在main函数退出后执行其他函数 http://blog.chinaunix.net/uid-22332450-id-1775058.html

昨天有位朋友问：程序在执行完main函数后就要退出，如果想在main()函数执行完再运行

其他函数，该怎么做呢？

 

这种情况，是有可能遇到的。

 

我们这次就来看看这个问题！

C函数库为我们提供了一个函数atexit(),

该函数的原型为int atexit (void (*function)(void));定义在stdlib.h函数库中。

该函数用来设置一个程序正常结束前调用的函数。当程序调用exit()或从main中返回

时，参数function所指的函数就会被调用，在该函数返回后才会真正的退出。

函数atexit调用成功返回0，否则返回-1，可以再errno中查看错误信息。

                                               #include

                                               #include

                                               void function1(void),function2(void),function3(void),function4(void);

                                              

                                               int

                                               main(void)

                                               {

                                                        atexit(function1);

                                                        atexit(function2);

                                                        atexit(function3);

                                                        atexit(function4);

                                                        printf("注意啊，main函数马上就要结束啦！\n");

                                               }

                                               void

                                               function1(void){

                                                        printf("当前是function1函数\n");

                                               }

                                               void

                                               function2(void){

                                                        printf("当前是function2函数\n");

                                               }

                                               void

                                               function3(void){

                                                        printf("当前是function3函数\n");

                                               }

                                               void

                                               function4(void){

                                                        printf("当前是function4函数\n");

                                               }

 

可以看到用atexit注册的函数在执行时，和注册的顺序是相反的。

我们暂且先介绍这一个函数。

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