Signal

     # File lib/phusion_passenger/utils.rb, line 615
615:         def self.list_trappable
616:                 ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
617:                 case ruby_engine
618:                 when "ruby"
619:                         result = Signal.list
620:                         result.delete("ALRM")
621:                         result.delete("VTALRM")
622:                 when "jruby"
623:                         result = Signal.list
624:                         result.delete("QUIT")
625:                         result.delete("ILL")
626:                         result.delete("FPE")
627:                         result.delete("KILL")
628:                         result.delete("SEGV")
629:                         result.delete("USR1")
630:                 else
631:                         result = Signal.list
632:                 end
633:                 
634:                 # Don't touch SIGCHLD no matter what! On OS X waitpid() will
635:                 # malfunction if SIGCHLD doesn't have a correct handler.
636:                 result.delete("CLD")
637:                 result.delete("CHLD")
638:                 
639:                 # Other stuff that we don't want to trap no matter which
640:                 # Ruby engine.
641:                 result.delete("STOP")
642:                 
643:                 return result
644:         end