gdb/testsuite/gdb.base/foll-fork.exp

   1 #   Copyright 1997, 1999, 2007, 2008 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 { [is_remote target] || ![isnative] } then {
  17     continue
  18 }
  19
  20 set prms_id 0
  21 set bug_id 0
  22
  23 global srcfile
  24 set testfile "foll-fork"
  25 set srcfile ${testfile}.c
  26 set binfile ${objdir}/${subdir}/${testfile}
  27
  28 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  29      untested foll-fork.exp
  30      return -1
  31 }
  32
  33
  34
  35 # Until "set follow-fork-mode" and "catch fork" are implemented on
  36 # other targets...
  37 #
  38 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
  39     continue
  40 }
  41
  42 proc check_fork_catchpoints {} {
  43   global gdb_prompt
  44
  45   # Verify that the system supports "catch fork".
  46   gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "insert first fork catchpoint"
  47   set has_fork_catchpoints 0
  48   gdb_test_multiple "continue" "continue to first fork catchpoint" {
  49     -re ".*Your system does not support fork catchpoints.*$gdb_prompt $" {
  50       unsupported "continue to first fork catchpoint"
  51     }
  52     -re ".*Catchpoint.*$gdb_prompt $" {
  53       set has_fork_catchpoints 1
  54       pass "continue to first fork catchpoint"
  55     }
  56   }
  57
  58   if {$has_fork_catchpoints == 0} {
  59     unsupported "fork catchpoints"
  60     return -code return
  61   }
  62 }
  63
  64 proc default_fork_parent_follow {} {
  65    global gdb_prompt
  66
  67    send_gdb "show follow\n"
  68    gdb_expect {
  69       -re "Debugger response to a program call of fork or vfork is \"parent\"..*$gdb_prompt $"\
  70                       {pass "default show parent follow, no catchpoints"}
  71       -re "$gdb_prompt $" {fail "default show parent follow, no catchpoints"}
  72       timeout         {fail "(timeout) default show parent follow, no catchpoints"}
  73    }
  74    send_gdb "next 2\n"
  75    gdb_expect {
  76       -re "Detaching after fork from.*$gdb_prompt $"\
  77                       {pass "default parent follow, no catchpoints"}
  78       -re "$gdb_prompt $" {fail "default parent follow, no catchpoints"}
  79       timeout         {fail "(timeout) default parent follow, no catchpoints" }
  80    }
  81    # The child has been detached; allow time for any output it might
  82    # generate to arrive, so that output doesn't get confused with
  83    # any expected debugger output from a subsequent testpoint.
  84    #
  85    exec sleep 1
  86 }
  87
  88 proc explicit_fork_parent_follow {} {
  89    global gdb_prompt
  90
  91    send_gdb "set follow parent\n"
  92    gdb_expect {
  93       -re "$gdb_prompt $" {pass "set follow parent"}
  94       timeout         {fail "(timeout) set follow parent"}
  95    }
  96    send_gdb "show follow\n"
  97    gdb_expect {
  98       -re "Debugger response to a program call of fork or vfork is \"parent\"..*$gdb_prompt $"\
  99                       {pass "explicit show parent follow, no catchpoints"}
 100       -re "$gdb_prompt $" {fail "explicit show parent follow, no catchpoints"}
 101       timeout         {fail "(timeout) explicit show parent follow, no catchpoints"}
 102    }
 103    send_gdb "next 2\n"
 104    gdb_expect {
 105       -re "Detaching after fork from.*$gdb_prompt $"\
 106                       {pass "explicit parent follow, no catchpoints"}
 107       -re "$gdb_prompt $" {fail "explicit parent follow, no catchpoints"}
 108       timeout         {fail "(timeout) explicit parent follow, no catchpoints"}
 109    }
 110    # The child has been detached; allow time for any output it might
 111    # generate to arrive, so that output doesn't get confused with
 112    # any expected debugger output from a subsequent testpoint.
