cygwin 1.5.3-1

[Ralf Habacker]

> Ralf --
>    What happens when you run your cygipc-based build of X11, but do not
> have the ipc-daemon running?  You can't run KDE, of course, but does the
> Xserver itself still work properly?  Can non-KDE X apps work?
>
Xfre has build in support for disabling XIT-SHM support in cases the kernel does
not support it.
See http://www.atomised.org/docs/XFree86-4.2.1/shm_8c-source.html

xc/programs/Xserver/xext/shm.c
<snip>

void
ShmExtensionInit()
{                                                                            
    ExtensionEntry *extEntry;                                                
    int i;                                                                   
                                                                             
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)      
    if (!CheckForShmSyscall())                                               
    {                                                                        
	ErrorF("MIT-SHM extension disabled due to lack of kernel support\n");      
	return;                                                                    
    }                                                                        
<snip>

Because the cypipc produces a valid return code ENOSYS in cases the ipc-daemon isn't available, 
see http://www.cygwin.com/ml/cygwin/2002-11/msg00136.html, there is only a simple checker functions needed to check the state of the ipc-daemon and enable/disable shm functions. 

The appended patch implemented this support for the xfree server. 

See the result: 

cd ~/src/xc/programs/Xserver
$ killall ipc-daemon 
$ ./XWin.exe &
$ xdpyinfo | grep MIT-SHM 

$ killall XWin 
$ ipc-daemon & 
$ ./XWin.exe &
$ xdpyinfo | grep MIT-SHM 
    MIT-SHM

Hope that helps 

cheers 
Ralf 


> --
> Chuck
> 
> 
> Harold L Hunt II wrote:
> 
> > Well, that makes it easy.  SHM will not be supported by this new build.
> > 
> > Harold
> > 
> > Christopher Faylor wrote:
> > 
> >> On Thu, Sep 04, 2003 at 04:45:34PM -0400, Harold L Hunt II wrote:
> >>
> >>> I am not sure.  How "automagically" is the IPC daemon installed?  If 
> >>> it requires user intervention, then we cannot really have XShm in the 
> >>> default install.
> >>
> >>
> >>
> >> You could make it a setup.hint dependency, of course, but that's only
> >> half the battle.  The next step would be to get the cygipc daemon
> >> started.  I don't think you want to go through that pain unless there is
> >> a clean fallback for when cygipc isn't working right.
> 
> 
> 
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