This is rmax. :)

I wonder why putting the to be imported socket in blocking mode was added at first place, but unfortunately the checkin comment doesn't tell it:

https://tcltls.rkeene.org/ci/7df7a8696e009447?sbs=1

Could it be that you added this for debugging reasons and forgot to remove it before committing?

BTW, the proposed fix only preserves the state of -translation, but -encoding and -eofchar need to be preserved as well, because setting "-translation binary" implicitly also changes these two options.