Re: [lwip-users] http_sent cb shows 1 byte trailer [RAW]

[address@hidden]

Chris Strahm wrote:
> > > Maybe recursion?
> > > Where is close_conn being called from here?
> > >       
>
> It comes from my send_data() routine.
> Once all of the data to send has been written to tcp_write(),
> then close_conn gets called, and send_data() returns.
>
> I scratched my head for a while trying to understand
> how this all worked.  tcp_write() is just sending the
> data to the queue, it has not yet been delivered,
> yet close_conn() gets called.
>   

tcp_close() (like tcp_write()) only enqueues a segment (containing a FIN 
only, in this case) to be sent. This segment (like all other data) is 
re-sent until an ACK is received for it. Only after this ACK has been 
received, the connection actually goes into a real closing state.

However, that still doesn't explain why close_conn() is called twice or 
why arg is NULL.

> Well based on what the guys have now said, I guess it is all working, or at
> least acting the way it is suppose to.
>   

Not really. I don't see arg being null in any of the functions.

Simon