Re: [lwip-users] Understanding Raw TCP PCB allocations.

[address@hidden]

Am 26.04.2021 um 21:24 schrieb Luciano Moretti:
> Hello,
> I'm trying to make sure I understand what's going on.
>
> Here's my understanding:
>
> When I create a listening connection:
> 1. I pass a PCB to tcp_listen(). The passed PCB gets deallocated and a
> new listening PCB is returned.
> 2. When a client connects to my listening socket the accept callback is
> called with a NEW session PCB. The listening PCB is still in existence.
> 3. When I "close" the active TCP connection, I should close the New
> Session PCB that was allocated in 2.
> 4. The listening PCB created in step 1 is still listening and will
> accept any new connections.
> 5. When I want to stop listening, I need to call tcp_close() on the
> listening PCB allocated by tcp_listen() in 1.
>
> So I'm going to have to manage both the listening PCB and an active
> connection PCB for a "listening" socket?

Yes, that's just the same as if you had sockets instead of our pcbs...

Regards,
Simon