/* 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 <unistd.h>

static int the_sig;

static void

eintr_handler (int sig)

{

  if (sig != the_sig)

    {

      write (STDOUT_FILENO, "eintr_handler: signal number wrong\n", 35);

      _exit (1);

    }

  write (STDOUT_FILENO, ".", 1);

}

static void *

eintr_source (void *arg)

{

  struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000 };

  if (arg == NULL)

    {

      sigset_t ss;

      sigemptyset (&ss);

      sigaddset (&ss, the_sig);

      pthread_sigmask (SIG_BLOCK, &ss, NULL);

    }

  while (1)

    {

      if (arg != NULL)

	pthread_kill (*(pthread_t *) arg, the_sig);

      else

	kill (getpid (), the_sig);

      nanosleep (&ts, NULL);

    }

  /* NOTREACHED */

  return NULL;

}

static void

setup_eintr (int sig, pthread_t *thp)

{

  struct sigaction sa;

  sigemptyset (&sa.sa_mask);

  sa.sa_flags = 0;

  sa.sa_handler = eintr_handler;

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

    {

      puts ("setup_eintr: sigaction failed");

      exit (1);

    }

  the_sig = sig;

  /* Create the thread which will fire off the signals.  */

  pthread_t th;

  if (pthread_create (&th, NULL, eintr_source, thp) != 0)

    {

      puts ("setup_eintr: pthread_create failed");

      exit (1);

    }

}