debug/readlinkat_chk.c

   1 /* Copyright (C) 2006-2016 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 <unistd.h>
  19 #include <sys/param.h>
  20
  21
  22 ssize_t
  23 __readlinkat_chk (int fd, const char *path, void *buf, size_t len,
  24                   size_t buflen)
  25 {
  26   if (len > buflen)
  27     __chk_fail ();
  28
  29   return readlinkat (fd, path, buf, len);
  30 }