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When checking for the validity of the stdio file descriptors (nodejs#875),
ones which don't exist are intended to be remapped to /dev/null (and, if
that doesn't work, we abort).
This however doesn't work on all platforms and in all cases (e.g. /dev/null
could already have been opened by the acting process and not actually be
mapped to the expected file descriptor); instead, use the `dup2` syscall
as a more robust solution (conforms to POSIX.1).
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