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/* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/my_file.cc
*/
#include "my_config.h"
#include <string.h>
#include <sys/types.h>
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_macros.h"
#include "my_sys.h"
#include "mysql/service_mysql_alloc.h"
#include "mysys/my_static.h"
#include "mysys/mysys_priv.h"
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h> /* RLIMIT_NOFILE */
#endif
/*
set how many open files we want to be able to handle
SYNOPSIS
set_maximum_open_files()
max_file_limit Files to open
NOTES
The request may not fulfilled becasue of system limitations
RETURN
Files available to open.
May be more or less than max_file_limit!
*/
#if defined(HAVE_GETRLIMIT)
/*
This value is certainly wrong on all 64bit platforms,
and also wrong on many 32bit platforms.
It is better to get a compile error, than to use a wrong value.
#ifndef RLIM_INFINITY
#define RLIM_INFINITY ((uint) 0xffffffff)
#endif
*/
static uint set_max_open_files(uint max_file_limit) {
struct rlimit rlimit;
uint old_cur;
DBUG_ENTER("set_max_open_files");
DBUG_PRINT("enter", ("files: %u", max_file_limit));
if (!getrlimit(RLIMIT_NOFILE, &rlimit)) {
old_cur = (uint)rlimit.rlim_cur;
DBUG_PRINT("info", ("rlim_cur: %u rlim_max: %u", (uint)rlimit.rlim_cur,
(uint)rlimit.rlim_max));
if (rlimit.rlim_cur == (rlim_t)RLIM_INFINITY)
rlimit.rlim_cur = max_file_limit;
if (rlimit.rlim_cur >= max_file_limit)
DBUG_RETURN(rlimit.rlim_cur); /* purecov: inspected */
rlimit.rlim_cur = rlimit.rlim_max = max_file_limit;
if (setrlimit(RLIMIT_NOFILE, &rlimit))
max_file_limit = old_cur; /* Use original value */
else {
rlimit.rlim_cur = 0; /* Safety if next call fails */
(void)getrlimit(RLIMIT_NOFILE, &rlimit);
DBUG_PRINT("info", ("rlim_cur: %u", (uint)rlimit.rlim_cur));
if (rlimit.rlim_cur) /* If call didn't fail */
max_file_limit = (uint)rlimit.rlim_cur;
}
}
DBUG_PRINT("exit", ("max_file_limit: %u", max_file_limit));
DBUG_RETURN(max_file_limit);
}
#else
static uint set_max_open_files(uint max_file_limit) {
/* We don't know the limit. Return best guess */
return MY_MIN(max_file_limit, OS_FILE_LIMIT);
}
#endif
/*
Change number of open files
SYNOPSIS:
my_set_max_open_files()
files Number of requested files
RETURN
number of files available for open
*/
uint my_set_max_open_files(uint files) {
struct st_my_file_info *tmp;
DBUG_ENTER("my_set_max_open_files");
DBUG_PRINT("enter", ("files: %u my_file_limit: %u", files, my_file_limit));
files += MY_FILE_MIN;
files = set_max_open_files(MY_MIN(files, OS_FILE_LIMIT));
if (files <= MY_NFILE) DBUG_RETURN(files);
if (!(tmp = (struct st_my_file_info *)my_malloc(
key_memory_my_file_info, sizeof(*tmp) * files, MYF(MY_WME))))
DBUG_RETURN(MY_NFILE);
/* Copy any initialized files */
memcpy((char *)tmp, (char *)my_file_info,
sizeof(*tmp) * MY_MIN(my_file_limit, files));
memset((tmp + my_file_limit), 0,
MY_MAX((int)(files - my_file_limit), 0) * sizeof(*tmp));
my_free_open_file_info(); /* Free if already allocated */
my_file_info = tmp;
my_file_limit = files;
DBUG_PRINT("exit", ("files: %u", files));
DBUG_RETURN(files);
}
void my_free_open_file_info() {
DBUG_ENTER("my_free_file_info");
if (my_file_info != my_file_info_default) {
/* Copy data back for my_print_open_files */
memcpy((char *)my_file_info_default, my_file_info,
sizeof(*my_file_info_default) * MY_NFILE);
my_free(my_file_info);
my_file_info = my_file_info_default;
my_file_limit = MY_NFILE;
}
DBUG_VOID_RETURN;
}
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