pgsql: Better error messages for short reads/writes in SLRU

From: Peter Eisentraut <peter(at)eisentraut(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Better error messages for short reads/writes in SLRU
Date: 2019-09-03 06:38:02
Message-ID: E1i52S2-00048n-De@gemulon.postgresql.org
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Better error messages for short reads/writes in SLRU

This avoids getting a

Could not read from file ...: Success.

for a short read or write (since errno is not set in that case).
Instead, report a more specific error messages.

Reviewed-by: Michael Paquier <michael(at)paquier(dot)xyz>
Discussion: https://www.postgresql.org/message-id/flat/5de61b6b-8be9-7771-0048-860328efe027%402ndquadrant.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/396e4afdbcbfd3398415f1a0a29668d6a24a2ddd

Modified Files
--------------
src/backend/access/transam/slru.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)

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