xfs: fix type usage
[linux/fpc-iii.git] / fs / proc / kmsg.c
blobe0f8774acd658a9ea084fded8ce265a2f1efa36f
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/proc/kmsg.c
5 * Copyright (C) 1992 by Linus Torvalds
7 */
9 #include <linux/types.h>
10 #include <linux/errno.h>
11 #include <linux/time.h>
12 #include <linux/kernel.h>
13 #include <linux/poll.h>
14 #include <linux/proc_fs.h>
15 #include <linux/fs.h>
16 #include <linux/syslog.h>
18 #include <linux/uaccess.h>
19 #include <asm/io.h>
21 extern wait_queue_head_t log_wait;
23 static int kmsg_open(struct inode * inode, struct file * file)
25 return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
28 static int kmsg_release(struct inode * inode, struct file * file)
30 (void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
31 return 0;
34 static ssize_t kmsg_read(struct file *file, char __user *buf,
35 size_t count, loff_t *ppos)
37 if ((file->f_flags & O_NONBLOCK) &&
38 !do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
39 return -EAGAIN;
40 return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
43 static unsigned int kmsg_poll(struct file *file, poll_table *wait)
45 poll_wait(file, &log_wait, wait);
46 if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
47 return POLLIN | POLLRDNORM;
48 return 0;
52 static const struct file_operations proc_kmsg_operations = {
53 .read = kmsg_read,
54 .poll = kmsg_poll,
55 .open = kmsg_open,
56 .release = kmsg_release,
57 .llseek = generic_file_llseek,
60 static int __init proc_kmsg_init(void)
62 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
63 return 0;
65 fs_initcall(proc_kmsg_init);