Re: [RFA] Remote UDP support

[Daniel Jacobowitz <drow at mvista dot com>]

On Thu, May 09, 2002 at 11:23:45AM -0700, Michael Snyder wrote:
> Daniel Jacobowitz wrote:
> > 
> > On Wed, May 08, 2002 at 10:56:35PM -0400, Andrew Cagney wrote:
> > > >>- it wasn't necessary - there are micro tcp implementations around that
> > > >>implement sufficient TCP for the remote protocol to work
> > > >
> > > >
> > > >Still bigger than a polled UDP implementation, and much more
> > > >complicated.  Implementing a tiny UDP stack is simple!  Sure, it isn't
> > > >reliable at all; so use it on small networks and be careful :)
> > >
> > > >>One theory put forward was to have GDB print a banner(6) sized warning
> > > >>(and get confirmation) before accepting the option.
> > > >
> > > >
> > > >I have to admit, I don't see the point.  A big warning in the
> > > >documentation, maybe, but such a confirmation query would drive me
> > > >crazy if I actually needed to use this regularly.
> > >
> > > That is the point!  I don't want to be around when someone that (shock
> > > horror :-) fails to read the manual and then complains that the GDB
> > > remote protocol isn't reliable.  What about a:
> > 
> > The only place I documented the syntax is in the manual.  Good luck
> > finding it otherwise :)
> 
> "help target remote"?

I didn't add it; I probably ought to.

Andrew, would you be satisfied with a warning in the manual and a
warning in 'help target remote'?

> > > set remote
> > > i-do-not-understand-gdb-remote-protocol-and-foolishly-think-udp-works-so-please-enable-it
> > >  on
> > >
> > > option.
> > >
> > > Have you tried running the testsuite across UDP?
> > 
> > Have you tried running the testsuite with gdbserver on a remote
> > machine? :P  
> 
> Yes, it was certainly working some time (recently too, I think).
> Have you looked at testsuite/config/gdbserver.exp?

That works for testing with gdbserver on the _local_ machine.  Note
that it uses remote_spawn "host" to start gdbserver, and does not copy
the binary to target.  I'll submit a patch once I sort out the changes
that I needed to make to dejagnu/lib/remote.exp.

It also does not work on the MI tests; I've submitted a patch and filed a
GNATS PR about this some time ago.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer