File timestamp not updated by writes with current snapshot?

[Jonathan Kamens <jik at curl dot com>]

I updated my winsup sources from the CVS repository yesterday and
built cygwin1.dll.  Using the new cygwin1.dll, I'm seeing something
I've never seen before, so I suspect it is somehow related to the DLL,
which is why I'm reporting it here.  Basically, a file's timestamp
isn't being updated, despite the fact that data is being added to the
end of it, until after it's closed.  Observe:

$ (echo foo; ls -l foo 1>&2; sleep 60; echo foo; ls -l foo 1>&2) > foo
-rwxr-xr-x   1 curlbot  Administ        4 Jul 13 16:00 foo
-rwxr-xr-x   1 curlbot  Administ        8 Jul 13 16:00 foo
$ ls -l foo
-rwxr-xr-x   1 curlbot  Administ        8 Jul 13 16:01 foo
$ 

The second ls output line above should say 16:01 but doesn't.

Is this behavior known?  Is it intentional?

Thanks,

  Jonathan Kamens

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