old-cross-binutils/gdb/testsuite/gdb.base/attach.exp
Jan Kratochvil 1cf2f1b045 testsuite: Fix runaway attach processes
I have started seeing occasional runaway 'attach' processes these days.
I cannot be certain it is really caused by this patch, for example
grep 'FAIL.*cmdline attach run' does not show anything in my logs.

But as I remember this 'attach' runaway process always happened in GDB (but
I do not remember it in the past months) I think it would be most safe to just
solve it forever by [attached].

gdb/testsuite/ChangeLog
2014-09-12  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.base/attach.c: Include unistd.h.
	(main): Call alarm.  Add label postloop.
	* gdb.base/attach.exp (do_attach_tests): Use gdb_get_line_number,
	gdb_breakpoint, gdb_continue_to_breakpoint.
	(test_command_line_attach_run): Kill ${testpid} in one exit path.
2014-09-12 13:39:04 +02:00

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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/>. */
# On HP-UX 11.0, this test is causing a process running the program
# "attach" to be left around spinning. Until we figure out why, I am
# commenting out the test to avoid polluting tiamat (our 11.0 nightly
# test machine) with these processes. RT
#
# Setting the magic bit in the target app should work. I added a
# "kill", and also a test for the R3 register warning. JB
if { [istarget "hppa*-*-hpux*"] } {
return 0
}
# are we on a target board
if [is_remote target] then {
return 0
}
standard_testfile attach.c attach2.c
set binfile2 ${binfile}2
set escapedbinfile [string_to_regexp $binfile]
#execute_anywhere "rm -f ${binfile} ${binfile2}"
remote_exec build "rm -f ${binfile} ${binfile2}"
# For debugging this test
#
#log_user 1
# build the first test case
#
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested attach.exp
return -1
}
# Build the in-system-call test
if { [gdb_compile "${srcdir}/${subdir}/${srcfile2}" "${binfile2}" executable {debug}] != "" } {
untested attach.exp
return -1
}
if [get_compiler_info] {
return -1
}
proc do_attach_tests {} {
global gdb_prompt
global binfile
global escapedbinfile
global srcfile
global testfile
global subdir
global timeout
# Start the program running and then wait for a bit, to be sure
# that it can be attached to.
set testpid [spawn_wait_for_attach $binfile]
# Verify that we cannot attach to nonsense.
set test "attach to nonsense is prohibited"
gdb_test_multiple "attach abc" "$test" {
-re "Illegal process-id: abc\\.\r\n$gdb_prompt $" {
pass "$test"
}
-re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
# Response expected from /proc-based systems.
pass "$test"
}
-re "Can't attach to process..*$gdb_prompt $" {
# Response expected on Cygwin
pass "$test"
}
-re "Attaching to.*$gdb_prompt $" {
fail "$test (bogus pid allowed)"
}
}
# Verify that we cannot attach to nonsense even if its initial part is
# a valid PID.
set test "attach to digits-starting nonsense is prohibited"
gdb_test_multiple "attach ${testpid}x" "$test" {
-re "Illegal process-id: ${testpid}x\\.\r\n$gdb_prompt $" {
pass "$test"
}
-re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
# Response expected from /proc-based systems.
pass "$test"
}
-re "Can't attach to process..*$gdb_prompt $" {
# Response expected on Cygwin
pass "$test"
}
-re "Attaching to.*$gdb_prompt $" {
fail "$test (bogus pid allowed)"
}
}
# Verify that we cannot attach to what appears to be a valid
# process ID, but is a process that doesn't exist. Traditionally,
# most systems didn't have a process with ID 0, so we take that as
# the default. However, there are a few exceptions.
set boguspid 0
if { [istarget "*-*-*bsd*"] } {
# In FreeBSD 5.0, PID 0 is used for "swapper". Use -1 instead
# (which should have the desired effect on any version of
# FreeBSD, and probably other *BSD's too).
set boguspid -1
}
set test "attach to nonexistent process is prohibited"
gdb_test_multiple "attach $boguspid" "$test" {
-re "Attaching to.*, process $boguspid.*No such process.*$gdb_prompt $" {
# Response expected on ptrace-based systems (i.e. HP-UX 10.20).
pass "$test"
