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/* Copyright (C) 1991-2019 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
<https://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;
}
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