/* Test that pthread_kill succeeds for an exited thread.
   Copyright (C) 2021-2025 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

/* This test verifies that the default pthread_kill returns 0 (and not
   ESRCH) for a thread that has exited on the kernel side.  */

#include <errno.h>
#include <pthread.h>
#include <shlib-compat.h>
#include <signal.h>
#include <stddef.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xthread.h>

static void *
noop_thread (void *closure)
{
  return NULL;
}

#if TEST_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34) && PTHREAD_IN_LIBC
extern __typeof (pthread_kill) compat_pthread_kill;
compat_symbol_reference (libpthread, compat_pthread_kill, pthread_kill,
                         GLIBC_2_0);
#endif

static int
do_test (void)
{
  pthread_t thr = xpthread_create (NULL, noop_thread, NULL);

  support_wait_for_thread_exit ();

  /* NB: Always uses the default symbol due to separate compilation.  */
  xpthread_kill (thr, SIGUSR1);

#if TEST_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34) && PTHREAD_IN_LIBC
  /* Old binaries need the non-conforming ESRCH error code.  */
  TEST_COMPARE (compat_pthread_kill (thr, SIGUSR1), ESRCH);
#endif

  xpthread_join (thr);

  return 0;
}

#include <support/test-driver.c>
