[issue26826] Expose new copy_file_range() syscal in os module and use it to improve shutils.copy()

[STINNER Victor]

STINNER Victor added the comment:

Kerbel support ok, but what about the libc support? Do you know if it is
planned? Or do you want to use the syscall() low-level API. If we take the
syscall() path, I suggest to make the function private in the os module.
Wait until the API is standardized in the libc. Sometimes the libc changes
minor things, ir's not always a thin wrapper to the syscall.

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<http://bugs.python.org/issue26826>
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