Compare two sequence numbers, taking care of wraparounds. This function returns the difference between seqnum1 and seqnum2.
a sequence number
a negative value if seqnum1 is bigger than seqnum2, 0 if they are equal or a positive value if seqnum1 is smaller than segnum2.
Compare two sequence numbers, taking care of wraparounds. This function returns the difference between seqnum1 and seqnum2.