gdb/testsuite/gdb.base/attach.exp

   1 # Copyright 1997-2020 Free Software Foundation, Inc.
   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 if {![can_spawn_for_attach]} {
  17     return 0
  18 }
  19
  20 standard_testfile attach.c attach2.c
  21 set binfile2 ${binfile}2
  22 set escapedbinfile  [string_to_regexp $binfile]
  23
  24 #execute_anywhere "rm -f ${binfile} ${binfile2}"
  25 remote_exec build "rm -f ${binfile} ${binfile2}"
  26 # For debugging this test
  27 #
  28 #log_user 1
  29
  30 # build the first test case
  31 #
  32 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  33     untested "failed to compile"
  34     return -1
  35 }
  36
  37 # Build the in-system-call test
  38
  39 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile2}" "${binfile2}" executable {debug}] != "" } {
  40     untested "failed to compile in-system-call test"
  41     return -1
  42 }
  43
  44 if [get_compiler_info] {
  45     return -1
  46 }
  47
  48 # This is a test of the error cases for gdb's ability to attach to a
  49 # running process.
  50
  51 proc_with_prefix do_attach_failure_tests {} {
  52     global gdb_prompt
  53     global binfile
  54     global escapedbinfile
  55     global srcfile
  56
  57     clean_restart $binfile
  58
  59     # Figure out a regular expression that will match the sysroot,
  60     # noting that the default sysroot is "target:", and also noting
  61     # that GDB will strip "target:" from the start of filenames when
  62     # operating on the local filesystem.  However the default sysroot
  63     # can be set via configure option --with-sysroot, which can be "/".
  64     # If $binfile is a absolute path, so pattern
  65     # "$sysroot$escapedbinfile" below is wrong.  Use [^\r\n]* to make
  66     # $sysroot simple.
  67     set sysroot "\[^\r\n\]*"
  68
  69     # Start the program running and then wait for a bit, to be sure
  70     # that it can be attached to.
  71
  72     set test_spawn_id [spawn_wait_for_attach $binfile]
  73     set testpid [spawn_id_get_pid $test_spawn_id]
  74
  75     # Verify that we cannot attach to nonsense.
  76
  77     set test "attach to nonsense is prohibited"
  78     gdb_test_multiple "attach abc" "$test" {
  79         -re "Illegal process-id: abc\\.\r\n$gdb_prompt $" {
  80             pass "$test"
  81         }
  82         -re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
  83             # Response expected from /proc-based systems.
  84             pass "$test"
  85         }
  86         -re "Can't attach to process..*$gdb_prompt $" {
  87             # Response expected on Cygwin
  88             pass "$test"
  89         }
  90         -re "Attaching to.*$gdb_prompt $" {
  91             fail "$test (bogus pid allowed)"
  92         }
  93     }
  94
  95     # Verify that we cannot attach to nonsense even if its initial part is
  96     # a valid PID.
  97
  98     set test "attach to digits-starting nonsense is prohibited"
  99     gdb_test_multiple "attach ${testpid}x" "$test" {
 100         -re "Illegal process-id: ${testpid}x\\.\r\n$gdb_prompt $" {
 101             pass "$test"
 102         }
 103         -re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
 104             # Response expected from /proc-based systems.
 105             pass "$test"
 106         }
 107         -re "Can't attach to process..*$gdb_prompt $" {
 108             # Response expected on Cygwin
 109             pass "$test"
 110         }
 111         -re "Attaching to.*$gdb_prompt $" {
 112             fail "$test (bogus pid allowed)"
 113         }
 114     }
 115
 116     # Verify that we cannot attach to what appears to be a valid
 117     # process ID, but is a process that doesn't exist.  Traditionally,
 118     # most systems didn't have a process with ID 0, so we take that as
 119     # the default.  However, there are a few exceptions.
 120
 121     set boguspid 0
 122     if { [istarget "*-*-*bsd*"] } {
 123         # In FreeBSD 5.0, PID 0 is used for "swapper".  Use -1 instead
 124         # (which should have the desired effect on any version of
 125         # FreeBSD, and probably other *BSD's too).
 126         set boguspid -1
 127     }
 128     set test "attach to nonexistent process is prohibited"
 129     gdb_test_multiple "attach $boguspid" "$test" {
 130         -re "Attaching to.*, process $boguspid.*No such process.*$gdb_prompt $" {
 131             # Response expected on ptrace-based systems (i.e. HP-UX 10.20).
