old-cross-binutils/gdb/testsuite/gdb.base/interrupt-noterm.exp

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# Copyright (C) 2013-2014 Free Software Foundation, Inc.
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
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
standard_testfile
if [prepare_for_testing "failed to prepare for testing" \
${testfile} ${srcfile} {debug}] {
return -1
}
# Pretend there's no terminal.
gdb_test_no_output "set interactive-mode off"
gdb_test_no_output "set target-async on"
if ![runto main] {
fail "Can't run to main"
return -1
}
# Delete breakpoints so that the next resume is a plain continue,
# instead of a step-over-breakpoint sequence just while GDB sends the
# interrupt request. If that's buggy on some targets (and it was on
# target remote for a while, where a ctrl-c at the wrong time will get
# lost), then it should get its own specific test. Disable
# confirmation, avoiding complications caused by the fact that we've
# disabled the terminal -- GDB would auto-answer "yes", confusing
# gdb_test_multiple.
gdb_test_no_output "set confirm off"
gdb_test_no_output "delete"
gdb_test_no_output "set confirm on"
set async_supported -1
set test "continue &"
gdb_test_multiple $test $test {
-re "Continuing\\.\r\n$gdb_prompt $" {
set async_supported 1
pass $test
}
-re ".*Asynchronous execution not supported on this target..*" {
unsupported $test
}
}
if { $async_supported < 0 } {
return 1
}
# With native debugging, and no terminal (emulated by interactive-mode
# off, above), GDB had a bug where "interrupt" would send SIGINT to
# its own process group, instead of the inferior's.
set test "interrupt"
gdb_test_multiple $test $test {
-re "interrupt\r\n$gdb_prompt " {
pass $test
}
}
set test "inferior received SIGINT"
gdb_test_multiple "" $test {
-re "\r\nProgram received signal SIGINT.*" {
# This appears after the prompt, which was already consumed
# above.
pass $test
}
}