IMHO we could remove the call to `fopen` and the related check entirely. The resulting `file` is never used for reading/writing. It seems that replacing `fopen` with `open`/`_open` will give us a duplicate descriptor, and thus we will still have to close one of them: the new one of `fd`. If that's OK, before I replace `fopen` with `open`, could you please tell me why is it needed there in the first place?
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