1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
|
# Copyright 1997-2016 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/>.
# Various tests of gdb's ability to follow the parent or child of a
# Unix vfork system call. A vfork parent is blocked until the child
# either execs or exits --- since those events take somewhat different
# code paths in GDB, both variants are exercised.
# Until "set follow-fork-mode" and "catch vfork" are implemented on
# other targets...
#
if {![istarget "*-linux*"]} then {
continue
}
standard_testfile
set compile_options debug
if {[build_executable $testfile.exp $testfile $srcfile $compile_options] == -1} {
untested "failed to compile main testcase"
return -1
}
set testfile2 "vforked-prog"
set srcfile2 ${testfile2}.c
if {[build_executable $testfile.exp $testfile2 $srcfile2 $compile_options] == -1} {
untested "failed to compile secondary testcase"
return -1
}
# A few of these tests require a little more time than the standard
# timeout allows.
set oldtimeout $timeout
set timeout [expr "$timeout + 10"]
# Start with a fresh GDB, with verbosity enabled, and run to main. On
# error, behave as "return", so we don't try to continue testing with
# a borked session.
proc setup_gdb {} {
global testfile srcfile
clean_restart $testfile
# The "Detaching..." and "Attaching..." messages may be hidden by
# default.
gdb_test_no_output "set verbose"
if ![runto_main] {
return -code return
}
set tbreak_line [gdb_get_line_number " VFORK " $srcfile]
gdb_test "tbreak ${tbreak_line}"
gdb_continue_to_breakpoint ".*"
}
proc check_vfork_catchpoints {} {
global gdb_prompt
global has_vfork_catchpoints
setup_gdb
# Verify that the system supports "catch vfork".
gdb_test "catch vfork" "Catchpoint \[0-9\]* \\(vfork\\)" "insert first vfork catchpoint"
set has_vfork_catchpoints 0
gdb_test_multiple "continue" "continue to first vfork catchpoint" {
-re ".*Your system does not support this type\r\nof catchpoint.*$gdb_prompt $" {
unsupported "continue to first vfork catchpoint"
}
-re ".*Catchpoint.*$gdb_prompt $" {
set has_vfork_catchpoints 1
pass "continue to first vfork catchpoint"
}
}
if {$has_vfork_catchpoints == 0} {
unsupported "vfork catchpoints"
return -code return
}
}
proc vfork_parent_follow_through_step {} {
with_test_prefix "vfork parent follow, through step" {
global gdb_prompt
setup_gdb
gdb_test_no_output "set follow-fork parent"
set test "step"
gdb_test_multiple "next" $test {
-re "Detaching after vfork from.*if \\(pid == 0\\).*$gdb_prompt " {
pass $test
}
}
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any gdb_expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc vfork_parent_follow_to_bp {} {
with_test_prefix "vfork parent follow, to bp" {
global gdb_prompt
global srcfile
setup_gdb
gdb_test_no_output "set follow-fork parent"
set bp_location [gdb_get_line_number "printf (\"I'm the proud parent of child"]
gdb_test "break ${srcfile}:${bp_location}" ".*" "break, vfork to bp"
set test "continue to bp"
gdb_test_multiple "continue" $test {
-re ".*Detaching after vfork from child process.*Breakpoint.*${bp_location}.*$gdb_prompt " {
pass $test
}
}
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc vfork_child_follow_to_exit {} {
with_test_prefix "vfork child follow, to exit" {
global gdb_prompt
setup_gdb
gdb_test_no_output "set follow-fork child"
set test "continue to child exit"
gdb_test_multiple "continue" $test {
-re "Couldn't get registers.*$gdb_prompt " {
# PR gdb/14766
fail "$test"
}
-re "Attaching after.* vfork to.*Detaching vfork parent .* after child exit.*$gdb_prompt " {
pass $test
}
}
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any gdb_expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc vfork_and_exec_child_follow_to_main_bp {} {
with_test_prefix "vfork and exec child follow, to main bp" {
global gdb_prompt
global srcfile2
setup_gdb
gdb_test_no_output "set follow-fork child"
set linenum [gdb_get_line_number "printf(\"Hello from vforked-prog" ${srcfile2}]
set test "continue to bp"
gdb_test_multiple "continue" $test {
-re "Attaching after.* vfork to.*Detaching vfork parent.*xecuting new program.*Breakpoint.*vforked-prog.c:${linenum}.*$gdb_prompt " {
pass $test
}
}
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any gdb_expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc vfork_and_exec_child_follow_through_step {} {
with_test_prefix "vfork and exec child follow, through step" {
global gdb_prompt
global srcfile2
setup_gdb
gdb_test_no_output "set follow-fork child"
set test "step over vfork"
