# This testcase is part of GDB, the GNU debugger.

# Copyright 2016-2020 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/>.

# Test attach / detach from a process that uses raw clone.  We use raw
# clone as proxy for when libthread_db is not available.

# This only works on targets with the Linux kernel.
if ![istarget *-*-linux*] {
    return
}

if {![can_spawn_for_attach]} {
    return 0
}

standard_testfile

if [prepare_for_testing "failed to prepare" $testfile $srcfile {debug}] {
    return -1
}

clean_restart ${binfile}

set test_spawn_id [spawn_wait_for_attach $binfile]
set testpid [spawn_id_get_pid $test_spawn_id]

# Native/gdbserver.
set thread_re "(LWP $decimal|Thread )"

# Try attach / detach a few times, in case GDB ends up with stale
# state after detaching.

set attempts 3
for {set attempt 1} {$attempt <= $attempts} {incr attempt} {
    with_test_prefix "fg attach $attempt" {

	gdb_test "attach $testpid" \
	    "Attaching to program.*process $testpid.*" \
	    "attach"

	gdb_test "info threads" \
	    "1.*${thread_re}.*\r\n.*2.*${thread_re}.*" \
	    "info threads shows two LWPs"

	gdb_test "detach" "Detaching from .*, process $testpid\r\n\\\[Inferior $decimal \\(.*\\) detached\\\]"
    }
}

# Same, but use async/background attach.

# If debugging with target remote, check whether the all-stop variant
# of the RSP is being used.  If so, we can't run the background tests.
if {[target_info exists gdb_protocol]
    && ([target_info gdb_protocol] == "remote"
	|| [target_info gdb_protocol] == "extended-remote")} {

    set test "maint show target-non-stop"
    gdb_test_multiple "maint show target-non-stop" $test {
	-re "(is|currently) on.*$gdb_prompt $" {
	}
	-re "(is|currently) off.*$gdb_prompt $" {
	    unsupported "bg attach: can't issue info threads while target is running"
	    return 0
	}
    }
}

set attempts 3
for {set attempt 1} {$attempt <= $attempts} {incr attempt} {
    with_test_prefix "bg attach $attempt" {

	gdb_test "attach $testpid &" \
	    "Attaching to program.*process $testpid.*" \
	    "attach"

	gdb_test "info threads" \
	    "1.*${thread_re}.*\\(running\\)\r\n.*2.*${thread_re}.*\\(running\\)" \
	    "info threads shows two LWPs"

	gdb_test "detach" "Detaching from .*, process $testpid\r\n\\\[Inferior $decimal \\(.*\\) detached\\\]"
    }
}

kill_wait_spawned_process $test_spawn_id