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

#   Copyright 1997, 1999, 2007, 2008, 2009 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/>.

if { [is_remote target] || ![isnative] } then {
    continue
}

set prms_id 0
set bug_id 0

global srcfile
set testfile "foll-fork"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
     untested foll-fork.exp
     return -1
}



# Until "set follow-fork-mode" and "catch fork" are implemented on
# other targets...
#
if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
    continue
}

proc check_fork_catchpoints {} {
  global gdb_prompt

  # Verify that the system supports "catch fork".
  gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "insert first fork catchpoint"
  set has_fork_catchpoints 0
  gdb_test_multiple "continue" "continue to first fork catchpoint" {
    -re ".*Your system does not support fork catchpoints.*$gdb_prompt $" {
      unsupported "continue to first fork catchpoint"
    }
    -re ".*Catchpoint.*$gdb_prompt $" {
      set has_fork_catchpoints 1
      pass "continue to first fork catchpoint"
    }
  }

  if {$has_fork_catchpoints == 0} {
    unsupported "fork catchpoints"
    return -code return
  }
}

proc default_fork_parent_follow {} {
   global gdb_prompt

   send_gdb "show follow-fork\n"
   gdb_expect {
      -re "Debugger response to a program call of fork or vfork is \"parent\"..*$gdb_prompt $"\
                      {pass "default show parent follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "default show parent follow, no catchpoints"}
      timeout         {fail "(timeout) default show parent follow, no catchpoints"}
   }
   send_gdb "next 2\n"
   gdb_expect {
      -re "Detaching after fork from.*$gdb_prompt $"\
                      {pass "default parent follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "default parent follow, no catchpoints"}
      timeout         {fail "(timeout) default parent follow, no catchpoints" }
   }
   # 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 explicit_fork_parent_follow {} {
   global gdb_prompt

   send_gdb "set follow-fork parent\n"
   gdb_expect {
      -re "$gdb_prompt $" {pass "set follow-fork parent"}
      timeout         {fail "(timeout) set follow-fork parent"}
   }
   send_gdb "show follow-fork\n"
   gdb_expect {
      -re "Debugger response to a program call of fork or vfork is \"parent\"..*$gdb_prompt $"\
                      {pass "explicit show parent follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "explicit show parent follow, no catchpoints"}
      timeout         {fail "(timeout) explicit show parent follow, no catchpoints"}
   }
   send_gdb "next 2\n"
   gdb_expect {
      -re "Detaching after fork from.*$gdb_prompt $"\
                      {pass "explicit parent follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "explicit parent follow, no catchpoints"}
      timeout         {fail "(timeout) explicit parent follow, no catchpoints"}
   }
   # 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 explicit_fork_child_follow {} {
   global gdb_prompt

   send_gdb "set follow-fork child\n"
   gdb_expect {
      -re "$gdb_prompt $" {pass "set follow-fork child"}
      timeout         {fail "(timeout) set follow-fork child"}
   }
   send_gdb "show follow-fork\n"
   gdb_expect {
      -re "Debugger response to a program call of fork or vfork is \"child\"..*$gdb_prompt $"\
                      {pass "explicit show child follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "explicit show child follow, no catchpoints"}
      timeout         {fail "(timeout) explicit show child follow, no catchpoints"}
   }
   send_gdb "next 2\n"
   gdb_expect {
      -re "Attaching after.* fork to.*$gdb_prompt $"\
                      {pass "explicit child follow, no catchpoints"}
      -re "$gdb_prompt $" {fail "explicit child follow, no catchpoints"}
      timeout         {fail "(timeout) explicit child follow, no catchpoints"}
   }
   # 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 catch_fork_child_follow {} {
   global gdb_prompt
   global srcfile

   set bp_after_fork [gdb_get_line_number "set breakpoint here"]

   send_gdb "catch fork\n"
   gdb_expect {
      -re "Catchpoint .*(fork).*$gdb_prompt $"\
                      {pass "explicit child follow, set catch fork"}
      -re "$gdb_prompt $" {fail "explicit child follow, set catch fork"}
      timeout         {fail "(timeout) explicit child follow, set catch fork"}
   }

   # Verify that the catchpoint is mentioned in an "info breakpoints",
   # and further that the catchpoint mentions no process id.
   #
   set test_name "info shows catchpoint without pid"
   gdb_test_multiple "info breakpoints" "$test_name" {
     -re ".*catchpoint.*keep y.*fork\[\r\n\]+$gdb_prompt $" {
       pass "$test_name"
     }
   }

   send_gdb "continue\n"
   gdb_expect {
      -re "Catchpoint.*(forked process.*),.*in .*(fork|__kernel_v?syscall).*$gdb_prompt $"\
                      {pass "explicit child follow, catch fork"}
      -re "$gdb_prompt $" {fail "explicit child follow, catch fork"}
      timeout         {fail "(timeout) explicit child follow, catch fork"}
   }

