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

   1 #   Copyright 2005-2012 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 if $tracelevel then {
  17         strace $tracelevel
  18         }
  19
  20 if { [is_remote target] || ![isnative] } then {
  21     continue
  22 }
  23
  24 # Until "set follow-fork-mode" and "catch fork" are implemented on
  25 # other targets...
  26 #
  27 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then {
  28     continue
  29 }
  30
  31
  32 set testfile "multi-forks"
  33 set srcfile ${testfile}.c
  34 set binfile ${objdir}/${subdir}/${testfile}
  35
  36 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  37      untested multi-forks.exp
  38      return -1
  39 }
  40
  41 # Start with a fresh gdb
  42
  43 gdb_exit
  44 gdb_start
  45 gdb_reinitialize_dir $srcdir/$subdir
  46 gdb_load ${binfile}
  47
  48 global gdb_prompt
  49
  50 # This is a test of gdb's ability to follow the parent, child or both
  51 # parent and child of multiple Unix fork() system calls.
  52
  53 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
  54
  55 # Insert a breakpoint at the location provided by the exit_bp_loc global
  56 # and resume the execution until hitting that breakpoint.  We also make
  57 # sure to consume all the expected output from all processes as well,
  58 # to make sure it doesn't cause trouble during a subsequent test.
  59
  60 proc continue_to_exit_bp_loc {} {
  61     global exit_bp_loc decimal gdb_prompt
  62
  63     gdb_breakpoint $exit_bp_loc
  64
  65     send_gdb "continue\n"
  66
  67     # The output from the child processes can be interleaved arbitrarily
  68     # with the output from GDB and the parent process.  If we don't
  69     # consume it all now, it can confuse later interactions.
  70     set seen_done 0
  71     set seen_break 0
  72     set seen_prompt 0
  73     set seen_timeout 0
  74     while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
  75         # We don't know what order the interesting things will arrive in.
  76         # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
  77         # ... -re z ensures that expect always chooses the match that
  78         # occurs leftmost in the input, and not the pattern appearing
  79         # first in the script that occurs anywhere in the input, so that
  80         # we don't skip anything.
  81         gdb_expect {
  82             -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
  83                 if {[info exists expect_out(1,string)]} {
  84                     incr seen_done
  85                 } elseif {[info exists expect_out(2,string)]} {
  86                     set seen_break 1
  87                 } elseif {[info exists expect_out(3,string)]} {
  88                     set seen_prompt 1
  89                 }
  90                 array unset expect_out
  91             }
  92             timeout { set seen_timeout 1 }
  93         }
  94     }
  95
  96     if { $seen_timeout } {
  97         fail "run to exit 2 (timeout)"
  98     } elseif { ! $seen_prompt } {
  99         fail "run to exit 2 (no prompt)"
 100     } elseif { ! $seen_break } {
 101         fail "run to exit 2 (no breakpoint hit)"
 102     } elseif { $seen_done != 16 } {
 103         fail "run to exit 2 (missing done messages)"
 104     } else {
 105         pass "run to exit 2"
 106     }
 107 }
 108
 109 # The inferior program builds a tree of processes by executing a loop
 110 # four times, calling fork at each iteration.  Thus, at each
 111 # iteration, the total number of processes doubles; after four
 112 # iterations, we have 16 processes.  Each process saves the results
 113 # from its 'fork' calls, so we can tell which leaf a given process is
 114 # by looking at which forks returned zero and which returned a pid: a
 115 # zero means to take the child's branch; a pid means to take the
 116 # parent's branch.
 117
 118 # First set gdb to follow the child.
 119 # The result should be that each of the 4 forks returns zero.
 120
 121 runto_main
 122 gdb_test_no_output "set follow-fork child"
 123 continue_to_exit_bp_loc
 124
 125 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
 126
 127 # Now set gdb to follow the parent.
 128 # Result should be that none of the 4 forks returns zero.
 129
 130 runto_main
 131 gdb_test_no_output "set follow-fork parent" ""
 132 continue_to_exit_bp_loc
 133
 134 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
 135     " = 0" "follow parent, print pids"
 136
 137 #
 138 # Now test with detach-on-fork off.
 139 #
 140
 141 # detach-on-fork isn't implemented on hpux.
 142 #
 143 if {![istarget "*-*-linux*"]} then {
 144     continue
 145 }
 146
 147 # Start with a fresh gdb
 148
 149 gdb_exit
 150 gdb_start
 151 gdb_reinitialize_dir $srcdir/$subdir
 152 gdb_load ${binfile}
 153
 154 runto_main
 155 gdb_breakpoint $exit_bp_loc
 156
 157 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
 158     "help set detach"
 159
 160 gdb_test "show detach-on-fork" "on." "show detach default on"
 161
 162 gdb_test_no_output "set detach off" "set detach off"
 163
 164 #
 165 # We will now run every fork up to the exit bp,
 166 # eventually winding up with 16 inferiors.
 167 #
 168
 169 for {set i 1} {$i <= 15} {incr i} {
 170   gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"
 171   gdb_test "info inferior" " 5 .* 4 .* 3 .* 2 .*" "info inferior $i"
 172   gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \
 173       "inferior $i"
 174 }
 175
 176 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
 177 gdb_test "info inferiors" " 5 .* 4 .* 3 .* 2 .*" "info inferior 16"
 178 gdb_test "inferior 2" " main .*" "restart final"
 179
 180 #
 181 # Now we should examine all the pids.
 182 #
 183
 184 #
 185 # Test detach inferior
 186 #
 187
 188 # [assumes we're at #1]
 189 gdb_test "detach inferior 2" "Detaching .*" "Detach 2"
 190 gdb_test "detach inferior 3" "Detaching .*" "Detach 3"
 191 gdb_test "detach inferior 4" "Detaching .*" "Detach 4"
 192 gdb_test "detach inferior 5" "Detaching .*" "Detach 5"
 193
 194 #
 195 # Test kill inferior
 196 #
 197
 198 gdb_test_no_output "kill inferior 6" "Kill 6"
 199 gdb_test "info inferior 6" "<null>.*" "Did kill 6"
 200 gdb_test_no_output "kill inferior 7" "Kill 7"
 201 gdb_test "info inferior 7" "<null>.*" "Did kill 7"
 202 gdb_test_no_output "kill inferior 8" "Kill 8"
 203 gdb_test "info inferior 8" "<null>.*" "Did kill 8"
 204 gdb_test_no_output "kill inferior 9" "Kill 9"
 205 gdb_test "info inferior 9" "<null>.*" "Did kill 9"
 206 gdb_test_no_output "kill inferior 10" "Kill 10"
 207 gdb_test "info inferior 10" "<null>.*" "Did kill 10"
 208 gdb_test_no_output "kill inferior 11" "Kill 11"
 209 gdb_test "info inferior 11" "<null>.*" "Did kill 11"
 210 gdb_test_no_output "kill inferior 12" "Kill 12"
 211 gdb_test "info inferior 12" "<null>.*" "Did kill 12"
 212 gdb_test_no_output "kill inferior 13" "Kill 13"
 213 gdb_test "info inferior 13" "<null>.*" "Did kill 13"
 214 gdb_test_no_output "kill inferior 14" "Kill 14"
 215 gdb_test "info inferior 14" "<null>.*" "Did kill 14"
 216 gdb_test_no_output "kill inferior 15" "Kill 15"
 217 gdb_test "info inferior 15" "<null>.*" "Did kill 15"
 218 gdb_test_no_output "kill inferior 16" "Kill 16"
 219 gdb_test "info inferior 16" "<null>.*" "Did kill 16"
 220
 221 return 0