[openssl-users] Graceful shutdown of TLS connection for blocking sockets
Thomas J. Hruska
shinelight at shininglightpro.com
Mon Oct 9 13:31:49 UTC 2017
On 10/9/2017 1:32 AM, Michel wrote:
>> With blocking sockets, you just loop back around and repeat the same call
> if either of those messages are returned by SSL_get_error(). No select()
> Yes, you have to repeat the same call, but select() is still usefull,
> especially with blocking sockets.
And leads to incorrect code and weird blocking scenarios. Been there,
done that. You're using select() wrong. If you want to block, then
block and don't try to hack around it. Otherwise use non-blocking.
This common misunderstanding of select() is precisely why calling it
with a blocking descriptor should trigger an exception that kills the
application. Doing so would bring a quick end to a lot of bad code.
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