Subversion Repositories scarts

#   Copyright 2005, 2006, 2007, 2008 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.

#

# 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

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

gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"

gdb_test "set follow child" "" ""

send_gdb "continue\n"

gdb_expect {

    -re ".*Break.* main .*$gdb_prompt.*$" {}

    -re ".*$gdb_prompt $" {fail "run to exit 1"}

    default {fail "run to exit 1 (timeout)"}

}

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.

delete_breakpoints

runto_main

gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"

gdb_test "set follow parent" "" ""

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"

}

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.

#

runto_main

gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" ""

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 forks.

#

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

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

  gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork $i"

  gdb_test "restart $i" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \

      "restart $i"

}

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

gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 16"

gdb_test "restart 0" " main .*" "restart final"

#

# Now we should examine all the pids.

#

#

# Test detach fork

#

# [assumes we're at #0]

gdb_test "detach fork 1" "Detached .*" "Detach 1"

gdb_test "detach fork 2" "Detached .*" "Detach 2"

gdb_test "detach fork 3" "Detached .*" "Detach 3"

gdb_test "detach fork 4" "Detached .*" "Detach 4"

#

# Test delete fork

#

gdb_test "delete fork 5" "" "Delete 5"

gdb_test "info fork 5"   "No fork number 5." "Did delete 5"

gdb_test "delete fork 6" "" "Delete 6"

gdb_test "info fork 6"   "No fork number 6." "Did delete 6"

gdb_test "delete fork 7" "" "Delete 7"

gdb_test "info fork 7"   "No fork number 7." "Did delete 7"

gdb_test "delete fork 8" "" "Delete 8"

gdb_test "info fork 8"   "No fork number 8." "Did delete 8"

gdb_test "delete fork 9" "" "Delete 9"

gdb_test "info fork 9"   "No fork number 9." "Did delete 9"

gdb_test "delete fork 10" "" "Delete 10"

gdb_test "info fork 10"   "No fork number 10." "Did delete 10"

gdb_test "delete fork 11" "" "Delete 11"

gdb_test "info fork 11"   "No fork number 11." "Did delete 11"

gdb_test "delete fork 12" "" "Delete 12"

gdb_test "info fork 12"   "No fork number 12." "Did delete 12"

gdb_test "delete fork 13" "" "Delete 13"

gdb_test "info fork 13"   "No fork number 13." "Did delete 13"

gdb_test "delete fork 14" "" "Delete 14"

gdb_test "info fork 14"   "No fork number 14." "Did delete 14"

gdb_test "delete fork 15" "" "Delete 15"

gdb_test "info fork 15"   "No fork number 15." "Did delete 15"

return 0