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