debug/readlink_chk.c

   1 /* Copyright (C) 2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <unistd.h>
  20 #include <sys/param.h>
  21 #ifdef HAVE_INLINED_SYSCALLS
  22 # include <errno.h>
  23 # include <sysdep.h>
  24 #endif
  25
  26
  27 ssize_t
  28 __readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
  29 {
  30   if (len > buflen)
  31     __chk_fail ();
  32
  33 #ifdef HAVE_INLINED_SYSCALLS
  34   return INLINE_SYSCALL (readlink, 3, path, buf, len);
  35 #else
  36   return __readlink (path, buf, len);
  37 #endif
  38 }