[freetds] Weird tsql behaviour

James K. Lowden james.k.lowden at icloud.com
Sat Jan 30 13:21:28 EST 2016

On Fri, 29 Jan 2016 20:54:44 +0000
"Thomas, Christopher (LLU)" <cwthomas at llu.edu> wrote:

> Once I connected to the database server using tsql, the line numbers
> started to go up and up, automatically. About one digit per second. 

Those "line numbers" are a counter that appears while a connection
request is pending.  It disappears when the connection succeeds.  And,
yes, they should be really, really close to 1 second apart!  ;-)  

Under the hood, libtds connects to the server using nonblocking I/O.
connect(2) usually returns with EINPROGRESS or similar, and the library
uses poll(2) to wait for the connection to complete.  You can see
evidence of that in a typical TDSDUMP log.  

The above information should be in the man page, but isn't.  Sorry
about that, Chief.  


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