mirror of
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123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/* Copyright (C) 2000 MySQL AB
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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; either version 2 of the License, or
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(at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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if we crash; If the operating system doesn't support
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this, just remember 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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uint 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 ? my_strdup(dir,MYF(cache_myflags & MY_WME)) : (char*) 0;
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cache->prefix= (prefix ? my_strdup(prefix,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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{
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DBUG_RETURN(0);
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}
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my_free(cache->dir, MYF(MY_ALLOW_ZERO_PTR));
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my_free(cache->prefix,MYF(MY_ALLOW_ZERO_PTR));
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DBUG_RETURN(1);
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}
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/* Create the temporary file */
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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, cache->prefix,
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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,MYF(0));
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}
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#endif
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}
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my_free(cache->dir,MYF(MY_ALLOW_ZERO_PTR));
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my_free(cache->prefix,MYF(MY_ALLOW_ZERO_PTR));
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}
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DBUG_VOID_RETURN;
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}
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