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|
#!/bin/sh
# Toggle the Virtual Framebuffer
# If started, stop. If stopped, start.
debug=1
verify_pid()
{
verify_pid_result=0
PID0=$1
PID1=$2
BIN=$3
if [ "`ps cax | grep $PID0 | grep $BIN`" ]; then
verify_pid_result=$PID0
elif [ "`ps cax | grep $PID1 | grep $BIN`" ]; then
verify_pid_result=$PID1
fi
return
}
guess_pid_from_ps()
{
guess_pid_from_ps_result=0
BIN=$1
if [ "`ps cx | grep $BIN`" ]; then
echo guessing PID from ps cx '|' grep $BIN
echo `ps cx | grep $BIN`
guess_pid_from_ps_result=`ps cx | grep $BIN | awk '{ print $1 }';`
fi
return
}
start()
{
VFB_BINARY=
VFB_PID=0
if [ "`command -v Xvnc`" ]; then
VFB_BINARY=Xvnc
VFB_OPTIONS='-geometry 800x600 -depth 24'
fi
if [ "`command -v Xvfb`" ]; then
VFB_BINARY=Xvfb
VFB_OPTIONS='-screen 0 800x600x24 -noreset'
fi
if [ ! $VFB_BINARY ]; then
echo "$0 Failed, cannot find Xvnc or Xvfb"
echo "$0 Failed, cannot find Xvnc or Xvfb" > ./virtualfb.log
exit 1
fi
VFB_DISPLAY=`echo | awk 'BEGIN{srand();} {printf ":%.0f", rand()*1000+100};'`
if [ $debug ]; then
echo debug VFB_DISPLAY $VFB_DISPLAY
echo debug VFB_BINARY $VFB_BINARY
echo debug VFB_OPTIONS $VFB_OPTIONS
fi
$VFB_BINARY $VFB_DISPLAY $VFB_OPTIONS > ./virtualfb1.log 2> ./virtualfb2.log &
# on some systems $! gives us VFB_BINARY's PID, on others we have to subtract 1
VFB_PID_MINUS0=$!
VFB_PID_MINUS1=$(($VFB_PID_MINUS0 - 1))
if [ $debug ]; then
echo debug '$!' was $VFB_PID_MINUS0
fi
count=3
while [ "$count" -gt 0 ]; do
verify_pid $VFB_PID_MINUS0 $VFB_PID_MINUS1 $VFB_BINARY
if [ $verify_pid_result -gt 0 ]; then
VFB_PID=$verify_pid_result
count=0
else
echo "failed to find PID $VFB_PID_MINUS0 or $VFB_PID_MINUS1. Retrying"
sleep 1
count=`expr $count - 1`
fi
done
if [ $VFB_PID -eq 0 ]; then
guess_pid_from_ps $VFB_BINARY
VFB_PID=$guess_pid_from_ps_result
fi
if [ $VFB_PID -eq 0 ]; then
echo "started $VFB_BINARY but cannot find process ID in process table ($VFB_PID_MINUS0 or $VFB_PID_MINUS1)"
echo "please stop $VFB_BINARY manually"
if [ $debug ]; then
echo `ps cax | grep $VFB_BINARY`
echo "stdout:"
cat ./virtualfb1.log
echo "stderr:"
cat ./virtualfb2.log
fi
VFB_PID=
return
fi
echo $VFB_DISPLAY > ./virtualfb.DISPLAY
echo $VFB_PID > ./virtualfb.PID
echo "Started $VFB_BINARY fb, PID=$VFB_PID , DISPLAY=$VFB_DISPLAY"
sleep 1
}
stop()
{
VFB_PID=`cat ./virtualfb.PID`
VFB_DISPLAY=`cat ./virtualfb.DISPLAY`
echo "Stopping virtual fb, PID was $VFB_PID, DISPLAY was $VFB_DISPLAY"
kill $VFB_PID
LOCKFILE=`echo "/tmp/.X"$VFB_DISPLAY"-lock"`
if [ -e $LOCKFILE ]; then
rm $LOCKFILE
fi
# Very verbose debug output:
# cat virtualfb1.log
# cat virtualfb2.log
echo 'dump ~/.xession-errors:'
cat ~/.xsession-errors
echo 'end ~/.xession-errors'
rm ./virtualfb.PID
rm ./virtualfb.DISPLAY
}
isrunning()
{
isrunning_result=
if [ -e ./virtualfb.PID ]; then
if [ $debug ]; then echo "found PID file"; fi
VFB_PID=`cat ./virtualfb.PID`
if [ ! $VFB_PID ]; then
echo ./virtualfb.PID contained invalid PID number
return
fi
if [ $debug ]; then echo "PID from file:" $VFB_PID; fi
PS_RESULT=`ps cax | awk ' { print $1 } '`
GREP_RESULT=`echo $PS_RESULT | grep $VFB_PID`
if [ $debug ]; then echo "grep ps result: " $GREP_RESULT; fi
if [ "`ps cax | awk ' { print $1 } ' | grep ^$VFB_PID\$`" ]; then
if [ $debug ]; then echo "found pid in process table."; fi
isrunning_result=1
else
if [ $debug ]; then echo "did not find pid in process table."; fi
fi
fi
}
if [ "`echo $* | grep debug`" ]; then
debug=1
fi
isrunning
if [ $isrunning_result ]; then
stop
else
start
fi
|
