gdb/testsuite/gdb.base/multi-forks.exp

   1 #   Copyright 2005, 2006, 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 $tracelevel then {
  18         strace $tracelevel
  19         }
  20
  21 if { [is_remote target] || ![isnative] } then {
  22     continue
  23 }
  24
  25 # Until "set follow-fork-mode" and "catch fork" are implemented on
  26 # other targets...
  27 #
  28 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then {
  29     continue
  30 }
  31
  32
  33 set testfile "multi-forks"
  34 set srcfile ${testfile}.c
  35 set binfile ${objdir}/${subdir}/${testfile}
  36
  37 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  38      untested multi-forks.exp
  39      return -1
  40 }
  41
  42 # Start with a fresh gdb
  43
  44 gdb_exit
  45 gdb_start
  46 gdb_reinitialize_dir $srcdir/$subdir
  47 gdb_load ${binfile}
  48
  49 global gdb_prompt
  50
  51 # This is a test of gdb's ability to follow the parent, child or both
  52 # parent and child of multiple Unix fork() system calls.
  53
  54 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
  55
  56 # Insert a breakpoint at the location provided by the exit_bp_loc global
  57 # and resume the execution until hitting that breakpoint.  We also make
  58 # sure to consume all the expected output from all processes as well,
  59 # to make sure it doesn't cause trouble during a subsequent test.
  60
  61 proc continue_to_exit_bp_loc {} {
  62     global exit_bp_loc decimal gdb_prompt
  63
  64     gdb_breakpoint $exit_bp_loc
  65
  66     send_gdb "continue\n"
  67
  68     # The output from the child processes can be interleaved arbitrarily
  69     # with the output from GDB and the parent process.  If we don't
  70     # consume it all now, it can confuse later interactions.
  71     set seen_done 0
  72     set seen_break 0
  73     set seen_prompt 0
  74     set seen_timeout 0
  75     while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
  76         # We don't know what order the interesting things will arrive in.
  77         # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
  78         # ... -re z ensures that expect always chooses the match that
  79         # occurs leftmost in the input, and not the pattern appearing
  80         # first in the script that occurs anywhere in the input, so that
  81         # we don't skip anything.
  82         gdb_expect {
  83             -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
  84                 if {[info exists expect_out(1,string)]} {
  85                     incr seen_done
  86                 } elseif {[info exists expect_out(2,string)]} {
  87                     set seen_break 1
  88                 } elseif {[info exists expect_out(3,string)]} {
  89                     set seen_prompt 1
  90                 }
  91                 array unset expect_out
  92             }
  93             timeout { set seen_timeout 1 }
  94         }
  95     }
  96
  97     if { $seen_timeout } {
  98         fail "run to exit 2 (timeout)"
  99     } elseif { ! $seen_prompt } {
 100         fail "run to exit 2 (no prompt)"
 101     } elseif { ! $seen_break } {
 102         fail "run to exit 2 (no breakpoint hit)"
 103     } elseif { $seen_done != 16 } {
 104         fail "run to exit 2 (missing done messages)"
 105     } else {
 106         pass "run to exit 2"
 107     }
 108 }
 109
 110 # The inferior program builds a tree of processes by executing a loop
 111 # four times, calling fork at each iteration.  Thus, at each
 112 # iteration, the total number of processes doubles; after four
 113 # iterations, we have 16 processes.  Each process saves the results
 114 # from its 'fork' calls, so we can tell which leaf a given process is
 115 # by looking at which forks returned zero and which returned a pid: a
 116 # zero means to take the child's branch; a pid means to take the
 117 # parent's branch.
 118
 119 # First set gdb to follow the child.
 120 # The result should be that each of the 4 forks returns zero.
 121
 122 runto_main
 123 gdb_test_no_output "set follow-fork child"
 124 continue_to_exit_bp_loc
 125
 126 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
 127
 128 # Now set gdb to follow the parent.
