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Purpose of rules file:
Sends all uevents to a Unix-domain socket, where they can be monitored by other
programs.
Description of rules:
There is only one rule, which matches all uevents. It uses Udev's RUN key to
specify a socket to send each uevent to. Normally RUN is used to start up a
process, but if the pathname starts with "socket:", Udev instead interprets
the rest of the name as a Unix-domain socket to send the uevent to. In this
case, we send send the uevent to the socket named /org/kernel/udev/monitor,
which is created by the udevmonitor program. Udevmonitor is used to watch
uevents as they come to Udev. Its only purpose is for debugging, but sending
the uevent to a socket that doesn't exist is a very cheap operation, so we
enable this rule for all uevents.
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