gdb/testsuite/gdb.base/detach-while-running.exp

# Copyright 2024-2025 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 detaching while the inferior is running.  Basically:
#
#  (gdb) attach PID
#  (gdb) c&
#  (gdb) detach

require can_spawn_for_attach

standard_testfile

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

# The test proper.  See description above.

proc test {} {
    global binfile gdb_prompt

    # This test requires executing commands while the target is
    # running, which, when testing with the remote target, requires
    # non-stop remote protocol.  Until that variant of the RSP is the
    # default, force target non-stop mode on.
    set is_remote \
	[expr {[target_info exists gdb_protocol] \
		   && ([target_info gdb_protocol] == "remote" \
			   || [target_info gdb_protocol] == "extended-remote")}]

    save_vars { ::GDBFLAGS } {
	if {$is_remote} {
	    append ::GDBFLAGS " -ex \"maint set target-non-stop on\""
	}
	clean_restart
	gdb_load $binfile
    }

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

    set any "\[^\r\n\]*"

    # Iterate more than once so that we test re-attaching after
    # detaching, in case GDB incorrectly detaches and the process
    # crashes after the detach.
    set n_iters 2
    for {set iter 1} {$iter <= $n_iters} {incr iter} {
	with_test_prefix "iter=$iter" {
	    set attached 0

	    gdb_test_multiple "attach $testpid" "attach" {
		-re "Attaching to program:${any}process $testpid\r\n.*$gdb_prompt " {
		    pass $gdb_test_name
		    set attached 1
		}
	    }

	    if {!$attached} {
		break
	    }

	    gdb_test_multiple "continue &" "" {
		-re "Continuing\.\r\n$::gdb_prompt " {
		    pass $gdb_test_name
		}
	    }

	    gdb_test "detach" "Detaching from.*"

	    # Sleep a bit before reattaching to let the detached
	    # process crash and exit if e.g., GDB managed to leave
	    # breakpoint traps behind.
	    if {$iter != $n_iters} {
		sleep 1
	    }
	}
    }

    kill_wait_spawned_process $test_spawn_id
}

test