[lwip-devel] close listening socket with linger enabled

[代尔欣]

Hi lwip dev,

    I met an assert issues when close listening socket with linger enabled.

in lwip_netconn_do_close_internal()

{

...

  if(shut_close){

    tcp_arg(tpcb, NULL); //pcb->callback_arg is NULL

  }

  if(shut_close){

#if LWIP_SO_LINGER

...

    tcp_abort();//assert happened in this call

...

#endif

  }

...

}

api_msg.c::err_tcp() will be called in following process tcp_abort()==>tcp_abandon==>TCP_EVENT_ERR==>err_tcp

because err_tcp will assert if first input para is NULL which is pcb->callback_arg. it already be cleared.

It seems tcp_arg(tpcb, NULL); called too early if need call user callback to notify err event?