jim at jrssystems.net
Fri Feb 20 23:06:17 GMT 2004
Hmmm. It's odd to think that Cygwin always uses backup semantics,
because it DEFINITELY fails to process quite a lot of files that the
high-dollar win32-native backup utilities can process.
My experience has been that cygwin can open (for reading) any file that
you can use the GUI to drag-and-drop-copy, but it cannot open any file
that the GUI will not drag-and-drop copy.
Example: you're downloading a large MPEG using IE. WMP will refuse to
open the partial file because it's locked to some extent - but you can
use the GUI to make a copy of the partial file, and WMP will then open
Some other files, however - for instance Outlook .PST files - are
absolutely uncopyable using the GUI when they are locked by the
processes that play with them.
My experience is that cygwin can open files that are locked read-only -
like partial IE downloads - but CANNOT open files that are completely
locked - like Outlook's .PSTs.
Please keep us posted how your research on this stuff turns out.
> I've received a reply from the Cygwin people that suggests
> Cygwin _always_ uses backup semantics, and a little information
> about how. It's some pretty hairy code and I'm still deciphering
> it, but it could be that I was authoring that patch for nothing.
> I'll post more when I figure it out.
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