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/* $Id: plugin_diskstats.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_diskstats.c $
*
* plugin for /proc/diskstats parsing
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int plugin_init_diskstats (void)
* adds functions to access /proc/stat
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "debug.h"
#include "plugin.h"
#include "hash.h"
static HASH DISKSTATS;
static FILE *stream = NULL;
static int parse_diskstats(void)
{
int age;
/* reread every 10 msec only */
age = hash_age(&DISKSTATS, NULL);
if (age > 0 && age <= 10)
return 0;
if (stream == NULL)
stream = fopen("/proc/diskstats", "r");
if (stream == NULL) {
error("fopen(/proc/diskstats) failed: %s", strerror(errno));
return -1;
}
rewind(stream);
while (!feof(stream)) {
char buffer[1024];
char dev[64];
char *beg, *end;
unsigned int num, len;
if (fgets(buffer, sizeof(buffer), stream) == NULL)
break;
/* fetch device name (3rd column) as key */
num = 0;
beg = buffer;
end = beg;
while (*beg) {
while (*beg == ' ')
beg++;
end = beg + 1;
while (*end && *end != ' ')
end++;
if (num++ == 2)
break;
beg = end ? end + 1 : NULL;
}
len = end ? (unsigned) (end - beg) : strlen(beg);
if (len >= sizeof(dev))
len = sizeof(dev) - 1;
strncpy(dev, beg, len);
dev[len] = '\0';
hash_put_delta(&DISKSTATS, dev, buffer);
}
return 0;
}
static void my_diskstats(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
{
char *dev, *key;
int delay;
double value;
if (parse_diskstats() < 0) {
SetResult(&result, R_STRING, "");
return;
}
dev = R2S(arg1);
key = R2S(arg2);
delay = R2N(arg3);
value = hash_get_regex(&DISKSTATS, dev, key, delay);
SetResult(&result, R_NUMBER, &value);
}
int plugin_init_diskstats(void)
{
int i;
char *header[] = { "major", "minor", "name",
"reads", "read_merges", "read_sectors", "read_ticks",
"writes", "write_merges", "write_sectors", "write_ticks",
"in_flight", "io_ticks", "time_in_queue", ""
};
hash_create(&DISKSTATS);
hash_set_delimiter(&DISKSTATS, " \n");
for (i = 0; *header[i] != '\0'; i++) {
hash_set_column(&DISKSTATS, i, header[i]);
}
AddFunction("diskstats", 3, my_diskstats);
return 0;
}
void plugin_exit_diskstats(void)
{
if (stream != NULL) {
fclose(stream);
stream = NULL;
}
hash_destroy(&DISKSTATS);
}
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