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

   1 #   Copyright 2005, 2006, 2007, 2008 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
  56 # The inferior program builds a tree of processes by executing a loop
  57 # four times, calling fork at each iteration.  Thus, at each
  58 # iteration, the total number of processes doubles; after four
  59 # iterations, we have 16 processes.  Each process saves the results
  60 # from its 'fork' calls, so we can tell which leaf a given process is
  61 # by looking at which forks returned zero and which returned a pid: a
  62 # zero means to take the child's branch; a pid means to take the
  63 # parent's branch.
  64
  65 # First set gdb to follow the child.
  66 # The result should be that each of the 4 forks returns zero.
  67
  68 runto_main
  69 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
  70 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
  71 gdb_test "set follow child" "" ""
  72
  73 send_gdb "continue\n"
  74 gdb_expect {
  75     -re ".*Break.* main .*$gdb_prompt.*$" {}
  76     -re ".*$gdb_prompt $" {fail "run to exit 1"}
  77     default {fail "run to exit 1 (timeout)"}
  78 }
  79
  80 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
  81
  82 # Now set gdb to follow the parent.
  83 # Result should be that none of the 4 forks returns zero.
  84
  85 delete_breakpoints
  86 runto_main
  87 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
  88 gdb_test "set follow parent" "" ""
  89
  90 send_gdb "continue\n"
  91
  92 # The output from the child processes can be interleaved arbitrarily
  93 # with the output from GDB and the parent process.  If we don't
  94 # consume it all now, it can confuse later interactions.
  95 set seen_done 0
  96 set seen_break 0
  97 set seen_prompt 0
  98 set seen_timeout 0
  99 while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
 100     # We don't know what order the interesting things will arrive in.
 101     # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
 102     # ... -re z ensures that expect always chooses the match that
 103     # occurs leftmost in the input, and not the pattern appearing
 104     # first in the script that occurs anywhere in the input, so that
 105     # we don't skip anything.
 106     gdb_expect {
 107         -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
 108             if {[info exists expect_out(1,string)]} {
 109                 incr seen_done
 110             } elseif {[info exists expect_out(2,string)]} {
 111                 set seen_break 1
 112             } elseif {[info exists expect_out(3,string)]} {
 113                 set seen_prompt 1
 114             }
 115             array unset expect_out
 116         }
 117         timeout { set seen_timeout 1 }
 118     }
 119 }
 120
 121 if { $seen_timeout } {
 122     fail "run to exit 2 (timeout)"
 123 } elseif { ! $seen_prompt } {
 124     fail "run to exit 2 (no prompt)"
 125 } elseif { ! $seen_break } {
 126     fail "run to exit 2 (no breakpoint hit)"
 127 } elseif { $seen_done != 16 } {
 128     fail "run to exit 2 (missing done messages)"
 129 } else {
 130     pass "run to exit 2"
 131 }
 132
 133 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
 134     " = 0" "follow parent, print pids"
 135
 136 #
 137 # Now test with detach-on-fork off.
 138 #
 139
 140 runto_main
 141 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" ""
 142
 143 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
 144     "help set detach"
 145
 146 gdb_test "show detach-on-fork" "on." "show detach default on"
 147
 148 gdb_test "set detach off" "" "set detach off"
 149
 150 #
 151 # We will now run every fork up to the exit bp,
 152 # eventually winding up with 16 forks.
 153 #
 154
 155 for {set i 1} {$i <= 15} {incr i} {
 156   gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"
 157   gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork $i"
 158   gdb_test "restart $i" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \
 159       "restart $i"
 160 }
 161
 162 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
 163 gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 16"
 164 gdb_test "restart 0" " main .*" "restart final"
 165
 166 #
 167 # Now we should examine all the pids.
 168 #
 169
 170 #
 171 # Test detach fork
 172 #
 173
 174 # [assumes we're at #0]
 175 gdb_test "detach fork 1" "Detached .*" "Detach 1"
 176 gdb_test "detach fork 2" "Detached .*" "Detach 2"
 177 gdb_test "detach fork 3" "Detached .*" "Detach 3"
 178 gdb_test "detach fork 4" "Detached .*" "Detach 4"
 179
 180 #
 181 # Test delete fork
 182 #
 183
 184 gdb_test "delete fork 5" "" "Delete 5"
 185 gdb_test "info fork 5"   "No fork number 5." "Did delete 5"
 186 gdb_test "delete fork 6" "" "Delete 6"
 187 gdb_test "info fork 6"   "No fork number 6." "Did delete 6"
 188 gdb_test "delete fork 7" "" "Delete 7"
 189 gdb_test "info fork 7"   "No fork number 7." "Did delete 7"
 190 gdb_test "delete fork 8" "" "Delete 8"
 191 gdb_test "info fork 8"   "No fork number 8." "Did delete 8"
 192 gdb_test "delete fork 9" "" "Delete 9"
 193 gdb_test "info fork 9"   "No fork number 9." "Did delete 9"
 194 gdb_test "delete fork 10" "" "Delete 10"
 195 gdb_test "info fork 10"   "No fork number 10." "Did delete 10"
 196 gdb_test "delete fork 11" "" "Delete 11"
 197 gdb_test "info fork 11"   "No fork number 11." "Did delete 11"
 198 gdb_test "delete fork 12" "" "Delete 12"
 199 gdb_test "info fork 12"   "No fork number 12." "Did delete 12"
 200 gdb_test "delete fork 13" "" "Delete 13"
 201 gdb_test "info fork 13"   "No fork number 13." "Did delete 13"
 202 gdb_test "delete fork 14" "" "Delete 14"
 203 gdb_test "info fork 14"   "No fork number 14." "Did delete 14"
 204 gdb_test "delete fork 15" "" "Delete 15"
 205 gdb_test "info fork 15"   "No fork number 15." "Did delete 15"
 206
 207 return 0
 208