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From:	Michael Wild <themiwi AT gmail DOT com>
Date:	Fri, 6 Jun 2014 07:22:07 +0200
Message-ID:	<CAALQ5rm6XmxNMeajo88hvQBWpULSOrC-P=fRJ2Wc-_kj51T2cg@mail.gmail.com>
Subject:	Re: tmux failed and got the message: failed to connect to server: No error
To:	cygwin AT cygwin DOT com
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On Mon, Jun 2, 2014 at 5:27 PM, Robert Pendell wrote:
> On Mon, Jun 2, 2014 at 4:37 AM, Michael Wild <> wrote:
>> Hi Guan-Zhong
>>
>> The problem is known upstream [1, 2] and I'm also trying to figure out
>> which change in the cygwin DLL triggered this issue. I'll post here
>> again once I know more.
>>
>> Michael
>>
>> [1] http://sourceforge.net/p/tmux/mailman/message/32396655/
>> [2] http://sourceforge.net/p/tmux/mailman/message/32400834/
>>
>> On Sat, May 31, 2014 at 5:29 PM, Guan-Zhong Huang wrote:
>>> cygwin-1.7.29-2 is ok.
>>> After updating to cygwin-1.7.30-1, I can't start tmux.
>>>
>>> I find it is because when tmux tries to connect to the unix domain
>>> socket that tmux server listens and tmux server hasn't started yet,
>>> connect() fails but errno is 0, not "Connection Refused (111)". This
>>> causes tmux to exit with error.
>>>
>>> If you want to reproduce this bug.
>>> tmux might work at the first time because the unix domain socket is not created.
>>> But after that, tmux will fail due to incorrect errno.
>>>
>>> Here's the strace I got:
>>> cygwin-1.7.30-1:
>>>    96 1063224 [main] tmux 4072 cygwin_connect: -1 = connect(5,
>>> 0x229780, 24), errno 0
>>> cygwin-1.7.29-2:
>>>    92 1054064 [main] tmux 3548 cygwin_connect: -1 = connect(5,
>>> 0x229780, 24), errno 111
>>>
>>>
>>> Best regads,
>>> Guan-Zhong
>
> I took a look and ran through some snapshots.  I remembered a
> discussion last month regarding the propogation of socket errors to
> dup'd sockets.  It seems the patch (or something commited at the same
> time) broke this as on the 4/18 snapshot all works well and it breaks
> on the 4/24 snapshot which is the same one that got that last bit
> patched.  I do not know if the patch was ever tested as the OP of that
> thread never responded from what I can tell.
>
> I tested on x86 only as my x86_64 install is running May 23rd snapshot
> and for some reason trying to go to an older snapshot resulted in an
> unusable install so I reinstalled my x86 one in order to test the
> older snapshot releases.
>
> Thread: https://cygwin.com/ml/cygwin/2014-04/msg00539.html
>
> Robert Pendell
> A perfect world is one of chaos.


Yesterday I uploaded tmux-1.9a-2 which papers over this issue:
https://cygwin.com/ml/cygwin-apps/2014-06/msg00018.html

Michael

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