mayday (m'aidez) our monitors are sick

[Ronald Wiemer]

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> Subject: mayday (m'aidez) our monitors are sick
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> We have an epidemic of monitors failing.
> 
> basically they lock up and become totally unresponsive
> even if you completely logout and start up GRASS again
> you just get the message:
> 
> GRASS 4.1 > d.mon start=x0
> Graphics driver [x0] is already running
> Warning - no response from graphics monitor <x0>.
> Check to see if the mouse is still active.
> ERROR - no response from graphics monitor <x0>.
> Problem selecting x0. Will try once more
> Warning - no response from graphics monitor <x0>.
> Check to see if the mouse is still active.
> ERROR - no response from graphics monitor <x0>.
> 
> Mapset <watertables> in Location <shropshire> 
> GRASS 4.1 >
> 
> stopping them produces a response:
> 
> GRASS 4.1 > d.mon stop=x0
> Monitor 'x0' terminated
> 
> Mapset <watertables> in Location <shropshire> 
> GRASS 4.1 >
> 
> but they can still not be started (same message as above)
> I've only lost the use of x0 but other people have lost
> x1 and x2 (we'll run out soon!. 
> We have been using GRASS for ages and this has only just
> started, anybody got any bright ideas?
> 
> cheers  Tom  8-)
> 
> Tom Charnock                       O--O
> Dept Civil Engineering            (~~~~)
> Aston University                 (  __  )
> Birmingham B4 7ET UK             /|\  /|\
> charnotw at sun.aston.ac.uk
> 
I presume you are running the message queue version of the 
grass monitor. I you do, you can use the following script

********* begin *********

:
NAAM=$1
if [ "$NAAM" = "" ]
then
    echo "Usage: KillX username"
    exit
fi
eval `ipcs -aq | awk '{if ( $5 == NAAM ) print "PID=" $13 }' 
NAAM=$NAAM`
for P in `ps -e | awk '{if ( $4 == "XDRIVER" && $1 == PID) print $1}' 
PID=$PID`
do
    kill -9 $P
done
for i in `ipcs -aq | awk '{if ($1 == "q" && $5 == NAAM) print $2}' 
NAAM=$NAAM`
do
    ipcrm -q $i
done
******end*******

The problem with these MQ's is that the Xdriver keeps running when 
it's out of sinc. the script kills the Xdriver, and -very important- 
removes the MQ's. You have to run the script (as user root) for each 
user that has a hanging Xdriver. You can check wether your system 
uses MQ's by running the program:

ipcs -aq

See the man page for ipcs.

Succes

Ronald Wiemer