1 # Copyright 1997-2014 Free Software Foundation, Inc.
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.
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.
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/>.
16 if { [is_remote target] || ![isnative] } then {
20 # Until "set follow-fork-mode" and "catch fork" are implemented on
23 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
29 if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
30 untested $testfile.exp
34 proc check_fork_catchpoints {} {
37 # Verify that the system supports "catch fork".
38 gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "insert first fork catchpoint"
39 set has_fork_catchpoints 0
40 gdb_test_multiple "continue" "continue to first fork catchpoint" {
41 -re ".*Your system does not support this type\r\nof catchpoint.*$gdb_prompt $" {
42 unsupported "continue to first fork catchpoint"
44 -re ".*Catchpoint.*$gdb_prompt $" {
45 set has_fork_catchpoints 1
46 pass "continue to first fork catchpoint"
50 if {$has_fork_catchpoints == 0} {
51 unsupported "fork catchpoints"
56 # Test follow-fork to ensure that the correct process is followed, that
57 # the followed process stops where it is expected to stop, that processes
58 # are detached (or not) as expected, and that the inferior list has the
59 # expected contents after following the fork. WHO is the argument to
60 # the 'set follow-fork-mode' command, DETACH is the argument to the
61 # 'set detach-on-fork' command, and CMD is the GDB command used to
62 # execute the program past the fork. If the value of WHO or DETACH is
63 # 'default', the corresponding GDB command is skipped for that test.
64 # The value of CMD must be either 'next 2' or 'continue'.
65 proc test_follow_fork { who detach cmd } {
70 with_test_prefix "follow $who, detach $detach, command \"$cmd\"" {
72 # Start a new debugger session each time so defaults are legitimate.
73 clean_restart $testfile
76 untested "could not run to main"
80 # The "Detaching..." and "Attaching..." messages may be hidden by
82 gdb_test_no_output "set verbose"
84 # Set follow-fork-mode if we aren't using the default.
85 if {$who == "default"} {
88 gdb_test_no_output "set follow-fork $who"
91 gdb_test "show follow-fork" \
92 "Debugger response to a program call of fork or vfork is \"$who\"." \
95 # Set detach-on-fork mode if we aren't using the default.
96 if {$detach == "default"} {
99 gdb_test_no_output "set detach-on-fork $detach"
102 gdb_test "show detach-on-fork" \
103 "Whether gdb will detach.* fork is $detach." \
104 "show detach-on-fork"
106 # Set a breakpoint after the fork if we aren't single-stepping
108 if {$cmd == "continue"} {
109 set bp_after_fork [gdb_get_line_number "set breakpoint here"]
110 gdb_test "break ${srcfile}:$bp_after_fork" \
111 "Breakpoint.*, line $bp_after_fork.*" \
112 "set breakpoint after fork"
115 # Set up the output we expect to see after we run.
117 if {$who == "child"} {
118 set expected_re "Attaching after.* fork to.*set breakpoint here.*"
119 } elseif {$who == "parent" && $detach == "on"} {
120 set expected_re "Detaching after fork from .*set breakpoint here.*"
122 set expected_re ".*set breakpoint here.*"
125 # Test running past and following the fork, using the parameters
127 gdb_test $cmd $expected_re "$cmd past fork"
129 # Check that we have the inferiors arranged correctly after
130 # following the fork.
131 set resume_unfollowed 0
132 if {$who == "parent" && $detach == "on"} {
134 # Follow parent / detach child: the only inferior is the parent.
135 gdb_test "info inferiors" "\\* 1 .* process.*" \
138 } elseif {$who == "parent" && $detach == "off"} {
140 # Follow parent / keep child: two inferiors under debug, the
141 # parent is the current inferior.
