Non-blocking accept call ...

[David Brock]

I'm a little confused as to how to manage a non-blocking accept call.  
Specifically I don't understand what the expected return from 
BIO_do_accept() should be when non-blocking is turned on. How can I tell 
that the BIO_do_accept() call returned because it is non-blocking vs. an 
actual error occurred?

My code looks like:
       if ( useNonBlocking == TRUE )
       {
               BIO_get_fd(acc, &acceptFD);
               flags = fcntl(acceptFD, F_GETFL);
               flags |= O_NONBLOCK;
               fcntl(acceptFD, F_SETFL, flags);
       }
       ret = BIO_do_accept(acc);
       if  ( ret <= 0)
       {
               /* Failed to accept a connection */
               return ret;
       }
When I turn nonblocking on the call to BIO_do_accept returns -3. Should 
I just always check for -3, or is there an enum I can check, or some 
method (similar to SSL_get_error() where I can see something like 
SSL_ERROR_WANT_READ) I can call?

Thanks,
                      -David-
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