find_signal_handler.rb

require 'inline'

class SigHandler
  inline do |builder|
    builder.include '<signal.h>'
    builder.c '
	long address(){
		struct sigaction oldact;
		sigaction(SIGINT, NULL, &oldact);
		sigaction(SIGINT, &oldact, NULL);
		printf("SIGINT handler address: 0x%lx\n", (long) oldact.sa_sigaction);
		return (long) oldact.sa_sigaction;
	}
      '
  end
end

handler_address = SigHandler.new.address
#puts ObjectSpace._id2ref(handler_address)