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Re: How to get xdm working?


That is a pretty large and well-detailed request. Unfortunately, I don't know enough to answer your question. Perhaps someone else does... if not, it looks like you would be the one that knows the most about the subject (a position I often find myself in :).

Harold

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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