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Re: invoking GDB from FE and signals
Jim Blandy <jimb@codesourcery.com> writes:
> Andreas Schwab <schwab@suse.de> writes:
>> Bob Rossi <bob_rossi@cox.net> writes:
>>
>>> I find in emacs:process.c code that they send the SIGINT in different
>>> ways
>>> /* If possible, send signals to the entire pgrp
>>> by sending an input character to it. */
>>>
>>> /* TERMIOS is the latest and bestest, and seems most likely to
>>> work. If the system has it, use it. */
>>> case SIGINT:
>>> sig_char = &t.c_cc[VINTR];
>>> break;
>>> ...
>>> send_process (proc, sig_char, 1, Qnil);
>>
>> This part is only active if SIGNALS_VIA_CHARACTERS is defined. That is
>> defined mostly for BSD-derived systems, but not, for example, for Linux.
>> The fallback is to send the signal to the foreground process group of the
>> terminal.
>
> Do you know why they prefer that approach on Linux?
According to s/gnu-linux.h:
/* Let's try this out, just in case.
Nah. Rik Faith <faith@cs.unc.edu> says it doesn't work well. */
/* #define SIGNALS_VIA_CHARACTERS */
1993-06-09 Jim Blandy (jimb@wookumz.gnu.ai.mit.edu)
* s/linux.h (SIGNALS_VIA_CHARACTERS): Don't #define this.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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