# The ideal support is to be able to debug the child even
# before it execs. Thus, "next" lands on the next line after
# the vfork.
gdb_test_multiple "next" $test {
-re "Attaching after .* vfork to child.*if \\(pid == 0\\).*$gdb_prompt " {
pass "$test"
}
}
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc continue_to_vfork {} {
global gdb_prompt
# A vfork catchpoint may stop in either "vfork" or "_vfork".
set test "continue to vfork"
gdb_test_multiple "continue" $test {
-re "vfork \\(\\) at .*$gdb_prompt $" {
pass $test
}
-re "0x\[0-9a-fA-F\]*.*(vfork|__kernel_v?syscall).*$gdb_prompt " {
pass $test
}
}
}
proc tcatch_vfork_then_parent_follow {} {
with_test_prefix "vfork parent follow, finish after tcatch vfork" {
global gdb_prompt
global srcfile
setup_gdb
gdb_test_no_output "set follow-fork parent"
gdb_test "tcatch vfork" "Catchpoint .*(vfork).*"
continue_to_vfork
set linenum [gdb_get_line_number "pid = vfork ();"]
set test "finish"
gdb_test_multiple "finish" $test {
-re "Run till exit from.*vfork.*0x\[0-9a-fA-F\]* in main .* at .*${srcfile}:${linenum}.*$gdb_prompt " {
pass $test
}
-re "Run till exit from.*__kernel_v?syscall.*0x\[0-9a-fA-F\]* in vfork .*$gdb_prompt " {
send_gdb "finish\n"
exp_continue
}
}
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc tcatch_vfork_then_child_follow_exec {} {
with_test_prefix "vfork child follow, finish after tcatch vfork" {
global gdb_prompt
global srcfile
global srcfile2
setup_gdb
gdb_test_no_output "set follow-fork child"
gdb_test "tcatch vfork" "Catchpoint .*(vfork).*"
continue_to_vfork
set linenum1 [gdb_get_line_number "pid = vfork ();"]
set linenum2 [gdb_get_line_number "printf(\"Hello from vforked-prog" ${srcfile2}]
set test "finish"
gdb_test_multiple "finish" $test {
-re "Run till exit from.*vfork.*${srcfile}:${linenum1}.*$gdb_prompt " {
pass $test
}
-re "Run till exit from.*__kernel_v?syscall.*0x\[0-9a-fA-F\]* in vfork .*$gdb_prompt " {
send_gdb "finish\n"
exp_continue
}
-re "Run till exit from.*vfork.*${srcfile2}:${linenum2}.*$gdb_prompt " {
pass "$test (followed exec)"
}
}
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc tcatch_vfork_then_child_follow_exit {} {
with_test_prefix "vfork child follow, finish after tcatch vfork" {
global gdb_prompt
global srcfile
setup_gdb
gdb_test_no_output "set follow-fork child"
gdb_test "tcatch vfork" "Catchpoint .*(vfork).*"
continue_to_vfork
set test "finish"
gdb_test_multiple "finish" $test {
-re "Run till exit from.*vfork.*exited normally.*$gdb_prompt " {
setup_kfail "gdb/14762" *-*-*
fail $test
}
-re "Run till exit from.*vfork.*pid = vfork \\(\\).*$gdb_prompt " {
pass $test
}
-re "Run till exit from.*__kernel_v?syscall.*0x\[0-9a-fA-F\]* in vfork .*$gdb_prompt " {
send_gdb "finish\n"
exp_continue
}
}
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}}
proc vfork_relations_in_info_inferiors { variant } {
with_test_prefix "vfork relations in info inferiors" {
global gdb_prompt
setup_gdb
gdb_test_no_output "set follow-fork child"
set test "step over vfork"
gdb_test_multiple "next" $test {
-re "Attaching after .* vfork to child.*if \\(pid == 0\\).*$gdb_prompt " {
pass "$test"
}
}
gdb_test "info inferiors" \
".*is vfork parent of inferior 2.*is vfork child of inferior 1" \
"info inferiors shows vfork parent/child relation"
if { $variant == "exec" } {
global srcfile2
set linenum [gdb_get_line_number "printf(\"Hello from vforked-prog" ${srcfile2}]
set test "continue to bp"
gdb_test_multiple "continue" $test {
-re ".*xecuting new program.*Breakpoint.*vforked-prog.c:${linenum}.*$gdb_prompt " {
pass $test
}
}
} else {
set test "continue to child exit"
gdb_test_multiple "continue" $test {
-re "exited normally.*$gdb_prompt " {
pass $test
}
}
}
set test "vfork relation no longer appears in info inferiors"
