| 1 | # Copyright 2005-2017 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 | # Until "set follow-fork-mode" and "catch fork" are implemented on |
| 17 | # other targets... |
| 18 | # |
| 19 | if { ![istarget "*-*-linux*"] } then { |
| 20 | continue |
| 21 | } |
| 22 | |
| 23 | |
| 24 | standard_testfile .c |
| 25 | |
| 26 | if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { |
| 27 | untested "failed to compile" |
| 28 | return -1 |
| 29 | } |
| 30 | |
| 31 | # Start with a fresh gdb |
| 32 | |
| 33 | clean_restart ${binfile} |
| 34 | |
| 35 | global gdb_prompt |
| 36 | |
| 37 | # This is a test of gdb's ability to follow the parent, child or both |
| 38 | # parent and child of multiple Unix fork() system calls. |
| 39 | |
| 40 | set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."] |
| 41 | |
| 42 | # Insert a breakpoint at the location provided by the exit_bp_loc global |
| 43 | # and resume the execution until hitting that breakpoint. We also make |
| 44 | # sure to consume all the expected output from all processes as well, |
| 45 | # to make sure it doesn't cause trouble during a subsequent test. |
| 46 | |
| 47 | proc continue_to_exit_bp_loc {} { |
| 48 | global exit_bp_loc decimal gdb_prompt |
| 49 | global inferior_spawn_id gdb_spawn_id |
| 50 | |
| 51 | gdb_breakpoint $exit_bp_loc |
| 52 | |
| 53 | send_gdb "continue\n" |
| 54 | |
| 55 | # The output from the child processes can be interleaved arbitrarily |
| 56 | # with the output from GDB and the parent process. If we don't |
| 57 | # consume it all now, it can confuse later interactions. |
| 58 | set seen_done 0 |
| 59 | set seen_break 0 |
| 60 | set seen_prompt 0 |
| 61 | set seen_timeout 0 |
| 62 | while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } { |
| 63 | # We don't know what order the interesting things will arrive in. |
| 64 | # Using a pattern of the form 'x|y|z' instead of -re x ... -re y |
| 65 | # ... -re z ensures that expect always chooses the match that |
| 66 | # occurs leftmost in the input, and not the pattern appearing |
| 67 | # first in the script that occurs anywhere in the input, so that |
| 68 | # we don't skip anything. |
| 69 | gdb_expect { |
| 70 | -i "$inferior_spawn_id $gdb_spawn_id" |
| 71 | -re "($decimal done)|(Breakpoint)|($gdb_prompt)" { |
| 72 | if {[info exists expect_out(1,string)]} { |
| 73 | incr seen_done |
| 74 | } elseif {[info exists expect_out(2,string)]} { |
| 75 | set seen_break 1 |
| 76 | } elseif {[info exists expect_out(3,string)]} { |
| 77 | set seen_prompt 1 |
| 78 | } |
| 79 | array unset expect_out |
| 80 | } |
| 81 | timeout { set seen_timeout 1 } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | if { $seen_timeout } { |
| 86 | fail "run to exit 2 (timeout)" |
| 87 | } elseif { ! $seen_prompt } { |
| 88 | fail "run to exit 2 (no prompt)" |
| 89 | } elseif { ! $seen_break } { |
| 90 | fail "run to exit 2 (no breakpoint hit)" |
| 91 | } elseif { $seen_done != 16 } { |
| 92 | fail "run to exit 2 (missing done messages)" |
| 93 | } else { |
| 94 | pass "run to exit 2" |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | # The inferior program builds a tree of processes by executing a loop |
| 99 | # four times, calling fork at each iteration. Thus, at each |
| 100 | # iteration, the total number of processes doubles; after four |
| 101 | # iterations, we have 16 processes. Each process saves the results |
| 102 | # from its 'fork' calls, so we can tell which leaf a given process is |
| 103 | # by looking at which forks returned zero and which returned a pid: a |
| 104 | # zero means to take the child's branch; a pid means to take the |
| 105 | # parent's branch. |
| 106 | |
| 107 | # First set gdb to follow the child. |
| 108 | # The result should be that each of the 4 forks returns zero. |
| 109 | |
| 110 | clean_restart ${binfile} |
| 111 | runto_main |
| 112 | gdb_test_no_output "set follow-fork child" |
| 113 | continue_to_exit_bp_loc |
| 114 | |
| 115 | gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids" |
| 116 | |
| 117 | # Now set gdb to follow the parent. |
| 118 | # Result should be that none of the 4 forks returns zero. |
| 119 | |
| 120 | clean_restart ${binfile} |
| 121 | runto_main |
| 122 | gdb_test_no_output "set follow-fork parent" "" |
| 123 | continue_to_exit_bp_loc |
| 124 | |
| 125 | gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \ |
| 126 | " = 0" "follow parent, print pids" |
| 127 | |
| 128 | # |
| 129 | # Now test with detach-on-fork off. |
| 130 | # |
| 131 | |
| 132 | # Start with a fresh gdb |
| 133 | |
| 134 | clean_restart ${binfile} |
| 135 | |
| 136 | runto_main |
| 137 | gdb_breakpoint $exit_bp_loc |
| 138 | |
| 139 | gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \ |
| 140 | "help set detach" |
| 141 | |
| 142 | gdb_test "show detach-on-fork" "on." "show detach default on" |
| 143 | |
| 144 | gdb_test_no_output "set detach off" "set detach off" |
| 145 | |
| 146 | # |
| 147 | # We will now run every fork up to the exit bp, |
| 148 | # eventually winding up with 16 inferiors. |
| 149 | # |
| 150 | |
| 151 | for {set i 1} {$i <= 15} {incr i} { |
| 152 | gdb_test "continue" "Breakpoint .* main .*exit.*" "run to exit $i" |
| 153 | gdb_test "info inferior" " 2 .* 3 .* 4 .* 5 .*" "info inferior $i" |
| 154 | gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \ |
| 155 | "inferior $i" |
| 156 | } |
| 157 | |
| 158 | gdb_test "continue" "Breakpoint .* main .*exit.*" "run to exit 16" |
| 159 | gdb_test "info inferior" " 2 .* 3 .* 4 .* 5 .*" "info inferior 16" |
| 160 | gdb_test "inferior 2" " main .*" "restart final" |
| 161 | |
| 162 | # |
| 163 | # Now we should examine all the pids. |
| 164 | # |
| 165 | |
| 166 | # |
| 167 | # Test detach inferior |
| 168 | # |
| 169 | |
| 170 | # [assumes we're at #1] |
| 171 | gdb_test "detach inferior 2" "Detaching .*" "detach 2" |
| 172 | gdb_test "detach inferior 3" "Detaching .*" "detach 3" |
| 173 | gdb_test "detach inferior 4" "Detaching .*" "detach 4" |
| 174 | gdb_test "detach inferior 5" "Detaching .*" "detach 5" |
| 175 | |
| 176 | # |
| 177 | # Test kill inferior |
| 178 | # |
| 179 | |
| 180 | for {set i 6} { $i <= 16} {incr i} { |
| 181 | gdb_test_no_output "kill inferior $i" "kill $i" |
| 182 | gdb_test "info inferior $i" "<null>.*" "did kill $i" |
| 183 | } |
| 184 | |
| 185 | return 0 |