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 const struct file_operations proc_kmsg_operations = { 51 .read = kmsg_read, 52 .poll = kmsg_poll, 53 .open = kmsg_open, 54 .release = kmsg_release, 55 }; 56