OpenBSD-4.6/usr.sbin/iostat/iostat.c
/* $OpenBSD: iostat.c,v 1.25 2007/02/18 20:41:34 jmc Exp $ */
/* $NetBSD: iostat.c,v 1.10 1996/10/25 18:21:58 scottr Exp $ */
/*
* Copyright (c) 1996 John M. Vinopal
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by John M. Vinopal.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*-
* Copyright (c) 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1986, 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)iostat.c 8.2 (Berkeley) 1/26/94";
#else
static char *rcsid = "$NetBSD: iostat.c,v 1.10 1996/10/25 18:21:58 scottr Exp $"
;
#endif
#endif /* not lint */
#include <sys/dkstat.h>
#include <sys/time.h>
#include <err.h>
#include <ctype.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <kvm.h>
#include "dkstats.h"
/* Defined in dkstats.c */
extern struct _disk cur, last;
extern int dk_ndrive;
/* Namelist and memory files. */
kvm_t *kd;
char *nlistf, *memf;
int hz, reps, interval;
static int todo = 0;
volatile sig_atomic_t wantheader;
#define ISSET(x, a) ((x) & (a))
#define SHOW_CPU 0x0001
#define SHOW_TTY 0x0002
#define SHOW_STATS_1 0x0004
#define SHOW_STATS_2 0x0008
#define SHOW_TOTALS 0x0080
static void cpustats(void);
static void disk_stats(double);
static void disk_stats2(double);
static void sigheader(int);
static void header(void);
static void usage(void);
static void display(void);
static void selectdrives(char **);
void dkswap(void);
void dkreadstats(void);
int dkinit(int);
int
main(int argc, char *argv[])
{
int ch, hdrcnt;
struct timeval tv;
while ((ch = getopt(argc, argv, "Cc:dDIM:N:Tw:")) != -1)
switch(ch) {
case 'c':
if ((reps = atoi(optarg)) <= 0)
errx(1, "repetition count <= 0.");
break;
case 'C':
todo |= SHOW_CPU;
break;
case 'd':
todo |= SHOW_STATS_1;
break;
case 'D':
todo |= SHOW_STATS_2;
break;
case 'I':
todo |= SHOW_TOTALS;
break;
case 'M':
memf = optarg;
break;
case 'N':
nlistf = optarg;
break;
case 'T':
todo |= SHOW_TTY;
break;
case 'w':
if ((interval = atoi(optarg)) <= 0)
errx(1, "interval <= 0.");
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (!ISSET(todo, SHOW_CPU | SHOW_TTY | SHOW_STATS_1 | SHOW_STATS_2))
todo |= SHOW_CPU | SHOW_TTY | SHOW_STATS_1;
dkinit(0);
dkreadstats();
selectdrives(argv);
tv.tv_sec = interval;
tv.tv_usec = 0;
/* print a new header on sigcont */
(void)signal(SIGCONT, sigheader);
for (hdrcnt = 1;;) {
if (!--hdrcnt || wantheader) {
header();
hdrcnt = 20;
wantheader = 0;
}
if (!ISSET(todo, SHOW_TOTALS))
dkswap();
display();
if (reps >= 0 && --reps <= 0)
break;
select(0, NULL, NULL, NULL, &tv);
dkreadstats();
if (last.dk_ndrive != cur.dk_ndrive)
wantheader = 1;
}
exit(0);
}
/*ARGSUSED*/
static void
sigheader(int signo)
{
wantheader = 1;
}
static void
header(void)
{
int i;
/* Main Headers. */
if (ISSET(todo, SHOW_TTY))
(void)printf(" tty");
if (ISSET(todo, SHOW_STATS_1))
for (i = 0; i < dk_ndrive; i++)
if (cur.dk_select[i])
(void)printf(" %14.14s ", cur.dk_name[i]);
if (ISSET(todo, SHOW_STATS_2))
for (i = 0; i < dk_ndrive; i++)
if (cur.dk_select[i])
(void)printf(" %13.13s ", cur.dk_name[i]);
if (ISSET(todo, SHOW_CPU))
(void)printf(" cpu");
printf("\n");
/* Sub-Headers. */
if (ISSET(todo, SHOW_TTY))
printf(" tin tout");
if (ISSET(todo, SHOW_STATS_1))
for (i = 0; i < dk_ndrive; i++)
if (cur.dk_select[i]) {
if (ISSET(todo, SHOW_TOTALS))
(void)printf(" KB/t xfr MB ");
else
(void)printf(" KB/t t/s MB/s ");
}
if (ISSET(todo, SHOW_STATS_2))
for (i = 0; i < dk_ndrive; i++)
if (cur.dk_select[i]) {
