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Re: TCP keepalive support for libpq

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Magnus Hagander <magnus@hagander.net>, Fujii Masao <masao.fujii@gmail.com>, Euler Taveira de Oliveira <euler@timbira.com>, Marko Kreen <markokr@gmail.com>, Tollef Fog Heen <tollef.fog.heen@collabora.co.uk>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2010-06-22T19:28:21Z
Lists: pgsql-hackers

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On Tue, Jun 22, 2010 at 1:32 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> I don't think the burden of proof is on me to demonstrate that there's
> a case where this feature isn't available - we're usually quite
> reluctant to take advantage of platform-specific features unless we
> have strong evidence that they are fully portable across our entire
> set of supported platforms.

Either I'm doing something wrong, or this doesn't work on Fedora 12.
I can adjust the system-wide settings by writing to the /proc
filesystem, but setsockopt() blows up (setting keepalives is fine, but
changing the subsidiary parameters does not seem to work).

[rhaas@f12dev pgsql]$ uname -a
Linux f12dev 2.6.32.11-99.fc12.x86_64 #1 SMP Mon Apr 5 19:59:38 UTC
2010 x86_64 x86_64 x86_64 GNU/Linux
[rhaas@f12dev pgsql]$ psql -l 'keepalives_idle=30'
psql: setsockopt(TCP_KEEPIDLE) failed: Operation not supported
[rhaas@f12dev pgsql]$ psql -l 'keepalives_interval=10'
psql: setsockopt(TCP_KEEPINTVL) failed: Operation not supported
[rhaas@f12dev pgsql]$ psql -l 'keepalives_count=5'
psql: setsockopt(TCP_KEEPCNT) failed: Operation not supported

WIP patch attached, based on a previous version by Fujii Masao.  Note
that the same commands work OK on MacOS X 10.6.3.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
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