Copy File Function in Linux Kernel

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http://www.ubuntux.org – Hi everybody , I'm Sultan Linux and Ubuntu beginner. I downloaded the source code from this link: http://www.kernel.org/pub/linux/kernel/v2.6/linux- I want to see when i press on a file: copy .. and paste in another place. how is it work ? i think using C language .. read and create .. etc where can i find the source code for this function ( copy file ) Thanks ,, Sultan (Distributions)