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

   1 #   Copyright 1997, 1999, 2007, 2008, 2009, 2010
   2 #   Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 if { [is_remote target] || ![isnative] } then {
  18     continue
  19 }
  20
  21
  22 global srcfile
  23 set testfile "foll-fork"
  24 set srcfile ${testfile}.c
  25 set binfile ${objdir}/${subdir}/${testfile}
  26
  27 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  28      untested foll-fork.exp
  29      return -1
  30 }
  31
  32
  33
  34 # Until "set follow-fork-mode" and "catch fork" are implemented on
  35 # other targets...
  36 #
  37 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
  38     continue
  39 }
  40
  41 proc check_fork_catchpoints {} {
  42   global gdb_prompt
  43
  44   # Verify that the system supports "catch fork".
  45   gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "insert first fork catchpoint"
  46   set has_fork_catchpoints 0
  47   gdb_test_multiple "continue" "continue to first fork catchpoint" {
  48     -re ".*Your system does not support fork catchpoints.*$gdb_prompt $" {
  49       unsupported "continue to first fork catchpoint"
  50     }
  51     -re ".*Catchpoint.*$gdb_prompt $" {
  52       set has_fork_catchpoints 1
  53       pass "continue to first fork catchpoint"
  54     }
  55   }
  56
  57   if {$has_fork_catchpoints == 0} {
  58     unsupported "fork catchpoints"
  59     return -code return
  60   }
  61 }
  62
  63 proc default_fork_parent_follow {} {
  64     global gdb_prompt
  65
  66     gdb_test "show follow-fork" \
  67         "Debugger response to a program call of fork or vfork is \"parent\".*" \
  68         "default show parent follow, no catchpoints"
  69
  70     gdb_test "next 2" \
  71         "Detaching after fork from.*" \
  72         "default parent follow, no catchpoints"
  73
  74     # The child has been detached; allow time for any output it might
  75     # generate to arrive, so that output doesn't get confused with
  76     # any expected debugger output from a subsequent testpoint.
  77     #
  78     exec sleep 1
  79 }
  80
  81 proc explicit_fork_parent_follow {} {
  82     global gdb_prompt
  83
  84     gdb_test_no_output "set follow-fork parent"
  85
  86     gdb_test "show follow-fork" \
  87         "Debugger response to a program call of fork or vfork is \"parent\"." \
  88         "explicit show parent follow, no catchpoints"
  89
  90     gdb_test "next 2" "Detaching after fork from.*" \
  91         "explicit parent follow, no catchpoints"
  92
  93     # The child has been detached; allow time for any output it might
  94     # generate to arrive, so that output doesn't get confused with
  95     # any expected debugger output from a subsequent testpoint.
  96     #
  97     exec sleep 1
  98 }
  99
 100 proc explicit_fork_child_follow {} {
 101     global gdb_prompt
 102
 103     gdb_test_no_output "set follow-fork child"
 104
 105     gdb_test "show follow-fork" \
 106         "Debugger response to a program call of fork or vfork is \"child\"." \
 107         "explicit show child follow, no catchpoints"
 108
 109     gdb_test "next 2" "Attaching after.* fork to.*" \
 110         "explicit child follow, no catchpoints"
 111
 112     # The child has been detached; allow time for any output it might
 113     # generate to arrive, so that output doesn't get confused with
 114     # any gdb_expected debugger output from a subsequent testpoint.
 115     #
 116     exec sleep 1
 117 }
 118
 119 proc catch_fork_child_follow {} {
 120     global gdb_prompt
 121     global srcfile
 122
 123     set bp_after_fork [gdb_get_line_number "set breakpoint here"]
 124
 125     gdb_test "catch fork" "Catchpoint .*(fork).*" \
 126         "explicit child follow, set catch fork"
 127
 128     # Verify that the catchpoint is mentioned in an "info breakpoints",
 129     # and further that the catchpoint mentions no process id.
 130     #
 131     set test_name "info shows catchpoint without pid"
 132     gdb_test_multiple "info breakpoints" "$test_name" {
 133         -re ".*catchpoint.*keep y.*fork\[\r\n\]+$gdb_prompt $" {
 134             pass "$test_name"
 135         }
 136     }
 137
 138     gdb_test "continue" \
 139         "Catchpoint.*(forked process.*),.*in .*(fork|__kernel_v?syscall).*" \
 140         "explicit child follow, catch fork"
 141
 142     # Verify that the catchpoint is mentioned in an "info breakpoints",
 143     # and further that the catchpoint managed to capture a process id.
