exit - cause normal program termination
void exit(int status);
The exit() function causes normal program termination and the value of
status is returned to the parent. All functions registered with
atexit() and on_exit() are called in the reverse order of their registration,
and all open streams are flushed and closed.
The exit() function does not return.
SVID 3, POSIX, BSD 4.3, ISO 9899
_exit(2), atexit(3), on_exit(3)
GNU 1993-04-02 EXIT(3)
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