/* Test of c-stack module.

   Copyright (C) 2002, 2004, 2006, 2008-2017 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 <config.h>

#include "c-stack.h"

#include "exitfail.h"

#include <stdio.h>

#if HAVE_SETRLIMIT

/* At least FreeBSD 5.0 needs extra headers before <sys/resource.h>

   will compile.  */

# include <sys/types.h>

# include <sys/time.h>

# include <sys/resource.h>

#endif

#include "macros.h"

static volatile int *

recurse_1 (volatile int n, volatile int *p)

{

  if (n >= 0)

    *recurse_1 (n + 1, p) += n;

  return p;

}

static int

recurse (volatile int n)

{

  int sum = 0;

  return *recurse_1 (n, &sum);

}

int

main (int argc, char **argv)

{

#if HAVE_SETRLIMIT && defined RLIMIT_STACK

  /* Before starting the endless recursion, try to be friendly to the

     user's machine.  On some Linux 2.2.x systems, there is no stack

     limit for user processes at all.  We don't want to kill such

     systems.  */

  struct rlimit rl;

  rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */

  setrlimit (RLIMIT_STACK, &rl);

#endif

  if (c_stack_action (NULL) == 0)

    {

      if (1 < argc)

        {

          exit_failure = 77;

          ++*argv[argc]; /* Intentionally dereference NULL.  */

        }

      return recurse (0);

    }

  fputs ("skipping test: ", stderr);

  perror ("c_stack_action");

  return 77;

}