PM_GET_SYSTEM_THRESHOLD
pm_ret = ioctl (pm_fd, PM_GET_SYSTEM_THRESHOLD);
{ (uint_t)PM_GET_SYSTEM_THRESHOLD, "PM_GET_SYSTEM_THRESHOLD",
case PM_GET_SYSTEM_THRESHOLD:
{PM_GET_SYSTEM_THRESHOLD, "PM_GET_SYSTEM_THRESHOLD", 1, NOSTRUCT},