 113    #
 114    exec sleep 1
 115 }
 116
 117 proc explicit_fork_child_follow {} {
 118    global gdb_prompt
 119
 120    send_gdb "set follow child\n"
 121    gdb_expect {
 122       -re "$gdb_prompt $" {pass "set follow child"}
 123       timeout         {fail "(timeout) set follow child"}
 124    }
 125    send_gdb "show follow\n"
 126    gdb_expect {
 127       -re "Debugger response to a program call of fork or vfork is \"child\"..*$gdb_prompt $"\
 128                       {pass "explicit show child follow, no catchpoints"}
 129       -re "$gdb_prompt $" {fail "explicit show child follow, no catchpoints"}
 130       timeout         {fail "(timeout) explicit show child follow, no catchpoints"}
 131    }
 132    send_gdb "next 2\n"
 133    gdb_expect {
 134       -re "Attaching after fork to.*$gdb_prompt $"\
 135                       {pass "explicit child follow, no catchpoints"}
 136       -re "$gdb_prompt $" {fail "explicit child follow, no catchpoints"}
 137       timeout         {fail "(timeout) explicit child follow, no catchpoints"}
 138    }
 139    # The child has been detached; allow time for any output it might
 140    # generate to arrive, so that output doesn't get confused with
 141    # any gdb_expected debugger output from a subsequent testpoint.
 142    #
 143    exec sleep 1
 144 }
 145
 146 proc catch_fork_child_follow {} {
 147    global gdb_prompt
 148    global srcfile
 149
 150    send_gdb "catch fork\n"
 151    gdb_expect {
 152       -re "Catchpoint .*(fork).*$gdb_prompt $"\
 153                       {pass "explicit child follow, set catch fork"}
 154       -re "$gdb_prompt $" {fail "explicit child follow, set catch fork"}
 155       timeout         {fail "(timeout) explicit child follow, set catch fork"}
 156    }
 157
 158    # Verify that the catchpoint is mentioned in an "info breakpoints",
 159    # and further that the catchpoint mentions no process id.
 160    #
 161    set test_name "info shows catchpoint without pid"
 162    gdb_test_multiple "info breakpoints" "$test_name" {
 163      -re ".*catchpoint.*keep y.*fork\[\r\n\]+$gdb_prompt $" {
 164        pass "$test_name"
 165      }
 166    }
 167
 168    send_gdb "continue\n"
 169    gdb_expect {
 170       -re "Catchpoint.*(forked process.*),.*in .*(fork|__kernel_vsyscall).*$gdb_prompt $"\
 171                       {pass "explicit child follow, catch fork"}
 172       -re "$gdb_prompt $" {fail "explicit child follow, catch fork"}
 173       timeout         {fail "(timeout) explicit child follow, catch fork"}
 174    }
 175
 176    # Verify that the catchpoint is mentioned in an "info breakpoints",
 177    # and further that the catchpoint managed to capture a process id.
 178    #
 179    set test_name "info shows catchpoint without pid"
 180    gdb_test_multiple "info breakpoints" "$test_name" {
 181      -re ".*catchpoint.*keep y.*fork, process.*$gdb_prompt $" {
 182        pass "$test_name"
 183      }
 184    }
 185
 186    send_gdb "set follow child\n"
 187    gdb_expect {
 188       -re "$gdb_prompt $" {pass "set follow child"}
 189       timeout         {fail "(timeout) set follow child"}
 190    }
 191    send_gdb "tbreak ${srcfile}:24\n"
 192    gdb_expect {
 193       -re "Temporary breakpoint.*, line 24.*$gdb_prompt $"\
 194                       {pass "set follow child, tbreak"}
 195       -re "$gdb_prompt $" {fail "set follow child, tbreak"}
 196       timeout         {fail "(timeout) set follow child, tbreak"}
 197    }
 198    send_gdb "continue\n"
 199    gdb_expect {
 200       -re "Attaching after fork to.* at .*24.*$gdb_prompt $"\
 201                       {pass "set follow child, hit tbreak"}
 202       -re "$gdb_prompt $" {fail "set follow child, hit tbreak"}
 203       timeout         {fail "(timeout) set follow child, hit tbreak"}
 204    }
 205    # The child has been detached; allow time for any output it might
 206    # generate to arrive, so that output doesn't get confused with
 207    # any expected debugger output from a subsequent testpoint.
