> this test has been in screen for a really long time and the behaviour
> it is expecting is on many platforms.  i'm curious why it's OK to
> change the definition of select() after so long?
> 
> it breaks old binaries at the very least, doesn't it?  that should be
> enough to revert to the old behaviour or some sort of versioning is
> required.

it didn't change the definition of select() at all.
what's changed is a socket default lowatermark.
it isn't new.  whenever you bump MCLSHIFT, you see the same situation.

YAMAMOTO Takashi