1 # Copyright 2005, 2006, 2007, 2008, 2009 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.
55 set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
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.
62 proc continue_to_exit_bp_loc {} {
63 global exit_bp_loc decimal gdb_prompt
65 gdb_breakpoint $exit_bp_loc
69 # The output from the child processes can be interleaved arbitrarily
70 # with the output from GDB and the parent process. If we don't
71 # consume it all now, it can confuse later interactions.
76 while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } {
77 # We don't know what order the interesting things will arrive in.
78 # Using a pattern of the form 'x|y|z' instead of -re x ... -re y
79 # ... -re z ensures that expect always chooses the match that
80 # occurs leftmost in the input, and not the pattern appearing
81 # first in the script that occurs anywhere in the input, so that
82 # we don't skip anything.
84 -re "($decimal done)|(Breakpoint)|($gdb_prompt)" {
85 if {[info exists expect_out(1,string)]} {
87 } elseif {[info exists expect_out(2,string)]} {
89 } elseif {[info exists expect_out(3,string)]} {
92 array unset expect_out
94 timeout { set seen_timeout 1 }
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 { $seen_done != 16 } {
105 fail "run to exit 2 (missing done messages)"
111 # The inferior program builds a tree of processes by executing a loop
112 # four times, calling fork at each iteration. Thus, at each
113 # iteration, the total number of processes doubles; after four
114 # iterations, we have 16 processes. Each process saves the results
115 # from its 'fork' calls, so we can tell which leaf a given process is
116 # by looking at which forks returned zero and which returned a pid: a
117 # zero means to take the child's branch; a pid means to take the
120 # First set gdb to follow the child.
121 # The result should be that each of the 4 forks returns zero.
124 gdb_test "set follow child"
125 continue_to_exit_bp_loc
127 gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
129 # Now set gdb to follow the parent.
130 # Result should be that none of the 4 forks returns zero.
133 gdb_test "set follow parent" "" ""
134 continue_to_exit_bp_loc
136 gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
137 " = 0" "follow parent, print pids"
140 # Now test with detach-on-fork off.
144 gdb_breakpoint $exit_bp_loc
146 gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
149 gdb_test "show detach-on-fork" "on." "show detach default on"
151 gdb_test "set detach off" "" "set detach off"
154 # We will now run every fork up to the exit bp,
155 # eventually winding up with 16 forks.
158 for {set i 1} {$i <= 15} {incr i} {
159 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i"
160 gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork $i"
161 gdb_test "restart $i" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \
165 gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
166 gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 16"
167 gdb_test "restart 0" " main .*" "restart final"
170 # Now we should examine all the pids.
177 # [assumes we're at #0]
178 gdb_test "detach fork 1" "Detached .*" "Detach 1"
179 gdb_test "detach fork 2" "Detached .*" "Detach 2"
180 gdb_test "detach fork 3" "Detached .*" "Detach 3"
181 gdb_test "detach fork 4" "Detached .*" "Detach 4"
187 gdb_test "delete fork 5" "" "Delete 5"
188 gdb_test "info fork 5" "No fork number 5." "Did delete 5"
189 gdb_test "delete fork 6" "" "Delete 6"
190 gdb_test "info fork 6" "No fork number 6." "Did delete 6"
191 gdb_test "delete fork 7" "" "Delete 7"
192 gdb_test "info fork 7" "No fork number 7." "Did delete 7"
193 gdb_test "delete fork 8" "" "Delete 8"
194 gdb_test "info fork 8" "No fork number 8." "Did delete 8"
195 gdb_test "delete fork 9" "" "Delete 9"
196 gdb_test "info fork 9" "No fork number 9." "Did delete 9"
197 gdb_test "delete fork 10" "" "Delete 10"
198 gdb_test "info fork 10" "No fork number 10." "Did delete 10"
199 gdb_test "delete fork 11" "" "Delete 11"
200 gdb_test "info fork 11" "No fork number 11." "Did delete 11"
201 gdb_test "delete fork 12" "" "Delete 12"
202 gdb_test "info fork 12" "No fork number 12." "Did delete 12"
203 gdb_test "delete fork 13" "" "Delete 13"
204 gdb_test "info fork 13" "No fork number 13." "Did delete 13"
205 gdb_test "delete fork 14" "" "Delete 14"
206 gdb_test "info fork 14" "No fork number 14." "Did delete 14"
207 gdb_test "delete fork 15" "" "Delete 15"
208 gdb_test "info fork 15" "No fork number 15." "Did delete 15"