Merge branch 'dev' into bmk/snmp/support_ipv6_transport_address

1 files changed, 18 insertions, 1 deletions

diff --git a/system/doc/design_principles/events.xml b/system/doc/design_principles/events.xml
index 5579f1e459..23a9b8c7bc 100644
--- a/system/doc/design_principles/events.xml
+++ b/system/doc/design_principles/events.xml
@@ -4,7 +4,7 @@
 <chapter>
   <header>
     <copyright>
-      <year>1997</year><year>2009</year>
+      <year>1997</year><year>2011</year>
       <holder>Ericsson AB. All Rights Reserved.</holder>
     </copyright>
     <legalnotice>
@@ -217,5 +217,22 @@ terminate(_Args, Fd) ->
 ok</pre>
     </section>
   </section>
+  <section>
+    <title>Handling Other Messages</title>
+    <p>If the gen_event should be able to receive other messages than
+      events, the callback function <c>handle_info(Info, StateName, StateData)</c>
+      must be implemented to handle them. Examples of
+      other messages are exit messages, if the gen_event is linked to
+      other processes (than the supervisor) and trapping exit signals.</p>
+    <code type="none">
+handle_info({'EXIT', Pid, Reason}, State) ->
+    ..code to handle exits here..
+    {ok, NewState}.</code>
+    <p>The code_change method also has to be implemented.</p>
+    <code type="none">
+code_change(OldVsn, State, Extra) ->
+    ..code to convert state (and more) during code change
+    {ok, NewState}</code>
+  </section>
 </chapter>