Re: [lwip-users] lwip with libcurl and memory corruption !

[Prashant R]

Hi ,

So I am getting the data as expected , however I have replaced socket calls in libcurl with lwip_ calls . 

Yes Martin in right in the sense that libcurl is doing the the send -read -  select loop . 

Thanks ,

On Mon, Feb 7, 2011 at 1:47 AM, Martin Velek <address@hidden> wrote:

I would suppose he is using the lwip socket API via a libcurl calls.
Maybe the libcurl expects the socket API is at 100% compatible with
BSD sockets. If the libcurl handles non-blocking sockets with a
standard way ( send - read how many sent - select loop), it may fail
due to lwip does not support this
concept(http://savannah.nongnu.org/bugs/?31084). However the error is
returned and libcurl should deal with it. It depends on the exact
explanation of "I see some corruption when I repeat this operation".

>Is there a good starting  point to debug this ?

Of course, the lwip have a nice debug capability at defined level.
Read wiki http://lwip.wikia.com/wiki/Debugging_lwIP
You can use the lwip port for linux too and you will get advantage of
debugging on a PC platform with standard tools.

Martin

On 7 February 2011 10:31, Kieran Mansley <address@hidden> wrote:
> On Sun, 2011-02-06 at 21:56 -0800, Prashant R wrote:
>> Is there a good starting  point to debug this ?
>
> It's almost certainly a threading problem caused by the way you're
> interfacing to lwIP.
>
> Which lwIP API are you using?  Does your application have multiple
> threads accessing lwIP?  Can you give a code example of:
> 1) how your application sends and receives packets
> 2) how your driver passes received packets to lwIP for processing?
>
> Thanks
>
> Kieran
>
>
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