Re: X11 capturing DISPLAY value
On 10/03/2013 22:17, wynfi...@gmail.com wrote: I wanted to capture the X11 DISPLAY value that shows on the console when 'startx ' in invoked and successful. I've tried: startx 21 | grep DISPLAY\= /tmp/xwin.txt startx 21 | grep DISPLAY /tmp/xwin.txt but neither worked. I could check files in /tmp/.X11-unix/* for date, owner, etc, and hope that the newest one is the right one and extract the number from the name, however if another user started an X window in the meantime I'd get the wrong DISPLAY v alue. Is there a preferred standard way to get this value? If you cannot explicitly specify a display number, I would say, use the '-displayfd' X server option [1], for example: xinit -- -displayfd 3 3~/.display export DISPLAY=:`cat ~/.display` Unfortunately, while this works with xinit, it seems there are bugs not noticed until now which prevents this from working correctly with startx (startx ends up supplying both :display and -displayfd, which doesn't work correctly, and the xauthority generated may reference the wrong display number, leaving clients unable to connect) [1] http://x.cygwin.com/docs/ug/using-terminal-server.html -- Jon TURNEY Volunteer Cygwin/X X Server maintainer -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
X11 capturing DISPLAY value
I wanted to capture the X11 DISPLAY value that shows on the console when 'startx ' in invoked and successful. I've tried: startx 21 | grep DISPLAY\= /tmp/xwin.txt startx 21 | grep DISPLAY /tmp/xwin.txt but neither worked. I could check files in /tmp/.X11-unix/* for date, owner, etc, and hope that the newest one is the right one and extract the number from the name, however if another user started an X window in the meantime I'd get the wrong DISPLAY v alue. Is there a preferred standard way to get this value? -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: X11 capturing DISPLAY value
On 3/10/2013 6:17 PM, wynfi...@gmail.com wrote: I wanted to capture the X11 DISPLAY value that shows on the console when 'startx ' in invoked and successful. I've tried: startx 21 | grep DISPLAY\= /tmp/xwin.txt startx 21 | grep DISPLAY /tmp/xwin.txt but neither worked. I could check files in /tmp/.X11-unix/* for date, owner, etc, and hope that the newest one is the right one and extract the number from the name, however if another user started an X window in the meantime I'd get the wrong DISPLAY v alue. Is there a preferred standard way to get this value? Usually :0.0 or something like $(hostname):0.0 will do, unless you have multiple screens or are connecting to a remote host. In the latter case you would not be running startx, so the :0.0 or $(hostname):0.0, or something along those lines, should be fine. I believe it's the usual thing most people do ... As for the above, if you try immediately to examine /tmp/xwin.txt, the answer may not be there yet, since it takes a little while for startx and grep to begin to do their thing and you put at the end of the pipeline, which means to proceed immediately. So there's an inherent shell script programming timing / concurrency race that you would need to solve for this approach to work. Regards -- Eliot Moss -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: X11 capturing DISPLAY value
Thanks, but I don't like hard coding something important like that. It might work most of the time, in my case it wouldn't work, my X-window comes up as :1 and it appears sometimes as :0, but mainly one, but if more people were on the machine it cou ld be other values as well. You're right about the background takes time, I'll attempt coordination the timing better and try it. Thanks Eliot Moss m...@cs.umass.edu wrote: On 3/10/2013 6:17 PM, wynfi...@gmail.com wrote: I wanted to capture the X11 DISPLAY value that shows on the console when 'startx ' in invoked and successful. I've tried: startx 21 | grep DISPLAY\= /tmp/xwin.txt startx 21 | grep DISPLAY /tmp/xwin.txt but neither worked. I could check files in /tmp/.X11-unix/* for date, owner, etc, and hope that the newest one is the right one and extract the number from the name, however if another user started an X window in the meantime I'd get the wrong DISPL AY v alue. Is there a preferred standard way to get this value? Usually :0.0 or something like $(hostname):0.0 will do, unless you have multiple screens or are connecting to a remote host. In the latter case you would not be running startx, so the :0.0 or $(hostname):0.0, or something along those lines, should be fine. I believe it's the usual thing most people do ... As for the above, if you try immediately to examine /tmp/xwin.txt, the answer may not be there yet, since it takes a little while for startx and grep to begin to do their thing and you put at the end of the pipeline, which means to proceed immediately. So there's an inherent shell script programming timing / concurrency race that you would need to solve for this approach to work. Regards -- Eliot Moss -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
