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/* Copyright (c) 2000, 2016, 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, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
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, version 2.0, 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 02110-1301 USA */
/**
@file mysys/my_delete.cc
*/
#include "my_config.h"
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_sys.h"
#include "my_thread_local.h"
#include "mysys_err.h"
int my_delete(const char *name, myf MyFlags) {
int err;
DBUG_ENTER("my_delete");
DBUG_PRINT("my", ("name %s MyFlags %d", name, MyFlags));
if ((err = unlink(name)) == -1) {
set_my_errno(errno);
if (MyFlags & (MY_FAE + MY_WME)) {
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_DELETE, MYF(0), name, errno,
my_strerror(errbuf, sizeof(errbuf), errno));
}
} else if ((MyFlags & MY_SYNC_DIR) && my_sync_dir_by_file(name, MyFlags))
err = -1;
DBUG_RETURN(err);
} /* my_delete */
#if defined(_WIN32)
/**
Delete file which is possibly not closed.
This function is intended to be used exclusively as a temporal solution
for Win NT in case when it is needed to delete a not closed file (note
that the file must be opened everywhere with FILE_SHARE_DELETE mode).
Deleting not-closed files can not be supported on Win 98|ME (and because
of that is considered harmful).
The function deletes the file with its preliminary renaming. This is
because when not-closed share-delete file is deleted it still lives on
a disk until it will not be closed everwhere. This may conflict with an
attempt to create a new file with the same name. The deleted file is
renamed to <name>.<num>.deleted where <name> - the initial name of the
file, <num> - a hexadecimal number chosen to make the temporal name to
be unique.
@param the name of the being deleted file
@param the flags instructing how to react on an error internally in
the function
@note The per-thread @c my_errno holds additional info for a caller to
decide how critical the error can be.
@retval
0 ok
@retval
1 error
*/
int nt_share_delete(const char *name, myf MyFlags) {
char buf[MAX_PATH + 20];
ulong cnt;
DBUG_ENTER("nt_share_delete");
DBUG_PRINT("my", ("name %s MyFlags %d", name, MyFlags));
for (cnt = GetTickCount(); cnt; cnt--) {
errno = 0;
sprintf(buf, "%s.%08X.deleted", name, cnt);
if (MoveFile(name, buf)) break;
if ((errno = GetLastError()) == ERROR_ALREADY_EXISTS) continue;
/* This happened during tests with MERGE tables. */
if (errno == ERROR_ACCESS_DENIED) continue;
DBUG_PRINT("warning",
("Failed to rename %s to %s, errno: %d", name, buf, errno));
break;
}
if (errno == ERROR_FILE_NOT_FOUND) {
set_my_errno(ENOENT); // marking, that `name' doesn't exist
} else if (errno == 0) {
if (DeleteFile(buf)) DBUG_RETURN(0);
/*
The below is more complicated than necessary. For some reason, the
assignment to my_errno clears the error number, which is retrieved
by GetLastError() (VC2005EE). Assigning to errno first, allows to
retrieve the correct value.
*/
errno = GetLastError();
if (errno == 0)
set_my_errno(ENOENT); // marking, that `buf' doesn't exist
else
set_my_errno(errno);
} else
set_my_errno(errno);
if (MyFlags & (MY_FAE + MY_WME)) {
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_DELETE, MYF(0), name, my_errno(),
my_strerror(errbuf, sizeof(errbuf), my_errno()));
}
DBUG_RETURN(-1);
}
#endif
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