Hi,
Thank you for the pointer to rawapi.txt. I think the following answers the
question:
...The callback function will be passed a NULL pbuf to
indicate that the remote host has closed the connection. If
there are no errors and the callback function is to return
ERR_OK, then it must free the pbuf. Otherwise, it must not
free the pbuf so that lwIP core code can store it.
Is a call to pbuf_free() the correct mechanism to do this or should it be via a
tcp_ level function?
Regards,
Gabriel
Gabriel Harrison
Software Engineer
Tel: +44(0) 1740 626099
Fax: +44(0) 1740 626061
From: lwip-users
[mailto:[email protected]] On Behalf Of
goldsimon
Sent: 27 June 2016 18:22
To: Mailing list for lwIP users <[email protected]>
Subject: Re: [lwip-users] Correct way to free pbufs after tcp_recv callback
finished
Please read doc/rawapi.txt where this is documented.
Noam, I'm a bit confused. The PCB passed to the recv callback should be the one
passed to tcp_recved. To handle the listen callback, this is different...
Simon
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Am 27. Juni 2016 5:31:01 nachm. schrieb Noam Weissman
<[email protected]<mailto:[email protected]>>:
Hi,
You need to call pbuf_free(pcb) after you finish processing the data.
Also you need to call tcp_recived after you handled the data. You call it NOT
with the pcb that you get inside the recv call back but rather your SERVER pcb.
The one created after calling listen.
I am not at my working PC so I cannot add an example but search around you
will see what I mean.
BR,
Noam.
________________________________
From: lwip-users
<[email protected]<mailto:[email protected]>>
on behalf of Gabriel Harrison
<[email protected]<mailto:[email protected]>>
Sent: Monday, June 27, 2016 1:41 PM
To: [email protected]<mailto:[email protected]>
Subject: [lwip-users] Correct way to free pbufs after tcp_recv callback finished
Hi,
We've started our first lwIP project, following the instructions on
http://lwip.wikia.com/wiki/Raw/TCP to create our high level functions and
taking the device level IRQ functions and ethernetif.c from the SDK for our
chip (Freescale Kinetis K60)
Raw/TCP - lwIP Wiki - Wikia<http://lwip.wikia.com/wiki/Raw/TCP>
lwip.wikia.com
Initialization Edit. lwip_init() must be called before any tcp functions are
called. void tcp_tmr(void) After lwip_init() is called, you must call tcp_tmr
...
Although we appear to have set things up correctly - we can send & receive
requests - the TCP pbufs pool is not running out and it looks like they are not
being freed after the receive has been processed.
I can see in tcp_recv_null in tcp.c that pbuf_free(p); is called after
tcp_recved(pcb, p->tot_len); but I can't find any info about freeing the pbufs
in the wiki via either pbuf_free or pbuf_free_callback.
Should I be calling pbuf_free/ pbuf_free_callback in our receive callback or is
this supposed to be handled elsewhere?
Thanks,
Gabriel
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