Consistently present absent stdio handles on Windows as NULL handles. by sunfish...
source link: https://github.com/rust-lang/rust/pull/93263
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This addresses #90964 by making the std API consistent about presenting
absent stdio handles on Windows as NULL handles. Stdio handles may be
absent due to #![windows_subsystem = "windows"], due to the console
being detached, or due to a child process having been launched from a
parent where stdio handles are absent.
Specifically, this fixes the case of child processes of parents with absent
stdio, which previously ended up with stdin().as_raw_handle() returningINVALID_HANDLE_VALUE, which was surprising, and which overlapped with an
unrelated valid handle value. With this patch, stdin().as_raw_handle()
now returns null in these situation, which is consistent with what it
does in the parent process.
And, document this in the "Windows Portability Considerations" sections of
the relevant documentation.
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