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  • Peng Zheng thinks this is interesting:

The problem we need to solve in the I/O loop is that once we’ve made a call to an SSL I/O function, and it requires a retry, we should not call other I/O functions until the original call has succeeded.

From

Cover of Network Security with OpenSSL

Note

https://groups.google.com/forum/#!topic/mailing.openssl.dev/gJjZugecTSs It might be wrong!