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Adding an async write does not work for values larger than 1, because
the fd becomes writable once a value of 1 can be written, but a larger
value might still cause EAGAIN putting us into a busy loop. Hitting the
limit with writing ones is implausible, so async code can just use the
synchronous write method.
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The textual representation matches util-linux. Not all flag values can
be represented textually.
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When using sys.exit, we actually raise a SystemExit exception and as a
consequence exit all context managers. If a particular context manager
pertains only the process at hand, we don't really care, because our
process is supposed to vanish. If a context manager changes external
state such as tempfile.NamedTemporaryFile, this is very bad and
unexpected. We need to ensure that such cleanup is not performed.
This also simplifies the test suite that had to emulate this behaviour
already as pytest uses a context manager.
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