old_segv_handler  706 gc/os_dep.c            static handler old_segv_handler, old_bus_handler;
old_segv_handler  747 gc/os_dep.c        	  old_segv_handler = signal(SIGSEGV, h);
old_segv_handler  782 gc/os_dep.c      	  (void) signal(SIGSEGV, old_segv_handler);