Restarting udevd

[Dan McGee <dpmcgee@xxxxxxxxx>]

In trying to answer the question "What is the proper way to restart
udevd on a running system?", the following questions came up:

1. I was informed something such as `killall udevd && udevd --daemon`
was not safe, is this true?
2. Is doing `udevadm control --exit && udevd --daemon` any better?
3. Now that the decision [1] has been made to move udevd out of the
system path, how is one supposed to even locate the binary to restart?
4. Should there be a `udevadm control --restart` command?

-Dan McGee

[1] http://git.kernel.org/?p=linux/hotplug/udev.git;a=commit;h=d964a4bfde57ad1b05d105edd5d078e1aac45da6
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