From 715020e3342685fd003478e2d6ee9993fd2d47db Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Wed, 6 Sep 2006 11:53:50 +0000 Subject: [PATCH] Add an FAQ. --- FAQ | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/FAQ b/FAQ index f2a383a297..8f89f30d54 100644 --- a/FAQ +++ b/FAQ @@ -67,6 +67,7 @@ OpenSSL - Frequently Asked Questions * Why doesn't my server application receive a client certificate? * Why does compilation fail due to an undefined symbol NID_uniqueIdentifier? * I think I've detected a memory leak, is this a bug? +* Why doesn't a memory BIO work when a file does? =============================================================================== @@ -916,5 +917,24 @@ thread-safe): ERR_free_strings(), EVP_cleanup() and CRYPTO_cleanup_all_ex_data(). +* Why doesn't a memory BIO work when a file does? + +This can occur in several cases for example reading an S/MIME email message. +The reason is that a memory BIO can do one of two things when all the data +has been read from it. + +The default behaviour is to indicate that no more data is available and that +the call should be retried, this is to allow the application to fill up the BIO +again if necessary. + +Alternatively it can indicate that no more data is available and that EOF has +been reached. + +If a memory BIO is to behave in the same way as a file this second behaviour +is needed. This must be done by calling: + + BIO_set_mem_eof_return(bio, 0); + + =============================================================================== -- 2.25.1