oldsa            3706 gc/os_dep.c            struct sigaction sa, oldsa;
oldsa            3710 gc/os_dep.c            if(sigaction(SIGBUS,&sa,&oldsa) < 0) ABORT("sigaction");
oldsa            3711 gc/os_dep.c            GC_old_bus_handler = (SIG_PF)oldsa.sa_handler;