Re: copy_to_user() and copy_from_user(): confusing code

[Chetan Nanda <chetannanda@xxxxxxxxx>]

On Sun, Sep 26, 2010 at 10:09 AM, Dave Hylands <dhylands@xxxxxxxxx> wrote:

Hi,

Replying to the list this time.

On Sat, Sep 25, 2010 at 10:22 PM, Bond <jamesbond.2k.g@xxxxxxxxx> wrote:
>>> write(1, "abcde", 5)                    = 1

User mode tried to write 5 characters.
The driver only accepted one (which is evidenced by the return code
which is the number of characters which the driver accepted).

>>> write(1, "bcde", 4)                     = 1

So usermode then tried to write the remaining 4 characters.
The driver only accepted one.

>>> write(1, "cde", 3)                      = 1

etc.

Exactly what I was trying to indicate ....

--
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/