netdev - Re: Add a SOCK_DESTROY operation to close sockets from userspace

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Message-ID: <CAKD1Yr0Gpr6Ex2i1TXEWyETn48P4g5vBvFZ9=_g+Lz_7-PqBDQ@mail.gmail.com>
Date:	Wed, 18 Nov 2015 19:47:21 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Erik Kline <ek@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

On Wed, Nov 18, 2015 at 7:19 PM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> I bet there will soon be a timewaitd which handles the not configurable
> (David has rejected all those patches so far) timeout of TIME_WAIT
> sockets. And I bet it will be used. :/

No, SOCK_DESTROY has no effect on TCP_TIME_WAIT sockets or any other
non-full socket.

When called on any socket where sk_fullsock(sk) is false, it returns
EOPNOTSUPP because there is nothing to do. Its purpose is to interrupt
blocked userspace socket calls, not to release resources.
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