posix_signal      544 include/ruby/intern.h RETSIGTYPE (*posix_signal(int, RETSIGTYPE (*)(int)))(int);
posix_signal     2562 process.c      # define signal(a,b) posix_signal(a,b)
posix_signal      171 thread_pthread.c     posix_signal(SIGVTALRM, null_func);