binutils-gdb/gdb/testsuite/gdb.base/foll-fork.exp

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# Copyright 1997-2014 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
if { [is_remote target] || ![isnative] } then {
continue
}
# Until "set follow-fork-mode" and "catch fork" are implemented on
# other targets...
#
if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
continue
}
standard_testfile
if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
untested $testfile.exp
return -1
}
proc check_fork_catchpoints {} {
global gdb_prompt
# Verify that the system supports "catch fork".
gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" "insert first fork catchpoint"
set has_fork_catchpoints 0
gdb_test_multiple "continue" "continue to first fork catchpoint" {
-re ".*Your system does not support this type\r\nof catchpoint.*$gdb_prompt $" {
unsupported "continue to first fork catchpoint"
}
-re ".*Catchpoint.*$gdb_prompt $" {
set has_fork_catchpoints 1
pass "continue to first fork catchpoint"
}
}
if {$has_fork_catchpoints == 0} {
unsupported "fork catchpoints"
return -code return
}
}
proc default_fork_parent_follow {} {
global gdb_prompt
gdb_test "show follow-fork" \
"Debugger response to a program call of fork or vfork is \"parent\".*" \
"default show parent follow, no catchpoints"
gdb_test "next 2" \
"Detaching after fork from.*" \
"default parent follow, no catchpoints"
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}
proc explicit_fork_parent_follow {} {
global gdb_prompt
gdb_test_no_output "set follow-fork parent"
gdb_test "show follow-fork" \
"Debugger response to a program call of fork or vfork is \"parent\"." \
"explicit show parent follow, no catchpoints"
gdb_test "next 2" "Detaching after fork from.*" \
"explicit parent follow, no catchpoints"
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
}
proc explicit_fork_child_follow {} {
global gdb_prompt
gdb_test_no_output "set follow-fork child"
gdb_test "show follow-fork" \
"Debugger response to a program call of fork or vfork is \"child\"." \
"explicit show child follow, no catchpoints"
gdb_test "next 2" "Attaching after.* fork to.*" \
"explicit child follow, no catchpoints"
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any gdb_expected debugger output from a subsequent testpoint.
#
exec sleep 1
}
proc catch_fork_child_follow {} {
global gdb_prompt
global srcfile
set bp_after_fork [gdb_get_line_number "set breakpoint here"]
gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
"explicit child follow, set catch fork"
# Verify that the catchpoint is mentioned in an "info breakpoints",
# and further that the catchpoint mentions no process id.
#
set test_name "info shows catchpoint without pid"
gdb_test_multiple "info breakpoints" "$test_name" {
-re ".*catchpoint.*keep y.*fork\[\r\n\]+$gdb_prompt $" {
pass "$test_name"
}
}
gdb_test "continue" \
"Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
"explicit child follow, catch fork"
# Verify that the catchpoint is mentioned in an "info breakpoints",
# and further that the catchpoint managed to capture a process id.
#
set test_name "info shows catchpoint without pid"
gdb_test_multiple "info breakpoints" "$test_name" {
-re ".*catchpoint.*keep y.*fork, process.*$gdb_prompt $" {
pass "$test_name"
}
}
gdb_test_no_output "set follow-fork child"
gdb_test "tbreak ${srcfile}:$bp_after_fork" \
"Temporary breakpoint.*, line $bp_after_fork.*" \
"set follow-fork child, tbreak"
gdb_test "continue" \
"Attaching after.* fork to.* at .*$bp_after_fork.*" \
"set follow-fork child, hit tbreak"
# The parent has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
gdb_test "delete breakpoints" \
"" \
"set follow-fork child, cleanup" \
"Delete all breakpoints. \\(y or n\\) $" \
"y"
}
proc catch_fork_unpatch_child {} {
global gdb_prompt
global srcfile
set bp_exit [gdb_get_line_number "at exit"]
gdb_test "break callee" "file .*$srcfile, line .*" \
"unpatch child, break at callee"
gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
"unpatch child, set catch fork"
gdb_test "continue" \
"Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
"unpatch child, catch fork"
# Delete all breakpoints and catchpoints.
delete_breakpoints
# Force $srcfile as the current GDB source can be in glibc sourcetree.
gdb_test "break $srcfile:$bp_exit" \
"Breakpoint .*file .*$srcfile, line .*" \
"unpatch child, breakpoint at exit call"
gdb_test_no_output "set follow-fork child" \
"unpatch child, set follow-fork child"
set test "unpatch child, unpatched parent breakpoints from child"
gdb_test_multiple "continue" $test {
-re "at exit.*$gdb_prompt $" {
pass "$test"
}
-re "SIGTRAP.*$gdb_prompt $" {
fail "$test"
