Has anyone run xdm successfully under cygwin?

[pbs <pnews at tiscali dot co dot uk>]

I have come back to this problem and have messed around with xdm on a
Windows XP home edition using Cygwin 1.5.24(0.156/4/2). It still has
similar problems to those I experienced back in 2003. So in the interim
has anyone successfully run the program?

On this attempt I am running it on a local disk.
	X -indirect hostname
works like expected. (so it is not a comms problems)

When I run xdm I run it is in an account with the uid set to 0 (so xdm
thinks it is running as root). The problems I am getting are similar to
those I got back in 2003. Running xdm in strace allows it to get the
Xlogin screen (which still uses the password field in the /etc/password
file). I have fixed the winXP NT permissions problems that occur if one
logs in as a different user (but for testing purposes I login to the
same account as that which initiates xdm process. It will execute the
files in ~/.xsession. But on exiting those programs instead of returning
to a xlogin screen (or a chooser screen) it returns to a blank cross
hatch default X windows screen with no application running.

Using tcpdump on another machine I can see no evidence that chooser.exe
has been started (even though I have changed /etc/X11/Xaccess to  "*
CHOOSER BROADCAST" and I still have the problem of it not working at all
unless it is run in strace
strace xdm -nodeamon -debug 10

So my questions are:
1) Has anyone run xdm successfully under Cygwin?
2) If so any tips for how I can get it to work?


