Re: [lwip-users] Implementing Ftp File Transfert : Non blocking Send ?

[Jonathan Larmour]

Paul THILLOY wrote:
> if the transfert is interrupted by some disconnection...then it is 
> impossible to leave the send or write function...Am I doing something 
> wrong ?

I remember people before saying the timeouts are just very very long, 
something like a few hours IIRC. However looking at the code, I can't find 
any code that will terminate a connection unless you use the SO_KEEPALIVE 
socket option. For my own interest, I'd be grateful if someone could tell 
me where this is done when keepalives are off.

Nevertheless you can use that option with setsockopt(). You can also 
change the keepalive timeouts by enabling LWIP_TCP_KEEPALIVE in 
lwipopts.h, and then using either TCP_KEEPALIVE or TCP_KEEPIDLE, possibly 
also with TCP_KEEPINTVL and TCP_KEEPCNT options. Look at 
include/lwip/sockets.h, and note that include/lwip/tcp.h has the defaults 
and note what it says about RFC 1122.

Jifl
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