setsockopt problem

[Jos-Ven]

In cforth/src/app/esp32/server.fth I found:
\ Set SO_LINGER so lwip-close does not discard any pending data
\ 8 &linger $80 $fff r@ setsockopt drop

When I tried that option in a new word setsockopt always returns -1
So, I do not think the option SO_LINGER is active.

The used code is:

\ create &linger 1 , 5 , \ on , 5 seconds, see server.fth
create &linger2 1 , 5
: set-socketopt ( SocketAfterAccept - )

r 8 &linger $80 $fff r@ setsockopt cr .s drop \ setsockopt always returns -1
\ 8 &linger2 $80 $fff r@ getsockopt cr .s drop \ getsockopt crashes cforth
r> drop ;

\ Note: r should be ">r"

: http-responder ( timeout -- )
timed-accept if exit then
dup set-socketopt
req-buf /req-buf rot lwip-read ( len )
req-buf swap handle-request
1 ms ;
How can the problem at setsockopt be solved ?
Thanks in advance, Jos

[MitchBradley]

This thread says:

The reason for the ENOPROTOOPT result is that in ESP-IDF we don't build LWIP with LWIP_SO_LINGER enabled, so the feature isn't available.

I think that you would need to configure esp-idf to turn it on. I'm not sure about this, but I think the right way would be to go into /components/lwip/include/lwip/port/lwipopts.h and, in the Socket options section, add this line:

#define LWIP_SO_LINGER 1

[Jos-Ven]

Thank you, now it works!
Kind regards, Jos