isc_que_events callback function randomly return invalid Update Buffer
----------------------------------------------------------------------
Key: CORE-5254
URL: http://tracker.firebirdsql.org/browse/CORE-5254
Project: Firebird Core
Issue Type: Bug
Components: API / Client Library
Affects Versions: 2.5.4
Environment: Windows 7 Ultimate, Firebird 2.5.4, Embarcadero RAD XE2
Reporter: Mahmudv Ilgar
Priority: Critical
I use POST EVENT in triggers and stored procedures. For catching events I try
use FIBPlus, but found AV when registering/unregistering Events (50 % times in
application staring/closing). I write my own component (similar to FIBPlus
super alerter and IBEvents) and found that EventBuffer used in
res = Parent->Database->ClientLibrary->isc_que_events(StatusVector, &DBH,
&EventID, EventBufferLen, EventBuffer, (TISC_CALLBACK)EventCallback,
PVoid)this);
in sometimes corrupt, because of in EventCallback function receive invalid
Updated, witch copied to ResulBuffer and after isc_event_counts copied to
EventBuffer
void EventCallback(void *Ptr, short Length, unsigned char *Updated)
{
if (Ptr && Updated)
{
TMxFBEventsBlockListener *T = (TMxFBEventsBlockListener *)Ptr;
T->UpdateResultBuffer(Length, Updated);
T->SignalEvent();
}
}
//---------------------------------------------------------------------------
void __fastcall TMxFBEventsBlockListener::UpdateResultBuffer(short Length,
unsigned char *Updated)
{
if (Length == EventBufferLen && Updated[0] == 1)
memcpy(ResultBuffer, Updated, Length);
else
// ---------------------------------------------------> INVALID
UPDATED
{
memcpy(ResultBuffer, EventBuffer, EventBufferLen);
// bFirstTime = true;
Parent->DoError("MxFBEventsAlerter: Invalid Updated buffer
="+IntToStr(Length), 0);
}
}
This is floating error. You can 100 times unregister and register again same
event list and see this error 20-50 times.
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