interview question how does application connects to device

[Anuz Pratap Singh Tomar]

On Sun, Jul 17, 2011 at 4:40 PM, Bond <jamesbond.2k.g at gmail.com> wrote:

> On Sun, Jul 17, 2011 at 9:04 PM, Anuz Pratap Singh Tomar
> <chambilkethakur at gmail.com> wrote:
> >
> >
> > On Sun, Jul 17, 2011 at 4:10 PM, Bond <jamesbond.2k.g at gmail.com> wrote:
> >>
> >> 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.
> >>
> >> --
> >
> >
> > This list is not an interview question answering mailing list.
> > Not getting selected have nothing to do with answers being right or
> wrong.
> > Being selected in an interview has a lot of other factors.
> >
> >
> Why do not you understand that this has nothing to my selection what I
> wanted to know is how does the app gets connected to device.And your
> rant does not help to understand.The answers given on this list are of
> very poor quality as usual.
> As an example you rather than answering some thing meaningful reproduced
> rant.
>

Greg Freemyer answered your question with fine details. And the discussion
that followed elaborated the point.
But you say all that is NOT correct? on what basis did you say that?
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