Thanks, Graham. Sorry for too late answer )) Now i am testing... 21.02.2015, 14:42, "Graham Leggett" <minf...@sharp.fm>: > On 21 Feb 2015, at 12:58 PM, Serj Rakitov <ra...@yandex.com> wrote: >> I set socket to non-blocking mode. >> >> 1. If I do SSL_read() and get result <=0 and then SSL_get_error() returns >> SSL_ERROR_WANT_WRITE what must I to do? >> Is it enough to call SSL_write(ssl,0,0) one time and then again call >> SSL_read() untill it successed. Is this right? >> >> 2. If I do SSL_write() and get result <=0 and then SSL_get_error() returns >> SSL_ERROR_WANT_READ what must I to do? >> If I must read some data can it be application data or no? So, if I call >> SSL_read(ssl,buf,buf_size) must I waiting in buf some application data or >> never? >> And after I did SSL_read(ssl,buf,buf_size) then I must again call >> SSL_write() untill it returns with success? >> >> 3. Can be this situation: SSL_write() returns <=0 and then SSL_get_error() >> returns SSL_ERROR_WANT_WRITE? >> What to do in this case for non-blocking socket? > > In both cases you return back to your poll and ask the OS to wait for the > event that openssl asked for. If openssl asked for read, you poll until the > socket is readable. If openssl asked for a write, you poll until the socket > is writable. > > When you get the event you asked for, you just run whatever you were running > again. For example, if you were running SSL_read, run SSL_read again. If you > were running SSL_write, run SSL write again. > > So to write it out: > > - Call SSL_read(), it returns SSL_ERROR_WANT_WRITE > - Poll for the socket being writable. > - It’s writable! call SSL_read() again. it might return SSL_ERROR_WANT_READ > - Poll for the socket being readable. > - It’s readable! Call SSL_read() again, and so on. > > If openssl wants read, poll for read. If openssl wants write, poll for write. > Don’t arbitrarily swap round SSL_read and SSL_write, those two calls are what > *you* want to do, not what openssl wants to do. > > Regards, > Graham
-- Best Regards, Serj Rakitov _______________________________________________ openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
