[issue15078] Change os.sendfile so its arguments are stable

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

I believe, that instead of a integer flags will be better and more portable to use boolean parameters (diskio=True, wait=True, sync=False). All additional parameters should be keyword-only.

os.sendfile(out, in, offset, nbytes, *, headers=None, trailers=None, diskio=True, wait=True, sync=False)

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nosy: +storchaka

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<http://bugs.python.org/issue15078>
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