atexit - register a function to be called on exit
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;
value -1 is returned and the global variable errno is set to
[ENOMEM] No memory was available to add the function to
The existing list of functions is unmodified.
The atexit() function conforms to ANSI X3.159-1989 (``ANSI
OpenBSD 3.6 June 29, 1991
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