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1d506c26 | 1 | # Copyright 2021-2024 Free Software Foundation, Inc. |
df5ad102 SM |
2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | # Detach a running program that constantly forks, verify that we correctly | |
17 | # detach all fork children, for which events are pending. | |
18 | # | |
19 | # The strategy is: | |
20 | # | |
21 | # - Resume a program in background (continue &) with many threads that | |
22 | # constantly fork and wait for their fork children to exit. | |
23 | # - Detach the program. If testing against GDBserver, hope that the detach | |
24 | # CLI command is processed while there is a stop reply pending in the | |
25 | # remote target. | |
26 | # - Signal the parent program to exit, by sending it a SIGUSR1 signal. | |
27 | # - Have the parent write a flag file to the filesystem just before exiting. | |
28 | # - If a pending fork child is mistakenly still attached, it will prevent its | |
29 | # parent thread from waitpid'ing it, preventing the main thread from joining | |
30 | # it, prevent it from writing the flag file, failing the test. | |
31 | ||
32 | standard_testfile | |
33 | ||
34 | if { [is_remote target] } { | |
35 | # If the target is remote, write the file in whatever the current working | |
36 | # directory is, with a somewhat unique name. | |
37 | set touch_file_path ${testfile}-flag | |
38 | } else { | |
39 | set touch_file_path [standard_output_file flag] | |
40 | } | |
41 | ||
42 | if { [gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \ | |
43 | executable [list debug "additional_flags=-DTOUCH_FILE_PATH=\"$touch_file_path\""]] != "" } { | |
44 | return | |
45 | } | |
46 | ||
47 | proc do_test { } { | |
48 | remote_file target delete $::touch_file_path | |
49 | gdb_assert { ![remote_file target exists $::touch_file_path] } "file does not exist before test" | |
50 | ||
51 | save_vars { ::GDBFLAGS } { | |
52 | append ::GDBFLAGS " -ex \"set non-stop on\"" | |
53 | clean_restart $::binfile | |
54 | } | |
55 | ||
56 | if { ![runto break_here_first] } { | |
57 | return | |
58 | } | |
59 | ||
60 | set pid [get_integer_valueof "my_pid" -1] | |
61 | if { $pid == -1 } { | |
62 | error "could not get inferior pid" | |
63 | } | |
64 | ||
65 | gdb_test_no_output "set print inferior-events off" | |
66 | ||
67 | gdb_test_multiple "continue &" "" { | |
68 | -re "Continuing.\r\n$::gdb_prompt " { | |
69 | pass $gdb_test_name | |
70 | } | |
71 | } | |
72 | ||
73 | set wait_time_s 2 | |
74 | ||
75 | if { [info exists ::server_spawn_id] } { | |
76 | # Let the program run for 2 seconds, during which it will fork many times. | |
77 | # When running against GDBserver, this makes server print a ton of | |
78 | # "Detaching from process X" message, to the point where its output buffer | |
79 | # gets full and it hangs in a write to stdout. During these 2 seconds, | |
80 | # drain the messages from GDBserver to keep that from happening. | |
81 | gdb_test_multiple "" "flush server output" { | |
82 | -timeout $wait_time_s | |
83 | -i $::server_spawn_id | |
84 | -re ".+" { | |
85 | exp_continue -continue_timer | |
86 | } | |
87 | ||
88 | timeout { | |
89 | pass $gdb_test_name | |
90 | } | |
91 | } | |
92 | } else { | |
93 | # Not using GDBserver, just sleep 2 seconds. | |
94 | sleep $wait_time_s | |
95 | } | |
96 | ||
97 | gdb_test "detach" "Detaching from program: .*" | |
98 | ||
99 | if { [info exists ::server_spawn_id] } { | |
100 | # Drain GDBserver's output buffer, in the (unlikely) event that enough | |
101 | # messages were output to fill the buffer between the moment we stopped | |
102 | # consuming it and the moment GDBserver detached the process. | |
103 | gdb_test_multiple "" "" { | |
104 | -i $::server_spawn_id | |
105 | -re ".+" { | |
106 | exp_continue | |
107 | } | |
108 | -re "^$" {} | |
109 | } | |
110 | } | |
111 | ||
112 | remote_exec target "kill -USR1 ${pid}" | |
113 | gdb_assert { [target_file_exists_with_timeout $::touch_file_path] } "file exists after detach" | |
114 | ||
115 | # Don't leave random files on the target system. | |
116 | if { [is_remote target] } { | |
117 | remote_file target delete $::touch_file_path | |
118 | } | |
119 | } | |
120 | ||
121 | do_test |