On Mon, Nov 26, 2001 at 11:39:26AM +0100, Rygg Christian Ingemann wrote:
> Hi!
>
> I'm making a few objects that are communicating with eachother using SSL. It
> almost works now, but I want my client to read from the connection until
> there are no more to read, without knowing how much the server is sending. I
> thought using SSL_pending() would do the trick. However, the call to
> SSL_pending() always returns 0, even though there is something to read: If I
> comment it out, the client reads line after line, but hangs when there is no
> more to read. Why does it return 0 if there is something to read?
SSL_pending() only returns the number of bytes that are still buffered.
The data are sent in blocks, and if the last SSL_read() operation did
not retrieve all bytes from this block, SSL_pending() will tell you
how many bytes are left.
(Consider a block of 100 bytes. If SSL_read() only queried 50 bytes,
SSL_pending() will tell you, that 50 bytes are left.)
If no bytes are currently in the buffer, SSL_pending will return 0,
only the next call to SSL_read() will trigger the processing of the
next block of bytes.
If you want to know, whether there are still data coming from the peer,
you must use non-blocking sockets and select() on read, when the buffer is
empty.
Best regards,
Lutz
--
Lutz Jaenicke [EMAIL PROTECTED]
BTU Cottbus http://www.aet.TU-Cottbus.DE/personen/jaenicke/
Lehrstuhl Allgemeine Elektrotechnik Tel. +49 355 69-4129
Universitaetsplatz 3-4, D-03044 Cottbus Fax. +49 355 69-4153
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