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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