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/* This testcase is part of GDB, the GNU debugger.

   Copyright 2004, 2007, 2008, 2009, 2010 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/>.

*/

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <unistd.h>

static void *p;

static void

handler (int sig, siginfo_t *info, void *context)

{

  if (info->si_addr == p)

    printf ("Correct si_addr value.\n");

  else

    printf ("Got si_addr = %p, expected %p.\n", info->si_addr, p);

  _exit (0);

}

int

main (void)

{

  /* Set up unwritable memory.  */

  {

    size_t len;

    len = sysconf(_SC_PAGESIZE);

    p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);

    if (p == MAP_FAILED)

      {

        perror ("mmap");

        return 1;

      }

  }

  /* Set up the signal handler.  */

  {

    struct sigaction action;

    memset (&action, 0, sizeof (action));

    action.sa_sigaction = handler;

    action.sa_flags |= SA_SIGINFO;

    if (sigaction (SIGSEGV, &action, NULL))

      {

        perror ("sigaction");

        return 1;

      }

  }

  /* Trigger SIGSEGV.  */

  *(int *)p = 0;

  return 0;

}