In some email I received from Greg A. Woods, sie wrote:
[...]
> (None of the standards I have access to document any other return
> values.  SunOS-4 documents EFAULT though I've never tested it....
> SunOS-5.6 does not document EFAULT.)

If you had of tested, you would have found the behaviour consistant
with that on NetBSD.  The only difference between Solaris, SunOS4 and
NetBSD is that the Solaris man page is more correct than either of
the other two.