From: Alan Burlison <Alan.Burlison@oracle.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
Stephen Hemminger <stephen@networkplumber.org>,
netdev@vger.kernel.org, dholland-tech@netbsd.org,
Casper Dik <casper.dik@oracle.com>
Subject: Re: Fw: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3)
Date: Wed, 21 Oct 2015 23:28:34 +0100 [thread overview]
Message-ID: <56281192.20606@oracle.com> (raw)
In-Reply-To: <20151021185104.GM22011@ZenIV.linux.org.uk>
On 21/10/2015 19:51, Al Viro wrote:
> BTW, is SCM_RIGHTS outside of scope? They do mention it in one place
> only:
> | Ancillary data is also possible at the socket level. The <sys/socket.h>
> | header shall define the following symbolic constant for use as the cmsg_type
> | value when cmsg_level is SOL_SOCKET:
> |
> | SCM_RIGHTS
> | Indicates that the data array contains the access rights to be sent or
> | received.
That's still exactly the same in Issue 7, Technical Corrigenda 2 which
is in final review at the moment.
>>> In other words, is that destruction of
>>> * any descriptor refering to this socket [utterly insane for obvious
>>> reasons]
>>> * the last descriptor refering to this socket (modulo descriptor
>>> passing, etc.) [a bitch to implement, unless we treat a syscall in progress
>>> as keeping the opened file open], or
>>> * _the_ descriptor used to issue accept(2) [a bitch to implement,
>>> with a lot of fun races in an already race-prone area]?
>>
>> From reading the POSIX close() page I believe the second option is
>> the correct one.
>
> Er... So fd2 = dup(fd);accept(fd)/close(fd) should *not* trigger that
> behaviour, in your opinion? Because fd is sure as hell not the last
> descriptor refering to that socket - fd2 remains alive and well.
>
> Behaviour you describe below matches the _third_ option.
Ah, I wasn't 100% sure what the intended difference between #2 and #3
was TBH, it does sound like I meant #3, yes :-)
--
Alan Burlison
--
next prev parent reply other threads:[~2015-10-21 22:28 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 16:59 Fw: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3) Stephen Hemminger
2015-10-19 23:33 ` Eric Dumazet
2015-10-20 1:12 ` Alan Burlison
2015-10-20 1:45 ` Eric Dumazet
2015-10-20 9:59 ` Alan Burlison
2015-10-20 11:24 ` David Miller
2015-10-20 11:39 ` Alan Burlison
2015-10-20 13:19 ` Fw: " Eric Dumazet
2015-10-20 13:45 ` Alan Burlison
2015-10-20 15:30 ` Eric Dumazet
2015-10-20 18:31 ` Alan Burlison
2015-10-20 18:42 ` Eric Dumazet
2015-10-21 10:25 ` David Laight
2015-10-21 10:49 ` Alan Burlison
2015-10-21 11:28 ` Eric Dumazet
2015-10-21 13:03 ` Alan Burlison
2015-10-21 13:29 ` Eric Dumazet
2015-10-21 3:49 ` Al Viro
2015-10-21 14:38 ` Alan Burlison
2015-10-21 15:30 ` David Miller
2015-10-21 16:04 ` Casper.Dik
2015-10-21 21:18 ` Eric Dumazet
2015-10-21 21:28 ` Al Viro
2015-10-21 16:32 ` Fw: " Eric Dumazet
2015-10-21 18:51 ` Al Viro
2015-10-21 20:33 ` Casper.Dik
2015-10-22 4:21 ` Al Viro
2015-10-22 10:55 ` Alan Burlison
2015-10-22 18:16 ` Al Viro
2015-10-22 20:15 ` Alan Burlison
2015-11-02 10:03 ` David Laight
2015-11-02 10:29 ` Al Viro
2015-10-21 22:28 ` Alan Burlison [this message]
2015-10-22 1:29 ` David Miller
2015-10-22 4:17 ` Alan Burlison
2015-10-22 4:44 ` Al Viro
2015-10-22 6:03 ` Al Viro
