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# Copyright (C) 2015-2023 Free Software Foundation, Inc.
# 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/>.
# This test verifies that threads created by the child fork are
# properly handled. Specifically, GDB used to have a bug where it
# would leave child fork threads stuck stopped, even though "info
# threads" would show them running.
#
# See https://sourceware.org/bugzilla/show_bug.cgi?id=18600
# In remote mode, we cannot continue debugging after all
# inferiors have terminated, and this test requires that.
if { [target_info exists gdb_protocol]
&& [target_info gdb_protocol] == "remote" } {
return
}
standard_testfile
proc do_test { detach-on-fork } {
global GDBFLAGS
global srcfile testfile
global gdb_prompt
set saved_gdbflags $GDBFLAGS
set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
if {[prepare_for_testing "failed to prepare" \
$testfile $srcfile {debug pthreads}] == -1} {
set GDBFLAGS $saved_gdbflags
return -1
}
set GDBFLAGS $saved_gdbflags
if {![runto_main]} {
return 0
}
gdb_test_no_output "set detach-on-fork ${detach-on-fork}"
set test "continue &"
gdb_test_multiple $test $test {
-re "$gdb_prompt " {
pass $test
}
}
# gdbserver had a bug that resulted in reporting the fork child's
# initial stop to gdb, which gdb does not expect, in turn
# resulting in a broken session, like:
#
# [Thread 31536.31536] #16 stopped. <== BAD
# [New Thread 31547.31547]
# [Inferior 10 (process 31536) exited normally]
# [New Thread 31547.31560]
#
# [Thread 31547.31547] #18 stopped. <== BAD
# Cannot remove breakpoints because program is no longer writable. <== BAD
# Further execution is probably impossible. <== BAD
# [Inferior 11 (process 31547) exited normally]
# [Inferior 1 (process 31454) exited normally]
#
# These variables track whether we see such broken behavior.
set saw_cannot_remove_breakpoints 0
set saw_thread_stopped 0
set expected_num_inferior_exits [expr ${detach-on-fork} == "off" ? 11 : 1]
# Flags indicating if we have see the exit for each inferior.
for {set i 1} {$i <= $expected_num_inferior_exits} {incr i} {
set inferior_exits_seen($i) 0
}
# Number of inferior exits seen so far.
set num_inferior_exits_seen 0
set test "inferior 1 exited"
gdb_test_multiple "" $test {
-re "^Cannot remove breakpoints" {
set saw_cannot_remove_breakpoints 1
exp_continue
}
-re "^\\\[Thread \[^\r\n\]+ stopped\\." {
set saw_thread_stopped 1
exp_continue
}
-re "^\\\[Inferior ($::decimal) \(\[^\r\n\]+\) exited normally\\\]" {
set infnum $expect_out(1,string)
incr num_inferior_exits_seen
incr inferior_exits_seen($infnum) 1
if { $num_inferior_exits_seen == $expected_num_inferior_exits } {
pass $test
} else {
exp_continue
}
}
-re "^\[^\r\n]*\r\n" {
# Skip line.
exp_continue
}
}
# Verify that we got all the inferior exits we expected.
set num_ok_exits 0
for {set i 1} {$i <= $expected_num_inferior_exits} {incr i} {
if { $inferior_exits_seen($i) == 1 } {
incr num_ok_exits
}
}
gdb_assert { $num_ok_exits == $expected_num_inferior_exits } \
"seen all expected inferior exits"
gdb_assert !$saw_cannot_remove_breakpoints \
"no failure to remove breakpoints"
gdb_assert !$saw_thread_stopped \
"no spurious thread stop"
gdb_test "info threads" "No threads\." \
"no threads left"
gdb_test "info inferiors" \
"Num\[ \t\]+Description\[ \t\]+Connection\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
"only inferior 1 left"
}
foreach_with_prefix detach-on-fork {"on" "off"} {
do_test ${detach-on-fork}
}
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