Re: [Dorset] Launching a graphical App from within a script
Hi Dan, > The first X session being :0.0, (you can specify a hostname before the > colon) the second will be :1.0, will it not? No, not necessarily. When you start the X server you can tell it what display number this particular X server has by specifying it as a parameter. X :1 The "switch user" mechanism in Gnome seems to leap straight from :0 to :20, perhaps to allow the :0 user a few displays to use, e.g. for Xnest(1). The number determines the network port the X server listens on. 6000 is the base, $ grep -w 6000 /etc/services x11 6000/tcpx11-0 # X Window System x11 6000/udpx11-0 $ i.e. :0 listens on 6000 and :20 listens on 6020. > I'm not sure about the .0, as you can also refer to it with just :0, > :1, etc., and they get mapped on the local machine like :0 -> > ctrl+alt+f7, :1 -> ctrl+alt+f8, etc., unless they're virtual (e.g. > VNC) It's "[network_host]:display[.screen]". The screen defaults to 0. It's the logical X screen and may not relate to the physical screens you have. Here's I've two X server's running, :0 and :20. The Unix domain sockets under /tmp/.X11-unix are how clients connect to them. lsof(8) shows :0 has quite a few more clients than :20 but it's always showing Xorg as the command rather than a client e.g. xclock(1). $ sudo lsof /tmp/.X11-unix/* COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME Xorg 6516 root1u unix 0xee0cd700 16820 /tmp/.X11-unix/X0 Xorg 6516 root9u unix 0xee0cdc40 17071 /tmp/.X11-unix/X0 Xorg 6516 root 10u unix 0xef308380 17282 /tmp/.X11-unix/X0 Xorg 6516 root 11u unix 0xeea5dc40 17338 /tmp/.X11-unix/X0 Xorg 6516 root 12u unix 0xef37d1c0 17456 /tmp/.X11-unix/X0 Xorg 6516 root 13u unix 0xeeedc540 19181 /tmp/.X11-unix/X0 Xorg 6516 root 14u unix 0xeefffa80 19345 /tmp/.X11-unix/X0 Xorg 6516 root 15u unix 0xee8f3a80 19478 /tmp/.X11-unix/X0 Xorg 6516 root 16u unix 0xeea60a80 19495 /tmp/.X11-unix/X0 Xorg 6516 root 17u unix 0xeeb7c1c0 20318 /tmp/.X11-unix/X0 Xorg 6516 root 18u unix 0xef311e00 19593 /tmp/.X11-unix/X0 Xorg 6516 root 19u unix 0xee579380 20089 /tmp/.X11-unix/X0 Xorg 6516 root 20u unix 0xee5791c0 19941 /tmp/.X11-unix/X0 Xorg 6516 root 21u unix 0xee582700 594142 /tmp/.X11-unix/X0 Xorg 6516 root 22u unix 0xee640380 20041 /tmp/.X11-unix/X0 Xorg 6516 root 23u unix 0xee640700 20046 /tmp/.X11-unix/X0 Xorg 6516 root 24u unix 0xeeb08e00 20179 /tmp/.X11-unix/X0 Xorg 6516 root 25u unix 0xeeb7ce00 20320 /tmp/.X11-unix/X0 Xorg 6516 root 26u unix 0xef8ee8c0 20541 /tmp/.X11-unix/X0 Xorg 6516 root 27u unix 0xef137c40 594383 /tmp/.X11-unix/X0 Xorg 6516 root 28u unix 0xef28dc40 575863 /tmp/.X11-unix/X0 Xorg 6516 root 29u unix 0xd10f58c0 614438 /tmp/.X11-unix/X0 Xorg 6516 root 30u unix 0xefbbb380 584330 /tmp/.X11-unix/X0 Xorg 6516 root 31u unix 0xefb82540 608470 /tmp/.X11-unix/X0 Xorg 6516 root 32u unix 0xd10f5700 614453 /tmp/.X11-unix/X0 Xorg14916 root1u unix 0xee60ee00 608993 /tmp/.X11-unix/X20 Xorg14916 root9u unix 0xee60e380 609146 /tmp/.X11-unix/X20 Xorg14916 root 10u unix 0xef1371c0 609777 /tmp/.X11-unix/X20 Xorg14916 root 11u unix 0xef8ee540 609836 /tmp/.X11-unix/X20 Xorg14916 root 12u unix 0xee736380 609951 /tmp/.X11-unix/X20 Xorg14916 root 13u unix 0xc0d0a380 611567 /tmp/.X11-unix/X20 Xorg14916 root 14u unix 0xc0d0a540 611677 /tmp/.X11-unix/X20 Xorg14916 root 15u unix 0xeecdb700 611822 /tmp/.X11-unix/X20 Xorg14916 root 16u unix 0xee583380 611888 /tmp/.X11-unix/X20 Xorg14916 root 17u unix 0xef8c2c40 611911 /tmp/.X11-unix/X20 Xorg14916 root 19u unix 0xd12f9e00 612433 /tmp/.X11-unix/X20 Xorg14916 root 20u unix 0xc4ff48c0 612259 /tmp/.X11-unix/X20 Xorg14916 root 21u unix 0xd1313380 612672 /tmp/.X11-unix/X20 Xorg14916 root 22u unix 0xee60ac40 612382 /tmp/.X11-unix/X20 Xorg14916 root 23u unix 0xd1313e00 612686 /tmp/.X11-unix/X20 Xorg14916 root 24u unix 0xd1239c40 612724 /tmp/.X11-unix/X20 $ Cheers, Ralph. -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On Friday 07 Jan 2011, Ralph Corderoy wrote: > I think you're approaching it the wrong way around. When the X server > starts it runs a command and when that command finishes the X server > stops. The command normally starts a window or session manager which in > turn start up panels, initial applications, etc. It's here that you > should be running a browser. > > Because of the flexibility it's hard to give explicit instructions as to > how to set this up. Is there a ~/.xsession or ~/.xsessionrc file? If > it's a shell script you should be able to spot where to run the browser > in there. There is a ~/.xsession. > Alternatively, http://www.tinycorelinux.com/faq.html#appstart That looks as if it might be the way. I read those FAQs some weeks ago, but didn't know I wanted to do this then ;-( -- Terry Coles 64 bit computing with Kubuntu Linux -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
