sysdeps/mach/hurd/setrlimit.c

   1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19
  20 #include <hurd.h>
  21 #include <hurd/fd.h>
  22 #include <hurd/resource.h>
  23
  24 /* Set the soft and hard limits for RESOURCE to *RLIMITS.
  25    Only the super-user can increase hard limits.
  26    Return 0 if successful, -1 if not (and sets errno).  */
  27 int
  28 __setrlimit (enum __rlimit_resource resource, const struct rlimit *rlimits)
  29 {
  30   struct rlimit lim;
  31
  32   if (rlimits == NULL || (unsigned int) resource >= RLIMIT_NLIMITS)
  33     {
  34       errno = EINVAL;
  35       return -1;
  36     }
  37
  38   lim = *rlimits;
  39
  40   /* Even though most limits do nothing, there is no inheritance, and hard
  41      limits are not really hard, we just let any old call succeed to make
  42      life easier for programs that expect normal behavior.  */
  43
  44   if (lim.rlim_cur > lim.rlim_max)
  45     lim.rlim_cur = lim.rlim_max;
  46
  47   HURD_CRITICAL_BEGIN;
  48   __mutex_lock (&_hurd_rlimit_lock);
  49   _hurd_rlimits[resource] = lim;
  50   __mutex_unlock (&_hurd_rlimit_lock);
  51   HURD_CRITICAL_END;
  52
  53   return 0;
  54 }
  55
  56 weak_alias (__setrlimit, setrlimit)