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/* $Id: plugin_diskstats.c,v 1.2 2004/05/29 01:07:56 reinelt Exp $
*
* plugin for /proc/diskstats parsing
*
* Copyright 2003 Michael Reinelt <reinelt@eunet.at>
* Copyright 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.
*
*
* $Log: plugin_diskstats.c,v $
* Revision 1.2 2004/05/29 01:07:56 reinelt
* bug in plugin_diskstats fixed
*
* Revision 1.1 2004/05/29 00:27:23 reinelt
*
* added plugin_diskstats.c
*
*/
/*
* 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 "qprintf.h"
#include "hash.h"
static HASH DISKSTATS = { 0, };
static FILE *stream = NULL;
static void hash_set2 (char *key1, char *key2, char *val)
{
char key[32];
qprintf(key, sizeof(key), "%s.%s", key1, key2);
hash_set_delta (&DISKSTATS, key, val);
}
static int parse_diskstats (void)
{
int age;
// reread every 10 msec only
age = hash_age(&DISKSTATS, NULL, 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 *beg, *end;
char *major = NULL;
char *minor = NULL;
char *name = NULL;
char *key[] = { "reads", "read_merges", "read_sectors", "read_ticks",
"writes", "write_merges", "write_sectors", "write_ticks",
"in_flight", "io_ticks", "time_in_queue"
};
int i;
if (fgets (buffer, sizeof(buffer), stream) == NULL) break;
beg = buffer;
i = 0;
while (beg != NULL) {
while (*beg == ' ') beg++;
if ((end = strchr(beg, ' '))) *end = '\0';
switch (i) {
case 0:
major = beg;
break;
case 1:
minor = beg;
break;
case 2:
name = beg;
hash_set2 (name, "major", major);
hash_set2 (name, "minor", minor);
break;
default:
hash_set2 (name, key[i-3], beg);
}
i++;
beg = end ? end+1 : NULL;
}
}
return 0;
}
static void my_diskstats (RESULT *result, RESULT *arg1, RESULT *arg2, RESULT *arg3)
{
char *dev, *key, buffer[32];
int delay;
double value;
if (parse_diskstats() < 0) {
SetResult(&result, R_STRING, "");
return;
}
dev = R2S(arg1);
key = R2S(arg2);
delay = R2N(arg3);
qprintf(buffer, sizeof(buffer), "%s\\.%s", dev, key);
value = hash_get_regex(&DISKSTATS, buffer, delay);
SetResult(&result, R_NUMBER, &value);
}
int plugin_init_diskstats (void)
{
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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