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/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "mysys_priv.h"
#include <my_dir.h>
#include "mysys_err.h"
#include "m_string.h"
#undef my_rename
#ifdef _WIN32
#define RENAME_MAX_RETRIES 50
/*
On Windows, bad 3rd party programs (backup or anitivirus, or something else)
can have file open with a sharing mode incompatible with renaming, i.e they
won't use FILE_SHARE_DELETE when opening file.
The following function will do a couple of retries, in case MoveFileEx returns
ERROR_SHARING_VIOLATION.
*/
static BOOL win_rename_with_retries(const char *from, const char *to)
{
#ifndef DBUG_OFF
FILE *fp = NULL;
DBUG_EXECUTE_IF("rename_sharing_violation",
{
fp= fopen(from, "r");
DBUG_ASSERT(fp);
}
);
#endif
for (int retry= RENAME_MAX_RETRIES; retry--;)
{
DWORD ret = MoveFileEx(from, to,
MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING);
DBUG_ASSERT(fp == NULL || (ret == FALSE && GetLastError() == ERROR_SHARING_VIOLATION));
if (!ret && (GetLastError() == ERROR_SHARING_VIOLATION))
{
#ifndef DBUG_OFF
/*
If error was injected in via DBUG_EXECUTE_IF, close the file
that is causing ERROR_SHARING_VIOLATION, so that retry succeeds.
*/
if (fp)
{
fclose(fp);
fp= NULL;
}
#endif
Sleep(10);
}
else
return ret;
}
return FALSE;
}
#endif
/* On unix rename deletes to file if it exists */
int my_rename(const char *from, const char *to, myf MyFlags)
{
int error = 0;
DBUG_ENTER("my_rename");
DBUG_PRINT("my",("from %s to %s MyFlags %lu", from, to, MyFlags));
#if defined(_WIN32)
if (!win_rename_with_retries(from, to))
{
my_osmaperr(GetLastError());
#elif defined(HAVE_RENAME)
if (rename(from,to))
{
#else
if (link(from, to) || unlink(from))
{
#endif
if (errno == ENOENT && !access(from, F_OK))
my_errno= ENOTDIR;
else
my_errno= errno;
error = -1;
if (MyFlags & (MY_FAE+MY_WME))
my_error(EE_LINK, MYF(ME_BELL),from,to,my_errno);
}
else if (MyFlags & MY_SYNC_DIR)
{
#ifdef NEED_EXPLICIT_SYNC_DIR
/* do only the needed amount of syncs: */
char dir_from[FN_REFLEN], dir_to[FN_REFLEN];
size_t dir_from_length, dir_to_length;
dirname_part(dir_from, from, &dir_from_length);
dirname_part(dir_to, to, &dir_to_length);
if (my_sync_dir(dir_from, MyFlags) ||
(strcmp(dir_from, dir_to) &&
my_sync_dir(dir_to, MyFlags)))
error= -1;
#endif
}
DBUG_RETURN(error);
} /* my_rename */
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