1 # Copyright 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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.
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.
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/>.
20 if { [is_remote target] || ![isnative] } then {
24 # Until "set follow-fork-mode" and "catch fork" are implemented on
27 if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then {
34 set testfile "multi-forks"
35 set srcfile ${testfile}.c
36 set binfile ${objdir}/${subdir}/${testfile}
38 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
39 untested multi-forks.exp
43 # Start with a fresh gdb
47 gdb_reinitialize_dir $srcdir/$subdir
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.
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
65 # First set gdb to follow the child.
66 # The result should be that each of the 4 forks returns zero.
69 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
70 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
71 gdb_test "set follow child" "" ""
75 -re ".*Break.* main .*$gdb_prompt.*$" {}
76 -re ".*$gdb_prompt $" {fail "run to exit 1"}
77 default {fail "run to exit 1 (timeout)"}
80 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
82 # Now set gdb to follow the parent.
83 # Result should be that none of the 4 forks returns zero.
87 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
88 gdb_test "set follow parent" "" ""
92 # The output from the child processes can be interleaved arbitrarily
93 # with the output from GDB and the parent process. If we don't
94 # consume it all now, it can confuse later interactions.
99 while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
100 # We don't know what order the interesting things will arrive in.
101 # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
102 # ... -re z ensures that expect always chooses the match that
103 # occurs leftmost in the input, and not the pattern appearing
104 # first in the script that occurs anywhere in the input, so that
105 # we don't skip anything.
107 -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
108 if {[info exists expect_out(1,string)]} {
110 } elseif {[info exists expect_out(2,string)]} {
112 } elseif {[info exists expect_out(3,string)]} {
115 array unset expect_out
117 timeout { set seen_timeout 1 }
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)"
133 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
134 " = 0" "follow parent, print pids"
137 # Now test with detach-on-fork off.
141 gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" ""
143 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
146 gdb_test "show detach-on-fork" "on." "show detach default on"
148 gdb_test "set detach off" "" "set detach off"
151 # We will now run every fork up to the exit bp,
152 # eventually winding up with 16 forks.
155 for {set i 1} {$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).*" \
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"
167 # Now we should examine all the pids.
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"
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"