interview question how does application connects to device
From: Prashant Shah <hidden>
Date: 2011-07-05 05:43:50
Possibly related (same subject, not in this thread)
- 2011-07-07 · interview question how does application connects to device · Javier Martinez Canillas <hidden>
- 2011-07-07 · interview question how does application connects to device · Greg Freemyer <hidden>
- 2011-07-06 · interview question how does application connects to device · Javier Martinez Canillas <hidden>
- 2011-07-06 · interview question how does application connects to device · Mandeep Sandhu <hidden>
Hi, On Tue, Jul 5, 2011 at 9:45 AM, Bond [off-list ref] 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.