4.1 Exceptions

We realized early that most of the exceptions would be raised by the I/O functions of OpenSSL, so it felt natural to mimic OpenSSL's error code system, translating them into Python exceptions. This naturally gives us the exceptions SSL.ZeroReturnError, SSL.WantReadError, SSL.WantWriteError, SSL.WantX509LookupError and SSL.SysCallError.

For more information about this, see section 3.3.