Re: [lwip-users] Missing SOL_TCP?

[Ian Abbott]

On 13/04/2022 15:45, Grant Edwards wrote:
> It appears that there is code in lwip_getsockopt_impl to handle
> setting tcp keepalive values via the keys TCP_KEEPIDLE, TCP_KEEPINTVL,
> and TCP_KEEPCNT.
>
> Using the Berekely socket API, these are set via calls to setsocktopt():
>
>      setsockopt(s, SOL_TCP, TCP_KEEPxxxx, &n, sizeof n);
>
> However, the only SOL_xxx "level" constant I can find defined by LWIP
> is SOL_SOCKET, and those keys are ignored for that level.
>
> Where are the definitions for other SOL_xxxxx values (e.g. SOL_TCP)
> supposed to come from?

Use IPPROTO_TCP instead of SOL_TCP as the "level".

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