 144     #
 145     set test_name "info shows catchpoint without pid"
 146     gdb_test_multiple "info breakpoints" "$test_name" {
 147         -re ".*catchpoint.*keep y.*fork, process.*$gdb_prompt $" {
 148             pass "$test_name"
 149         }
 150     }
 151
 152     gdb_test_no_output "set follow-fork child"
 153
 154     gdb_test "tbreak ${srcfile}:$bp_after_fork" \
 155         "Temporary breakpoint.*, line $bp_after_fork.*" \
 156         "set follow-fork child, tbreak"
 157
 158     gdb_test "continue" \
 159         "Attaching after.* fork to.* at .*$bp_after_fork.*" \
 160         "set follow-fork child, hit tbreak"
 161
 162     # The parent has been detached; allow time for any output it might
 163     # generate to arrive, so that output doesn't get confused with
 164     # any expected debugger output from a subsequent testpoint.
 165     #
 166     exec sleep 1
 167
 168     gdb_test "delete breakpoints" \
 169         "" \
 170         "set follow-fork child, cleanup" \
 171         "Delete all breakpoints.*$" \
 172         "y"
 173 }
 174
 175 proc catch_fork_unpatch_child {} {
 176     global gdb_prompt
 177     global srcfile
 178
 179     set bp_exit [gdb_get_line_number "at exit"]
 180
 181     gdb_test "break callee" "file .*$srcfile, line .*" \
 182         "unpatch child, break at callee"
 183     gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
 184         "unpatch child, set catch fork"
 185
 186     gdb_test "continue" \
 187         "Catchpoint.*\\(forked process.*\\).*,.*in .*(fork|__kernel_v?syscall).*" \
 188         "unpatch child, catch fork"
 189
 190     # Delete all breakpoints and catchpoints.
 191     delete_breakpoints
 192
 193     # Force $srcfile as the current GDB source can be in glibc sourcetree.
 194     gdb_test "break $srcfile:$bp_exit" \
 195         "Breakpoint .*file .*$srcfile, line .*" \
 196         "unpatch child, breakpoint at exit call"
 197
 198     gdb_test "set follow-fork child" "" "unpatch child, set follow-fork child"
 199
 200     set test "unpatch child, unpatched parent breakpoints from child"
 201     gdb_test_multiple "continue" $test {
 202         -re "at exit.*$gdb_prompt $" {
 203             pass "$test"
 204         }
 205         -re "SIGTRAP.*$gdb_prompt $" {
 206             fail "$test"
 207
 208             # Explicitly kill this child, so we can continue gracefully
 209             # with further testing...
 210             send_gdb "kill\n"
 211             gdb_expect {
 212                 -re ".*Kill the program being debugged.*y or n. $" {
 213                     send_gdb "y\n"
 214                     gdb_expect -re "$gdb_prompt $" {}
 215                 }
 216             }
 217         }
 218     }
 219 }
 220
 221 proc tcatch_fork_parent_follow {} {
 222     global gdb_prompt
 223     global srcfile
 224
 225     set bp_after_fork [gdb_get_line_number "set breakpoint here"]
 226
 227     gdb_test "catch fork" "Catchpoint .*(fork).*" \
 228         "explicit parent follow, set tcatch fork"
 229
 230 # ??rehrauer: I don't yet know how to get the id of the tcatch
 231 # via this script, so that I can add a -do list to it.  For now,
 232 # do the follow stuff after the catch happens.
 233
 234     gdb_test "continue" "in .*(fork|__kernel_v?syscall).*" \
 235         "explicit parent follow, tcatch fork"
 236
 237     gdb_test_no_output "set follow-fork parent"
 238
 239     gdb_test "tbreak ${srcfile}:$bp_after_fork" \
 240         "Temporary breakpoint.*, line $bp_after_fork.*" \
 241         "set follow-fork parent, tbreak"
 242
 243     gdb_test "continue" \
 244         "Detaching after fork from.* at .*$bp_after_fork.*" \
 245         "set follow-fork parent, hit tbreak"
 246
 247     # The child has been detached; allow time for any output it might
 248     # generate to arrive, so that output doesn't get confused with
 249     # any expected debugger output from a subsequent testpoint.
