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#!/system/bin/sh
####
# Continuously checks for presence of signal file in 1 second intervals
# Reads either a filename prefix or termination signal from file when it exists
# Writes output of atrace and bugreport to files with supplied prefix
####
SYSTRACE_SUFFIX=".trace";
BUGREPORT_SUFFIX="_bugreport.txt.gz";
TERMINATE_SIGNAL="QUIT";
SIGNAL_FILE="/sdcard/Loopback/loopback_signal"
TRACE_CATEGORIES="sched audio $@"
BUFFER_KB="8000"
function exitListener {
# Exit atrace, remove signal file, and exit
echo "LOOPBACK LISTENER: stopping trace before exiting"
rm $SIGNAL_FILE
atrace --async_stop -z > /dev/null
echo "LOOPBACK LISTENER: exiting"
exit 1
}
# Begin an asynchronous systrace writing into a circular buffer of size BUFFER_KB
echo "LOOPBACK LISTENER: starting trace"
atrace --async_start -z -c -b $BUFFER_KB $TRACE_CATEGORIES
echo " "
# Remove signal file erroneously left behind from previous tests
if [ -e "$SIGNAL_FILE" ]; then rm $SIGNAL_FILE; fi
while true
do
#echo "LOOPBACK LISTENER: checking for file $SIGNAL_FILE"
if [ -e "$SIGNAL_FILE" ] && [ -s "$SIGNAL_FILE" ]
then
contents=$(cat $SIGNAL_FILE)
# Ensure that if more than one listener is running only one will consume signal
> $SIGNAL_FILE
if [ "$contents" == $TERMINATE_SIGNAL ]
then
exitListener
else
for filename in $contents
do
case $filename in
*$SYSTRACE_SUFFIX)
echo "LOOPBACK LISTENER: dumping systrace to file $filename"
atrace --async_dump -z -c -b $BUFFER_KB $TRACE_CATEGORIES > $filename
;;
*$BUGREPORT_SUFFIX)
echo "LOOPBACK LISTENER: dumping bugreport to file $filename"
bugreport | gzip > $filename
;;
esac
done
echo "LOOPBACK LISTENER: Finished capture"
rm $SIGNAL_FILE
fi
fi
sleep 1
done
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