> On 16 Nov 2019, at 14:23, Quinn The Eskimo! via Filesystem-dev 
> <[email protected]> wrote:
> 
> 
> On 15 Nov 2019, at 21:51, Dragan Milić via Filesystem-dev 
> <[email protected]> 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`.

I'm also thinking part of the answer lies in NSFileCoordinator/NSFilePresenter 
via the filecoordinationd daemon, rather than file metadata/flags/xattrs.

Thomas
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