 208    #
 209    exec sleep 1
 210    send_gdb "delete breakpoints\n"
 211    gdb_expect {
 212       -re "Delete all breakpoints.*$" {
 213          send_gdb "y\n"
 214          gdb_expect {
 215             -re "$gdb_prompt $"\
 216                     {pass "set follow child, cleanup"}
 217             timeout {fail "(timeout) set follow child, cleanup"}
 218          }
 219       }
 220       -re "$gdb_prompt $" {fail "set follow child, cleanup"}
 221       timeout         {fail "(timeout) set follow child, cleanup"}
 222    }
 223 }
 224
 225 proc tcatch_fork_parent_follow {} {
 226    global gdb_prompt
 227    global srcfile
 228
 229    send_gdb "catch fork\n"
 230    gdb_expect {
 231       -re "Catchpoint .*(fork).*$gdb_prompt $"\
 232                       {pass "explicit parent follow, set tcatch fork"}
 233       -re "$gdb_prompt $" {fail "explicit parent follow, set tcatch fork"}
 234       timeout         {fail "(timeout) explicit parent follow, set tcatch fork"}
 235    }
 236 # ??rehrauer: I don't yet know how to get the id of the tcatch
 237 # via this script, so that I can add a -do list to it.  For now,
 238 # do the follow stuff after the catch happens.
 239
 240    send_gdb "continue\n"
 241    gdb_expect {
 242       -re ".*in .*(fork|__kernel_vsyscall).*$gdb_prompt $"\
 243                       {pass "explicit parent follow, tcatch fork"}
 244       -re "$gdb_prompt $" {fail "explicit parent follow, tcatch fork"}
 245       timeout         {fail "(timeout) explicit parent follow, tcatch fork"}
 246    }
 247    send_gdb "set follow parent\n"
 248    gdb_expect {
 249       -re "$gdb_prompt $" {pass "set follow parent"}
 250       timeout         {fail "(timeout) set follow parent"}
 251    }
 252    send_gdb "tbreak ${srcfile}:24\n"
 253    gdb_expect {
 254       -re "Temporary breakpoint.*, line 24.*$gdb_prompt $"\
 255                       {pass "set follow parent, tbreak"}
 256       -re "$gdb_prompt $" {fail "set follow parent, tbreak"}
 257       timeout         {fail "(timeout) set follow child, tbreak"}
 258    }
 259    send_gdb "continue\n"
 260    gdb_expect {
 261       -re ".*Detaching after fork from.* at .*24.*$gdb_prompt $"\
 262                       {pass "set follow parent, hit tbreak"}
 263       -re "$gdb_prompt $" {fail "set follow parent, hit tbreak"}
 264       timeout         {fail "(timeout) set follow parent, hit tbreak"}
 265    }
 266    # The child has been detached; allow time for any output it might
 267    # generate to arrive, so that output doesn't get confused with
 268    # any expected debugger output from a subsequent testpoint.
 269    #
 270    exec sleep 1
 271    send_gdb "delete breakpoints\n"
 272    gdb_expect {
 273       -re "Delete all breakpoints.*$" {
 274          send_gdb "y\n"
 275          gdb_expect {
 276             -re "$gdb_prompt $"\
 277                     {pass "set follow parent, cleanup"}
 278             timeout {fail "(timeout) set follow parent, cleanup"}
 279          }
 280       }
 281       -re "$gdb_prompt $" {fail "set follow parent, cleanup"}
 282       timeout         {fail "(timeout) set follow parent, cleanup"}
 283    }
 284 }
 285
 286 proc do_fork_tests {} {
 287    global gdb_prompt
 288
 289    # Verify that help is available for "set follow-fork-mode".
