Allowing SYSV shared memory to allocated more than 2GB

[Matthew Dillon]

    No, I don't think type-munging for compatibility will work.  We should
    stick to the proper types.

    The ultimate solution to this sort of thing, e.g. for sysctls, would be
    to pass data in and out using ascii strings, but doing so would probably
    break a lot of pkgsrc and require us to implement dragonfly-specific
    ports instead of snarfing off the other BSD's ABIs.

						-Matt