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Re: [COMMITTERS] pgsql: Add GUC variables to control keep-alive

From: Oliver Jowett <oliver(at)opencloud(dot)com>
To: Larry Rosenman <ler(at)lerctr(dot)org>
Cc: 'Andrew Dunstan' <andrew(at)dunslane(dot)net>,'Bruce Momjian' <pgman(at)candle(dot)pha(dot)pa(dot)us>,'Rocco Altier' <RoccoA(at)Routescape(dot)com>,'PostgreSQL-development' <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [COMMITTERS] pgsql: Add GUC variables to control keep-alive
Date: 2005-07-31 00:41:56
Message-ID: 42EC1E54.5040808@opencloud.com (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
Larry Rosenman wrote:

> I think Tom's fix to use IPPROTO_TCP will fix firefly.

Ah, I forgot about the "we'll just use IP protocol numbers as socket
option levels" behaviour (BSD-derived?). My Linux man page only talks
about SOL_TCP, but I have run into this before and should have
remembered.. my bad.

per my linux/socket.h:

> /* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
> #define SOL_IP          0
> /* #define SOL_ICMP     1       No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
> #define SOL_TCP         6

(I won't get into why using wire-level-protocol constants for syscall
option numbering is a bad idea.. :)

-O

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