FreeTDS and buffering on client side

Hi *,

I would like to ask how FreeTDS performs buffering on client side.
I use dblib as my client library (I do not set there DBBUFFER using 
"dbsetopt")

I am trying simulate network failure in such way:
1. connect to MS SQL Server using dbopen()
2. I send SQL select using dbcmd(), dbsqlexec()
3. then I call dbresults()
4. here I pause program and unplug network cable to simulate network error
5. next I process rows in loop calling dbnextrow()

Strange thing is that I can perform step 5 also when network cable is 
unpluged. So I have suspection, that all rows from select are already 
somewhere on client side. Probably handled already by underlaying libtds ?

What is going to happen? Why I can still read rows when there is already 
broken network connection ?
Thanks

-Laco.