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/* Increase stack size limit if possible.

   Copyright (C) 2011 Free Software Foundation, Inc.

This file is part of the libiberty library.  This library 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 2, or (at your option)

any later version.

This 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 General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU CC; see the file COPYING.  If not, write to

the Free Software Foundation, 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.

As a special exception, if you link this library with files

compiled with a GNU compiler to produce an executable, this does not cause

the resulting executable to be covered by the GNU General Public License.

This exception does not however invalidate any other reasons why

the executable file might be covered by the GNU General Public License. */

/*

@deftypefn Extension void stack_limit_increase (unsigned long @var{pref})

Attempt to increase stack size limit to @var{pref} bytes if possible.

@end deftypefn

*/

#include "config.h"

#ifdef HAVE_STDINT_H

#include <stdint.h>

#endif

#ifdef HAVE_SYS_RESOURCE_H

#include <sys/resource.h>

#endif

void

stack_limit_increase (unsigned long pref)

{

#if defined(HAVE_SETRLIMIT) && defined(HAVE_GETRLIMIT) \

    && defined(RLIMIT_STACK) && defined(RLIM_INFINITY)

  struct rlimit rlim;

  if (getrlimit (RLIMIT_STACK, &rlim) == 0

      && rlim.rlim_cur != RLIM_INFINITY

      && rlim.rlim_cur < pref

      && (rlim.rlim_max == RLIM_INFINITY || rlim.rlim_cur < rlim.rlim_max))

    {

      rlim.rlim_cur = pref;

      if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_cur > rlim.rlim_max)

        rlim.rlim_cur = rlim.rlim_max;

      setrlimit (RLIMIT_STACK, &rlim);

    }

#endif

}