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[glibc.git] / sysdeps / unix / sysv / linux / generic / readlink_chk.c
blob1fbb90d1d9e1b60c4cff20589bb7c8833c33e3a0
1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C 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 GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <unistd.h>
20 #include <fcntl.h>
21 #include <sys/param.h>
22 #ifdef HAVE_INLINED_SYSCALLS
23 # include <errno.h>
24 # include <sysdep.h>
25 #endif
28 ssize_t
29 __readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
31 if (len > buflen)
32 __chk_fail ();
34 #ifdef HAVE_INLINED_SYSCALLS
35 return INLINE_SYSCALL (readlinkat, 4, AT_FDCWD, path, buf, len);
36 #else
37 return __readlink (path, buf, len);
38 #endif