atexit函数的使用【学习笔记】

 1 #include "apue.h"
 2 
 3 static void my_exit1(void);
 4 static void my_exit2(void);
 5 
 6 
 7 int main(void)
 8 {
 9     int ret = -1;
10 
11     ret = atexit(my_exit2);
12     if(ret != 0)
13         err_sys("can't not register my_exit2
");
14 
15     ret = atexit(my_exit1);
16     if(ret != 0)
17         err_sys("can't not register my_exit1
");
18 
19     ret = atexit(my_exit1);
20     if(ret != 0)
21         err_sys("can't not register my_exit1
");
22 
23     printf("main done
");
24 
25     exit(0);
26 
27 }
28 
29 static void my_exit1(void)
30 {
31     printf("first exit handler
");
32 }
33 static void my_exit2(void)
34 {
35     printf("second exit handler
");
36 }