Hi Terry, > This is going to run on our TC live disc with the command to start it > being in /opt/bootlocal.sh. There will only be one user when it is > run and I know that X & the desktop are running when it gets to this > part of the script. I suppose it could conceivably happen the other > way round, but I haven't seen it yet. > > However, just in case; is there a reliable way of testing to see if X > is up before launching Chromium? If so, I could wait in a loop until > it is. I think you're approaching it the wrong way around. When the X server starts it runs a command and when that command finishes the X server stops. The command normally starts a window or session manager which in turn start up panels, initial applications, etc. It's here that you should be running a browser. Because of the flexibility it's hard to give explicit instructions as to how to set this up. Is there a ~/.xsession or ~/.xsessionrc file? If it's a shell script you should be able to spot where to run the browser in there. Alternatively, http://www.tinycorelinux.com/faq.html#appstart Cheers, Ralph. -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
It's been a long time since I did it but I seem to recall you can set up a .xinitrc file in the user's home directory to control things you want to start when the X session starts. That way you know that X will be running, and you don't need to know which $DISPLAY you are running. -- best regards, Victor Churchill, Bournemouth -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
The first X session being :0.0, (you can specify a hostname before the colon) the second will be :1.0, will it not? I'm not sure about the .0, as you can also refer to it with just :0, :1, etc., and they get mapped on the local machine like :0 -> ctrl+alt+f7, :1 -> ctrl+alt+f8, etc., unless they're virtual (e.g. VNC) Cheers -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On Friday 07 Jan 2011, Ralph Corderoy wrote: > John Carlyle-Clarke wrote: > > Of course, if you have more than one X session running, or if you are > > running X remotely, then things may go a bit wonky since DISPLAY will > > need to be something else! > > One way for this to happen is to "switch user" so that other user logs > in on their own desktop. `echo $DISPLAY' will show something else on > that second X server, probably ":20.0". So if one day that other user > beats you to the machine, he gets :0.0 and you get lumbered with :20.0. > > Where is this script to run at boot time? It may also fail if the > user's desktop isn't up and running by then. This is going to run on our TC live disc with the command to start it being in /opt/bootlocal.sh. There will only be one user when it is run and I know that X & the desktop are running when it gets to this part of the script. I suppose it could conceivably happen the other way round, but I haven't seen it yet. However, just in case; is there a reliable way of testing to see if X is up before launching Chromium? If so, I could wait in a loop until it is. -- Terry Coles 64 bit computing with Kubuntu Linux -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
Hi Terry, John Carlyle-Clarke wrote: > Of course, if you have more than one X session running, or if you are > running X remotely, then things may go a bit wonky since DISPLAY will > need to be something else! One way for this to happen is to "switch user" so that other user logs in on their own desktop. `echo $DISPLAY' will show something else on that second X server, probably ":20.0". So if one day that other user beats you to the machine, he gets :0.0 and you get lumbered with :20.0. Where is this script to run at boot time? It may also fail if the user's desktop isn't up and running by then. Cheers, Ralph. -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On Friday 07 Jan 2011, John Carlyle-Clarke wrote:
> On 07/01/11 15:19, Terry Coles wrote:
> > I assume that I was right about the reason it wouldn't work in a script,
> > eg I'm not attached to the display in the X environment at the time?
