On 10/8/2017 7:28 AM, Michel wrote:
While I understand that using non-blocking descriptors is a better practice,
I still do not see why select() should NEVER be used for blocking sockets
(except when combined/interfered with the internal OpenSSL state machine or
equivalent mechanism).
Could you please elaborate or give an example ?
Regards,
Michel.
Example: You call select(), it returns the descriptor as readable, you
pass it into SSL_read(), and SSL_read() blocks. You are worse off than
before you used select() since you made the incorrect assumption that
you could do something when select() returns and not have a blocking
socket block.
Just because select() says that something is readable (or writable) does
not actually make it so. The function only makes sense for non-blocking
descriptors. The use of select() with a blocking descriptor is always
wrong.
Non-blocking code is actually easier to implement than you think.
--
Thomas Hruska
Shining Light Productions
Home of BMP2AVI and Win32 OpenSSL.
http://www.slproweb.com/
--
openssl-users mailing list
To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
