atexit

The atexit function registers functions to be called when exit is called in normal program termination.

  extern "C" int atexit(void (* f)(void))

  extern "C++" int atexit(void (* f)(void)) 

If there is no handler for a thrown exception terminate is called. The registration of at least 32 functions is allowed.

• Functions registered with atexit are called in reverse order.
• A function registered with atexit before an object of static storage duration will not be called until the objects's destruction.
• A function registered with atexit after an object of static storage duration is initialized will be called before the object's destruction.

The atexit() function returns zero if the registration succeeds, non zero if it fails.