atexit()用于注册一个函数,告诉操作系统在
在软件退出的时候, 执行这个被注册的函数.
注册的函数原型是 void fn(void) , 即没有输入参数,没有返回值.
* ATEXIT.C: This program pushes four functions onto
* the stack of functions to be executed when atexit
* is called. When the program exits, these programs
* are executed on a "last in, first out" basis.
*/
#include <stdlib.h>
#include <stdio.h>
void fn1( void ), fn2( void ), fn3( void ), fn4( void );
void main( void )
{
atexit( fn1 );
atexit( fn2 );
atexit( fn3 );
atexit( fn4 );
printf( "This is executed first./n" );
}
void fn1()
{
printf( "next./n" );
}
void fn2()
{
printf( "executed " );
}
void fn3()
{
printf( "is " );
}
void fn4()
{
printf( "This " );
}
Output
This is executed first.
This is executed next.