 129 # Result should be that none of the 4 forks returns zero.
 130
 131 runto_main
 132 gdb_test_no_output "set follow-fork parent" ""
 133 continue_to_exit_bp_loc
 134
 135 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
 136     " = 0" "follow parent, print pids"
 137
 138 #
 139 # Now test with detach-on-fork off.
 140 #
 141
 142 # detach-on-fork isn't implemented on hpux.
 143 #
 144 if {![istarget "*-*-linux*"]} then {
 145     continue
 146 }
 147
 148 # Start with a fresh gdb
 149
 150 gdb_exit
 151 gdb_start
 152 gdb_reinitialize_dir $srcdir/$subdir
 153 gdb_load ${binfile}
 154
 155 runto_main
 156 gdb_breakpoint $exit_bp_loc
 157
 158 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
 159     "help set detach"
 160
 161 gdb_test "show detach-on-fork" "on." "show detach default on"
 162
 163 gdb_test_no_output "set detach off" "set detach off"
 164
 165 #
 166 # We will now run every fork up to the exit bp,
 167 # eventually winding up with 16 inferiors.
 168 #
 169
 170 for {set i 1} {$i <= 15} {incr i} {
 171   gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"
 172   gdb_test "info inferior" " 5 .* 4 .* 3 .* 2 .*" "info inferior $i"
 173   gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \
 174       "inferior $i"
 175 }
 176
 177 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
 178 gdb_test "info inferiors" " 5 .* 4 .* 3 .* 2 .*" "info inferior 16"
 179 gdb_test "inferior 2" " main .*" "restart final"
 180
 181 #
 182 # Now we should examine all the pids.
 183 #
 184
 185 #
 186 # Test detach inferior
 187 #
 188
 189 # [assumes we're at #1]
 190 gdb_test "detach inferior 2" "Detaching .*" "Detach 2"
 191 gdb_test "detach inferior 3" "Detaching .*" "Detach 3"
 192 gdb_test "detach inferior 4" "Detaching .*" "Detach 4"
 193 gdb_test "detach inferior 5" "Detaching .*" "Detach 5"
 194
 195 #
 196 # Test kill inferior
 197 #
 198
 199 gdb_test_no_output "kill inferior 6" "Kill 6"
 200 gdb_test "info inferior 6" "<null>.*" "Did kill 6"
 201 gdb_test_no_output "kill inferior 7" "Kill 7"
 202 gdb_test "info inferior 7" "<null>.*" "Did kill 7"
 203 gdb_test_no_output "kill inferior 8" "Kill 8"
 204 gdb_test "info inferior 8" "<null>.*" "Did kill 8"
 205 gdb_test_no_output "kill inferior 9" "Kill 9"
 206 gdb_test "info inferior 9" "<null>.*" "Did kill 9"
 207 gdb_test_no_output "kill inferior 10" "Kill 10"
 208 gdb_test "info inferior 10" "<null>.*" "Did kill 10"
 209 gdb_test_no_output "kill inferior 11" "Kill 11"
 210 gdb_test "info inferior 11" "<null>.*" "Did kill 11"
 211 gdb_test_no_output "kill inferior 12" "Kill 12"
 212 gdb_test "info inferior 12" "<null>.*" "Did kill 12"
 213 gdb_test_no_output "kill inferior 13" "Kill 13"
 214 gdb_test "info inferior 13" "<null>.*" "Did kill 13"
 215 gdb_test_no_output "kill inferior 14" "Kill 14"
 216 gdb_test "info inferior 14" "<null>.*" "Did kill 14"
 217 gdb_test_no_output "kill inferior 15" "Kill 15"
 218 gdb_test "info inferior 15" "<null>.*" "Did kill 15"
 219 gdb_test_no_output "kill inferior 16" "Kill 16"
 220 gdb_test "info inferior 16" "<null>.*" "Did kill 16"
 221
 222 return 0