[Mono-bugs] [Bug 79735][Wis] New - Serial stream Read returns 0 on timeout.

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Tue Oct 24 16:44:22 EDT 2006

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Changed by jelle.hissink at c-it.nl.


--- shadow/79735	2006-10-24 16:44:22.000000000 -0400
+++ shadow/79735.tmp.11470	2006-10-24 16:44:22.000000000 -0400
@@ -0,0 +1,50 @@
+Bug#: 79735
+Product: Mono: Class Libraries
+Version: 1.1
+OS Details: 
+Status: NEW   
+Priority: Wishlist
+Component: System
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: Jelle.Hissink at C-it.nl               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+Summary: Serial stream Read returns 0 on timeout.
+Description of Problem:
+Please accept my apologies if this report is incorrect or incomplete... As 
+I don't know where to turn for more information an I didn't have time to 
+investigate any further. I just wanted to put the information I have till 
+now out there so here it goes.
+The System.IO.Ports.SerialStream class Read method returns 0 if it has a 
+read timeout and the timeout occurs. Previously it returned -1 to indicate 
+a timeout. Msdn states:
+   Read returns 0 only when there is no more data in the stream and no 
+more is expected (such as a closed socket or end of file).
+I remember Microsoft throwing a TimeOutException.
+Actual Results:
+Read returns 0 on a timeout.
+Expected Results:
+Shouldn't it throw an exception? (Does 0 still indicate end of stream?)
+I remember Microsoft throwing a TimeOutException
+How often does this happen? 
+See also bug: 79722 - SerialPort: read_serial prototypes do not match
+Another observation: read_serial() in serial.c does not seem to wait at 
+all, it just returns directly?
+Jelle Hissink

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