# Explicitly kill this child, so we can continue gracefully
# with further testing...
send_gdb "kill\n"
gdb_expect {
-re ".*Kill the program being debugged.*y or n. $" {
send_gdb "y\n"
gdb_expect -re "$gdb_prompt $" {}
}
}
}
}
}
proc tcatch_fork_parent_follow {} {
global gdb_prompt
global srcfile
set bp_after_fork [gdb_get_line_number "set breakpoint here"]
gdb_test "catch fork" "Catchpoint \[0-9\]* \\(fork\\)" \
"explicit parent follow, set tcatch fork"
# ??rehrauer: I don't yet know how to get the id of the tcatch
# via this script, so that I can add a -do list to it. For now,
# do the follow stuff after the catch happens.
gdb_test "continue" \
"Catchpoint \[0-9\]* \\(forked process \[0-9\]*\\),.*" \
"explicit parent follow, tcatch fork"
gdb_test_no_output "set follow-fork parent"
gdb_test "tbreak ${srcfile}:$bp_after_fork" \
"Temporary breakpoint.*, line $bp_after_fork.*" \
"set follow-fork parent, tbreak"
gdb_test "continue" \
"Detaching after fork from.* at .*$bp_after_fork.*" \
"set follow-fork parent, hit tbreak"
# The child has been detached; allow time for any output it might
# generate to arrive, so that output doesn't get confused with
# any expected debugger output from a subsequent testpoint.
#
exec sleep 1
gdb_test "delete breakpoints" \
"" \
"set follow-fork parent, cleanup" \
"Delete all breakpoints. \\(y or n\\) $" \
"y"
}
proc do_fork_tests {} {
global gdb_prompt
# Verify that help is available for "set follow-fork-mode".
#
gdb_test "help set follow-fork-mode" \
"Set debugger response to a program call of fork or vfork..*
A fork or vfork creates a new process. follow-fork-mode can be:.*
.*parent - the original process is debugged after a fork.*
.*child - the new process is debugged after a fork.*
The unfollowed process will continue to run..*
By default, the debugger will follow the parent process..*" \
"help set follow-fork"
# Verify that we can set follow-fork-mode, using an abbreviation
# for both the flag and its value.
#
gdb_test_no_output "set follow-fork ch"
gdb_test "show follow-fork" \
"Debugger response to a program call of fork or vfork is \"child\".*" \
"set follow-fork, using abbreviations"
# Verify that we cannot set follow-fork-mode to nonsense.
#
gdb_test "set follow-fork chork" "Undefined item: \"chork\".*" \
"set follow-fork to nonsense is prohibited"
gdb_test_no_output "set follow-fork parent" "reset parent"
# Check that fork catchpoints are supported, as an indicator for whether
# fork-following is supported.
if [runto_main] then { check_fork_catchpoints }
# Test the default behaviour, which is to follow the parent of a
# fork, and detach from the child. Do this without catchpoints.
#
if [runto_main] then { default_fork_parent_follow }
# Test the ability to explicitly follow the parent of a fork, and
# detach from the child. Do this without catchpoints.
#
if [runto_main] then { explicit_fork_parent_follow }
# Test the ability to follow the child of a fork, and detach from
# the parent. Do this without catchpoints.
#
if [runto_main] then { explicit_fork_child_follow }
# Test the ability to follow both child and parent of a fork. Do
# this without catchpoints.
# ??rehrauer: NYI. Will add testpoints here when implemented.
#
# Test the ability to have the debugger ask the user at fork-time
# whether to follow the parent, child or both. Do this without
# catchpoints.
# ??rehrauer: NYI. Will add testpoints here when implemented.
#
# Test the ability to catch a fork, specify that the child be
# followed, and continue. Make the catchpoint permanent.
#
if [runto_main] then { catch_fork_child_follow }
# Test that parent breakpoints are successfully detached from the
# child at fork time, even if the user removes them from the
# breakpoints list after stopping at a fork catchpoint.
if [runto_main] then { catch_fork_unpatch_child }
# Test the ability to catch a fork, specify via a -do clause that
# the parent be followed, and continue. Make the catchpoint temporary.
#
if [runto_main] then { tcatch_fork_parent_follow }
}
# The "Detaching..." and "Attaching..." messages may be hidden by
# default.
gdb_test_no_output "set verbose"
# This is a test of gdb's ability to follow the parent, child or both
# parent and child of a Unix fork() system call.
#
do_fork_tests
return 0