2015-10-22 6:34 ` Casper.Dik
2015-10-22 17:21 ` Al Viro
2015-10-22 18:24 ` Casper.Dik
2015-10-22 19:07 ` Al Viro
2015-10-22 19:51 ` Casper.Dik
2015-10-22 21:57 ` Al Viro
2015-10-23 9:52 ` Casper.Dik
2015-10-23 13:02 ` Eric Dumazet
2015-10-23 13:20 ` Casper.Dik
2015-10-23 13:48 ` Eric Dumazet
2015-10-23 14:13 ` Eric Dumazet
2015-10-23 13:35 ` Alan Burlison
2015-10-23 14:21 ` Eric Dumazet
2015-10-23 15:46 ` Alan Burlison
2015-10-23 16:00 ` Eric Dumazet
2015-10-23 16:07 ` Alan Burlison
2015-10-23 16:19 ` Eric Dumazet
2015-10-23 16:40 ` Alan Burlison
2015-10-23 17:47 ` Eric Dumazet
2015-10-23 17:59 ` [PATCH net-next] af_unix: do not report POLLOUT on listeners Eric Dumazet
2015-10-25 13:45 ` David Miller
2015-10-24 2:30 ` [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3) Al Viro
2015-10-27 9:08 ` Casper.Dik
2015-10-27 10:52 ` Alan Burlison
2015-10-27 12:01 ` Eric Dumazet
2015-10-27 12:27 ` Alan Burlison
2015-10-27 12:44 ` Eric Dumazet
2015-10-27 13:42 ` David Miller
2015-10-27 13:37 ` Alan Burlison
2015-10-27 13:59 ` David Miller
2015-10-27 14:13 ` Alan Burlison
2015-10-27 14:39 ` David Miller
2015-10-27 14:39 ` Alan Burlison
2015-10-27 15:04 ` David Miller
2015-10-27 15:53 ` Alan Burlison
2015-10-27 23:17 ` Al Viro
2015-10-28 0:13 ` Eric Dumazet
2015-10-28 12:35 ` Al Viro
2015-10-28 13:24 ` Eric Dumazet
2015-10-28 14:47 ` Eric Dumazet
2015-10-28 21:13 ` Al Viro
2015-10-28 21:44 ` Eric Dumazet
2015-10-28 22:33 ` Al Viro
2015-10-28 23:08 ` Eric Dumazet
2015-10-29 0:15 ` Al Viro
2015-10-29 3:29 ` Eric Dumazet
2015-10-29 4:16 ` Al Viro
2015-10-29 12:35 ` Eric Dumazet
2015-10-29 13:48 ` Eric Dumazet
2015-10-30 17:18 ` Linus Torvalds
2015-10-30 21:02 ` Al Viro
2015-10-30 21:23 ` Linus Torvalds
2015-10-30 21:50 ` Linus Torvalds
2015-10-30 22:33 ` Al Viro
2015-10-30 23:52 ` Linus Torvalds
2015-10-31 0:09 ` Al Viro
2015-10-31 15:59 ` Eric Dumazet
2015-10-31 19:34 ` Al Viro
2015-10-31 19:54 ` Linus Torvalds
2015-10-31 20:29 ` Al Viro
2015-11-02 0:24 ` Al Viro
2015-11-02 0:59 ` Linus Torvalds
2015-11-02 2:14 ` Eric Dumazet
2015-11-02 6:22 ` Al Viro
2015-10-31 20:45 ` Eric Dumazet
2015-10-31 21:23 ` Linus Torvalds
2015-10-31 21:51 ` Al Viro
2015-10-31 22:34 ` Eric Dumazet
2015-10-31 1:07 ` Eric Dumazet
2015-10-28 16:04 ` Alan Burlison
2015-10-29 14:58 ` David Holland
2015-10-29 15:18 ` Alan Burlison
2015-10-29 16:01 ` David Holland
2015-10-29 16:15 ` Alan Burlison
2015-10-29 17:07 ` Al Viro
2015-10-29 17:12 ` Alan Burlison
2015-10-30 1:54 ` David Miller
2015-10-30 1:55 ` David Miller
2015-10-30 5:44 ` David Holland
2015-10-30 17:43 ` David Laight
2015-10-30 21:09 ` Al Viro
2015-11-04 15:54 ` David Laight
2015-11-04 16:27 ` Al Viro
2015-11-06 15:07 ` David Laight
2015-11-06 19:31 ` Al Viro
2015-10-22 6:51 ` Casper.Dik
2015-10-22 11:18 ` Alan Burlison
2015-10-22 11:15 ` Alan Burlison
2015-10-22 6:15 ` Casper.Dik
2015-10-22 11:30 ` Eric Dumazet
2015-10-22 11:58 ` Alan Burlison
2015-10-22 12:10 ` Eric Dumazet
2015-10-22 13:12 ` David Miller
2015-10-22 13:14 ` Alan Burlison
2015-10-22 17:05 ` Al Viro
2015-10-22 17:39 ` Alan Burlison
2015-10-22 18:56 ` Al Viro
2015-10-22 19:50 ` Casper.Dik
2015-10-23 17:09 ` Al Viro
2015-10-23 18:30 ` Fw: " David Holland
2015-10-23 19:51 ` Al Viro
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