bug#54245: 29.0.50; select usage in GNUstep

[Robert Pluim]

>>>>> On Sat, 05 Mar 2022 08:45:03 +0800, Po Lu <luangruo@yahoo.com> said:

    Po> That LGTM, but I only tested on GNUstep.  The same code is also used on
    Po> macOS, so there might be some side effects.

Iʼm on macOS

    Po> Though the NS port is very old and I get the feeling that we keep
    Po> bumping into relics from over two decades ago, and using `select' might
    Po> very well be one of those.

Every platform has a replacement for `select', but theyʼre all
different. The only real issue I see with (p)select is that you canʼt
wait on more than FD_SETSIZE descriptors.

Robert
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