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Pedro Alves 6f64ef53c0 GDB kills itself instead of interrupting inferior
When GDB is run with IO redirected to a pipe, the 'interrupt' command
causes it to kill its own process group instead of the inferior's.
The problem manifests itself in async mode, native debugging:

    $ cat | gdb <file>
    (gdb) set target-async on
    (gdb) run &
    (gdb) interrupt
    A debugging session is active.
    Inferior 1 [process 20584] will be killed.
    Quit anyway? (y or n) [answered Y; input not from terminal]

In this case, GDB tells that its stdin isn't a tty and doesn't save
the inferior's process group in
inflow.c:terminal_init_inferior_with_pgrp.  The 'interrupt' command
tries to 'kill' the inferior's process group in
`inf-ptrace.c:inf_ptrace_stop`, but since that wasn't saved in the
first place, GDB kills process group 0, meaning, its own process
group.

When GDB is used from a frontend, that means killing its own process
group including the frontend and possibly the X session.  This was
originally seen with SublimeGDB:
  https://github.com/quarnster/SublimeGDB/issues/29.

The patch makes GDB save the inferior pgid regardless of having a
terminal, as pgid is used not only to reset foreground process group,
but also to interrupt the inferior process.  It also adds a regression
test.  Luckily, we can emulate not having a terminal with "set
interactive-mode off", avoiding the need of special magic to spawn gdb
with a pipe.

Tested on x86_64 Fedora 17.

gdb/
2013-07-26  Cyril Nikolaev  <cyril@nichtverstehen.de>

	* inflow.c (terminal_init_inferior_with_pgrp): Save inferior
	process group regardless of having tty on stdin.

gdb/testsuite/
2013-07-26  Pedro Alves  <palves@redhat.com>

	* gdb.base/interrupt-noterm.c, gdb.base/interrupt-noterm.exp: New
	files.
2013-07-26 11:15:45 +00:00
bfd daily update 2013-07-26 00:00:04 +00:00
binutils PR binutils/15745 2013-07-19 10:44:01 +00:00
config 2013-04-30 Jan-Benedict Glaw <jbglaw@lug-owl.de> 2013-04-30 12:40:42 +00:00
cpu PR binutils/15241 2013-03-08 17:25:12 +00:00
elfcpp elfcpp/ 2013-03-01 22:45:56 +00:00
etc
gas opcodes/ 2013-07-25 19:11:39 +00:00
gdb GDB kills itself instead of interrupting inferior 2013-07-26 11:15:45 +00:00
gold gold/ 2013-07-19 23:07:08 +00:00
gprof * aarch64.c (aarch64_find_call): Promote to bfd_vma before sign 2013-05-24 00:28:06 +00:00
include Support Intel MPX 2013-07-24 15:47:25 +00:00
intl
ld Check .gnu.warning section in shared library 2013-07-24 17:24:20 +00:00
libdecnumber merge from gcc 2013-07-09 16:04:44 +00:00
libiberty merge from gcc 2013-07-22 18:03:12 +00:00
opcodes opcodes/ 2013-07-25 19:11:39 +00:00
readline readline/ 2013-05-22 09:51:49 +00:00
sim move version.in from gdb/common back to gdb 2013-06-28 18:59:51 +00:00
texinfo
.cvsignore
.gitignore Sync the root .gitignore file with GCC's. 2013-01-11 15:17:35 +00:00
ChangeLog src-release: Fix VER computation for TOOL=gdb 2013-07-22 15:17:20 +00:00
compile
config-ml.in
config.guess * config.guess: Update from config repo. 2013-04-29 15:13:53 +00:00
config.rpath
config.sub * config.guess: Update from config repo. 2013-04-29 15:13:53 +00:00
configure 2013-07-10 Jack Howarth <howarth@bromo.med.uc.edu> 2013-07-10 20:55:59 +00:00
configure.ac 2013-07-10 Jack Howarth <howarth@bromo.med.uc.edu> 2013-07-10 20:55:59 +00:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS 2013-01-07 Jeff Johnston <jjohnstn@redhat.com> 2013-01-07 21:39:26 +00:00
COPYING.NEWLIB 2013-05-06 Sandra Loosemore <sandra@codesourcery.com> 2013-05-06 18:31:56 +00:00
depcomp
djunpack.bat
install-sh
libtool.m4 PR target/38607 2012-09-14 23:55:22 +00:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def 2013-04-22 Jan-Benedict Glaw <jbglaw@lug-owl.de> 2013-04-22 17:11:22 +00:00
Makefile.in 2013-04-22 Jan-Benedict Glaw <jbglaw@lug-owl.de> 2013-04-22 17:11:22 +00:00
Makefile.tpl * Makefile.tpl (BOOT_ADAFLAGS): Remove -gnata. 2013-01-11 11:48:54 +00:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release src-release: Fix VER computation for TOOL=gdb 2013-07-22 15:17:20 +00:00
symlink-tree
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.