projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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/fs.h> | |
| 14 | ||
| 15 | #include <asm/uaccess.h> | |
| 16 | #include <asm/io.h> | |
| 17 | ||
| 18 | extern wait_queue_head_t log_wait; | |
| 19 | ||
| 20 | extern int do_syslog(int type, char __user *bug, int count); | |
| 21 | ||
| 22 | static int kmsg_open(struct inode * inode, struct file * file) | |
| 23 | { | |
| 24 | return do_syslog(1,NULL,0); | |
| 25 | } | |
| 26 | ||
| 27 | static int kmsg_release(struct inode * inode, struct file * file) | |
| 28 | { | |
| 29 | (void) do_syslog(0,NULL,0); | |
| 30 | return 0; | |
| 31 | } | |
| 32 | ||
| 33 | static ssize_t kmsg_read(struct file *file, char __user *buf, | |
| 34 | size_t count, loff_t *ppos) | |
| 35 | { | |
| 36 | if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0)) | |
| 37 | return -EAGAIN; | |
| 38 | return do_syslog(2, buf, count); | |
| 39 | } | |
| 40 | ||
| 41 | static unsigned int kmsg_poll(struct file *file, poll_table *wait) | |
| 42 | { | |
| 43 | poll_wait(file, &log_wait, wait); | |
| 44 | if (do_syslog(9, NULL, 0)) | |
| 45 | return POLLIN | POLLRDNORM; | |
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| 49 | ||
| 50 | struct file_operations proc_kmsg_operations = { | |
| 51 | .read = kmsg_read, | |
| 52 | .poll = kmsg_poll, | |
| 53 | .open = kmsg_open, | |
| 54 | .release = kmsg_release, | |
| 55 | }; |