ldd scull question about scull_device*

[runcoderen]

hi all:
when I am reading ldd(3rd) book about char device driver.
I have a question to ask:

I have seem the code in scull_init_module to create 4
scull_dev(scull_dev *).

but when I browse scull_write & scull_read function, I can see the code
only secure 1 scull_dev. and I don't know which scull_dev in scull_dev*
created before are I am using.

can anyone help me?

and why the author try to create 4 scull_device in scull_init_module?

					runcoderen

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