some modification of ofp_netwrap, and it does not work,help  #228

i wanna to write a tcp server with ofp netwrap socket api include socket(),bind(),select() e.g based on odp-dpdk

i modify netwrap_crt and netwrap_proc:
1、delete __attribute contructor and destructor before ofp_netwrap_main_ctor() , ofp_netwrap_main_dtor(), and setup_wrappers();
2、i use devbuild_ofp_odp_dpdk.sh to compile all need *.so with slow patch disabled;
3、i link netrwap_ctr.so and netwrap_proc.so to my tcp server exeutable file;
4、i use ofp_netwrap_main_ctor() and setup_wrappers() in my tcp server main() function;
5、in my tcp server project, i use odph_odpthreads_create() to create a thread which running a server function who use select();
6、i modify the ofp_select() who can also handle writefds with below :
int

_ofp_select(int nfds, ofp_fd_set *readfds, ofp_fd_set *writefds,
	    ofp_fd_set *exceptfds, struct ofp_timeval *timeout,
	    int (*sleeper)(void *channel, odp_rwlock_t *mtx, int priority,
			   const char *wmesg, uint32_t timeout))
{
	(void)exceptfds;
	int ready = 0;

	if (is_blocking(timeout) && none_of_ready(nfds, readfds, is_readable) && none_of_ready(nfds, writefds, is_sowriteable))
		sleeper(NULL, NULL, 0, "select", to_usec(timeout));

	ready =  set_ready_fds(nfds, readfds, is_readable);
    ready += set_ready_fds(nfds, writefds, is_sowriteable);

    return ready;
}

int
is_sowriteable(int fd)
{
    struct socket *so = ofp_get_sock_by_fd(fd);
    
    return ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat &&
    (((so)->so_state & SS_ISCONNECTED) || ((so)->so_proto->pr_flags & PR_CONNREQUIRED)==0)) ||
     ((so)->so_snd.sb_state & SBS_CANTSENDMORE) ||
     (so)->so_error);
}

6、modify ofp.cli with replacing eth0 with 0;
7、it can run and default_event_dispatcher thread is also running；

Now tcp server can get the connction from the tcp client and also get the tcp request, then process request and add to select writefds asynchronouslly , and writefd handler use writev to send response, however client don't get the response.

i guess i use writev()(ofp_send() actually) to write, but not really send to client, do you have any idea where is the problem