forked from Imagelibrary/binutils-gdb
d8b79a1f24
Cygwin debugging does not support follow fork. There is currently no
interface between the debugger and the Cygwin runtime to be able to
intercept forks and execs. Consequently, testcases that try to
exercise fork/exec all FAIL, and several hit long cascading timeouts.
Add a new allow_fork_tests procedure, meant be be used with require,
and sprinkle it throughout testcases that exercise fork.
Note that some tests currently are skipped on targets other than
Linux, with something like:
# Until "set follow-fork-mode" and "catch vfork" are implemented on
# other targets...
#
if {![istarget "*-linux*"]} {
continue
}
However, some BSD ports also support fork debugging nowadays, and the
testcases were never adjusted... That is why the new allow_fork_tests
procedure doesn't look for linux.
With this patch, on Cygwin, I get this:
$ make check TESTS="*/*fork*.exp"
...
=== gdb Summary ===
# of expected passes 6
# of untested testcases 1
# of unsupported tests 31
Change-Id: I0c5e8c574d1f61b28d370c22a0b0b6bc3efaf978
143 lines
4.3 KiB
Plaintext
143 lines
4.3 KiB
Plaintext
# Copyright (C) 2015-2025 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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# This test verifies that threads created by the child fork are
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# properly handled. Specifically, GDB used to have a bug where it
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# would leave child fork threads stuck stopped, even though "info
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# threads" would show them running.
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#
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# See https://sourceware.org/bugzilla/show_bug.cgi?id=18600
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require allow_fork_tests
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# In remote mode, we cannot continue debugging after all
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# inferiors have terminated, and this test requires that.
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if { [target_info exists gdb_protocol]
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&& [target_info gdb_protocol] == "remote" } {
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return
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}
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standard_testfile
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proc do_test { detach-on-fork } {
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global GDBFLAGS
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global srcfile testfile
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global gdb_prompt
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save_vars { GDBFLAGS } {
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set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
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if {[prepare_for_testing "failed to prepare" \
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$testfile $srcfile {debug pthreads}] == -1} {
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return -1
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}
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}
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if {![runto_main]} {
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return 0
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}
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gdb_test_no_output "set detach-on-fork ${detach-on-fork}"
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set test "continue &"
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gdb_test_multiple $test $test {
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-re "$gdb_prompt " {
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pass $test
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}
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}
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# gdbserver had a bug that resulted in reporting the fork child's
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# initial stop to gdb, which gdb does not expect, in turn
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# resulting in a broken session, like:
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#
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# [Thread 31536.31536] #16 stopped. <== BAD
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# [New Thread 31547.31547]
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# [Inferior 10 (process 31536) exited normally]
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# [New Thread 31547.31560]
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#
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# [Thread 31547.31547] #18 stopped. <== BAD
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# Cannot remove breakpoints because program is no longer writable. <== BAD
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# Further execution is probably impossible. <== BAD
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# [Inferior 11 (process 31547) exited normally]
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# [Inferior 1 (process 31454) exited normally]
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#
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# These variables track whether we see such broken behavior.
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set saw_cannot_remove_breakpoints 0
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set saw_thread_stopped 0
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set expected_num_inferior_exits [expr ${detach-on-fork} == "off" ? 11 : 1]
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# Flags indicating if we have see the exit for each inferior.
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for {set i 1} {$i <= $expected_num_inferior_exits} {incr i} {
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set inferior_exits_seen($i) 0
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}
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# Number of inferior exits seen so far.
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set num_inferior_exits_seen 0
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set test "inferior 1 exited"
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gdb_test_multiple "" $test {
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-re "^Cannot remove breakpoints" {
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set saw_cannot_remove_breakpoints 1
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exp_continue
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}
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-re "^\\\[Thread \[^\r\n\]+ stopped\\." {
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set saw_thread_stopped 1
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exp_continue
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}
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-re "^\\\[Inferior ($::decimal) \(\[^\r\n\]+\) exited normally\\\]" {
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set infnum $expect_out(1,string)
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incr num_inferior_exits_seen
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incr inferior_exits_seen($infnum) 1
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if { $num_inferior_exits_seen == $expected_num_inferior_exits } {
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pass $test
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} else {
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exp_continue
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}
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}
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-re "^\[^\r\n]*\r\n" {
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# Skip line.
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exp_continue
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}
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}
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# Verify that we got all the inferior exits we expected.
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set num_ok_exits 0
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for {set i 1} {$i <= $expected_num_inferior_exits} {incr i} {
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if { $inferior_exits_seen($i) == 1 } {
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incr num_ok_exits
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}
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}
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gdb_assert { $num_ok_exits == $expected_num_inferior_exits } \
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"seen all expected inferior exits"
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gdb_assert !$saw_cannot_remove_breakpoints \
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"no failure to remove breakpoints"
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gdb_assert !$saw_thread_stopped \
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"no spurious thread stop"
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gdb_test "info threads" "No threads\." \
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"no threads left"
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gdb_test "info inferiors" \
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"Num\[ \t\]+Description\[ \t\]+Connection\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
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"only inferior 1 left"
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}
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foreach_with_prefix detach-on-fork {"on" "off"} {
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do_test ${detach-on-fork}
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}
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