Excuse me please,
  but i don't understand how can i get revents for extra_fds passed to
curl_multi_wait.
  I looked into multi.c and it is seems revents for extra_fds is
discarded after call to Curl_poll.

Is'nt there should be something like this in multi.c:

23d22
<
812c811
< unsigned int i, j;

---
>   unsigned int i;
913,916d911
<
<   for(j = nfds - extra_nfds; j < nfds; ++j){
<     extra_fds[j].revents = ufds[j].revents;
<   }
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