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196e852983
* remove unused (and not implemented) WRITE_NET type * remove cast in my_b_write() macro. my_b_* macros are function-like, casts are responsibility of the caller * replace hackish _my_b_write(info,0,0) with the explicit my_b_flush_io_cache() in my_b_write_byte() * remove unused my_b_fill_cache() * replace pbool -> my_bool * make internal IO_CACHE functions static * reformat comments, correct typos, remove obsolete comments (ISAM) * assert valid cache type in init_functions() * use IO_ROUND_DN() macro where appropriate * remove unused DBUG_EXECUTE_IF in _my_b_cache_write() * remove unnecessary __attribute__((unused)) * fix goto error in parse_file.cc * remove redundant reinit_io_cache() in uniques.cc * don't do reinit_io_cache() if the cache was not initialized in ma_check.c * extract duplicate functionality from various _my_b_*_read functions into a common wrapper. Same for _my_b_*_write * create _my_b_cache_write_r instead of having if's in _my_b_cache_write (similar to existing _my_b_cache_read and _my_b_cache_read_r) * don't call mysql_file_write() from my_b_flush_io_cache(), call info->write_function() instead
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/* Copyright (c) 2000, 2010, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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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/* Open a temporary file and cache it with io_cache. Delete it on close */
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#include "mysys_priv.h"
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#include <m_string.h>
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#include "my_static.h"
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#include "mysys_err.h"
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/**
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Remove an open tempfile so that it doesn't survive if we crash
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If the operating system doesn't support this, just remember
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the file name for later removal
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*/
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static my_bool cache_remove_open_tmp(IO_CACHE *cache __attribute__((unused)),
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const char *name)
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{
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#if O_TEMPORARY == 0
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#if !defined(CANT_DELETE_OPEN_FILES)
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/* The following should always succeed */
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(void) my_delete(name,MYF(MY_WME | ME_NOINPUT));
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#else
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int length;
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if (!(cache->file_name=
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(char*) my_malloc((length=strlen(name)+1),MYF(MY_WME))))
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{
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my_close(cache->file,MYF(0));
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cache->file = -1;
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errno=my_errno=ENOMEM;
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return 1;
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}
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memcpy(cache->file_name,name,length);
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#endif
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#endif /* O_TEMPORARY == 0 */
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return 0;
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}
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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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my_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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{
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DBUG_ENTER("open_cached_file");
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cache->dir= dir;
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if (prefix)
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{
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DBUG_ASSERT(strlen(prefix) == 2);
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memcpy(cache->prefix, prefix, 3);
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}
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else
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cache->prefix[0]= 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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{
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DBUG_RETURN(0);
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}
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DBUG_RETURN(1);
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}
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/**
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Create the temporary file
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*/
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my_bool real_open_cached_file(IO_CACHE *cache)
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{
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char name_buff[FN_REFLEN];
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int error=1;
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DBUG_ENTER("real_open_cached_file");
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if ((cache->file=create_temp_file(name_buff, cache->dir,
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cache->prefix[0] ? cache->prefix : 0,
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(O_RDWR | O_BINARY | O_TRUNC |
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O_TEMPORARY | O_SHORT_LIVED),
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MYF(MY_WME))) >= 0)
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{
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error=0;
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cache_remove_open_tmp(cache, name_buff);
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}
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DBUG_RETURN(error);
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}
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void close_cached_file(IO_CACHE *cache)
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{
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DBUG_ENTER("close_cached_file");
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if (my_b_inited(cache))
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{
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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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{
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(void) my_close(file,MYF(0));
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#ifdef CANT_DELETE_OPEN_FILES
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if (cache->file_name)
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{
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(void) my_delete(cache->file_name,MYF(MY_WME | ME_NOINPUT));
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my_free(cache->file_name);
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}
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#endif
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}
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}
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DBUG_VOID_RETURN;
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}
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