Re: invoking GDB from FE and signals

[Jim Blandy <jimb@codesourcery.com>]

Bob Rossi <bob_rossi@cox.net> writes:
> On Sun, May 14, 2006 at 12:16:53AM -0400, Daniel Jacobowitz wrote:
>> On Sun, May 14, 2006 at 09:57:00AM +1200, Nick Roberts wrote:
>> > does it do when SIGINT is read" (which is sent by ~c^c).  Well it just works
>> > like it does in a terminal but then I was surprised when Daniel said:
>> > 
>> >     When the inferior is running and you press Control-C, the signal goes to
>> >     the inferior, not to GDB.
>> > 
>> > because I had thought it was the other way round and GDB could decide whether
>> > to pass the signal on to the inferior or not according to the output of
>> > "info signal".
>> 
>> Job control signals are funny.  The C-c sends a signal to the process
>> group in control of the current terminal, and when the inferior is
>> running, GDB makes sure that it "owns" the terminal (so that it won't
>> e.g. be automatically stopped with SIGTTIN if it tries to read()).
>> 
>> This all predates 'set tty' of course.
>
> O, right. The tty command. I definatly use that for the inferior which I
> believe emacs does not. Nick, do you know if emacs uses the 'set tty'
> command?

When you use GDB in the normal way, 'M-x gdb', it doesn't.