app uses signals helper

app/app.sh

@@ -1,8 +1,35 @@
 #!/bin/bash
 
+# Signal helper
+source /app/signals.sh
+
 echo Using DISPLAY $DISPLAY
 export XDG_RUNTIME_DIR=/tmp/runtime-doge
-#export QT_QPA_PLATFORM=offscreen
-#export QT_X11_NO_MITSHM=1
-#export QT_DEBUG_PLUGINS=1
-exec dogecoin-qt
+
+set -x
+
+PID=$$
+TERM_handler() {
+    SIGNAME="$1"
+    echo "Killing ${PID}"
+    echo "Signal ${SIGNAME}"
+    if [ ${PID} -ne 0 ]; then
+        ps -ef --forest
+        CHILDS=$(pgrep -P "${PID}")
+        kill -SIGTERM -"${PID}"
+        for i in $CHILDS; do
+          wait $i
+        done
+    fi
+    ps -ef --forest
+    ret=$(signal_return_val ${SIGNAME})
+    exit $ret
+}
+
+signals_trap_with_arg TERM_handler SIGTERM SIGINT
+
+# Application
+dogecoin-qt&
+
+# wait forever
+signals_wait_forever

app/signals.sh

@@ -0,0 +1,25 @@
+signals_trap_with_arg() {
+    func="$1" ; shift
+    for sig ; do
+        echo "$func $sig"
+        trap "$func $sig" "$sig"
+    done
+}
+
+signals_wait_forever() {
+    while true
+    do
+        tail -f /dev/null & wait ${!}
+    done
+}
+
+signal_name_to_number() {
+    SIGNAME="$1"
+    trap -l | sed -nr "s/.*\b([0-9]+)\) $SIGNAME.*/\1/p"
+}
+
+signal_return_val() {
+    SIGNAME="$1"
+    SIGNUM=$(signal_name_to_number ${SIGNAME})
+    echo "128 + $SIGNUM" | bc
+}