pnews@lomarline.freeserve.co.uk wrote:
> CYGWIN_95-4.0 myhost 1.5.3(0.90/3/2) 2003-09-01 13:15 i586 unknown
> unknown Cygwin
> 
> I am running these tests on a Samba partition which is mounted
> on the F: drive.
> 
> I can make an XDMCP connection using startxdmcp.bat or the command line
> Xwin.exe -query remotehost. (Having learnt to mount the /tmp as a bin
> type mount! )
> 
> This works fine and I can get the indirect list of machines on my net
> served up to me via the remotename machine. Connect to that machine
> and get the remote xdm to give me a login prompt.
> 
> Is it possible set up cywin to run the equivalent of my Linux Boxes'
> inittab lines:
>   x1:5:respawn:/usr/X11/bin/X -indirect thislocalhost
>   x2:5:respawn:/etc/X11/xdm -nodaemon
> 
> I have tried to do this in two ways:
> The first is to run xdm without removing the line in 
> /etc/xdm/Xservers specifying the server name:
>   :0 local /usr/X11R6/bin/X
> Infact I modified this to:
>  localhost:0 local /usr/X11R6/bin/X
> Because I needed that name to fix the "auth" problem. (see below)
> 
> I could then run xdm from the command line. It returns:
>   "Only root wants to run xdm"
> I worked around this in one of two ways:
> either running "xdm -debug 10"
> or creating a root account and logging in as root.
> 
> The other files I altered were all in /etc/X11/xdm
> Xaccess
>   *                   #any host can get a login window
>   * CHOOSER BROADCAST #any indirect host can get a chooser
> 
> xdm-config
>   !DisplayManager.errorLogFile:  /var/log/xdm.log
>   DisplayManager.errorLogFile:  /tmp/xdm.log
> 
>   ! removing this makes life simpler for now
>   ! DisplayManager.willing:             su nobody -c /usr/X11R6/lib/X11/xdm/Xwilling
> 
>   DisplayManager.*.authFile:    Xauthority
>   DisplayManager.RandomFile:            /tmp/XWin.log
> 
>   !DisplayManager.requestPort:     0
> 
> Some comments on the above. I changed the errorLogFile so that
> I did not have to monitor logs in more than one dir.
> 
> I removed the su "nobody -c" because it just complicates things!
> Removing the whole line saves running a script which includes
> programs which do not exist on my installation of cygwin.
> 
> I created an "Xauthority" file because the one generated by xdm
> has a colon in it and the file system barfs at that. When
> creating the entries for the Xauthority file I used a modified
> version of the which appeared in May 2002 in this mail list:
>    XAUTHORITY=/usr/X11R6/lib/X11/xdm/authdir/authfiles/Xauthority
>    DISPLAYNUM=:0
>    mcookie=`dd if=/dev/urandom count=1 | md5sum | cut -f1 -d\ '`
>    xauth -f "$XAUTHORITY" -v add "$DISPLAYNUM" . "$mcookie"
>    xauth -f "$XAUTHORITY" -v add "127.0.0.1$DISPLAYNUM" . "$mcookie"
>    xauth -f "$XAUTHORITY" -v add "$HOSTNAME$DISPLAYNUM" . "$mcookie"
> NB; For belt and braces I mounted the file "authfiles" dir as type bin.
> This is why I changed the line in the Xserver file to include localhost as 
> this script generates that entry:
>   $ xauth list
>   myhost/unix:0  MIT-MAGIC-COOKIE-1  7042...fc
>   localhost:0  MIT-MAGIC-COOKIE-1   7042...fc
>   myhost.mydomain.com:0  MIT-MAGIC-COOKIE-1  7042...fc
> 
> DM.RandomFile was used because the default is /dev/mem which does not
> appear to exist. I would be grateful for a better solution than the
> log file as a file for "sum".
> 
> DM.requestPort is commented out because I want other machines to get XDMCP 
> messages from this machine.
> 
> If I run xdm with the Xservers commented out and from separate
> window with the line: "Xwin -indirect myhost"
> The host name appears in the indirect list on a Linux machine.
> But when I connect to it I get a grey cross hatched screen
> and nothing else. The same is true for the local X screen.
> At the same time as the cross hatch appears xdm "core dumps"
> 
> Whether I run "xdm -debug 10" as root or another user whether there is
> an entry in Xserver or chooser or xterm inplace of chooser
> xdm always "core dumps" usually with the  KERNEL32.DLL or less often
> CYGWIN1.DLL depending on the settings in xdm-config
> 
> I noted the entry 2003/7/102 that other have been doing far more work
> on his than I have. Has anyone got a version which runs (with the release
> which I am using) and if so what am I doing that is not correct?
> 
> Two useful mail list refrences:
> http://cygwin.com/ml/cygwin-xfree/2003-07/msg00102.html
> http://sources.redhat.com/ml/cygwin-xfree/2002-05/msg00226.html
> 
> Here is one example of a dump cut from the popup window.
> XDM caused an invalid page fault in
> module KERNEL32.DLL at 0137:bff85fe5.
> Registers:
> EAX=c0013f4c CS=0137 EIP=bff85fe5 EFLGS=00010202
> EBX=8160e5a0 SS=013f ESP=006d0000 EBP=006d009c
> ECX=c0013f48 DS=013f ESI=006d00d0 FS=2877
> EDX=006d01f8 ES=013f EDI=006d00b4 GS=0000
> Bytes at CS:EIP:
> 57 8b 30 55 83 7e 54 00 0f 84 1c 01 00 00 f6 46 
> Stack dump:
> 006d00d0 006cda98 00000000 bff85812
> 00000001 0000000e 006d00b4 006d00d0
> 006d0300 0000000b 006cda98
> 00000000 00000000 00000000 00000000
> 00000000
> 
> Here is a example taken from the XDM.EXE.stackdump
> 
> Excption: STATUS_ACCESS_VIOLATION at eip=610788D1
> eax=20202020 ebx=008CF380 ecx=61621714 edx=61621718 esi=00000039 edi=FFFFFFFF
> ebp=008CF3A8 esp=008CF340 program=F:\CYGWIN\USR\X11R6\BIN\XDM.EXE
> cs=0137 ds=013F es=013F fs=25AF gs=0000 ss=013F
> Stack trace:
> Frame     Function  Args
> 008CF3A8  610788D1  (00000001, 008CF3C0, 00000001, 008CF400)
> 008CF3C8  6107826C  (00000001, 008CF3E0, 00000039, 008CF7F4)
> 008CF7E8  00406800  (00408F96, 10036218, 00000000, 00000001)
> 008CF808  0040905E  (10038CE8, 00000000, 00000000, 001282E1)
> 008CF838  00408D38  (10038CE8, 10036340, 00000001, 610773D0)
> 008CF858  00405E09  (10038CE8, 10036260, 10038DD8, 008CF8A4)
> 008CF8B8  0040C950  (008CF8E0, 00000010, 00000017, 00000017)
> 008CF908  0040B2A3  (0040B300, 00000001, 00000000, 00000000)
> 008CF938  0040B431  (00000014, 004051D0, 00000000, 00000000)
> 008CFD68  00404B4D  (00000003, 6162201C, 10030330, 008CFD9C)
> 008CFDB8  61004D8A  (610D0EE8, FFFFFFFE, 00000005, 610D0E0C)
> 008CFE08  6100507D  (00000000, 00000000, BFFBFA00, 008CFF68)
> 008CFE28  00453D82  (00404910, 037F0500, 008CFF78, BFF88E93)
> 008CFE38  0040103C  (8161F5AC, 8162A27C, 006C0000, 006D6458)
> 008CFF78  BFF88E93  (BFF88A87, 00000019, 8161F5AC, 00000000)
> 
> 
> --
> Regards Philip
> 


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