> You don't check return code here, does write succeed at all?

Yes, both writes return 6.

> Does it ever produce e.g. OuOuilleille

No.

> (as this is what atomicity is about here)?

I was referring to the claim that under Linux writing and adjusting the
file offset are performed as an atomic step, not to the atomicity of the
write operation itself.

-- Juliusz
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