mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 04:22:27 +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
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/* Copyright (C) 2000 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 */
|
|
|
|
#include "mysys_priv.h"
|
|
#include "mysys_err.h"
|
|
#include "m_string.h"
|
|
|
|
/*
|
|
Change size of file.
|
|
|
|
SYNOPSIS
|
|
my_chsize()
|
|
fd File descriptor
|
|
new_length New file size
|
|
filler If we don't have truncate, fill up all bytes after
|
|
new_length with this character
|
|
MyFlags Flags
|
|
|
|
DESCRIPTION
|
|
my_chsize() truncates file if shorter else fill with the filler character.
|
|
The function also changes the file pointer. Usually it points to the end
|
|
of the file after execution.
|
|
|
|
RETURN VALUE
|
|
0 Ok
|
|
1 Error
|
|
*/
|
|
int my_chsize(File fd, my_off_t newlength, int filler, myf MyFlags)
|
|
{
|
|
my_off_t oldsize;
|
|
uchar buff[IO_SIZE];
|
|
DBUG_ENTER("my_chsize");
|
|
DBUG_PRINT("my",("fd: %d length: %lu MyFlags: %d",fd,(ulong) newlength,
|
|
MyFlags));
|
|
|
|
if ((oldsize= my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE))) == newlength)
|
|
DBUG_RETURN(0);
|
|
|
|
DBUG_PRINT("info",("old_size: %ld", (ulong) oldsize));
|
|
|
|
if (oldsize > newlength)
|
|
{
|
|
#ifdef _WIN32
|
|
if (my_win_chsize(fd, newlength))
|
|
{
|
|
my_errno= errno;
|
|
goto err;
|
|
}
|
|
DBUG_RETURN(0);
|
|
#elif defined(HAVE_FTRUNCATE)
|
|
if (ftruncate(fd, (off_t) newlength))
|
|
{
|
|
my_errno= errno;
|
|
goto err;
|
|
}
|
|
DBUG_RETURN(0);
|
|
#elif defined(HAVE_CHSIZE)
|
|
if (chsize(fd, (off_t) newlength))
|
|
{
|
|
my_errno=errno;
|
|
goto err;
|
|
}
|
|
DBUG_RETURN(0);
|
|
#else
|
|
/*
|
|
Fill space between requested length and true length with 'filler'
|
|
We should never come here on any modern machine
|
|
*/
|
|
if (my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE))
|
|
== MY_FILEPOS_ERROR)
|
|
{
|
|
goto err;
|
|
}
|
|
swap_variables(my_off_t, newlength, oldsize);
|
|
#endif
|
|
}
|
|
|
|
/* Full file with 'filler' until it's as big as requested */
|
|
bfill(buff, IO_SIZE, filler);
|
|
while (newlength-oldsize > IO_SIZE)
|
|
{
|
|
if (my_write(fd, buff, IO_SIZE, MYF(MY_NABP)))
|
|
goto err;
|
|
oldsize+= IO_SIZE;
|
|
}
|
|
if (my_write(fd,buff,(size_t) (newlength-oldsize), MYF(MY_NABP)))
|
|
goto err;
|
|
DBUG_RETURN(0);
|
|
|
|
err:
|
|
DBUG_PRINT("error", ("errno: %d", errno));
|
|
if (MyFlags & MY_WME)
|
|
my_error(EE_CANT_CHSIZE, MYF(ME_BELL+ME_WAITTANG), my_errno);
|
|
DBUG_RETURN(1);
|
|
} /* my_chsize */
|