Max open files handling moved to my_set_max_open_files()

This ensures that my_file_info takes this the max number of files into account and one can now use --open-files-limit on windows to increase number of used files up to 2048


client/client_priv.h:
  Added --open-files-limit to mysqlbinlog
client/mysqlbinlog.cc:
  Added --open-files-limit to mysqlbinlog
include/config-win.h:
  Define that you can have up to 2048 files open on windows
include/my_global.h:
  Allow override of OS_FILE_LIMIT
include/my_sys.h:
  Cleanup
  Added prototypes for my_set_max_open_files() and my_free_open_files()
libmysql/Makefile.shared:
  Added my_file.c
myisam/myisamlog.c:
  Use my_set_max_open_files()
mysys/Makefile.am:
  Use my_file.c (for mysqlbinlog)
mysys/my_alloc.c:
  Remove compiler warning
mysys/my_div.c:
  MY_NFILE -> my_file_limit
mysys/my_dup.c:
  MY_NFILE -> my_file_limit
mysys/my_fopen.c:
  MY_NFILE -> my_file_limit
mysys/my_open.c:
  MY_NFILE -> my_file_limit
mysys/my_static.c:
  Allow changing of open files limit
mysys/my_static.h:
  Allow changing of open files limit
sql/mysqld.cc:
  Max open files handling moved to my_set_max_open_files()

1 files changed, 147 insertions, 0 deletions

diff --git a/mysys/my_file.c b/mysys/my_file.c
new file mode 100644
index 00000000000..6a9d39cf944
--- /dev/null
+++ b/mysys/my_file.c
@@ -0,0 +1,147 @@
+/* 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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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 "my_static.h"
+#include <m_string.h>
+
+/*
+  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) && defined(RLIMIT_NOFILE) && !defined(HAVE_mit_thread)
+
+#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_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);
+}
+
+#elif defined (OS2)
+
+static uint set_max_open_files(uint max_file_limit)
+{
+  LONG     cbReqCount;
+  ULONG    cbCurMaxFH0;
+  APIRET   ulrc;
+  DBUG_ENTER("set_max_open_files");
+
+  /* get current limit */
+  cbReqCount = 0;
+  DosSetRelMaxFH( &cbReqCount, &cbCurMaxFH0);
+
+  /* set new limit */
+  if ((cbReqCount = max_file_limit - cbCurMaxFH0) > 0)
+    ulrc = DosSetRelMaxFH( &cbReqCount, &cbCurMaxFH);
+  DBUG_RETURN(cbCurMaxFH0);
+}
+
+#else
+static int set_max_open_files(uint max_file_limit)
+{
+  /* We don't know the limit. Return best guess */
+  return 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= set_max_open_files(min(files, OS_FILE_LIMIT));
+  if (files <= MY_NFILE)
+    DBUG_RETURN(files);
+
+  if (!(tmp= (struct st_my_file_info*) my_malloc(sizeof(*tmp) * files,
+						 MYF(MY_WME))))
+    DBUG_RETURN(MY_NFILE);
+
+  /* Copy any initialized files */
+  memcpy((char*) tmp, (char*) my_file_info, sizeof(*tmp) * my_file_limit);
+  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)
+  {
+    my_free((char*) my_file_info, MYF(0));
+    my_file_info= my_file_info_default;
+  }
+  DBUG_VOID_RETURN;
+}