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");
}