X-Git-Url: https://git.efficios.com/?a=blobdiff_plain;f=src%2Fbindings%2Fpython%2Fbt2%2Fbt2%2Fmessage.py;h=5039d923b59208c1b057f78256ec85083f99e96e;hb=f5567ea88d172767b34373bc6e402da8bfd85ef8;hp=95522736c490a980ea922a75db5cf9ded6bcd54d;hpb=dd26af5bf03f9b21a6ff8eaae0c993827a36cfcf;p=babeltrace.git

diff --git a/src/bindings/python/bt2/bt2/message.py b/src/bindings/python/bt2/bt2/message.py
index 95522736..5039d923 100644
--- a/src/bindings/python/bt2/bt2/message.py
+++ b/src/bindings/python/bt2/bt2/message.py
@@ -22,7 +22,7 @@ class _MessageConst(object._SharedObject):
     def _check_has_default_clock_class(clock_class):
         if clock_class is None:
             raise ValueError(
-                'cannot get default clock snapshot: stream class has no default clock class'
+                "cannot get default clock snapshot: stream class has no default clock class"
             )
 
 
@@ -212,7 +212,7 @@ class _DiscardedMessageConst(_MessageConst, _MessageWithDefaultClockSnapshot):
     def _check_has_default_clock_snapshots(self):
         if not self._has_default_clock_snapshots:
             raise ValueError(
-                'cannot get default clock snapshot: such a message has no clock snapshots for this stream class'
+                "cannot get default clock snapshot: such a message has no clock snapshots for this stream class"
             )
 
     @property
@@ -233,6 +233,10 @@ class _DiscardedMessage(_DiscardedMessageConst, _Message):
 
     def _set_count(self, count):
         utils._check_uint64(count)
+
+        if count == 0:
+            raise ValueError("discarded {} count is 0".format(self._item_name))
+
         self._set_count(self._ptr, count)
 
     _count = property(fget=_DiscardedMessageConst.count.fget, fset=_set_count)
@@ -258,6 +262,7 @@ class _DiscardedEventsMessageConst(_DiscardedMessageConst):
 class _DiscardedEventsMessage(_DiscardedEventsMessageConst, _DiscardedMessage):
     _borrow_stream_ptr = staticmethod(native_bt.message_discarded_events_borrow_stream)
     _set_count = staticmethod(native_bt.message_discarded_events_set_count)
+    _item_name = "event"
 
 
 class _DiscardedPacketsMessageConst(_DiscardedMessageConst):
@@ -280,6 +285,7 @@ class _DiscardedPacketsMessageConst(_DiscardedMessageConst):
 class _DiscardedPacketsMessage(_DiscardedPacketsMessageConst, _DiscardedMessage):
     _borrow_stream_ptr = staticmethod(native_bt.message_discarded_packets_borrow_stream)
     _set_count = staticmethod(native_bt.message_discarded_packets_set_count)
+    _item_name = "packet"
 
 
 _MESSAGE_TYPE_TO_CLS = {