 132             pass "$test"
 133         }
 134         -re "Attaching to.*, process $boguspid failed.*Hint.*$gdb_prompt $" {
 135             # Response expected on ttrace-based systems (i.e. HP-UX 11.0).
 136             pass "$test"
 137         }
 138         -re "Attaching to.*, process $boguspid.*denied.*$gdb_prompt $" {
 139             pass "$test"
 140         }
 141         -re "Attaching to.*, process $boguspid.*not permitted.*$gdb_prompt $" {
 142             pass "$test"
 143         }
 144         -re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
 145             # Response expected from /proc-based systems.
 146             pass "$test"
 147         }
 148         -re "Can't attach to process..*$gdb_prompt $" {
 149             # Response expected on Cygwin
 150             pass "$test"
 151         }
 152         -re "Attaching to.*, process $boguspid.*failed.*$gdb_prompt $" {
 153             # Response expected on the extended-remote target.
 154             pass "$test"
 155         }
 156     }
 157
 158     # Verify that we can't double attach to the process.
 159
 160     set test "first attach"
 161     gdb_test_multiple "attach $testpid" "$test" {
 162         -re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*main.*at .*$srcfile:.*$gdb_prompt $" {
 163             pass "$test"
 164         }
 165         -re "Attaching to program.*`?$escapedbinfile\.exe'?, process $testpid.*\[Switching to thread $testpid\..*\].*$gdb_prompt $" {
 166             # Response expected on Cygwin.
 167             pass "$test"
 168         }
 169     }
 170
 171     gdb_test "add-inferior" "Added inferior 2.*" "add empty inferior 2"
 172     gdb_test "inferior 2" "Switching to inferior 2.*" "switch to inferior 2"
 173
 174     set test "fail to attach again"
 175     gdb_test_multiple "attach $testpid" "$test" {
 176         -re "Attaching to process $testpid.*warning: process .* is already traced by process .*$gdb_prompt $" {
 177             pass "$test"
 178         }
 179         -re "Attaching to process .* failed.*$gdb_prompt $" {
 180             # Response expected when using gdbserver.
 181             pass "$test"
 182         }
 183     }
 184
 185     gdb_test "inferior 1" "Switching to inferior 1.*" "switch to inferior 1"
 186     set test "exit after attach failures"
 187     gdb_test "kill" \
 188         "" \
 189         "$test" \
 190         "Kill the program being debugged.*y or n. $" \
 191         "y"
 192
 193     # Another "don't leave a process around"
 194     kill_wait_spawned_process $test_spawn_id
 195 }
 196
 197 # This is a test of gdb's ability to attach to a running process.
 198
 199 proc_with_prefix do_attach_tests {} {
 200     global gdb_prompt
 201     global binfile
 202     global escapedbinfile
 203     global srcfile
 204     global timeout
 205     global decimal
 206
 207     clean_restart $binfile
 208
 209     # Figure out a regular expression that will match the sysroot,
 210     # noting that the default sysroot is "target:", and also noting
 211     # that GDB will strip "target:" from the start of filenames when
 212     # operating on the local filesystem.  However the default sysroot
 213     # can be set via configure option --with-sysroot, which can be "/".
 214     # If $binfile is a absolute path, so pattern
 215     # "$sysroot$escapedbinfile" below is wrong.  Use [^\r\n]* to make
 216     # $sysroot simple.
 217     set sysroot "\[^\r\n\]*"
 218
 219     # Start the program running and then wait for a bit, to be sure
 220     # that it can be attached to.
 221
 222     set test_spawn_id [spawn_wait_for_attach $binfile]
 223     set testpid [spawn_id_get_pid $test_spawn_id]
 224
 225     # Verify that we can attach to the process by first giving its
 226     # executable name via the file command, and using attach with the
 227     # process ID.
 228
 229     # (Actually, the test system appears to do this automatically for
 230     # us.  So, we must also be prepared to be asked if we want to
 231     # discard an existing set of symbols.)
 232
 233     set test "set file, before attach1"
 234     gdb_test_multiple "file $binfile" "$test" {
 235         -re "Load new symbol table from.*y or n. $" {
 236             gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*" \
 237                 "$test (re-read)"
 238         }
 239         -re "Reading symbols from $escapedbinfile\.\.\.*$gdb_prompt $" {
 240             pass "$test"
 241         }
 242     }
 243
 244     set test "attach1, after setting file"
 245     gdb_test_multiple "attach $testpid" "$test" {
 246         -re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*main.*at .*$srcfile:.*$gdb_prompt $" {
 247             pass "$test"
 248         }
 249         -re "Attaching to program.*`?$escapedbinfile\.exe'?, process $testpid.*\[Switching to thread $testpid\..*\].*$gdb_prompt $" {
 250             # Response expected on Cygwin
 251             pass "$test"
 252         }
 253     }
 254
 255     # Verify that we can "see" the variable "should_exit" in the
 256     # program, and that it is zero.