}
-re "Attaching to.*, process $boguspid failed.*Hint.*$gdb_prompt $" {
# Response expected on ttrace-based systems (i.e. HP-UX 11.0).
pass "$test"
}
-re "Attaching to.*, process $boguspid.*denied.*$gdb_prompt $" {
pass "$test"
}
-re "Attaching to.*, process $boguspid.*not permitted.*$gdb_prompt $" {
pass "$test"
}
-re "Attaching to.*, process .*couldn't open /proc file.*$gdb_prompt $" {
# Response expected from /proc-based systems.
pass "$test"
}
-re "Can't attach to process..*$gdb_prompt $" {
# Response expected on Cygwin
pass "$test"
}
-re "Attaching to.*, process $boguspid.*failed.*$gdb_prompt $" {
# Response expected on the extended-remote target.
pass "$test"
}
}
# Verify that we can attach to the process by first giving its
# executable name via the file command, and using attach with the
# process ID.
# (Actually, the test system appears to do this automatically for
# us. So, we must also be prepared to be asked if we want to
# discard an existing set of symbols.)
set test "set file, before attach1"
gdb_test_multiple "file $binfile" "$test" {
-re "Load new symbol table from.*y or n. $" {
gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*done." \
"$test (re-read)"
}
-re "Reading symbols from $escapedbinfile\.\.\.*done.*$gdb_prompt $" {
pass "$test"
}
}
set test "attach1, after setting file"
gdb_test_multiple "attach $testpid" "$test" {
-re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*main.*at .*$srcfile:.*$gdb_prompt $" {
pass "$test"
}
-re "Attaching to program.*`?$escapedbinfile\.exe'?, process $testpid.*\[Switching to thread $testpid\..*\].*$gdb_prompt $" {
# Response expected on Cygwin
pass "$test"
}
}
# Verify that we can "see" the variable "should_exit" in the
# program, and that it is zero.
gdb_test "print should_exit" " = 0" "after attach1, print should_exit"
# Detach the process.
gdb_test "detach" \
"Detaching from program: .*$escapedbinfile, process $testpid" \
"attach1 detach"
# Wait a bit for gdb to finish detaching
exec sleep 5
# Purge the symbols from gdb's brain. (We want to be certain the
# next attach, which won't be preceded by a "file" command, is
# really getting the executable file without our help.)
set old_timeout $timeout
set timeout 15
set test "attach1, purging symbols after detach"
gdb_test_multiple "file" "$test" {
-re "No executable file now.*Discard symbol table.*y or n. $" {
gdb_test "y" "No symbol file now." "$test"
}
}
set timeout $old_timeout
# Verify that we can attach to the process just by giving the
# process ID.
set test "attach2, with no file"
set found_exec_file 0
gdb_test_multiple "attach $testpid" "$test" {
-re "Attaching to process $testpid.*Load new symbol table from \"$escapedbinfile\.exe\".*y or n. $" {
# On Cygwin, the DLL's symbol tables are loaded prior to the
# executable's symbol table. This in turn always results in
# asking the user for actually loading the symbol table of the
# executable.
gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*done." \
"$test (reset file)"
set found_exec_file 1
}
-re "Attaching to process $testpid.*Reading symbols from $escapedbinfile.*main.*at .*$gdb_prompt $" {
pass "$test"
set found_exec_file 1
}
}
if {$found_exec_file == 0} {
set test "load file manually, after attach2"
gdb_test_multiple "file $binfile" "$test" {
-re "A program is being debugged already..*Are you sure you want to change the file.*y or n. $" {
gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*done." \
"$test (re-read)"
}
-re "Reading symbols from $escapedbinfile\.\.\.*done.*$gdb_prompt $" {
pass "$test"
}
}
}
# Verify that we can modify the variable "should_exit" in the
# program.
gdb_test_no_output "set should_exit=1" "after attach2, set should_exit"
# Verify that the modification really happened.
gdb_breakpoint [gdb_get_line_number "postloop"] temporary
gdb_continue_to_breakpoint "postloop" ".* postloop .*"
# Allow the test process to exit, to cleanup after ourselves.
gdb_continue_to_end "after attach2, exit"
# Make sure we don't leave a process around to confuse
# the next test run (and prevent the compile by keeping
# the text file busy), in case the "set should_exit" didn't
# work.
remote_exec build "kill -9 ${testpid}"
set testpid [spawn_wait_for_attach $binfile]
