root/fs/proc/kmsg.c

DEFINITIONS

1. kmsg_open
2. kmsg_release
3. kmsg_read
4. kmsg_poll

/*
 *  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/fs.h>

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

#include "internal.h"

extern wait_queue_head_t log_wait;

extern int do_syslog(int type, char __user *bug, int count);

static int kmsg_open(struct inode * inode, struct file * file)
{
        return do_syslog(1,NULL,0);
}

static int kmsg_release(struct inode * inode, struct file * file)
{
        (void) do_syslog(0,NULL,0);
        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(9, NULL, 0))
                return -EAGAIN;
        return do_syslog(2, buf, count);
}

static unsigned int kmsg_poll(struct file *file, poll_table *wait)
{
        poll_wait(file, &log_wait, wait);
        if (do_syslog(9, NULL, 0))
                return POLLIN | POLLRDNORM;
        return 0;
}


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