aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/configs.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /kernel/configs.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'kernel/configs.c')
-rw-r--r--kernel/configs.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/kernel/configs.c b/kernel/configs.c
new file mode 100644
index 000000000000..986f7af31e0a
--- /dev/null
+++ b/kernel/configs.c
@@ -0,0 +1,118 @@
+/*
+ * 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 <rddunlap@osdl.org>
+ * 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/config.h>
+#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_t
+ikconfig_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 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 */

Privacy Policy