[issue1578269] Add os.link() and os.symlink() and os.path.islink() support for Windows

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Jason, as I see you implemented os.samefile (actually ntpath.samefile) 
but  os.sameopenfile is still not implemented.

Looks like it's easy to do: while GetFinalPathNameByHandle already 
accept file handle you can use CRT function _get_osfhandle(fd) to 
convert file descriptors (arguments for sameopenfile) to file handles 
and pass it to GetFinalPathNameByHandle.

For me samefile and sameopenfile has very close semantic and I like to 
see both if it's possible.

Thanks.

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nosy: +asvetlov

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<http://bugs.python.org/issue1578269>
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