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