netdev - Re: shutdown()'s 'how' parameter doesn't seem to be used correctly

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Date:	Wed, 26 Feb 2014 08:39:23 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: shutdown()'s 'how' parameter doesn't seem to be used correctly

On Wed, 2014-02-26 at 15:18 +0000, David Laight wrote:
> AFAICT userspace calls shutdown(sock, how) with 'how' set to one of SHUT_RD (0),
> SHUT_WR (1) or SHUT_RDWR(2).
> 
> The kernel code typically wants the bitmask of RCV_SHUTDOWN (1) | SEND_SHUTDOWN (2).
> If you look at the af_unix.c unix_shutdown() there is a comment where it
> add's one in order to do the conversion.
> 
> But I can't find the conversion before tcp_shutdown() or sctp_shutdown()
> checks for 'how & SEND_SHUTDOWN'.
> Which implies that shutdown(sock, SHUT_WR) doesn't work.
> 
> What have I missed?
> Should I be passing 2 or 3 to a direct call to sock->ops->shutdown()?
> (We currently pass 2 - which does outward disconnect anyway).

Take a look at inet_shutdown()



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