(void)printf(" KB xfr time ");
}
if (ISSET(todo, SHOW_CPU))
(void)printf(" us ni sy in id");
printf("\n");
}
static void
disk_stats(double etime)
{
int dn;
double atime, mbps;
for (dn = 0; dn < dk_ndrive; ++dn) {
if (!cur.dk_select[dn])
continue;
/* average Kbytes per transfer. */
if (cur.dk_rxfer[dn] + cur.dk_wxfer[dn])
mbps = ((cur.dk_rbytes[dn] + cur.dk_wbytes[dn]) /
(1024.0)) / (cur.dk_rxfer[dn] + cur.dk_wxfer[dn]);
else
mbps = 0.0;
(void)printf(" %5.2f", mbps);
/* average transfers per second. */
(void)printf(" %3.0f",
(cur.dk_rxfer[dn] + cur.dk_wxfer[dn]) / etime);
/* time busy in disk activity */
atime = (double)cur.dk_time[dn].tv_sec +
((double)cur.dk_time[dn].tv_usec / (double)1000000);
/* Megabytes per second. */
if (atime != 0.0)
mbps = (cur.dk_rbytes[dn] + cur.dk_wbytes[dn]) /
(double)(1024 * 1024);
else
mbps = 0;
(void)printf(" %4.2f ", mbps / etime);
}
}
static void
disk_stats2(double etime)
{
int dn;
double atime;
for (dn = 0; dn < dk_ndrive; ++dn) {
if (!cur.dk_select[dn])
continue;
/* average kbytes per second. */
(void)printf(" %4.0f",
(cur.dk_rbytes[dn] + cur.dk_wbytes[dn]) / (1024.0) / etime);
/* average transfers per second. */
(void)printf(" %3.0f",
(cur.dk_rxfer[dn] + cur.dk_wxfer[dn]) / etime);
/* average time busy in disk activity. */
atime = (double)cur.dk_time[dn].tv_sec +
((double)cur.dk_time[dn].tv_usec / (double)1000000);
(void)printf(" %4.2f ", atime / etime);
}
}
static void
cpustats(void)
{
int state;
double t = 0;
for (state = 0; state < CPUSTATES; ++state)
t += cur.cp_time[state];
if (!t)
t = 1.0;
/* States are generally never 100% and can use %3.0f. */
for (state = 0; state < CPUSTATES; ++state)
printf("%3.0f", 100. * cur.cp_time[state] / t);
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: iostat [-CDdIT] [-c count] [-M core] [-N system] [-w wait] [drives]\n");
exit(1);
}
static void
display(void)
{
int i;
double etime;
/* Sum up the elapsed ticks. */
etime = 0.0;
for (i = 0; i < CPUSTATES; i++) {
etime += cur.cp_time[i];
}
if (etime == 0.0)
etime = 1.0;
/* Convert to seconds. */
etime /= (float)hz;
/* If we're showing totals only, then don't divide by the
* system time.
*/
if (ISSET(todo, SHOW_TOTALS))
etime = 1.0;
if (ISSET(todo, SHOW_TTY))
printf("%4.0f %4.0f", cur.tk_nin / etime, cur.tk_nout / etime);
if (ISSET(todo, SHOW_STATS_1))
disk_stats(etime);
if (ISSET(todo, SHOW_STATS_2))
disk_stats2(etime);
if (ISSET(todo, SHOW_CPU))
cpustats();
(void)printf("\n");
(void)fflush(stdout);
}
static void
selectdrives(char *argv[])
{
int i, ndrives;
/*
* Choose drives to be displayed. Priority goes to (in order) drives
* supplied as arguments and default drives. If everything isn't
* filled in and there are drives not taken care of, display the first
* few that fit.
*
* The backward compatibility #ifdefs permit the syntax:
* iostat [ drives ] [ interval [ count ] ]
*/
#define BACKWARD_COMPATIBILITY
for (ndrives = 0; *argv; ++argv) {
#ifdef BACKWARD_COMPATIBILITY
if (isdigit(**argv))
break;
#endif
for (i = 0; i < dk_ndrive; i++) {
if (strcmp(cur.dk_name[i], *argv))
continue;
cur.dk_select[i] = 1;
++ndrives;
}
}
#ifdef BACKWARD_COMPATIBILITY
if (*argv) {
interval = atoi(*argv);
if (*++argv)
reps = atoi(*argv);
}
#endif
if (interval) {
if (!reps)
reps = -1;
} else
if (reps)
interval = 1;
/* Pick up to 4 drives if none specified. */
if (ndrives == 0)
for (i = 0; i < dk_ndrive && ndrives < 4; i++) {
if (cur.dk_select[i])
continue;
cur.dk_select[i] = 1;
++ndrives;
}
}