> - Do some "kernel grovelling" to find out the Send Buffer free
> space. I don't want to go this deep to get the information,
> because I'm pretty sure I'd somehow screw things up and cause
> myself myriad other problems

Ah, so a thought...  (maybe already voiced -- I lost the bubble on
this thread).

I think netstat will report on the status of the buffer.  Grab the
code and see how they do it.  Likely they dig around in the kernel
memory.  But, if they already have a method of doing it that you
could integrate into your app the chances of busting things wlll go
down.

allman