 250     #
 251     exec sleep 1
 252
 253     gdb_test "delete breakpoints" \
 254         "" \
 255         "set follow-fork parent, cleanup" \
 256         "Delete all breakpoints.*$" \
 257         "y"
 258 }
 259
 260 proc do_fork_tests {} {
 261     global gdb_prompt
 262
 263     # Verify that help is available for "set follow-fork-mode".
 264     #
 265     gdb_test "help set follow-fork-mode" \
 266         "Set debugger response to a program call of fork or vfork..*
 267 A fork or vfork creates a new process.  follow-fork-mode can be:.*
 268 .*parent  - the original process is debugged after a fork.*
 269 .*child   - the new process is debugged after a fork.*
 270 The unfollowed process will continue to run..*
 271 By default, the debugger will follow the parent process..*" \
 272         "help set follow-fork"
 273
 274     # Verify that we can set follow-fork-mode, using an abbreviation
 275     # for both the flag and its value.
 276     #
 277     gdb_test_no_output "set follow-fork ch"
 278
 279     gdb_test "show follow-fork" \
 280         "Debugger response to a program call of fork or vfork is \"child\".*" \
 281         "set follow-fork, using abbreviations"
 282
 283     # Verify that we cannot set follow-fork-mode to nonsense.
 284     #
 285     gdb_test "set follow-fork chork" "Undefined item: \"chork\".*" \
 286         "set follow-fork to nonsense is prohibited"
 287
 288     gdb_test_no_output "set follow-fork parent" "reset parent"
 289
 290     # Check that fork catchpoints are supported, as an indicator for whether
 291     # fork-following is supported.
 292     if [runto_main] then { check_fork_catchpoints }
 293
 294     # Test the default behaviour, which is to follow the parent of a
 295     # fork, and detach from the child.  Do this without catchpoints.
 296     #
 297     if [runto_main] then { default_fork_parent_follow }
 298
 299     # Test the ability to explicitly follow the parent of a fork, and
 300     # detach from the child.  Do this without catchpoints.
 301     #
 302     if [runto_main] then { explicit_fork_parent_follow }
 303
 304     # Test the ability to follow the child of a fork, and detach from
 305     # the parent.  Do this without catchpoints.
 306     #
 307     if [runto_main] then { explicit_fork_child_follow }
 308
 309     # Test the ability to follow both child and parent of a fork.  Do
 310     # this without catchpoints.
 311     # ??rehrauer: NYI.  Will add testpoints here when implemented.
 312     #
 313
 314     # Test the ability to have the debugger ask the user at fork-time
 315     # whether to follow the parent, child or both.  Do this without
 316     # catchpoints.
 317     # ??rehrauer: NYI.  Will add testpoints here when implemented.
 318     #
 319
 320     # Test the ability to catch a fork, specify that the child be
 321     # followed, and continue.  Make the catchpoint permanent.
 322     #
 323     if [runto_main] then { catch_fork_child_follow }
 324
 325     # Test that parent breakpoints are successfully detached from the
 326     # child at fork time, even if the user removes them from the
 327     # breakpoints list after stopping at a fork catchpoint.
 328     if [runto_main] then { catch_fork_unpatch_child }
 329
 330     # Test the ability to catch a fork, specify via a -do clause that
 331     # the parent be followed, and continue.  Make the catchpoint temporary.
 332     #
 333     if [runto_main] then { tcatch_fork_parent_follow }
 334 }
 335
 336 # Start with a fresh gdb
 337
 338 gdb_exit
 339 gdb_start
 340 gdb_reinitialize_dir $srcdir/$subdir
 341 gdb_load ${binfile}
 342
 343 # The "Detaching..." and "Attaching..." messages may be hidden by
 344 # default.
 345 gdb_test "set verbose" ""
 346
 347 # This is a test of gdb's ability to follow the parent, child or both
 348 # parent and child of a Unix fork() system call.
 349 #
 350 do_fork_tests
 351
 352 return 0