atexit - register a function to be called at normal program termination.
#include <stdlib.h>
int atexit(void (*function)(void));
The atexit() function registers the given function to be called at normal
program termination, whether via exit(3) or via return from the
program's main. Functions so registered are called in the reverse
order of their registration; no arguments are passed.
The atexit() function returns the value 0 if successful; otherwise it
returns a nonzero value; errno is not set.
SVID 3, BSD 4.3, ISO 9899
exit(3), on_exit(3)
GNU 1997-09-14 ATEXIT(3)
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