It seems to say that it's possible for select not to return (with EINTR or otherwise) on SIGCHLD. If that's true, then yes, it affects Perl. Keep in mind the reference was written in 1992, a lifetime ago, so it may no longer apply.

Note that the self-pipe trick won't work in Perl (when using safe signals). The signal handler can't cause select to return because the signal handler only get executed after select returns.

In reply to Re: "self-pipe trick" needed with perl? by ikegami
in thread "self-pipe trick" needed with perl? by perl5ever

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