# Verify that we can attach to the process, and find its a.out
# when we're cd'd to some directory that doesn't contain the
# a.out. (We use the source path set by the "dir" command.)
gdb_test "dir [standard_output_file {}]" "Source directories searched: .*" \
"set source path"
gdb_test "cd /tmp" "Working directory /tmp." \
"cd away from process working directory"
# Explicitly flush out any knowledge of the previous attachment.
set test "before attach3, flush symbols"
gdb_test_multiple "symbol-file" "$test" {
-re "Discard symbol table from.*y or n. $" {
gdb_test "y" "No symbol file now." \
"$test"
}
-re "No symbol file now.*$gdb_prompt $" {
pass "$test"
}
}
gdb_test "exec" "No executable file now." \
"before attach3, flush exec"
gdb_test "attach $testpid" \
"Attaching to process $testpid.*Reading symbols from $escapedbinfile.*main.*at .*" \
"attach when process' a.out not in cwd"
set test "after attach3, exit"
gdb_test "kill" \
"" \
"$test" \
"Kill the program being debugged.*y or n. $" \
"y"
# Another "don't leave a process around"
remote_exec build "kill -9 ${testpid}"
}
proc do_call_attach_tests {} {
global gdb_prompt
global binfile2
set testpid [spawn_wait_for_attach $binfile2]
# Attach
gdb_test "file $binfile2" ".*" "force switch to gdb64, if necessary"
set test "attach call"
gdb_test_multiple "attach $testpid" "$test" {
-re "warning: reading register.*I.*O error.*$gdb_prompt $" {
fail "$test (read register error)"
}
-re "Attaching to.*process $testpid.*libc.*$gdb_prompt $" {
pass "$test"
}
-re "Attaching to.*process $testpid.*\[Switching to thread $testpid\..*\].*$gdb_prompt $" {
pass "$test"
}
}
# See if other registers are problems
set test "info other register"
gdb_test_multiple "i r r3" "$test" {
-re "warning: reading register.*$gdb_prompt $" {
fail "$test"
}
-re "r3.*$gdb_prompt $" {
pass "$test"
}
}
# Get rid of the process
gdb_test "p should_exit = 1"
gdb_continue_to_end
# Be paranoid
remote_exec build "kill -9 ${testpid}"
}
proc do_command_attach_tests {} {
global gdb_prompt
global binfile
global verbose
global GDB
global INTERNAL_GDBFLAGS
global GDBFLAGS
if ![isnative] then {
unsupported "command attach test"
return 0
}
set testpid [spawn_wait_for_attach $binfile]
gdb_exit
if $verbose>1 then {
send_user "Spawning $GDB $INTERNAL_GDBFLAGS $GDBFLAGS --pid=$testpid\n"
}
eval "spawn $GDB $INTERNAL_GDBFLAGS $GDBFLAGS --pid=$testpid"
set test "starting with --pid"
expect {
-re "Reading symbols from.*$gdb_prompt $" {
pass "$test"
}
timeout {
fail "$test (timeout)"
}
}
# Get rid of the process
remote_exec build "kill -9 ${testpid}"
}
# Test ' gdb --pid PID -ex "run" '. GDB used to have a bug where
# "run" would run before the attach finished - PR17347.
proc test_command_line_attach_run {} {
global gdb_prompt
global binfile
if ![isnative] then {
unsupported "commandline attach run test"
return 0
}
with_test_prefix "cmdline attach run" {
set testpid [spawn_wait_for_attach $binfile]
set test "run to prompt"
gdb_exit
set res [gdb_spawn_with_cmdline_opts \
"-iex \"set height 0\" -iex \"set width 0\" --pid=$testpid -ex \"start\""]
if { $res != 0} {
fail $test
remote_exec build "kill -9 ${testpid}"
return $res
}
gdb_test_multiple "" $test {
-re {Attaching to.*Start it from the beginning\? \(y or n\) } {
pass $test
}
}
send_gdb "y\n"
set test "run to main"
gdb_test_multiple "" $test {
-re "Temporary breakpoint .* main .*$gdb_prompt $" {
pass $test
}
}
# Get rid of the process
remote_exec build "kill -9 ${testpid}"
}
}
# Start with a fresh gdb
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
# This is a test of gdb's ability to attach to a running process.
do_attach_tests
# Test attaching when the target is inside a system call
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
do_call_attach_tests
# Test "gdb --pid"
do_command_attach_tests
test_command_line_attach_run
return 0