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# Copyright 2014-2021 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/>. */
# Verify that GDB waits for the "attach" command to finish before
# processing the following command.
#
# GDB used to have a race where on async targets, in the small window
# between the attach request and the initial stop for the attach, GDB
# was still processing user input.
#
# The issue was originally detected with:
#
# echo -e "attach PID\nset xxx=1" | gdb
#
# In that scenario, stdin is not a tty, which disables readline.
# Explicitly turning off editing exercises the same code path, and is
# simpler to do, so we test with both editing on and off.
# The test uses the "attach" command.
if [use_gdb_stub] {
return
}
standard_testfile
if {[build_executable "failed to build" $testfile $srcfile debug]} {
return -1
}
# Start the program running, and return its PID, ready for attaching.
proc start_program {binfile} {
global gdb_prompt
global decimal
clean_restart $binfile
if ![runto setup_done] then {
fail "can't run to setup_done"
return 0
}
# Get the PID of the test process.
set testpid ""
set test "get inferior process ID"
gdb_test_multiple "p mypid" $test {
-re " = ($decimal)\r\n$gdb_prompt $" {
set testpid $expect_out(1,string)
pass $test
}
}
gdb_test "detach" "Detaching from program: .*"
if {$testpid == ""} {
return
}
return $testpid
}
# Do test proper. EDITING indicates whether "set editing" is on or
# off.
proc test { editing } {
global gdb_prompt
global binfile
global decimal
with_test_prefix "editing $editing" {
set testpid [start_program $binfile]
if {$testpid == ""} {
return
}
# Enable/disable readline.
gdb_test_no_output "set editing $editing"
# Send both commands at once.
send_gdb "attach $testpid\nprint should_exit = 1\n"
# Use gdb_expect directly instead of gdb_test_multiple to
# avoid races with the double prompt.
set test "attach and print"
gdb_expect {
-re "Attaching to program.*process $testpid\r\n.*$gdb_prompt.*$decimal = 1\r\n$gdb_prompt $" {
pass "$test"
}
timeout {
fail "$test (timeout)"
}
}
# As we've used attach, on quit, we'll detach from the
# program. Explicitly kill it in case we failed above.
gdb_test "kill" \
"" \
"after attach, exit" \
"Kill the program being debugged.*y or n. $" \
"y"
}
}
foreach editing {"on" "off"} {
test $editing
}
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