Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * linux/fs/proc/kmsg.c
3 *
4 * Copyright (C) 1992 by Linus Torvalds
5 *
6 */
7
8#include <linux/types.h>
9#include <linux/errno.h>
10#include <linux/time.h>
11#include <linux/kernel.h>
12#include <linux/poll.h>
13#include <linux/proc_fs.h>
14#include <linux/fs.h>
15
16#include <asm/uaccess.h>
17#include <asm/io.h>
18
19extern wait_queue_head_t log_wait;
20
21extern int do_syslog(int type, char __user *bug, int count);
22
23static int kmsg_open(struct inode * inode, struct file * file)
24{
25 return do_syslog(1,NULL,0);
26}
27
28static int kmsg_release(struct inode * inode, struct file * file)
29{
30 (void) do_syslog(0,NULL,0);
31 return 0;
32}
33
34static ssize_t kmsg_read(struct file *file, char __user *buf,
35 size_t count, loff_t *ppos)
36{
37 if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0))
38 return -EAGAIN;
39 return do_syslog(2, buf, count);
40}
41
42static unsigned int kmsg_poll(struct file *file, poll_table *wait)
43{
44 poll_wait(file, &log_wait, wait);
45 if (do_syslog(9, NULL, 0))
46 return POLLIN | POLLRDNORM;
47 return 0;
48}
49
50
51static const struct file_operations proc_kmsg_operations = {
52 .read = kmsg_read,
53 .poll = kmsg_poll,
54 .open = kmsg_open,
55 .release = kmsg_release,
56};
57
58static int __init proc_kmsg_init(void)
59{
60 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
61 return 0;
62}
63module_init(proc_kmsg_init);