The function pointed by the function pointer argument is called when the program terminates normally.

If more than one atexit function has been specified by different calls to this function, they are all executed in reverse order as a stack, i.e. the last function specified is the first to be executed at exit.

One single function can be registered to be executed at exit more than once.

C++ implementations are required to support the registration of at least 32 atexit functions.

Parameters

function

Function to be called. The function has to return no value and accept no arguments.

Return Value

Example

/* atexit example */
            #include <stdio.h>
            #include <stdlib.h>
            void fnExit1 (void)
            {
            puts ("Exit function 1.");
            }
            void fnExit2 (void)
            {
            puts ("Exit function 2.");
            }
            int main ()
            {
            atexit (fnExit1);
            atexit (fnExit2);
            puts ("Main function.");
            return 0;
            }
            

Output:

Main function. Exit function 2. Exit function 1.