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Re: Problems with executing X11 programs via ssh

Hi Earl...

That looks like the problem I had. See my patch attached to the e-mail 

ssh hanging with -f option--a workaround (July 27, 2001).

on this list. This is not a proper is a workaround for what I 
believe is a Cygwin bug that shows up in a select call after forking.

I hope this helps. Let me (and the list) know if this fixes it for you.


>From: "Hood, Earl" <>
>Subject: Problems with executing X11 programs via ssh
>Date: Fri, 24 Aug 2001 17:59:51 -0500
>I just did an update of cygwin packages.  Now, the way I launch
>xterms from remote systems using X11 forwarding does not work
>properly.  For example, I have the following:
>	ssh -f -n hostname xterm
>I get prompted for my password, and after a little hesitation,
>ssh goes in the background, example:
>	cygwin<508> ssh -f -n xterm
>	user@hostname's password:
>	/usr/X11R6/bin/xauth: not found
>I've ignored the xauth not found message since it has no impact
>(at least before) since the xterm would popup on my display.
>The problem is that no xterm ever pops up, and the CPU usage on
>my NT systems spikes to 100%.  A process is listed for ssh under
>cygwin using ps and an xterm process is running under the remote
>machine I specified, but no xterm on my display.
>Now, if I do an interactive connect to the remote host, and then
>manually launch xterm, the xterm comes up okay.  The problem
>only occurs when I try to use the -f -n options.  Is this a known
>System Info:
>     WinNT Ver 4.0 build 1381 Service Pack 6
>     Cygwin DLL version info:
>         dll major: 1003
>         dll minor: 2
>         dll epoch: 19
>         dll bad signal mask: 19005
>         dll old termios: 5
>         dll malloc env: 28
>         api major: 0
>         api minor: 39
>         shared data: 3
>         dll identifier: cygwin1
>         mount registry: 2
>         cygnus registry name: Cygnus Solutions
>         cygwin registry name: Cygwin
>         program options name: Program Options
>         cygwin mount registry name: mounts v2
>         cygdrive flags: cygdrive flags
>         cygdrive prefix: cygdrive prefix
>         cygdrive default prefix:
>         build date: Sun May 20 23:28:17 EDT 2001
>         shared id: cygwin1S3
>     X11 Display Server: Exceed 6.2
>     openssh: 2.9p2-3
>     openssl: 0.9.6b1
>P.S.  Ssh also appears to fail the $HOME environment variable.
>It access the known_hosts and config file from /.ssh and from
>$HOME/.ssh.  I had to explicitly put is a home directory path
>in /etc/passwd.  Is this a cygwin quirk, or is the ssh manpage
>misleading when it uses $HOME when it really means the home
>directory of the user as specified in /etc/passwd?
>Earl W. Hood
>Texas Instruments
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