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RE : [lwip-devel] [bug #22112] Recv() makes receive window update fordat

From: Frédéric BERNON
Subject: RE : [lwip-devel] [bug #22112] Recv() makes receive window update fordata, that was not received by application
Date: Fri, 25 Jan 2008 15:48:02 +0100

What is the difference with bug #22110 ?

Frédéric BERNON 
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-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Oleg Tyshev
Envoyé : vendredi 25 janvier 2008 15:41
À : Oleg Tyshev; address@hidden
Objet : [lwip-devel] [bug #22112] Recv() makes receive window update fordata, 
that was not received by application


                 Summary: Recv() makes receive window update for data, that was 
not received by application 
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Friday 01/25/2008 at 14:40
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 




Receive mailbox contains 4 packets each 1000 bytes.
Application makes recv() for 1 byte.
It will be receive window update sent, as if
application 1000 received.

The problem is, that receive buffer is separated to two parts: receive mailbox 
and sock->lastdata. Lwip considers that data in sock->lastdata processed 
immediately. But application can take only part of the data from 
sock->lastdata. And windows update should be sent only to the part that 
application realy received.


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