 257
 258     gdb_test "print should_exit" " = 0" "after attach1, print should_exit"
 259
 260     # Detach the process.
 261
 262     gdb_test "detach" \
 263         "Detaching from program: .*$escapedbinfile, process $testpid\r\n\\\[Inferior $decimal \\(.*\\) detached\\\]" \
 264         "attach1 detach"
 265
 266     # Wait a bit for gdb to finish detaching
 267
 268     exec sleep 5
 269
 270     # Purge the symbols from gdb's brain.  (We want to be certain the
 271     # next attach, which won't be preceded by a "file" command, is
 272     # really getting the executable file without our help.)
 273
 274     set old_timeout $timeout
 275     set timeout 15
 276     set test "attach1, purging symbols after detach"
 277     gdb_test_multiple "file" "$test" {
 278         -re "No executable file now.*Discard symbol table.*y or n. $" {
 279             gdb_test "y" "No symbol file now." "$test"
 280         }
 281     }
 282     set timeout $old_timeout
 283
 284     # Verify that we can attach to the process just by giving the
 285     # process ID.
 286
 287     set test "attach2, with no file"
 288     set found_exec_file 0
 289     gdb_test_multiple "attach $testpid" "$test" {
 290         -re "Attaching to process $testpid.*Load new symbol table from \"$sysroot$escapedbinfile\.exe\".*y or n. $" {
 291             # On Cygwin, the DLL's symbol tables are loaded prior to the
 292             # executable's symbol table.  This in turn always results in
 293             # asking the user for actually loading the symbol table of the
 294             # executable.
 295             gdb_test "y" "Reading symbols from $sysroot$escapedbinfile\.\.\.*" \
 296                 "$test (reset file)"
 297
 298             set found_exec_file 1
 299         }
 300         -re "Attaching to process $testpid.*Reading symbols from $sysroot$escapedbinfile.*main.*at .*$gdb_prompt $" {
 301             pass "$test"
 302             set found_exec_file 1
 303         }
 304     }
 305
 306     if {$found_exec_file == 0} {
 307         set test "load file manually, after attach2"
 308         gdb_test_multiple "file $binfile" "$test" {
 309             -re "A program is being debugged already..*Are you sure you want to change the file.*y or n. $" {
 310                 gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*" \
 311                     "$test (re-read)"
 312             }
 313             -re "Reading symbols from $escapedbinfile\.\.\.*$gdb_prompt $" {
 314                 pass "$test"
 315             }
 316         }
 317     }
 318
 319     # Verify that we can modify the variable "should_exit" in the
 320     # program.
 321
 322     gdb_test_no_output "set should_exit=1" "after attach2, set should_exit"
 323
 324     # Verify that the modification really happened.
 325
 326     gdb_breakpoint [gdb_get_line_number "postloop"] temporary
 327     gdb_continue_to_breakpoint "postloop" ".* postloop .*"
 328
 329     # Allow the test process to exit, to cleanup after ourselves.
 330
 331     gdb_continue_to_end "after attach2, exit"
 332
 333     # Make sure we don't leave a process around to confuse
 334     # the next test run (and prevent the compile by keeping
 335     # the text file busy), in case the "set should_exit" didn't
 336     # work.
 337
 338     kill_wait_spawned_process $test_spawn_id
 339
 340     set test_spawn_id [spawn_wait_for_attach $binfile]
 341     set testpid [spawn_id_get_pid $test_spawn_id]
 342
 343     # Verify that we can attach to the process, and find its a.out
 344     # when we're cd'd to some directory that doesn't contain the
 345     # a.out.  (We use the source path set by the "dir" command.)
 346
 347     gdb_test "dir [standard_output_file {}]" "Source directories searched: .*" \
 348         "set source path"
 349
 350     gdb_test "cd /tmp" "Working directory /tmp." \
 351         "cd away from process working directory"
 352
 353     # Explicitly flush out any knowledge of the previous attachment.
