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device(9)

The  device object represents a piece of hardware attached to the
system such as an expansion card, the  bus  which  that  card  is
plugged  into,  disk  drives  attached to the expansion card etc.
The system defines one device, and all other devices are  created
dynamically  during  autoconfiguration.   Normally devices repre‐
senting top-level buses in the system (ISA, PCI etc.) will be at‐
tached directly to and other devices will be added as children of
their relevant bus.  The devices in a system form  a  tree.   All
devices  except  have  a  parent (see In addition, any device can
have children attached to it (see and A  device  which  has  been
successfully  probed  and attached to the system will also have a
driver (see and and a devclass (see and Various other  attributes
of  the  device  include  a  unit number (see verbose description
(normally supplied by the driver, see and a set  of  bus-specific
variables  (see  and  a set of driver-specific variables (see De‐
vices can be in one of several states: the device  has  not  been
probed  for  existence  or the probe failed the device probe suc‐
ceeded but not yet attached the device has been successfully  at‐
tached  the device is currently open The current state of the de‐
vice can be determined by calling This manual page was written by














































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