http://www.perlmonks.org?node_id=348373


in reply to Re: Re: receive siginfo for real time signals.
in thread receive siginfo for real time signals.

I'm afraid that question doesn't make a lot of sense to me. But if you're asking what I think you're asking: It's because signal handling for unsafe signals calls Perl subroutines, and for safe signals, it sets multiple flags checked during OP running.

    -- Chip Salzenberg, Free-Floating Agent of Chaos