[lwip-users] callback function args in lwip 1.3

[Hans Jacob Moller]

Hello,

 

Im all new to this list so hello every one J.

 

Im using the release candidate of lwip 1.3, raw api.

First just to make sure I haven’t misunderstood something; The “void *arg” that you can bind to a pcb via tcp_arg(); is a pointer to whatever instance data that you want back when your callback functions are called e.g the callback function defined by tcp_accept(). If this is correct my problem is that I register a pointer to some instance data after I call tcp_listen and then register a callback function with tcp_accept. When the callback is called the arg pointer is NULL.

 

What I do :

 

Allocate inst pointer and fill ind some values.

.

newpcb = tcp_listen(oldpcb);

tcp_arg(newpcb,inst);

tcp_accept(newpcb, acceptConnect);

 

in

err_t acceptConnect(void *arg, struct tcp_pcb *newpcb, err_t err)

arg seems to be NULL when it is called from the lwip stack….

 

Any idea what could be wrong ?

Thanks

 

Hans Jacob Møller

Software Engineer

CSR Denmark
Niels Jernes Vej 10

9220 Aalborg O

Denmark

http://www.csr.com

 

Company Telephone Number     +45 99 324 100

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