[issue43743] BlockingIOError: [Errno 11] Resource temporarily unavailable: on GPFS.

[Giampaolo Rodola']

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

> The question seems to be is if it should be okay to _GiveUpOnFastCopy after a partial (incomplete) copy has already occurred via sendfile.

I think it should not. For posterity: my rationale for introducing _USE_CP_SENDFILE was to allow monkey patching for corner cases such as this one (see also bpo-36610 / GH-13675), but expose it as a private name because I expected them to be rare and likely up to a broken underlying implementation, as it appears this is the case. FWIW, I deem _USE_CP_SENDFILE usage in production code as legitimate, and as such it should stay private but never be removed.

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versions: +Python 3.9

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