[PATCH] more advanced user query options

Here is the '-h' and a '-d' to dump the whole database:

  kay@pim:~/src/udev.kay$ ./udev -d
  P: /block/hdb/hdb1
  N: hdb1
  S:
  O:
  G:

  P: /class/video4linux/video0
  N: video/webcam0
  S: camera0 kamera0
  O: 500
  G: 500

  P: /block/hdc
  N: hdc
  S:
  O:
  G:

1 files changed, 1 insertions, 0 deletions

diff --git a/udevdb.h b/udevdb.h
index f36a9ca799..a0e5338265 100644
--- a/udevdb.h
+++ b/udevdb.h
@@ -12,6 +12,7 @@
 extern void udevdb_exit(void);
 extern int udevdb_init(int init_flag);
 extern int udevdb_open_ro(void);
+extern int udevdb_dump(void (*user_record_handler) (char *path, struct udevice *dev));
 
 extern int udevdb_add_dev(const char *path, const struct udevice *dev);
 extern int udevdb_get_dev(const char *path, struct udevice *dev);