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Subjecttheory and implemenation of sys/devfs/udev/dev/proc etc
Someone have a pointer to a good technical overview, and details, of how 
specific locations of drivers are determined and used in these special
directories?

for example, the below udevinfo command shows info from:
to match the device for which the node will be created.
looking at the device chain at
'/sys/devices/pci0000:00/0000:00:07.0':
====
udevinfo -p /sys/class/net/eth0/ -a

and several other locations. how is the path determined? how are these
numbers determined? how do programs use this information to do their
thing? are these commonly known address/directories and if so how are
the paths determined?

this is all darn new to me so please excuse any simple questions to you.
I have been reading the kernel source and its slow going.

Thanks,
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