| # Copyright 2016 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 spawns a few threads that immediately exit the whole |
| # process. On targets where the debugger needs to detach from each |
| # thread individually (such as on the Linux kernel), the debugger must |
| # handle the case of the process exiting while the detach is ongoing. |
| # |
| # Similarly, the process can also be killed from outside the debugger |
| # (e.g., with SIGKILL), _before_ the user requests a detach. The |
| # debugger must likewise detach gracefully. |
| # |
| # The testcase actually builds two variants of the test program: |
| # single-process, and multi-process. In the multi-process variant, |
| # the test program forks, and it's the fork child that spawns threads |
| # that exit just while the process is being detached from. The fork |
| # parent waits for its child to exit, so if GDB fails to detach from |
| # the child correctly, the parent hangs. Because continuing the |
| # parent can mask failure to detach from the child correctly (e.g., |
| # due to waitpid(-1,...) calls deep in the target layers managing to |
| # reap the child), we try immediately detaching from the parent too, |
| # and observing whether the parent exits via standard output. |
| # |
| # Normally, if testing with "target remote" against gdbserver, then |
| # after detaching from all attached processes, gdbserver exits. |
| # However, when gdbserver detaches from a process that is its own |
| # direct child, gdbserver does not exit immediately. Instead it |
| # "joins" (waits for) the child, only exiting when the child itself |
| # exits too. Thus, on Linux, if gdbserver fails to detach from the |
| # zombie child's threads correctly (or rather, reap them), it'll hang, |
| # because the leader thread will only return an exit status after all |
| # threads are reaped. We test that as well. |
| |
| standard_testfile |
| |
| # Test that GDBserver exits. |
| |
| proc test_server_exit {} { |
| global server_spawn_id |
| |
| set test "server exits" |
| gdb_expect { |
| -i $server_spawn_id |
| eof { |
| pass $test |
| wait -i $server_spawn_id |
| unset server_spawn_id |
| } |
| timeout { |
| fail "$test (timeout)" |
| } |
| } |
| } |
| |
| # If RESULT is not zero, make the caller return. |
| |
| proc return_if_fail { result } { |
| if {$result != 0} { |
| return -code return |
| } |
| } |
| |
| # Detach from a process, and ensure that it exits after detaching. |
| # This relies on inferior I/O. |
| |
| proc detach_and_expect_exit {test} { |
| global decimal |
| global gdb_spawn_id |
| global inferior_spawn_id |
| global gdb_prompt |
| |
| return_if_fail [gdb_test_multiple "detach" $test { |
| -re "Detaching from .*, process $decimal" { |
| } |
| }] |
| |
| set saw_prompt 0 |
| set saw_inf_exit 0 |
| while { !$saw_prompt && ! $saw_inf_exit } { |
| # We don't know what order the interesting things will arrive in. |
| # Using a pattern of the form 'x|y|z' instead of -re x ... -re y |
| # ... -re z ensures that expect always chooses the match that |
| # occurs leftmost in the input, and not the pattern appearing |
| # first in the script that occurs anywhere in the input, so that |
| # we don't skip anything. |
| return_if_fail [gdb_test_multiple "" $test { |
| -i "$inferior_spawn_id $gdb_spawn_id" |
| -re "(exited, status=0)|($gdb_prompt )" { |
| if {[info exists expect_out(1,string)]} { |
| verbose -log "saw inferior exit" |
| set saw_inf_exit 1 |
| } elseif {[info exists expect_out(2,string)]} { |
| verbose -log "saw prompt" |
| set saw_prompt 1 |
| } |
| array unset expect_out |
| } |
| }] |
| } |
| |
| pass $test |
| } |
| |
| # Run to _exit in the child. |
| |
| proc continue_to_exit_bp {} { |
| gdb_breakpoint "_exit" temporary |
| gdb_continue_to_breakpoint "_exit" ".*_exit.*" |
| } |
| |
| # If testing single-process, simply detach from the process. |
| # |
| # If testing multi-process, first detach from the child, then detach |
| # from the parent and confirm that the parent exits, thus ensuring |
| # we've detached from the child successfully, as the parent hangs in |
| # its waitpid call otherwise. |
| # |
| # If connected with "target remote", make sure gdbserver exits. |
| # |
| # CMD indicates what to do with the parent after detaching the child. |
| # Can be either "detach" to detach, or "continue", to continue to |
| # exit. If "continue", then CONTINUE_RE is the regexp to expect. |
| # Defaults to normal exit output. |
| # |
| proc do_detach {multi_process cmd {continue_re ""}} { |
| global decimal |
| global server_spawn_id |
| |
| if {$continue_re == ""} { |
| set continue_re "exited normally.*" |
| } |
| |
| set is_remote [expr {[target_info exists gdb_protocol] |
| && [target_info gdb_protocol] == "remote"}] |
| |
