is a system daemon that runs in the background all the time.
Whenever a device is added to or removed from the device tree,
will execute actions specified in
when an Ethernet adapter is added to the system, and kill the
instance when the same adapter is removed.
Another example would be for
to use a table to locate and load via
the proper driver for an unrecognized device that is added to the system.
hooks into the
This device driver has hooks into the device configuration system.
When nodes are added or deleted from the tree, this device will
deliver information about the event to
has parsed the message, it will search its action list for that kind
of event and perform the action with the highest matching value.
For most mundane uses, the default handlers are adequate.
However, for more advanced users, the power is present to tweak every
aspect of what happens.
or the alternate configuration file specified with a
option and uses that file to drive the rest of the process.
While the format of this file is described in
some basics are covered here.
section, one can define multiple directories to search
for config files.
All files in these directories whose names match the pattern
These files are intended to be installed by third party vendors that
wish to hook into the
system without modifying the users other
allows only one active reader,
multiplexes it, forwarding all events to any number of connected clients.
Clients connect by opening the SOCK_SEQPACKET
domain socket at