4 * Copyright (C) 1992 by Linus Torvalds
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>
15 #include <linux/syslog.h>
17 #include <linux/uaccess.h>
20 extern wait_queue_head_t log_wait;
22 static int kmsg_open(struct inode * inode, struct file * file)
24 return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
27 static int kmsg_release(struct inode * inode, struct file * file)
29 (void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
33 static ssize_t kmsg_read(struct file *file, char __user *buf,
34 size_t count, loff_t *ppos)
36 if ((file->f_flags & O_NONBLOCK) &&
37 !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
39 return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
42 static unsigned int kmsg_poll(struct file *file, poll_table *wait)
44 poll_wait(file, &log_wait, wait);
45 if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
46 return POLLIN | POLLRDNORM;
51 static const struct file_operations proc_kmsg_operations = {
55 .release = kmsg_release,
56 .llseek = generic_file_llseek,
59 static int __init proc_kmsg_init(void)
61 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
64 fs_initcall(proc_kmsg_init);