mirror of
https://github.com/MariaDB/server.git
synced 2025-02-01 19:41:47 +01:00
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*-
|
|
* See the file LICENSE for redistribution information.
|
|
*
|
|
* Copyright (c) 1997-2005
|
|
* Sleepycat Software. All rights reserved.
|
|
*
|
|
* $Id: os_unlink.c,v 12.7 2005/10/20 18:57:08 bostic Exp $
|
|
*/
|
|
|
|
#include "db_config.h"
|
|
|
|
#ifndef NO_SYSTEM_INCLUDES
|
|
#include <sys/types.h>
|
|
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#include "db_int.h"
|
|
|
|
/*
|
|
* __os_region_unlink --
|
|
* Remove a shared memory object file.
|
|
*/
|
|
int
|
|
__os_region_unlink(dbenv, path)
|
|
DB_ENV *dbenv;
|
|
const char *path;
|
|
{
|
|
if (F_ISSET(dbenv, DB_ENV_OVERWRITE))
|
|
(void)__db_file_multi_write(dbenv, path);
|
|
|
|
return (__os_unlink(dbenv, path));
|
|
}
|
|
|
|
/*
|
|
* __os_unlink --
|
|
* Remove a file.
|
|
*
|
|
* PUBLIC: int __os_unlink __P((DB_ENV *, const char *));
|
|
*/
|
|
int
|
|
__os_unlink(dbenv, path)
|
|
DB_ENV *dbenv;
|
|
const char *path;
|
|
{
|
|
HANDLE h;
|
|
_TCHAR *tpath, *orig_tpath, buf[MAXPATHLEN];
|
|
u_int32_t id;
|
|
int ret;
|
|
|
|
if (DB_GLOBAL(j_unlink) != NULL) {
|
|
ret = DB_GLOBAL(j_unlink)(path);
|
|
goto done;
|
|
}
|
|
|
|
TO_TSTRING(dbenv, path, tpath, ret);
|
|
if (ret != 0)
|
|
return (ret);
|
|
orig_tpath = tpath;
|
|
|
|
/*
|
|
* Windows NT and its descendents allow removal of open files, but the
|
|
* DeleteFile Win32 system call isn't equivalent to a POSIX unlink.
|
|
* Firstly, it only succeeds if FILE_SHARE_DELETE is set when the file
|
|
* is opened. Secondly, it leaves the file in a "zombie" state, where
|
|
* it can't be opened again, but a new file with the same name can't be
|
|
* created either.
|
|
*
|
|
* Since we depend on being able to recreate files (during recovery,
|
|
* say), we have to first rename the file, and then delete it. It
|
|
* still hangs around, but with a name we don't care about. The rename
|
|
* will fail if the file doesn't exist, which isn't a problem, but if
|
|
* it fails for some other reason, we need to know about it or a
|
|
* subsequent open may fail for no apparent reason.
|
|
*/
|
|
if (__os_is_winnt()) {
|
|
__os_unique_id(dbenv, &id);
|
|
_sntprintf(buf, MAXPATHLEN, _T("%s.del.%010u"), tpath, id);
|
|
if (MoveFile(tpath, buf))
|
|
tpath = buf;
|
|
else if (__os_get_errno() != ENOENT)
|
|
__db_err(dbenv,
|
|
"unlink: rename %s to temporary file failed", path);
|
|
|
|
/*
|
|
* Try removing the file using the delete-on-close flag. This
|
|
* plays nicer with files that are still open than DeleteFile.
|
|
*/
|
|
h = CreateFile(tpath, 0, FILE_SHARE_READ, NULL, OPEN_EXISTING,
|
|
FILE_FLAG_DELETE_ON_CLOSE, 0);
|
|
if (h != INVALID_HANDLE_VALUE) {
|
|
(void)CloseHandle (h);
|
|
if (GetFileAttributes(tpath) == INVALID_FILE_ATTRIBUTES)
|
|
goto skipdel;
|
|
}
|
|
}
|
|
|
|
RETRY_CHK((!DeleteFile(tpath)), ret);
|
|
|
|
skipdel:
|
|
FREE_STRING(dbenv, orig_tpath);
|
|
|
|
/*
|
|
* XXX
|
|
* We shouldn't be testing for an errno of ENOENT here, but ENOENT
|
|
* signals that a file is missing, and we attempt to unlink things
|
|
* (such as v. 2.x environment regions, in DB_ENV->remove) that we
|
|
* are expecting not to be there. Reporting errors in these cases
|
|
* is annoying.
|
|
*/
|
|
done: if (ret != 0 && ret != ENOENT)
|
|
__db_err(dbenv, "unlink: %s: %s", path, strerror(ret));
|
|
|
|
return (ret);
|
|
}
|