--- /dev/null
+# Copyright (C) 2024 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 attaching to a program after its main thread has exited.
+
+require can_spawn_for_attach
+
+standard_testfile leader-exit.c
+
+if {[build_executable "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
+ return
+}
+
+set escapedbinfile [string_to_regexp ${binfile}]
+
+set test_spawn_id [spawn_wait_for_attach $binfile]
+set testpid [spawn_id_get_pid $test_spawn_id]
+
+# Wait a bit for the leader thread to exit, before attaching.
+sleep 2
+
+clean_restart ${binfile}
+
+# Save this early as we may not be able to talk with GDBserver anymore
+# when we need to check it.
+set is_gdbserver [target_is_gdbserver]
+
+# True if successfully attached.
+set attached 0
+
+gdb_test_multiple "attach $testpid" "attach" {
+ -re "Attaching to process $testpid failed.*" {
+ # GNU/Linux gdbserver. Linux ptrace does not let you attach
+ # to zombie threads.
+ setup_kfail "gdb/31555" *-*-linux*
+ fail $gdb_test_name
+ }
+ -re "warning: process $testpid is a zombie - the process has already terminated.*" {
+ # Native GNU/Linux. Linux ptrace does not let you attach to
+ # zombie threads.
+ setup_kfail "gdb/31555" *-*-linux*
+ fail $gdb_test_name
+ }
+ -re "Attaching to program: $escapedbinfile, process $testpid.*$gdb_prompt $" {
+ pass $gdb_test_name
+ set attached 1
+ }
+}
+
+# With gdbserver, after we failed to attach, we hit PR server/31554:
+# print $_inferior_thread_count
+# Remote connection closed
+# (gdb) KFAIL: gdb.threads/leader-exit-attach.exp: get valueof "$_inferior_thread_count"
+if {!$attached && $is_gdbserver} {
+ setup_kfail "server/31554" "*-*-*"
+}
+
+set thread_count [get_valueof "" "\$_inferior_thread_count" -1]
+
+if {$thread_count == -1} {
+ kill_wait_spawned_process $test_spawn_id
+ return
+}
+
+if {$attached} {
+ # Check that we have at least one thread. We can't assume there
+ # will only be exactly one thread, because on some systems, like
+ # Cygwin, the runtime spawns extra threads. Also, on Windows,
+ # attaching always injects one extra thread.
+ gdb_assert {$thread_count >= 1}
+} else {
+ gdb_assert {$thread_count == 0}
+}
+
+kill_wait_spawned_process $test_spawn_id