Hi.
I am implementing a character device.And I have a doubt while
implementing write and read functions for that driver.
In read function if the we have read all the data upto the maximum size
of the device and then we call one more read what we have to return
either 0 or -1.
And In Write function if we have written up to maximum size of the
device and then if we are trying to write some more data then wht we
have to return either error or 0.
Will you please help me.
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