[runtime] Clarify redirect_io behaviour #7409
Merged
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Change
redirect_ioto be easier to re-use correctly, i.e. returning thefile descriptor (instead of
0).Comment why the file descriptor are never released. It makes sense but
it's not obvious (even less in
redirect_io) without comments.Using static fields also makes it easier for static analysis (locals are
easier to process).
Finally reuse, mostly, the same string for the error message, i.e.
versus