* These macros perform sequence number arithmetic modulo (2**7 or 2**31).
* The relevant fields in the tpcb are:
* tp_seqmask : the mask of bits that define the sequence space.
* These macros perform sequence number arithmetic modulo (2**7 or 2**31).
* The relevant fields in the tpcb are:
* tp_seqmask : the mask of bits that define the sequence space.