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Re: invoking GDB from FE and signals
On Mon, May 15, 2006 at 03:43:14PM -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?
Read it again :-)
You don't want to send the signal to a specific process. You want to
cause the pseudo-terminal to signal the correct process group.
(Also, process group != pid; you can kill negative pids, see a POSIX
reference).
--
Daniel Jacobowitz
CodeSourcery