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20 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 .Nd an abstract representation of a device
38 The device object represents a piece of hardware attached to the
50 The devices in a system form a tree.
53 have a parent (see
54 .Xr device_get_parent 9 ) .
56 .Xr device_add_child 9 ,
57 .Xr device_add_child_ordered 9 ,
58 .Xr device_find_child 9 ,
59 .Xr device_get_children 9 ,
61 .Xr device_delete_child 9 ) .
63 A device which has been successfully probed and attached to the
64 system will also have a driver (see
65 .Xr device_get_driver 9
67 .Xr driver 9 )
68 and a devclass (see
69 .Xr device_get_devclass 9
71 .Xr devclass 9 ) .
72 Various other attributes of the device include a unit number (see
73 .Xr device_get_unit 9 ) ,
75 .Xr device_set_desc 9
77 .Xr device_get_desc 9 ) ,
78 a set of bus-specific variables (see
79 .Xr device_get_ivars 9 )
80 and a set of driver-specific variables (see
81 .Xr device_get_softc 9 ) .
96 .Xr device_get_state 9 .
98 .Xr devclass 9 ,
99 .Xr driver 9