add program termination routine
int atexit(void (func)(void));
atexit adds the function func to a list of functions to
be called without arguments on normal termination of the program.
Normal termination occurs by either a call to the exit
system call or a return from main.
At least 32 functions may be registered by atexit; the functions
will be called in the reverse order of their registration.
atexit returns 0 if the registration succeeds, nonzero if it fails.
If a signal is sent to a process that would have Exit or Core actions,
the functions registered with atexit are not called.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004