[issue10882] Add os.sendfile()

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Could you please also add support for offset argument on Linux?
Also, "headers", "trailers" and "flags" could be turned in keyword args for simplicity.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10882>
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