/* Copyright (C) 2008  Emmanuel Varoquaux

   This file is part of XOS.

   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 <unistd.h>
#include <stdio.h>

int main()
{
  void *_brk;
  volatile int *test_addr;

  printf("dummy printf to malloc memory.\n");

  _brk = sbrk(0);
  printf("brk=%p\n", _brk);
  test_addr = _brk + 4095;

  printf("increasing data segment...\n");
  sbrk(4096);
  _brk = sbrk(0);
  printf("brk=%p\n", _brk);

  printf("checking...\n");
  *test_addr = 0;
  printf("ok.\n");

  printf("decreasing data segment...\n");
  sbrk(-4096);
  _brk = sbrk(0);
  printf("brk=%p\n", _brk);

  printf("segfaulting...\n");
  *test_addr = 0;

  return 0;
}