[lwip-users] Re: [lwip] tcp_pcb_purge() function - question

[Adam Dunkels]

Hi!

On Thursday 24 January 2002 15.42, you wrote:
> In the function tcp_pcb_remove - there is a  call to the function -
> tcp_pcb_purge(). My question is regarding to the condition in this function
> (tcp_pcb_purge) - why there is a check for the state to be LISTEN ,
> TIME_WAIT or CLOSED. If the pcb is going to be removed , whould have
> expected to delete all the segments on this socket? - Doesn't this could
> cause to memory leak? Thanks.

The check is made becase connections in LISTEN, TIME-WAIT or CLOSED doesn't 
have any queued segments. Connections in LISTEN are also handled by a smaller 
structure than the tcp_seg struct, so they doesn't even have such a queue, so 
calling tcp_segs_free() could produce some very dangerous results. 
(Connections in TIME-WAIT used to be handled by a smaller structure as well, 
but this was changed for version 0.4.x.)

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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