Re: Checking whether Gnome screensaver currently active

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On 01/18/2011 12:28 PM, Rick Sewill wrote:
> On Tuesday, January 18, 2011 09:00:22 am Robert Nichols wrote:
>> On 01/18/2011 01:34 AM, Rick Sewill wrote:
>>> On Monday, January 17, 2011 10:57:00 pm Robert Nichols wrote:
>>>> On 01/17/2011 09:57 PM, Rick Sewill wrote:
>>>>> Question please:
>>>>>
>>>>> Can you use
>>>>> gnome-screensaver-command -q
>>>>>
>>>>> man gnome-screensaver-command
>>>>>
>>>>> I'm currently trying out KDE so I don't know
>>>>> what is returned by the above command for the
>>>>> various gnome-screensaver states.
>>>>
>>>> As I said in my original message, when run from a cron job that fails:
>>>>         ** Message: Failed to connect to the D-BUS daemon:
>>>>         /bin/dbus-launch terminated abnormally with the following error:
>>>>         Autolaunch error: X11 initialization failed.
>>>>
>>>> And yes, I did try it with "DISPLAY=:0.0" in the environment.
>>>
>>> You have a good puzzle!
>>>
>>> I read all the responses for the problem,
>>> http://www.mail-archive.com/debian-kde@xxxxxxxxxxxxxxxx/msg30421.html
>>>
>>> I tried to condense their answer to the following...please give it a try:
>>>
>>> I created a file, ${HOME}/bin/testscreensaver
>>> ===== Please begin contents of file testscreensaver with following line
>>> #!/bin/bash
>>>
>>> # We must set the DISPLAY variable so dbus is happy.
>>>
>>> export DISPLAY=:0.0
>>>
>>> # We must find the DBUS_SESSION_BUS_ADDRESS so dbus is happy.
>>>
>>> for pid in $(pgrep -u $USER)
>>> do
>>>
>>>       declare DBUS_SESSION_BUS_ADDRESS=$(cat /proc/${pid}/environ | \
>>>
>>>               tr '\0' '\n' | grep "DBUS_SESSION_BUS_ADDRESS=")
>>>
>>> # I looked for the first DBUS_SESSION_BUS_ADDRESS found.
>>>
>>>       [ -z "${DBUS_SESSION_BUS_ADDRESS}" ] || break
>>>
>>> done
>>>
>>>
>>> # Strip off the DBUS_SESSION_BUS_ADDRESS= string at the beginning.
>>> DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:25}"
>>>
>>> # I echo it for debugging purposes...you probably don't want to echo it.
>>> echo "Set bus address to<${DBUS_SESSION_BUS_ADDRESS}>"
>>>
>>> # If I have a string, I call the gnome-screensaver-command
>>> [ -z "${DBUS_SESSION_BUS_ADDRESS}" ] || gnome-screensaver-command -q
>>>
>>> ===== Please end file testscreensaver with previous line
>>
>> Hmmm, in that script you're not doing anything with
>> DBUS_SESSION_BUS_ADDRESS beyond testing for non-null (it's not exported),
>> so "Set bus address to" is a misnomer.  "Found bus address" might be more
>> to the point.  It does test whether this user currently has a session,
>> which is useful.
>>
>
> Please see "man dbus-daemon".
>
> I believe the variable, DBUS_SESSION_BUS_ADDRESS, must be set for desktop
> applications to find the per-session daemon to have interprocess communication
> amongst themselves.  From "man dbus-daemon", I am referring to the per-session
> daemon, not the systemwide daemon.

Look again at the script you posted and explain where it does anything but
set and test for non-null an internal shell variable that has no special
meaning to the shell itself.  Had you in some manner exported that variable
so that gnome-screensaver-command could see it, then I would have more
reason to believe you.

-- 
Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.

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