The Set Fault Characteristic service sets the fault
    characteristics (for example, no execute) for the specified
    range of pages, checking that the specified mode is at least
    as privileged as the owner of the page.

    If the condition value SS$_ACCVIO is returned by this service, a
    value might not be returned in the memory locations pointed to by
    the return_va_64 and return_length_64 arguments.

    If a condition value other than SS$_ACCVIO is returned, the
    returned address and returned length indicate the pages that were
    successfully changed before the error occurred. If no pages were
    changed, the return_va_64 argument will contain the value -1, and
    a value might not be returned in the memory location pointed to
    by the return_length_64 argument.

    Required Privileges

    None

    Required Quota

    None

    Related Services

    $CRETVA_64, $EXPREG_64, $SETPRT_64