1 | /* Copyright (C) 1991-2022 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 <stdio.h> |
19 | #include <unistd.h> |
20 | #include <errno.h> |
21 | |
22 | /* Rename the file OLD to NEW. */ |
23 | int |
24 | rename (const char *old, const char *new) |
25 | { |
26 | int save = errno; |
27 | if (__link (from: old, to: new) < 0) |
28 | { |
29 | if (errno == EEXIST) |
30 | { |
31 | __set_errno (save); |
32 | /* Race condition, required for 1003.1 conformance. */ |
33 | if (__unlink (name: new) < 0 |
34 | || __link (from: old, to: new) < 0) |
35 | return -1; |
36 | } |
37 | else |
38 | return -1; |
39 | } |
40 | if (__unlink (name: old) < 0) |
41 | { |
42 | save = errno; |
43 | if (__unlink (name: new) == 0) |
44 | __set_errno (save); |
45 | return -1; |
46 | } |
47 | return 0; |
48 | } |
49 | |