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

   1 #   Copyright 2005, 2006, 2007, 2008, 2009 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 set prms_id 0
  32 set bug_id 0
  33
  34 set testfile "multi-forks"
  35 set srcfile ${testfile}.c
  36 set binfile ${objdir}/${subdir}/${testfile}
  37
  38 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  39      untested multi-forks.exp
  40      return -1
  41 }
  42
  43 # Start with a fresh gdb
  44
  45 gdb_exit
  46 gdb_start
  47 gdb_reinitialize_dir $srcdir/$subdir
  48 gdb_load ${binfile}
  49
  50 global gdb_prompt
  51
  52 # This is a test of gdb's ability to follow the parent, child or both
  53 # parent and child of multiple Unix fork() system calls.
  54
  55 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
  56
  57 # Insert a breakpoint at the location provided by the exit_bp_loc global
  58 # and resume the execution until hitting that breakpoint.  We also make
  59 # sure to consume all the expected output from all processes as well,
  60 # to make sure it doesn't cause trouble during a subsequent test.
  61
  62 proc continue_to_exit_bp_loc {} {
  63     global exit_bp_loc decimal gdb_prompt
  64
  65     gdb_breakpoint $exit_bp_loc
  66
  67     send_gdb "continue\n"
  68
  69     # The output from the child processes can be interleaved arbitrarily
  70     # with the output from GDB and the parent process.  If we don't
  71     # consume it all now, it can confuse later interactions.
  72     set seen_done 0
  73     set seen_break 0
  74     set seen_prompt 0
  75     set seen_timeout 0
  76     while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
  77         # We don't know what order the interesting things will arrive in.
  78         # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
  79         # ... -re z ensures that expect always chooses the match that
  80         # occurs leftmost in the input, and not the pattern appearing
  81         # first in the script that occurs anywhere in the input, so that
  82         # we don't skip anything.
  83         gdb_expect {
  84             -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
  85                 if {[info exists expect_out(1,string)]} {
  86                     incr seen_done
  87                 } elseif {[info exists expect_out(2,string)]} {
  88                     set seen_break 1
  89                 } elseif {[info exists expect_out(3,string)]} {
  90                     set seen_prompt 1
  91                 }
  92                 array unset expect_out
  93             }
  94             timeout { set seen_timeout 1 }
  95         }
  96     }
  97
  98     if { $seen_timeout } {
  99         fail "run to exit 2 (timeout)"
 100     } elseif { ! $seen_prompt } {
 101         fail "run to exit 2 (no prompt)"
 102     } elseif { ! $seen_break } {
 103         fail "run to exit 2 (no breakpoint hit)"
 104     } elseif { $seen_done != 16 } {
 105         fail "run to exit 2 (missing done messages)"
 106     } else {
 107         pass "run to exit 2"
 108     }
 109 }
 110
 111 # The inferior program builds a tree of processes by executing a loop
 112 # four times, calling fork at each iteration.  Thus, at each
 113 # iteration, the total number of processes doubles; after four
 114 # iterations, we have 16 processes.  Each process saves the results
 115 # from its 'fork' calls, so we can tell which leaf a given process is
 116 # by looking at which forks returned zero and which returned a pid: a
 117 # zero means to take the child's branch; a pid means to take the
 118 # parent's branch.
 119
 120 # First set gdb to follow the child.
 121 # The result should be that each of the 4 forks returns zero.
 122
 123 runto_main
 124 gdb_test "set follow child"
 125 continue_to_exit_bp_loc
 126
 127 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
 128
 129 # Now set gdb to follow the parent.
 130 # Result should be that none of the 4 forks returns zero.
 131
 132 runto_main
 133 gdb_test "set follow parent" "" ""
 134 continue_to_exit_bp_loc
 135
 136 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
 137     " = 0" "follow parent, print pids"
 138
 139 #
 140 # Now test with detach-on-fork off.
 141 #
 142
 143 # detach-on-fork isn't implemented on hpux.
 144 #
 145 if {![istarget "*-*-linux*"]} then {
 146     continue
 147 }
 148
 149 # Start with a fresh gdb
 150
 151 gdb_exit
 152 gdb_start
 153 gdb_reinitialize_dir $srcdir/$subdir
 154 gdb_load ${binfile}
 155
 156 runto_main
 157 gdb_breakpoint $exit_bp_loc
 158
 159 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
 160     "help set detach"
 161
 162 gdb_test "show detach-on-fork" "on." "show detach default on"
 163
 164 gdb_test "set detach off" "" "set detach off"
 165
 166 #
 167 # We will now run every fork up to the exit bp,
 168 # eventually winding up with 16 inferiors.
 169 #
 170
 171 for {set i 1} {$i <= 15} {incr i} {
 172   gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"
 173   gdb_test "info inferior" " 5 .* 4 .* 3 .* 2 .*" "info inferior $i"
 174   gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \
 175       "inferior $i"
 176 }
 177
 178 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
 179 gdb_test "info inferiors" " 5 .* 4 .* 3 .* 2 .*" "info inferior 16"
 180 gdb_test "inferior 2" " main .*" "restart final"
 181
 182 #
 183 # Now we should examine all the pids.
 184 #
 185
 186 #
 187 # Test detach inferior
 188 #
 189
 190 # [assumes we're at #1]
 191 gdb_test "detach inferior 2" "Detaching .*" "Detach 2"
 192 gdb_test "detach inferior 3" "Detaching .*" "Detach 3"
 193 gdb_test "detach inferior 4" "Detaching .*" "Detach 4"
 194 gdb_test "detach inferior 5" "Detaching .*" "Detach 5"
 195
 196 #
 197 # Test kill inferior
 198 #
 199
 200 gdb_test "kill inferior 6" "" "Kill 6"
 201 gdb_test "info inferior 6" "Inferior ID 6 not known." "Did kill 6"
 202 gdb_test "kill inferior 7" "" "Kill 7"
 203 gdb_test "info inferior 7" "Inferior ID 7 not known." "Did kill 7"
 204 gdb_test "kill inferior 8" "" "Kill 8"
 205 gdb_test "info inferior 8" "Inferior ID 8 not known." "Did kill 8"
 206 gdb_test "kill inferior 9" "" "Kill 9"
 207 gdb_test "info inferior 9" "Inferior ID 9 not known." "Did kill 9"
 208 gdb_test "kill inferior 10" "" "Kill 10"
 209 gdb_test "info inferior 10" "Inferior ID 10 not known." "Did kill 10"
 210 gdb_test "kill inferior 11" "" "Kill 11"
 211 gdb_test "info inferior 11" "Inferior ID 11 not known." "Did kill 11"
 212 gdb_test "kill inferior 12" "" "Kill 12"
 213 gdb_test "info inferior 12" "Inferior ID 12 not known." "Did kill 12"
 214 gdb_test "kill inferior 13" "" "Kill 13"
 215 gdb_test "info inferior 13" "Inferior ID 13 not known." "Did kill 13"
 216 gdb_test "kill inferior 14" "" "Kill 14"
 217 gdb_test "info inferior 14" "Inferior ID 14 not known." "Did kill 14"
 218 gdb_test "kill inferior 15" "" "Kill 15"
 219 gdb_test "info inferior 15" "Inferior ID 15 not known." "Did kill 15"
 220 gdb_test "kill inferior 16" "" "Kill 16"
 221 gdb_test "info inferior 16" "Inferior ID 16 not known." "Did kill 16"
 222
 223 return 0