[lwip-users] Re: [lwip] Correct procedure in callback functions set with tcp_recv() & udp_recv()

[paul wisbey]

Ok, thanks for the clarification Kieran...   there's one other thing about 
pbufs though...   when calling udp_send() I need a properly constructed 
pbuf.  I imagine this involves pbuf_alloc(), but I was expecting a PBUF_UDP 
option for the protocol layer param.  Anyway, my  attempt is:
  packet_buf = pbuf_alloc(PBUF_TRANSPORT, pktSize, PBUF_RAM);
  memcpy(packet_buf->payload, send_buf, pktSize);
  udp_send(pcb, packet_buf);
Is there anything obviously wrong/missing here?

Paul

>From: Kieran Mansley <address@hidden>
>Reply-To: address@hidden
>To: address@hidden
>Subject: Re: [lwip] Correct procedure in callback functions set with 
>tcp_recv() & udp_recv()
>Date: Tue, 16 Jul 2002 15:56:32 +0100 (BST)
>
>On Tue, 16 Jul 2002, paul wisbey wrote:
>
> > Hi,
> >    the rawapi.txt mentions that tcp_recved() should be called after
> > receiving tcp segments, ie. when the function set with tcp_recv() is 
>called.
> >   Should I also be calling pbuf_free()?  (I've had problems if I don't 
>do
> > this).  Is this different with the corresponding UDP callback function?  
>(I
> > haven't tried that yet).  Thanks,
>
>Yes, you should also call pbuf_free, once you've finished with the data.
>This might not be straight away, but if you don't you'll run out of pbufs.
>I'm pretty sure this is the same for UDP.
>
>Kieran
>
>
>
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