>
> That's pretty much it. Processes generally inherit an environment from
> the process that spawns them. xinit or startx or {x,k,g}dm set
> "DISPLAY" and other things when starting X and launching the clients
> (usually a window manager or similar).
>
> This means when you start a shell in your graphical session, it inherits
> DISPLAY. Start a terminal in X and do "echo $DISPLAY" to check it.
>
> If your shell script was started outside of X in some way (by cron, atd,
> or boot process for example) then DISPLAY will not be set.
>
> Of course, if you have more than one X session running, or if you are
> running X remotely, then things may go a bit wonky since DISPLAY will
> need to be something else!
Thanks.
--
Terry Coles
64 bit computing with Kubuntu Linux
--
Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00
Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/
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Re: [Dorset] Launching a graphical App from within a script
On 07/01/11 15:19, Terry Coles wrote:
On Friday 07 Jan 2011, John Carlyle-Clarke wrote:
DISPLAY=:0.0 chromium-browser
Thanks. That works fine.
I assume that I was right about the reason it wouldn't work in a script, eg
I'm not attached to the display in the X environment at the time?
That's pretty much it. Processes generally inherit an environment from
the process that spawns them. xinit or startx or {x,k,g}dm set
"DISPLAY" and other things when starting X and launching the clients
(usually a window manager or similar).
This means when you start a shell in your graphical session, it inherits
DISPLAY. Start a terminal in X and do "echo $DISPLAY" to check it.
If your shell script was started outside of X in some way (by cron, atd,
or boot process for example) then DISPLAY will not be set.
Of course, if you have more than one X session running, or if you are
running X remotely, then things may go a bit wonky since DISPLAY will
need to be something else!
--
Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00
Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/
How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On Friday 07 Jan 2011, John Carlyle-Clarke wrote: > DISPLAY=:0.0 chromium-browser Thanks. That works fine. I assume that I was right about the reason it wouldn't work in a script, eg I'm not attached to the display in the X environment at the time? -- Terry Coles 64 bit computing with Kubuntu Linux -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On 07/01/11 15:04, John Carlyle-Clarke wrote: On 07/01/11 15:02, Terry Coles wrote: Hi, Is there a reason why the Chromium Browser launches fine when I type chromium-browser in a shell, but doesn't when I put the same command into a script to run at boot time? Try:- TERMINAL=:0.0 chromium-browser What am I talking about? DISPLAY=:0.0 chromium-browser -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
Re: [Dorset] Launching a graphical App from within a script
On 07/01/11 15:02, Terry Coles wrote: Hi, Is there a reason why the Chromium Browser launches fine when I type chromium-browser in a shell, but doesn't when I put the same command into a script to run at boot time? According to the error message, it can't find the display mode, so I'm guessing that it works because I'm not in a true terminal when it works (it's Aterm, which is a graphical app) and I am when the script is running. Or is it something else? What do I need to do to get it to work? I'm assuming I will need to do some magic with xhost, etc, but some guidancce would be useful. Try:- TERMINAL=:0.0 chromium-browser -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
[Dorset] Launching a graphical App from within a script
Hi, Is there a reason why the Chromium Browser launches fine when I type chromium-browser in a shell, but doesn't when I put the same command into a script to run at boot time? According to the error message, it can't find the display mode, so I'm guessing that it works because I'm not in a true terminal when it works (it's Aterm, which is a graphical app) and I am when the script is running. Or is it something else? What do I need to do to get it to work? I'm assuming I will need to do some magic with xhost, etc, but some guidancce would be useful. -- Terry Coles 64 bit computing with Kubuntu Linux -- Next meeting: Crown Hotel, Blandford Forum, Tuesday 2011-01-11 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ How to Report Bugs Effectively: http://goo.gl/4Xue
