[go-nuts] fd polling with syscall.Select

Okay, I was thinking in the context of network communication, which is
where I have often exercised the logic suggested.

For local file descriptors, the situation is indeed less clear when you
want to interact with serial buses or the such. That said, the amount of
boilerplate I had to figure out for having a serial line properly working
from Go [1] was in itself a much more time consuming task than figuring how
to close the file descriptor without races. I'm not saying what you suggest
is not a problem, but it's a tiny part of having things working at all in
those scenarios.

[1] With a thermal printer, in that case.