| /* Copyright (C) 1991-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <errno.h> |
| |
| /* Rename the file OLD to NEW. */ |
| int |
| rename (const char *old, const char *new) |
| { |
| int save = errno; |
| if (__link (old, new) < 0) |
| { |
| if (errno == EEXIST) |
| { |
| __set_errno (save); |
| /* Race condition, required for 1003.1 conformance. */ |
| if (__unlink (new) < 0 || |
| __link (old, new) < 0) |
| return -1; |
| } |
| else |
| return -1; |
| } |
| if (__unlink (old) < 0) |
| { |
| save = errno; |
| if (__unlink (new) == 0) |
| __set_errno (save); |
| return -1; |
| } |
| return 0; |
| } |