Terminates the process normally, performing the regular cleanup for terminating programs.
Normal program termination performs the following (in the same order):
*) Objects associated with the current thread with thread storage duration are destroyed (C++11 only).
*) Objects with static storage duration are destroyed (C++) and functions registered with atexit are called.
*) All C streams (open with functions in <cstdio>) are closed (and flushed, if buffered), and all files created with tmpfile are removed.
*) Control is returned to the host environment.
Note that objects with automatic storage are not destroyed by calling exit (C++).
If status is zero or EXIT_SUCCESS, a successful termination status is returned to the host environment.
If status is EXIT_FAILURE, an unsuccessful termination status is returned to the host environment.
Otherwise, the status returned depends on the system and library implementation.
For a similar function that does not perform the cleanup described above, see quick_exit.
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