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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.