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Message-ID:	<4BB5F03D.9090209@shaddybaddah.name>
Date:	Fri, 02 Apr 2010 13:25:17 +0000
From:	Shaddy Baddah <helium AT shaddybaddah DOT name>
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To:	cygwin AT cygwin DOT com
Subject:	Re: tty initialization failure under cygwin 1.7.2?
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Hi,

On 2/04/2010 11:36 AM, Corinna Vinschen wrote:
> On Apr  1 14:31, Eric Berge wrote:
>    
>>
>> I recently updated to 1.7.2 from 1.7.1 with the March 15 development
>> patch and noticed I was getting some process failures.  In particular
>> I was running the Coverity static analysis tool, and was getting an
>> error about not being able to "initialize fd 0 for /dev/tty0".
>>
>> This problem does not appear to occur with remote desktop, just with
>> ssh.
>>
>> I've been searching around for a simpler version of the problem
>> and this is what I found:
>>
>> The test scenario is to do the following:
>>
>> 1. ssh into an cygwin sshd server with an explicit password
>> 2. Run "cmd"
>> 3. From "cmd" run "ls"
>>
>> I unfortunately no longer have the 1.7.1 + Mar15 patch running but
>> with cygwin 1.5 and running "ls" lists the entries of the directory
>> as expected.  However, running on 1.7.2 has the following output:
>>
>> C:\cygwin\home\eberge>ls
>> ls
>>       12 [main] ls 3984 C:\cygwin\bin\ls.exe: *** fatal error - couldn't initialize fd 0 for /dev/tty0
>>
>> C:\cygwin\home\eberge>
>>
>> I hope this is reflective of the problem I had with Coverity.  It is
>> the same error message at least.  Is this indicative of an underlying
>> problem in 1.7.2 or is this related to any sort of reconfiguration I
>> need to do on my box after updating to 1.7.2?
>>      
> I'm wondering if that's a side effect with some other software.  I can
> not reproduce your problem.  I tried your test scenario and it works for
> me.  I don't get any weird error from ls.
>    

I suspect this is related to the same issue, related to user
privilege, that I described in
http://cygwin.com/ml/cygwin-developers/2010-02/msg00005.html. As I
understood it from that bit of debug (which I have not returned to
btw), it boils down to an OS limitation preventing Cygwin from
emulating the correct permissions of a tty device. ie. the tty device
appears to be owned by the user, but the tty master is in fact
owned/permed as the SYSTEM(like) user of the sshd session
process. Only Administrators can get at it (with the underlying
OpenProcess() call).

I would have expected this to occur with 1.7.1 as well though.

Is that accurate?

Regards,
Shaddy


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