rb_sigaltstack_size 2322 gc.c           	th->altstack = malloc(rb_sigaltstack_size());
rb_sigaltstack_size 1315 internal.h     int rb_sigaltstack_size(void);
rb_sigaltstack_size  578 signal.c           newSS.ss_size = rb_sigaltstack_size();
rb_sigaltstack_size 2379 vm.c               th->altstack = malloc(rb_sigaltstack_size());