ruby_signal      327 signal.c           ruby_signal(signum, handler);
ruby_signal      383 signal.c           ruby_signal(sig, sighandler);
ruby_signal      591 signal.c           ruby_signal(sig, func);
ruby_signal      692 signal.c           old = ruby_signal(signum, handler);
ruby_signal      694 signal.c       	ruby_signal(signum, old);