interview question how does application connects to device

[Prashant Shah]

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.