atexit - register a function to be called on exit
Standard C Library (libc, -lc)
The atexit() function registers the given function to be called at program
exit, whether via exit(3) or via return from the program's main.
Functions so registered are called in reverse order; no arguments are
passed. At least 32 functions can always be registered, and more are
allowed as long as sufficient memory can be allocated.
The atexit() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
[ENOMEM] No memory was available to add the function to the
list. The existing list of functions is unmodified.
The atexit() function conforms to ANSI X3.159-1989 (``ANSI C'').
BSD June 4, 1993 BSD
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