/* Copyright (C) 2003-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   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

   <http://www.gnu.org/licenses/>.  */

#include <pthread.h>

#include <signal.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#ifdef SIGRTMIN

# define N 2

static pthread_barrier_t bar;

static struct

{

  void *p;

  pthread_t s;

} ti[N];

static int sig1;

static void

handler (int sig)

{

  pthread_t self = pthread_self ();

  size_t i;

  for (i = 0; i < N; ++i)

    if (ti[i].s == self)

      {

	if ((uintptr_t) ti[i].p <= (uintptr_t) &self

	    && (uintptr_t) ti[i].p + 2 * MINSIGSTKSZ > (uintptr_t) &self)

	  {

	    puts ("alt stack not used");

	    exit (1);

	  }

	printf ("thread %zu used alt stack for signal %d\n", i, sig);

	return;

      }

  puts ("handler: thread not found");

  exit (1);

}

static void *

tf (void *arg)

{

  size_t nr = (uintptr_t) arg;

  if (nr >= N)

    {

      puts ("wrong nr parameter");

      exit (1);

    }

  sigset_t ss;

  sigemptyset (&ss);

  size_t i;

  for (i = 0; i < N; ++i)

    if (i != nr)

      if (sigaddset (&ss, sig1 + i) != 0)

	{

	  puts ("tf: sigaddset failed");

	  exit (1);

	}

  if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)

    {

      puts ("tf: sigmask failed");

      exit (1);

    }

  void *p = malloc (2 * MINSIGSTKSZ);

  if (p == NULL)

    {

      puts ("tf: malloc failed");

      exit (1);

    }

  stack_t s;

  s.ss_sp = p;

  s.ss_size = 2 * MINSIGSTKSZ;

  s.ss_flags = 0;

  if (sigaltstack (&s, NULL) != 0)

    {

      puts ("tf: sigaltstack failed");

      exit (1);

    }

  ti[nr].p = p;

  ti[nr].s = pthread_self ();

  pthread_barrier_wait (&bar);

  pthread_barrier_wait (&bar);

  return NULL;

}

static int

do_test (void)

{

  sig1 = SIGRTMIN;

  if (sig1 + N > SIGRTMAX)

    {

      puts ("too few RT signals");

      return 0;

    }

  struct sigaction sa;

  sa.sa_handler = handler;

  sa.sa_flags = 0;

  sigemptyset (&sa.sa_mask);

  if (sigaction (sig1, &sa, NULL) != 0

      || sigaction (sig1 + 1, &sa, NULL) != 0

      || sigaction (sig1 + 2, &sa, NULL) != 0)

    {

      puts ("sigaction failed");

      return 1;

    }

  if (pthread_barrier_init (&bar, NULL, 1 + N) != 0)

    {

      puts ("barrier_init failed");

      return 1;

    }

  pthread_t th[N];

  size_t i;

  for (i = 0; i < N; ++i)

    if (pthread_create (&th[i], NULL, tf, (void *) (long int) i) != 0)

      {

	puts ("create failed");

	return 1;

      }

  /* Block the three signals.  */

  sigset_t ss;

  sigemptyset (&ss);

  for (i = 0; i <= N; ++i)

    sigaddset (&ss, sig1 + i);

  if (pthread_sigmask (SIG_BLOCK, &ss, NULL) != 0)

    {

      puts ("main: sigmask failed");

      return 1;

    }

  pthread_barrier_wait (&bar);

  /* Send some signals.  */

  pid_t me = getpid ();

  kill (me, sig1 + N);

  for (i = 0; i < N; ++i)

    kill (me, sig1 + i);

  kill (me, sig1 + N);

  /* Give the signals a chance to be worked on.  */

  sleep (1);

  pthread_barrier_wait (&bar);

  for (i = 0; i < N; ++i)

    if (pthread_join (th[i], NULL) != 0)

      {

	puts ("join failed");

	return 1;

      }

  return 0;

}

# define TEST_FUNCTION do_test ()

#else

# define TEST_FUNCTION 0

#endif

#include "../test-skeleton.c"