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/*
* getdata24.c -- implementations of kernel 2.4 specific data retrieval functions
*
* software distributed under the GPL, for license terms see the file
* COPYING in this directory
*
* (c) 2005 Dr. Andreas Mueller, Beratung und Entwicklung
* $Id: getdata24.c,v 1.2 2005/09/19 07:20:33 afm Exp $
*/
#include "getdata24.h"
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
/*
The 2.4 kernel keeps disk statistics information in /proc/partitions
in the following format:
major device major number
minor device minor number
#blocks device size in blocks
name device name (without /dev/ prefix)
rio read io operations since boot
rmerge read merges
rsect sector reads
ruse miliseconds the disk was in use
wio write io operations since boot
wmerge write merge operations since boot
wsect sector writes since boot
wuse time disk was in use for write operations
running number of in flight operations
use time in use (read and write)
aveq average queue length (ms) = Integral of number of operations
over time (in ms)
To compute the io statistics for a disk, use the rio and wio operations,
as they are closest to what we used to know as unix io operations. Use
the wsect and rsect numbers to report block reads/writes.
*/
void get_disk24(struct statsusers *s) {
FILE *partitions;
char buffer[128];
unsigned long long rio;
unsigned long long wio;
char line[1024];
char device[128];
int diskno;
/* open the /proc/partitions file */
partitions = fopen("/proc/partitions", "r");
if (NULL == partitions) {
return;
}
/* skip two lines */
fgets(buffer, sizeof(buffer), partitions); /* 1. line */
fgets(buffer, sizeof(buffer), partitions); /* 2. line */
/* accumulate all the io statistics */
diskno = 0;
while ((diskno < 4) && (line == fgets(line, sizeof(line), partitions))) {
sscanf(line, " %*d %*d %*d %s "
"%lld %*d %*d %*d "
"%lld %*d %*d %*d "
"%*d %*d %*d\n",
device, &rio, &wio);
if (isdisk(device)) {
s->dk_xfer[diskno++] = rio + wio;
}
}
/* close the file */
fclose(partitions);
}
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