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-rw-r--r--mysys/my_file.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/mysys/my_file.c b/mysys/my_file.c
new file mode 100644
index 00000000..c2b358f5
--- /dev/null
+++ b/mysys/my_file.c
@@ -0,0 +1,136 @@
+/*
+ Copyright (c) 2000, 2010, Oracle and/or its affiliates
+
+ 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 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)
+
+#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 ((ulonglong) rlimit.rlim_cur == (ulonglong) RLIM_INFINITY ||
+ rlimit.rlim_cur >= max_file_limit)
+ DBUG_RETURN(max_file_limit);
+ 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));
+ bzero((char*) (tmp + my_file_limit),
+ 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;
+}