interview question how does application connects to device

[Bond]

On Tue, Jul 5, 2011 at 11:13 AM, Prashant Shah <pshah.mumbai at gmail.com> wrote:
> Hi,
>
> On Tue, Jul 5, 2011 at 9:45 AM, Bond <jamesbond.2k.g at gmail.com> wrote:
>> This is an interview question.
>> My answer was
>> In unix it simply opens the device node as a file and sends/receives
>> data and commands from it.
>>
>
> A little more detailed method :
>
> Userland read/write to the file -> Calls C Library read/write
> functions -> Makes System Calls for read/write -> (now inside kernel)
> -> Process the system calls (check parameter, etc) -> Refer the
> file_operations structure for that file -> Call the corresponding
> read/write function.
>

This is not correct.If you answer this in interview which I faced as I
did not get that job even you will not.
The answers on this mailing list did not helped.If you would have been
in the interview and given these answers it will not work.
Initially I posted the question on list I was expecting I missed some
thing or interviewer was blabbering more.But I gave 2-3 more
interviews
and all of them asked me same and I gave the answers which I learned
in this thread but I was not selected.

--