on_exit - register a function to be called at normal process termination
The on_exit() function registers the given
function to be called at normal process termination, whether via exit(3) or via return from the program's
function is passed the status argument given to the last call to exit(3) and the
arg argument from on_exit().
The same function may be registered multiple times: it is called once for each registration.
The on_exit() function returns the value 0 if successful; otherwise it returns a nonzero value.
This function comes from SunOS 4, but is also present in glibc. It no longer occurs in Solaris (SunOS 5). Portable application should avoid this function, and use the standard atexit(3) instead.
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