[issue10115] accept4 can fail with errno 90

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> That's another possibility, in which case we would first remove the
> current accept4-calling code in order to fix the buildbot failure.

In Python, the lowest layer facing the operating system always directly
exposes the API as-is, without reinterpreting the user's request. Not
following this principle leads exactly to this kind of problem.

So I think .accept() should only call accept(2), and accept4() should
only be called if explicitly requested by the application.

Exposing it as .accept4(flags) is certainly the most straight-forward
way of doing it, but I could also live with .accept(flags) (i.e.
call accept4 if flags are being passed, hoping that no other system
comes up with another accept extension that has a different integer
argument).

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