select + record_recv

Nikos Mavrogiannopoulos nmav at
Sun Jul 11 12:34:21 CEST 2010

Sam Varshavchik wrote:
> Nikos Mavrogiannopoulos writes:
>> In the early versions of GnuTLS I implemented a hack in order to use
>> select() to check whether there are data to read from the gnutls
>> session. Is this feature actually used? If you want to check for data in
>> a gnutls_session how do you do it?
> I always thought that the correct logic is:
> 1) Non-blocking sockets are a must.
> 2) Check what gnutls_record_check_pending() tells you, first.

So do you traverse over all gnutls sessions and use the pending function?

> 23 If there's nothing pending, poll() or select(), and if it indicates
> that data is available, try gnutls_record_recv().
> Now, if gnutls_record_recv() hands you back some data, you do have to
> consume it. However, this logic seems to work reliably for me, in
> event-driven situations.

Indeed this looks to be the correct approach.


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