gdb_test_multiple "info inferiors" $test {
-re "is vfork child of inferior 1.*$gdb_prompt $" {
fail $test
}
-re "is vfork parent of inferior 2.*$gdb_prompt $" {
fail $test
}
-re "$gdb_prompt $" {
pass $test
}
}
}}
proc do_vfork_and_follow_parent_tests {} {
global gdb_prompt
# Try following the parent process by stepping through a call to
# vfork. Do this without catchpoints.
vfork_parent_follow_through_step
# Try following the parent process by setting a breakpoint on the
# other side of a vfork, and running to that point. Do this
# without catchpoints.
vfork_parent_follow_to_bp
# Try catching a vfork, and stepping out to the parent.
#
tcatch_vfork_then_parent_follow
}
proc do_vfork_and_follow_child_tests_exec {} {
# Try following the child process by just continuing through the
# vfork, and letting the parent's breakpoint on "main" be auto-
# magically reset in the child.
#
vfork_and_exec_child_follow_to_main_bp
# Try following the child process by stepping through a call to
# vfork. The child also executes an exec. Since the child cannot
# be debugged until after it has exec'd, and since there's a bp on
# "main" in the parent, and since the bp's for the parent are
# recomputed in the exec'd child, the step through a vfork should
# land us in the "main" for the exec'd child, too.
#
vfork_and_exec_child_follow_through_step
# Try catching a vfork, and stepping out to the child.
#
tcatch_vfork_then_child_follow_exec
# Test the ability to follow both child and parent of a vfork. Do
# this without catchpoints.
# ??rehrauer: NYI. Will add testpoints here when implemented.
#
# Test the ability to have the debugger ask the user at vfork-time
# whether to follow the parent, child or both. Do this without
# catchpoints.
# ??rehrauer: NYI. Will add testpoints here when implemented.
#
# Step over a vfork in the child, do "info inferiors" and check the
# parent/child relation is displayed. Run the child over the exec,
# and confirm the relation is no longer displayed in "info
# inferiors".
#
vfork_relations_in_info_inferiors "exec"
}
proc do_vfork_and_follow_child_tests_exit {} {
# Try following the child process by just continuing through the
# vfork, and letting the child exit.
#
vfork_child_follow_to_exit
# Try catching a vfork, and stepping out to the child.
#
tcatch_vfork_then_child_follow_exit
# Step over a vfork in the child, do "info inferiors" and check the
# parent/child relation is displayed. Run the child to completion,
# and confirm the relation is no longer displayed in "info
# inferiors".
#
vfork_relations_in_info_inferiors "exit"
}
with_test_prefix "check vfork support" {
# Check that vfork catchpoints are supported, as an indicator for
# whether vfork-following is supported.
check_vfork_catchpoints
}
# Follow parent and follow child vfork tests with a child that execs.
with_test_prefix "exec" {
# These are tests of gdb's ability to follow the parent of a Unix
# vfork system call. The child will subsequently call a variant
# of the Unix exec system call.
do_vfork_and_follow_parent_tests
# These are tests of gdb's ability to follow the child of a Unix
# vfork system call. The child will subsequently call a variant
# of a Unix exec system call.
#
do_vfork_and_follow_child_tests_exec
}
# Switch to test the case of the child exiting. We can't use
# standard_testfile here because we don't want to overwrite the binary
# of the previous tests.
set testfile "foll-vfork-exit"
set srcfile ${testfile}.c
set binfile [standard_output_file ${testfile}]
if {[build_executable $testfile.exp $testfile $srcfile] == -1} {
untested "failed to build $testfile"
return
}
# Follow parent and follow child vfork tests with a child that exits.
with_test_prefix "exit" {
# These are tests of gdb's ability to follow the parent of a Unix
# vfork system call. The child will subsequently exit.
do_vfork_and_follow_parent_tests
# These are tests of gdb's ability to follow the child of a Unix
# vfork system call. The child will subsequently exit.
#
do_vfork_and_follow_child_tests_exit
}
set timeout $oldtimeout
return 0
|