HatariWii/tools/hatari-local-midi-ring.sh

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2018-05-25 20:45:09 +02:00
#!/bin/sh
# argument checks
if [ $# -lt 1 ] || [ \! -z "$(echo $1|tr -d 0-9)" ] || [ $1 -lt 2 ] || [ $1 -gt 16 ]; then
echo "Usage: ${0##*/} <Hatari instances, 2-16> [extra Hatari args]"
echo
echo "Example of running 4 Hatari instances in a MIDI ring, each using midi/ as HD:"
echo " ${0##*/} 4 -d midi/"
exit 1
fi
count=$1
shift
args=$*
# open fifos
for i in $(seq $count); do
mkfifo midi$i
if [ $? -ne 0 ]; then
echo "ERROR: creating FIFO 'midi$i' for MIDI communication failed!"
exit 1
fi
done
# show full path
hatari=$(which hatari)
# run MIDI ring Hatari instances
catpids=""
for i in $(seq $(($count-1))); do
next=$(($i+1))
echo $hatari --midi-in midi$i --midi-out midi$next $args &
hatari --midi-in midi$i --midi-out midi$next $args &
# Without this Hataris would deadlock as fifos
# block the process until both ends are opened.
# Hatari opens midi output first (for writing),
# so this needs to read it.
cat midi$next >/dev/null &
catpids="$catpids $!"
done
# and join the beginning and end of the MIDI ring
echo $hatari --midi-in midi$count --midi-out midi1 $args &
hatari --midi-in midi$count --midi-out midi1 $args &
cat midi1 >/dev/null &
catpids="$catpids $!"
# after connections are open, fifo files can be removed
sleep 2
for i in $(seq $count); do
rm midi$i
done
kill -9 $catpids