[PATCH] Properly handle short writes in sigint handlers

[David Edmondson]

Sorry for being slow.

Can you describe the situation in which you expect a write to stderr to
be a short write? (Without error.)

In that situation, what guarantee is there that the loop you've written
will terminate?

We're not talking about safeguarding a users' data here - this is a
short message to indicate that a tool is terminating due to a signal.
I'm concerned that the solution is worse than the problem.
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