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marco.difresco
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Joined: 29 Jul 2011
Posts: 165
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 Posted: Sat Jan 18, 2014 10:30 am Post subject: [KDE] Bind scripts to the screensaver start/stop |
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Hi all,
I have tried to search around, but without success.
Is it possible to configure KDE to launch specific scripts when the screensaver start and stop (one script on start and one on stop)?
I am doing some bitcoin mining and I am trying to balance the uptime of the mining program and not having the PC locked up by it when I am at my desk. So far I relied on crontab, but since I have to input the exact times for it to work, I have to input the average times I leave for lunch/dinner and when I go to bed in the evening and the average time I am back to stop the program, but this solution means that if I leave later and/or I return earlier than these average times I have to deal with the lagginess of the desktop until crontab reach the time to call the stopping script and, on the other end, if I leave earlier and/or return later I have some wasted computer time where the mining program isn't running.
Thank you in advance.
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franzf
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Joined: 29 Mar 2005
Posts: 4565
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| Posted: Sat Jan 18, 2014 11:28 am Post subject: |
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| Why not just use nice/ionice to set priority of your bitcoin script so that it does not disturb you when you are working? |
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aCOSwt
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Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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| Posted: Sat Jan 18, 2014 1:25 pm Post subject: |
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Be aware that I do not precisely know waht I am talking about since I don't make use of screensavers.
1/ It seems that kde screensaver can be easily replaced by the XScreenSaver.
In which case, browse : http://www.jwz.org/xscreensaver/man3.html
and scroll down to the description of the-watch option.
2/ I understand that the org.kde.screensaver service is provided by KRunner wich registers on dBus.
So, it must be possible to get access via dbus in some way.
Then... don't ask me where to find the appropriate documentation for the API. I... dont' know. 
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marco.difresco
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Joined: 29 Jul 2011
Posts: 165
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| Posted: Sat Jan 18, 2014 4:08 pm Post subject: |
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Thank you both for your answers.
Following aCOSwt's answer as lead I ended up to the following two pages:
http://superuser.com/questions/205334/how-do-you-get-ubuntu-to-automatically-run-a-program-every-time-the-screen-is-un
http://www.linuxquestions.org/questions/fedora-35/start-and-stop-script-with-screensaver-728498/
that lead me to create the following script:
| Code: | #!/bin/bash
dbus-monitor --session "type='signal',interface='org.freedesktop.ScreenSaver',member='ActiveChanged'" | while read line ; do
if [ x"$(echo "$line" | grep 'boolean true')" != x ] ; then
~/miner-start
fi
if [ x"$(echo "$line" | grep 'boolean false')" != x ] ; then
~/miner-stop
fi
done |
~/miner-start and ~/miner-stop are two script that I was using with crontab and contain respectively:
| Code: | killall cgminer
sleep 2
cgminer -c ~/.cgminer/cgminer.conf &
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and
(~/miner-start starts with a "killall cgminer" as a backup in case I accidentally start it twice).
The above script has one problem that prevent it from fully working: if I launch it from a console it will keep the console occupied (until I press CTRL+C), but it works when the screensaver start and stop; if I launch it with an & at the end (to get back the console and close it) or if I launch it at the user login (by link it to ~/.kde4/Autostart), it shows up on the task manager but it wouldn't work (nothing start/stop at the screensaver start/stop).
Any idea?
Thank you again for your help.
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Marco Di Fresco
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