On Sun, Feb 7, 2010 at 6:11 PM, Theo de Raadt <dera...@cvs.openbsd.org> wrote: > And in mv, for the cross-device case? I see others that do fast > reads, like sum. diff? cmp? grep? How many others? If cp(1) > is such a common operation (I bet it isn't), how soon before other > programs doing exactly the same thing want the same chunk of code?
If mv has different file copying code than cp, that's a bug that can be fixed... How many *writes* does sum do? It doesn't need a large buffer because it's not moving the disk heads to two different locations. I don't know how cmp works, but diff reads both *entire* files into memory before processing, so that's not a good example of how to do things.
