atexit 在函数正常退出时执行的函数注册

#include <stdio.h> #include <unistd.h>#include <stdlib.h>static void my_exit(void);int main(void){    if (atexit(my_exit) != 0)        printf("can't register my_exit");        printf("main is done\n");    return 0;}static void my_exit(void){    printf("Stuff print in my_exit\n");}