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Re: invoking GDB from FE and signals


On Mon, 2006-05-15 at 15:43 -0400, Bob Rossi wrote:
> On Mon, May 15, 2006 at 03:17:14PM -0400, Daniel Jacobowitz wrote:
> > On Mon, May 15, 2006 at 02:18:21PM -0400, Bob Rossi wrote:
> > > OK, here's what happens from the FE perspective though. You type ^c. The
> > > FE get's the signal (which is in a different process group than GDB),
> > > and passes the signal to GDB with 'kill (gdb_pid, SIGINT)'.
> > 
> > Jim just explained this, but it may not have been clear: that is the
> > wrong way to forward the signal.  If you are running GDB on a
> > pseudo-tty, you need to forward the job control signal to that TTY, not
> > to the GDB process itself.
> > 
> > I don't really know how to do that.  Is it by setting BRKING in
> > termios?  There's something about TIOCSIGNAL too.  Lots of code for
> > this in emacs.
> 
> I'm totally confused. I'm certainly not an expert, but sending a signal
> can only be done to a pid using kill. What other ways are there?
> 
> Bob Rossi

Two things:
1) Yes the only way to send a signal to a *pid* is with kill.  But which
pid?  DO NOT SEND THE SIGNAL TO GDB!  Send it to GDB's inferior.  
2) Danial is not asking you to send a signal to a pty, he is asking you
to send a signal to GDB's inferior *via* the pty, by using an ioctl
function and suggesting that code exists in EMACS to do just that.

-=# Paul #=-


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