kmsg.c 1.1 KB

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  1. /*
  2. * linux/fs/proc/kmsg.c
  3. *
  4. * Copyright (C) 1992 by Linus Torvalds
  5. *
  6. */
  7. #include <linux/types.h>
  8. #include <linux/errno.h>
  9. #include <linux/time.h>
  10. #include <linux/kernel.h>
  11. #include <linux/poll.h>
  12. #include <linux/fs.h>
  13. #include <asm/uaccess.h>
  14. #include <asm/io.h>
  15. extern wait_queue_head_t log_wait;
  16. extern int do_syslog(int type, char __user *bug, int count);
  17. static int kmsg_open(struct inode * inode, struct file * file)
  18. {
  19. return do_syslog(1,NULL,0);
  20. }
  21. static int kmsg_release(struct inode * inode, struct file * file)
  22. {
  23. (void) do_syslog(0,NULL,0);
  24. return 0;
  25. }
  26. static ssize_t kmsg_read(struct file *file, char __user *buf,
  27. size_t count, loff_t *ppos)
  28. {
  29. if ((file->f_flags & O_NONBLOCK) && !do_syslog(9, NULL, 0))
  30. return -EAGAIN;
  31. return do_syslog(2, buf, count);
  32. }
  33. static unsigned int kmsg_poll(struct file *file, poll_table *wait)
  34. {
  35. poll_wait(file, &log_wait, wait);
  36. if (do_syslog(9, NULL, 0))
  37. return POLLIN | POLLRDNORM;
  38. return 0;
  39. }
  40. const struct file_operations proc_kmsg_operations = {
  41. .read = kmsg_read,
  42. .poll = kmsg_poll,
  43. .open = kmsg_open,
  44. .release = kmsg_release,
  45. };