mirror of
https://github.com/MariaDB/server.git
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135 lines
3.8 KiB
C
135 lines
3.8 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; version 2 of the License.
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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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#include "mysys_priv.h"
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#include "my_static.h"
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#include <m_string.h>
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/*
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set how many open files we want to be able to handle
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SYNOPSIS
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set_maximum_open_files()
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max_file_limit Files to open
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NOTES
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The request may not fulfilled becasue of system limitations
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RETURN
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Files available to open.
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May be more or less than max_file_limit!
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*/
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#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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#ifndef RLIM_INFINITY
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#define RLIM_INFINITY ((uint) 0xffffffff)
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#endif
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static uint set_max_open_files(uint max_file_limit)
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{
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struct rlimit rlimit;
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uint old_cur;
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DBUG_ENTER("set_max_open_files");
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DBUG_PRINT("enter",("files: %u", max_file_limit));
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if (!getrlimit(RLIMIT_NOFILE,&rlimit))
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{
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old_cur= (uint) rlimit.rlim_cur;
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DBUG_PRINT("info", ("rlim_cur: %u rlim_max: %u",
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(uint) rlimit.rlim_cur,
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(uint) rlimit.rlim_max));
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if (rlimit.rlim_cur == RLIM_INFINITY)
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rlimit.rlim_cur = max_file_limit;
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if (rlimit.rlim_cur >= max_file_limit)
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DBUG_RETURN(rlimit.rlim_cur); /* purecov: inspected */
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rlimit.rlim_cur= rlimit.rlim_max= max_file_limit;
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if (setrlimit(RLIMIT_NOFILE, &rlimit))
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max_file_limit= old_cur; /* Use original value */
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else
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{
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rlimit.rlim_cur= 0; /* Safety if next call fails */
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(void) getrlimit(RLIMIT_NOFILE,&rlimit);
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DBUG_PRINT("info", ("rlim_cur: %u", (uint) rlimit.rlim_cur));
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if (rlimit.rlim_cur) /* If call didn't fail */
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max_file_limit= (uint) rlimit.rlim_cur;
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}
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}
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DBUG_PRINT("exit",("max_file_limit: %u", max_file_limit));
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DBUG_RETURN(max_file_limit);
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}
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#else
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static int set_max_open_files(uint max_file_limit)
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{
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/* We don't know the limit. Return best guess */
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return min(max_file_limit, OS_FILE_LIMIT);
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}
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#endif
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/*
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Change number of open files
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SYNOPSIS:
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my_set_max_open_files()
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files Number of requested files
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RETURN
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number of files available for open
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*/
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uint my_set_max_open_files(uint files)
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{
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struct st_my_file_info *tmp;
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DBUG_ENTER("my_set_max_open_files");
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DBUG_PRINT("enter",("files: %u my_file_limit: %u", files, my_file_limit));
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files= set_max_open_files(min(files, OS_FILE_LIMIT));
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if (files <= MY_NFILE)
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DBUG_RETURN(files);
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if (!(tmp= (struct st_my_file_info*) my_malloc(sizeof(*tmp) * files,
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MYF(MY_WME))))
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DBUG_RETURN(MY_NFILE);
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/* Copy any initialized files */
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memcpy((char*) tmp, (char*) my_file_info,
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sizeof(*tmp) * min(my_file_limit, files));
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bzero((char*) (tmp + my_file_limit),
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max((int) (files- my_file_limit), 0)*sizeof(*tmp));
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my_free_open_file_info(); /* Free if already allocated */
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my_file_info= tmp;
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my_file_limit= files;
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DBUG_PRINT("exit",("files: %u", files));
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DBUG_RETURN(files);
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}
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void my_free_open_file_info()
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{
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DBUG_ENTER("my_free_file_info");
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if (my_file_info != my_file_info_default)
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{
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/* Copy data back for my_print_open_files */
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memcpy((char*) my_file_info_default, my_file_info,
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sizeof(*my_file_info_default)* MY_NFILE);
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my_free((char*) my_file_info, MYF(0));
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my_file_info= my_file_info_default;
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my_file_limit= MY_NFILE;
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}
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DBUG_VOID_RETURN;
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}
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