netdev - Re: [RFC] nasty corner case in unix_dgram

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Date:   Tue, 26 Feb 2019 15:31:32 +0000
From:   Rainer Weikusat <rweikusat@...ktalk.net>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Jason Baron <jbaron@...mai.com>, netdev@...r.kernel.org
Subject: Re: [RFC] nasty corner case in unix_dgram_sendmsg()

Al Viro <viro@...iv.linux.org.uk> writes:
> On Tue, Feb 26, 2019 at 06:28:17AM +0000, Al Viro wrote:

[...]


>> 	* if after relocking we see that unix_peer(sk) now
>> is equal to other, we arrange for wakeup forwarding from other's
>> peer_wait *and* if that has (likely) succeeded we fail with -EAGAIN.
>> Huh?

This returns 1 if sending isn't possible at the moment, ie, if the
process which tries to send has to wait.