FreeTDS Development Group

[ZIGLIO Frediano <Frediano.Ziglio AT vodafoneomnitel.it>]

Ok, understood the problem.

You send cancel
Server return a cancel only-header packet.
tds_process_cancel read a byte. 
If only-header packet is received tds_get_byte return a zero.
tds_process_cancel on received zero act as a done/cancel token (this patch
is not so good, see diff between version 1.25 and 1.26 in token.c at
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/freetds/freetds/src/tds/token
.c.diff?r1=1.25&r2=1.26&sortby=date, IMHO should be removed..).
Replacing the if in tds_get_byte with a while whould resolve partially the
problem.

Note that while sending cancel server can send another packet...
I suggest to add a TDS_CANCELLING state, read should discard all packet in
cancelling and stop reading the only-header cancel packet, then change state
(TDS_CANCELLED ??) and act in the usually mode.

Also before sending cancel packet we should discard partial packet (just a
init packet before sending it).

Seem not so difficult but should be tested accurately...

freddy77

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