signal_handler 21 gameio.c signal(SIGHUP, signal_handler); signal_handler 22 gameio.c signal(SIGINT, signal_handler); signal_handler 23 gameio.c signal(SIGILL, signal_handler); signal_handler 24 gameio.c signal(SIGTERM,signal_handler); signal_handler 25 gameio.c signal(SIGQUIT,signal_handler);