Re: interview question how does application connects to device

Hi, On Tue, Jul 5, 2011 at 9:45 AM, Bond <jamesbond.2k.g@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.