Don't use BLCKSZ for the physical length of the pg_control file, but

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e6140d90520eca4505d65557ea40369dcf0dec89
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-04-04T22:39:59Z
Releases: 8.2.0
Don't use BLCKSZ for the physical length of the pg_control file, but
instead a dedicated symbol.  This probably makes no functional difference
for likely values of BLCKSZ, but it makes the intent clearer.
Simon Riggs, minor editorialization by Tom Lane.

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