   # Verify that the catchpoint is mentioned in an "info breakpoints",
   # and further that the catchpoint managed to capture a process id.
   #
   set test_name "info shows catchpoint without pid"
   gdb_test_multiple "info breakpoints" "$test_name" {
     -re ".*catchpoint.*keep y.*fork, process.*$gdb_prompt $" {
       pass "$test_name"
     }
   }

   send_gdb "set follow-fork child\n"
   gdb_expect {
      -re "$gdb_prompt $" {pass "set follow-fork child"}
      timeout         {fail "(timeout) set follow-fork child"}
   }
   send_gdb "tbreak ${srcfile}:$bp_after_fork\n"
   gdb_expect {
      -re "Temporary breakpoint.*, line $bp_after_fork.*$gdb_prompt $"\
                      {pass "set follow-fork child, tbreak"}
      -re "$gdb_prompt $" {fail "set follow-fork child, tbreak"}
      timeout         {fail "(timeout) set follow-fork child, tbreak"}
   }
   send_gdb "continue\n"
   gdb_expect {
      -re "Attaching after.* fork to.* at .*$bp_after_fork.*$gdb_prompt $"\
                      {pass "set follow-fork child, hit tbreak"}
      -re "$gdb_prompt $" {fail "set follow-fork child, hit tbreak"}
      timeout         {fail "(timeout) set follow-fork child, hit tbreak"}
   }
   # The parent has been detached; allow time for any output it might
   # generate to arrive, so that output doesn't get confused with
   # any expected debugger output from a subsequent testpoint.
   #
   exec sleep 1
   send_gdb "delete breakpoints\n"
   gdb_expect {
      -re "Delete all breakpoints.*$" {
         send_gdb "y\n"
         gdb_expect {
            -re "$gdb_prompt $"\
                    {pass "set follow-fork child, cleanup"}
            timeout {fail "(timeout) set follow-fork child, cleanup"}
         }
      }
      -re "$gdb_prompt $" {fail "set follow-fork child, cleanup"}
      timeout         {fail "(timeout) set follow-fork child, cleanup"}
   }
}

proc catch_fork_unpatch_child {} {
   global gdb_prompt
   global srcfile

   set bp_exit [gdb_get_line_number "at exit"]

   gdb_test "break callee" "file .*$srcfile, line .*" "unpatch child, break at callee"
   gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "unpatch child, set catch fork"

   gdb_test "continue" \
       "Catchpoint.*\\(forked process.*\\).*,.*in .*(fork|__kernel_v?syscall).*" \
       "unpatch child, catch fork"

   # Delete all breakpoints and catchpoints.
   delete_breakpoints

   gdb_test "break $bp_exit" \
       "Breakpoint .*file .*$srcfile, line .*" \
       "unpatch child, breakpoint at exit call"

   gdb_test "set follow-fork child" "" "unpatch child, set follow-fork child"

   set test "unpatch child, unpatched parent breakpoints from child"
   gdb_test_multiple "continue" $test {
      -re "at exit.*$gdb_prompt $" {
	  pass "$test"
      }
      -re "SIGTRAP.*$gdb_prompt $" {
	  fail "$test"

	  # Explicitly kill this child, so we can continue gracefully
	  # with further testing...
	  send_gdb "kill\n"
	  gdb_expect {
	      -re ".*Kill the program being debugged.*y or n. $" {
		  send_gdb "y\n"
		  gdb_expect -re "$gdb_prompt $" {}
	      }
	  }
      }
      -re ".*$gdb_prompt $" {
	  fail "$test (unknown output)"
      }
      timeout {
	  fail "$test (timeout)"
      }
   }
}

proc tcatch_fork_parent_follow {} {
   global gdb_prompt
   global srcfile

   set bp_after_fork [gdb_get_line_number "set breakpoint here"]

   send_gdb "catch fork\n"
   gdb_expect {
      -re "Catchpoint .*(fork).*$gdb_prompt $"\
                      {pass "explicit parent follow, set tcatch fork"}
      -re "$gdb_prompt $" {fail "explicit parent follow, set tcatch fork"}
      timeout         {fail "(timeout) explicit parent follow, set tcatch fork"}
   }
# ??rehrauer: I don't yet know how to get the id of the tcatch
# via this script, so that I can add a -do list to it.  For now,
# do the follow stuff after the catch happens.

