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Apparently "Unix" means "Linux" as the way this can be implemented varies from Unix to Unix.

Actually the introduction of this in the kernel back in '97 or so caused the company I was working for a lot of grief, and a quick recompile, since after a kernel upgrade the binaries we supplied were no longer working reliably.

I should say, Unix in this context means any Unix-like system that Factor runs on (Linux, FreeBSD, OpenBSD, Mac OS X)

There are several claims made in the article, and I'm skeptical that all of those things are completely true for all of those.

Each one is true for at least one of those platforms.

POSIX.1 , according to my signal(7).