142 gdb_test "info inferiors" " 2 .*process.*\\* 1 .*process.*" \
145 gdb_test "inferior 2" "Switching to inferior 2 .*"
146 set resume_unfollowed 1
148 } elseif {$who == "child" && $detach == "on"} {
150 # Follow child / detach parent: the child is under debug and is
151 # the current inferior. The parent is listed but is not under
153 gdb_test "info inferiors" "\\* 2 .*process.* 1 .*<null>.*" \
156 } elseif {$who == "child" && $detach == "off"} {
158 # Follow child / keep parent: two inferiors under debug, the
159 # child is the current inferior.
160 gdb_test "info inferiors" "\\* 2 .*process.* 1 .*process.*" \
163 gdb_test "inferior 1" "Switching to inferior 1 .*"
164 set resume_unfollowed 1
167 if {$resume_unfollowed == 1} {
168 if {$cmd == "next 2"} {
170 gdb_continue_to_end "continue unfollowed inferior to end"
172 } elseif {$cmd == "continue"} {
174 gdb_continue_to_breakpoint \
175 "continue unfollowed inferior to bp" \
176 ".* set breakpoint here.*"
182 proc catch_fork_child_follow {} {
186 set bp_after_fork [gdb_get_line_number "set breakpoint here"]
188 gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
189 "explicit child follow, set catch fork"
191 # Verify that the catchpoint is mentioned in an "info breakpoints",
192 # and further that the catchpoint mentions no process id.
194 set test_name "info shows catchpoint without pid"
195 gdb_test_multiple "info breakpoints" "$test_name" {
196 -re ".*catchpoint.*keep y.*fork\[\r\n\]+$gdb_prompt $" {
201 gdb_test "continue" \
202 "Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
203 "explicit child follow, catch fork"
205 # Verify that the catchpoint is mentioned in an "info breakpoints",
206 # and further that the catchpoint managed to capture a process id.
208 set test_name "info shows catchpoint without pid"
209 gdb_test_multiple "info breakpoints" "$test_name" {
210 -re ".*catchpoint.*keep y.*fork, process.*$gdb_prompt $" {
215 gdb_test_no_output "set follow-fork child"
217 gdb_test "tbreak ${srcfile}:$bp_after_fork" \
218 "Temporary breakpoint.*, line $bp_after_fork.*" \
219 "set follow-fork child, tbreak"
221 gdb_test "continue" \
222 "Attaching after.* fork to.* at .*$bp_after_fork.*" \
223 "set follow-fork child, hit tbreak"
225 # The parent has been detached; allow time for any output it might
226 # generate to arrive, so that output doesn't get confused with
227 # any expected debugger output from a subsequent testpoint.
231 gdb_test "delete breakpoints" \
233 "set follow-fork child, cleanup" \
234 "Delete all breakpoints. \\(y or n\\) $" \
238 proc catch_fork_unpatch_child {} {
242 set bp_exit [gdb_get_line_number "at exit"]
244 gdb_test "break callee" "file .*$srcfile, line .*" \
245 "unpatch child, break at callee"
246 gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
247 "unpatch child, set catch fork"
249 gdb_test "continue" \
250 "Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
251 "unpatch child, catch fork"
253 # Delete all breakpoints and catchpoints.
256 # Force $srcfile as the current GDB source can be in glibc sourcetree.
257 gdb_test "break $srcfile:$bp_exit" \
258 "Breakpoint .*file .*$srcfile, line .*" \
259 "unpatch child, breakpoint at exit call"
261 gdb_test_no_output "set follow-fork child" \
262 "unpatch child, set follow-fork child"
264 set test "unpatch child, unpatched parent breakpoints from child"
265 gdb_test_multiple "continue" $test {
266 -re "at exit.*$gdb_prompt $" {
269 -re "SIGTRAP.*$gdb_prompt $" {
272 # Explicitly kill this child, so we can continue gracefully
273 # with further testing...
276 -re ".*Kill the program being debugged.*y or n. $" {
278 gdb_expect -re "$gdb_prompt $" {}
285 proc tcatch_fork_parent_follow {} {
289 set bp_after_fork [gdb_get_line_number "set breakpoint here"]
291 gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
292 "explicit parent follow, set tcatch fork"
294 # ??rehrauer: I don't yet know how to get the id of the tcatch
295 # via this script, so that I can add a -do list to it. For now,
296 # do the follow stuff after the catch happens.
