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1. The problem statement, all variables and given/known data:
This is a problem I am having with my 2 semester senior project. I have a LAMP server running Ubuntu 9.10 with gnome that I need to run a program on from a button on its website. I'm using 'xterm -e vlc'. A member cero pointed out that I needed to include the display name which is ':0.0', I got when I ran 'echo $DISPLAY' in the terminal. I can run 'xterm -e vlc' in a terminal and 'xterm -display :0.0 -e vlc' in a terminal. However, it doesn't work in a bash cgi script.
I also tried adding localhost before ':0.0' to see if that works, but it didn't.
In short words, I need a program to run on the server from a button on the website. Nothing from the cgi-scrip needs to be displayed on the website.
3. The attempts at a solution (include all code and scripts):
Also tried: 4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
The University of Alabama; Tuscloosa, AL; Dr. Kenneth Ricks; ECE 494 Capstone Design -- The University of Alabama
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You can't dump an executable in your webspace and expect the server to run it, most are only configured to run executables they find in special /cgi-bin/ directories. If you put your script under /var/www/localhost/cgi-bin/scriptname and open http://my.web.page/scriptname, it might go.
Well, the xterm holds up the script from timely termination. Put it in a "nohup ... & 2>/dev/null". Remember it will want to extend a log nohup.out in $PWD. It might work better to export the DISPLAY, as I find -d sometimes does not. If vlc is X, why does it need an xterm?
Coronal688: All my scripts are in the /cgi-bin/ directory where apache2 looks.
DGPickett: vlc is just a the program I am testing to see if I can successfully run a program from cgi-script. It isn't what I need to run. I tried "nohup xterm -display :0.0 -e vlc & 2>/dev/null" but nothing different happened.
It is as if 'xterm -display :0.0 -e vlc' is just skipped. The actual script I am executing is here: Crson Security - Redirect
Last edited by JMooney5115; 01-27-2011 at 04:05 PM..
It is as if 'xterm -display :0.0 -e vlc' is just skipped.
Hmm -- maybe it is. Might not be in the PATH apache gives you. Try calling it with an absolute path. You could also 'source /etc/profile' in case there's other mysterious variables libx11 needs.
For that matter: Apache might just plain be being denied permission to connect to the local X server. Usually these days it only allows someone who's logged into X11 to pop up windows on it.
I changed the path to /usr/bin/vlc, didn't work. Also, 'source /etc/profile' does nothing. I tried in the terminal '/usr/bin/vlc /etc/profile' since I'm unsure of the use of 'source /etc/profile' and vlc just ran.
The use when the script is ran is 'www-data'. Could this be an error due to it being ran as that user?
Your local X server probably doesn't let any user but the one who logged into X pop up windows. xhost + as that user might help,but I'm not sure.
In any case, if this X window really isn't really a part of the project, maybe there's a better way to signal you that it succeeded? Could you make the server's PC speaker beep or something? (install the beep utility, setuid it, then just /usr/bin/beep)
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