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< L<SSL_write(3)|SSL_write(3)> function.
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> L<SSL_write(3)|SSL_write(3)> function).
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> SSL_read() works based on the SSL/TLS records. The data are received in
> records (with a maximum record size of 16kB for SSLv3/TLSv1). Only when a
> record has been completely received, it can be processed (decryption and
> check of integrity). Therefore data that was not retrieved at the last
> call of SSL_read() can still be buffered inside the SSL layer and will be
> retrieved on the next call to SSL_read(). If B<num> is higher than the
> number of bytes buffered, SSL_read() will return with the bytes buffered.
> If no more bytes are in the buffer, SSL_read() will trigger the processing
> of the next record. Only when the record has been received and processed
> completely, SSL_read() will return reporting success. At most the contents
> of the record will be returned. As the size of an SSL/TLS record may exceed
> the maximum packet size of the underlying transport (e.g. TCP), it may
> be necessary to read several packets from the transport layer before the
> record is complete and SSL_read() can succeed.
>