1
/* Copyright (C) 2000 MySQL AB
3
This program is free software; you can redistribute it and/or modify
4
it under the terms of the GNU General Public License as published by
5
the Free Software Foundation; version 2 of the License.
7
This program is distributed in the hope that it will be useful,
8
but WITHOUT ANY WARRANTY; without even the implied warranty of
9
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10
GNU General Public License for more details.
12
You should have received a copy of the GNU General Public License
13
along with this program; if not, write to the Free Software
14
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
16
#include "mysys_priv.h"
17
#include "my_static.h"
18
#include <mystrings/m_string.h>
23
set how many open files we want to be able to handle
26
set_maximum_open_files()
27
max_file_limit Files to open
30
The request may not fulfilled becasue of system limitations
33
Files available to open.
34
May be more or less than max_file_limit!
37
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
40
#define RLIM_INFINITY ((uint) 0xffffffff)
43
static uint32_t set_max_open_files(uint32_t max_file_limit)
48
if (!getrlimit(RLIMIT_NOFILE,&rlimit))
50
old_cur= rlimit.rlim_cur;
51
if (rlimit.rlim_cur == RLIM_INFINITY)
52
rlimit.rlim_cur = max_file_limit;
53
if (rlimit.rlim_cur >= max_file_limit)
55
if (rlimit.rlim_cur > UINT32_MAX)
58
return((uint32_t)rlimit.rlim_cur);
60
rlimit.rlim_cur= rlimit.rlim_max= max_file_limit;
61
if (setrlimit(RLIMIT_NOFILE, &rlimit))
62
max_file_limit= (old_cur < UINT32_MAX) ? (uint32_t)old_cur : UINT32_MAX;
65
rlimit.rlim_cur= 0; /* Safety if next call fails */
66
(void) getrlimit(RLIMIT_NOFILE,&rlimit);
67
if (rlimit.rlim_cur) /* If call didn't fail */
68
max_file_limit= (uint32_t) rlimit.rlim_cur;
71
return(max_file_limit);
75
static int set_max_open_files(uint32_t max_file_limit)
77
/* We don't know the limit. Return best guess */
78
return cmin(max_file_limit, OS_FILE_LIMIT);
84
Change number of open files
87
my_set_max_open_files()
88
files Number of requested files
91
number of files available for open
94
uint32_t my_set_max_open_files(uint32_t files)
96
struct st_my_file_info *tmp;
98
files= set_max_open_files(cmin(files, OS_FILE_LIMIT));
99
if (files <= MY_NFILE)
102
if (!(tmp= (st_my_file_info*) malloc(sizeof(st_my_file_info) * files)))
105
/* Copy any initialized files */
106
memcpy(tmp, my_file_info, sizeof(*tmp) * cmin(my_file_limit, files));
108
The int cast is necessary since 'my_file_limits' might be greater
111
memset(tmp + my_file_limit, 0,
112
cmax((int) (files - my_file_limit), 0)*sizeof(*tmp));
113
my_free_open_file_info(); /* Free if already allocated */
115
my_file_limit= files;
120
void my_free_open_file_info()
122
if (my_file_info != my_file_info_default)
124
/* Copy data back for my_print_open_files */
125
memcpy(my_file_info_default, my_file_info,
126
sizeof(*my_file_info_default)* MY_NFILE);
127
free((char*) my_file_info);
128
my_file_info= my_file_info_default;
129
my_file_limit= MY_NFILE;