Serial number zero and sequence space arithmetic

Cricket Liu cricket at acmebw.com
Tue Jul 11 17:42:05 UTC 2000


> > It looks to me from the 4.9.3 source like sequence space
> > arithmetic came in at about 4.9.  (I don't have any 4.9 source
> > older than 4.9.3, and 4.8.3 doesn't appear to use sequence
> > space.)  Can anyone confirm this?
> 
> my oldest available copy is a snapshot of 4.9 dated 1993-02-02.
> Excerpt from that day's named-xfer.c:
> 
> /* compare using sequence space arithmetic */
> if (SEQ_GT(zp_start.z_serial, serial_no) || serial_no == 0) {

Excellent!  Thank you, Peter.  So sequence space did come in
at 4.9, because 4.8.3 doesn't have it.  I show serial 0 being
introduced at 4.8.1.  Now if I can just find out when serial 0
went away....

cricket




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