1  /* Increase stack size limit if possible.
       2     Copyright (C) 2011-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of the libiberty library.  This library is free
       5  software; you can redistribute it and/or modify it under the
       6  terms of the GNU General Public License as published by the
       7  Free Software Foundation; either version 2, or (at your option)
       8  any later version.
       9  
      10  This library is distributed in the hope that it will be useful,
      11  but WITHOUT ANY WARRANTY; without even the implied warranty of
      12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13  GNU General Public License for more details.
      14  
      15  You should have received a copy of the GNU General Public License
      16  along with GNU CC; see the file COPYING.  If not, write to
      17  the Free Software Foundation, 51 Franklin Street - Fifth Floor,
      18  Boston, MA 02110-1301, USA.
      19  
      20  As a special exception, if you link this library with files
      21  compiled with a GNU compiler to produce an executable, this does not cause
      22  the resulting executable to be covered by the GNU General Public License.
      23  This exception does not however invalidate any other reasons why
      24  the executable file might be covered by the GNU General Public License. */
      25  
      26  /*
      27  
      28  @deftypefn Extension void stack_limit_increase (unsigned long @var{pref})
      29  
      30  Attempt to increase stack size limit to @var{pref} bytes if possible.
      31  
      32  @end deftypefn
      33  
      34  */
      35  
      36  #include "config.h"
      37  #include "ansidecl.h"
      38  
      39  #ifdef HAVE_STDINT_H
      40  #include <stdint.h>
      41  #endif
      42  #ifdef HAVE_SYS_RESOURCE_H
      43  #include <sys/resource.h>
      44  #endif
      45  
      46  void
      47  stack_limit_increase (unsigned long pref ATTRIBUTE_UNUSED)
      48  {
      49  #if defined(HAVE_SETRLIMIT) && defined(HAVE_GETRLIMIT) \
      50      && defined(RLIMIT_STACK) && defined(RLIM_INFINITY)
      51    struct rlimit rlim;
      52    if (getrlimit (RLIMIT_STACK, &rlim) == 0
      53        && rlim.rlim_cur != RLIM_INFINITY
      54        && rlim.rlim_cur < pref
      55        && (rlim.rlim_max == RLIM_INFINITY || rlim.rlim_cur < rlim.rlim_max))
      56      {
      57        rlim.rlim_cur = pref;
      58        if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_cur > rlim.rlim_max)
      59  	rlim.rlim_cur = rlim.rlim_max;
      60        setrlimit (RLIMIT_STACK, &rlim);
      61      }
      62  #endif
      63  }