RE : [lwip-devel] tcp_connect failure not calling connected callback

[Frédéric BERNON]

Hi,

>From memory, with callback api (LWIP_CALLBACK_API=1, which is the default 
>value), tcp_connect is asynchrone (the function return without waiting a error 
>condition or the real connection). 

If you want a "sample" for that, look api_msg.c file (the "raw" part of the 
sequential api). If I resume, a tcp client would be initialize like this (no 
error checking to simplify):

tcp_pcb* pcb = tcp_new();
tcp_arg(pcb, your_arg); /* "your_arg" is a "user data", any value you want to 
get when callbacks are invoked */
tcp_recv(pcb, recv_tcp); /* set "recv callback" */
tcp_sent(pcb, sent_tcp); /* set "send callback" */
tcp_poll(pcb, poll_tcp, 4); /* set "poll callback" */
tcp_err(pcb, err_tcp);   /* set "error callback" */
tcp_bind(pcb, ipaddr, port);
tcp_connect(pcb, ipaddr, port, do_connected); /* set "connected callback" */

After that, the final "result" is known when "do_connected" XOR "err_tcp" is 
called. If you really want to be sure, process both cases (do_connected with 
err!=ERR_OK, and err_tcp), and in general, in any callback which provide an 
erro code (like recv_tcp)...
 
  
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Frédéric BERNON 
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-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de David
Envoyé : jeudi 31 mai 2007 22:18
À : address@hidden
Objet : [lwip-devel] tcp_connect failure not calling connected callback


Hello all,

when tcp_connect is called the stack is supposed to
call the connected callback function with an error
code if the connection can not be made or is rst. at
least that's what it says in the rawapi.txt. instead
the errf callback is called. is the doc just out dated
or is this a mistake ?

thanks
davidb


       
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