@RichFelker Does musl block exit() per the standard if a thread holds a FILE* lock? https://sourceware.org/bugzilla/show_bug.cgi?id=22759 …
In hindsight my uncertainty about how it should be resolved was wrong. There's no reasonable way to specify that they're flushed/offset-adjusted without synchronization.
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I'm worried about hanging programs which previously worked fine, albeit didn't flush all of their stream data. However, the converse is true too, I'd be upset if my data *should* have been flushed but wasn't.
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