On Sat, Mar 07, 2015, dE wrote: > > Suppose, I write a small amount of data with SSL_write. Will openssl > accumulate these writes to make a single big fragment and then send > it, or will it send it the moment it receives the data, as a single > fragment? No it tries to send the data with each call. That's because you might (for example) be using a character mode application which should send each keypress as soon as possible. If you use BIOs you can make use of a buffering BIO which will accumulate writes until either the buffer is full or you explicitly flush it. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org