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c4029823 | 1 | /* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc. |
28f540f4 RM |
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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
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19 | #include <stdio.h> |
20 | #include <unistd.h> | |
21 | #include <errno.h> | |
22 | ||
23 | /* Rename the file OLD to NEW. */ | |
24 | int | |
c4029823 UD |
25 | rename (old, new) |
26 | const char *old; | |
27 | const char *new; | |
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28 | { |
29 | int save = errno; | |
c4029823 | 30 | if (__link (old, new) < 0) |
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31 | { |
32 | if (errno == EEXIST) | |
33 | { | |
34 | errno = save; | |
35 | /* Race condition, required for 1003.1 conformance. */ | |
c4029823 UD |
36 | if (__unlink (new) < 0 || |
37 | __link (old, new) < 0) | |
28f540f4 RM |
38 | return -1; |
39 | } | |
40 | else | |
41 | return -1; | |
42 | } | |
c4029823 | 43 | if (__unlink (old) < 0) |
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44 | { |
45 | save = errno; | |
c4029823 UD |
46 | if (__unlink (new) == 0) |
47 | __set_errno (save); | |
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48 | return -1; |
49 | } | |
50 | return 0; | |
51 | } |