| if {$multi_process} { |
| gdb_test "detach" "Detaching from .*, process $decimal" \ |
| "detach child" |
| |
| gdb_test "inferior 1" "\[Switching to inferior $decimal\].*" \ |
| "switch to parent" |
| |
| if {$cmd == "detach"} { |
| # Make sure that detach works and that the parent process |
| # exits cleanly. |
| detach_and_expect_exit "detach parent" |
| } elseif {$cmd == "continue"} { |
| # Make sure that continuing works and that the parent process |
| # exits cleanly. |
| gdb_test "continue" $continue_re |
| } else { |
| perror "unhandled command: $cmd" |
| } |
| } else { |
| if $is_remote { |
| set extra "\r\nEnding remote debugging\." |
| } else { |
| set extra "" |
| } |
| if {$cmd == "detach"} { |
| gdb_test "detach" "Detaching from .*, process $decimal$extra" |
| } elseif {$cmd == "continue"} { |
| gdb_test "continue" $continue_re |
| } else { |
| perror "unhandled command: $cmd" |
| } |
| } |
| |
| # When connected in "target remote" mode, the server should exit |
| # when there are no processes left to debug. |
| if { $is_remote && [info exists server_spawn_id]} { |
| test_server_exit |
| } |
| } |
| |
| # Test detaching from a process that dies just while GDB is detaching. |
| |
| proc test_detach {multi_process cmd} { |
| with_test_prefix "detach" { |
| global binfile |
| |
| clean_restart ${binfile} |
| |
| if ![runto_main] { |
| fail "Can't run to main" |
| return -1 |
| } |
| |
| if {$multi_process} { |
| gdb_test_no_output "set detach-on-fork off" |
| gdb_test_no_output "set follow-fork-mode child" |
| } |
| |
| # Run to _exit in the child. |
| continue_to_exit_bp |
| |
| do_detach $multi_process $cmd |
| } |
| } |
| |
| # Same as test_detach, except set a watchpoint before detaching. |
| |
| proc test_detach_watch {multi_process cmd} { |
| with_test_prefix "watchpoint" { |
| global binfile decimal |
| |
| clean_restart ${binfile} |
| |
| if ![runto_main] { |
| fail "Can't run to main" |
| return -1 |
| } |
| |
| if {$multi_process} { |
| gdb_test_no_output "set detach-on-fork off" |
| gdb_test_no_output "set follow-fork-mode child" |
| |
| gdb_breakpoint "child_function" temporary |
| gdb_continue_to_breakpoint "child_function" ".*" |
| } |
| |
| # Set a watchpoint in the child. |
| gdb_test "watch globalvar" ".* watchpoint $decimal: globalvar" |
| |
| # Continue to the _exit breakpoint. This arms the watchpoint |
| # registers in all threads. Detaching will thus need to clear |
| # them out, and handle the case of the thread disappearing |
| # while doing that (on targets that need to detach from each |
| # thread individually). |
| continue_to_exit_bp |
| |
| do_detach $multi_process $cmd |
| } |
| } |
| |
| # Test detaching from a process that dies _before_ GDB starts |
| # detaching. |
| |
| proc test_detach_killed_outside {multi_process cmd} { |
| with_test_prefix "killed outside" { |
| global binfile |
| |
| clean_restart ${binfile} |
| |
| if ![runto_main] { |
| fail "Can't run to main" |
| return -1 |
| } |
| |
| gdb_test_no_output "set breakpoint always-inserted on" |
| |
| if {$multi_process} { |
| gdb_test_no_output "set detach-on-fork off" |
| gdb_test_no_output "set follow-fork-mode child" |
| } |
| |
| # Run to _exit in the child. |
| continue_to_exit_bp |
| |
| set childpid [get_integer_valueof "mypid" -1] |
| if { $childpid == -1 } { |
| untested "failed to extract child pid" |
| return -1 |
| } |
| |
| remote_exec target "kill -9 ${childpid}" |
| |
| # Give it some time to die. |
| sleep 2 |
| |
| if {$multi_process} { |
| set continue_re "exited with code 02.*" |
| } else { |
| set continue_re "terminated with signal SIGKILL.*" |
| } |
| do_detach $multi_process $cmd $continue_re |
| } |
| } |
| |
| # The test proper. MULTI_PROCESS is true if testing the multi-process |
| # variant. |
| |
| proc do_test {multi_process cmd} { |
| global testfile srcfile binfile |
| |
| if {$multi_process && $cmd == "detach" |
| && [target_info exists gdb,noinferiorio]} { |
| # This requires inferior I/O to tell whether both the parent |
| # and child exit successfully. |
| return |
| } |
| |
| set binfile [standard_output_file ${testfile}-$multi_process-$cmd] |
| set options {debug pthreads} |
| if {$multi_process} { |
| lappend options "additional_flags=-DMULTIPROCESS" |
| } |
| |
| if {[build_executable "failed to build" \ |
| $testfile-$multi_process-$cmd $srcfile $options] == -1} { |
| return -1 |
| } |
| |
| test_detach $multi_process $cmd |
| test_detach_watch $multi_process $cmd |
| test_detach_killed_outside $multi_process $cmd |
| } |
| |
| foreach multi_process {0 1} { |
| set mode [expr {$multi_process ? "multi-process" : "single-process"}] |
| foreach cmd {"detach" "continue"} { |
| with_test_prefix "$mode: $cmd" { |
| do_test $multi_process $cmd |
| } |
| } |
| } |