debug/getgroups_chk.c

   1 /* Copyright (C) 2005, 2008 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 #include <unistd.h>
  20
  21
  22 int
  23 __getgroups_chk (int size, __gid_t list[], size_t listlen)
  24 {
  25   if (__builtin_expect (size < 0, 0))
  26     {
  27       __set_errno (EINVAL);
  28       return -1;
  29     }
  30
  31   if (__builtin_expect (size * sizeof (__gid_t) > listlen, 0))
  32     __chk_fail ();
  33
  34   return __getgroups (size, list);
  35 }