213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
96 lines
3.5 KiB
Text
96 lines
3.5 KiB
Text
# Copyright 2022-2023 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test that a multi-threaded program doing a vfork doesn't miss breakpoints.
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#
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# When a program vforks, its address space is shared with the parent. When we
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# detach a vfork child, we must keep breakpoints out of that shared address space
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# until the child either exits or execs, so that the child does not hit a
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# breakpoint while out of GDB's control. During that time, threads from
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# the parent must be held stopped, otherwise they could miss breakpoints.
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#
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# The thread that did the vfork is suspended by the kernel, so it's not a
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# concern. The other threads need to be manually stopped by GDB and resumed
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# once the vfork critical region is done.
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#
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# This test spawns one thread that calls vfork. Meanwhile, the main thread
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# crosses a breakpoint. A buggy GDB would let the main thread run while
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# breakpoints are removed, so the main thread would miss the breakpoint and run
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# until exit.
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standard_testfile
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if { [build_executable "failed to prepare" ${testfile} ${srcfile} {debug pthreads}] } {
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return
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}
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set any "\[^\r\n\]*"
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# A bunch of util procedures to continue an inferior to an expected point.
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proc continue_to_parent_breakpoint {} {
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gdb_test "continue" \
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"hit Breakpoint .* should_break_here .*" \
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"continue parent to breakpoint"
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}
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proc continue_to_parent_end {} {
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gdb_test "continue" "Inferior 1.*exited with code 06.*" \
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"continue parent to end"
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}
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# Run the test with the given GDB settings.
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proc do_test { target-non-stop non-stop follow-fork-mode detach-on-fork schedule-multiple } {
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save_vars { ::GDBFLAGS } {
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append ::GDBFLAGS " -ex \"maintenance set target-non-stop ${target-non-stop}\""
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append ::GDBFLAGS " -ex \"set non-stop ${non-stop}\""
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clean_restart ${::binfile}
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}
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gdb_test_no_output "set follow-fork-mode ${follow-fork-mode}"
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gdb_test_no_output "set detach-on-fork ${detach-on-fork}"
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gdb_test_no_output "set schedule-multiple ${schedule-multiple}"
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# The message about thread 2 of inferior 1 exiting happens at a somewhat
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# unpredictable moment, it's simpler to silence it than to try to match it.
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gdb_test_no_output "set print thread-events off"
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if { ![runto_main] } {
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return
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}
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# The main thread is expected to hit this breakpoint.
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gdb_test "break should_break_here" "Breakpoint $::decimal at .*"
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continue_to_parent_breakpoint
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continue_to_parent_end
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}
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# We only test with follow-fork-mode=parent and detach-on-fork=on at the
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# moment, but the loops below are written to make it easy to add other values
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# on these axes in the future.
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foreach_with_prefix target-non-stop {auto on off} {
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foreach_with_prefix non-stop {off on} {
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foreach_with_prefix follow-fork-mode {parent} {
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foreach_with_prefix detach-on-fork {on} {
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foreach_with_prefix schedule-multiple {off on} {
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do_test ${target-non-stop} ${non-stop} ${follow-fork-mode} ${detach-on-fork} ${schedule-multiple}
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}
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}
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}
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}
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}
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