From: Florian Westphal <fw@strlen.de>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Florian Westphal <fw@strlen.de>,
David Miller <davem@davemloft.net>,
kaber@trash.net, netdev@vger.kernel.org
Subject: Re: [WTF?] random test in netlink_sendmsg()
Date: Fri, 12 Dec 2014 23:20:21 +0100 [thread overview]
Message-ID: <20141212222021.GC3624@breakpoint.cc> (raw)
In-Reply-To: <20141212221410.GF22149@ZenIV.linux.org.uk>
Al Viro <viro@ZenIV.linux.org.uk> wrote:
> On Fri, Dec 12, 2014 at 10:50:17PM +0100, Florian Westphal wrote:
>
> > > What do we want sendmsg(fd, &msg, 0) to do when fd is AF_NETLINK socket
> > > that had setsockopt(fd, SOL_NETLINK, NETLINK_TX_RING, ...) successfully done
> > > to it and msg.msg_iovlen is 0? Userland ABI question
> >
> > IIRC userland, after filling txring with at least one new netlink
> > message, needs to call this to tell kernel to start processing the
> > messages in the tx ring.
>
> AFAICS, the suggested way to initiate transmission is sendto(fd, NULL, 0, ...),
> not sendmsg(2).
Indeed, you're right.
next prev parent reply other threads:[~2014-12-12 22:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-28 6:23 [WTF?] random test in netlink_sendmsg() Al Viro
2014-12-12 20:34 ` David Miller
2014-12-12 21:32 ` Al Viro
2014-12-12 21:50 ` Florian Westphal
2014-12-12 22:14 ` Al Viro
2014-12-12 22:20 ` Florian Westphal [this message]
2014-12-13 1:07 ` David Miller
2014-12-13 1:54 ` Al Viro
2014-12-13 2:33 ` David Miller
2014-12-13 3:25 ` Al Viro
2014-12-13 4:51 ` Al Viro
2014-12-14 4:38 ` David Miller
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