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/* Copyright 1992, 1993, 1994, 1995, 1996, 1999, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

   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/>.  */

/* Simple little program that just generates a core dump from inside some

   nested function calls. */

#include <stdio.h>

#include <sys/types.h>

#include <fcntl.h>

#include <sys/mman.h>

#include <signal.h>

#include <stdlib.h>

#include <unistd.h>

#ifndef __STDC__

#define const   /**/

#endif

#define MAPSIZE (8 * 1024)

/* Don't make these automatic vars or we will have to walk back up the

   stack to access them. */

char *buf1;

char *buf2;

int coremaker_data = 1; /* In Data section */

int coremaker_bss;      /* In BSS section */

const int coremaker_ro = 201;   /* In Read-Only Data section */

/* Note that if the mapping fails for any reason, we set buf2

   to -1 and the testsuite notices this and reports it as

   a failure due to a mapping error.  This way we don't have

   to test for specific errors when running the core maker. */

void

mmapdata ()

{

  int j, fd;

  /* Allocate and initialize a buffer that will be used to write

     the file that is later mapped in. */

  buf1 = (char *) malloc (MAPSIZE);

  for (j = 0; j < MAPSIZE; ++j)

    {

      buf1[j] = j;

    }

  /* Write the file to map in */

  fd = open ("coremmap.data", O_CREAT | O_RDWR, 0666);

  if (fd == -1)

    {

      perror ("coremmap.data open failed");

      buf2 = (char *) -1;

      return;

    }

  write (fd, buf1, MAPSIZE);

  /* Now map the file into our address space as buf2 */

  buf2 = (char *) mmap (0, MAPSIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);

  if (buf2 == (char *) -1)

    {

      perror ("mmap failed");

      return;

    }

  /* Verify that the original data and the mapped data are identical.

     If not, we'd rather fail now than when trying to access the mapped

     data from the core file. */

  for (j = 0; j < MAPSIZE; ++j)

    {

      if (buf1[j] != buf2[j])

        {

          fprintf (stderr, "mapped data is incorrect");

          buf2 = (char *) -1;

          return;

        }

    }

  /* Touch buf2 so kernel writes it out into 'core'. */

  buf2[0] = buf1[0];

}

void

func2 ()

{

  int coremaker_local[5];

  int i;

#ifdef SA_FULLDUMP

  /* Force a corefile that includes the data section for AIX.  */

  {

    struct sigaction sa;

    sigaction (SIGABRT, (struct sigaction *)0, &sa);

    sa.sa_flags |= SA_FULLDUMP;

    sigaction (SIGABRT, &sa, (struct sigaction *)0);

  }

#endif

  /* Make sure that coremaker_local doesn't get optimized away. */

  for (i = 0; i < 5; i++)

    coremaker_local[i] = i;

  coremaker_bss = 0;

  for (i = 0; i < 5; i++)

    coremaker_bss += coremaker_local[i];

  coremaker_data = coremaker_ro + 1;

  abort ();

}

void

func1 ()

{

  func2 ();

}

int main ()

{

  mmapdata ();

  func1 ();

  return 0;

}