 354
 355     set test "before attach3, flush symbols"
 356     gdb_test_multiple "symbol-file" "$test" {
 357         -re "Discard symbol table from.*y or n. $" {
 358             gdb_test "y" "No symbol file now." \
 359                 "$test"
 360         }
 361         -re "No symbol file now.*$gdb_prompt $" {
 362             pass "$test"
 363         }
 364     }
 365
 366     gdb_test "exec" "No executable file now." \
 367         "before attach3, flush exec"
 368
 369     gdb_test "attach $testpid" \
 370         "Attaching to process $testpid.*Reading symbols from $sysroot$escapedbinfile.*main.*at .*" \
 371         "attach when process' a.out not in cwd"
 372
 373     set test "after attach3, exit"
 374     gdb_test "kill" \
 375         "" \
 376         "$test" \
 377         "Kill the program being debugged.*y or n. $" \
 378         "y"
 379
 380     # Another "don't leave a process around"
 381     kill_wait_spawned_process $test_spawn_id
 382 }
 383
 384 # Test attaching when the target is inside a system call.
 385
 386 proc_with_prefix do_call_attach_tests {} {
 387     global gdb_prompt
 388     global binfile2
 389
 390     clean_restart
 391
 392     set test_spawn_id [spawn_wait_for_attach $binfile2]
 393     set testpid [spawn_id_get_pid $test_spawn_id]
 394
 395     # Attach
 396
 397     gdb_test "file $binfile2" ".*" "load file"
 398     set test "attach call"
 399     gdb_test_multiple "attach $testpid" "$test" {
 400         -re "warning: reading register.*I.*O error.*$gdb_prompt $" {
 401             fail "$test (read register error)"
 402         }
 403         -re "Attaching to.*process $testpid.*libc.*$gdb_prompt $" {
 404             pass "$test"
 405         }
 406         -re "Attaching to.*process $testpid.*\[Switching to thread $testpid\..*\].*$gdb_prompt $" {
 407             pass "$test"
 408         }
 409     }
 410
 411     # See if other registers are problems
 412
 413     set test "info other register"
 414     gdb_test_multiple "i r r3" "$test" {
 415         -re "warning: reading register.*$gdb_prompt $" {
 416             fail "$test"
 417         }
 418         -re "r3.*$gdb_prompt $" {
 419             pass "$test"
 420         }
 421     }
 422
 423     # Get rid of the process
 424
 425     gdb_test "p should_exit = 1"
 426     gdb_continue_to_end
 427
 428     # Be paranoid
 429
 430     kill_wait_spawned_process $test_spawn_id
 431 }
 432
 433 proc_with_prefix do_command_attach_tests {} {
 434     global gdb_prompt
 435     global binfile
 436
 437     if ![isnative] then {
 438         unsupported "command attach test"
 439         return 0
 440     }
 441
 442     set test_spawn_id [spawn_wait_for_attach $binfile]
 443     set testpid [spawn_id_get_pid $test_spawn_id]
 444
 445     gdb_exit
 446
 447     set res [gdb_spawn_with_cmdline_opts \
 448                  "-quiet -iex \"set height 0\" -iex \"set width 0\" --pid=$testpid"]
 449     set test "starting with --pid"
 450     gdb_test_multiple "" $test {
 451         -re "Reading symbols from.*$gdb_prompt $" {
 452             pass "$test"
 453         }
 454     }
 455
 456     # Get rid of the process
 457     kill_wait_spawned_process $test_spawn_id
 458 }
 459
 460 # Test ' gdb --pid PID -ex "run" '.  GDB used to have a bug where
 461 # "run" would run before the attach finished - PR17347.
 462
 463 proc test_command_line_attach_run {} {
 464     global gdb_prompt
 465     global binfile
 466
 467     # Skip test if we cannot attach on the command line and use the run command.
 468     # ??? Unclear what condition to use to return here when using gdbserver.
 469     # ??? None of the below works.
 470     #    ![isnative] || [target_is_gdbserver]
 471     #    ![isnative] || [use_gdb_stub]
 472     if { ![isnative] || [is_remote target] } then {
 473         unsupported "commandline attach run test"
 474         return 0
 475     }
 476
 477     with_test_prefix "cmdline attach run" {
 478         set test_spawn_id [spawn_wait_for_attach $binfile]
 479         set testpid [spawn_id_get_pid $test_spawn_id]
 480
 481         set test "run to prompt"
 482         gdb_exit
 483
 484         set res [gdb_spawn_with_cmdline_opts \
 485                      "-quiet -iex \"set height 0\" -iex \"set width 0\" --pid=$testpid -ex \"start\""]
 486         if { $res != 0} {
 487             fail $test
 488             kill_wait_spawned_process $test_spawn_id
 489             return $res
 490         }
 491         gdb_test_multiple "" $test {
 492             -re {Attaching to.*Start it from the beginning\? \(y or n\) } {
 493                 pass $test
 494             }
 495         }
 496
 497         send_gdb "y\n"
 498
 499         set test "run to main"
 500         gdb_test_multiple "" $test {
 501             -re "Temporary breakpoint .* main .*$gdb_prompt $" {
 502                 pass $test
 503             }
 504         }
 505
 506         # Get rid of the process
 507         kill_wait_spawned_process $test_spawn_id
 508     }
 509 }
 510
 511
 512 # This is a test of 'set exec-file-mismatch' handling.
