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conky/src/diskio.c

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/*
* Conky, a system monitor, based on torsmo
*
* Any original torsmo code is licensed under the BSD license
*
* All code written since the fork of torsmo is licensed under the GPL
*
* Please see COPYING for details
*
* Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
* Copyright (c) 2005-2008 Brenden Matthews, Philip Kovacs, et. al.
* (see AUTHORS)
* All rights reserved.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "config.h"
#include "conky.h" /* text_buffer_size */
#include "logging.h"
#include "diskio.h"
#include "common.h"
#include <stdlib.h>
#include <limits.h>
/* The following ifdefs were adapted from gkrellm */
#include <linux/major.h>
#if !defined(MD_MAJOR)
#define MD_MAJOR 9
#endif
#if !defined(LVM_BLK_MAJOR)
#define LVM_BLK_MAJOR 58
#endif
#if !defined(NBD_MAJOR)
#define NBD_MAJOR 43
#endif
static struct diskio_stat diskio_stats_[MAX_DISKIO_STATS];
struct diskio_stat *diskio_stats = diskio_stats_;
void clear_diskio_stats(void)
{
unsigned i;
for(i = 1; i < MAX_DISKIO_STATS; i++) {
if (diskio_stats[i].dev) {
free(diskio_stats[i].dev);
diskio_stats[i].dev = 0;
}
}
}
struct diskio_stat *prepare_diskio_stat(const char *s)
{
struct diskio_stat *new = 0;
unsigned i;
if (!s)
return &diskio_stats[0];
/* lookup existing or get new */
for (i = 1; i < MAX_DISKIO_STATS; i++) {
if (diskio_stats[i].dev) {
if (strcmp(diskio_stats[i].dev, s) == 0) {
return &diskio_stats[i];
}
} else {
new = &diskio_stats[i];
break;
}
}
/* new dev */
if (!new) {
ERR("too many diskio stats");
return 0;
}
if (new->dev) {
free(new->dev);
new->dev = 0;
}
new->dev = strndup(s, text_buffer_size);
new->current = 0;
new->current_read = 0;
new ->current_write = 0;
new->last = UINT_MAX;
new->last_read = UINT_MAX;
new->last_write = UINT_MAX;
return new;
}
void update_diskio(void)
{
static unsigned int last = UINT_MAX;
static unsigned int last_read = UINT_MAX;
static unsigned int last_write = UINT_MAX;
FILE *fp;
static int rep = 0;
char buf[512], devbuf[64];
int i;
unsigned int major, minor;
unsigned int current = 0;
unsigned int current_read = 0;
unsigned int current_write = 0;
unsigned int reads, writes = 0;
int col_count = 0;
int tot, tot_read, tot_write;
if (!(fp = open_file("/proc/diskstats", &rep))) {
diskio_stats[0].current = 0;
return;
}
/* read reads and writes from all disks (minor = 0), including cd-roms
* and floppies, and sum them up */
while (fgets(buf, 512, fp)) {
col_count = sscanf(buf, "%u %u %s %*u %*u %u %*u %*u %*u %u", &major,
&minor, devbuf, &reads, &writes);
/* ignore subdevices (they have only 3 matching entries in their line)
* and virtual devices (LVM, network block devices, RAM disks, Loopback)
*
* XXX: ignore devices which are part of a SW RAID (MD_MAJOR) */
if (col_count == 5 && major != LVM_BLK_MAJOR && major != NBD_MAJOR
&& major != RAMDISK_MAJOR && major != LOOP_MAJOR) {
current += reads + writes;
current_read += reads;
current_write += writes;
} else {
col_count = sscanf(buf, "%u %u %s %*u %u %*u %u",
&major, &minor, devbuf, &reads, &writes);
if (col_count != 5) {
continue;
}
}
for (i = 1; i < MAX_DISKIO_STATS; i++) {
if (diskio_stats[i].dev && !strcmp(devbuf, diskio_stats[i].dev)) {
diskio_stats[i].current =
(reads + writes - diskio_stats[i].last) / 2;
diskio_stats[i].current_read =
(reads - diskio_stats[i].last_read) / 2;
diskio_stats[i].current_write =
(writes - diskio_stats[i].last_write) / 2;
if (reads + writes < diskio_stats[i].last) {
diskio_stats[i].current = 0;
}
if (reads < diskio_stats[i].last_read) {
diskio_stats[i].current_read = 0;
diskio_stats[i].current = diskio_stats[i].current_write;
}
if (writes < diskio_stats[i].last_write) {
diskio_stats[i].current_write = 0;
diskio_stats[i].current = diskio_stats[i].current_read;
}
diskio_stats[i].last = reads + writes;
diskio_stats[i].last_read = reads;
diskio_stats[i].last_write = writes;
}
}
}
/* since the values in /proc/diststats are absolute, we have to substract
* our last reading. The numbers stand for "sectors read", and we therefore
* have to divide by two to get KB */
tot = ((double) (current - last) / 2);
tot_read = ((double) (current_read - last_read) / 2);
tot_write = ((double) (current_write - last_write) / 2);
if (last_read > current_read) {
tot_read = 0;
}
if (last_write > current_write) {
tot_write = 0;
}
if (last > current) {
/* we hit this either if it's the very first time we run this, or
* when /proc/diskstats overflows; while 0 is not correct, it's at
* least not way off */
tot = 0;
}
last = current;
last_read = current_read;
last_write = current_write;
diskio_stats[0].current = tot;
diskio_stats[0].current_read = tot_read;
diskio_stats[0].current_write = tot_write;
fclose(fp);
}