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

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Date:	Thu, 19 Nov 2015 13:29:18 -0800
From:	Tom Herbert <tom@...bertland.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	zenczykowski <zenczykowski@...il.com>,
	Lorenzo Colitti <lorenzo@...gle.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Erik Kline <ek@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

> We (TCP stack) compete with QUIC, based on UDP, which has no issues like
> that. We need to allow TCP sessions being signaled of a non temporary
> network disruption.
>

Eric, can you provide some detail on this statement?

I don't understand why QUIC wouldn't have this same issue. Seems like
it is still connection oriented just like TCP, so if the application
does a read expecting data from a peer and reverse reachability is
lost, the the read on the socket hang just like reading a TCP would.
If this is true, then the TCP solution would might actually be a
better since it allows a means for a third party (presumably a daemon
monitoring the network) to signal the application via closing specific
TCP sockets. I don't see how this could work in UDP especially if
these are unconnected sockets. What am I missing?

Thanks,
Tom
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