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Re: [lwip-users] tcp_sndbuf always returns 0

From: Kieran Mansley
Subject: Re: [lwip-users] tcp_sndbuf always returns 0
Date: Fri, 17 Jul 2009 15:13:18 +0100

On Fri, 2009-07-17 at 21:06 +0800, WU Rui-Qing wrote:
>   In packet capture from wireshark ,the checksum shows Good
> checksum :False  Bad checksum :False . Is this relative to  the
> [validation disabled] configuration ? 

Probably.  It shows up as bad in Wireshark when I look at it.

>   I am sure that the block memory in FIFO is locked and not changed when it 
> is read. 

What happens to it when you move on to the next block though - this is
the point at which you see the problem.

>   when I implement the server using the socket , the server can run long time 
> .Why is this?

Because the socket API correctly sets the TCP_WRITE_FLAG_COPY flag for
you when tcp_write() is called.


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