Re: AW: [lwip-users] Still a Bug with memory wasting after PPP reconnect?

[Alain M.]

Could you please describe the bug a little more and how you fixed or 
worked around that?

We are starting to use lwip for GPRS modem too, and any information will 
be wellcomed :)

thanks,
Alain

Letschi escreveu:
> I found it! It isn't a lwip-Bug! With every reconnect I called pppInit and
> this function calls mem_malloc!
>
> -----Ursprüngliche Nachricht-----
> Von: address@hidden
> [mailto:address@hidden Im Auftrag
> von address@hidden
> Gesendet: Samstag, 7. März 2009 19:21
> An: Mailing list for lwIP users
> Betreff: Re: [lwip-users] Still a Bug with memory wasting after PPP
> reconnect?
>
> I know this is not the answer you'd expect, but I have to warn you that 
> there is currently no active developer using the PPP part of lwIP, so 
> you might have to rely on answers of other users on this list. As 
> always, new developers caring about PPP are welcome to take part and 
> improve it!
>
> Simon
>
>
> Letschi wrote:
> > Hello!
> >
> > I am using PPP over a serial interface to communicate with a 
> > GSM-Modem. This works fine, but I have the following problem: After 
> > closing the PPP connection and reestablishing the connection, my 
> > application crashes because pbuf_alloc returns NULL. The number of 
> > reconnects the application “survives” depends on the define MEM_SIZE 
> > (size of reserved heap memory). My application only uses one 
> > pbuf_malloc-call:
> >
> > Int SendUdpMsg (udp_pcb *pUdpConn, void *pBuff, int nLength )
> >
> > {
> >
> > struct pbuf* packet;
> >
> > char * data;
> >
> > packet=(struct pbuf *)pbuf_alloc(PBUF_TRANSPORT, nLength, PBUF_RAM);
> >
> > Assert( packet != NULL );
> >
> > data=(char*)packet->payload;
> >
> > memcpy(data, pBuff, nLength );
> >
> > udp_send(pUdpConn, packet);
> >
> > pbuf_free( packet );
> >
> > return nLength;
> >
> > }
> >
> > As you can see I free the allocated memory directly after sending, so 
> > I don’t really know who is wasting my mem? Anyone an idea?`
> >
> > Best regards,
> >
> > Letschi
> >
> > ------------------------------------------------------------------------