balazske added a comment. If we look only at the C standard we can not tell much about if the functions should set `errno`. It seems that setting `errno` is totally implementation-dependent, except for a few functions that mention `errno`. These are `fgetpos`, `fsetpos`, `ftell` and should set `errno` to a positive value on error (but there is no guarantee that value of `errno` is preserved if no error occurs). And `errno` is always positive. This is different than what the checker currently does (with the new patches). Probably this should be a discourse question?
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