 290    #
 291    send_gdb "help set follow-fork-mode\n"
 292    gdb_expect {
 293       -re "Set debugger response to a program call of fork or vfork..*
 294 A fork or vfork creates a new process.  follow-fork-mode can be:.*
 295 .*parent  - the original process is debugged after a fork.*
 296 .*child   - the new process is debugged after a fork.*
 297 The unfollowed process will continue to run..*
 298 By default, the debugger will follow the parent process..*$gdb_prompt $"\
 299                       { pass "help set follow" }
 300       -re "$gdb_prompt $" { fail "help set follow" }
 301       timeout         { fail "(timeout) help set follow" }
 302    }
 303
 304    # Verify that we can set follow-fork-mode, using an abbreviation
 305    # for both the flag and its value.
 306    #
 307    send_gdb "set follow ch\n"
 308    send_gdb "show fol\n"
 309    gdb_expect {
 310      -re "Debugger response to a program call of fork or vfork is \"child\".*$gdb_prompt $"\
 311              {pass "set follow, using abbreviations"}
 312      timeout {fail "(timeout) set follow, using abbreviations"}
 313    }
 314
 315    # Verify that we cannot set follow-fork-mode to nonsense.
 316    #
 317    send_gdb "set follow chork\n"
 318    gdb_expect {
 319      -re "Undefined item: \"chork\".*$gdb_prompt $"\
 320                      {pass "set follow to nonsense is prohibited"}
 321      -re "$gdb_prompt $" {fail "set follow to nonsense is prohibited"}
 322      timeout         {fail "(timeout) set follow to nonsense is prohibited"}
 323    }
 324    send_gdb "set follow parent\n"
 325    gdb_expect {
 326      -re "$gdb_prompt $" {pass "set follow to nonsense is prohibited (reset parent)"}
 327      timeout         {fail "set follow to nonsense is prohibited (reset parent)"}
 328    }
 329
 330    # Check that fork catchpoints are supported, as an indicator for whether
 331    # fork-following is supported.
 332    if [runto_main] then { check_fork_catchpoints }
 333
 334    # Test the default behaviour, which is to follow the parent of a
 335    # fork, and detach from the child.  Do this without catchpoints.
 336    #
 337    if [runto_main] then { default_fork_parent_follow }
 338
 339    # Test the ability to explicitly follow the parent of a fork, and
 340    # detach from the child.  Do this without catchpoints.
 341    #
 342    if [runto_main] then { explicit_fork_parent_follow }
 343
 344    # Test the ability to follow the child of a fork, and detach from
 345    # the parent.  Do this without catchpoints.
 346    #
 347    if [runto_main] then { explicit_fork_child_follow }
 348
 349    # Test the ability to follow both child and parent of a fork.  Do
 350    # this without catchpoints.
 351    # ??rehrauer: NYI.  Will add testpoints here when implemented.
 352    #
 353
 354    # Test the ability to have the debugger ask the user at fork-time
 355    # whether to follow the parent, child or both.  Do this without
 356    # catchpoints.
 357    # ??rehrauer: NYI.  Will add testpoints here when implemented.
 358    #
 359
 360    # Test the ability to catch a fork, specify that the child be
 361    # followed, and continue.  Make the catchpoint permanent.
 362    #
 363    if [runto_main] then { catch_fork_child_follow }
 364
 365    # Test the ability to catch a fork, specify via a -do clause that
 366    # the parent be followed, and continue.  Make the catchpoint temporary.
 367    #
 368    if [runto_main] then { tcatch_fork_parent_follow }
 369 }
 370
 371 # Start with a fresh gdb
 372
 373 gdb_exit
 374 gdb_start
 375 gdb_reinitialize_dir $srcdir/$subdir
 376 gdb_load ${binfile}
 377
 378 # The "Detaching..." and "Attaching..." messages may be hidden by
 379 # default.
 380 gdb_test "set verbose" ""
 381
 382 # This is a test of gdb's ability to follow the parent, child or both
 383 # parent and child of a Unix fork() system call.
 384 #
 385 do_fork_tests
 386
 387 return 0