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#   Copyright 2005, 2006, 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 $tracelevel then {

        strace $tracelevel

        }

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

    continue

}

# Until "set follow-fork-mode" and "catch fork" are implemented on

# other targets...

#

if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then {

    continue

}

set prms_id 0

set bug_id 0

set testfile "multi-forks"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {

     untested multi-forks.exp

     return -1

}

# Start with a fresh gdb

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

global gdb_prompt

# This is a test of gdb's ability to follow the parent, child or both

# parent and child of multiple Unix fork() system calls.

set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]

# Insert a breakpoint at the location provided by the exit_bp_loc global

# and resume the execution until hitting that breakpoint.  We also make

# sure to consume all the expected output from all processes as well,

# to make sure it doesn't cause trouble during a subsequent test.

proc continue_to_exit_bp_loc {} {

    global exit_bp_loc decimal gdb_prompt

    gdb_breakpoint $exit_bp_loc

    send_gdb "continue\n"

    # The output from the child processes can be interleaved arbitrarily

    # with the output from GDB and the parent process.  If we don't

    # consume it all now, it can confuse later interactions.

    set seen_done 0

    set seen_break 0

    set seen_prompt 0

    set seen_timeout 0

    while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {

        # We don't know what order the interesting things will arrive in.

        # Using a pattern of the form 'x|y|z' instead of -re x ... -re y

        # ... -re z ensures that expect always chooses the match that

        # occurs leftmost in the input, and not the pattern appearing

        # first in the script that occurs anywhere in the input, so that

        # we don't skip anything.

        gdb_expect {

            -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {

                if {[info exists expect_out(1,string)]} {

                    incr seen_done

                } elseif {[info exists expect_out(2,string)]} {

                    set seen_break 1

                } elseif {[info exists expect_out(3,string)]} {

                    set seen_prompt 1

                }

                array unset expect_out

            }

            timeout { set seen_timeout 1 }

        }

    }

    if { $seen_timeout } {

        fail "run to exit 2 (timeout)"

    } elseif { ! $seen_prompt } {

        fail "run to exit 2 (no prompt)"

    } elseif { ! $seen_break } {

        fail "run to exit 2 (no breakpoint hit)"

    } elseif { $seen_done != 16 } {

        fail "run to exit 2 (missing done messages)"

    } else {

        pass "run to exit 2"

    }

}

# The inferior program builds a tree of processes by executing a loop

# four times, calling fork at each iteration.  Thus, at each

# iteration, the total number of processes doubles; after four

# iterations, we have 16 processes.  Each process saves the results

# from its 'fork' calls, so we can tell which leaf a given process is

# by looking at which forks returned zero and which returned a pid: a

# zero means to take the child's branch; a pid means to take the

# parent's branch.

# First set gdb to follow the child.

# The result should be that each of the 4 forks returns zero.

runto_main

gdb_test "set follow-fork child"

continue_to_exit_bp_loc

gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"

# Now set gdb to follow the parent.

# Result should be that none of the 4 forks returns zero.

runto_main

gdb_test "set follow-fork parent" "" ""

continue_to_exit_bp_loc

gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \

    " = 0" "follow parent, print pids"

#

# Now test with detach-on-fork off.

#

# detach-on-fork isn't implemented on hpux.

#

if {![istarget "*-*-linux*"]} then {

    continue

}

# Start with a fresh gdb

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

runto_main

gdb_breakpoint $exit_bp_loc

gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \

    "help set detach"

gdb_test "show detach-on-fork" "on." "show detach default on"

gdb_test "set detach off" "" "set detach off"

#

# We will now run every fork up to the exit bp,

# eventually winding up with 16 inferiors.

#

for {set i 1} {$i <= 15} {incr i} {

  gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"

  gdb_test "info inferior" " 5 .* 4 .* 3 .* 2 .*" "info inferior $i"

  gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \

      "inferior $i"

}

gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"

gdb_test "info inferiors" " 5 .* 4 .* 3 .* 2 .*" "info inferior 16"

gdb_test "inferior 2" " main .*" "restart final"

#

# Now we should examine all the pids.

#

#

# Test detach inferior

#

# [assumes we're at #1]

gdb_test "detach inferior 2" "Detaching .*" "Detach 2"

gdb_test "detach inferior 3" "Detaching .*" "Detach 3"

gdb_test "detach inferior 4" "Detaching .*" "Detach 4"

gdb_test "detach inferior 5" "Detaching .*" "Detach 5"

#

# Test kill inferior

#

gdb_test "kill inferior 6" "" "Kill 6"

gdb_test "info inferior 6" ".*" "Did kill 6"

gdb_test "kill inferior 7" "" "Kill 7"

gdb_test "info inferior 7" ".*" "Did kill 7"

gdb_test "kill inferior 8" "" "Kill 8"

gdb_test "info inferior 8" ".*" "Did kill 8"

gdb_test "kill inferior 9" "" "Kill 9"

gdb_test "info inferior 9" ".*" "Did kill 9"

gdb_test "kill inferior 10" "" "Kill 10"

gdb_test "info inferior 10" ".*" "Did kill 10"

gdb_test "kill inferior 11" "" "Kill 11"

gdb_test "info inferior 11" ".*" "Did kill 11"

gdb_test "kill inferior 12" "" "Kill 12"

gdb_test "info inferior 12" ".*" "Did kill 12"

gdb_test "kill inferior 13" "" "Kill 13"

gdb_test "info inferior 13" ".*" "Did kill 13"

gdb_test "kill inferior 14" "" "Kill 14"

gdb_test "info inferior 14" ".*" "Did kill 14"

gdb_test "kill inferior 15" "" "Kill 15"

gdb_test "info inferior 15" ".*" "Did kill 15"

gdb_test "kill inferior 16" "" "Kill 16"

gdb_test "info inferior 16" ".*" "Did kill 16"

return 0