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From: Dan Smith <danms@us.ibm.com>
To: Oren Laadan <orenl@librato.com>
Cc: containers@lists.osdl.org, Alexey Dobriyan <adobriyan@gmail.com>,
	netdev@vger.kernel.org
Subject: Re: [PATCH 5/5] c/r: Add AF_UNIX support (v6)
Date: Thu, 30 Jul 2009 08:49:57 -0700	[thread overview]
Message-ID: <878wi6yxui.fsf@caffeine.danplanet.com> (raw)
In-Reply-To: <4A6F6B19.9010508@librato.com> (Oren Laadan's message of "Tue\, 28 Jul 2009 17\:18\:17 -0400")

OL> Hmm.. then what happens when you have a circular dependency ?  For
OL> example, three dgram sockets, A, B and C where: A->B, B->C and
OL> C->A ('->' means connected).

So, I've been cooking up changes to the patch and a test for this
case.  However, it seems like it's not valid, unless I'm missing
something.  The man page for connect() says:

  If the socket sockfd is of type SOCK_DGRAM then serv_addr is the
  address to which datagrams are sent by default, and the only address
  from which datagrams are received.

So, even though you can connect() a DGRAM socket and then sendto()
datagrams to a different location, it doesn't appear that the
relationship between A and B is really valid, at least the connection
between A and B is not functional.  In fact, in my testing, if you try
to connect() C back to A, you get "Operation not permitted" because A
is already connected elsewhere.

Thoughts?

-- 
Dan Smith
IBM Linux Technology Center
email: danms@us.ibm.com

  parent reply	other threads:[~2009-07-30 15:49 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-07-22 20:41 Add Checkpoint/Restart support for UNIX sockets Dan Smith
     [not found] ` <1248295301-30930-1-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-07-22 20:41   ` [PATCH 1/5] Add _ckpt_read_hdr_type() helper Dan Smith
     [not found]     ` <1248295301-30930-2-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-07-23  3:59       ` Oren Laadan
     [not found]         ` <4A67E027.1050602-eQaUEPhvms7ENvBUuze7eA@public.gmane.org>
2009-07-23 16:43           ` Dan Smith
2009-07-22 20:41   ` [PATCH 2/5] Add an errno validation function Dan Smith
     [not found]     ` <1248295301-30930-3-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-07-23  3:17       ` Oren Laadan
     [not found]         ` <4A67D654.2000206-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-07-23 15:40           ` Dan Smith
2009-07-22 20:41   ` [PATCH 3/5] Add a ckpt_read_string() function to allow reading of a variable-length (but length-capped) string from the checkpoint stream Dan Smith
     [not found]     ` <1248295301-30930-4-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-07-23  4:19       ` Oren Laadan
     [not found]         ` <4A67E4EC.3070509-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-07-23 16:58           ` Dan Smith
     [not found]             ` <87y6qfnxoq.fsf-FLMGYpZoEPULwtHQx/6qkW3U47Q5hpJU@public.gmane.org>
2009-07-24  1:32               ` Oren Laadan
2009-07-22 20:41   ` [PATCH 4/5] Add a common sock_bind() helper to unify the security hook Dan Smith
2009-07-22 20:41 ` [PATCH 5/5] c/r: Add AF_UNIX support (v6) Dan Smith
     [not found]   ` <1248295301-30930-6-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-07-28 16:54     ` Oren Laadan
2009-07-28 20:34       ` Dan Smith
2009-07-28 21:18         ` Oren Laadan
2009-07-29 13:36           ` Serge E. Hallyn
2009-07-29 14:49             ` Dan Smith
2009-07-29 14:59               ` Serge E. Hallyn
2009-07-29 15:03                 ` Dan Smith
2009-07-29 15:34             ` Oren Laadan
2009-07-29 18:37           ` Dan Smith
2009-07-30 15:49           ` Dan Smith [this message]
2009-07-30 22:10             ` John Dykstra
2009-07-30 22:12               ` John Dykstra
2009-07-30 22:14                 ` Dan Smith
2009-08-04  8:27             ` Oren Laadan
2009-08-04 15:16               ` Dan Smith
2009-08-04 17:05                 ` Oren Laadan
2009-08-04 17:13                   ` Dan Smith
2009-07-29  1:56         ` Serge E. Hallyn

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