Re: CreateFileMapping problem but Win32 error is 0

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Jul 18 22:41, Andrew DeFaria wrote:
> I am helping a client install a new server and we use a process that 
> essentially does an rsh <machine> make. The make process is fairly 
> complicated. The new server is a Windows 2003 Server. There is no RDP 
> involved - just an rsh. I'm getting errors like:
> 
>      3 [main] bash 14596 C:\cygwin\bin\bash.exe: *** fatal error - 
> C:\cygwin\bin\bash.exe: *** CreateFileMapping 
> Global\cygwin1S4.cygpid.4648, Win32 error 0. 
> 
> I've seen some posts regarding an error similar to this but it usually 
> involves and RDP session and an error code of 5 but here I have no RDP 
> session and the error code is strangely 0.
> 
> The other thing that is odd is that in the process of make some of the 
> compilations will fail as the above and others won't. IOW it's 
> intermittent. Also it's not always bash that dies. Sometimes it's make:
> 
>      4 [main] make (11352) C:\cygwin\bin\make.exe: *** fatal error - 
> C:   bin\make.exe: *** CreateFileMapping Global\cygwin1S4.cygpid.11352, 
> Win32   .  Terminating.
> 
> Since the return code is 0 the make continues onward obliviously.
> 
> Another interesting aspect is that if the user who is rsh'ing is added 
> to the local Administrators group then all these errors disappear.
> 
> Note that people have passwordless rsh access to the server.

This is probably the problem.  I just wrote a lengthy explanation of
what happens in case of public key authentication, see:

http://cygwin.com/ml/cygwin/2006-07/msg00577.html

You're getting the same problem in case of rhosts authentication, it
all boils down to "password-less authentication".

Your case is not exactly related but it doesn't hurt to read this first,
just to get an impression and maybe a coffee break.

I can't explain the error code 0 right now, but I assume your problem is
the handling of user rights related to global objects.  Reading
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/termserv/termserv/kernel_object_namespaces.asp
gives a bit of insight into the general problem.

I have to be able to reproduce the problem, which I can't ATM.
As a workaround try giving the "Create global objects" user right
to the sshd_server account alone.  If that doesn't work, add the
"Create global objects" right to the users login in through rsh.
Please report back the results of both tests.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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