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 |
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 | |