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99 lines
3.3 KiB
99 lines
3.3 KiB
5 months ago
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/mf_cache.cc
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Open a temporary file and cache it with io_cache. Delete it on close.
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*/
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#include <fcntl.h>
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#include <stddef.h>
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_io.h"
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#include "my_sys.h"
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#include "mysql/psi/mysql_file.h"
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#include "mysql/service_mysql_alloc.h"
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#include "mysys/mysys_priv.h"
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/*
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** Open tempfile cached by IO_CACHE
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** Should be used when no seeks are done (only reinit_io_buff)
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** Return 0 if cache is inited ok
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** The actual file is created when the IO_CACHE buffer gets filled
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** If dir is not given, use TMPDIR.
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*/
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bool open_cached_file(IO_CACHE *cache, const char *dir, const char *prefix,
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size_t cache_size, myf cache_myflags) {
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DBUG_TRACE;
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cache->dir =
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dir ? my_strdup(key_memory_IO_CACHE, dir, MYF(cache_myflags & MY_WME))
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: (char *)0;
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cache->prefix = (prefix ? my_strdup(key_memory_IO_CACHE, prefix,
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MYF(cache_myflags & MY_WME))
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: (char *)0);
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cache->file_name = 0;
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cache->buffer = 0; /* Mark that not open */
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if (!init_io_cache(cache, -1, cache_size, WRITE_CACHE, 0L, 0,
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MYF(cache_myflags | MY_NABP))) {
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return 0;
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}
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my_free(cache->dir);
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my_free(cache->prefix);
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return 1;
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}
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/* Create the temporary file */
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bool real_open_cached_file(IO_CACHE *cache) {
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char name_buff[FN_REFLEN];
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int error = 1;
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DBUG_TRACE;
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if ((cache->file = mysql_file_create_temp(
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cache->file_key, name_buff, cache->dir, cache->prefix,
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(O_RDWR | O_TRUNC), UNLINK_FILE, MYF(MY_WME))) >= 0) {
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error = 0;
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}
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return error;
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}
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void close_cached_file(IO_CACHE *cache) {
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DBUG_TRACE;
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if (my_b_inited(cache)) {
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File file = cache->file;
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cache->file = -1; /* Don't flush data */
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(void)end_io_cache(cache);
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if (file >= 0) {
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(void)mysql_file_close(file, MYF(0));
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}
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my_free(cache->dir);
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my_free(cache->prefix);
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}
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}
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