298 gdb_test "continue" \
299 "Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
300 "explicit parent follow, tcatch fork"
302 gdb_test_no_output "set follow-fork parent"
304 gdb_test "tbreak ${srcfile}:$bp_after_fork" \
305 "Temporary breakpoint.*, line $bp_after_fork.*" \
306 "set follow-fork parent, tbreak"
308 gdb_test "continue" \
309 "Detaching after fork from.* at .*$bp_after_fork.*" \
310 "set follow-fork parent, hit tbreak"
312 # The child has been detached; allow time for any output it might
313 # generate to arrive, so that output doesn't get confused with
314 # any expected debugger output from a subsequent testpoint.
318 gdb_test "delete breakpoints" \
320 "set follow-fork parent, cleanup" \
321 "Delete all breakpoints. \\(y or n\\) $" \
325 proc do_fork_tests {} {
329 # Verify that help is available for "set follow-fork-mode".
331 gdb_test "help set follow-fork-mode" \
332 "Set debugger response to a program call of fork or vfork..*
333 A fork or vfork creates a new process. follow-fork-mode can be:.*
334 .*parent - the original process is debugged after a fork.*
335 .*child - the new process is debugged after a fork.*
336 The unfollowed process will continue to run..*
337 By default, the debugger will follow the parent process..*" \
338 "help set follow-fork"
340 # Verify that we can set follow-fork-mode, using an abbreviation
341 # for both the flag and its value.
343 gdb_test_no_output "set follow-fork ch"
345 gdb_test "show follow-fork" \
346 "Debugger response to a program call of fork or vfork is \"child\".*" \
347 "set follow-fork, using abbreviations"
349 # Verify that we cannot set follow-fork-mode to nonsense.
351 gdb_test "set follow-fork chork" "Undefined item: \"chork\".*" \
352 "set follow-fork to nonsense is prohibited"
354 gdb_test_no_output "set follow-fork parent" "reset parent"
356 # Check that fork catchpoints are supported, as an indicator for whether
357 # fork-following is supported.
358 if [runto_main] then { check_fork_catchpoints }
360 # Test the basic follow-fork functionality using all combinations of
361 # values for follow-fork-mode and detach-on-fork, using either a
362 # breakpoint or single-step to execute past the fork.
364 # The first loop should be sufficient to test the defaults. There
365 # is no need to test using the defaults in other permutations (e.g.
366 # "default" "on", "parent" "default", etc.).
367 foreach cmd {"next 2" "continue"} {
368 test_follow_fork "default" "default" $cmd
371 # Now test all explicit permutations.
372 foreach who {"parent" "child"} {
373 foreach detach {"on" "off"} {
374 foreach cmd {"next 2" "continue"} {
375 test_follow_fork $who $detach $cmd
382 # Restart to eliminate any effects of the follow-fork tests.
383 clean_restart $testfile
384 gdb_test_no_output "set verbose"
386 # Test the ability to catch a fork, specify that the child be
387 # followed, and continue. Make the catchpoint permanent.
389 if [runto_main] then { catch_fork_child_follow }
391 # Test that parent breakpoints are successfully detached from the
392 # child at fork time, even if the user removes them from the
393 # breakpoints list after stopping at a fork catchpoint.
394 if [runto_main] then { catch_fork_unpatch_child }
396 # Test the ability to catch a fork, specify via a -do clause that
397 # the parent be followed, and continue. Make the catchpoint temporary.
399 if [runto_main] then { tcatch_fork_parent_follow }
402 # The "Detaching..." and "Attaching..." messages may be hidden by
404 gdb_test_no_output "set verbose"
406 # This is a test of gdb's ability to follow the parent, child or both
407 # parent and child of a Unix fork() system call.