/*
 *  linux/fs/proc/kmsg.c
 *
 *  Copyright (C) 1992  by Linus Torvalds
 *
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
#include <linux/syslog.h>

#include <linux/uaccess.h>
#include <asm/io.h>

extern wait_queue_head_t log_wait;

static int kmsg_open(struct inode * inode, struct file * file)
{
	return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
}

static int kmsg_release(struct inode * inode, struct file * file)
{
	(void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
	return 0;
}

static ssize_t kmsg_read(struct file *file, char __user *buf,
			 size_t count, loff_t *ppos)
{
	if ((file->f_flags & O_NONBLOCK) &&
	    !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
		return -EAGAIN;
	return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
}

static unsigned int kmsg_poll(struct file *file, poll_table *wait)
{
	poll_wait(file, &log_wait, wait);
	if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
		return POLLIN | POLLRDNORM;
	return 0;
}


static const struct file_operations proc_kmsg_operations = {
	.read		= kmsg_read,
	.poll		= kmsg_poll,
	.open		= kmsg_open,
	.release	= kmsg_release,
	.llseek		= generic_file_llseek,
};

static int __init proc_kmsg_init(void)
{
	proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
	return 0;
}
fs_initcall(proc_kmsg_init);
s='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/include/trace/events/rcu.h'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/include/trace/events/rcu.h?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/rcu.h?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/trace/events/rcu.h?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/trace/events/rcu.h'>
<input type='hidden' name='id' value='770f82253dbd7e6892a88018f2f6cd395f48d214'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/trace?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>trace</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/trace/events?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>events</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/trace/events/rcu.h?id=770f82253dbd7e6892a88018f2f6cd395f48d214'>rcu.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/trace/events/rcu.h?id=770f82253dbd7e6892a88018f2f6cd395f48d214&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>