mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 12:02:42 +01:00
4171483b53
The patch replaces the use of the POSIX I/O interfaces in mysys on Windows with the Win32 API calls (CreateFile, WriteFile, etc). The Windows HANDLE for the open file is stored in the my_file_info struct, along with a flag for append mode (because the Windows API does not support opening files in append mode in all cases) The default max open files has been increased to 16384 and can be increased further by setting --max-open-files=<value> during the server start. Noteworthy benefit of this patch is that it removes limits from the table_cache size - allowing for more simultaneus users
129 lines
3 KiB
C++
129 lines
3 KiB
C++
/* Copyright (C) 2004 MySQL AB
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
|
|
/**
|
|
@file
|
|
|
|
@brief
|
|
Functions for discover of frm file from handler
|
|
*/
|
|
|
|
#include "mysql_priv.h"
|
|
#include <my_dir.h>
|
|
|
|
/**
|
|
Read the contents of a .frm file.
|
|
|
|
frmdata and len are set to 0 on error.
|
|
|
|
@param name path to table-file "db/name"
|
|
@param frmdata frm data
|
|
@param len length of the read frmdata
|
|
|
|
@retval
|
|
0 ok
|
|
@retval
|
|
1 Could not open file
|
|
@retval
|
|
2 Could not stat file
|
|
@retval
|
|
3 Could not allocate data for read. Could not read file
|
|
*/
|
|
|
|
int readfrm(const char *name, uchar **frmdata, size_t *len)
|
|
{
|
|
int error;
|
|
char index_file[FN_REFLEN];
|
|
File file;
|
|
size_t read_len;
|
|
uchar *read_data;
|
|
MY_STAT state;
|
|
DBUG_ENTER("readfrm");
|
|
DBUG_PRINT("enter",("name: '%s'",name));
|
|
|
|
*frmdata= NULL; // In case of errors
|
|
*len= 0;
|
|
error= 1;
|
|
if ((file=my_open(fn_format(index_file,name,"",reg_ext,
|
|
MY_UNPACK_FILENAME|MY_APPEND_EXT),
|
|
O_RDONLY | O_SHARE,
|
|
MYF(0))) < 0)
|
|
goto err_end;
|
|
|
|
// Get length of file
|
|
error= 2;
|
|
if (my_fstat(file, &state, MYF(0)))
|
|
goto err;
|
|
read_len= (size_t)state.st_size;
|
|
|
|
// Read whole frm file
|
|
error= 3;
|
|
read_data= 0; // Nothing to free
|
|
if (read_string(file, &read_data, read_len))
|
|
goto err;
|
|
|
|
// Setup return data
|
|
*frmdata= (uchar*) read_data;
|
|
*len= read_len;
|
|
error= 0;
|
|
|
|
err:
|
|
if (file > 0)
|
|
VOID(my_close(file,MYF(MY_WME)));
|
|
|
|
err_end: /* Here when no file */
|
|
DBUG_RETURN (error);
|
|
} /* readfrm */
|
|
|
|
|
|
/*
|
|
Write the content of a frm data pointer
|
|
to a frm file.
|
|
|
|
@param name path to table-file "db/name"
|
|
@param frmdata frm data
|
|
@param len length of the frmdata
|
|
|
|
@retval
|
|
0 ok
|
|
@retval
|
|
2 Could not write file
|
|
*/
|
|
|
|
int writefrm(const char *name, const uchar *frmdata, size_t len)
|
|
{
|
|
File file;
|
|
char index_file[FN_REFLEN];
|
|
int error;
|
|
DBUG_ENTER("writefrm");
|
|
DBUG_PRINT("enter",("name: '%s' len: %lu ",name, (ulong) len));
|
|
|
|
error= 0;
|
|
if ((file=my_create(fn_format(index_file,name,"",reg_ext,
|
|
MY_UNPACK_FILENAME|MY_APPEND_EXT),
|
|
CREATE_MODE,O_RDWR | O_TRUNC,MYF(MY_WME))) >= 0)
|
|
{
|
|
if (my_write(file, frmdata, len,MYF(MY_WME | MY_NABP)))
|
|
error= 2;
|
|
VOID(my_close(file,MYF(0)));
|
|
}
|
|
DBUG_RETURN(error);
|
|
} /* writefrm */
|
|
|
|
|
|
|
|
|
|
|