)
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{
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struct proc_dir_entry *entry;
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/* create the current config file */
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entry = create_proc_entry("config.gz", S_IFREG | S_IRUGO,
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&proc_root);
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if (!entry)
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return -ENOMEM;
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entry->proc_fops = &ikconfig_file_ops;
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entry->size = kernel_config_data_size;
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return 0;
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}
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/***************************************************/
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/* ikconfig_cleanup: clean up our mess */
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static void __exit ikconfig_cleanup(void)
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{
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remove_proc_entry("config.gz", &proc_root);
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}
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module_init(ikconfig_init);
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module_exit(ikconfig_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Randy Dunlap");
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MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
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#endif /* CONFIG_IKCONFIG_PROC */
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