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

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