1 /* Copyright (C) 2005-2022 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 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <unistd.h>
21
22 /* Read the contents of the symbolic link PATH relative to FD into no
23 more than LEN bytes of BUF. The contents are not null-terminated.
24 Returns the number of characters read, or -1 for errors. */
25 ssize_t
readlinkat(int fd,const char * path,char * buf,size_t len)26 readlinkat (int fd, const char *path, char *buf, size_t len)
27 {
28 if (path == NULL)
29 {
30 __set_errno (EINVAL);
31 return -1;
32 }
33
34 if (fd != AT_FDCWD && fd < 0 && *path != '/')
35 {
36 __set_errno (EBADF);
37 return -1;
38 }
39
40 __set_errno (ENOSYS);
41 return -1;
42 }
43 stub_warning (readlinkat)
44 libc_hidden_def (readlinkat)
45