Right, but let's say I'm doing an SSL_write, and I get a WANT_READ error. I then select on the socket until data is available for reading. I then call SSL_read. If all that was sent was the protocol data that the write was waiting for to satisfy the ssl state machine, and no application data was sent, would SSL_read return the number of bytes actually read off the socket (which is just protocol data), or would it read that transparently and return 0 indicating that no application data was read? Or would it just read the required protocol data and return an error of WANT_READ to indicate that I should retry the SSL_read when more data arrives? Now that I think about it, I'm guessing the latter.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > Sent: Sunday, April 17, 2005 9:48 PM > To: openssl-users@openssl.org > Subject: Re: Confusion about SSL_ERROR_WANT_READ/WRITE > > A return result of 0 typically means the other side closed > the connection. > > Here is the section from SSL_read's man page with regards to > a 0 return: > > 0 The read operation was not successful. The reason > may either > be a > clean shutdown due to a "close notify" alert sent > by the peer (in > which case the SSL_RECEIVED_SHUTDOWN flag in the > ssl shutdown state > is set (see SSL_shutdown(3), > SSL_set_shutdown(3)). It is also pos- > sible, that the peer simply shut down the > underlying transport and > the shutdown is incomplete. Call SSL_get_error() > with the return > value ret to find out, whether an error occurred > or the connection > was shut down cleanly (SSL_ERROR_ZERO_RETURN). > > > -Joe > > > > On Apr 17, 2005, at 9:12 PM, Edward Chan wrote: > > > Does SSL_read always return the number of bytes of application data > > read? > > If so, that means that SSL_read could return 0, and that > this should > > not be construed as an error. > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
