setting the signal is not enough, we must also check that the process we
expect to be parent to actually *is* our parent, not another process (eg
init if the daemon exited). we also have to set the death signal *after*
all set[ug]id calls, otherwise it will be cleared again by such changes.
Change-Id: I4e8c9102ea407576ed85b3203c8bb9bfb56762de
eldritch horrors
dd54f45bc7