| lwIP
    2.1.2
    Lightweight IP stack | 
#include <tcp.h>
| Data Fields | |
| tcp_extarg_callback_pcb_destroyed_fn | destroy | 
| tcp_extarg_callback_passive_open_fn | passive_open | 
A table of callback functions that is invoked for ext arguments
| tcp_extarg_callback_pcb_destroyed_fn tcp_ext_arg_callbacks::destroy | 
| tcp_extarg_callback_passive_open_fn tcp_ext_arg_callbacks::passive_open |