 513
 514 proc_with_prefix do_attach_exec_mismatch_handling_tests {} {
 515     global gdb_prompt
 516     global binfile
 517     global binfile2
 518
 519     clean_restart $binfile
 520
 521     # Start two programs that can be attached to.
 522     # The first program contains a 'int bidule' variable, the second a 'float bidule'.
 523
 524     set test_spawn_id [spawn_wait_for_attach $binfile]
 525     set testpid [spawn_id_get_pid $test_spawn_id]
 526     set test_spawn_id2 [spawn_wait_for_attach $binfile2]
 527     set testpid2 [spawn_id_get_pid $test_spawn_id2]
 528
 529
 530     # Test with the default value of 'set exec-file-mismatch load".
 531     set test "mismatch load"
 532     gdb_test "attach $testpid" "Attaching to program.*" "$test attach1"
 533     # Verify that we can "see" the variable "bidule" in the
 534     # program, and that it is an integer.
 535     gdb_test "ptype bidule" " = int" "$test after attach1, bidule is int"
 536     # Detach the process.
 537     gdb_test "detach" "Detaching from program: .* detached\\\]" "$test detach1"
 538     gdb_test_multiple "attach $testpid2" "$test attach2" {
 539         -re "Attaching to program.*exec-file-mismatch handling is currently \"ask\".*Load new symbol table from .*attach2\".*\(y or n\)" {
 540             pass "$test attach2"
 541         }
 542     }
 543     gdb_test "y" "Reading symbols from .*attach2.*" "$test load attach2"
 544     # Verify that we can "see" the variable "bidule" in the
 545     # program, and that it is a float.
 546     gdb_test "ptype bidule" " = float" "$test after attach2 and load, bidule is float"
 547     # Detach the process.
 548     gdb_test "detach" "Detaching from program: .* detached\\\]" "$test detach attach2"
 549
 550
 551     # Test with 'set exec-file-mismatch warn".
 552     set test "mismatch warn"
 553     gdb_test_no_output "set exec-file-mismatch warn"
 554     gdb_test_multiple "attach $testpid" "$test attach" {
 555         -re "Attaching to program.*exec-file-mismatch handling is currently \"warn\".*$gdb_prompt" {
 556             pass "$test attach"
 557         }
 558     }
 559     # Verify that we still (wrongly) "see" the variable "bidule" as a float,
 560     # as we have not loaded the correct exec-file.
 561     gdb_test "ptype bidule" " = float" "$test after attach and warn, bidule is float"
 562     # Detach the process.
 563     gdb_test "detach" "Detaching from program: .* detached\\\]" "$test detach attach"
 564
 565
 566     # Same test but with 'set exec-file-mismatch off".
 567     set test "mismatch off"
 568     gdb_test_no_output "set exec-file-mismatch off"
 569     gdb_test_multiple "attach $testpid" "$test attach" {
 570         -re "Attaching to program.*$gdb_prompt" {
 571             pass "$test attach"
 572         }
 573     }
 574     # Verify that we still (wrongly) "see" the variable "bidule" as a float,
 575     # as we have not warned the user and not loaded the correct exec-file
 576     gdb_test "ptype bidule" " = float" "$test after attach and warn, bidule is float"
 577     # Detach the process.
 578     gdb_test "detach" "Detaching from program: .* detached\\\]" "$test detach attach"
 579
 580
 581     # Don't leave a process around
 582     kill_wait_spawned_process $test_spawn_id
 583     kill_wait_spawned_process $test_spawn_id2
 584 }
 585
 586 do_attach_tests
 587 do_attach_failure_tests
 588 do_call_attach_tests
 589 do_attach_exec_mismatch_handling_tests
 590
 591 # Test "gdb --pid"
 592
 593 do_command_attach_tests
 594
 595
 596 test_command_line_attach_run
 597
 598 return 0