From 8a5852ae2018b0aa4733d0665082ee3a83cc67c5 Mon Sep 17 00:00:00 2001
From: David Erb <david.erb@diamond.ac.uk>
Date: Wed, 10 May 2023 15:39:53 +0000
Subject: [PATCH] adds a couple exceptions, adds debug marker to signal

---
 src/dls_utilpack/exceptions.py |  8 ++++++++
 src/dls_utilpack/signal.py     | 12 ++++++------
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/dls_utilpack/exceptions.py b/src/dls_utilpack/exceptions.py
index d2ef0f4..c086567 100644
--- a/src/dls_utilpack/exceptions.py
+++ b/src/dls_utilpack/exceptions.py
@@ -2,6 +2,14 @@ class NotFound(RuntimeError):
     pass
 
 
+class ProgrammingFault(RuntimeError):
+    pass
+
+
+class EndOfList(RuntimeError):
+    pass
+
+
 # When something has no value set yet.
 class NotSet(RuntimeError):
     pass
diff --git a/src/dls_utilpack/signal.py b/src/dls_utilpack/signal.py
index 8af0a97..90bec5d 100644
--- a/src/dls_utilpack/signal.py
+++ b/src/dls_utilpack/signal.py
@@ -25,14 +25,14 @@ def __init__(self, signum):
     def _signal_handler(self, sig, frame):
         self._count += 1
         logger.debug(
-            "signum %d happened, count is now %d" % (self._signum, self._count)
+            "[DLSSIG] signum %d happened, count is now %d" % (self._signum, self._count)
         )
         if (
             self._auto_deactivate_count is not None
             and self._count >= self._auto_deactivate_count
         ):
             logger.debug(
-                "signum %d auto deactivate count %d reached"
+                "[DLSSIG] signum %d auto deactivate count %d reached"
                 % (self._signum, self._auto_deactivate_count)
             )
             self.deactivate()
@@ -41,12 +41,12 @@ def _signal_handler(self, sig, frame):
     def activate(self, auto_deactivate_count=None):
         self._auto_deactivate_count = auto_deactivate_count
         self._original = signal.signal(self._signum, self._signal_handler)
-        # logger.debug("signum %d original handler %s replaced by %s" % (self._signum, id(self._original), id(self._signal_handler)))
+        # logger.debug("[DLSSIG] signum %d original handler %s replaced by %s" % (self._signum, id(self._original), id(self._signal_handler)))
         if self._auto_deactivate_count is None:
-            logger.debug("signum %d activated" % (self._signum))
+            logger.debug("[DLSSIG] signum %d activated" % (self._signum))
         else:
             logger.debug(
-                "signum %d activated to auto deactivate at count %s"
+                "[DLSSIG] signum %d activated to auto deactivate at count %s"
                 % (self._signum, self._auto_deactivate_count)
             )
 
@@ -56,7 +56,7 @@ def deactivate(self):
             # original_id = id(self._original)
             signal.signal(self._signum, self._original)
             self._original = None
-            # logger.debug("signum %d deactivated, restoring original handler %s" % (self._signum, original_id))
+            # logger.debug("[DLSSIG] signum %d deactivated, restoring original handler %s" % (self._signum, original_id))
 
     # -----------------------------------------------------------------
     def is_active(self):