   send_gdb "continue\n"
   gdb_expect {
      -re ".*in .*(fork|__kernel_v?syscall).*$gdb_prompt $"\
                      {pass "explicit parent follow, tcatch fork"}
      -re "$gdb_prompt $" {fail "explicit parent follow, tcatch fork"}
      timeout         {fail "(timeout) explicit parent follow, tcatch fork"}
   }
   send_gdb "set follow-fork parent\n"
   gdb_expect {
      -re "$gdb_prompt $" {pass "set follow-fork parent"}
      timeout         {fail "(timeout) set follow-fork parent"}
   }
   send_gdb "tbreak ${srcfile}:$bp_after_fork\n"
   gdb_expect {
      -re "Temporary breakpoint.*, line $bp_after_fork.*$gdb_prompt $"\
                      {pass "set follow-fork parent, tbreak"}
      -re "$gdb_prompt $" {fail "set follow-fork parent, tbreak"}
      timeout         {fail "(timeout) set follow-fork child, tbreak"}
   }
   send_gdb "continue\n"
   gdb_expect {
      -re ".*Detaching after fork from.* at .*$bp_after_fork.*$gdb_prompt $"\
                      {pass "set follow-fork parent, hit tbreak"}
      -re "$gdb_prompt $" {fail "set follow-fork parent, hit tbreak"}
      timeout         {fail "(timeout) set follow-fork parent, hit tbreak"}
   }
   # The child has been detached; allow time for any output it might
   # generate to arrive, so that output doesn't get confused with
   # any expected debugger output from a subsequent testpoint.
   #
   exec sleep 1
   send_gdb "delete breakpoints\n"
   gdb_expect {
      -re "Delete all breakpoints.*$" {
         send_gdb "y\n"
         gdb_expect {
            -re "$gdb_prompt $"\
                    {pass "set follow-fork parent, cleanup"}
            timeout {fail "(timeout) set follow-fork parent, cleanup"}
         }
      }
      -re "$gdb_prompt $" {fail "set follow-fork parent, cleanup"}
      timeout         {fail "(timeout) set follow-fork parent, cleanup"}
   }
}

proc do_fork_tests {} {
   global gdb_prompt

   # Verify that help is available for "set follow-fork-mode".
   #
   send_gdb "help set follow-fork-mode\n"
   gdb_expect {
      -re "Set debugger response to a program call of fork or vfork..*
A fork or vfork creates a new process.  follow-fork-mode can be:.*
.*parent  - the original process is debugged after a fork.*
.*child   - the new process is debugged after a fork.*
The unfollowed process will continue to run..*
By default, the debugger will follow the parent process..*$gdb_prompt $"\
                      { pass "help set follow-fork" }
      -re "$gdb_prompt $" { fail "help set follow" }
      timeout         { fail "(timeout) help set follow-fork" }
   }

   # Verify that we can set follow-fork-mode, using an abbreviation
   # for both the flag and its value.
   #
   send_gdb "set follow-fork ch\n"
   send_gdb "show follow-fork\n"
   gdb_expect {
     -re "Debugger response to a program call of fork or vfork is \"child\".*$gdb_prompt $"\
             {pass "set follow-fork, using abbreviations"}
     timeout {fail "(timeout) set follow-fork, using abbreviations"}
   }

   # Verify that we cannot set follow-fork-mode to nonsense.
   #
   send_gdb "set follow-fork chork\n"
   gdb_expect {
     -re "Undefined item: \"chork\".*$gdb_prompt $"\
                     {pass "set follow-fork to nonsense is prohibited"}
     -re "$gdb_prompt $" {fail "set follow-fork to nonsense is prohibited"}
     timeout         {fail "(timeout) set follow-fork to nonsense is prohibited"}
   }
   send_gdb "set follow-fork parent\n"
   gdb_expect {
     -re "$gdb_prompt $" {pass "set follow-fork to nonsense is prohibited (reset parent)"}
     timeout         {fail "set follow-fork to nonsense is prohibited (reset parent)"}
   }

   # Check that fork catchpoints are supported, as an indicator for whether
   # fork-following is supported.
   if [runto_main] then { check_fork_catchpoints }

   # Test the default behaviour, which is to follow the parent of a
   # fork, and detach from the child.  Do this without catchpoints.
   #
   if [runto_main] then { default_fork_parent_follow }

   # Test the ability to explicitly follow the parent of a fork, and
   # detach from the child.  Do this without catchpoints.
   #
   if [runto_main] then { explicit_fork_parent_follow }

   # Test the ability to follow the child of a fork, and detach from
   # the parent.  Do this without catchpoints.
   #
   if [runto_main] then { explicit_fork_child_follow }

   # Test the ability to follow both child and parent of a fork.  Do
   # this without catchpoints.
   # ??rehrauer: NYI.  Will add testpoints here when implemented.
   #

   # Test the ability to have the debugger ask the user at fork-time
   # whether to follow the parent, child or both.  Do this without
   # catchpoints.
   # ??rehrauer: NYI.  Will add testpoints here when implemented.
   #

   # Test the ability to catch a fork, specify that the child be
   # followed, and continue.  Make the catchpoint permanent.
   #
   if [runto_main] then { catch_fork_child_follow }

   # Test that parent breakpoints are successfully detached from the
   # child at fork time, even if the user removes them from the
   # breakpoints list after stopping at a fork catchpoint.
   if [runto_main] then { catch_fork_unpatch_child }

   # Test the ability to catch a fork, specify via a -do clause that
   # the parent be followed, and continue.  Make the catchpoint temporary.
   #
   if [runto_main] then { tcatch_fork_parent_follow }
}

# Start with a fresh gdb

gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

# The "Detaching..." and "Attaching..." messages may be hidden by
# default.
gdb_test "set verbose" ""

# This is a test of gdb's ability to follow the parent, child or both
# parent and child of a Unix fork() system call.
#
do_fork_tests

return 0