I'm not sure what to make of that. I would assume that we've got a blocking BIO, because it is - d'oh - blocking. But I don't see how you influence what kind of BIO you use.A BIO is non-blocking if the underlying file (socket) descriptor has the O_NONBLOCK flag set, either during open or by a previous call to fcntl(). And yes, if O_NONBLOCK was not set on a socket, then any OpenSSL operations can block pretty much indefinitely.
Thanks for the explanation. -- Sebastian Hagedorn - Postmaster - RZKR-R1 (Flachbau), Zimmer 18 Zentrum für angewandte Informatik - Universitätsweiter Service RRZK Universität zu Köln / Cologne University - Tel. +49-221-478-5587
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