fs/proc/kmsg.c

   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/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/poll.h>
  13
  14 #include <asm/uaccess.h>
  15 #include <asm/io.h>
  16
  17 extern unsigned long log_size;
  18 extern wait_queue_head_t log_wait;
  19
  20 extern int do_syslog(int type, char * 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 * buf,
  34                          size_t count, loff_t *ppos)
  35 {
  36         return do_syslog(2,buf,count);
  37 }
  38
  39 static unsigned int kmsg_poll(struct file *file, poll_table * wait)
  40 {
  41         poll_wait(file, &log_wait, wait);
  42         if (log_size)
  43                 return POLLIN | POLLRDNORM;
  44         return 0;
  45 }
  46
  47
  48 static struct file_operations proc_kmsg_operations = {
  49         NULL,           /* kmsg_lseek */
  50         kmsg_read,
  51         NULL,           /* kmsg_write */
  52         NULL,           /* kmsg_readdir */
  53         kmsg_poll,      /* kmsg_poll */
  54         NULL,           /* kmsg_ioctl */
  55         NULL,           /* mmap */
  56         kmsg_open,
  57         NULL,           /* flush */
  58         kmsg_release,
  59         NULL            /* can't fsync */
  60 };
  61
  62 struct inode_operations proc_kmsg_inode_operations = {
  63         &proc_kmsg_operations,  /* default base directory file-ops */
  64         NULL,                   /* create */
  65         NULL,                   /* lookup */
  66         NULL,                   /* link */
  67         NULL,                   /* unlink */
  68         NULL,                   /* symlink */
  69         NULL,                   /* mkdir */
  70         NULL,                   /* rmdir */
  71         NULL,                   /* mknod */
  72         NULL,                   /* rename */
  73         NULL,                   /* readlink */
  74         NULL,                   /* follow_link */
  75         NULL,                   /* get_block */
  76         NULL,                   /* readpage */
  77         NULL,                   /* writepage */
  78         NULL,                   /* flushpage */
  79         NULL,                   /* truncate */
  80         NULL,                   /* permission */
  81         NULL,                   /* smap */
  82         NULL                    /* revalidate */
  83 };