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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