Internal Program Version: eudev  3.2.9

Udev creates and removes device nodes in /dev for devices discovered or
removed from the system. It receives events via kernel netlink messages
and dispatches them according to rules in /lib/udev/rules.d/. Matching
rules may name a device node, create additional symlinks to the node,
call tools to initialize a device, or load needed kernel modules.

http://dev.gentoo.org/~blueness/eudev