on_exit - register a function to be called at normal program termination.
#include <stdlib.h>
int on_exit(void (*function)(int , void *), void *arg);
The on_exit() function registers the given function to be called at
normal program termination, whether via exit(3) or via return from the
program's main. The function is passed the argument to exit(3) and the
arg argument from on_exit().
The on_exit() function returns the value 0 if successful; otherwise the
value -1 is returned.
atexit(3), exit(3)
GNU 1993-04-02 ON_EXIT(3)
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