Add Process and Signals support

Signed-off-by: Jan Lindemann <jan@janware.com>

tools/python/jwutils/Signals.py

@@ -0,0 +1,34 @@
+from abc import ABC, abstractmethod
+
+_handled_signals = {}
+
+def _signal_handler(signal, frame):
+    if not signal in _handled_signals.keys():
+        return
+    for h in _handled_signals[signal]:
+        h.func(signal, *h.args)
+
+class Signals:
+
+    class Handler:
+        def __init__(self, func, args):
+            self.func = func
+            self.args = args
+
+    def __init(self):
+        pass
+
+    @classmethod
+    @abstractmethod
+    def _add_handler(self, signal, handler):
+        raise Exception("_add_handler() is not reimplemented")
+
+    @classmethod
+    def add_handler(cls, signals, handler, *args):
+        for signal in signals:
+            h = Signals.Handler(handler, args)
+            if not signal in _handled_signals.keys():
+                _handled_signals[signal] = [h]
+                cls._add_signal_handler(signal, _signal_handler)
+            else:
+                _handled_signals[signal].add(h)