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#   Copyright 1997, 1999, 2007, 2008, 2009, 2010

#   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 .

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

   # Force $srcfile as the current GDB source can be in glibc sourcetree.

   gdb_test "break $srcfile:$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