About your update in "Operating system" page
This is not that Oracle does not maintain the function, it does, but the information given is more for internal purpose.
For instance, on current Windows versions, the function returns "WIN_NT64", of course current Windows versions are no more NT but Oracle code is the one based on Windows NT technology, with a 64-bit specification.
"Linux-2.4.xx" means this is Oracle code developed for Linux 2.4 and the prefix "x86_64" means on x86 64-bit hardware.
In short, the function does not return the current OS version but the OS version on which Oracle core code was first developed.
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