static void my_exit1(void), my_exit2(void);int main(void){ printf ("main is begin\n"); if (atexit(my_exit2) != 0) { printf("can't register my_exit2"); exit(9); } if (atexit(my_exit1) != 0) { printf("can't register my_exit1"); exit(8); } if (atexit(my_exit1) != 0) { printf("can't register my_exit1"); exit(8); } printf("main is done\n"); return(0);}static void my_exit1(void){ printf("first exit handler\n");}static void my_exit2(void){ printf("second exit handler\n");}