Implementing dump(), getdump() with modStd()

If you are running modStd(), how can you tell the program to dump() the state once a day, and then getdump()? Ideally getdump() is best only if the program crashed, but it's fine every time that it dump() runs. Also, there is Linux SIGKILL, SIGTERM, SIGINT. Can they be used for dump(), getdump() ?