atexit函数的使用【学习笔记】

#include "apue.h"

static void my_exit1(void);
static void my_exit2(void);


int main(void)
{
    int ret = -1;

    ret = atexit(my_exit2);
    if(ret != 0)
        err_sys("can't not register my_exit2
");

    ret = atexit(my_exit1);
    if(ret != 0)
        err_sys("can't not register my_exit1
");

    ret = atexit(my_exit1);
    if(ret != 0)
        err_sys("can't not register my_exit1
");

    printf("main done
");

    exit(0);

}

static void my_exit1(void)
{
    printf("first exit handler
");
}
static void my_exit2(void)
{
    printf("second exit handler
");
}