On 15 Nov 2019, at 21:51, Dragan Milić via Filesystem-dev 
<filesystem-dev@lists.apple.com> wrote:

> I wonder what file metadata/flags/xattrs are used to signal that file is 
> being in use and to report download progress?

There have been various ways to do this over the years but I believe the 
current state of the art is all the file operation support in `NSProgress`.

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware


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