FreeTDS Development Group

[Brian Bruns <camber AT umcc.ais.org>]

The unknown marker is basically this...the read() returns 0 when the
connection is closed however the lib doesn't realize it until the next
time it tries to read from the socket at which point the calling function 
(ie dbnextrow()) should return a FAIL. However, I'm not sure all functions
are correctly propagating the error upstream. I need to dig back into it
again, as I thought I had something working (are you using .50 or CVS?)

Brian

On Tue, 18 Jan 2000 richard AT iguana.co.nz wrote:

> > Well, I've got a connection going out, but the other end drops it.
> > Any ideas for the possible causes?  Can the TDS protocol be echoed by a
> > TCP relay?  Or does it contain the IP address of the client?
> > 
> > (Note: I do not administer the other end, and I am doing this access
> > without specific permission.  I do have the ability to access their
> > database via a client they provide, but it only runs on Microsoft
> > Windows so I end up using a remote window session to get at it.  My task
> > is to provide a platform independent web interface to the data on the
> > server.)
> > 
> > Configuration: nestor is a 486/100 running the php3 and freetds code. 
> > idda is a relaying host, accepting connections on port 1433 and
> > transferring them to the actual Microsoft SQL Server over a tunnel
> > running on 56k modem.
> > 
> > When the php script runs, it stalls within the sybase_connect() while
> > the connection is made.  However the connection is closed by the server,
> > and the message "Unknown marker: 0!!" is displayed.  The php script
> > stalls at this point.  Attaching gdb to the process shows the following
> > stack trace;
> 
> The concept of the Unknown market: 0!! error has been plaguing this lib
> for a while now :) If I could narrow down further exactly what is causing
> it I would, as it is I've had to remove the line that prints that
> statement and replace it with a 1 second sleep in order to stop my httpd
> log files from filling up to 2gb each every day (we take a lot of hits)
> 
> However I haven't noticed it impair the functionality of our site in any
> way, so..I'm fairly unsure exactly what those messages are about. Sorry I
> can't be more help, if I do manage to catch a program that consistently
> generates them I'll forward it on.
> 
> Richard
> 
> 
> 
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