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 #include "internal.h" 19 20 extern wait_queue_head_t log_wait; 21 22 extern int do_syslog(int type, char __user *bug, int count); 23 24 static int kmsg_open(struct inode * inode, struct file * file) 25 { 26 return do_syslog(1,NULL,0); 27 } 28 29 static int kmsg_release(struct inode * inode, struct file * file) 30 { 31 (void) do_syslog(0,NULL,0); 32 return 0; 33 } 34 35 static ssize_t kmsg_read(struct file *file, char __user *buf, 36 size_t count, loff_t *ppos) 37 { 38 if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0)) 39 return -EAGAIN; 40 return do_syslog(2, buf, count); 41 } 42 43 static unsigned int kmsg_poll(struct file *file, poll_table *wait) 44 { 45 poll_wait(file, &log_wait, wait); 46 if (do_syslog(9, NULL, 0)) 47 return POLLIN | POLLRDNORM; 48 return 0; 49 } 50 51 52 const struct file_operations proc_kmsg_operations = { 53 .read = kmsg_read, 54 .poll = kmsg_poll, 55 .open = kmsg_open, 56 .release = kmsg_release, 57 }; 58